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Sample records for canaries serinus canaria

  1. Amplitude modulation of sexy phrases is salient for song attractiveness in female canaries (Serinus canaria).

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    Pasteau, Magali; Ung, Davy; Kreutzer, Michel; Aubin, Thierry

    2012-07-01

    Song discrimination and recognition in songbird species have usually been studied by measuring responses to song playbacks. In female canaries, Serinus canaria, copulation solicitation displays (CSDs) are used as an index of female preferences, which are related to song recognition. Despite the fact that many studies underline the role of song syntax in this species, we observed that short segments of songs (a few seconds long) are enough for females to discriminate between conspecific and heterospecific songs, whereas such a short duration is not sufficient to identify the syntax rules. This suggests that other cues are salient for song recognition. In this experiment, we investigated the influence of amplitude modulation (AM) on the responses (CSDs) of female canaries to song playbacks. We used two groups of females: (1) raised in acoustic isolation and (2) raised in normal conditions. When adult, we tested their preferences for sexy phrases with different AMs. We broadcast three types of stimuli: (1) songs with natural canary AM, (2) songs with AM removed, or (3) song with wren Troglodytes troglodytes AM. Results indicate that female canaries prefer and have predispositions for a song type with the natural canary AM. Thus, this acoustic parameter is a salient cue for song attractiveness. PMID:22476242

  2. Identification and antimicrobial resistance of members from the Enterobacteriaceae family isolated from canaries (Serinus canaria

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    Ruben V. Horn

    2015-06-01

    Full Text Available Abstract: The Enterobacteriaceae family contains potentially zoonotic bacteria, and their presence in canaries is often reported, though the current status of these in bird flocks is unknown. Therefore, this study aimed to identify the most common genera of enterobacteria from canaries (Serinus canaria and their antimicrobial resistance profiles. From February to June of 2013, a total of 387 cloacal swab samples from eight domiciliary breeding locations of Fortaleza city, Brazil, were collected and 58 necropsies were performed in canaries, which belonged to the Laboratory of Ornithological Studies. The samples were submitted to microbiological procedure using buffered peptone water and MacConkey agar. Colonies were selected according to their morphological characteristics on selective agar and submitted for biochemical identification and antimicrobial susceptibility. A total of 61 isolates were obtained, of which 42 were from cloacal swabs and 19 from necropsies. The most isolated bacteria was Escherichia coli with twenty five strains, followed by fourteen Klebsiellaspp., twelve Enterobacterspp., seven Pantoea agglomerans, two Serratiaspp. and one Proteus mirabilis. The antimicrobial to which the strains presented most resistance was sulfonamides with 55.7%, followed by ampicillin with 54.1% and tetracycline with 39.3%. The total of multidrug-resistant bacteria (MDR was 34 (55.7%. In conclusion, canaries harbor members of the Enterobacteriaceae family and common strains present a high antimicrobial resistance rate, with a high frequency of MDR bacteria.

  3. Female signalling to male song in the domestic canary, Serinus canaria.

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    Amy, Mathieu; Salvin, Pauline; Naguib, Marc; Leboucher, Gerard

    2015-01-01

    Most studies on sexual selection focus on male characteristics such as male song in songbirds. Yet female vocalizations in songbirds are growing in interest among behavioural and evolutionary biologists because these vocalizations can reveal the female's preferences for male traits and may affect male display. This study was designed to test whether male song performance influences the different female signals in the domestic canary (Serinus canaria). Female canaries were exposed to three types of song performance, differing in the repetition rate of sexy syllables. This experiment demonstrates that female birds are engaged in multimodal communication during sexual interaction. The results support the copulation solicitation hypothesis for female-specific trills: these trills were positively correlated and had a similar pattern to the copulation solicitation displays; responses were higher to the songs with higher performance and responses decreased with the repetition of the stimulation. Also, we observed a sensitization effect with the repetition of the song of the highest performance for the simple calls. Simple trills and other calls were more frequent during the broadcast of canary songs compared with the heterospecific control songs. The differential use of female signals in response to different song performance reveals a highly differentiated female signalling system which is discussed in light of the role of female traits to understand sexual selection in a broader perspective. PMID:26064577

  4. Multisensory non-photoperiodic cue advances the onset of seasonal breeding in Island canaries (Serinus canaria).

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    Voigt, Cornelia; Meiners, Torsten; Ter Maat, Andries; Leitner, Stefan

    2011-10-01

    In most temperate zone vertebrates, photoperiodic change plays the major role in the timing of seasonal breeding. However, direct environmental stimuli such as temperature, rainfall, or availability of food are thought to be important for fine-tuning breeding activities. Building on evidence from wild Island canaries (Serinus canaria), the authors had shown advancing effects of green vegetation on breeding under captive, short-day conditions. So far, the precise, sensory modalities of this stimulatory cue are unknown. Here the authors present new data that confirm advanced breeding activities in the presence of green vegetation and narrow its stimulatory components. They found that direct exposure of the birds to fresh green vegetation represented the strongest stimulus and advanced breeding by up to 2 months compared to controls. In contrast, access to artificial green vegetation, extracts from green vegetation, or olfactory components alone had no such effects. This is, to the best of the authors' knowledge, the first experiment that examines sensory components of an effective, supplementary, non-photoperiodic cue in a temperate zone species. The data suggest that in order to use non-photoperiodic information to time breeding, birds must be able to integrate and process multisensory stimuli. Single non-photoperiodic sensory cues are insufficient to affect the timing of seasonal breeding. PMID:21921297

  5. Modulation by steroid hormones of a ''sexy'' acoustic signal in an Oscine species, the Common Canary Serinus canaria

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    Fanny Rybak

    2004-06-01

    Full Text Available The respective influence of testosterone and estradiol on the structure of the Common Canary Serinus canaria song was studied by experimentally controlling blood levels of steroid hormones in males and analyzing the consequent effects on acoustic parameters. A detailed acoustic analysis of the songs produced before and after hormonal manipulation revealed that testosterone and estradiol seem to control distinct song parameters independently. The presence of receptors for testosterone and estradiol in the brain neural pathway controlling song production strongly suggests that the observed effects are mediated by a steroid action at the neuronal level.A influência da testosterona e do estradiol, respectivamente, na estrutura do canto do Canário-do-reino Serinus canaria foi estudada analisando o efeito da manipulação dos níveis sanguíneos de hormônios esteróides em machos nos parâmetros acústicos do canto. Uma analise detalhada dos cantos produzidos antes e depois da manipulação hormonal revelou que testosterona e estradiol parecem controlar independentemente parâmetros acústicos distintos. A presença de receptores para esses hormônios no circuito neuronal para controle da produção do canto sugere fortemente que os efeitos observados são mediados pela ação de esteróides a nivel neuronal.

  6. No contact transmission of avian bornavirus in experimentally infected cockatiels (Nymphicus hollandicus) and domestic canaries (Serinus canaria forma domestica).

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    Rubbenstroth, Dennis; Brosinski, Katrin; Rinder, Monika; Olbert, Marita; Kaspers, Bernd; Korbel, Rüdiger; Staeheli, Peter

    2014-08-01

    Avian bornaviruses (ABV) are the causative agents of proventricular dilatation disease (PDD), a widely distributed disease of parrots. Distinct ABV lineages were also found in various non-psittacine avian species, such as canaries, but the pathogenic role of ABV in these species is less clear. Despite the wide distribution of ABV in captive parrots and canaries, its mode of transmission is poorly understood: both horizontal transmission via the urofaecal-oral route and vertical transmission are discussed to play a role. In this study we investigated pathology and horizontal transmission of ABV in domestic canaries (Serinus canaria forma domestica) and cockatiels (Nymphicus hollandicus), two natural host species commonly used for experimental ABV infections. ABV inoculation resulted in persistent infection of all inoculated animals from both species. ABV-infected cockatiels exhibited PDD-like symptoms, such as neurologic signs or shedding of undigested seeds. In contrast, infected domestic canaries did not develop clinical disease. Interestingly, we did not detect viral RNA in cloacal swabs and organ samples or ABV-specific antibodies in serum samples of contact-exposed sentinel birds from either species at any time during a four months observation period. Our results strongly indicate that horizontal transmission of ABV by direct contact is inefficient in immunocompetent fully fledged domestic canaries and cockatiels. PMID:24933163

  7. Social transmission of food handling in the context of triadic interactions between adults and young canaries (Serinus canaria)

    OpenAIRE

    Cadieu, Nicole; Winterton, P.; Cadieu, J.C.

    2008-01-01

    International audience We studied the factors that enhance food recognition and consumption in young canaries when confronted with adults. In contrast to previous studies on canaries in which social transmission of food habits was studied in the context of dyadic interactions (one juvenile – one adult), we proposed a more realistic framework in which young canaries were studied in the context of triadic interactions, free or not, with adults of both sexes. We found that during free interac...

  8. Cutaneous myxoma in a pintagol (Sporagra magellanica X Serinus canaria

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    Guilherme Reis Blume

    2015-09-01

    Full Text Available Myxomas are benign mesenchymal tumors rarely described in birds. This report describes the clinical and pathological findings in a case of myxoma in a pintagol (Sporagra magellanicaX Serinus canaria. The animal had a nodule on the dorsal region of the third digit on the left hindlimb. Grossly, it was a 0.9×0.5×0.4cm, soft, white nodule, with black and yellow areas on the cut surface. Microscopically, a well-differentiated monomorphic population of spindle cells arranged in an abundant Alcian blue-positive myxoid matrix was observed. The diagnosis of myxoma was based on the microscopic findings

  9. Estimating Natural Recharge by Means of Chloride Mass Balance in a Volcanic Aquifer: Northeastern Gran Canaria (Canary Islands, Spain)

    OpenAIRE

    Gema Naranjo; Tatiana Cruz-Fuentes; María del Carmen Cabrera; Emilio Custodio

    2015-01-01

    The chloride mass balance method was used to estimate the average diffuse groundwater recharge on northeastern Gran Canaria (Canary Islands), where the largest recharge to the volcanic island aquifer occurs. Rainwater was sampled monthly in ten rainwater collectors to determine the bulk deposition rate of chloride for the 2008-2014 period. Average chloride deposition decreases inwardly from more than 10 g center dot m(-2)center dot year(-1) to about 4 g center dot m(-2)center dot year(-1). Th...

  10. 3D modelling of the Tejeda Caldera cone-sheet swarm, Gran Canaria, Canary Islands, Spain

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    Samrock, Lisa K.; Jensen, Max J.; Burchardt, Steffi; Troll, Valentin R.; Mattsson, Tobias; Geiger, Harri

    2015-04-01

    Cone-sheet swarms provide vital information on the interior of volcanic systems and their plumbing systems (e.g. Burchardt et al. 2013). This information is important for the interpretation of processes and dynamics of modern and ancient volcanic systems, and is therefore vital for assessing volcanic hazards and to reduce risks to modern society. To more realistically model cone-sheet emplacement an approximation of their 3D shape needs to be known. Most cone-sheet swarms are not sufficiently exposed laterally and/or vertically, however, which makes it difficult to determine the geometry of a cone-sheet swarm at depth, especially since different shapes (e.g. convex, straight or concave continuations) would produce a similar trace at the surface (cf. Burchardt et al. 2011, and references therein). The Miocene Tejeda Caldera on Gran Canaria, Canary Islands, Spain, hosts a cone-sheet swarm that was emplaced into volcaniclastic caldera infill at about 12.3-7.3 Ma (Schirnick et al. 1999). The dyke swarm displays over 1000 m of vertical exposure and more than 15 km of horizontal exposure, making it a superb locality to study the evolution of cone-sheet swarms in detail and to determine its actual geometry in 3D space. We have used structural data of Schirnick (1996) to model the geometry of the Tejeda cone-sheet in 3D, using the software Move® by Midland Valley Ltd. Based on previous 2D projections, Schirnick et al. (1999) suggested that the cone-sheet swarm is formed by a stack of parallel intrusive sheets which have a truncated dome geometry and form a concentric structure around a central axis, assuming straight sheet-intrusions. Our 3D model gives insight into the symmetries of the sheets and the overall geometry of the cone-sheet swarm below the surface. This visualization now allows to grasp the complexity of the Tejeda cone-sheet swarm at depth, particularly in relation to different possible cone-sheet geometries suggested in the literature (cf. Burchardt et al

  11. New xenophytes from Gran Canaria (Canary Islands, Spain, with emphasis on naturalized and (potentially invasive species

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    Verloove, F.

    2013-12-01

    Full Text Available Trabajos recientes de campo en Gran Canaria han facilitado el descubrimiento de nuevas localidades para plantas vasculares no nativas. Agave attenuata, Antigonon leptopus, Atriplex nummularia, Cascabela thevetia, Cenchrus echinatus, Cuscuta campestris, Diplachne fusca subsp. uninervia, Diplotaxis tenuifolia, Dysphania anthelmintica (hasta ahora confundida con D. ambrosioides, Eclipta prostrata, Euphorbia pulcherrima, Fagopyrum esculentum, Gossypium barbadense, Lablab purpureus, Lemna minuta, Opuntia leucotricha, Passiflora edulis, Pennisetum glaucum, Phaseolus acutifolius, Pluchea carolinensis, Prosopis juliflora, Salvia microphylla, Schinus terebinthifolius, Senna spectabilis, Solanum chrysotrichum, Tecoma stans, Tipuana tipu, Urochloa mutica, U. plantaginea y Washingtonia se citan por primera vez para las Islas Canarias, mientras que Alopecurus myosuroides, Amaranthus blitoides, Bothriochloa ischaemum var. songarica, Cardamine flexuosa subsp. debilis, Heliotropium curassavicum, Leonotis nepetifolia, Medicago lupulina, Parkinsonia aculeata, Physalis peruviana, Phytolacca americana y Turnera ulmifolia son nuevas para la flora de la isla de Gran Canaria. Finalmente, se confirma la presencia de Paspalum vaginatum, P. distichum y Cortaderia selloana en Gran Canaria.Trabajos recientes de campo en Gran Canaria han facilitado el descubrimiento de nuevas localidades para plantas vasculares no nativas. Agave attenuata, Antigonon leptopus, Atriplex nummularia, Cascabela thevetia, Cenchrus echinatus, Cuscuta campestris, Diplachne fusca subsp. uninervia, Diplotaxis tenuifolia, Dysphania anthelmintica (hasta ahora confundida con D. ambrosioides, Eclipta prostrata, Euphorbia pulcherrima, Fagopyrum esculentum, Gossypium barbadense, Lablab purpureus, Lemna minuta, Opuntia leucotricha, Passiflora edulis, Pennisetum glaucum, Phaseolus acutifolius, Pluchea carolinensis, Prosopis juliflora, Salvia microphylla, Schinus terebinthifolius, Senna spectabilis, Solanum

  12. Groundwater flow in a volcanic-sedimentary coastal aquifer: Telde area, Gran Canaria, Canary Islands, Spain

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    Cabrera, M. C.; Custodio, E.

    Groundwater conditions in a 75- km2 coastal area around the town of Telde in eastern Gran Canaria island have been studied. Pliocene to Recent volcanic materials are found, with an intercalated detrital formation (LPDF), which is a characteristic of the area. Groundwater development has become intensive since the 1950s, mostly for intensive agricultural irrigation and municipal water supply. The LPDF is one order of magnitude more transmissive and permeable than the underlying Phonolitic Formation when median values are compared (150 and 15 m2 day-1 5 and 0.5 m day-1, respectively). These two formations are highly heterogeneous and the ranges of expected well productivities partly overlap. The overlying recent basalts constituted a good aquifer several decades ago but now are mostly drained, except in the southern areas. Average values of drainable porosity (specific yield) seem to be about 0.03 to 0.04, or higher. Groundwater development has produced a conspicuous strip where the watertable has been drawn down as much as 40 m in 20 years, although the inland watertable elevation is much less affected. Groundwater reserve depletion contributes only about 5% of ed water, and more than 60% of this is transmitted from inland areas. Groundwater discharge into the sea may still be significant, perhaps 30% of total inflow to the area is discharged to the sea although this value is very uncertain. Les conditions de gisement de l'eau souterraine d'une région de 75 km2 de la côte Est de l'île de la Grande Canarie (archipel des Canaries), dans le secteur de Telde, ont été étudiées, en utilisant seulement les données fournies par les puits d'exploitation existants. Les matériaux volcaniques, d'âge Pliocène à sub-actuel, sont séparés par une formation détritique (FDLP), qui constitue la principale singularité de cette région. L'exploitation de l'eau souterraine est devenue intensive à partir de 1950, principalement pour des besoins d'irrigation (agriculture

  13. New xenophytes from Gran Canaria (Canary Islands, Spain), with emphasis on naturalized and (potentially) invasive species

    OpenAIRE

    Verloove, F

    2013-01-01

    Trabajos recientes de campo en Gran Canaria han facilitado el descubrimiento de nuevas localidades para plantas vasculares no nativas. Agave attenuata, Antigonon leptopus, Atriplex nummularia, Cascabela thevetia, Cenchrus echinatus, Cuscuta campestris, Diplachne fusca subsp. uninervia, Diplotaxis tenuifolia, Dysphania anthelmintica (hasta ahora confundida con D. ambrosioides), Eclipta prostrata, Euphorbia pulcherrima, Fagopyrum esculentum, Gossypium barbadense, Lablab purpureus, Lemna minuta,...

  14. Estimating Natural Recharge by Means of Chloride Mass Balance in a Volcanic Aquifer: Northeastern Gran Canaria (Canary Islands, Spain

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    Gema Naranjo

    2015-05-01

    Full Text Available The chloride mass balance method was used to estimate the average diffuse groundwater recharge on northeastern Gran Canaria (Canary Islands, where the largest recharge to the volcanic island aquifer occurs. Rainwater was sampled monthly in ten rainwater collectors to determine the bulk deposition rate of chloride for the 2008–2014 period. Average chloride deposition decreases inwardly from more than 10 g·m−2·year−1 to about 4 g·m−2·year−1. The application of the chloride mass balance method resulted in an estimated average recharge of about 28 hm3/year or 92 mm/year (24% of precipitation in the study area after subtracting chloride loss with surface runoff. The average storm runoff was estimated to be 12 hm3/year (9% of precipitation for the 1980–2014 period. Runoff was sampled during scarce rainy periods, which produce surface water flow. Average recharge varies from less than a few mm/year near the coast up to 270 mm/year in the highlands (about 33% of average rainfall, with a close-to-linear increase inwardly of about 18 mm·year−1·km−1. Recharge rate uncertainty corresponds to an estimated CV of 0.3–0.4 because of the short data series available.

  15. Contrasting recruitment seasonality of sea urchin species in Gran Canaria, Canary Islands (eastern Atlantic

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    S. GARCIA-SANZ

    2014-09-01

    Full Text Available Despite sea-urchins can play an important role affecting the community structure of subtidal bottoms, factors controlling the dynamics of sea-urchin populations are still poorly understood. We assessed the seasonal variation in recruitment of three sea-urchin species (Diadema africanum, Paracentrotus lividus and Arbacia lixula at Gran Canaria Island (eastern Atlantic via monthly deployment of artificial collectors throughout an entire annual cycle on each of four adjacent habitat patches (seagrasses, sandy patches, ‘urchin-grazed’ barrens and macroalgal-dominated beds within a shallow coastal landscape. Paracentrotus lividus and A. lixula had exclusively one main recruitment peak in late winter-spring. Diadema africanum recruitment was also seasonal, but recruits appeared in late summer-autumn, particularly on ‘urchin-grazed’ barrens with large abundances of adult conspecifics. In conclusion, this study has demonstrated non-overlapping seasonal recruitment patterns of the less abundant species (P. lividus and A. lixula with the most conspicuous species (D. africanum in the study area.

  16. Reconstructing eroded paleovolcanoes on Gran Canaria, Canary Islands, using advanced geomorphometry

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    Karátson, D.; Yepes, J.; Favalli, M.; Rodríguez-Peces, M. J.; Fornaciai, A.

    2016-01-01

    Original volcanic edifices of two successive stages of Gran Canaria are reconstructed using a geomorphometric analysis of existent or restored paleosurfaces. In the reconstruction, surface fitting was applied preferably to planèzes (i.e. triangular facets of original volcano flanks) and quasi-planar surfaces, QPS (those occurring on planèzes, or scattered, slightly eroded portions derived from original cone surfaces) with the help of red relief image map (RRIM) analysis. Out of the long-lasting, Mid-Miocene to Holocene subaerial evolution of the island, the Late Miocene Fataga volcano and the subsequent, Pliocene Roque Nublo volcanoes were the largest and highest. The eruptive center of Fataga, a composite edifice (12.2-8.8 Ma) that may have grown up excentrically with respect to the previous Tejeda caldera, is well-defined by both two planèzes (named Veneguera-Mogán and Fataga-Tirajana) and QPS remnants. Its calculated original volume, ≤ 1000 km3, is close to the largest stratovolcanoes on Earth. However, its ≥ 3300 m elevation, obtained by exponential fit, may have been significantly lower due to the complex architecture of the summit region, e.g. a caldera responsible for ignimbrite eruptions. Roque Nublo, a 3.7-2.9 Ma stratovolcanic cone, which was superimposed upon the Fataga rocks ≥ 3 km west of the Fataga center, has left no considerable paleosurfaces behind due to heavy postvolcanic erosion. Yet, its remnant formations preserved in a radial pattern unambiguously define its center. Moreover, surface fitting of the outcropping rocks can be corrected taking the erosion rate for the past 3 Ma into account. Such a corrected surface fit points to a regular-shaped, ≥ 3000 m-high cone with a 25 km radius and ca. 940 km3 original volume, also comparable with the dimensions of the largest terrestrial stratovolcanoes.

  17. Long-term aerosol measurements in Gran Canaria, Canary Islands: Particle concentration, sources and elemental composition

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    Gelado-Caballero, MaríA. D.; López-GarcíA, Patricia; Prieto, Sandra; Patey, Matthew D.; Collado, Cayetano; HéRnáNdez-Brito, José J.

    2012-02-01

    There are very few sets of long-term measurements of aerosol concentrations over the North Atlantic Ocean, yet such data is invaluable in quantifying atmospheric dust inputs to this ocean region. We present an 8-year record of total suspended particles (TSP) collected at three stations on Gran Canaria Island, Spain (Taliarte at sea level, Tafira 269 m above sea level (a.s.l.) and Pico de la Gorra 1930 m a.s.l.). Using wet and dry deposition measurements, the mean dust flux was calculated at 42.3 mg m-2 d-1. Air mass back trajectories (HYSPLIT, NOAA) suggested that the Sahara desert is the major source of African dust (dominant during 32-50% of days), while the Sahel desert was the major source only 2-10% of the time (maximum in summer). Elemental composition ratios of African samples indicate that, despite the homogeneity of the dust in collected samples, some signatures of the bedrocks can still be detected. Differences were found for the Sahel, Central Sahara and North of Sahara regions in Ti/Al, Mg/Al and Ca/Al ratios, respectively. Elements often associated with pollution (Pb, Cd, Ni, Zn) appeared to share a common origin, while Cu may have a predominantly local source, as suggested by a decrease in the enrichment factor (EF) of Cu during dust events. The inter-annual variability of dust concentrations is investigated in this work. During winter, African dust concentration measurements at the Pico de la Gorra station were found to correlate with the North Atlantic Oscillation (NAO) index.

  18. Wind Power adapted to load hollow in the Canary Islands; Adaptacion de Eolicos a huecos de tension en Canarias-2015

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Velazquez, A.

    2008-07-01

    This article is intended to analyse and point out the benefits that could be reached for the Canary Islands electrical systems in relation to wind technology adaptation (actual and future) to the voltage hollow, as required by the Canary Islands Government Directive 1541, dated November 15th 2006. This subject is of vital importance due to the increasing volume of wind power plants foreseen in the Energy Plan for the Canary Islands 2006 (PECAN), who will turn the Canary Islands into a pilot system in relation to wind power integration within an isolated system. (Author)

  19. Degradation of Cymodocea nodosa (Ucria) Ascherson meadow at Las Canteras Beach (Gran Canaria, Canary Islands, Atlantic Ocean)

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    Milena Polifrone; Miquel Rosell-Fieschi

    2014-01-01

    Objective: To monitor the distribution of Cymodocea nodosa (Ucria) Ascherson in Las Canteras Beach (Las Palmas de Gran Canaria, Spain), comparing the status in 2005 with the distribution observed in 1985 and 1995. Methods: Field observations by selfcontained underwater breathing apparatus diving records and cartographic report.Results:rocks, which sheltered it from the strong north-east winds and swells. Since 1985 a gradual reduction of its extent has been observed and more than 80% of the original canopy disappeared in twenty years time, mostly due to the anthropogenic impact and modification of the sedimentary dynamics of the beach.Conclusions:Conclusions: The degradation of this seagrass meadow determinates the loss of the only meadow in the north of the island of Gran Canaria and the absence of a management plan for its conservation.

  20. Análisis geográfico de las actuales relaciones comerciales entre Canarias y Marruecos / Geographic analysis of commercial relations between the Canary Islands and Morocco

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    Ramón Díaz Hernández

    2014-12-01

    Full Text Available En este trabajo formulamos como hipótesis de partida que Canarias, como frontera meridional de Europa, en un contexto de creciente internacionalización, tiene en los mercados africanos una gran baza histórica que desempeñar. Dado el interés general que este asunto suscita entre las ciencias sociales, se requiere abordarlo desde el análisis geográfico. Para cumplimentar este estudio se emplearon las estadísticas que ofrecen organismos oficiales como el Instituto Nacional de Estadística, Instituto Canario de Estadística, Agencia Estatal de la Administración Tributaria, Instituto de Comercio Exterior y entidades internacionales como la Conferencia de las Naciones Unidas para el Comercio y el Desarrollo (UNCTAD y la Organización Mundial del Comercio (OCM.In this work we formulate the hypothesis that the Canary Islands, as Europe’s southern border, must develop an important role in African markets, in a context of increasing internationalization. Because of the general interest in this issue within the social sciences, to address it from the geographic analysis is required. This study is based, on the one hand, on statistics provided by Spanish government agencies such as the National Statistics Institute, the Canary Institute of Statistics, the State Tax Administration Agency and the Institute of Foreign Trade and, on the other hand, by international entities such as the United Nations Conference for Trade and Development (UNCTAD and the World Trade Organization (WTO.

  1. Groundwater intensive exploitation and mining in Gran Canaria and Tenerife, Canary Islands, Spain: Hydrogeological, environmental, economic and social aspects.

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    Custodio, Emilio; Cabrera, María Del Carmen; Poncela, Roberto; Puga, Luis-Olavo; Skupien, Elzbieta; Del Villar, Alberto

    2016-07-01

    Intensive exploitation and continuous consumption of groundwater reserves (groundwater mining) have been real facts for decades in arid and semiarid areas. A summary of experience in the hydrogeological, economic, social and ethical consequences of groundwater intensive and mining exploitation in Gran Canaria and Tenerife Islands, in the Canarian Archipelago, is presented. Groundwater abstraction is less than recharge, but a significant outflow of groundwater to the sea cannot be avoided, especially in Tenerife, due to its younger volcanic coastal formations. Consequently, the intensive aquifer groundwater development by means of wells and water galleries (tunnels) has produced a groundwater reserve depletion of about 2km(3). Should current groundwater abstraction cease, the recovery time to close-to-natural conditions is from decades to one century, except in the mid and high elevations of Tenerife, where this recovery is not possible as aquifer formations will remain permanently drained by the numerous long water galleries. The socio-economic circumstances are complex due to a long standing history of water resources exploitation, successive social changes on each island, and well-established groundwater water trading, with complex relationships that affect water governance and the resulting ethical concerns. Gran Canaria and Tenerife are in an advanced groundwater exploitation stage and have a large water demand. They are good examples that allow drawing guidelines to evaluate groundwater development on other small high islands. After presenting the hydrogeological background, the socio-economic results are discussed to derive general knowledge to guide on water governance.

  2. Groundwater intensive exploitation and mining in Gran Canaria and Tenerife, Canary Islands, Spain: Hydrogeological, environmental, economic and social aspects.

    Science.gov (United States)

    Custodio, Emilio; Cabrera, María Del Carmen; Poncela, Roberto; Puga, Luis-Olavo; Skupien, Elzbieta; Del Villar, Alberto

    2016-07-01

    Intensive exploitation and continuous consumption of groundwater reserves (groundwater mining) have been real facts for decades in arid and semiarid areas. A summary of experience in the hydrogeological, economic, social and ethical consequences of groundwater intensive and mining exploitation in Gran Canaria and Tenerife Islands, in the Canarian Archipelago, is presented. Groundwater abstraction is less than recharge, but a significant outflow of groundwater to the sea cannot be avoided, especially in Tenerife, due to its younger volcanic coastal formations. Consequently, the intensive aquifer groundwater development by means of wells and water galleries (tunnels) has produced a groundwater reserve depletion of about 2km(3). Should current groundwater abstraction cease, the recovery time to close-to-natural conditions is from decades to one century, except in the mid and high elevations of Tenerife, where this recovery is not possible as aquifer formations will remain permanently drained by the numerous long water galleries. The socio-economic circumstances are complex due to a long standing history of water resources exploitation, successive social changes on each island, and well-established groundwater water trading, with complex relationships that affect water governance and the resulting ethical concerns. Gran Canaria and Tenerife are in an advanced groundwater exploitation stage and have a large water demand. They are good examples that allow drawing guidelines to evaluate groundwater development on other small high islands. After presenting the hydrogeological background, the socio-economic results are discussed to derive general knowledge to guide on water governance. PMID:27017075

  3. Canary literature and culture in the reign of Carlos IV (1788-1808 La literatura y la cultura canaria durante el reinado de Carlos IV (1788-1808

    Directory of Open Access Journals (Sweden)

    Victoria GALVÁN GONZÁLEZ

    2012-01-01

    Full Text Available This work wants to offer a short view of the literature and culture developed in the Canary Isles during the reign period of Charles IV, from a general point of view. Therefore, I cannot offer a detailed perspective of each of the aspects dealt with. This way, what is tackled in this work is a revision of the socio-cultural activities connected to the gatherings or to the economic societies, the educative circumstances, the activity developed by the bishops with the carrying out of facilities or with a reforming teaching at the reading level, such as Tavira, the production of books with an allusion to the printing activity, the most developed literary genres and their authors, the topic preference in poetry —majority genre—, in prose and in theatre, and an allusion to some of the private libraries.Este trabajo quiere ofrecer un panorama sintético de la literatura y la cultura desarrollada en Canarias durante el reinado de Carlos IV, atendiendo a sus trazos generales. No puede ofrecer, por tanto, una atención detenida de cada uno de los aspectos abordados. Así se hace una revisión de las actividades socioculturales ligadas a las tertulias o a las sociedades económicas, las circunstancias educativas, la actividad desplegada por los obispos con la realización de infraestructuras o con un magisterio reformista en el plano de las lecturas, como Tavira, la producción de libros con alusión a la actividad impresora, los géneros literarios más cultivados y sus autores, las preferencias temáticas en poesía —género mayoritario—, en prosa y en teatro, y alusión a algunas de las bibliotecas particulares.

  4. Screening of emerging contaminants and priority substances (2008/105/EC) in reclaimed water for irrigation and groundwater in a volcanic aquifer (Gran Canaria, Canary Islands, Spain).

    Science.gov (United States)

    Estévez, Esmeralda; Cabrera, María del Carmen; Molina-Díaz, Antonio; Robles-Molina, José; Palacios-Díaz, María del Pino

    2012-09-01

    In semiarid regions, reclaimed water can be an important source of emerging pollutants in groundwater. In Gran Canaria Island, reclaimed water irrigation has been practiced for over thirty years and currently represents 8% of water resources. The aim of this study was to monitor contaminants of emerging concern and priority substances (2008/105/EC) in a volcanic aquifer in the NE of Gran Canaria where the Bandama Golf Course has been sprinkled with reclaimed water since 1976. Reclaimed water and groundwater were monitoring quarterly from July 2009 to May 2010. Only 43% of the 183 pollutants analysed were detected: 42 pharmaceuticals, 20 pesticides, 12 polyaromatic hydrocarbons, 2 volatile organic compounds and 2 flame retardants. The most frequent compounds were caffeine, nicotine, chlorpyrifos ethyl, fluorene, phenanthrene and pyrene. Concentrations were always below 50 ng L(-1), although some pharmaceuticals and one pesticide, cholrpyrifos ethyl, were occasionally detected at higher concentrations. This priority substance for surface water exceeded the maximum threshold (0.1 μg L(-1)) for pesticide concentration in groundwater (2006/118/EC). Sorption and degradation processes in soil account for more compounds being detected in reclaimed water than in groundwater, and that some contaminants were always detected in reclaimed water, but never in groundwater (flufenamic acid, propyphenazone, terbutryn and diazinon). Furthermore, erythromycin was always detected in reclaimed water (exceeding occasionally 0.1 μg L(-1)), and was detected only once in groundwater. In contrast, some compounds (phenylephrine, nifuroxazide and miconazole) never detected in reclaimed water, were always detected in groundwater. This fact and the same concentration range detected for the groups, regardless of the water origin, indicated alternative contaminant sources (septic tanks, agricultural practices and sewerage breaks). The widespread detection of high adsorption potential compounds

  5. Valoración nutricional de trabajadores sanitarios expuestos a turnicidad en Canarias Nutritional evaluation of health shift workers from the Canary Islands

    Directory of Open Access Journals (Sweden)

    M. Jesús Fernández Rodríguez

    2004-10-01

    Full Text Available Objetivo: El trabajo a turnos induce hábitos de vida anómalos, lo cual se asocia al aumento de la morbilidad en los trabajadores. En este estudio se valoró el estado nutricional, los hábitos alimentarios y la actividad física de trabajadores hospitalarios sometidos a turnos. Ámbito: La población de estudio estuvo compuesta por 207 trabajadores con turno fijo de mañana y 210 con turno rotatorio (mañana, tarde y noche seleccionados aleatoriamente entre 2.100 trabajadores. Intervenciones: La ingesta dietética se determinó mediante cuestionario de frecuencia de consumo de alimentos autoadministrado. También se determinaron índice de masa corporal, parámetros lipídicos (colesterol total, colesterol HDL, colesterol LDL y triglicéridos, actividad física, edad y sexo. Resultados: Los trabajadores sometidos a turnicidad mostraron un mayor consumo de ternera, huevos, zumos y pastas. No se encontraron diferencias significativas en cuanto a niveles lipídicos, estado ponderal ni de actividad física entre los trabajos sometidos y no a turnicidad y no. El 62% de los hombres y el 37,2% de las mujeres mostraron sobrecarga ponderal (obesidad y sobrepeso. El 46% de los individuos de la muestra presentaron sedentarismo. Conclusiones: La turnicidad en los trabajadores hospitalarios influye sólo parcialmente en los hábitos alimentarios de dicho colectivo.Objective: Shift workers are known to have increased morbidity associated to wrong habits. In this study we have evaluated the nutritional status, food habits and physical activity in health shift workers. Subjects: 207 permanent morning-shift workers and 210 shift workers (3-shift system were randomized selected from the 2,100 workers of the North Area of the Canary Island Sanitary Health System. Methods: Dietary intake was assessed by a self-registered food frequency questionnaire. We also assessed Body Mass Index, blood lipid levels (total cholesterol, HDL cholesterol, LDL cholesterol and

  6. Bilateral coordination and the motor basis of female preference for sexual signals in canary song.

    Science.gov (United States)

    Suthers, Roderick A; Vallet, Eric; Kreutzer, Michel

    2012-09-01

    The preference of female songbirds for particular traits in the songs of courting males has received considerable attention, but the relationship of preferred traits to male quality is poorly understood. Female domestic canaries (Serinus canaria, Linnaeus) preferentially solicit copulation with males that sing special high repetition rate, wide-band, multi-note syllables, called 'sexy' or A-syllables. Syllables are separated by minibreaths but each note is produced by pulsatile expiration, allowing high repetition rates and long duration phrases. The wide bandwidth is achieved by including two notes produced sequentially on opposite sides of the syrinx, in which the left and right sides are specialized for low or high frequencies, respectively. The emphasis of low frequencies is facilitated by a positive relationship between syllable repetition rate and the bandwidth of the fundamental frequency of notes sung by the left syrinx, such that bandwidth increases with increasing syllable repetition rate. The temporal offset between notes prevents cheating by unilaterally singing a note on the left side with a low fundamental frequency and prominent higher harmonics. The syringeal and respiratory motor patterns by which sexy syllables are produced support the hypothesis that these syllables provide a sensitive vocal-auditory indicator of a male's performance limit for the rapid, precisely coordinated interhemispheric switching, which is essential for many sensory and motor processes involving specialized contributions from each cerebral hemisphere. PMID:22875764

  7. Low-dimensional dynamical model for the diversity of pressure patterns used in canary song

    Science.gov (United States)

    Alonso, Leandro M.; Alliende, Jorge A.; Goller, F.; Mindlin, Gabriel B.

    2009-04-01

    During song production, oscine birds produce large air sac pressure pulses. During those pulses, energy is transferred to labia located at the juncture between the bronchii and the trachea, inducing the high frequency labial oscillations which are responsible for airflow modulations, i.e., the uttered sound. In order to generate diverse syllables, canaries (Serinus canaria) use a set of air sac pressure patterns with characteristic shapes. In this work we show that these different shapes can be approximated by the subharmonic solutions of a forced normal form. This simple model is built from identifying dynamical elements which allow to reproduce the shape of the pressure pattern corresponding to one syllable type. Remarkably, integrating that simple model for other parameters allows to recover the other pressure patterns used during song. Interpreting the diversity of these physiological gestures as subharmonic solutions of a simple nonlinear system allows us to account simultaneously for their morphological features as well as for the syllabic timing and suggests a strategy for the generation of complex motor patterns.

  8. Heaven it's my wife! Male canaries conceal extra-pair courtships but increase aggressions when their mate watches.

    Directory of Open Access Journals (Sweden)

    Davy Ung

    Full Text Available Many animals live in a communication network, an environment where individuals can obtain information about competitors or potential mates by observing interactions between conspecifics. In such an environment, interactants might benefit by changing their signalling behaviour in the presence of an audience. This audience effect seems widespread among species, has been observed during various types of interaction (e.g. intra-sexual vs. inter-sexual interaction and varies according to the social context (e.g. gender, hierarchical or mating status of the audience. However, the way individuals might adapt their signalling behaviour to a combination of these factors remains poorly understood. To address this question, we studied how the presence of an audience affects the behaviour of male domestic canaries Serinus canaria during two types of interactions: (i an extra-pair interaction and (ii a male-male competition for food. Males were observed under three conditions: (a in the absence of audience, (b in the presence of their mate or (c of a familiar female. Our results show that male domestic canaries minutely adapt their courting and agonistic behaviours to a combination of: (i the type of interaction (extra-pair interaction/male-male competition, (ii the social context (mate, familiar female or nobody in audience and (iii the behaviours of both the audience and the interactant. These results highlight the ability of animals to subtly adapt their behaviour to the social environment. This also raises questions about the cognitive foundations and evolution of these processes especially considering that canaries are known neither for having high cognitive abilities nor for being a typical example for the social intelligence hypothesis.

  9. La llegada del offset a la prensa de Canarias: implicaciones en el tratamiento de la imagen The arrival of the offset printing system to the press in the Canary Islands: implications in the image treatment

    Directory of Open Access Journals (Sweden)

    Alberto Ardèvol Abreu

    2011-07-01

    Full Text Available El presente artículo forma parte de un trabajo de investigación más extenso sobre la evolución de la fotografía de prensa en Canarias desde el período 1975-1980 hasta la primera década del siglo XXI. Durante la segunda mitad de la década de 1970 se produjo en el archipiélago, de manera paulatina, la transición del sistema de impresión tipográfica al sistema offset. A través de estas páginas pretendemos analizar la influencia que tuvo en la fotografía de prensa de las islas la llegada de este nuevo sistema de impresión, que mejoró de manera significativa la calidad física de los periódicos del archipiélago. La impresión offset, mucho más limpia que su predecesora tipográfica, se publicitaba en Inglaterra bajo el lema “We don't print on your hand, we print on paper” (no imprimimos en sus manos, imprimimos el papel. Los cambios se llevaron a cabo de forma muy gradual, casi imperceptible en un primer momento, coincidiendo, además, con los años de transición política, y trajeron consigo modificaciones en la serie visual no lingüística (fotografías, dibujos, color..., así como en los restantes elementos del periódico, desde el formato al diseño, pasando incluso por los contenidos. Los resultados obtenidos se basan en el muestreo sistemático de dos de las cabeceras más importantes en aquellos momentos en las islas: El tinerfeño El Día y el vespertino Diario de Las Palmas.This article is part of a more extensive research on the evolution of press photography in the Canary Islands from the period 1975-1980 up to the first decade of the 21st century. In the second half of the 1970s it took place in the archipelago a gradually transition from the typographic printing system to the offset printing system. In these pages we try to analyze the influence that the arrival of this new printing system had in the photography of press of the islands, which improved in a significant way the physical quality of the Canarian

  10. Two new species of the genus Peristenus Foerster (Hymenoptera: Braconidae: Euphorinae) from the Canary Islands

    NARCIS (Netherlands)

    Achterberg, van C.; Guerrero, E.R.

    2003-01-01

    Two new species of the genus Peristenus Foerster (Hymenoptera: Braconidae: Euphorinae) from the Canary Islands are described and illustrated: Peristenus angifemoralis spec. nov. from Tenerife, and P. gloriae spec. nov. from Gran Canaria and Tenerife.

  11. Biometric variation in Spadella cephaloptera on the Canary Islands (Chaetognatha)

    OpenAIRE

    Broerse, Alexandra T.C.

    1993-01-01

    Specimens of Spadella cephaloptera from Tenerife, Gran Canaria and Gomera (Canary Islands) were compared biometrically in regards to morphometric and meristic characters. Variation exists among the populations on the islands as well as between the islands. The populations on Gomera seem more distinct from the populations on Tenerife and Gran Canaria than the two latter are mutually. An apparent decline in the number of adults occurs in July, which is related to a decrease in the number of egg...

  12. Chov kanárů v různých systémech

    OpenAIRE

    Hájková Březinová, Kateřina

    2013-01-01

    This work which is focused on breeding canary trying to capture the evolution of wild species of the genus Serinus to their targeted breeding in captivity. Origin of subspecies Serinus canaria domestica found in Africa, specifically in the Palaearctic Atlantic Islands, the Canary Islands, Azores and Island of Madeira where the original species occurs in the wild. On the mainland the canaries got along with Spaniards who settled the islands. Canary behind the emergence of what is known today i...

  13. The submarine eruption of La Restinga (El Hierro, Canary Islands): October 2011-March 2012; La erupcion submarina de La Restinga en la isla de El Hierro, Canarias: Octubre 2011-Marzo 2012

    Energy Technology Data Exchange (ETDEWEB)

    Perez-Torrado, F. J.; Carracedo, J. C.; Rodriguez-Gonzalez, A.; Soler, V.; Troll, V. R.; Wiesmaier, S.

    2012-11-01

    The first signs of renewed volcanic activity at El Hierro began in July 2011 with the occurrence of abundant, low-magnitude earthquakes. The increasing seismicity culminated on October 10, 2011, with the onset of a submarine eruption about 2 km offshore from La Restinga, the southernmost village on El Hierro. The analysis of seismic and deformation records prior to, and throughout, the eruption allowed the reconstruction of its main phases: 1) ascent of magma and migration of hypo centres from beneath the northern coast (El Golfo) towards the south rift zone, close to La Restinga, probably marking the hydraulic fracturing and the opening of the eruptive conduit; and 2) onset and development of a volcanic eruption indicated by sustained and prolonged harmonic tremor whose intensity varied with time. The features monitored during the eruption include location, depth and morphological evolution of the eruptive source and emission of floating volcanic bombs. These bombs initially showed white, vesiculated cores (originated by partial melting of underlying pre-volcanic sediments upon which the island of El Hierro was constructed) and black basanite rims, and later exclusively hollow basanitic lava balloons. The eruptive products have been matched with a fissural submarine eruption without ever having attained surtseyan explosiveness. The eruption has been active for about five months and ended in March 2012, thus becoming the second longest reported historical eruption in the Canary Islands after the Timanfaya eruption in Lanzarote (1730-1736). This eruption provided the first opportunity in 40 years to manage a volcanic crisis in the Canary Islands and to assess the interpretations and decisions taken, thereby gaining experience for improved management of future volcanic activity. Seismicity and deformation during the eruption were recorded and analysed by the Instituto Geografico Nacional (IGN). Unfortunately, a lack of systematic sampling of erupted pyroclasts and

  14. Biometric variation in Spadella cephaloptera on the Canary Islands (Chaetognatha)

    NARCIS (Netherlands)

    Broerse, Alexandra T.C.

    1993-01-01

    Specimens of Spadella cephaloptera from Tenerife, Gran Canaria and Gomera (Canary Islands) were compared biometrically in regards to morphometric and meristic characters. Variation exists among the populations on the islands as well as between the islands. The populations on Gomera seem more distinc

  15. LA ARQUEOLOGÍA HISTÓRICA EN CANARIAS. EL YACIMIENTO SEPULCRAL DE LA IGLESIA DE NUESTRA SEÑORA DE LA CONCEPCIÓN DE SANTA CRUZ DE TENERIFE (Historical archaeology in the Canaries. The burial site of the church of Our Lady of the Conception in Santa Cruz de Tenerife

    Directory of Open Access Journals (Sweden)

    Matilde Arnay de la Rosa

    2009-09-01

    Full Text Available En este estudio revisamos la situación actual de la Arqueología Histórica en las Islas Canarias, disciplina que, a diferencia de la americana, estaba poco desarrollada en las islas hasta hace unos 20 años. El reciente estudio de yacimientos históricos importantes ha modificado esta situación. Como ejemplo, comentamos algunos resultados derivados de la excavación de la iglesia de Nuestra Señora de la Concepción, en cuyo subsuelo se enterró a la población de Santa Cruz de Tenerife durante siglos. Pese a la pobre preservación de los esqueletos, ha sido posible inferir hábitos dietéticos, estado nutricional, exposición a tóxicos, y realizar estudios de DNA mitocondrial. El material recuperado (cerámica, pipas, crucifijos y adornos varios permite establecer estrechas relaciones con la colonización española del Nuevo Mundo. ENGLISH: This study includes an updated review of the current status of Historical Archaeology in the Canary Islands. Traditionally, in contrast with the situation in America, archaeological activity was devoted to studies on the prehistoric remains of population. In the last 20 years, excavation of some important historical sites has allowed the development of Historical Archaeology. As an example, we comment some results obtained from the excavation of the floor of the church of Our Lady of the Conception, where the deads of Santa Cruz de Tenerife were interred during centuries. Despite the poor preservation of the skeletons, it has been possible to infer dietary habits, toxic exposure, nutritional status and genetic lineages (mitochondrial DNA. Smoking pipes, ceramics and adornments associated with interments show a high similitude with those from colonial sites of the New World.

  16. Deformation in volcanic areas: a numerical approach for their prediction in Teide volcano (Tenerife, Canary Islands); Deformaciones en areas volcanicas: una aproximacin numerica para su prediccion en el volcan Teide (Tenerife, Islas Canarias)

    Energy Technology Data Exchange (ETDEWEB)

    Charco, M.; Galan del Sastre, P.

    2011-07-01

    Active volcanic areas study comprises both, observation of physical changes in the natural media and the interpretation of such changes. Nowadays, the application of spatial geodetic techniques, such as GPS (Global Positioning System) or InSAR (Interferometry with Synthetic Aperture Radar), for deformation understanding in volcanic areas, revolutionizes our view of this geodetic signals. Deformation of the Earth's surface reflects tectonic, magmatic and hydrothermal processes at depth. In this way, the prediction of volcanic deformation through physical modelling provides a link between the observation and depth interior processes that could be crucial for volcanic hazards assessment. In this work, we develop a numerical model for elastic deformation study. The Finite Element Method (FEM) is used for the implementation of the numerical model. FEM allows to take into account different morphology, structural characteristics and the mechanical heterogeneities of the medium. Numerical simulations of deformation in Tenerife (Canary Islands) taking into account different medium hypothesis allow us to conclude that the accuracy of the predictions depends on how well the natural system is described. (Author) 22 refs.

  17. La imagen de sí mismos: Los isleños en la revista "Islas canarias" de La Habana

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    Manuel de PAZ SÁNCHEZ

    2010-02-01

    Full Text Available RESUMEN: La emigración canaria en Cuba presenta diferentes ritmos de evolución y al mismo tiempo unas constantes que la caracterizan y diferencian frente a otras migraciones peninsulares. Desde el análisis de la revista Lslas Canarias de La Habana, órgano de la colonia canaria en Cuba durante varios años, el presente trabajo pretende profundizar en la imagen que los canarios tenían de sí mismos y en algunos aspectos cualitativos y peculiares de la presencia canaria en Cuba. Palabras Clave: Cuba, Canarias, Emigración, Imagen, Percepción. ABSTRACT: Emigration from the Canary Islands to Cuba showed different rhythms of development and at the same time some constant features that characterize and differentiate it from other peninsular emigration. Based on an analysis of the magazine Lslas Canarias of Havana, for several years the voice of the colony from the Canary Islands living in Cuba, this article endeavors to examine the image they had of themselves as well as some of the qualitative and peculiar aspects of their presence in Cuba. Key words: Cuba, Canary Islands, Emigrations, Image, Perception.

  18. En la población Canaria, la función de Framingham estima mejor el riesgo de mortalidad cardiovascular que la función SCORE Framingham function estimates the risk of cardio vascular mortality more effectively than SCORE function in the population of the Canary Islands (Spain

    Directory of Open Access Journals (Sweden)

    Antonio Cabrera de León

    2009-06-01

    Full Text Available Objetivos: Comparar la estimación de eventos cardiovasculares fatales con las funciones de Framingham y SCORE, además de explorar su capacidad para detectar el riesgo aportado por factores no incluidos en sus ecuaciones: sedentarismo, obesidad, perímetro abdominal, razón abdomen/estatura, razón abdomen/pelvis y consumo excesivo de alcohol. Métodos: Estudio transversal de 5.289 personas, de 30 a 69 años de edad, obtenidas por muestreo aleatorio en la población general de Canarias. Se calibraron las funciones de Framingham y SCORE, y se estimó su concordancia. Se obtuvo, para estas edades, la tasa poblacional de mortalidad cardiovascular y se confrontó con el riesgo predicho por las funciones. Resultados: En los hombres, la tasa de mortalidad por 100.000 habitantes fue de 67,4, en tanto que la estimación de Framingham, SCORE-Low y SCORE-High fue de 80, 140 y 270, respectivamente. En las mujeres, frente a una tasa de 19,3, la estimación fue de 30, 50 y 70, respectivamente. Ambas funciones detectaron el incremento del riesgo aportado por los factores estudiados, con la excepción, en las mujeres, del sedentarismo con SCORE y del consumo excesivo de alcohol con ambas funciones. En los hombres, tomando para Framingham los puntos de corte de >12%, >15% y >20%, la concordancia con SCORE-Low produjo una Kappa de 0,6, 0,7 y 0,5, respectivamente. Conclusiones: La función de Framingham estimó mejor las tasas de mortalidad que la función SCORE. Únicamente la función de Framingham detectó en ambos sexos el riesgo cardiovascular aportado por el sedentarismo. En Canarias recomendamos la aplicación de la función de Framingham calibrada.Introduction: To compare the performance of the Framingham and SCORE functions to estimate fatal cardiovascular events. In addition, we explored the ability of both functions to detect the risk contributed by factors not included in their equations: sedentariness, obesity, abdominal circumference, abdomen

  19. Consideraciones sobre la utilización de diferentes densidades en el cultivo de papaya (Carica papaya, L. "Baixinho de Santa Amalia" en islas canarias Different plantation densities for papaya (Carica papaya, L cv. "Baixinho de Santa Amalia" culture in the canary islands

    Directory of Open Access Journals (Sweden)

    Mª Cristina Rodriguez Pastor

    2002-12-01

    Full Text Available El cultivo de papaya en Islas Canarias se ha extendido en los últimos años bajo condiciones de invernadero. La utilización de cultivares de papaya tipo "Baixinho de Santa Amalia" (mutante natural del cultivar "Sunrise" de porte bajo, emisión de la flor a corta altura y precocidad en la floración, resultan de gran interés sobre todo en esta clase de medios. Estas características fenológicas hacen posible el manejo del cultivo a mayores densidades que las empleadas con otros cultivares. Por lo tanto, se ha planteado este trabajo cuyo objetivo principal es determinar cual es el marco de plantación óptimo, que permita obtener mayores rendimientos sin depreciar la calidad del fruto. Para ello, se ha evaluado la producción tanto de las plantas hermafroditas como de las plantas femeninas durante dos ciclos de cultivo, así como las características organolépticas, grado de carpeloidía y deformación de los frutos. Los resultados indican que la densidad mayor, proporciona mejor comportamiento de las plantas así como mayor producción de frutos y menor porcentaje de fruta desechable.The growth of papaya plants under greenhouse conditions has recently become the norm in the Canary Islands. The use of "Baixinho de Santa Amalia" (a natural mutant of the "Sunrise" cultivar, which is a dwarf cultivar flowering early and not high up the plant, is the great interest, above all under these conditions. These phenological characteristic make possible the planting at higher densities than for other cultivars. This study has been carried out to determine the optimal planting density to permit greater production without reducing fruit quality. To this aim the yield, both of hermaphrodite and female plants, has been evaluated through two crop cycles, as well as studying the organoleptic characteristics, degree of carpellody and deformation of the fruits. The results suggest that the highest density provides better plant perfomance as well as higher fruit

  20. Influencia de la pérdida foliar sobre la cosecha en el cv. Gruesa, Musa acuminata Colla (AAA, cultivado bajo invernadero en las Islas Canarias Influence of leaf removal in yield of cv. Gruesa, Musa acuminata Colla (AAA, cultivated under greenhouse in the Canary Islands

    Directory of Open Access Journals (Sweden)

    Juan Cabrera Cabrera

    2010-12-01

    Full Text Available El cultivo de la variedad de platanera Gruesa, selección local de Dwarf Cavendish, ha experimentado un importante aumento en los últimos años en las Islas Canarias, tanto al aire libre como bajo invernadero. La eliminación de hojas, tras la floración, es una práctica habitual en los cultivos bajo invernadero. Asimismo es frecuente la pérdida de hojas por el efecto de los vientos en los cultivos al aire libre. El objetivo de este trabajo es evaluar, mediante simulación de pérdida foliar por daños mecánicos, la influencia que tiene la disminución de superficie foliar sobre el llenado y cosecha de la fruta en dicho cultivar. Para ello, cuatro meses antes de la cosecha se efectuaron cinco niveles de defoliación: 0%, 25%, 50%, 75% y 100%. Se valoran dos métodos diferentes de defoliación, eliminación de limbo foliar y tronchado de hojas con posterior corte de éstas. Se analizan y presentan datos morfológicos, fenológicos y productivos, así como valoración de la metodología empleada en este trabajo para la simulación de daños. A partir de un 25% de defoliado, equivalente a 7.5 hojas funcionales por planta, se detectaron diferencias significativas con las plantas testigos.The banana cultivar Gruesa, a local Dwarf Cavendish selection, is increasingly planted in the Canary Islands, both in greenhouse and in the open air. Both methods present some degree of leaf loss throughout the crop cycle: the leaves of greenhouse plants are traditionally cut back after flowering, and open air plantations experience frequent wind damage. A trial was set up four months prior to harvest to evaluate fruit filling rate and yield of Gruesa subjected to five levels of defoliation (0%, 25%, 50%, 75%, and 100% loss of leaf area. Two defoliation techniques were used to simulate damage: removal of the midrib, and slashing the leaf blade followed later by complete removal. Morphological, phenological and production data are presented.

  1. Radon in Groundwater of the Northeastern Gran Canaria Aquifer

    OpenAIRE

    Héctor Alonso; Tatiana Cruz-Fuentes; Jesús G. Rubiano; Jonay González-Guerra; María del Carmen Cabrera; Miguel A. Arnedo; Alicia Tejera; Alejandro Rodríguez-Gonzalez; Francisco J. Pérez-Torrado; Pablo Martel

    2015-01-01

    222Rn has been detected in 28 groundwater samples from the northeast of Gran Canaria (Canary Islands, Spain) utilizing a closed loop system consisting of an AlphaGUARD monitor that measures radon activity concentration in the air by means of an ionization chamber, and an AquaKIT set that transfers dissolved radon in the water samples to the air within the circuit. Radon concentration in the water samples studied varies between 0.3 and 76.9 Bq/L. Spanish radiological protection regulations lim...

  2. Non-native vascular plants from Canary Islands (Spain): nomenclatural and taxonomical adjustments

    OpenAIRE

    VERLOOVE, F

    2013-01-01

    Se propone correcciones taxonómicas y nomenclaturales respecto a 88 taxones no nativos de la lista de plantas vasculares de las Islas Canarias (España). Non-native vascular plants from Canary Islands (Spain): nomenclatural and taxonomical adjustments. Corrections and other adjustments are proposed for 88 non-native taxa from the checklist of vascular plants from the Canary Islands (Spain).

  3. Evolución de la mortalidad y de los años de vida perdidos prematuramente relacionados con el consumo de alcohol en las Islas Canarias (1980-1998 Trends in mortality and years of life lost related to alcohol in the Canary Islands, Spain (1980-1998

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    L.M. Bello

    2003-12-01

    óvenes.Objective: The aim of this article was to describe death rates and years of life lost prematurely (YLLP in relation to alcohol consumption in the Canary Islands. The study covered the period between 1980 and 1998. Methods: Deaths from 1980 to 1998 were classified by age, sex, and cause using data obtained from the National Institute of Statistics (Natural Changes in the Population. The number of alcohol-related deaths was calculated by year, sex, and age group using the attributable population fraction as proposed by the Centers for Disease Control (USA. The YLLP attributed to alcohol consumption were calculated for each cause of death by multiplying deaths by the attributable population fraction in 5-yearly age groups for both sexes (average span of five years, up to the age of 65 years. Results: Between 1980 and 1998, the number of alcohol-related deaths was 12,614, averaging 6.4% per year and with a male-to-female ratio of approximately 2:1. The main causes of death and YLLP in both men and women were malignant neoplasms, diseases of the digestive system, and alcohol-related accidents, although accidents were by far the main cause producing 50.6% of alcohol-related YLLP in men and 55.5% in women. Over the study period, the incidence of cirrhosis of the liver and that of other chronic liver diseases (CIE 571 decreased in men whilst remaining stable in women. Conclusions: The finding that the percentage of alcohol-related deaths and cirrhosis of the liver remained high in the Islas Canarias between 1980 and 1998 highlights the need for educational strategies on the effects of alcohol, together with policies designed to reduce its consumption, particularly among the young.

  4. El oficio de los neveros en Gran Canaria en el siglo XVIII

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    Salvador Miranda Calderin

    2013-11-01

    Full Text Available A finales del s. XVII el Cabildo Catedral de Canarias, con sede en la capital de Gran Canaria, construyó en la cumbre de la Isla dos pozos de nieve. Allí la recogían y conservaban hasta que era transportada en verano a la ciudad. Las libras de nieve se vendieron en la «nevería» ubicada en la trasera de la Catedral desde 1694 hasta 1866. En este artículo estudiamos el oficio de nevero en Gran Canaria, que había sido olvidado por completo, sus salarios, alimentación y especialidades en el s. XVIII.At the end of XVIIIth century the Canary Cathedral Chapter, settled in Gran Canaria Island capital, built, up in the mountains, two snow wells. Workers collected the snow and filled the wells until it was transported, in summer time, from the top of the island (1.949 meters to the city. Snow pounds were sold in the back of the Cathedral from 1694 to 1866. In this article we study the «neveros» job (snow workers in Gran Canaria, that it had been completely forgotten nowdays, their salaries, food and specialities in XVIIIth century.

  5. Pactos electorales y coaliciones de gobierno en Canarias (1979-2002 Pactos electorales y coaliciones de gobierno en Canarias (1979-2002

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    José Adrián García Rojas

    2003-01-01

    Full Text Available Canary Islands are one of the Spanish Regional Governments that have had to conform coalition Governments in their different levels of Government. In this article we analyse the evolution of the coalition Governments, the coalition agreements between political forces, and the coalitional dynamic in Canary Islands. One of the explanations of the canarian politics is the importance of the insular political arenas and the oversize of the local factors in the Canary Islands political system, above over, in the 1987-1993 period. The fragmentation of the Canarian Parliament and the existence of different party systems in everyone of the seven islands, have contributed to create a coalitional dynamic that we could divided in three periods: a 1979-1987, in this period the coalition agreements are of national range; b 1987-1993, in this period the coalitional agreements are of insular range because the irruption of the island range parties in the Canary Islands political life; and c 1993- until now, in this period the irruption of Canary Coalition party begin a regional agreements policy in all the levels of Government.Canarias es una de las Comunidades Autónomas españolas que ha tenido que conformar Gobiernos de coalición en sus distintos niveles de gobierno. En este trabajo analizamos la evolución de los gobiernos de coalición, los pactos en que se sustentan y la dinámica coalicional en las Islas. Una de las variables explicativas de la política en Canarias es la importancia de las arenas insulares y el sobredimensionamiento de los factores locales en el sistema político isleño, sobre todo, en el período 1987-1993. La fragmentación del Parlamento de Canarias y la existencia de subsistemas de partidos distintos en cada una de las siete islas, han contribuido a crear una dinámica coalicional que podemos dividir en tres etapas: a 1979-1987, en la que domina la política de pactos nacionales, b 1987-1993, en la que se produce la insularizaci

  6. Control software and user interface for the Canarias Infrared Camera Experiment (CIRCE)

    Science.gov (United States)

    Marín-Franch, Antonio; Eikenberry, Stephen S.; Charcos-Llorens, Miguel V.; Edwards, Michelle L.; Varosi, Frank; Hon, David B.; Raines, Steven N.; Warner, Craig D.; Rashkin, David

    2006-06-01

    The Canarias InfraRed Camera Experiment (CIRCE) is a near-infrared visitor instrument for the 10.4-meter Gran Telescopio Canarias (GTC). This document shows CIRCE software. It will have two major functions: instrument control and observatory interface. The instrument control software is based on the UFLIB library, currently used to operate FLAMINGOS-1 and T-ReCS (as well as the CanariCam and FLAMINGOS-2 instruments under development in the University of Florida). The software interface with the telescope will be based on a CORBA server-client architecture. Finally, the user interface will consist of two java-based interfaces for the mechanism/detector control, and for quick look and analysis of data.

  7. The reuse of regenerated water for irrigation of a golf course: evolution geochemistry and probable affection to a volcanic aquifer (Canary Islands); La reutilizacion de aguas regeneradas para riego de un campo de golf: evolucion geoquimica y probable afeccion a un acuifero volconico (Islas Canarias)

    Energy Technology Data Exchange (ETDEWEB)

    Cabrera, M. C.; Palacios, M. P.; Estevez, E.; Cruz, T.; Hernandez-Moreno, J. M.; Fernandez-Vera, J. R.

    2009-07-01

    Irrigation reuse of treated urban wastewater presents unquestionable advantages, but recently some possible unfavourable effects that need to be studied in the long term have been detected. The Bandama golf course, located at the NE of Gran Canaria, has been selected to develop an integrated study of the affection on a medium-long term, due to it has been irrigated with reused water for more than 30 years. The characterization of irrigation water, soil, soil lixiviate and aquifer functioning has allowed to obtain preliminary conclusions pointing to the importance of the soil nature, the precipitation, the irrigation management and the hydrogeologic conditions in the soil and aquifer response, In the study area, this is complicated for the existence of about 250 m thick unsaturated zone conformed by volcanic materials where water must flow through fractures, making impossible to be sampled. (Author) 7 refs.

  8. Preferencias de hábitat, densidad y diversidad de las comunidades de aves en Tenerife (Islas Canarias

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    Carrascal, L. M.

    2005-12-01

    Full Text Available Species–specific habitat preferences, density and species richness of bird communities in Teneriffe (Canary Islands Bird distribution and abundance are described and analyzed in Teneriffe (Canary Islands. Inter–habitat differences in density, diversity and species richness are shown in table 1. Figure 2 shows the main determinants of bird species richness in Teneriffe, and tables 2 and 3 and figure 3 show the species–specific patterns of spatial variation abundance (more detailed for Anthus berthelotii, Fringilla coelebs canariensis, Fringilla teydea, Parus caeruleus teneriffae, Phylloscopus canariensis, Regulus teneriffae, Serinus canarius and Turdus merula cabrerae. Deeply transformed environments due to human impact (urban habitats, agricultural mosaics, banana plantations have high bird densities and species richness, even higher than those measured in native, unmodified habitats such as laurel forests or mature pinewoods. Urban environments in Teneriffe are very permeable to native bird fauna, as they have been occupied by many widespread endemic species/subspecies. Many of the endemic, well defined species or subspecies of island birds have high population densities within native, untransformed habitats. Density compensation and niche expansion is not a common phenomenon in the avifauna of Teneriffe. Nevertheless, all species/subspecies broadening the inter–habitat or altitudinal distribution are endemic of the Canary Islands.

  9. Evaluación del progreso de aprendizaje en lectura dentro de un Modelo de Respuesta a la Intervención (RtI en la Comunidad Autónoma de Canarias /Evaluating progress in reading acquisition within a Response to Instruction model in the Canary Islands

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    Juan E. Jiménez

    2011-08-01

    Full Text Available The main aim of this study is to provide an overview of monitoring progress within a Response to Intervention model (Tier-2, small group intervention used in the Canary Islands. This programme is conducted within the framework of a scientific cooperation agreement between the University of La Laguna research team “Dificultades de aprendizaje, psicolingüística y nuevas tecnologías” (“Problems in learning, psycholinguistics, and the new technologies”, the University of Oregon’s Center on Teaching and Learning, and the Consejería de Educación, Universidades y Sostenibilidad of the Canary Islands Government. The Indicadores Dinámicos del Éxito Lector is used for monitoring progress. The Indicadores Dinámicos del Éxito Lector is the Spanish version of Dynamic Indicators of Basic Early Literacy Skills. Its main purpose is to evaluate reading progress in students identified as “at risk” of developing reading difficulties using an Response to Intervention model.

  10. Epidemiological survey of zoonotic helminths in feral cats in Gran Canaria island (Macaronesian archipelago-Spain).

    Science.gov (United States)

    Rodríguez-Ponce, Eligia; González, Jorge F; Conde de Felipe, Magnolia; Hernández, Julia N; Raduan Jaber, J

    2016-09-01

    The presence of zoonotic parasites in feral cats have been widely considered all over the world. In Gran Canaria (Macaronesian archipelago, Canary Islands, Spain) the number of feral cats has grown out of control in urban and rural areas. 48 of Felis catus captured in different Gran Canaria areas were studied. Animals were necropsied and several organs were systematically examined in order to collect and identify macroscopic parasites. In addition, coprological tests were done in 28 cats. There were no statistically significant differences in the prevalence rate among sex, age or capture area, showing an overall prevalence of helminths of 77.1%. The most common tapeworms were Dipylidium caninum (64.6%) and Taenia taeniaeformis (31.3%), followed by the nematodes Toxocara cati (20.8%), Ancylostoma tubaeforme (18.8%), Aelurostrongylusabstrusus (10.4%) and Trichuris vulpis (2.08%). We also find several eggs of Alaria alata in the small intestine of one cat (2.08%), being the first description of this trematode in cats in the Canary Islands. Aproximatelly, 40% of the studied cats harboured more than one parasite. High rates of zoonotic species found in these animals suggest the need of controling parasitic infections and preventive measures against them. PMID:27447205

  11. Genes, geology and biodiversity: faunal and floral diversity on the island of Gran Canaria

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    Emerson, B. C.

    2003-01-01

    Full Text Available High levels of floral and faunal diversity in the Canary Islands have attracted much attention to the archipelago for both evolutionary and ecological study. Among the processes that have influenced the development of this diversity, the volcanic history of each individual island must have played a pivotal role. The central island of Gran Canaria has a long geological history of approximately 15 million years that was interrupted by violent volcanism between 5.5 and 3 million years ago. Volcanic activity is thought to have been so great as to have made all plant and animal life virtually extinct, with survival being limited to some coastal species. The implication from this is that the higher altitude laurel forest and pine woods environments must have been re-established following the dramatic volcanic period. This paper reviews the evidence for this using recent molecular phylogenetic data for a number of plant and animal groups on the island of Gran Canaria, and concludes that there is general support for the hypotheses that the forest environments of Gran Canaria post-date the Roque Nublo eruptive period.

  12. Radon in Groundwater of the Northeastern Gran Canaria Aquifer

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    Héctor Alonso

    2015-05-01

    Full Text Available 222Rn has been detected in 28 groundwater samples from the northeast of Gran Canaria (Canary Islands, Spain utilizing a closed loop system consisting of an AlphaGUARD monitor that measures radon activity concentration in the air by means of an ionization chamber, and an AquaKIT set that transfers dissolved radon in the water samples to the air within the circuit. Radon concentration in the water samples studied varies between 0.3 and 76.9 Bq/L. Spanish radiological protection regulations limit the concentration of 222Rn for drinking water to 100 Bq/L, therefore the values obtained for all the analyzed samples are below this threshold. The hydrogeological study reveals a significant correspondence between the radon activity concentration and the material characteristics of the aquifer. For a selected group of samples with high radon concentrations, gross alpha activity has been determined to have values higher than the prescriptive screening level (0.1 Bq/L.

  13. Phytoseiid mites of the Canary Islands (Acari, Phytoseiidae. II. Tenerife and La Gomera Islands

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    Ferragut, F.

    2007-12-01

    Full Text Available Phytoseiid mites (Acari, Phytoseiidae inhabiting plants in natural ecosystems from Tenerife and La Gomera islands (Canary Islands have been studied. Surveys were conducted from 1997 to 2002. Eleven species were collected, one of them being reported for the first time from the Canary Islands and six of them reported for the first time from Tenerife and La Gomera islands. Euseius machadoi n. sp. collected from woody plants in the Canarian laurisilva is proposed as a new species.

    En muestreos realizados desde 1997 hasta 2002 se ha estudiado la fauna de ácaros fitoseidos (Acari, Phytoseiidae asociada a plantas de ecosistemas naturales de las islas de Tenerife y La Gomera (Islas Canarias. Se han recolectado un total de 11 especies, siendo una de ellas citada por vez primera en las islas Canarias y seis de ellas citadas por primera vez en las islas de Tenerife y La Gomera. Euseius machadoi n. sp., recolectado en plantas leñosas de la laurisilva canaria, se propone como una nueva especie.

  14. Labile carbon pools and biological activity in volcanic soils of the Canary Islands Fracciones de carbono orgánico lábil y actividad biológica en suelos de origen volcánico de las Islas Canarias Frações de carbono orgânico lábil e actividade biológica em solos de origem vulcânica das Ilhas Canárias

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    Cecilia María Armas Herrera

    2013-03-01

    Full Text Available It is important to assess the mineralisation of soil organic carbon (SOC to predict the short-term response of biosphere carbon reservoirs to changing environmental conditions. We investigated the labile (easily-mineralisable SOC in volcanic soils, where the bioavailability of SOC is typically affected by physico-chemical stabilisation mechanisms that are characteristic of these soils. Ten soils were selected that represent the most typical soil types (mainly Andosols and natural habitats (xerophytic scrubland, laurel forest and pine forest in the Canary Islands, a volcanic archipelago. Over two years we measured several physico-chemical SOC fractions with different degrees of bioavailability: water-soluble carbon in fresh soil samples (WSC and in the saturated extract (WSCse, hot water-extractable carbon (HWC, potassium sulphate-extractable carbon (PSC, microbial biomass carbon (MBC, particulate organic carbon (POC, humic substances carbon (HSC, and total organic carbon (TOC, and performed CO2 emission incubation assays. We related these measurements to the potential C inputs of plant litter and roots and to the activity of certain hydrolytic enzymes (CM-cellulase, ?-D-glucosidase, and dehydrogenase that are involved in carbon turnover. In vitro carbon mineralisation measurements from short assays (ten days were fitted with simple first-order kinetics to investigate SOC. This procedure was simple and allowed us to obtain estimates both for potentially mineralisable SOC and for the heterogeneity of the substrates that were consumed during incubation. The investigated volcanic soils had large labile SOC concentrations in which simple carbohydrates predominated and that were mainly derived from roots and aboveground non-woody residues. Among the analysed physico-chemical SOC fractions, HWC (3.1 g kg-1 on average at 0-30 cm depth in Andosols was the most correlated with C0 (1.2 g kg-1 and therefore best represents potentially mineralisable SOC. PSC

  15. Escultismo y educación física en Canarias (1912-1920

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    Antonio S. Almeida Aguiar

    2013-10-01

    Full Text Available Uno de los movimientos juveniles que mayor repercusión ha tenido en la historia de la educación ha sido los Boy Scouts. Fundado en 1907 por el general Baden Powell, tenía como fin la mejora social de la juventud inglesa. La extensión de la asociación scout fue rápida y en todo el mundo. En España, al igual que en Canarias, fue introducida en 1912 por los militares. Entre los principales puntos de la pedagogía scout está la importancia de la educación física en el desarrollo del ser humano como parte integrante de su educación. Precisamente, la educación física y su extensión en Canarias deben mucho al escultismo. En el presente artículo trataremos de determinar los orígenes de la asociación en las islas, con especial incidencia en el consejo local de la ciudad de Las Palmas de Gran Canaria, así como la trascendencia que tuvo en la juventud la incorporación de la educación física como parte de la educación general.One of the most important youth movements in the history of education has been the Boy Scouts. Founded in 1907 by General Baden Powell, whose aim was to improve the social conditions of the English youth. The wide- ranging scope of the scout’s association developed rapidly across the globe. In Spain, as in the Canary Islands, it was started in 1912 by the military. Its main educational functions include physical education in developing the personal growth of human beings as an integral part of their overall education. Indeed, physical education and its development in the Canary Islands owe much to the scout movement. In the present paper we will explore the origins of the association in the islands, with emphasis on the local council in Las Palmas de Gran Canaria.

  16. Chemical characterisation of african dust transported to Canary Region

    Science.gov (United States)

    Gelado, M. D.; López, P.; Prieto, S.; Collado, C.; Hernández, J. J.

    2009-04-01

    African dust pulses have important effects on the climate conditions and the marine biogeochemistry in the Canary Region. Aerosol samples have been collected at three stations on Gran Canaria Island (Taliarte at sea level, Tafira 269 m a.s.l. and Pico de la Gorra 1930 m a.s.l.) during 2000-2008. Elemental characterisation of the collected mineral aerosol and back trajectories of the air masses are used to distinguish regional African sources of dust. Dust aerosol samples from North Sahara (Morocco, North Algeria and Tunisia), West and Central Sahara (20°-30°N, 18°W-50°E) and Sahel (0°-20°N, 18°W-50°E) have shown different Ca/Ti, Al/Ti and Fe/Al ratios. Ti appears as a better tracer element of specific source of dust than Fe, probably due to a less mineral alteration during the atmospheric transport.

  17. Megabacteriosis Occurrence in Budgerigars, Canaries and Lovebirds in Ribeirao Preto region - Sao Paulo State - Brazil Ocorrência de Megabacteriose em Periquitos Autralianos, Canários e Agapornis na Região de Ribeirão Preto- Estado de São Paulo - Brasil

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    K Werther

    2000-08-01

    Full Text Available This paper reports the occurrence of an megabacterium-like organism at small birds from the Northeast area of São Paulo State - Brazil. The results presented herein were obtained from 64 necropsy along four years (1994-1997. Sixty four birds (4 budgerigars Melopsittacus undulatus, 12 lovebirds Agapornis spp and 48 canaries Serinus canaria were studied. At 56% of the examined birds showed at the proventricular mucus smear a presence of rod-shaped (similar to a toothpick organisms, Gram positive and acidophilic in Giemsa staining, called megabacteria. Different kind of culture media was testes to replicated these organism in vitro. Also the dimension (large and width of the fresh microorganism from the proventricular mucus and from the first culture was compared. The macroscopic alterations observed at the necropsies was also listed.Este trabalho tem como objetivo relatar a ocorrência de um agente etiológico, denominado na Europa, Australia e EUA como "megabactéria", observado em estômago de pequenas aves (canários belgas, agapornis e periquitos australianos, provenientes da região de Ribeirão Preto, Estado de São Paulo/SP. As necropsias de 64 aves silvestres (4 periquitos australianos, 12 agapornis e 48 canários, realizadas no perído de 1994 a 1997, foram analisadas, constatando-se em 56% dos casos a presença de estruturas filiformes, acidofílicas sob coloração Giemsa, gram positivas, existentes no muco do proventrículo, descritas na literatura como "megabactérias". Foram testados diversos tipos de meios de cultura para reprodução in vitro deste microrganismo. Foram ainda comparadas as dimensões (comprimento e largura dessa bactéria obtida apartir do esfregaço fresco de muco proventricular e da "megabactéria" proveniente de cultivo in vitro. Também foram listados os principais achados macroscópicos do animais portadores desta bactéria.

  18. Aminocronoestratigrafía e historia térmica de los depósitos cuaternarios de las Islas Canarias (España): resultados preliminares de la Isla de Lanzarote

    OpenAIRE

    Torres Pérez-Hidalgo, Trinidad José de

    1996-01-01

    This paper deals on the first results of an Amino acid racemization dating campaing carried out on coastal and archaeological mollusca deposits of Lanzarote and Gran Canaria islands (Canary Islands, Spain). First results pointed out to a marked difference into amino acid kinetics, when compared with Iberian Peninsula one: leucine, AI isoleucine and aspartic acid racemizate faster (100%) than in the Iberian Peninsula gastropod samples. Glutamic acid and phenilalanine racemizate muc...

  19. Aminocronoestratigrafía e historia térmica de los depósitos cuaternarios de las Islas Canarias (España). Resultados preliminares de la Isla de Lanzarote

    OpenAIRE

    García Alonso, P.; Hoyos, M.; Llamas, J.; V. Soler; Torres, T.

    1996-01-01

    This paper deals on the first results of an Amino acid racemization dating campaing carried out on coastal and archaeological mollusca deposits of Lanzarote and Gran Canaria islands (Canary Islands, Spain). First results pointed out to a marked difference into amino add kinetics, when compared with Iberian Peninsula one: leucine, Al isoleuclne and aspartic acid racemizate faster (100%) than in the Iberian Peninsula gastropod samples. Glutamic acid and phenilalanine racemizate much more faster...

  20. Archaeology in the Canary Islands during the Franco regime: the original settlement of the Islands as paradigm (1939-1969

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    Farrujia de la Rosa, A. José

    2004-06-01

    Full Text Available In the present article, we analyze the contributions of the authors linked to the Provincial Commissary for Archaeological Excavations in the Canaries. Their studies led to the development of a nationalist prehistory of these islands. Developed during Franco’s regime, this prehistory was directly influenced by the theoretical, practical and ideological guidelines that gave meaning to the studies of peninsular prehistory at this time. An approach to the topic of the original colonization of the Canary Islands, allows us to highlight the relationship that existed between politics and archaeology, and therefore, between the power and the generation of the scientific knowledge.

    Durante el franquismo, la aportación de los distintos autores vinculados con las Comisarías Provinciales de Excavaciones Arqueológicas de Canarias daría pie al desarrollo de una lectura nacionalista de la prehistoria canaria, directamente influenciada por las directrices teóricas, prácticas e ideológicas que por entonces daban sentido a la prehistoria peninsular. Una aproximación al estudio del primitivo poblamiento de las Islas Canarias durante este período nos ha permitido sacar a relucir la estrecha relación que existió entre la política y la arqueología y, por ende, entre el poder y la generación del conocimiento científico.

  1. Canarias: entre el desarrollo turístico y la protección al medio

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    Tanausú Perez Garcia

    2010-11-01

    Full Text Available Les îles Canaries, situées dans la région  de la ‘Macaronésica’ (l’Est de l’Océan Atlantique, abritent des écosystèmes marins et terrestres très précieux, tant du point de vue écologique que paysager. Ils sont représentatifs de les zones biogéographiques de sa région et comptent trois Réserves da Biosphère reconnues par l’UNESCO. De grands scientifiques comme Alexander Von Humboldt et Charles Darwin ont fait l’éloge de la richesse de la biodiversité de cet archipel. Cependant, actuellement, la pression anthropique, notamment en liaison avec le développement touristique et tous les enjeux économiques qui l’accompagnent, mettent en danger les écosystèmes des Canaries ; ce constat a ouvert un large débat sur les enjeux autour des développements économique et touristiques et leurs dérives. Notre article propose de mettre l’accent sur les  caractéristiques des îles Canaries  et de replacer les processus de développements touristiques dans leur contexte pour ouvrir la réflexion sur les conditions nécessaires pour d’un développement durable.The Canary Islands, located in the region of 'Macaronésica' (Este of Atlantic Ocean, are home to marine and terrestrial ecosystems very valuable, both ecological and landscape. They are representative of the bio-geographic zones of the region and there are three Biosphere Reserves da recognized by UNESCO. Great scientists such as Alexander Von Humboldt and Charles Darwin have praised the richness of the biodiversity of this archipelago. However, at present, anthropogenic pressure, including in relation to tourism development and all economic issues that accompany it, endanger ecosystems Canary Islands. This has opened a broad debate on the issues surrounding economic development and tourism and their excesses. Our article proposes to focus on the characteristics of the Canary Islands and put the process of tourist developments in their context to open reflection

  2. El ataque de Van der Does: piedra de toque para una transformación económica de Gran Canaria

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    Germán Santana Pérez

    2013-11-01

    Full Text Available A finales del siglo XVI las Islas Canarias vivieron una transformación rcon6mica. La importancia de la caña de azúcar había sido constante a lo largo de todo el siglo XVI. No obstante, su peso había disminuido a filiales de esa centuria y entró claramente en crisis desde principios del siglo XVII. Esta transformación no se vivió por igual en todas las Islas, ya que en Tenerife esta se tradujo en una época de esplendor, mientras que en Gran Canaria fue lo contrario, entrando en una fase de estancamiento. Además, las islas se vieron afectadas por epidemias, sequías y ataques corsarios en el cambio de centuria. En este ambiente sobrevino el ataque de Van der Does a Las Palmas en 1599, lo que acentuó la transformación económica.The Canary Island had an economic transformation at the end of the sixteenth century. The importance of sugar cane was constant throught the sixteenth century. However it was decreasing since the end of sixteenth century and it was short at start of seventeenth century. We can see like that seventeenth century is good for the economy in Tenerife, but in Gran Canaria is the opposite. This was so because there was change in the Canary production. So, the most important was the change in the vine and the cereal, in opposite to the sugar cane. The Canary Islands was affected by plagues, droughts and pirates too. So, the Van der Does's attack, in 1599, increased the economic  transformation.

  3. Las actividades agroambientales en Canarias ante los retos de futuro

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    Ramón Díaz Hernández

    2013-10-01

    Full Text Available Las actividades primarias en Canarias, y en especial, la agricultura, presentan una situación de crisis que amenaza con aumentar el abandono de fincas, la reducción de la producción y la pérdida de población rural. Los valores económicos, sociales, ambientales y culturales que caracterizan a estas actividades aconsejan una apuesta más decidida por el mantenimiento del sector, para lo que es necesario replantear en muchas zonas el desarrollo agrario integral vinculándolo a la conservación y recuperación ambiental y cultural, dentro de una concepción de desarrollo sostenible. Pues bien, en este artículo, partiendo de la exposición del valor que tiene la actividad agraria en las Islas, se describe su problemática actual y se apuntan sus oportunidades de desarrollo. Se concluye precisándose, a partir de los instrumentos de intervención existentes, objetivos globales, algunas recomendaciones estratégicas generales y propuestas de intervención que podrían ser tenidos en cuenta.Primary activities in the Canary Islands, and especially agriculture, are undergoing a crisis that threatens to continue to promote a move away from the countryside, a reduction in production and rural de-population. The economic, social, environmental and cultural values that characterise these activities indicate a need for more decisive support for maintaining this sector, making an integral development of farming necessary in many areas, linked to environmental and cultural conservation and recovery, as part of a sustainable development approach to the problem. With the value of farming activities as a starting point, this article describes the current problems and identifies the opportunities for development. The articles concludes by establishing global objectives, based on existing intervention instruments, some general strategic recommendations and proposals for intervention that could be taken on board.

  4. EL MAR DE CANARIAS. DESCRIPCIÓN GEOPOLÍTICA DE UNA SITUACIÓN PROBLEMÁTICA

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    Gilberto Martín Teixé

    2005-12-01

    Full Text Available RESUMEN:El estudio y debate sobre el ordenamientojurídico de las aguas territoriales en las Islas Canarias es tema de permanente actualidad. En el problema inciden la situación geográfica de las islas, el status político administrativo por el que se rigen y la legislación del Derecho Internacional del Mar que se le aplica. La soluciones que se aportan son diversas y comúnmente supeditadas a la visión política que las inspiran. PALABRAS CLAVE:Geopolítica, Islas Canarias, archipiélago, aguas territoriales, aguas interiores, mar territorial, zona económica exclusiva, La Convención del Mar de las Naciones Unidas sobre el Derecho del Mar. ABSTRACT:The research and debate on the Canary Islands territorial waters legal code is always a current affair. Many aspects such as the geographic situation of the islands, the political administrative status and the intemational legislation of the sea to be applied are involved in this problem. The solutions that are offered are numerous and generally subordinated to the political vision that inspire them. KEY WORDS:Geopolitics, Canary Islands, archipelago, territorial waters, internal waters, territorial sea, exclusive economic zone, United Nations Convention on the Law of the Sea (UNCLOS RÉSUMÉ:"L'étude et le débat de l'ordonnance juridique des eaux territoriales aux iles Canaries est un sujet de permanente actualité. Dans le problkme coincident la situation géograp- hique, le status politique-administratif par lequel elles sont régies et la Législation du Droit Intemational de la Mer que l'on lui applique. Les solutions apportées sont différentes et norma- lement soumises a la vision politique qui les inspirent". MOTS CLÉ:Géographie politique, Iles Canaries, archipel, eaux territoriale, eaux intérieures, mer territoriales, zone économique exclusive, La Convention des Nations Unies sur le droit de la Mer. 

  5. Colonization and diversification of the Euphorbia species (sect. Aphyllis subsect. Macaronesicae) on the Canary Islands

    Science.gov (United States)

    Sun, Ye; Li, Yanshu; Vargas-Mendoza, Carlos Fabián; Wang, Faguo; Xing, Fuwu

    2016-01-01

    Diversification between islands and ecological radiation within islands are postulated to have occurred in the Euphorbia species (sect. Aphyllis subsect. Macaronesicae) on the Canary Islands. In this study, the biogeographical pattern of 11 species of subsect. Macaronesicae and the genetic differentiation among five species were investigated to distinguish the potential mode and mechanism of diversification and speciation. The biogeographical patterns and genetic structure were examined using statistical dispersal-vicariance analysis, Bayesian phylogenetic analysis, reduced median-joining haplotype network analysis, and discriminant analysis of principal components. The gene flow between related species was evaluated with an isolation-with-migration model. The ancestral range of the species of subsect. Macaronesicae was inferred to be Tenerife and the Cape Verde Islands, and Tenerife-La Gomera acted as sources of diversity to other islands of the Canary Islands. Inter-island colonization of E. lamarckii among the western islands and a colonization of E. regis-jubae from Gran Canaria to northern Africa were revealed. Both diversification between islands and radiation within islands have been revealed in the Euphorbia species (sect. Aphyllis subsect. Macaronesicae) of the Canary Islands. It was clear that this group began the speciation process in Tenerife-La Gomera, and this process occurred with gene flow between some related species. PMID:27681300

  6. MIO-PLIOCENE CRUSTACEANS FROM THE CANARY ISLANDS, SPAIN

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    JUAN FRANCISCO BETANCORT

    2014-11-01

    Full Text Available There are few previous references to fossil crustaceans for the Neogene marine layers of the Canary Islands (Spain. The Mio-Pliocene marine sedimentary layers in the eastern islands (Gran Canaria, Fuerteventura and Lanzarote were previously characterised by the presence of numerous fossil fauna, mainly anthozoans and molluscs, which correspond to an equatorial-typepalaeoclimate, warmer than the present climate. This Mio-Pliocene transition dated between 9.3 and 4.1 Ma. In this paper, 12 fossil crustacean taxa are identified and classified, including decapods and barnacles: Balanus concavus Bronn, 1831, Balanus spongicola Brown, 1827, Balanus perforatus Bruguière, 1789, Chenolobia testudinaria Linnè, 1767, Tetraclita cf. rubescens Darwin, 1854, Callianassa matsoni Rathbun, 1935, Callianassa sp., Upogebia sp, Eriphia aff. verrucosa (Forskal, 1775 , Maja sp., Scylla michelini Milne-Edwards, 1861 and Ocypode sp. Some of these taxa mean new references for the Atlantic islands and the North African Atlantic and definitely enlarge the palaeographic distribution of Neogene crustaceans beyond the Mediterranean region, extending it to the North Atlantic. Particularly significant are the presence of Tetraclita cf. rubescens ,this being the first reported fossil occurrence of this barnacle outside the North America Pacific coasts, and Chenolobia testudinaria , indicating for the first time the existence of marine turtles in these islands during the Neogene. These results are coherent with previous research hypothesising the existence of a flow of surface water between the Pacific and Atlantic in the Mio-Pliocene transition (Central American Seaway, CAS which explains the arrival of organisms, in larval stage, from Central America to the Canary Islands.

  7. Turismo intervención publica en Canarias: transición del modelo cuantitivo al cuaitativo

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    Ramón Diaz Hernandez

    2008-09-01

    Full Text Available Confronté à une surfréquentation touristique, le Gouvernement local des Îles Canaries a publié un Arrêt (4/2001 qui reformule les Orientations Générales du Territoire et du Tourisme. L’objectif est de s’entendre sur les bases d’un modèle de développement insulaire soutenable, en mettant l’accent sur la gestion des ressources naturelles en général et le tourisme plus particulièrement. Cet Arrêt a été accompagné de normes dont l’objectif est de limiter la construction de nouveaux bâtiments hôteliers. Peu après, le Gouvernement a publié l’Arrêt 126/2001 qui limitait le développement touristique. Le Parlement adopta un autre Arrêt, la «Ley de Medidas Urgentes en Materia de Ordenación del Territorio y del Turismo de Canarias » (juillet 2001 qui détermine les conditions exigées aux établissements hôteliers de plus haute catégorie. Le Parlement donne aussi son accord à l’Arrêt 19/2003, «Directrices de Ordenación General y Directrices de Ordenación del Turismo de Canarias ».     Faced with excesses tourism, the local government of the Canary Islands issued a judgement (4 / 2001, which reformulates General Guidelines of Territory and Tourism. The aim is to set up the basis of a model of sustainable island development, with emphasis on natural resource management in general and tourism in particular. This decision was accompanied by standards whose objective is to limit the construction of new buildings for hotels. Shortly thereafter, the Government issued the ruling 126/2001 which limited the development of tourism. Parliament adopted another decree, "Ley de Medidas Urgent en Materia de Ordenación del Territorio y del Turismo de Canarias" (July 2001 which determines the conditions required for hotels higher category. The Parliament also gives its agreement to stop 19/2003, "Directrices de Ordenación General y Directrices de Ordenación del Turismo de Canarias."El desbordamiento ocasionado por el

  8. Primeros resultados para la reconstrucción dendroclimática de Canarias

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    Carlos L. Santana Jubells

    2013-11-01

    Full Text Available La aplicación de la Dendrocronología a poblaciones canarias de Pinus canariensis Smith, taxón que hasta el momento no había sido objetivo de esta ciencia, y la obtención de los primeros resultados positivos en la comparación cruzada de series de crecimiento, abren las puertas a una reconstrucción de las variables climáticas precipitación y temperatura del pasado en el Archipiélago. Entre las muchas aplicaciones que es posible derivar de dicha reconstrucción, centra el interés de la Prehistoria el conocimiento, desde una perspectiva diacrónica, de una parte fundamental del entorno ecológico en el que se desarrollan de las poblaciones pehispánicas de Canarias, como vía válida para enriquecer la interpretación de ciertas transformaciones culturales. Los cambios que se operan en la isla de La Palma en el tránsito entre las fases cerámica III y IV, pueden ser interpretados como claro exponente de la intima relación que existe entre el desarrollo de los sistemas culturales y las alteraciones de su marco medioambiental.The application of Dendrochronology to populations of Pinus canariensis Smith from the Canary Islands -species never studied by this science before- and the first positive results in cross-dating of tree-ring series, are achievements that lead to the future reconstruction of the past climatic variables precipitations and temperatures in the Canaries. Among the many applications derived from this climatic reconstruction, the knowledge from a dicahronic perspective if a fundamental piece of the ecological environment in wich the Canarian prehispanic peoples developed will provide Prehistory with a powerful tool to enrich the interpretation of certain cultural phenomena. The changes that took place in La Palma in the transition between the ceramic phases II and IV, can be interpreted as a clear example of the close relationship existing between development of cultural systems and modifications in its environmental frame.

  9. Los Laparocerus Schoenherr, 1834 de las Canarias orientales, islas Salvajes y Marruecos (Coleoptera, Curculionidae, Entiminae

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    Machado, A.

    2011-12-01

    Full Text Available This contribution to the knowledge of the genus Laparocerus Schoenherr, 1834 in Macaronesia concerns species from the Eastern Canaries, Salvage Islands and Morocco. Laparocerus rasus Wollaston, 1864 is redescribed and two new subspecies localised in Fuerteventura are ascribed to it: L. rasus betancor n. spp. and L. rasus jandiensis n. ssp. Several new species are described from that same island: L. maxorata n. sp., L. colonnellii n. sp., L. calvus n. sp., L. xericola n. sp., L. fraterculus n. sp., and L. longipennis n. sp.; from the island of Lanzarote L. curvipes famara n. ssp., and from the Selvage Islands L. garretai albosquamosus n. spp. The only confirmed species form Morocco, Laparocerus susicus (Escalera, 1914, is redescribed and L. susicus montanus n. spp., from the interior, and L. susicus inexpectatus nov. nom., from the coastal region of Tiznit are assigned to it. A retro-colonization from the Canary Islands to the continent is hypothesized for this Moroccan species. Doubtful records and unresolved species are commented on, and keys in Spanish and English for identifying all Laparocerus inhabiting this geographical context are provided.Esta contribución al conocimiento del género Laparocerus Schoenherr, 1834 está dedicada a las Canarias orientales, islas Salvajes y Marruecos. Se redescribe Laparocerus rasus Wollaston, 1864 y se le asignan dos nuevas subespecies localizadas en Fuerteventura: L. rasus betancor n. spp. y L. rasus jandiensis n. ssp. De esta misma isla se describen varias especies nuevas: L. maxorata n. sp., L. colonnellii n. sp., L. calvus, n. sp., L. xericola n. sp., L. fraterculus n. sp. y L. longipennis n. sp.; de la isla de Lanzarote L. curvipes famara n. ssp., y de las islas Salvajes L. garretai albosquamosus n. spp. Se redescribe la única especie confirmada de Marruecos, Laparocerus susicus (Escalera, 1914, a la que se adscriben L. susicus montanus n. spp., del interior, y L. susicus inexpectatus nom. nov., de

  10. Platería europea en Canarias. La bandeja de Teguise, la copa con tapa y las fuentes de la cetadral de Las Palmas

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    Jesús Pérez Morera

    2013-11-01

    Full Text Available Abordamos en este trabajo la correcta clasificaci6n de una serie de piezas da platería de origen flamenco, alemán y portugués existentes en Canarias que, aunque conocidas, habían pasado por españolas o americanas. Destacarnos la bandeja de la parroquia de Teguise (Lanzarote, labrada en Hamburgo por juergen Richels hacia 1680; la copa con tapa de la catedral de Las Palmas (Gran Canaria, realizada en Amberes por el maestro del compás en 1548-1549; y !as fuentes pertenecientes al obispo Vicuña y Zuazo de la misma catedral, marcadas en Lisboa a finales del siglo XVII.The current article approaches the correct classification of a variety o¡ flemish, german and portuguese silversmith's pieces located in the Canary Islands which, though very well known, had been considered form Spanish or american origin. We emphasize the tray from the Parisf of Teguise (Lanzarote\\, wrought in Hamburg by Juergen Richels circa 1680; the Chalice with Lid Las Palmas cathedral (Gran Canaria made in Antwerp by the Master  of  the compass in 1548-49; and the fountains belonging to Bishop Vicuña y Zuazo from the same cathedral, marked in Lisbon at the end of XVII century. 

  11. The deep Canary poleward undercurrent

    Science.gov (United States)

    Velez-Belchi, P. J.; Hernandez-Guerra, A.; González-Pola, C.; Fraile, E.; Collins, C. A.; Machín, F.

    2012-12-01

    Poleward undercurrents are well known features in Eastern Boundary systems. In the California upwelling system (CalCEBS), the deep poleward flow has been observed along the entire outer continental shelf and upper-slope, using indirect methods based on geostrophic estimates and also using direct current measurements. The importance of the poleward undercurrents in the CalCEBS, among others, is to maintain its high productivity by means of the transport of equatorial Pacific waters all the way northward to Vancouver Island and the subpolar gyre but there is also concern about the low oxygen concentration of these waters. However, in the case of the Canary Current Eastern Boundary upwelling system (CanCEBS), there are very few observations of the poleward undercurrent. Most of these observations are short-term mooring records, or drifter trajectories of the upper-slope flow. Hence, the importance of the subsurface poleward flow in the CanCEBS has been only hypothesized. Moreover, due to the large differences between the shape of the coastline and topography between the California and the Canary Current system, the results obtained for the CalCEBS are not completely applicable to the CanCEBS. In this study we report the first direct observations of the continuity of the deep poleward flow of the Canary Deep Poleward undercurrent (CdPU) in the North-Africa sector of the CanCEBS, and one of the few direct observations in the North-Africa sector of the Canary Current eastern boundary. The results indicate that the Canary Island archipelago disrupts the deep poleward undercurrent even at depths where the flow is not blocked by the bathymetry. The deep poleward undercurrent flows west around the eastern-most islands and north east of the Conception Bank to rejoin the intermittent branch that follows the African slope in the Lanzarote Passage. This hypothesis is consistent with the AAIW found west of Lanzarote, as far as 17 W. But also, this hypothesis would be coherent

  12. Coadaptation of Offspring Begging and Parental Provisioning - An Evolutionary Ecological Perspective on Avian Family Life

    OpenAIRE

    Natalia Estramil; Marcel Eens; Wendt Müller

    2013-01-01

    Offspring begging and parental provisioning are the two central social behaviours expressed during the period of parental care. Both behaviours influence each other and it is, therefore, hypothesized that they should ultimately become (genetically) correlated, stabilized by fitness costs to parents and/or offspring. By reciprocally exchanging entire clutches in canaries (Serinus canaria), we tested (1) whether there is covariation between these behaviours and (2) whether a mismatch - as intro...

  13. Motor-driven gene expression

    OpenAIRE

    Jarvis, Erich D; Nottebohm, Fernando

    1997-01-01

    There is increased neuronal firing in the high vocal center (a motor nucleus) and other song nuclei of canaries, Serinus canaria, and zebra finches, Taeniopygia guttata, whenever these songbirds sing or hear song. These observations suggested that song perception involved sensory and motor pathways. We now show that the act of singing, but not hearing song, induces a rapid and striking increase (up to 60-fold) in expression of the transcriptional regulator ZENK in the high vocal center and ot...

  14. Análisis geográfico de las relaciones comerciales exteriores de Canarias

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    Ramón Díaz Hernández

    2013-11-01

    Full Text Available Durante la década de los noventa, el comercio exterior de Canarias empieza a sentir los efectos de la incorporación de España a la Unión Europea (1986. La armonización de los mercados de destino y de origen, a resultas de este hecho, rompe poco a poco con las ventajas comerciales tradicionales de las Islas. Ello supone, a la vez, una mayor vinculación con Europa y un estrechamiento de los intercambios con el resto del Estado Español. No obstante, como resultado de una rica experiencia mercantil, el Archipiélago mantiene aún contactos comerciales con la mayor parte de los países y territorios de todos los continentes. Esa fortaleza patrimonial puede instrumentarse como plataforma de la Unión Europea en las relaciones Norte-Sur, pero también, como polo privilegiado en el comercio Sur-Sur, en la pugna por la expansión de los emergentes mercados del Hemisferio Sur.During the decade of the 1990s, foreign trade with the Canary 1slatids begins to feel the effects of Spain's incorporation into the European Community (1986. However, the coordination between foreign arid domestic markets has had little effect on the traditional commercial advantages of the Canary Islands. This implies, at the same time, a greater link with Europe and an increased exchange relationship with the rest of Spain. Nevertheless, as a result of a prosperous trading experience, the Canarian Archipelago still maintains commercial contacts with most of the countries in the world. This economic strength can be instrumental as a platform for the European Community in its relations between the North and the South. But, also, as a privileged pole in commerce within the South, in the struggle for expansion of the emerging markets in the Southern Hemisphere.

  15. CanariCam/GTC observations of (99942) Apophis

    CERN Document Server

    Licandro, J; Alvarez, C; Alí-Lagoa, V; Delbò, M

    2015-01-01

    The potentially hazardous asteroid (PHA) (99942) Apophis is one of the most remarkable near-Earth asteroids (NEA) in terms of impact hazard. A good determination of its surface thermal inertia is very important in order to evaluate the Yarkovsky effect on its orbital evolution. We present thermal infrared observations obtained on January 29, 2013, with CanariCam mid-infrared camera/spectrograph attached to the Gran Telescopio CANARIAS (GTC, Roque de los Muchachos Observatory, La Palma, Spain) using the Si2-8.7, Si6-12.5, and Q1-17.65 filters with the aim of deriving Apophis' diameter ($D$), geometric albedo ($p_V$), and thermal inertia ($\\Gamma$). We performed a detailed thermophysical model analysis of the GTC data combined with previously published thermal data obtained using Herschel Space Observatory PACS instrument at 70, 100, and 160 $\\mu$m.The thermophysical model fit of the data favors low surface roughness solutions (within a range of roughness slope angles $rms$ between 0.1 and 0.5), and constrains ...

  16. Islas de ida y vuelta. Canarias y El Caribe en contexto colonial

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    Ortiz García, Carmen

    2004-12-01

    Full Text Available On the presupposition that the conquest of the Canary Islands set the colonial stage for the later Spanish enterprises in the Americas, the author discusses a number of elements of identity shared by the islands of both the eastern Atlantic and the Caribbean. Sugar, the slave trade and the raising of bananas, cochineal and tobacco are the instances chosen for this comparative analysis. In addition, the author makes a reference to the legends of the apparition of the Virgin of Charity at El Cobre, in Cuba, and of Candlemas in Tenerife.

    Partiendo de la idea de que la conquista de las Islas Canarias fue el primer ensayo colonial de lo que luego desarrollarían los españoles en América, se examinan algunos elementos de identidad entre el mundo isleño atlántico y caribeño, producidos precisamente por esa situación inicial de dominio colonial. El azúcar, la trata de esclavos, los cultivos de plátano, grana y tabaco son los ejemplos escogidos para este análisis comparado. Finalmente se hace una referencia comparativa de las leyendas de la aparición de la Virgen de la Caridad del Cobre en Cuba y de la Virgen de Candelaria en Tenerife

  17. La serie de sellos de madera procedentes de Gáldar, Gran Canaria

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    Martín de Guzmán, Celso

    1988-12-01

    Full Text Available Pintaderas are a special type of wooden stamp from the Canary Islands. They are generally hypothesized to be owner's marks. This implies the existence of a flockowning aristocracy and a servile peasantry. This is strinkingly reminiscent of the sharply drawn class distinctions among the ancient inhabitants of the town of Galdar. These nobles attempted to preserve a pure lineage by practising endogamy. In any case, the most interesting aspect of this study is perhaps the possibility of drawing contrasts between conclusions arribed at through archaeological analysis and through ethnoarchaeological methods.

    Este tipo especial de sellos de madera son conocidos en la isla de Gran Canaria con el nombre «pintadera». De acuerdo con la hipótesis general pertenecían a esquemas o marcas de propietarios e implicarían una aristocracia ganadera y un campesinado diferenciado. Es altamente reminiscente de las distinciones de clase tan agudamente dibujadas entre los antiguos habitantes de la ciudad de Gáldar. Estos nobles trataron de preservar la línea pura por medio de la práctica de la endogamia. En cualquier caso, lo más importante de este estudio es quizá la posibilidad de contrastes entre el análisis arqueológico y el método etnoarqueológico.

  18. El agua en Canarias: una aproximación historiográfica

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    Pedro Luis Díaz Cruz

    2014-02-01

    Full Text Available El presente artículo efectúa un seguimiento sobre el del agua en Canarias y su progresiva privatizacióna través de una relación documental y su tratamiento historiográfico. La dinámica de estudio consistióbásicamente en el análisis de la bibliografía alusiva y la indagación archivística de fuentes menos utilizadaspara conformar, siguiendo una progresión cronológica, una aproximación al estado de la cuestión.Muestra la ubicación de distintas fuentes, a la vez que evidencia las líneas interpretativas quesustenta la historiografía al respecto. This article makes a follow-up about the water in the Canary Islands and its progressive privatizationthrough a document relation and its historiographic processinos. The dynamics of study consistedbasically of the allusive bibliography and registry sources less used to form, inquiry analysis followinga chronological progression, an approach to the State of the art. Shows the location of different sources,while evidence interpretative lines that sustains the historiography on the subject.

  19. Catálogo de los Halictini Halictus Latreille, 1804 y Lasioglossum Curtis, 1833 (Hymenoptera, Apoidea, Halictidae de la Península Ibérica y de las islas Canarias

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    Ornosa, C.

    2013-12-01

    Full Text Available The current work is a catalogue of the Halictini genera Halictus Latreille, 1804 and Lasioglossum Curtis, 1833 in the Iberian Peninsula and the Canary Islands. It includes the taxa, their synonymies, discussion, when necessary, and their geographic distribution as well (Tables 1, 2, 3 y 4. Some recent records of several species have been included too. The results (Table 1 indicate that this fauna is composed of 143 species and 161 subspecies: 126 appear in the Iberian Peninsula and 17 in the Canary Islands, where 6 of them and 17 subspecies are endemic, out of a total of 29 subespecies; 9 of the Canary species are present in both territories.En este catálogo se presenta un inventario actualizado de las especies de Halictini de los géneros Halictus Latreille, 1804 y Lasioglossum Curtis, 1833 de la Península Ibérica y de las Islas Canarias. Contiene 143 especies y 161 subespecies: 126 de las especies se conocen en la fauna ibérica y 17 en las Islas Canarias y, de estas, 6 especies y 17 subespecies son endémicas, de un total de 29 subespecies presentes en las islas; 9 de las especies canarias, son comunes a ambos territorios. De todos los taxones, además de la correspondiente discusión, si procede, se incluye su lista sinonímica y su distribución geográfica (Tablas 1, 2, 3 y 4. En algunas especies, se han incluido registros recientes que pueden resultar de interés.

  20. Some additions and corrections to the Coleoptera fauna of the Canary Islands

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    Machado, Antonio

    2014-06-01

    Full Text Available Two endomychid species described from El Hierro (Canary Islands are removed from the Canarian fauna: Dapsa hierrensis Franz, 1976 is a synonym of Archipines intricata (Gorham, 1889, nov. syn., and the single specimen (holotype was probably collected in Central America. Dapsa curta Franz, 1976 is also poorly described and based on a single female. Without a male it is not possible to assess with full confidence if it belongs to the African genus Danae or more probably to the Oriental genus Tragoscelis, and to which species. It is for sure not a Dapsa and its Canarian origin relates probably to another labeling error of the author, who also collected in Borneo, where this latter genus is present with 5 species. Consequently, Dapsa curta Franz, 1996 is proposed as nomen dubium. Furthermore, three genera are recorded for the Canaries for the first time: Silpha puncticollis Lucas, 1854 (Silphidae, the coffee bean borer Araecerus fasciculatus (DeGeer, 1775, and Bruchela rufipes (Olivier, 1790 both Anthribidae. Only the latter species can be considered as native; the other two are introduced recently and the Coffee bean weevil could become a pest.Dos especies de endomíquidos descritos de El Hierro (islas Canarias se eliminan de la fauna canaria: Dapsa hierrensis Franz, 1976 es una sinonimia posterior de Archipines intricata (Gorham, 1889, nov. syn., y el único ejemplar conocido (holotipo fue colectado probablemente en América Central. La descripción de Dapsa curta Franz, 1976 es muy pobre y se basa en una única hembra. Sin conocer el macho es imposible determinar con garantías si se trata del género Danae o, lo más probable, del género oriental Tragoscelis, o a cuál de sus especies pertenece, si no es nueva. Es seguro que no se trata de una Dapsa y el presunto origen canario radica seguramente en otro error de etiquetado del autor, que también colectó en Borneo, donde se conocen cinco especies de Tragoscelis. En consecuencia, se propone

  1. Vicia vulcanorum (Fabaceae a new species from the island of Lanzarote (Canary Islands

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    Morales-Mateos, J. B.

    2012-12-01

    Full Text Available Vicia vulcanorum J. Gil & M. L. Gil (Fabaceae, a new species of subg. Cracca (Dumort. Peterm., sect. Cracca Dumort. is described and illustrated from the island of Lanzarote, Canary Islands, north-west of Africa. It is related to and compared with Vicia cirrhosa C. Sm. ex Webb & Berthel. and Vicia filicaulis Webb & Berthel., two endemic species from the western and central group of the Canary Islands, and Vicia ferreirensis Goyder, an endemic species from Porto Santo Island, Madeira Archipelago.Se describe e ilustra Vicia vulcanorum J. Gil & M. L. Gil (Fabaceae, una nueva especie y endemismo de la isla de Lanzarote, Islas Canarias, perteneciente al subg. Cracca (Dumort. Peterm., sect. Cracca Dumort. Se encuentra relacionada y es comparada con Vicia cirrhosa C. Sm. ex Webb & Berthel. y Vicia filicaulis Webb & Berthel., especies endémicas de las islas centrales y occidentales del archipiélago canario, y con Vicia ferreirensis Goyder, especie endémica de la isla de Porto Santo, en el archipiélago de Madeira.

  2. Canarias: nacionalistas y comunistas contra la dictadura franquista (1959-1963. La visión de los protagonistas

    Directory of Open Access Journals (Sweden)

    Domingo Garí

    2014-02-01

    Full Text Available La oposición al franquismo tiene sus propias manifestaciones y ritmos en cada una de las naciones que componen el Estado español, aunque en todas encontremos similitudes y también complicidades. En el trabajo que presentamos aquí, analizamos como la tradición comunista y el nacionalismo emergente en Canarias tejen, no sin complicaciones, una renovada generación de líderes e impulsos políticos para afrontar la oposición al franquismo en sus últimos quince años. Los dirigentes que se forjaron a principios de los años sesenta, serán protagonistas de primera fila en el proceso de transición democrática iniciado con la muerte del dictador en 1975. Palabras Clave: franquismo, estado español, comunista, nacionalismo, Canarias, transición__________________Abstract:The opposition to Franco´s regime has its own manifestations and rythms in every one of the nations  the Spanish state consists of, even though we find similarities and complicities too. In the project that we present here, we analyse how the emergent communist tradition and the nationalism lead to, not without complications, a renewed generation of leaders and political impulses to confront the opposition to Franco´s regime in the last fifteen years. The leaders that were forged in the early seventies, were the main actors at the front line of the democratic transition that started with the death of the dictator in 1975.Keywords: franco’s regime, Spanish state, communist, nationalism, Canary Island, transition

  3. Incidentes en la zona aérea de Canarias y Africa occidental durante la II Guerra Mundial

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    Juan José Díaz Benítez

    2013-11-01

    Full Text Available La política exterior española durante la II Guerra Mundial empezó a virar hacia la neutralidad con la llegada de Gómez Jordana al Ministerio de Asuntos Exteriores en 1942. Sin embrago, la colaboración con el Eje, aún no concluida, provocó, fuertes presiones por parte de los aliados durante el resto de la guerra y alentó la sospecha de que aún continuaba el abastecimiento clandestino de submarinos alemanes en Canarias. Por ello. los aviones aliados sobrevolaron frecuentemente la Zona Aérea de Canarias y África Occidental entre principios de 1943 y el verano de 1944, provocando la reacción de las baterías de artillería antiaérea españolas e incluso la intervenci6n de los cazas con base en Gando. En ningún momento las fuerzas españolas intentaron derribar a los aviones aliados que atravesaban las aguas territoriales, sino sólo avisarlos para que se retiraran. No obstante, los aviones aliados persistieron, dando lugar a graves incidentes que estuvieron punto de ocasionar una fatalidad. Finalmente, las prolongadas gestiones diplomáticas emprendidas a finales de 1943 acabaron con estos incidentes, los cuales son un ejemplo olvidado de las tensas relaciones entre España y los aliados durante el declive del Eje.Spanish foreign policy through World War II turned to the way of neutrality after Gómez Jordana arrived at the Ministry of Foreign Affaires in 1943.  Howver, the persistent aid to tha Axis rose strong pressures by the Allies for the rest of the war and encouraged them for searching German U-boots at the Canary Islands. So Allied airplanes frequently flew over the Canary Islands and West Africa Aerial Zone between the beginning of 1943 and the summer of 1944, tempting the Spanish anti-aircraft batteries and the fighters based in Gaildo Gando reaction. The Spanish forces never tried to destroy the Allied aircrafts, but baut only warned them to keep away from yje Spanish aerial zone. Nevertheless, Allied planes still went on

  4. Native birds and insects, and introduced honey bees visiting Echium wildpretii (Boraginaceae) in the Canary Islands

    Science.gov (United States)

    Valido, Alfredo; Dupont, Yoko L.; Hansen, Dennis M.

    2002-12-01

    In this paper, we report observations of flower visitors of the endemic Echium wildpretii in Tenerife, Canary Islands. This plant inhabits the high altitudinal sub-alpine zone, which is characterized by a harsh climate, low species diversity and a short growing season. Echium wildpretii is a monocarpic perennial, producing a 2-3 m column-shaped, red-flowered, nectar-rich inflorescence. Although these floral traits have previously been suggested as being typical of ornithophilous flowers, this is the first study reporting observations of native birds ( Phylloscopus collybita and Serinus canarius) in addition to insects visiting the flowers for nectar. The purposes of this study were firstly to investigate levels of visitation by native birds, native insects, and introduced honey bees. Secondly, we studied the influence of floral display (plant height and number of flowers), nearest neighbours (distance and size) and local vegetation structure on visitation rate. Finally, we discuss the evolution of ornithophily in an otherwise entomophilous plant lineage. We found that the level of bird visitation was relatively high early in the flowering season, but decreased in mid/late season, while the opposite pattern was found for introduced honey bees. For native insects, the frequency of visits was similar in early and late season. Bird visits were correlated with floral display. In the early season, visitation rates of honey bees and the two most common native bee species were correlated with size of the plant or its nearest neighbours, consistent with preference patterns for larger resource patches. Since only insects visit the flowers of other species in the Echium clade, E. wildpretii appears to have evolved from a truly insect-pollinated lineage.

  5. Pronounced fixation, strong population differentiation and complex population history in the Canary Islands blue tit subspecies complex.

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    Bengt Hansson

    Full Text Available Evolutionary molecular studies of island radiations may lead to insights in the role of vicariance, founder events, population size and drift in the processes of population differentiation. We evaluate the degree of population genetic differentiation and fixation of the Canary Islands blue tit subspecies complex using microsatellite markers and aim to get insights in the population history using coalescence based methods. The Canary Island populations were strongly genetically differentiated and had reduced diversity with pronounced fixation including many private alleles. In population structure models, the relationship between the central island populations (La Gomera, Tenerife and Gran Canaria and El Hierro was difficult to disentangle whereas the two European populations showed consistent clustering, the two eastern islands (Fuerteventura and Lanzarote and Morocco weak clustering, and La Palma a consistent unique lineage. Coalescence based models suggested that the European mainland forms an outgroup to the Afrocanarian population, a split between the western island group (La Palma and El Hierro and the central island group, and recent splits between the three central islands, and between the two eastern islands and Morocco, respectively. It is clear that strong genetic drift and low level of concurrent gene flow among populations have shaped complex allelic patterns of fixation and skewed frequencies over the archipelago. However, understanding the population history remains challenging; in particular, the pattern of extreme divergence with low genetic diversity and yet unique genetic material in the Canary Island system requires an explanation. A potential scenario is population contractions of a historically large and genetically variable Afrocanarian population, with vicariance and drift following in the wake. The suggestion from sequence-based analyses of a Pleistocene extinction of a substantial part of North Africa and a Pleistocene

  6. Seasonal cycle of the Canary Current.

    Science.gov (United States)

    Vélez-Belchí, P.; Hernandez-Guerra, A.; Pérez-Hernández, M. D.

    2015-12-01

    The Atlantic meridional overturning circulation (AMOC) is recognized as an important component of the climate system, contributing to the relatively mild climate of northwest Europe. Due to its importance, the strength of the AMOC is continually monitored along 26ºN with several moorings east of the Bahamas, in the Middle Atlantic Ridge and south of the Canary islands, known as the RAPID array. The measurements of the RAPID array show a 6 Sv seasonal cycle for the AMOC, and recent studies have pointed out the dynamics of the eastern Atlantic as the main driver for this seasonal cycle, specifically, rossby waves excited south of the Canary Islands. Due to the important role of the eastern Atlantic, in this study we describe the seasonal cycle of the Canary Current (CC) and the Canary Upwelling Current (CUC) using hydrographic data from two cruises carried out in a box around the Canary Islands, the region where the eastern component of the RAPID array is placed. CTD, VMADCP and LADCP data were combined with inverse modeling in order to determine absolute geostrophic transports in the Canary Islands region in fall and spring. During spring, the overall transport of Canary Current and the CUC was southward. In the Lanzarote Passage (LP), between the Canary Islands and Africa, the CUC transported 0.6±0.20 Sv southward, while the Canary Current transported 1.0±0.40 Sv in the oceanic waters of the Canary Islands Archipelago. During fall, the CUC transported 2.8±0.4Sv northward, while the CC transported 2.9±0.60 Sv southward in the oceanic waters of the Canary Islands Archipelago. The seasonal cycle observed has an amplitude of 3.4Sv for the CUC and 1.9Sv for the CC. Data from a mooring in the LP and the hydrographic data was used to calibrate geostrophic transport estimated using altimetry data. The amplitude of the seasonal cycle of the geostrophic transport obtained using the calibrated altimetry data (Figure 1) was quite similar to the seasonal cycle of the

  7. Sex determination by discriminant function analysis of the right tibia in the prehispanic population of the Canary Islands.

    Science.gov (United States)

    González-Reimers, E; Velasco-Vázquez, J; Arnay-de-la-Rosa, M; Santolaria-Fernández, F

    2000-02-28

    This study has been performed in order to define standards usable to determine the sex of prehispanic individuals from the Canary Islands from their skeletal remains. Osteometric information at the right tibia was obtained from 59 complete skeletons from Gran Canaria, housed in the Museo Canario (Las Palmas), 45 males and 14 females (this constitutes the totality of complete prehispanic skeletons known from Gran Canaria). The parameters measured were: tibial length, proximal and distal epiphyseal breadth, transverse and anteroposterior diameter, perimeter at the nutrition foramen levels and minimum shaft perimeter. These parameters were subjected to different SPSS discriminant function analysis, combining all of them, or only the proximal or distal ones, without tibial length, etc., in order to obtain functions usable even if only bone fragments are available. Transverse diameter, proximal epiphyseal breadth and minimum shaft perimeter showed the highest discriminant power. The functions obtained showed high average accuracies, ranging from 94.9 to 98.3%, with female accuracies of 100%. The functions obtained were further applied to a test prehispanic population (ten males and ten females) from El Hierro. Overall accuracies of the functions when applied to this population ranged from 65 to 94.7%, with female accuracies ranging 80% to 100%.

  8. Diversity, rarity and the evolution and conservation of the Canary Islands endemic flora

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    Reyes-Betancort, J. Alfredo

    2008-06-01

    Full Text Available The endemic vascular flora of the Canary Islands comprises over 680, taxa collectively accounting for more than 50% of the total native flora. To investigate geographical patterns of diversity within the endemic flora, distribution data from published sources together with other field observation and herbarium data were used to compile a data matrix comprising the distributions of ca. 90% of endemic taxa scored on a 10 × 10km UTM grid. WORLDMAP was then used to investigate patterns of endemic diversity, range size rarity (a measure of endemicity, phylogenetic diversity and threatened taxon richness. Endemic taxon richness was found to be highly heterogeneous across the archipelago, with cells containing between one and 139 taxa each (0.05-22.82% of endemic diversity. Patterns of variation in range size rarity and phylogenetic diversity were found to be largely congruent with endemic diversity, although some cells exhibited markedly higher range size rarity scores than would be predicted by their endemic diversity scores. In contrast, the pattern of endangered taxon richness across the archipelago differed markedly from endemic taxon richness. Many cells in Lanzarote, Fuerteventura and Gran Canaria exhibit higher endangered taxon richness scores than would be predicted from their endemic richness scores whereas in Tenerife, El Hierro, La Palma and La Gomera, the converse is generally true. The implications of the results both for understanding the evolution of Canary Island endemic diversity and for the conservation of the region’s unique and vulnerable flora are considered.La flora vascular endémica de las Islas Canarias comprende unos 680 táxones, lo que viene a representar más del 50% de la flora nativa. Con objeto de investigar patrones geográficos de diversidad en la flora endémica, se recopilaron los datos publicados que, junto con otras observaciones de campo y datos de herbario, sirvieron para completar una matriz de datos

  9. Estudio micológico de El Canal y Los Tiles (La Palma, Islas Canarias. V. Datos adicionales

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    Leal, Julio

    2009-12-01

    Full Text Available An annotated catalogue of 66 taxa, collected in the early MAB Reserve El Canal y Los Tiles is presented. Among these taxa, 11 species are new for La Palma island and 5 are recorded for the first time in the Canary Islands. Taxonomic comments on some critical species and information about the distribution in the Macaronesian bioregion of all the studied taxa are given. Based on our previous publications, global data on biodiversity, substrates and distribution of the mycobiota in the different plant communities present in the sampled area are analyzed.

    Se presenta un estudio sobre 66 especies, pertenecientes a las divisiones Myxomycota (21, Ascomycota (29 y Basidiomycota (16, encontradas en la antigua Reserva de la Biosfera El Canal y Los Tiles. De ellas 11 se citan por primera vez para la isla de La Palma, siendo 5 de éstas nuevas para Canarias. Se hacen comentarios taxonómicos sobre algunos táxones conflictivos, además de amplia información sobre su distribución en la Región Macaronésica. En base a publicaciones propias anteriores, se aportan datos globales sobre biodiversidad, sustratos y distribución de la micobiota en las diferentes unidades ambientales presentes en el área de estudio.

  10. [Prevalence of eating disorders in adolescents from Gran Canaria].

    Science.gov (United States)

    Álvarez-Malé, María Luisa; Bautista Castaño, Inmaculada; Serra Majem, Lluis

    2015-05-01

    Objetivos: evaluar la prevalencia de trastornos de la conducta alimentaria en estudiantes con edades comprendidas entre los 12 a 20 años mediante medidas estandarizadas. Material y métodos: se seleccionaron al azar un total de 1342 participantes de centros educativos de la isla de Gran Canaria, España. Se empleó un diseño transversal de dos fases que incluía un primer cuestionario de cribado (EAT-40 con el punto de corte establecido en 20) y una entrevista clínica semi-estructurada (EDE). También se evaluaron variables sociodemográficas y el estado ponderal de los alumnos. Resultados: en el año 2013 estudiamos a participantes de 15 centros educativos de Gran Canaria. En la primera fase se halló una prevalencia de riesgo de 27,42% (33% de mujeres, 20,6% de hombres). En la segunda fase, 538 participantes accedieron a ser evaluados mediante entrevista clínica (285 en riesgo, con altas puntuaciones en el EAT; 253 seleccionados del grupo sin riesgo). La prevalencia global de trastorno de la conducta alimentaria fue de 4,11% (5,46% de mujeres, 2,55% de hombres). Empleando los criterios diagnósticos del DSM-IV-TR, la prevalencia para la anorexia nerviosa fue de 0,19%, para la bulimia nerviosa de 0,57% y para el trastorno de la conducta alimentaria no especificado de 3,34%. Conclusiones: la prevalencia diagnóstica de trastornos de la conducta alimentaria en Gran Canaria es similar a la del resto de España. Sin embargo, la prevalencia de riesgo de desarrollar dichos trastornos es especialmente elevada en Gran Canaria, teniendo en cuenta los datos de estudios tanto nacionales como internacionales.

  11. La presencia canaria en Matanzas desde 1765 a 1909

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    Velgis Cardero Garcés

    2010-10-01

    Full Text Available La inmigración canaria a Matanzas se caracterizó, como otros movimientos poblacionales, por el predominio masculino. Esto se ratifica en los tres tipos de documentos analizados, en los que las personas de origen canario registradas eran fundamentalmente hombres. A pesar de ello, las cifras indicadas en el registro de matrimonios nos hacen estimar que las diferencias entre los por cientos de personas de cada sexo que arribaron a esta ciudad procedentes de Islas Canarias no son tan considerables como entre las provenientes de otras regiones de España. Matanzas albergó sucesivamente a inmigrantes de diversas procedencias que conformaron, en definitiva, al hombre de hoy. La mezcla de nacionalidades en la identidad nacional  -lo cual no constituye particularidad alguna dentro del desarrollo de la humanidad-  perfiló al cubano actual, fruto del español, el africano y el chino, por mencionar las de mayor influencia. Pero siempre, al esbozarse una historia de la ciudad, será ineludible remontarse a la treintena de familias canarias que, alrededor de ríos y bahía, construyeron sus hogares y al originar descendencia alumbraron, de hecho, a quienes primero tuvieron el orgullo de proclamarse matanceros. 

  12. Finnish travelers' travel motivation : case: Canary Islands

    OpenAIRE

    Jokilehto, Katri

    2012-01-01

    The aim of the thesis was to study the travel motives which lead Finnish people to travel to the Canary Islands and other factors which impact on the holiday decision process and destination choice. The target group for the research was Finnish people and the aim was to study the travel motives of Finns to the Canary Islands and which factors are important for Finnish people to gain a successful holiday. The research was conducted by using internet survey and the collected data was analyzed b...

  13. Holocene geomagnetic field intensity variations: Contribution from the low latitude Canary Islands site

    Science.gov (United States)

    Kissel, C.; Laj, C.; Rodriguez-Gonzalez, A.; Perez-Torrado, F.; Carracedo, J. C.; Wandres, C.

    2015-11-01

    New absolute paleomagnetic intensity (PI) are investigated from 37 lava flows located at Tenerife and Gran Canaria (Canary Islands). They complete previously published directional results from the same flows and therefore allow to examine the time variations of the full geomagnetic vector. Twenty-eight flows are radiocarbon dated between 1706 AD and about 13 200 BC and one is historical. Eight other flows are not dated but they have stratigraphic links with the dated flows and archeomagnetic ages had been attributed to them based on their paleomagnetic directions. Various mineralogical analyses were conducted, giving access to the nature of the magnetic minerals and to their grain size. We performed the original Thellier and Thellier paleointensity (PI) experiments with a success rate of about 65% coupling this experiment with the strict set of selection criteria PICRIT-03. The mean PIs at the flow level are based on 3 to 12 independent PI determinations except for one site in which only one reliable determination could be obtained. The data indicate some variability in the local field intensity with a prominent PI peak centered around 600 BC and reaching 80 μT (VADM 16 ×1022 Am2), documented for the first time in this region. Combined with the published data obtained from western Africa, Spain, Portugal, Morocco and the Azores within a 2000 km-radius around the Canary Islands, our data allow to construct a curve illustrating the Earth magnetic field intensity fluctuations for Southwestern Europe/Western Africa. This curve, compared to the one produced for the Middle East and one calculated for Central Asia shows that maximum intensity patches have a very large geographical extent. They do not yet appear clearly in the models of variations of the dipolar field intensity.

  14. The water landscapes of the Canary Islands

    DEFF Research Database (Denmark)

    Lee, Gini; Braae, Ellen Marie; Diedrich, Lisa

    2013-01-01

    Island environments, particularly small archipelagos such as the Canary Islands, are more visible subject to the vagaries of change wrought by ecological and climate dynamics, shifting social conditions and economic impacts subject to global markets, than is witnessed on continental worlds....

  15. Consideraciones en torno a los sistemas productivos de las sociedades prehistóricas canarias: los modelos de Tenerife y Gran Canaria

    Directory of Open Access Journals (Sweden)

    Javier Velasco Vázquez

    2013-11-01

    Full Text Available En el presente trabajo se analizan diversos aspectos de los sistemas productivos aborígenes de Tenerife y Gran Canaria y su incidencia en la organización socioeconómica de ambas formaciones.In this paper we aim to analyse some aspects about aborigine productive systems of Tenerife and Gran Canaria and their incidence in the socioeconomic organisation of these communities.

  16. Obesidad infantil y juvenil en la Comunidad Canaria

    OpenAIRE

    Elustondo Elizalde, Hidatsa

    2014-01-01

    En este trabajo, voy a desarrollar un tema que se encuentra de actualidad en nuestra sociedad; Es el tema relacionado con la obesidad infanto-juvenil, pero delimitado al territorio de la Comunidad Canaria. En el trabajo abordaré cuales son las causas de cifras tan elevadas de obesidad en la comunidad, los factores implicados y para finalizar, realizaré un plan de actuación para su implantación escolar donde aparecerán temas como el de la alimentación equilibrada y saludable, y el ejercicio...

  17. Patterns of plankton communities in subtropical waters off the Canary Islands during the late winter bloom

    Science.gov (United States)

    Schmoker, Claire; Ojeda, Alicia; Hernández-León, Santiago

    2014-01-01

    The microbial planktonic community of the subtropical waters around Gran Canaria Island, Canary Islands, was studied before, during and after the typical late winter bloom. The study consisted of a weekly sampling from October 2005 to June 2006 at five stations. Abundances and biomass of heterotrophic prokaryotes, small autotrophic plankton (picoplankton 0.2-2 μm in ESD), heterotrophic and autotrophic nanoflagellates (nanoplankton mainly in the range of 3-4 μm in ESD), microzooplankton (mainly ciliates and dinoflagellates 15-200 μm in ESD) and mesozooplankton (> 200 μm in ESD) were estimated in order to know the effect of the winter mixing. During all the period of study, microplankton abundance was dominated by small athecate dinoflagellates (15-20 μm in ESD) whereas its biomass was dominated by aloricate ciliates (20-30 μm and > 40 μm in ESD). The bloom began with the increase of autotrophic picoplanktonic cells and small diatoms. Consecutively, nano-, micro-, and mesozooplankton biomass also increased. During the development of the winter bloom, picoplankton, heterotrophic nanoflagellates, microzooplankton, mainly aloricate ciliates, and mesozooplankton showed inverse trends suggesting that the bloom is a succession of complex top-down controls.

  18. Observations of the Lensed Quasar Q 2237+0305 with CanariCam at GTC

    CERN Document Server

    Vives-Arias, H; Kochanek, C S; Mediavilla, E; Jimenez-Vicente, J

    2016-01-01

    We present new mid-IR observations of the quadruply lensed quasar Q 2237+0305 taken with CanariCam on the Gran Telescopio Canarias (GTC). Mid-IR emission by hot dust, unlike the optical and near-IR emission from the accretion disk, is unaffected by the ISM (extinction/scattering) or stellar microlensing. We compare these "true" ratios to the (stellar) microlensed flux ratios observed in the optical/near-IR to constrain the structure of the quasar accretion disk. We find a half-light radius of $R_{1/2}=3.4_{-2.1}^{+5.3}\\sqrt{\\langle M \\rangle/0.3M_\\odot}$ light-days at $\\lambda_{rest}=1736$ \\AA, and an exponent for the temperature profile $R \\propto \\lambda^{p}$ of $p=0.79\\pm0.55$ where $p=4/3$ for a standard thin disk model. We find a lower limit for the size of the mid-IR emitting region of $R_{1/2} \\gtrsim 200\\,\\sqrt{\\langle M \\rangle/0.3M_\\odot}$ light-days. We also test for the presence of substructure/satellites by comparing the observed mid-IR flux ratios with those predicted from smooth lens models. We...

  19. La jerarquía y el sistema urbano de Canarias durante el Antiguo Régimen

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    Pedro C. QUINTANA ANDRÉS

    2009-12-01

    Full Text Available RESUMEN: El organigrama y la jerarquía urbana en las Islas Canarias se encuentran mediatizadas por la estructura económica y el desarrollo de la formación social regional. El fraccionamiento del espacio, la dependencia exterior, la posición geoestratégica internacional o las reiteradas alternativas en la potenciación de diversos productos de exportación fueron los que marcaron, a grandes rasgos, las principales características del sistema urbano canario. La ciudad surge allí donde se asientan los órganos del poder que representan a la Corona, la Iglesia y a la población (Cabildo, Obispado, Real Audiencia, Capitán General, asumiendo gran parte de las funciones demandadas por los vecinos de toda la región. A su vez, una alícuota parte de su población será la que acumule y redistribuya las rentas generadas, beneficiando a esta oligarquía local compuesta por grandes comerciantes extranjeros, hacendados y eclesiásticos que integran el Cabildo Catedral. Palabras clave: Islas Canarias, España, sistema social urbano, oligarquía local, comerciantes extranjeros, Cabildo Catedralicio.ABSTRACT: The chart and the urban hierarchy in the Canary Islands are mediatized by the economic structure and the development of social and regional formation. The division of the space, the external dependence, the geostrategic international position or the reiterated choices, giving the power to different export products, marked to a great extent the main characteristic of the cañarían urban system. The city appears where the différents parts of power are settled so they represent the Crown, the Church and the population (Inter-island Council, Bishopric, County Court, Field Marshal, also this city assumes the majority of functions requested by neighbours from all the regions. At the some time, an aliquot part of population will accumulate and distribute the generated incomes in favour of this local oligarchy constituted by great foreing merchants

  20. Críticas al exceso de clero en las Canarias de los Austrias

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    Esteban Alemán Ruiz

    2013-11-01

    Full Text Available Las quejas por el crecimiento desproporcionado del clero bajo los AUstrias no fueron privativas de los reinos peninsulares de la Corona de Castilla. En Canarias también las hubo, aunque la voces contrarias d Id proliferación de conventos y monasterios y -en menor medida- a la amorti7ación de la tierra, se escucharon comparativamente tarde (después del primer tercio del XVII y, sobre todo, en la segunda mitad del siglo. Al igual que en otros territorios de la Monarquía hispánica, la crítica procedió del mundo seglar, pero también de dentro del propio estamento eclesiástico. La protesta del primero se organizó en torno a los concejos o cabildos insulares (aunque no faltó la del vecindario sin mediación institucional, a la cabeza de todos el de Tenerife, isla que contaba con el clero secular más numeroso del Archipi6lago y donde se fundó la mayor cantidad -con diferencia- de casas de religión. También el episcopado, el cabildo catedralicio y el clero parroquia se opusieron a lo que entendían como un aumento desmedido de la fundaciones del clero regular, en ocasiones en perfecta sintonía con las autoridades seglares, si bien su comportamiento no se comprende al margen de la conflictividad intestina del estamento (lo cual, sumado a la competencia por la captación de limosnas y rentas, explica las críticas vertidas por unas órdenes religiosas contra otras. El estudio de estas posturas -y de los casos particulares a través de los cuales se manifestaron habitualmente- apenas si puede ser esbozado, dado el estado actual de nuestros conocimientos sobre el tenia. No obstante, todo apunta a que semejante conciencia de saturación obedeció -en parte, al menos- a un crecimiento del clero en las Islas desequilibrado desde los puntos de vista demográfico, económico y espacial.The complaints due to the desproptionate increasement of fhe clergy in the reign of the Spanish Habsburgs were not exclusive of the territories in the mainland of

  1. Marineros extranjeros en los protocolos notariales de Gran Canaria (1590-1599

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    María Berenice Moreno Florido

    2013-11-01

    Full Text Available Este trabajo de investigación pretende un análisis detallado y riguroso que nos ayude a tener un mayor conocimiento de la sociedad canaria y sobre todo de su relación con el exterior, centrándonos en el Atlántico europeo. De esta manera consideramos que se trata de una aportación más para el entendimiento profundo del Archipiélago canario durante el Antiguo Régimen. En este sentido debemos señalar que no existe un estudio de estas características que relacione la actividad de los marineros extranjeros y su actuación intrínseca con el comercio así como la vida de éstos y su entorno. Por este motivo hemos decidido realizar un análisis que abarque cada uno de los aspectos que podemos entresacar de la fuente empleada, los protocolos notariales. Del mismo modo el periodo escogido, 1590-1599, radica en la influencia de la política filipina en una época llena de hostilidades y decadencia para el Estado español. Así nos hemos centrado en la última etapa del reinado de Felipe II mostrando una década de contrabando y actividad pirática y corsaria de manera acusada en el Archipiélago canario. Asimismo a esta circunstancia debemos añadir las cuestiones religiosas caracterizadas por la extensión del protestantismo en Europa y la consecuente actuación del Concilio de Trento junto a la actividad inquisitorial que se tornará cada vez más rígida, fundamentalmente en los lugares de fronteras como es el caso isleño. Igualmente es importante tener en cuenta que la actividad económica se conforma como pilar del desarrollo y la evolución socio-económica de las Islas, sobre todo en su papel de enlace entre Europa, África y América.This research pretends to be a rundown and rigorous analysis that help us to have a better knowledge of the Canarian Society, and over all, its relationship with the outer, principally in the Europe Atlantic Ocean. In this way, we consider that it is another contribution for the deep understanding of the

  2. Cuba, Canarias y la prensa, en el contexto del 98

    Directory of Open Access Journals (Sweden)

    Lic. Ileana Medina Hernández

    1998-01-01

    Full Text Available 1898 es para España el año del Desastre, con mayúscula; 1898 es para Cuba el año de la independencia, quizá con minúscula. Canarias es la puerta de salida de Europa; Cuba es puerta la entrada de América. La migración canario - cubana ha sido un factor histórico decisivo en la formación de ambas nacionalidades. La prensa de masas naciente a fines del siglo XIX jugó un papel determinante en la guerra hispano-norteamericana y su desenlace. Conjugando esas cuatro sentencias aplastantes y archiconocidas, la investigación del reflejo del proceso independentista cubano en la prensa de canaria aporta sustanciosos elementos al conocimiento del papel de los procesos de comunicación en la historia y en la cultura de ambos archipiélagos, en el importante contexto del fin de siglo XIX.

  3. territorial de la población de Canarias

    Directory of Open Access Journals (Sweden)

    Antonio Álvarez Alonso

    2005-01-01

    Full Text Available Este artículo tiene como objetivo analizar el crecimiento y los desplazamientos experimentados por la población de Canarias durante las dos últimas décadas del siglo XX, período en el que el Archipiélago transformó su modelo de desarrollo económico y demográfico. Durante aquellos años el crecimiento demográfico de Canarias fue del doble de la media española, consecuencia de un proceso de carácter inmigratorio jamás conocido. Tal crecimiento afectó de manera desigual a las islas, habiendo alcanzado alguna de ellas tasas anuales diez veces superiores a la media estatal. Al mismo tiempo, se ha producido también un importante desequilibrio en la distribución espacial de la población, pues han crecido muchos los sures, menos los nortes y se han estancado las áreas metropolitanas. A su vez, se han vaciado demográficamente los núcleos de las medianías de los sures a favor de los litorales, consecuencia del cambio del modelo agropecuario por el turístico.

  4. El oficio de los neveros en Gran Canaria en el siglo XVIII

    OpenAIRE

    Salvador Miranda Calderin

    2003-01-01

    A finales del s. XVII el Cabildo Catedral de Canarias, con sede en la capital de Gran Canaria, construyó en la cumbre de la Isla dos pozos de nieve. Allí la recogían y conservaban hasta que era transportada en verano a la ciudad. Las libras de nieve se vendieron en la «nevería» ubicada en la trasera de la Catedral desde 1694 hasta 1866. En este artículo estudiamos el oficio de nevero en Gran Canaria, que había sido olvidado por completo, sus salarios, alimentación y especialidades en el s. XV...

  5. Las revistas científicas de Historia publicadas en Canarias: a propósito de Vegueta (1992-2003

    Directory of Open Access Journals (Sweden)

    Manuel Ramírez Sánchez

    2013-10-01

    Full Text Available Se analiza la problemática actual de las publicaciones científicas especializadas en Historia que se editan en Canarias, que, aunque aparecen indexadas en algunas bases de datos y directorios de publicaciones periódicas, carecen de una visibilidad que vaya más allá del ámbito estrictamente regional. La creciente implantación de modelos de evaluación de la investigación en las áreas de Humanidades y Ciencias Sociales que, entre otras cosas, priorizan la publicación de la investigación científica en revistas competitivas, supone un serio inconveniente para la supervivencia de estas revistas. Tomando como ejemplo la revista Vegueta: Anuario de la Facultad de Geografía e Historia de la Universidad de Las Palmas de Gran Canaria, se analiza el grado de cumplimiento de los estándares internacionales en materia de publicaciones científicas periódicas, al tiempo que se proponen una serie de mejoras que, en caso de aplicarse, mejorarían notablemente su calidad editorial y permitirían la inclusión de la revista en las principales bases de datos españolas e internacionales.In this essay, we will analyse the problems History Reviews published in the Canary Islands are facing now. Though some of these reviews appear indexed in some data bases and listings of publications, they are virtually unknown beyond their region. The progressive implementation of parameters to evaluate the quality of research in the fields of Humanities and Social Sciences, those, which come to priorize publication of scientific research in competitive reviews, will make the future of these reviews turn bleak. We will analyse whether Vegueta: Anuario de la Facultad de Geografía e Historia de la Universidad de las Palmas de Gran Canaria, a review we have taken as sample, meets the international criteria for publication. We also attempt to make a series of suggestions which, if taken into consideration, may help to improve its quality as a publication allowing it to

  6. The Canarias Einstein ring: a newly discovered optical Einstein ring

    Science.gov (United States)

    Bettinelli, M.; Simioni, M.; Aparicio, A.; Hidalgo, S. L.; Cassisi, S.; Walker, A. R.; Piotto, G.; Valdes, F.

    2016-09-01

    We report the discovery of an optical Einstein ring in the Sculptor constellation, IAC J010127-334319, in the vicinity of the Sculptor dwarf spheroidal galaxy. It is an almost complete ring (˜300°) with a diameter of ˜4.5 arcsec. The discovery was made serendipitously from inspecting Dark Energy Camera (DECam) archive imaging data. Confirmation of the object nature has been obtained by deriving spectroscopic redshifts for both components, lens and source, from observations at the 10.4 m Gran Telescopio CANARIAS (GTC) with the spectrograph OSIRIS. The lens, a massive early-type galaxy, has a redshift of z = 0.581, while the source is a starburst galaxy with redshift of z = 1.165. The total enclosed mass that produces the lensing effect has been estimated to be Mtot = (1.86 ± 0.23) × 1012 M⊙.

  7. Evolución del ADN mitocondrial en lagartijas de las Islas Canarias

    OpenAIRE

    Pestano-Brito, José J.

    1998-01-01

    [ES] Estudio preliminar del ADN mitocondrial de Chalcides Sexlineatus y Chalcides Viridanus, para su posterior comparación con el patrón morfológico que presentan en las islas de Gran Canaria y Tenerife respectivamente.

  8. Stygofauna of the Canary Islands, 9. The amphipod genus Pseudoniphargus (Crustacea) in the Canary Islands

    NARCIS (Netherlands)

    Stock, Jan H.

    1988-01-01

    Pseudoniphargus was known from inland stygohabitats in the Iberian peninsula, the Azores, Madeira, N.W. Africa, and Bermuda, but not from the Canary Islands. Systematic sampling in six of the seven larger islands of the latter archipelago has revealed the presence of the genus in Tenerife (4 species

  9. The Continuous Presence of News in the Ballad Tradition of the Canary Islands

    Directory of Open Access Journals (Sweden)

    Monroy Caballero, Andrés

    2008-12-01

    Full Text Available The author approaches the textual study of the oral tradition of ballads in the Canary Islands by focusing on the imprints left on these compositions by the events of History, Big and Small. Known as “Noticierismo”, this expression of popular culture —that of inserting historical news in such texts— has existed in the Islands for quite a long time. By considering the different ballad genres and revealing that noticierismo can be traced back to the late Middle Ages, he argues that its primary function, both in the Islands and elsewhere in the Spanish-speaking world, especially with regard to the 18th Century-like compositions, has been that of spreading the word about those events from the past which most impressed its practitioners. From one generation to the next, the centuries-old tradition has kept the memory of such events alive to the present day.

    Nos acercamos al estudio textual del romancero recogido en la tradición oral de Canarias a través de las huellas que la pequeña o gran historia ha ido perpetuando en estas composiciones, como reflejo de la continuación de la práctica del noticierismo romancístico desde finales de la Edad Media hasta la actualidad. Mediante el análisis de los géneros romancísticos y la persistencia de esta tendencia noticiera en los textos, demostramos que el romancero noticiero en Canarias —y en el mundo hispánico en general— ha estado muy activo (sobre todo en los pliegos dieciochescos, modernos y locales, con la función primordial de dar publicidad a aquellos acontecimientos que más impresionaron en una época pretérita y que se han mantenido vigentes hasta la actualidad gracias a la labor de conservación de sus transmisores.

  10. Fábrica para Frigo-Canarias, S.A. en Jinamar (Teide Gran Canaria – España

    Directory of Open Access Journals (Sweden)

    López Díaz, Luis

    1974-06-01

    Full Text Available This building is situated in Janamar (Telde, Las Palmas in Gran Canaria and to accomplish it the valuable experiences have been utilised that Frigo has collected from its other important factories, foreseeing possible enlargements, rational organization of the operational cycle and easy checking of the whole system of ducts. It has offices, wardrobes and staff diningroom, separate W.C.'s for ladies and gentlemen, fabrication zone, storage, maturation tanks, freezers, cold storage rooms, loading piers, etc. Mention should be made of the hyperbolic paraboloids of reinforced concrete that cover the storage house for cartonnage, for raw material and the big central bay as well as the steam kettle room in the shape of a revolving hyperboloid and glass cover.Este edificio está situado en Jinamar (Telde, Las Palmas de Gran Canaria, y para su organización se han recogido las valiosas experiencias que Frigo ha deducido de sus otras fábricas importantes, previendo posibles ampliaciones, organización racional del ciclo operativo y comodidad de control de todas las canalizaciones. Dispone de oficinas, vestuarios y comedor de empleados, aseos para ambos sexos, zona de fabricación, almacenes, tanques de maduración, congeladores, cámaras frigoríficas, muelles de carga, etc. Son de destacar los paraboloides hiperbólicos de hormigón armado que cubren el almacén de cartonaje, el de materias primas y la gran nave central, así como la cámara de calderas de vapor con forma de hiperboloide de revolución y cubierta de cristal.

  11. Upgrated fuel from reed canary grass

    Energy Technology Data Exchange (ETDEWEB)

    Oravainen, H. [VTT Energy, Jyvaeskylae (Finland)

    1997-12-01

    Results described in this presentation are from a large EU-project - Development of a new crop production system based on delayed harvesting and system for its combined processing to chemical pulp and biofuel powder. This is a project to develop the use of Reed Canary Grass (Phalaris Arundinaceae) both for pulp industry and energy production. The main contractor of the project is Swedish University of Agricultural Sciences (coordinator), task coordinators are United Milling Systems A/S from Denmark, and Jaakko Poeyry Oy and VTT Energy from Finland In addition, there are partners from several countries participating in the project

  12. Andromonoecy and buzz pollination in Solanum species (Solanaceae endemic to the Canary Islands

    Directory of Open Access Journals (Sweden)

    Dupont, Yoko Luise

    2006-06-01

    Full Text Available We investigated the pollination and reproductive biology of two Canary Island endemics, Solanum vespertilio and S. lidii (Solanaceae. We measured male function (pollen development, female function (fruit initiation and spatial arrangement of reproductive parts within flowers and inflorescences. Furthermore, we observed flower visitors and monitored visitation rates. Both species of Solanum display andromonoecy: Longstyled flowers are functionally hermaphrodite and borne proximally on the inflorescences, while short-styled flowers are functionally male and borne distally on inflorescences. Large bees capable of buzzing were the main flower visitors. In particular, the endemic Canarian bumblebee, Bombus terrestris canariensis, was a frequent visitor and pollen vector of S. vespertilio.Se estudiaron la polinización y biología reproductiva de dos especies endémicas de las Islas Canarias: Solanum vespertilio y S. lidii (Solanaceae. Se midieron la función masculina (desarrollo polínico, la función femenina (iniciación de fruto y la disposición espacial de los órganos reproductivos, tanto en las flores como en las inflorescencias. Se registraron además los visitantes de las flores y su frecuencia. Ambos Solanum son andromonoicos: las flores con estilo largo son funcionalmente hermafroditas y proximales en las inflorescencias, mientras que las flores con estilo corto son funcionalmente masculinas y distales en la inflorescencia. Los visitantes más asiduos fueron grandes abejas y abejorros zumbadores. El abejorro endémico Bombus terrestris canariensis, en particular, fue un visitante frecuente y un vector de polen para S. vespertilio.

  13. Family influences in academic achievement. A study of the Canary Islands

    Directory of Open Access Journals (Sweden)

    Pérez Sánchez, Carmen Nieves

    2013-04-01

    Full Text Available In this paper we study the family variables affecting academic achievement within a Canary Island sample. Parents’ level of education, parents’ expectations about academic achievement, Socioeconomic Status (SES, family size, type of family and parents’ control over the student’s homework are used as predicting variables in a logistic regression for predicting which variables load in high academic achievement. These variables are incorporated into two different theoretical models: the social capital view of Coleman and the cultural capital view of Bourdieu. The results indicate that the variables having a leading role are parents’ expectations, parents’ education, SES and family size.

    En este artículo estudiamos los efectos de las variables relacionadas con la familia en el rendimiento académico en una muestra de estudiantes de Canarias. A través de una regresión logística evaluamos el peso de las siguientes variables en el rendimiento académico: el nivel educativo de los padres, las expectativas de los padres sobre el rendimiento académico de sus hijos, el estatus socioeconómico, el tamaño de la familia, tipo de familia y prácticas de control familiar sobre el trabajo escolar. Estas variables son incorporadas a dos modelos teóricos diferentes: el de Coleman y el de Bourdieu. Los resultados indican que las variables que tienen un papel destacado son: las expectativas, el nivel educativo, el estatus socioeconómico de los padres y el tamaño de la familia.

  14. Constraints on the substellar companions in wide orbits around the Barnard's Star from CanariCam mid-infrared imaging

    CERN Document Server

    Gauza, B; Rebolo, R; Álvarez, C; Bihain, G; Osorio, M R Zapatero; Caballero, J A; Telesco, C M; Packham, C

    2015-01-01

    We have performed mid-infrared imaging of Barnard's Star, one of the nearest stars to the Sun, using CanariCam on the 10.4 m Gran Telescopio Canarias. We aim to investigate an area within 1-10 arcsec separations, which for the 1.83 pc distance of the star translates to projected orbital separations of 1.8-18 AU (P > 12 yr), which have not been explored yet with astrometry or radial velocity programs. It is therefore an opportunity to enter the domain of distances where most giant planets are expected to form. We performed deep imaging in the N-band window (Si-2 filter, 8.7 {\\mu}m) reaching a 3{\\sigma} detection limit of 0.85+/-0.18 mJy and angular resolution of 0.24 arcsec, close to the diffraction limit of the telescope at this wavelength. A total of 80 min on-source integration time data were collected and combined for the deepest image. We achieved a dynamical range of 8.0+/-0.1 mag in the 8.7 {\\mu}m band, at angular separations from ~2 to 10 arcsec and of ~6-8 mag at 1-2 arcsec. No additional sources were...

  15. Canary Island Date Palm - Orange Co. [ds349

    Data.gov (United States)

    California Department of Resources — This dataset provides the known distribution of Canary Island date palm (Phoenix canariensis) in southern Orange County. The surveys were conducted from May to...

  16. Holocene geomagnetic field variations from low latitude site: contribution from the Canary Islands

    Science.gov (United States)

    Kissel, Catherine; Laj, Carlo; Rodriguez-Gonzalez, Alejandro; Perez-Torrado, Francisco; Carrracedo, Juan-Carlos; Wandres, Camille

    2016-04-01

    Full geomagnetic vector information was retrieved from 37 lava flows (corresponding to 38 sites because one flow was sampled at two different localities) located in Tenerife and Gran Canaria (Canary Islands). Twenty-eight flows are dated between 1706 AD and about 13200 BC and one is historical. Eight other non-dated flows have stratigraphic links with the dated flows and at the end, our study allowed us to attribute to them archeomagnetic ages based on their paleomagnetic characteristics. Various mineralogical analyses were conducted, giving access to the nature and grain size of the magnetic minerals. Full stepwise (about 13 steps) thermal and AF demagnetizations were conducted on more than 400 samples to determine the paleomagnetic directions. The individual MAD values are on the average about 2° and the mean precision parameter at the flow scale (alpha95) is 4.2°. For paleointensities (PI), we performed the original Thellier and Thellier experiments with a success rate of about 65%, coupling it with the strict set of selection criteria PICRIT-03. The mean PIs at the flow level are based on 3 to 12 independent PI determinations except for one site in which only one reliable determination could be obtained. The obtained data are unique in this area over the 1000-14000 BC period and they are complementary to the dataset obtained in the Canary Islands for the last 500 years. Over the last 3 kyr, they indicate some variability in the local field intensity with a prominent PI peak centered around 600 BC and reaching 80 μT (VADM 16 x 10 ^22 Am ^2), documented by four different flows and associated to significantly easterly deviated declinations. The directional data are rather consistent with the most recent models proposed for that area but the obtained PI indicate that models largely underestimate the paleointensities. Combined with published data obtained from western Africa, Spain, Portugal, Morocco and the Azores within a 2000 km-radius around the Canary

  17. Regímenes cuasiestacionarios de ozono superficial en las Islas Canarias

    OpenAIRE

    Cruz Leiva, Javier de la

    1995-01-01

    El trabajo desarrollado en esta tesis doctoral analiza las concentraciones y variaciones típicas de las concentraciones de ozona troposférico en las islas canarias. A partir del establecimiento de una nueva estación de registro de ozono en la isla de gran canaria. Los estudios realizados abarcan desde el estudio comparativo de los registros obtenidos con estaciones situadas en latitudes similares, al estudio de las variaciones periódicas y aperiodicas de este gas y su relación con factores ex...

  18. El deporte escolar en Gran Canaria. Estudio del comportamiento de los entrenadores

    OpenAIRE

    Álamo, Jose Miguel

    2002-01-01

    [ES] En este artículo se presenta un resumen de la investigación desarrollada por el autor en la que los objetivos generales son: el primero, conocer la realidad del Deporte Escolar en la isla de Gran Canaria, particularmente el perfil personal de los entrenadores. El segundo objetivo planteado es diseñar un modelo o propuesta de organización y funcionamiento del Deporte Escolar en la isla de Gran Canaria. En la primera parte, exponemos someramente la evolución del deporte como fenómeno socia...

  19. Oribátidos (Acari, Oribatei de Fuerteventura (islas Canarias

    Directory of Open Access Journals (Sweden)

    Pérez-Iñigo, C.

    1995-12-01

    Full Text Available The oribatid fauna from Fuerteventura (Canary Islands is studied for the first time; 86 species are recorded, from which 18 are new to the Science and two are new subspecies. Two new genera are erected: Passalobates n. gen. (Family Passalozetidae and Fuerteventuria n. gen. (Family Protoribatidae. Two species belonging to Ethiopic genera are described: Scutoverticosus insperatus n. sp. and Ethiovertex elisae n. sp. These genera contained until now the type species only.

    Se estudian por primera vez los ácaros oribátidos de Fuerteventura, y se citan 86 especies de las que 18 son nuevas para la Ciencia y dos son nuevas subespecies, y se establecen dos géneros nuevos: Passalobates n. gen. (Familia Passalozetidae y Fuerteventuria n. gen. (Familia Protoribatidae. Se describen dos especies de géneros etiópicos: Scutoverticosus insperatus n. sp. y Ethiovertex elisae n. sp., géneros que, hasta ahora, solo contaban con la especie tipo.

  20. Los bienes de interés cultural de Gáldar (Canarias y el conjunto histórico “Plaza de Santiago” (1981-2006

    Directory of Open Access Journals (Sweden)

    Juan Sebastián López García

    2013-10-01

    Full Text Available En 1981, hace veinticinco años, la zona central de Gáldar fue declarada “Conjunto Histórico Artístico” con la denominación de Plaza de Santiago. Sin embargo no era el primer bien cultural que obtenía una distinción de este tipo, ya que Gáldar había sido pionera en 1949 con el yacimiento de El Agujero y La Guancha, primero de los de carácter arqueológico declarado en Canarias, al que seguiría en 1972 la Cueva Pintada. Hasta la década de los setenta prevalecieron los bienes arqueológicos, situación que se modificó en las dos últimas décadas del siglo XX después del reconocimiento de la Plaza de Santiago y su entorno. Junto con edificaciones religiosas también se incluyeron ejemplos de arquitectura doméstica, completándose con algunos yacimientos prehispánicos. Una particular circunstancia fue la declaración en 1993 del pago de Barranco Hondo de Abajo, lo que convertía a Gáldar en el primer municipio de Canarias que contaba con dos conjuntos históricos, siendo éste a la vez el primero de la comunidad autonóma con características rurales. De la relación de los declarados, si exceptuamos la mayoría de los de carácter arqueológico, buena parte son urbanos. Una característica es que se incluyen categorías variadas, incluyendo la existencia de una zona arqueológica junto a un conjunto histórico y varios monumentos (de arquitectura religiosa y doméstica. Este hecho es lógico si se tiene en cuenta la particularidad de Gáldar y su condición de núcleo histórico de superposición.Twenty five years ago, in 1981, the central zone of Galdar was declared an "Historic Artistic Site" with the name of Plaza de Santiago. But this was not the first cultural asset to obtain a distinction of this kind, as Galdar pioneered protection of this kind with the El Agujero and La Guancha site, the first archaeological site declared in the Canary Islands, followed by La Cueva Pintada, in 1972. Archaeological assets prevailed up

  1. GRANADA, CANARIAS, AMÉRICA: EL USO DE PRÁCTICAS ATERRORIZANTES EN LA PRAXIS DE TRES CONQUISTAS, 1482-1557

    Directory of Open Access Journals (Sweden)

    ANTONIO ESPINO LÓPEZ

    2012-12-01

    Full Text Available Nuestro propósito en este artículo es señalar algunos rasgos afines en los procesos de conquista de Granada, Canarias y América, remarcando cómo el comportamiento militar de los hispanos se basó notablemente en el uso de toda una nómina de prácticas aterrorizantes herederas de los modelos coercitivos propios del imperialismo romano. Por otro lado, esta reflexión sobre la problemática debe conducirnos a otras nuevas, señalando, más que las limitaciones de las crónicas a la hora de abordar tales cuestiones, cómo afrontan estas la narración de la violencia y remarcando una vez más la necesidad de huir de la cosmética de la conquista hispana de las Indias.The aim of this article is to call attention to the related characteristics in the conquest process of Granada, the Canaries and America, highlighting Spanish military behavior, which was mainly based on a wide range of terrifying practices taken from coercive models of the Roman Empire. This analysis of the problem should lead us to new problems, which show us how to deal with the accounts of violence, instead of focusing on the limitations of the chronicles themselves. This in turn also emphasizes the need to escape from the cosmetic image of the Spanish conquest of the Indies.

  2. Acute Megabacteriosis and Staphylococosis of Canary in Iran

    Directory of Open Access Journals (Sweden)

    Daryoush Babazadeh

    2015-03-01

    Full Text Available Megabacteriosis and staphylococosis are two important Infectious Diseases in Canary. Macrorhabdosis is a chronic progressively debilitating, gastrointestinal disease. Staphylococcus infections are common in poultry. Clinical signs are highly variable and dependent on site-organisms. Present case report describes the Megabacteriosis and staphylococosis in canary. A dead canary was referred to the clinic of veterinary medicine, university of Tehran, Iran That was lethargic and had watery white droppings for 4 days. The proventriculus was dilated and erosive lesions were seen. In wet smear prepared from proventriculus, Macrorhabdus ornithogaster was observed by light microscope. A purulent mass was detected in metatarsal joint, the gram staining of suspected mass determined the bird suffered from staphylococosis. Prescribed drugs for Megabacteriosis and Staphylococosis were nystatin and enrofloxacin respectively.

  3. Upgraded fuel from reed canary grass

    Energy Technology Data Exchange (ETDEWEB)

    Heiskanen, V.P.

    1995-12-31

    The feasibility of RCG for commercial utilization depends primarily on its applicability for pulp production and its use in energy production will be based on the residue that will be available after extracting the pulp fraction of the RCG. Roughly 20 ..30% of the material will be available for energy production purposes. However, the percentage may be higher/lower depending on the quality standards of the pulp fiber material. The harvesting period has a significant effect on the fuel characteristics of RCG. For instance the contents of N, S, Cl, K are clearly lower if the RCG is harvested in the spring (delayed) instead of summer/autumn. These elements affect significantly overall emission formation and ash behaviour and its melting temperature. The combustion related research in this project has been focused on the spring-harvested RCG. The project aims to evaluate the feasibility of delayed harvested RCG for energy production. In order to reach this goal, the following combustion methods will be tested and studied: combustion of pelletized RCG; gasification; combustion of pulverized RCG. In addition, pelletizing, reactivity and NO conversion of pulverized RCG will be studied. The research described here is a part of `Reed Canary Grass` project (in AIR programme). The contractors of the project are Swedish University of Agricultural Sciences (coordinator), United Milling Systems from Denmark, Jaakko Poeyry Oy and VTT Energy. In addition, there are partners from several countries participating in the project. The project has been divided in five tasks, VTT Energy being responsible for combustion related task `Upgraded fuel` that includes the research topics discussed in this paper

  4. Bird pollination of Canary Island endemic plants

    Science.gov (United States)

    Ollerton, Jeff; Cranmer, Louise; Stelzer, Ralph J.; Sullivan, Steve; Chittka, Lars

    2009-02-01

    The Canary Islands are home to a guild of endemic, threatened bird-pollinated plants. Previous work has suggested that these plants evolved floral traits as adaptations to pollination by flower specialist sunbirds, but subsequently, they appear to have co-opted generalist passerine birds as sub-optimal pollinators. To test this idea, we carried out a quantitative study of the pollination biology of three of the bird-pollinated plants, Canarina canariensis (Campanulaceae), Isoplexis canariensis (Veronicaceae) and Lotus berthelotii (Fabaceae), on the island of Tenerife. Using colour vision models, we predicted the detectability of flowers to bird and bee pollinators. We measured pollinator visitation rates, nectar standing crops as well as seed-set and pollen removal and deposition. These data showed that the plants are effectively pollinated by non-flower specialist passerine birds that only occasionally visit flowers. The large nectar standing crops and extended flower longevities (>10 days) of Canarina and Isoplexis suggests that they have evolved a bird pollination system that effectively exploits these low frequency non-specialist pollen vectors and is in no way sub-optimal. Seed set in two of the three species was high and was significantly reduced or zero in flowers where pollinator access was restricted. In L. berthelotii, however, no fruit set was observed, probably because the plants were self-incompatible horticultural clones of a single genet. We also show that, while all three species are easily detectable for birds, the orange Canarina and the red Lotus (but less so the yellow-orange Isoplexis) should be difficult to detect for insect pollinators without specialised red receptors, such as bumblebees. Contrary to expectations if we accept that the flowers are primarily adapted to sunbird pollination, the chiffchaff ( Phylloscopus canariensis) was an effective pollinator of these species.

  5. La erupción submarina de La Restinga en la isla de El Hierro, Canarias: Octubre 2011-Marzo 2012

    Directory of Open Access Journals (Sweden)

    Perez-Torrado, F. J.

    2012-06-01

    Full Text Available The first signs of renewed volcanic activity at El Hierro began in July 2011 with the occurrence of abundant, low-magnitude earthquakes. The increasing seismicity culminated on October 10, 2011, with the onset of a submarine eruption about 2 km offshore from La Restinga, the southernmost village on El Hierro. The analysis of seismic and deformation records prior to, and throughout, the eruption allowed the reconstruction of its main phases: 1 ascent of magma and migration of hypocentres from beneath the northern coast (El Golfo towards the south rift zone, close to La Restinga, probably marking the hydraulic fracturing and the opening of the eruptive conduit; and 2 onset and development of a volcanic eruption indicated by sustained and prolonged harmonic tremor whose intensity varied with time. The features monitored during the eruption include location, depth and morphological evolution of the eruptive source and emission of floating volcanic bombs. These bombs initially showed white, vesiculated cores (originated by partial melting of underlying pre-volcanic sediments upon which the island of El Hierro was constructed and black basanite rims, and later exclusively hollow basanitic lava balloons. The eruptive products have been matched with a fissural submarine eruption without ever having attained surtseyan explosiveness. The eruption has been active for about five months and ended in March 2012, thus becoming the second longest reported historical eruption in the Canary Islands after the Timanfaya eruption in Lanzarote (1730-1736. This eruption provided the first opportunity in 40 years to manage a volcanic crisis in the Canary Islands and to assess the interpretations and decisions taken, thereby gaining experience for improved management of future volcanic activity. Seismicity and deformation during the eruption were recorded and analysed by the Instituto Geográfico Nacional (IGN. Unfortunately, a lack of systematic sampling of erupted

  6. Scrophularia arguta, a widespread annual plant in the Canary Islands: a single recent colonization event or a more complex phylogeographic pattern?

    Science.gov (United States)

    Valtueña, Francisco Javier; López, Josefa; Álvarez, Juan; Rodríguez-Riaño, Tomás; Ortega-Olivencia, Ana

    2016-07-01

    Many studies have addressed evolution and phylogeography of plant taxa in oceanic islands, but have primarily focused on endemics because of the assumption that in widespread taxa the absence of morphological differentiation between island and mainland populations is due to recent colonization. In this paper, we studied the phylogeography of Scrophularia arguta, a widespread annual species, in an attempt to determine the number and spatiotemporal origins of dispersal events to Canary Islands. Four different regions, ITS and ETS from nDNA and psbA-trnH and psbJ-petA from cpDNA, were used to date divergence events within S. arguta lineages and determine the phylogenetic relationships among populations. A haplotype network was obtained to elucidate the phylogenetic relationships among haplotypes. Our results support an ancient origin of S. arguta (Miocene) with expansion and genetic differentiation in the Pliocene coinciding with the aridification of northern Africa and the formation of the Mediterranean climate. Indeed, results indicate for Canary Islands three different events of colonization, including two ancient events that probably happened in the Pliocene and have originated the genetically most divergent populations into this species and, interestingly, a recent third event of colonization of Gran Canaria from mainland instead from the closest islands (Tenerife or Fuerteventura). In spite of the great genetic divergence among populations, it has not implied any morphological variation. Our work highlights the importance of nonendemic species to the genetic richness and conservation of island flora and the significance of the island populations of widespread taxa in the global biodiversity. PMID:27386073

  7. Gamma emitting radionuclides in fruits and vegetables produced in the Canary Islands: domestic consequences; Radionuclidos emisores gamma en frutas y hortalizas producidas en Canarias: consecuencias dosimetricas

    Energy Technology Data Exchange (ETDEWEB)

    Triguero-Perez, M.; Duarte-Rodriguez, X.; Lopez-Perez, M.; Hernandez-Armas, J.

    2011-07-01

    Determine the possible effects due to ingestion of radionuclides that can be found in health food is of interest from the viewpoint of radiation protection of the population. these determinations and analysis of the consequences on the health of people and jobs has led to studies that have had consequences in the form of rules to follow and values have to be attended to limit dictated by national and international agencies. (Author)

  8. Radioactive content in groundwater in the island of Tenerife (Canary Islands); Contenido radioactivo en aguas en aguas subterraneas de la Isla de Tenerifie (Canarias)

    Energy Technology Data Exchange (ETDEWEB)

    Lopez-Perez, M.; Duarte-Rodriguez, X.; Rodriguez-Perestelo, N.; Catalan-Acosta, A.; Fernandez- De Aldecoa, J. C.; Hernandez Armas, J.

    2013-07-01

    At present the groundwater in Tenerife is still the main resource to meet the demands of all kinds. Currently, due to the salt content, groundwater is treated using reversible electrodialysis desalination systems before drinking it. (Author)

  9. Network of marine environmental observation, surveillance and control in the canary islands waters (red acomar)

    Science.gov (United States)

    Rueda, M. J.; Villagarcía, M. G.; Barrera, C.; Pérez, J.; Cianca, A.; Godoy, J.; Maroto, L.; Cardona, L.; Llinás, O.

    2003-04-01

    On January 2003 it has began the experimental core deployment of a Marine Obsevational network in Gran Canaria Island sorrounding waters, as a first step of a network which will spread to the whole Canarian Archipelago. The network initially consists of 6 buoys, 3 to 5 are expected to be permanently operative whereas the rest will be under maintenance and improvement. In the beginning each buoy has a double mission: on one hand to contribute to the general observation of oceanographic/ meteorologic parameters of general interest; on the other, to provide specific interesting data to a specific user at least. Some users are the aquaculture enterprises that develop their productive activity in cages moored at sea, the water management companies, public institutions in charge of management of environmentally protected areas and organisers of sailing competitions. Each buoy is composed of a common sensors assembly (position: GPS, compass; meteorology: speed and direction of wind, air temperature, relative humidity; oceanography: water temperature, conductivity, pH, oxygen) and a specific sensor set-up (turbidity, chlorophyll, nutrients, hydrocarbons) depending on the each buoy function. Power, control and processing elements are also included in the buoy. The basic observational program consists of a reading cycle of all the parameters each hour, though it is also possible the programming of specific cycles or the request of a needed demand. Data are transmitted via VHF to a proximal point in land which is linked to a specific user, who acts as a local control element. From each point, the data are sent via a mobile or fixed telephone line to the central control, located at the ICCM. Upon arrival, the data undergo several quality and transformation processes in order to be able to publish those parameters of general interest in the project web (http://iccm.rcanaria.es), and those specific for each user according to their particular protocol. Additionally, it is

  10. Notes on the Thysanura (Insecta, Apterygota) of the Canary Islands

    NARCIS (Netherlands)

    Wygodzinsky, P.

    1952-01-01

    The present paper constitutes a report on the Machilidae and Lepismatidae collected by Dr. C. O. van Regteren Altena in the Canary Islands in the spring of 1947. We are much obliged to Dr. van Regteren Altena for allowing us to study these interesting specimens. The first notice on Thysanura from th

  11. Canariomyces notabilis, a peculiar Ascomycete from the Canary Islands

    NARCIS (Netherlands)

    Arx, von J.A.

    1984-01-01

    The Canary Islands are famous not only for the climate, but also for the flora. Many endemic plants are found, mainly succulents or woody shrubs belonging to the Euphorbiaceae, Fabaceae, Crassulaceae, Boraginaceae and Asteraceae. Monocotyledons are inconspicuous, except for Phoenix canariensis and t

  12. Further observations on Eupelminae (Hymenoptera, Chalcidoidea, Eupelmidae in the Iberian Peninsula and Canary Islands, including descriptions of new species

    Directory of Open Access Journals (Sweden)

    Askew, R. R.

    2004-06-01

    Full Text Available Data on Eupelmus Dalman, additional to that presented in Askew & Nieves-Aldrey (2000, are given here, including the location of type material of three species described by C. Bolívar. Eupelmus hungaricus Erdös is transferred to Reikosiella (n. comb.. Representation of other genera of Eupelminae in the Iberian Peninsula and Canary Islands is reviewed (Anastatus 9 spp., Arachnophaga 2 spp., Brasema 1 sp., Calymmochilus 3 spp., Merostenus 1 sp. and keys to species are given. Three species are described as new, Anastatus maculosus Askew, A. magnoculus Askew and Calymmochilus delphinus Askew.

    Se aportan datos del género Eupelmus Dalman adicionales a los presentados por Askew y Nieves-Aldrey (2000, incluyendo la localización de material tipo de tres especies descritas por C. Bolívar. Se efectúa la transferencia de Eupelmus hungaricus Erdös al género Reikosiella (n. comb.. Se revisa la representación de otros géneros de Eupelminae en la Península Ibérica e Islas Canarias: Anastatus 9 spp., Arachnophaga 2 spp., Brasema 1 sp., Calymmochilus 3 spp., Merostenus 1 sp., y se dan claves para la identificación de las especies. Se describen tres especies nuevas para la ciencia, Anastatus maculosus Askew, A. magnocolus Askew y Calymmochilus delphinus Askew.

  13. Estudio sobre las interconexiones de los sistemas eléctricos de las Islas Canarias

    OpenAIRE

    Rodríguez Bordón, Jacob David

    2011-01-01

    [ES]La interconexión de los sistemas eléctricos de las Islas Canarias, así como la de éstas con el sistema eléctrico continental africano, y por ende con el europeo, supone la mejora de los sistemas eléctricos de las Islas Canarias en múltiples aspectos, de los cuales cabe destacar aquí tres: disminución de los costes de generación, mejora de la calidad del suministro, y mejora en la penetración de la generación mediante energías renovables. En definitiva, satisfacer la demanda con una mayor ...

  14. Propuesta de cobertura periodística sobre la inmigración ilegal en Canarias

    Directory of Open Access Journals (Sweden)

    Lic. Heloísa Dallanhol

    2000-01-01

    Full Text Available La autora analiza una serie de trabajos periodísticos sobre la inmigración clandestina en Canarias y concluye que se trata de periodismo de declaraciones, nada que ver con periodismo de investigación. A continuación señala una serie de pautas y pone como ejemplo las posibilidades que se encuentran en Internet para documentar noticias como la elegida para este trabajo.

  15. The genus Eupelmus Dalman, 1820 (Hymenoptera, Chalcidoidea, Eupelmidae in peninsular Spain and the Canary Islands, with taxonomic notes and descriptions of new species

    Directory of Open Access Journals (Sweden)

    Askew, R. R.

    2000-12-01

    Full Text Available The occurrence of twenty-six species of Eupelmus Dalman in peninsular Spain and the Canary Islands is reported. Eleven species are newly recorded for Spain. Taxonomic, distributional and biological data are given. Two new species and one new subspecies are described. Eupelmus matranus Erdös is removed from synonymy under E. splendens Giraud and accorded specific rank; E. valentinus Bolívar is newly synonymized under E. testaceiventris (Motschulsky and E. capillaris Bolívar under E. fuscipennis Förster. A key to females is provided.Se citan 26 especies de Eupelmus Dalman de España peninsular e Islas Canarias, 11 de las cuales se citan por primera vez en España. Se describen dos especies y una subespecie nuevas para la ciencia y se aportan nuevos datos taxonómicos, de biología y de distribución de todas las especies listadas. Eupelmus matranus Erdös se rehabilita de sinonimia con E. splendens Giraud, otorgándole rango específico válido. Eupelmus valentinus se sinonimiza de nuevo con E. testaceiventris (Motschulsky y E. capillaris Bolívar con E. fuscipennis Förster. Se incluye una clave de identificación de las especies basada en las hembras.

  16. A deep look at the nuclear region of UGC 5101 through high angular resolution mid-IR data with GTC/CanariCam

    CERN Document Server

    Martínez-Paredes, M; Aretxaga, I; Almeida, C Ramos; Hernán-Caballero, A; González-Martín, O; Pereira-Santaella, M; Packham, C; Ramos, A Asensio; Díaz-Santos, T; Elitzur, M; Esquej, P; García-Bernete, I; Imanishi, M; Levenson, N A; Espinosa, J M Rodríguez

    2015-01-01

    We present an analysis of the nuclear infrared (IR, 1.6 to 18 $\\mu$m) emission of the ultraluminous IR galaxy UGC 5101 to derive the properties of its active galactic nucleus (AGN) and its obscuring material. We use new mid-IR high angular resolution ($0.3-0.5$ arcsec) imaging using the Si-2 filter ($\\lambda_{C}=8.7\\, \\mu$m) and $7.5-13$ $\\mu$m spectroscopy taken with CanariCam (CC) on the 10.4m Gran Telescopio CANARIAS. We also use archival HST/NICMOS and Subaru/COMICS imaging and Spitzer/IRS spectroscopy. We estimate the near- and mid-IR unresolved nuclear emission by modelling the imaging data with GALFIT. We decompose the Spitzer/IRS and CC spectra using a power-law component, which represents the emission due to dust heated by the AGN, and a starburst component, both affected by foreground extinction. We model the resulting unresolved near- and mid-IR, and the starburst subtracted CC spectrum with the CLUMPY torus models of Nenkova et al. The derived geometrical properties of the torus, including the lar...

  17. Geophysical imaging of the lacustrine sediments deposited in the La Calderilla Volcanic Caldera (Gran Canaria Island, Spain) for paleoclimate research

    Science.gov (United States)

    Himi, Mahjoub; Rodríguez-González, Alejandro; Criado, Constantino; Tapias, Josefina C.; Ravazzi, Cesare; Pérez-Torrado, Francisco; Casas, Albert

    2016-04-01

    The discovery of well-preserved maar structures is important not only for studying the eruptive activity and formation of volcanoes, but also for paleoclimate research, since laminated maar lake sediments may contain very detailed archives of climate and environmental history. Maars are a singular type of volcanic structure generated by explosive phreatomagmatic eruptions as a result of interaction between rising magma and groundwater. This kind of structures are characterised by circular craters, often filled with water and/or lacustrine sediments and surrounded by a ring of pyroclastic deposits.Recently a borehole was drilled at the bottom of La Calderilla volcanic complex which penetrated about 8.7 m in its sedimentary sequence and paleobotanical study has supplied the first evidence of paleoenvironmental evolution during the Holocene on the Gran Canaria Island. This survey, however, did not penetrate into the substrate because the total thickness of the sedimentary fill was unknown. Since the age of formation of La Calderilla volcanic complex based on K/Ar dating is about 85,000 years (Upper Pleistocene), the possibility of its sedimentary fill extends beyond of the Holocene is extremely attractive, since, for example, there are few paleoenvironmental data regarding how much the last glaciation that affected the Canary Islands. In these circumstances, the knowledge of the total thickness of the lacustrine sediments is crucial to design a deeper borehole in the next future. Therefore, the subsurface characterisation provided by geophysics is essential for determining thickness and geometry of the sedimentary filling. Multielectrode ERT method was used to obtain five 2-D resistivity cross-sections into La Calderilla volcanic caldera. An Iris Syscal Pro resistivity system with 48 electrodes connected to a 94 m long cable (2m electrode spacing) in Wenner-Schlumberger configuration for an investigation depth of about 20 m. Data quality (q noise ratio. All inverted

  18. Determinants of turism demand in the Canary Islands

    Directory of Open Access Journals (Sweden)

    Santiago Rodríguez Feijoó

    2003-01-01

    Full Text Available In this study a function of the demand for holiday making tourism inthe Canary Islands is estimated. The object is to identify the determinants of thisfunction and quantify their impact, not only on the volume of demand (length ofstay, but also on the gross income generated by tourism, given that businesses in thetourist sector as well as public institutions responsible for planning and control oftourism both measure economic results by income rather by demand.

  19. Determinants of turism demand in the Canary Islands

    OpenAIRE

    Santiago Rodríguez Feijoó; Delia Dávila Quintana; Alejandro Rodríguez Caro; Margarita Tejera Gil

    2003-01-01

    In this study a function of the demand for holiday making tourism in the Canary Islands is estimated. The object is to identify the determinants of this function and quantify their impact, not only on the volume of demand (length of stay), but also on the gross income generated by tourism, given that businesses in the tourist sector as well as public institutions responsible for planning and control of tourism both measure economic results by income rather by demand.

  20. An offshore wind atlas for the Canary Islands

    Energy Technology Data Exchange (ETDEWEB)

    Martin Mederos, A.C. [Zona Eolica Canaria S.A., Veintinueve de Abril, 30, Las Palmas 35007 (Spain); Medina Padron, J.F. [Departamento de Ingenieria Electrica, Universidad de Las Palmas de Gran Canaria, 35017 Las Palmas (Spain); Feijoo Lorenzo, A.E. [Departamento de Enxeneria Electrica, Universidade de Vigo, ETSEI, Campus de Lagoas-Marcosende, 36310 Vigo (Spain)

    2011-01-15

    In this paper an analysis of the offshore wind potential in the Canary Islands is presented in the shape of a set of wind maps which constitute an offshore wind atlas. It has been drawn up using data processed from 40 weather stations and satellite. Results from satellite mapping, limited area modelling and mesoscalar modelling have been used by applying the technique known as 'one way nesting'. (author)

  1. Migratory waterbirds at artificial ponds in NW Tenerife (Canary Islands)

    OpenAIRE

    Rodríguez, Beneharo; Rodríguez, Airam

    2011-01-01

    Human settlements have mainly destroyed natural habitat but also led to the creation of new ones, some of them suitable for wildlife. In this line, the construction of artificial ponds for irrigation of agricultural land or on golf courses may also provide new habitats for waterbirds. Large freshwater wetlands are absent or very scarce on the Canary Islands, so both migratory and resident waterbirds usually use artificial water bodies as feeding or nesting sites. We compared monthly censuses ...

  2. Wine tourism in the Canary Islands: An exploratory study

    OpenAIRE

    Duarte Alonso, Abel; Sheridan, Lynnaire; Scherrer, Pascal

    2008-01-01

    Wine tourism is experiencing significant development in both new and old European wine regions. In the case of the Canary Islands, wine has been produced and traded for centuries but little is known about the current state or potential for wine tourism on the islands, despite the fact that millions of tourists, including many potential wine tourists, visit the islands each year. In this exploratory study, the perspectives of winery owners and managers on wine tourism are examined via in-dep...

  3. Forecasting the air pollution episode potential in the Canary Islands

    OpenAIRE

    Milford, C; Marrero, C.; C. Martin; Bustos, J. J.; Querol, X.

    2008-01-01

    International audience In the frame of the WMO Global Atmosphere Watch Urban Research Meteorology and Environment programme (GURME), a system for forecasting air pollution episode potential in the Canary Islands has been developed. Meteorological parameters relevant to air quality (synoptic wind speed, wind direction, boundary layer height and temperature at 91 vertical levels) are obtained from the European Centre for Medium range Weather Forecasting (ECMWF) once a day for up to four days...

  4. Sub-regional ecosystem variability in the Canary Current upwrelling

    OpenAIRE

    Aristegui, J.; Barton, E D; Alvarez-Salgado, X. A.; Santos, A.M.P.; Figueiras, F. G.; Kifani, S.; Hernandez-Leon, S.; Mason, E.; Machu, Eric; Demarcq, Hervé

    2009-01-01

    The Canary Current upwelling ecosystem (CanC) constitutes one of the four main eastern boundary upwelling ecosystems (EBUEs) of the world, thus hosting high productivity and fisheries. Recent observations indicate that the CanC region as a whole has been experiencing a progressive warming and a decrease in productivity over the last decades. This overall trend is however not directly reflected in the fisheries of the region. Here we update recent results and previous reviews on the CanC, cove...

  5. Seasonal variability of the upper warmwatersphere in the Canary Basin

    OpenAIRE

    Pelegrí, Josep Lluís; Marrero-Díaz, Ángeles; Hernández Guerra, Alonso; Martínez, Antonio

    2001-01-01

    Two years of periodic XBT data, along seven transects covering the Canary Basin, were examined to analyse the seasonal cycle of the upper layers of the warmwatersphere. This is characterised by seasonal storage/release of heat in the surface mixed layer and by the winter formation of a subsurface positive temperature anomaly. Its maximum value takes place in early winter and deepens to about 150 m in late spring, disappearing afterwards. We present a very simple argument, which illustrates ho...

  6. An Overview of Geodetic Volcano Research in the Canary Islands

    Science.gov (United States)

    Fernández, José; González, Pablo J.; Camacho, Antonio G.; Prieto, Juan F.; Brú, Guadalupe

    2015-11-01

    The Canary Islands are mostly characterized by diffuse and scattered volcanism affecting a large area, with only one active stratovolcano, the Teide-Pico Viejo complex (Tenerife). More than 2 million people live and work in the 7,447 km2 of the archipelago, resulting in an average population density three times greater than the rest of Spain. This fact, together with the growth of exposure during the past 40 years, increases volcanic risk with respect previous eruptions, as witnessed during the recent 2011-2012 El Hierro submarine eruption. Therefore, in addition to purely scientific reasons there are economic and population-security reasons for developing and maintaining an efficient volcano monitoring system. In this scenario geodetic monitoring represents an important part of the monitoring system. We describe volcano geodetic monitoring research carried out in the Canary Islands and the results obtained. We consider for each epoch the two main existing constraints: the level of volcanic activity in the archipelago, and the limitations of the techniques available at the time. Theoretical and observational aspects are considered, as well as the implications for operational volcano surveillance. Current challenges of and future perspectives in geodetic volcano monitoring in the Canaries are also presented.

  7. Wine tourism in the Canary Islands: An exploratory study

    Directory of Open Access Journals (Sweden)

    Duarte Alonso, Abel

    2008-04-01

    Full Text Available Wine tourism is experiencing significant development in both new and old European wine regions. In the case of the Canary Islands, wine has been produced and traded for centuries but little is known about the current state or potential for wine tourism on the islands, despite the fact that millions of tourists, including many potential wine tourists, visit the islands each year. In this exploratory study, the perspectives of winery owners and managers on wine tourism are examined via in-depth face-to-face interviews among 23 small winery operators to reveal that the scope for exploiting wine tourism on the islands has been recognized and that some wineries are either already involved in wine tourism, includ-ing as part of a wine trail, or plan to be more involved in the future. It was also discovered, that there were a number of issues that challenge the development of their wine and wine tourism industry, includ-ing competition from non-Canary Island wines and anti-drink-drive laws that are inhibit passers by to consume wine at the cellar door. Operators stressed the need to find a balance between mass tourism and the niche produce of wine. Moreover, the findings identify avenues for future research on wine tourism development in the Canary Islands.

  8. Wine tourism in the Canary Islands: An exploratory study

    Directory of Open Access Journals (Sweden)

    Abel Duarte Alonso

    2008-01-01

    Full Text Available Mientras el turismo del vino está desarrollándose en varias regiones vinícolas europeas, la evolución del mismo, o su potencial, en las Islas Canarias son poco conocidos. Este estudio exploratorio examina estas áreas entre 23 bodegas insulares. Los resultados revelan el potencial de desarrollo del turismo del vino en las islas, con bodegas que, o bien ya forman parte de este concepto, o planean acrecentar su participación. Los bodegueros entrevistados reconocen impedimentos que están frenando el desarrollo de la industria vinícola y del turismo del vino en las islas, incluyendo la competición de vinos foráneos y leyes del control de alcoholemia que inhiben el consumo del vino en bodegas entre los visitantes. Asimismo, los bodegueros perciben la necesidad de encontrar un balance entre el turismo en masa y el nicho del producto vinícola. Finalmente, el estudio propone áreas de futura investigación sobre el desarrollo del turismo del vino en Canarias.

  9. Socio-economía de los recursos pesqueros de la isla de Gran Canaria

    OpenAIRE

    Nicasio-Temiño, Ángela

    2012-01-01

    Máster en Gestión Sostenible de Recursos Pesqueros [ES] Se hace una evaluación de los aspectos económicos que rodean la pesca artesanal en la isla de Gran Canaria. El pescado se vende en fresco y la comercialización de la mayor parte del mismo (especialmente especies bentodemersales) ha sido previamente convenida con los compradores habituales (pescaderías minoristas y restaurantes). Los pescadores tienen escaso poder de negociación en el precio de la captura. Los túnidos son una excepción...

  10. EVOLUCIÓN DE LA MORTALIDAD ATRIBUIBLE AL TABACO EN LAS ISLAS CANARIAS (1975-1994

    Directory of Open Access Journals (Sweden)

    Luis M Bello Luján

    2001-01-01

    Full Text Available Fundamento: El objetivo de este trabajo es describir la mortalidad atribuible al consumo de tabaco en las Islas Canarias durante el período 1975-1994. Método: Las defunciones por edad, sexo y causa desde 1975 a 1994 se obtuvieron del Instituto Nacional de Estadística (Movimiento Natural Población. A partir de las Encuestas de Salud de España y Canarias se tomaron los porcentajes de nunca fumadores, fumadores y ex-fumadores de la población canaria por edad y sexo. Los riesgos relativos de muerte se obtuvieron del Cancer Prevention Study II, llevado a cabo en Estados Unidos de América. Se calculó la proporción de muertes atribuibles al tabaco para cada año, sexo y grupo de edad a partir de la fracción atribuible poblacional. Así mismo, se calculó la tendencia de la mortalidad atribuible para dicho período expresada como el cambio porcentual medio anual de las tasas de la mortalidad ajustadas por edad, mediante un modelo log-lineal. Resultados: Durante el período 1975-1994, el número de fallecimientos atribuidos al tabaco aumentó un 64%. Por grandes causas, se observó en el período de estudio, un aumento de las neoplasias del 108%, una disminución de las enfermedades cardiovasculares del 32% y un incremento de las enfermedades respiratorias del 15,5%. Se observó también que el número de fallecidos aumenta con la edad, siendo el grupo de edad de 65 años y más en el que se presentan más muertes por el tabaco. Conclusiones: En las Islas Canarias, más del 20% de todas las muertes en 1994 se pueden atribuir al tabaco. Esto sugiere que las medidas introducidas para controlar el tabaquismo son insuficientes.

  11. The occurrence of mycoplasmas in the lungs of swine in Gran Canaria (Spain)

    DEFF Research Database (Denmark)

    Assuncao, P.; De la Fe, C.; Kokotovic, Branko;

    2005-01-01

    identified as Mycoplasma species. Using different species-specific PCRs, 40, 27, 11 and 7 of the isolates were identified as M hyorhinis, M. hyopneumoniae, M. hyosynoviae and M. flocculare, respectively. Nine of the M. hyopneumoniae cultures were found to be in mixed culture with M. flocculare...... as demonstrated by PCR. By use of a M. flocculare antiserum it was possible to eliminate M. flocculare from M. hyopneumoniae mixed cultures. This study is the first report on isolation of porcine mycoplasmas at Gran Canaria (Spain)....

  12. The Role of Gay Spaces for a Gay Destination : Gay Tourism in Gran Canaria

    OpenAIRE

    Fimiani, Roberta

    2014-01-01

    This thesis has the aim to evaluate the role of gay spaces in Gran Canaria as a gay tourists destination with particular reference to gay exclusive resorts. The validation of the gay identity is a key motivation for homosexuals to travel, in order to connect with other homosexuals and experience the gay life that they might not be able to experience at home. Gay spaces have been defined both as liberated areas as well as ghettos, where the homosexuals are, in a way, restrained. The method cho...

  13. Ácaros Mesostigmata (Acari, Mesostigmata de hábitats seleccionados de La Gomera (islas Canarias, España

    Directory of Open Access Journals (Sweden)

    Moraza, M. L.

    2005-06-01

    Full Text Available The study of 47 samples from different habitats on La Gomera (Canary Islands, reveals 43 species representing 13 families from the order Mesostigmata. Most species were members of the families Ascidae (11 species and Laelapidae (9, followed by Macrochelidae and Pachylaelapidae (7 species. The most abundant species (abundance of 9% or greater found in the collected material are: Gamasiphis pulchellus (Berlese, 1887, Gamasellodes bicolour (Berlese, 1918, Veigaia planicola Berlese, 1892 and Pseudoparasitus dentatus (Halbert, 1920. The species found in the largest number of samples were Uropoda misella (Berlese, 1916 and G. bicolour (21%, V. planicola (19% and Holoparasitus Oudemans sp. (17%. Fayal-heather and laurisilva, with 36 species, provided the most diverse habitat; 9 species are associated with Erica arborea L., 9 species with Geranium canariensis Reut. and 9 with Sideritis lotsyi (Pitard.

    Como resultado del estudio de 47 muestras recogidas en diferentes hábitats de la isla de La Gomera (Islas Canarias, se obtuvieron 43 especies pertenecientes a 13 familias del orden Mesostigmata. Las familias Ascidae y Laelapidae son las mejor representadas, con 11 y 9 especies respectivamente, seguidas de Macrochelidae y Pachylaelapidae con 7. Las especies más abundantes (abundancia mayor o igual al 9% en el material recolectado son: Gamasiphis pulchellus (Berlese, 1887, Gamasellodes bicolor (Berlese, 1918, Veigaia planicola Berlese, 1892 y Pseudoparasitus dentatus (Halbert, 1920. Las especies más frecuentes (por aparecer en el mayor número de muestras son Uropoda misella (Berlese, 1916 y G. bicolor (21%, V. planicola (19% y Holoparasitus Oudemans sp. (17%. El fayal-brezal y laurisilva (monteverde, con 36 especies, es el hábitat más diverso; 9 especies se asocian a Erica arborea L., 9 a

  14. Esas empeñadas luchas a que son muy aficionados los naturales de este país: un acercamiento a la etnicidad a través de la lucha canaria (1840-1943

    Directory of Open Access Journals (Sweden)

    Alonso, Víctor

    2016-06-01

    Full Text Available Sports in general, and traditional sports in particular, make a key contribution to the processes linked to the configuration of any identity. These activities can be studied as a reality «in its own right» (with a certain relative autonomy, as a part of a specific social subject, or as a diacritical social matter that enables us to characterize structures and social processes which, over time, could favour the changes, meanings and visions, whether considered legitimate or maligned, that are contained in these practices. This article deals with the traditional sport of lucha canaria [Canary-island wrestling], which has proved a revealing historical construct, to the extent that this popular game turned sports discipline underwent intense transformation during the 19th and early- 20th centuries. Its analysis provides an insight into the different social meanings, supports and principles associated with this activity, revealing a complex space of relations where the indigenous Guanche, historical tradition and an ongoing link with modernity are particularly relevant. All of this endorses the debate in recent decades in social anthropology and the social sciences regarding ethnicity, identity and sports.El deporte, y especialmente los deportes tradicionales, son una contribución de primer orden a los procesos de construcción identitaria. Puede ser estudiado como realidad «en sí» (dotada de relativa autonomía, al modo de un campo social específico, o bien en modo de diacrítico social que permite caracterizar unas estructuras y procesos sociales que, a lo largo del tiempo, favorecen las transformaciones, sentidos y visiones legitimadas o denostadas contenidas en las prácticas. Este artículo trata la lucha canaria, un deporte tradicional que se manifiesta como constructo histórico revelador, al tratarse de un juego popular deportivizado que vive una intensa transformación a lo largo del siglo XIX y las primeras décadas del XX. Su

  15. The Grammar School at the Cathedral of the Canary Islands (1563-1851)

    Science.gov (United States)

    Vera-Cazorla, Maria Jesus

    2013-01-01

    From 1563 until the death of the last teacher in 1851, there was a prebendary in the Cathedral of the Canary Islands in charge of the education of children. In fact, it could be said that this prebendary was the only continuous secondary school teacher there was in the Canary Islands until the beginning of the nineteenth century when the High…

  16. 78 FR 47635 - Endangered and Threatened Species; Designation of Critical Habitat for Yelloweye Rockfish, Canary...

    Science.gov (United States)

    2013-08-06

    ... under the Endangered Species Act (ESA), and bocaccio as endangered (75 FR 22276). We are responsible for... yelloweye rockfish, canary rockfish, and bocaccio (74 FR 18516, April 23, 2009), we requested information on... Sound/Georgia Basin DPS for yelloweye rockfish, canary rockfish, and bocaccio (Drake et al. 2010; 75...

  17. El discurso de rechazo al turismo en Canarias: una aproximación cualitativa

    Directory of Open Access Journals (Sweden)

    Marrero Rodríguez, J. Rosa

    2006-01-01

    Full Text Available Tourism is a very important activity in the Canary Islands, both economically and socially. It benefits local population through economic growth and employment creation. But after several decades of tourism development in the islands, academic knowledge about the behaviour of the sector and the impacts it creates is still scarce, considering its importance. One of the less known issues about tourism in the Canary Islands is the resident’s perception towards tourism. And it is this issue this paper deals with. It will be focused on the social discourses rejecting tourism in the Islands, even though it will also consider social discourses that have supported and still support tourism development. The paper adopts a qualitative strategy. The objective is not to analyze how many people in the Canary Islands reject or accept tourism, but rather to understand the meaning of their discourses about it. There are three impor-tant ideas in the reject discourse: tourism generate high concentration of population in the islands, the benefits of the activity go out and the tourists and the touristic model symbolize a low prestige consump-tion leisure product. Because today the sun and sea model symbolize low prestige

  18. Xenophobic discourse and agenda-setting. A case study in the press of the Canary Islands (Spain

    Directory of Open Access Journals (Sweden)

    Rodrigo F. Rodríguez Borges, Ph. D.

    2010-01-01

    Full Text Available Since its formulation by McCombs and Shaw in the 70s, the concept of agenda-setting has proved to be of relevant heuristic value to explore the relationship between the media agenda and the public agenda and the processes of transference between them both. Taking this idea as a reference and basing on the tools of the analysis discourse by Van Dijk, this article shows the strategy of informative dosage developed by the newspaper El Día from Tenerife, Canary Islands (Spain to turn the irregular immigration into the main issue in the civil agenda. The case study is focused on the support given by the newspaper to the call for a demonstration supporting a law of residence as the solution to the arrival of immigrants to the islands. We identified the writing units addressed to the demonstration call, the deliberate chronological sequence used to inform the readers and the editorial declarations supporting the initiative. The analysis lets us appreciate a paradigmatic example of the power of the media to set the political agenda and take in the political parties and the main institutions.Resumen: Desde su formulación en la década de los 70 por McCombs y Shaw, el concepto de 'fijación de agenda' ha demostrado un relevante valor heurístico para explorar las relaciones entre la agenda de los medios y la agenda pública y los procesos de transferencia entre ambas esferas. Tomando como referencia esta noción y apoyándose en las herramientas del análisis del discurso desarrolladas por Van Dijk, este artículo muestra la estrategia de dosificación informativa seguida por el periódico El Día, de Tenerife, Islas Canarias (España para convertir la inmigración irregular en una cuestión central en la agenda ciudadana. El estudio de caso se centra en el apoyo prestado por el diario a la convocatoria de una manifestación ciudadana en favor de una ley de residencia como solución a la llegada de inmigrantes a Canarias. En el estudio se procedió a

  19. Hatching behavior of potato cyst nematodes from the Canary Islands

    OpenAIRE

    González-Pérez, José Antonio; Phillips, M. S.

    1996-01-01

    The present work investigated early hatching differences in naturally occuring field populations and newly reared populations of potato cyst nematodes from the Canary Islands. Hatching behavior of the two species appears to be distinct, with more juveniles hatched from G. pallida that hatch earlier and over a shorter time than G. rostochiensis. The hatching rate of 3-year-old PCN populations was more than double (mean 44.5% ñ 1) that shown by newly reared populations (mean 19.1% ñ 12.5), and ...

  20. Torrefaction of pellets from reed canary grass and softwood

    Energy Technology Data Exchange (ETDEWEB)

    Oerberg, Haakan [Swedish Univ. of Agricultural Science, Unit for Biomass Technology and Chemistry, Umeaa (Sweden); Pommer, Linda; Nordwaeger, Martin; Olofsson, Ingemar [Umeaa Univ., Dept. of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry, Umeaa (Sweden)

    2012-11-01

    In this work an energy crop, Reed Canary Grass (RCG) has been studied in comparison with Norway Spruce (NS ) when treated in a torrefaction process. In the torrefaction process biomass is heated in an inert atmosphere (250-340 deg C) and physical and chemical characteristics are then enhanced and the product becomes more similar to coal. Co-firing of torrefied biomass with coal in existing CHP plants, and gasification of torrefied biomass has recently been demonstrated in industrial scale with positive results.

  1. Monitoring the NW volcanic rift-zone of Tenerife, Canary Islands, Spain: sixteen years of diffuse CO_{2} degassing surveys

    Science.gov (United States)

    Rodríguez, Fátima; Halliwell, Simon; Butters, Damaris; Padilla, Germán; Padrón, Eleazar; Hernández, Pedro A.; Pérez, Nemesio M.

    2016-04-01

    Tenerife is the largest of the Canary Islands and, together with Gran Canaria, is the only one that has developed a central volcanic complex characterized by the eruption of differentiated magmas. At present, one of the most active volcanic structures in Tenerife is the North-West Rift-Zone (NWRZ), which has hosted two historical eruptions: Arenas Negras in 1706 and Chinyero in 1909. Since the year 2000, 47 soil CO2 efflux surveys have been undertaken at the NWRZ of Tenerife Island to evaluate the temporal and spatial variations of CO2 efflux and their relationships with the volcanic-seismic activity. We report herein the last results of diffuse CO2 efflux survey at the NWRZ carried out in July 2015 to constrain the total CO2 output from the studied area. Measurements were performed in accordance with the accumulation chamber method. Spatial distribution maps were constructed following the sequential Gaussian simulation (sGs) procedure. During 2015 survey, soil CO2 efflux values ranged from non-detectable up to 103 g m-2 d-1. The total diffuse CO2 output released to atmosphere was estimated at 403 ± 17 t d-1, values higher than the background CO2 emission estimated on 143 t d-1. For all campaigns, soil CO2 efflux values ranged from non-detectable up to 141 g m-2 d-1, with the highest values measured in May 2005. Total CO2 output from the studied area ranged between 52 and 867 t d-1. Temporal variations in the total CO2 output showed a temporal correlation with the onsets of seismic activity, supporting unrest of the volcanic system, as is also suggested by anomalous seismic activity recorded in the area during April 22-29, 2004. Spatial distribution of soil CO2 efflux values also showed changes in magnitude and amplitude, with higher CO2 efflux values located along a trending WNW-ESE area. Subsurface magma movement is proposed as a cause for the observed changes in the total output of diffuse CO2 emission, as well as for the spatial distribution of soil CO2 efflux

  2. Hacia un producto integral: campaña promocional de Canarias durante los JJ.OO. de 1996

    Directory of Open Access Journals (Sweden)

    Lic. María A. Gabino Campos

    2002-01-01

    Full Text Available Los JJ.OO. de Atlanta en 1996 fueron el marco elegido por la Consejería de Turismo y Transporte del Gobierno de Canarias para introducir la marca "Canarias" en EE.UU. La ambiciosa campaña promocional se llevó a cabo desde el 18 de junio al 5 de agosto de 1996, para lo cual se instaló un pabellón promocional en el centro de la ciudad de Atlanta. Asimismo se aprovechó el viaje a Atlanta, para visitar Augusta y vender las islas como un lugar ideal para practicar golf. En esta ocasión, el Gobierno de Canarias vende el archipiélago como una única marca, "Canarias", con siete destinos. A la oferta tradicional de sol y playa se le une la historia, la cultura, la gastronomía, los deportes náuticos, la sanidad e incluso las ventajas fiscales de las islas. Por primera vez, el archipiélago se da a conocer con todas sus peculiaridades.Canarias no sólo realiza una campaña en solitario, fuera de las promociones tradicionales de ferias o impactos publicitarios, en un mercado arriesgado, sino que cambia sus ya experimentadas estrategias en el mercado europeo por una iniciativa novedosa, con el objeto de atraer nuevos inversores turísticos que sondean novedosos destinos y a empresarios en busca de lugares con regímenes fiscales especiales para instalar sus empresas.

  3. Clinical and pathological findings of concurrent poxvirus lesions and aspergillosis infection in canaries

    Institute of Scientific and Technical Information of China (English)

    Kheirandish Reza; Askari Nasrin; Salehi Mahmoud

    2013-01-01

    Objective:To investigate clinical, pathological and mycological findings in canaries, in which pox lesions and Aspergillus fumigatus (A. fumigatus) infection were observed simultaneously. Methods:This study was performed on a breeding colony (about 100 canaries) affected by fatal wasting disease. Necropsy was undertaken on 10 severely affected canaries, and gross lesions were recorded. Samples from internal organs displaying lesions were obtained for histopathological evaluation. Tracheal swap samples of internal organs of the all infected animals with lesions at necropsy were cultured in Sabouraud Dextrose Agar for mycological examination. Results: At necropsy, caseous foci were determined in the lungs, on the air sacs, liver, spleen, heart. Swelling of the eyelids, diffuse hemorrhages in the subcutaneous tissue with small papular lesions of the skin were other typical necropsy findings. Histopathologically, pathognomonic eosinophilic intracytoplasmic inclusion bodies, which called Bollinger bodies, in both skin cells and vacuolated air way epithelial cells confirmed canary pox infection. Moreover, histopathological examination of the white-yellowish caseous foci revealed necrotic granulomatous reaction consisting of macrophages, heterophil leukocytes and giant cells encapsulated with a fibrous tissue. After the culture of the tissue samples, the formation of bluish green colonies confirmed A. fumigatus infection. Conclusions:Canary pox has been known as the disease that can result in high losses in a short time, as a re-emerging disease that has not been present during recent years in canary flocks in Iran. So, the current paper provides useful information to prevent misdiagnosed of canary pox disease which can cause secondary mycotic infection.

  4. Encephalitozoon hellem infection in aviary passerine and psittacine birds in Spain.

    Science.gov (United States)

    Rosell, J; Máinez, M; Didier, E S; Bowers, L C; Marco, A; Juan-Sallés, C

    2016-03-30

    A European goldfinch (Carduelis carduelis), a canary (Serinus canaria), and a lovebird (Agapornis roseicollis) captive-bred at three different private aviaries in Spain were submitted for necropsy with a history of weakness and ruffled feathers, weight loss associated with glossitis, and respiratory disease, respectively. Microscopically, enterocytes in the jejunum and ileum contained colonies of gram- and Stamp-positive, oval to elliptical microorganisms within parasitophorous vacuoles in the apical cytoplasm. Nested PCR using MSP primers that target microsporidian RNA genes produced amplicons of expected size for Encephalitozoon species, and analysis of forward and reverse DNA sequences confirmed the presence of Encephalitozoon hellem in all cases. The main cause of death of all three birds consisted of concurrent infections. However, intestinal encephalitozoonosis may have contributed to exacerbated catabolism. Encephalitozoonosis (or microsporidiosis) has been rarely described in passerine birds. PMID:26921040

  5. Motor control of sound frequency in birdsong involves the interaction between air sac pressure and labial tension

    Science.gov (United States)

    Alonso, Rodrigo; Goller, Franz; Mindlin, Gabriel B.

    2014-03-01

    Frequency modulation is a salient acoustic feature of birdsong. Its control is usually attributed to the activity of syringeal muscles, which affect the tension of the labia responsible for sound production. We use experimental and theoretical tools to test the hypothesis that for birds producing tonal sounds such as domestic canaries (Serinus canaria), frequency modulation is determined by both the syringeal tension and the air sac pressure. For different models, we describe the structure of the isofrequency curves, which are sets of parameters leading to sounds presenting the same fundamental frequencies. We show how their shapes determine the relative roles of syringeal tension and air sac pressure in frequency modulation. Finally, we report experiments that allow us to unveil the features of the isofrequency curves.

  6. Encuesta de portadores de Neisseria meningitidis en el Área de Salud de Gran Canaria

    OpenAIRE

    García Rojas Amós; Bordes Benítez Ana; Lafarga Capuz Bernardo; Vázquez Moreno Julio; López Villarrubia Elena; García Castellano Pilar; Solís Romero José

    2000-01-01

    FUNDAMENTOS: Se plantea A) Conocer la tasa de portadores y los tipos circulantes de Neisseria Meningitidis en la población residente en el área de salud de Gran Canaria. B) Conocer el patrón de distribución de estos portadores. MÉTODOS: Se realizó un diseño descriptivo transversal, con un muestreo aleatorio en etapas múltiples y por conglomerados. Se determinó un tamaño muestral mínimo de 707 personas para una prevalencia esperada del 8,6 %, con una confianza del 95,6 % y precisión de 0,02. A...

  7. The commissioning instrument for the Gran Telescopio Canarias: made in Mexico

    Science.gov (United States)

    Cuevas, Salvador; Sánchez, Beatriz; Bringas, Vicente; Espejo, Carlos; Flores, Rubén; Chapa, Oscar; Lara, Gerardo; Chavoya, Armando; Anguiano, Gustavo; Arciniega, Sadot; Dorantes, Ariel; Gonzalez, José L.; Montoya, Juan M.; Toral, Rafael; Hernández, Hugo; Nava, Roberto; Devaney, Nicolas; Castro, Javier; Cavaller, Luis; Farah, Alejandro; Godoy, Javier; Cobos, Francisco; Tejada, Carlos; Garfias, Fernando

    2006-02-01

    In March 2004 was accepted in the site of Gran Telescopio Canarias (GTC) in La Palma Island, Spain, the Commissioning Instrument (CI) for the GTC. During the GTC integration phase, the CI will be a diagnostic tool for performance verification. The CI features four operation modes-imaging, pupil imaging, Curvature Wave-front sensing (WFS), and high resolution Shack-Hartmann WFS. This instrument was built by the Instituto de Astronomia UNAM in Mexico City and the Centro de Ingenieria y Desarrollo Industrial (CIDESI) in Queretaro, Qro under a GRANTECAN contract after an international public bid. Some optical components were built by Centro de Investigaciones en Optica (CIO) in Leon Gto and the biggest mechanical parts were manufactured by Vatech in Morelia Mich. In this paper we made a general description of the CI and we relate how this instrument, build under international standards, was entirely made in Mexico.

  8. El cólera en Canarias (1851: su tratamiento en prensa

    Directory of Open Access Journals (Sweden)

    Lic. Gabriel Díaz Mora

    1998-01-01

    Full Text Available El cólera, también llamado "cólera morbo" -ambos términos se usan en los periódicos estudiados- es una enfermedad aguda y contagiosa, que se manifiesta por superaciones acuosas, retortijones, vómitos, calambres musculares, supresión de la orina y colapso. La causa el bacilo vibrión de Koch cuando infesta el agua potable. Normalmente causa la muerte por convulsiones, colapso y congestión pulmonar.Esta enfermedad se produce principalmente en los trópicos, pero ha aparecido en todas las partes del mundo, llevada por el hombre en sus viajes. Esto ha justificado numerosas veces la cuarentena, como observamos en la epidemia canaria de 1851.

  9. Patient safety against radioelectric emissions internal and external at the Hospital Universitario de Canarias

    International Nuclear Information System (INIS)

    Electromagnetic fields (EMF) present in a health center, must be known and to be controlled so that your levels are at all times below the limits established by law in the face of patient safety, health personnel and other users. In addition, they may be the source of interference on medical equipment and, consequently, the cause of errors in diagnosis or treatments applied to the sick. This paper presents the results of the measurements made at the Hospital Universitario de Canarias (HUC) EMF levels of radio emissions from the antennas installed in our hospital (Tetra, pagers, and wi-fi) and external emissions from most relevant, either because of their widespread use (mobile phones) or the proximity to the Hospital of the antennas (commercial broadcasters).

  10. La principal colección de periódicos sobre Canarias: la hemeroteca de la Universidad de La Laguna

    Directory of Open Access Journals (Sweden)

    Dr. Javier González Antón

    1998-01-01

    Full Text Available Descripción de uno de los más importantes fondos hemerográficos del mundo sobre las Islas Canarias, las colecciones de periódicos y revistas, desde los manuscritos del siglo XVIII, los primeros impresos de 1785, hasta la serie completa de los actuales, conservados en la Hemeroteca de Canarias de la Universidad de La Laguna, con sus servicios y prestaciones.

  11. Les formations marines et continentales intervolcaniques des îles Canaries orientales (Grande Canarie. Fuerteventura et Lanzarote: Stratigraphie et signiflcation paleoclimatique.

    Directory of Open Access Journals (Sweden)

    Meco, J.

    1985-08-01

    Full Text Available More than 20 m. y. of continuous activity in the Canary Islands have brought about the fossilization of marine fauna and soils which prove the existence of alternating warm and numid conditions of guinean origen, and also of drier influences from the Sahara, connected with the arrival of cold waters from the Lusitanian Sea. The sea deposits of the lower Pleistocene with Strombus coronatus and those of the upper Pleistocene with Strombus bubonius, which are caracteristically warm and the deposits of middle and upper Pleistoeene and of the Holocene, with various species of Patella and caracteristically cold (Meco, 1977, have already been related to volcanic activities dated by K/Ar (Meco y Steams, 1981 and are new being related to rapid effects of soil formation, the result of evaporation an clayey neoformation of volcanic materials which are constantly being renoved. The fairly rapid fossilization caused by volcanic activity, eliminates some of the effects accumulated over a period of time on the paleosoils, The existence of Saharian quartz, a mineral not found in volcanic products, and the simultaneous existence of more distant matters on the evolution of soilformation, like crusts which contain gypsum or attapulgyte of desert origin and bauxites containing nickel and tale of tropical, humid origin (Pomel, 1985, all this permit to find coherents conclusions.

    Más de 20 m. a. de actividad volcánica continuada ha permitido en las Canarias la fosilización de faunas marinas y suelos que testimonian una alternancia de condiciones cálidas y húmedas, de origen guineano, y de influencias secas, saharianas, relacionadas con aportes de aguas frescas de procedencia lusitana. Los depósitos marinos del Plioceno inferior con Strombus coronatus y los del Pleistoceno superior con Strombus bubonius, que revelan un carácter cálido, y los depósitos del Pleistoceno medio y superior y del Holoceno, con varias

  12. Influence of the North Atlantic Oscillation on the Canary Islands precipitation

    OpenAIRE

    García Herrera, Ricardo; Gallego Puyol, David; Hernández Martín, Emiliano; Gimeno, Luis; Ribera Rodríguez, Pedro

    2001-01-01

    The aim of this paper is to investigate the relationship between the Canary Island rainfall and the Atlantic large-scale circulation, characterized by the North Atlantic oscillation (NAO) index. The Canary Islands are located in the Atlantic subtropical belt under the direct influence of the Azores high and the trade winds. Their steep orography makes the islands very sensitive to small variations in a synoptic situation, thus providing an excellent natural observatory for the North Atlantic ...

  13. Canarias y América. Aspectos de una vinculación histórica

    Directory of Open Access Journals (Sweden)

    Manuel De Paz

    2007-10-01

    Full Text Available Este artículo destaca aspectos importantes de las relaciones entre las islas Canarias y el continente americano, durante la Edad Moderna. En primer lugar estudia brevemente los privilegios del Archipiélago para comerciar con América, frente al monopolio de Sevilla. Las islas Canarias tuvieron este privilegio a causa de su situación geográfica, que les proveía de un gran interés estratégico y, también, por su debilidad estructural. En segundo lugar se analiza el problema de la emigracíon a América, que fue muy destacado a lo largo de la historia. Este fenómeno de ida y vuelta ha originado un rico intercambio cultural, cuyas huellas perviven en nuestros días.

  14. Emergent littoral deposits in the eastern Canary Islands

    Science.gov (United States)

    Meco, Joaquin; Stearns, Charles E.

    1981-03-01

    K-Ar ages ( A. Abdel-Monem, P. D. Watkins, and P. W. Gast, 1971, American Journal of Science271, 490-521; this paper) and revised paleontological determinations ( J. Meco, 1977, "Los Strombus neogenos y cuatenarios del Atlantico euroafricano", Las Palmas, Ediciones del Excmo. Cabildo Insular de Gran Canaria) show that "Quaternary" ( R. Crofts, 1967, Quaternaria 9, 247-260; G. Lecointre, K. J. Tinkler, and G. Richards, 1967, Academy of Natural Science of Philadelphia Proceedings119, 325-344) littoral deposits on Lanzarote and Fuerteventura are early Pliocene and late Pleistocene. Early and middle Pleistocene strand lines are not represented. Early Pliocene littoral and marine deposits contain a characteristic fossil assemblage: Strombus coronatus, Nerità emiliana, Gryphaea virleti, Patella cf. intermedia, and Rothpletzia rudista. Differences in elevation record differential post-Pliocene uplift of the coastal platforms on which they lie. Late Pleistocene beach deposits at low elevations belong to two groups, an older with Strombus bubonius and a younger without. Differences in elevation of early Pliocene littoral deposits are reflected by differences in elevation of late Pleistocene beach deposits nearby.

  15. First report of southern Tomato virus in tomato in the Canary Islands, Spain

    NARCIS (Netherlands)

    Verbeek, M.; Dullemans, A.M.; Espino, A.; Botella, M.; Alfaro-Fernández, A.; Font, M.I.

    2015-01-01

    In October 2006, tomato plants with torrado disease were sampled in Spain. In a sample of cv. Mariana, originating from Gran Canaria, Tomato torrado virus (ToTV, genus Torradovirus) was detected (isolate GCN06; Alfaro-Fernández et al., 2010). In 2013, the sample was further analysed using next-gener

  16. Inventariando la biodiversidad en el Parque Nacional de La Caldera de Taburiente (La Palma, Islas Canarias, España: novedades científicas

    Directory of Open Access Journals (Sweden)

    Domingo-Quero, Teresa

    2003-12-01

    Full Text Available This paper is the first result of an agreement between the Organismo Autónomo Parques Nacionales and the Consejo Superior de Investigaciones Científicas, entitled “Inventory and study of the Invertebrate Fauna of the National Park of La Caldera de Taburiente”. A detailed account of the faunistic novelties found up to now among the specimens of terrestrial and freshwater invertebrates collected along the two years of sampling (July 1999 to July 2001, whose number is estimated in ca. 500,000, is given. A brief description of planning and of methodology applied to the inventory of the invertebrate fauna is made and a tabulated summary of novelties is presented. The list shows at present 284 families, 594 genera and 739 species. For the Canary Islands, the present record of new taxa is 29 families, 115 genera (1 of them confirmed as new to Science and 3 awaiting confirmation and 187 species (24 new to Science. Moreover, 242 genera and 338 species are new to the fauna of La Palma I., being known from other islands of the archipelago. Other 47 taxa, still being studied, could be new to Science as well. These results have been reached with the study of just a minimal part of the whole material, which underlines the need for systematic, continued sampling to evaluate the faunistic richness of poorly explored areas and its possible necessity for protection. Therefore, one should expect more novelties and the inventory may increase significantly when all the material is revised.

    El presente artículo es el primer resultado de un convenio entre el Organismo Autónomo Parques Nacionales y el Consejo Superior de Investigaciones Científicas, denominado “Inventario y estudio de la Fauna Invertebrada del Parque Nacional de La Caldera de Taburiente”. Se detallan las novedades faunísticas encontradas hasta el momento entre los ejemplares de invertebrados terrestres y dulceacuícolas recogidos durante los dos años de muestreo (julio de 1999 a

  17. Turismo y administración local en Canarias: un problema pendiente. Bases para un debate

    Directory of Open Access Journals (Sweden)

    Juan Israel García Cruz

    2014-02-01

    Full Text Available Las administraciones locales deben gestionar una parte importante de las infraestructuras y serviciosdemandados por el turismo. En estas áreas se combina la prestación de servicios a la población turísticay población local, lo que supone su redimensionamiento y diversificación. Como resultado, los municipiosafectados por esta dualidad deben adaptar la gestión de sus recursos, produciéndose importantesdesequilibrios.Esta distinción ha abierto un importante debate en torno a la figura del «municipio turístico» y su«discriminación positiva» frente al resto de municipios. Una fórmula que trata de compensar el desequilibrioque genera la actividad turística en la gestión local. Actualmente las islas Canarias carecende criterios oficiales para la definición de un municipio turístico, así como no se ha consensuado unlistado oficial que los identifique. En este sentido, el presente artículo pretende hacer algunas aportacionesa este debate, planteando una propuesta de delimitación.

  18. Estimated UV doses to psoriasis patients during climate therapy at Gran Canaria in March 2006

    Directory of Open Access Journals (Sweden)

    L. T. N. Nilsen

    2008-01-01

    Full Text Available Psoriasis is a chronic inflammatory disease involving about 2–3% of the Norwegian population. Sun exposure has a positive effect on most psoriasis lesions, but ultraviolet (UV radiation also causes a direct DNA damage in the skin cells and comprises a carcinogenic potential. UV exposure on the skin causes a local as well as a systemic immune suppressive effect, but the relation between sun exposure and these biological effects is not well known. In March 2006 a study was carried out to investigate possible therapeutic outcome mechanisms in 20 psoriasis patients receiving climate therapy at Gran Canaria. This paper presents estimates of their individual skin UV-doses based on UV measurements and the patients' diaries with information on time spent in the sun.

    On the first day of exposure the patients received on average 5.1 Standard Erythema Doses (SED: median=4.0 SED, range 2.6–10.3 SED estimated to the skin. During the 15 days study they received 165.8 SED (range 104.3–210.1 SED. The reduction in PASI score was 72.8% on average, but there was no obvious relation between the improvement and the UV dose. The UV doses were higher than those found from climate therapy studies at other locations. It seems beneficial to use more strict exposure schedules that consider the available UV irradiance, depending on time of the day, time of the year and weather conditions.

  19. Climate therapy of psoriasis patients at Gran Canaria. High UV doses

    International Nuclear Information System (INIS)

    Psoriasis is a chronic inflammatory disease involving about 2-3% of the European population. Sun exposure has a positive effect on most psoriasis lesions, but ultraviolet (UV) radiation also causes a direct DNA damage in the skin cells and comprises a carcinogenic potential. UV exposure on the skin causes a local as well as a systemic immune suppressive effect, but the relation between sun exposure and these biological effects is not well known. In March 2006 a study was carried out to investigate possible therapeutic outcome mechanisms in 20 psoriasis patients receiving climate therapy at Gran Canaria. This paper presents estimates of their individual skin UV doses based on UV measurements and patients' diaries with information on time spent in the sun. On the first day of exposure the patients received on average 5.1 Standard Erythema Doses (SED) estimated to the skin. During the 15 days study they received 166 SED. There was no significant correlation between the therapeutic improvement and the UV dose. The UV doses were higher than if they had followed the prescribed exposure schedule and also higher than doses found from climate therapy studies at other locations. It seems beneficial to focus on the prescribed exposure schedules. (author)

  20. El abastecimiento de pescado fresco en Las Palmas de Gran Canaria a fines del siglo XVIII

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    Antonio de BETHENCOURT MASSIEU

    2009-12-01

    Full Text Available En el transcurso del setecientos, particularmente en su segunda mitad, cruza sobre España, al igual que sobre el resto de Occidente, una polémica sobre las ventajas que reportaría la libertad de precio de los productos —su valor regulado por la ley de oferta y la demanda—, motor del desarrollo económico.No es ahora mi objeto detenerme en el análisis de la penetración de las doctrinas fisiocráticas y del librecambismo smithsoniano. Mi interés se reduce a cosa mucho más simple. Mostrar como también la polémica alcanzó a Canarias. Veremos la lucha que sostuvo la Real Sociedad Económica de Amigos del País de Las Palmas en pro de la abolición de la tasa del pescado fresco que consumía la población.

  1. Eddy and deep chlorophyl maximum response to wind-shear in the lee of Gran Canaria

    Science.gov (United States)

    Basterretxea, G.; Barton, E. D.; Tett, P.; Sangrá, P.; Navarro-Perez, E.; Arístegui, J.

    2002-06-01

    The physical and biological properties of the warm wake of Gran Canaria were examined during a survey carried out in June 1998. The sampling region was dominated by the presence of a warm triangular region downwind the island and an anticyclonic eddy spun off the island. Convergent and divergent frontal regions were generated by the wind shear zones extending along either side of the sheltered region of the warm wake. With increasing distance from shore, evidence of convergent/divergent frontal regions weakened, but the influence of the eddy increased. Both structures, frontal regions and the eddy, clearly altered the vertical phytoplankton biomass distribution as indicated by chlorophyll-fluorescence. Downwelling on the convergent boundary moved the 26.2 kg m -3 isopycnal and its associated deep chlorophyll maximum (DCM) below the 1% light zone. Upwelling at the divergent boundary not only elevated the DCM with its associated isopycnal but also, because of the increased light levels, allowed a shift in the DCM to higher (deeper) density surfaces (26.4 kg m -3). However, the highest integrated chlorophyll occurred in the central wake.

  2. Observations of three young gamma-ray pulsars with the Gran Telescopio Canarias

    CERN Document Server

    Mignani, R P; Testa, V; Marelli, M; De Luca, A; Pierbattista, M; Shearer, A; Torres, D F; Wilhelmi, E De Ona

    2016-01-01

    We report the analysis of the first deep optical observations of three isolated $\\gamma$-ray pulsars detected by the {\\em Fermi Gamma-ray Space Telescope}: the radio-loud PSR\\, J0248+6021 and PSR\\, J0631+1036, and the radio-quiet PSR\\, J0633+0632. The latter has also been detected in the X rays. The pulsars are very similar in their spin-down age ($\\tau \\sim$40--60 kyrs), spin-down energy ($\\dot{E} \\sim10^{35}$ erg s$^{-1}$), and dipolar surface magnetic field ($B \\sim 3$--$5\\times10^{12}$ G). These pulsars are promising targets for multi-wavelength observations, since they have been already detected in $\\gamma$ rays and in radio or X-rays. None of them has been detected yet in the optical band. We observed the three pulsar fields in 2014 with the Spanish 10.4m Gran Telescopio Canarias (GTC). We could not find any candidate optical counterpart to the three pulsars close to their most recent radio or {\\em Chandra} positions down to $3 \\sigma$ limits of $g'\\sim27.3$, $g'\\sim27$, $g'\\sim27.3$ for PSR\\, J0248+602...

  3. La erupción y el tubo volcánico del Volcán Corona (Lanzarote, Islas Canarias

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    Láinez, A.

    2003-12-01

    Full Text Available The island of Lanzarote, located at the eastem, oldest edge of the Canarian hotspot island-chain, has very sparse Holocene rejuvenation volcanism, possibly restricted to the 1824 and 1730 eruptions, ir1 agreement with the mature post-erosional stage of the island. The dating of the Corona Volcano, possibly the most recent eruptive event in the island before the historic eruptions, gives a mean 40Ar/.i9Ar age of 21 f 6.5 ka. This age agrees with the geological observations and the study of the Corona Volcano, particularly the large lava tube (7.6 km long, up to 25 m in diameter formed in the initial stages of the eruption. The last 1.6 km of' this lava tube are at present submerged, ending at a depth of at least 80 m below the present sea level. Our interpretation is that the active lava tube could not have reached that depth and, therefore, the submerged part of the tube formed as the lava flowed on a coastal platform at least 1.6 km wider and at least 80 m below the present sea level, a circumstance that could only have been possible coinciding with a period of low sea-leve1 stand related to a maximum glacial, most probably the last one, at about 20 ka. The subsequent rise in sea level left the coastal platform and the end of the lava tube submerged. The age of the Corona Volcano eruption is constrained by the radioisotopic determinations in 21 + 6.5 ka and, concordantly, by the low sea-leve1 stand recorded between about 18 and 21 ka. The Corona Volcano eruption and lava tube therefore provide clear evidence of changes in sea level in the Canaries in relation to glaciations, and establish important constraints in the volcanic history of the island of Lanzarote.La isla de Lanzarote, situada en el extremo oriental de la alineación del punto caliente de las Canarias, ha tenido escasa actividad eruptiva de rejuvenecimiento en el Holoceno, posiblemente reducida a las erupciones de 1730 y 1824, hecho que concuerda con el avanzado estado post

  4. The Climate of the Canary Islands by Annual Cycle Parameters

    Science.gov (United States)

    Bechtel, B.

    2016-06-01

    Annual cycle parameters (ACP) provide a global climatology of annual land surface temperature (LST) based on daily 1 km MODIS observations. These are based on a simple model of the annual temperature cycle and allow estimating LST patterns under largely cloud-free conditions for every day of year. Further, they deliver measures for the LST variability and the frequency of cloud occurrence. It has been demonstrated, that they reproduce important surface climate characteristics at global and urban scale but their ability to reproduce topo-climates has yet to be studied in detail. In this paper their suitability to investigate climatic variability at km scale were studied at the case of the Canary Islands (Spain). This Archipelago, has a very stable climate dominated by the Azores high and the trade wind belt, but shows a large number of micro-climates ranging from arid hot climates to cold climates. It was found that ACPs are a relevant source of climatic information at km scale in complex orography. Specifically, known features such as subsidence inversion, the resulting sea of clouds, the strong differentiation in precipitation between the flat and high islands, as well as the northern and southern slopes at the latter were clearly visible in the parameters.

  5. Pre-Hispanic Sanctuaries in the Canary Islands

    Science.gov (United States)

    Belmonte, Juan Antonio

    Cultural astronomy studies in the Canarian archipelago now have a tradition spanning two decades. The statistical relevance of astronomical implications for a certain number of sites and the spectacular character of some of the astronomical hierophanies discovered - with low probability of having been produced by chance in most cases - clearly points to an intentionality in the astronomical relationships discovered so far. All these arguments strongly suggest that tracking the movement of the celestial bodies was an important consideration in the erection and purpose of many pre-Hispanic sanctuaries. The alignment of footprint engravings at Montaña Tindaya, and the major lunistice moonrise at Roque Nublo and the summer solstice sunset at Teide, as observed from the sacred sites of Bentaiga and Gamona, respectively, may also be catalogued as outstanding examples of the strong relationship between astronomy and landscape in ancient Canary Islands culture. The recently discovered light-and-shadow effects at Risco Caído will also be briefly discussed.

  6. Radon Exposures in the Caves of Tenerife (Canary Islands)

    International Nuclear Information System (INIS)

    There are more than a hundred volcanic caves and pits of various lengths on the island of Tenerife (Canary Islands, Spain). The results are presented of atmospheric radon measurements performed in three of these caves and in three pits. One of the caves selected, El Viento Cave, is nearly 20 km in length and is the longest volcanic tube in the Canarian archipelago and the second longest in the world. The measurements were performed over two distinct periods during the year using passive polycarbonate detectors. The mean radon concentrations range between 0.3 and 8 kBq.m-3, the maximum value corresponds to a site located at 1850 m from the mouth of El Viento Cave. Possible touristic development of these caves has been taken into account in estimating the effective doses for visitors and guides (considered separately). The values obtained range from 0.3 to 100 μSv per visit for visitors. The largest effective dose would correspond to that for guides at 41 mSv.y-1 in the Viento Cave. This result would make protection against radiological hazards obligatory if the cave were to be developed as a site for tourism. (author)

  7. Aridity, desalination plants and tourism in the eastern Canary Islands

    Directory of Open Access Journals (Sweden)

    José-León García-Rodríguez

    2016-05-01

    Full Text Available The islands of Lanzarote and Fuerteventura are the easternmost of the Canary Islands, and are located on the southern edge of the temperate zone, in the subtropical anticyclone belt. With less than 150 mm of rainfall a year, they are classified as an arid zone. Their inhabitants have devised original agricultural systems to combat the aridity, although low yields have historically limited socio-economic development and population growth. These systems were used until the introduction of seawater desalination plants and the arrival of tourism in the last third of the twentieth century, which improved living standards for the local population but also led to a cultural transition. Nevertheless, these farming systems have left behind an important regional heritage, with an environmental and scenic value that has played an integral role in the latest phase of development. The systems have become a tourist attraction and have been central to the two islands being designated biosphere reserves by UNESCO. This article aims to analyse the main socioeconomic and land-use changes that have come about as a result of desalination technology.

  8. CANARY phase B: on-sky open-loop tomographic LGS AO results

    Science.gov (United States)

    Morris, Tim; Gendron, Eric; Basden, Alastair; Martin, Olivier; Osborn, James; Henry, David; Hubert, Zoltan; Sivo, Gaetano; Gratadour, Damien; Chemla, Fanny; Sevin, Arnaud; Cohen, Matthieu; Younger, Eddy; Vidal, Fabrice; Wilson, Richard; Butterley, Tim; Bitenc, Urban; Reeves, Andrew; Bharmal, Nazim; Raynaud, Henri-François; Kulcsar, Caroline; Conan, Jean-Marc; Huet, Jean-Michel; Perret, Denis; Dickson, Colin; Atkinson, David; Bailie, Tom; Longmore, Andy; Todd, Stephen; Talbot, Gordon; Morris, Simon; Rousset, Gérard; Myers, Richard

    2014-07-01

    CANARY is an on-sky Laser Guide Star (LGS) tomographic AO demonstrator that has been in operation at the 4.2m William Herschel Telescope (WHT) in La Palma since 2010. In 2013, CANARY was upgraded from its initial configuration that used three off-axis Natural Guide Stars (NGS) through the inclusion of four off-axis Rayleigh LGS and associated wavefront sensing system. Here we present the system and analysis of the on-sky results obtained at the WHT between May and September 2014. Finally we present results from the final `Phase C' CANARY system that aims to recreate the tomographic configuration to emulate the expected tomographic AO configuration of both the AOF at the VLT and E-ELT.

  9. Encuesta de portadores de Neisseria meningitidis en el Área de Salud de Gran Canaria

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    García Rojas Amós

    2000-01-01

    Full Text Available FUNDAMENTOS: Se plantea A Conocer la tasa de portadores y los tipos circulantes de Neisseria Meningitidis en la población residente en el área de salud de Gran Canaria. B Conocer el patrón de distribución de estos portadores. MÉTODOS: Se realizó un diseño descriptivo transversal, con un muestreo aleatorio en etapas múltiples y por conglomerados. Se determinó un tamaño muestral mínimo de 707 personas para una prevalencia esperada del 8,6 %, con una confianza del 95,6 % y precisión de 0,02. Asumiendo que un 15 % de las personas no quisieran colaborar, se incrementó el tamaño muestral a 831 personas, distribuidas en cada conglomerado de manera proporcional a la población existente. Este tamaño se distribuyó a su vez, en cuatro grandes grupos de edad y sexo, proporcionalmente a su importancia en cada zona básica de salud seleccionada aleatoriamente. Los individuos de la muestra se identificaban entre los que acudían a las unidades de extracción, y una vez superados los criterios de exclusión se les solicitaba su colaboración voluntaria en el estudio. Si aceptaban, se les cumplimentaba un cuestionario que englobaba diferentes variables de interés epidemiológico y se les realizaba un frotis faríngeo. Al haber seleccionado los equipos de Atención Primaria con muestreo aleatorio simple y seguir el mismo método para elegir los individuos dentro de ellos, la estimación de la prevalencia se realizó mediante estimador no sesgado. RESULTADOS: Se obtuvieron un total de 828 muestras, lo que supuso un 99,6% de las previstas. Salvo tres, todos los individuos seleccionados participaron voluntariamente en el estudio, lo que le confiere una alta representatividad. Todas las cepas obtenidas correspondían a N. Meningitidis Serogrupo B, salvo una identificada como N. Meningitidis Serogrupo C Sero/Subtipo 4:P1.2,5. Las cepas de N. Meningitidis serogrupo B identificadas, correspondían a 25 serosubtipos diferentes. La prevalencia puntual

  10. Imaging Canary Island hotspot material beneath the lithosphere of Morocco and southern Spain

    Science.gov (United States)

    Miller, Meghan S.; O'Driscoll, Leland J.; Butcher, Amber J.; Thomas, Christine

    2015-12-01

    The westernmost Mediterranean has developed into its present day tectonic configuration as a result of complex interactions between late stage subduction of the Neo-Tethys Ocean, continental collision of Africa and Eurasia, and the Canary Island mantle plume. This study utilizes S receiver functions (SRFs) from over 360 broadband seismic stations to seismically image the lithosphere and uppermost mantle from southern Spain through Morocco and the Canary Islands. The lithospheric thickness ranges from ∼65 km beneath the Atlas Mountains and the active volcanic islands to over ∼210 km beneath the cratonic lithosphere in southern Morocco. The common conversion point (CCP) volume of the SRFs indicates that thinned lithosphere extends from beneath the Canary Islands offshore southwestern Morocco, to beneath the continental lithosphere of the Atlas Mountains, and then thickens abruptly at the West African craton. Beneath thin lithosphere between the Canary hot spot and southern Spain, including below the Atlas Mountains and the Alboran Sea, there are distinct pockets of low velocity material, as inferred from high amplitude positive, sub-lithospheric conversions in the SRFs. These regions of low seismic velocity at the base of the lithosphere extend beneath the areas of Pliocene-Quaternary magmatism, which has been linked to a Canary hotspot source via geochemical signatures. However, we find that this volume of low velocity material is discontinuous along strike and occurs only in areas of recent volcanism and where asthenospheric mantle flow is identified with shear wave splitting analyses. We propose that the low velocity structure beneath the lithosphere is material flowing sub-horizontally northeastwards beneath Morocco from the tilted Canary Island plume, and the small, localized volcanoes are the result of small-scale upwellings from this material.

  11. Gravity and multichannel seismic reflection constraints on the lithospheric structure of the Canary Swell

    Science.gov (United States)

    Ranero, C. R.; Torne, M.; Banda, E.

    1995-12-01

    Deep penetrating multichannel seismic reflection and gravity data have been used to study the lithospheric structure of the Canary Swell. The seismic reflection data show the transition from undisturbed Jurassic oceanic crust, away from the Canary Islands, to an area of ocean crust strongly modified by the Canary volcanism (ACV). Outside the ACV the seismic records image a well layered sedimentary cover, underlined by a bright reflection from the top of the igneous basement and also relatively continuous reflections from the base of the crust. In the ACV the definition of the boundary between sedimentary cover and igneous basement and the crust-mantle boundary remains very loose. Two-dimensional gravity modelling in the area outside the influence of the Canary volcanism, where the reflection data constrain the structure of the ocean crust, suggests a thinning of the lithosphere. The base of the lithosphere rises from 100 km, about 400 km west of the ACV, to 80 km at the outer limit of the ACV. In addition, depth conversion of the seismic reflection data and unloading of the sediments indicate the presence of a regional depth anomaly of an extension similar to the lithospheric thinning inferred from gravity modelling. The depth anomaly associated with the swell, after correction for sediment weight, is about 500 m. We interpret the lithospheric thinning as an indication of reheating of old Mesozoic lithosphere beneath the Canary Basin and along with the depth anomaly as indicating a thermal rejuvenation of the lithosphere. We suggest that the most likely origin for the Canary Islands is a hot spot.

  12. Observations of three young γ-ray pulsars with the Gran Telescopio Canarias

    Science.gov (United States)

    Mignani, R. P.; Rea, N.; Testa, V.; Marelli, M.; De Luca, A.; Pierbattista, M.; Shearer, A.; Torres, D. F.; De Oña Wilhelmi, E.

    2016-10-01

    We report the analysis of the first deep optical observations of three isolated γ-ray pulsars detected by the Fermi Gamma-ray Space Telescope: the radio-loud PSR J0248+6021 and PSR J0631+1036, and the radio-quiet PSR J0633+0632. The latter has also been detected in the X-rays. The pulsars are very similar in their spin-down age (τ ˜ 40-60 kyr), spin-down energy (dot{E} ˜ 10^{35} erg s-1), and dipolar surface magnetic field (B ˜ 3-5 × 1012 G). These pulsars are promising targets for multiwavelength observations, since they have been already detected in γ-rays and in radio or X-rays. None of them has been detected yet in the optical band. We observed the three pulsar fields in 2014 with the Spanish 10.4 m Gran Telescopio Canarias (GTC). We could not find any candidate optical counterpart to the three pulsars close to their most recent radio or Chandra positions down to 3σ limits of g' ˜ 27.3, g' ˜ 27, g' ˜ 27.3 for PSR J0248+6021, J0631+1036, and J0633+0632, respectively. From the inferred optical upper limits and estimated distance and interstellar extinction, we derived limits on the pulsar optical luminosity. We also searched for the X-ray counterpart to PSR J0248+6021 with Chandra but we did not detect the pulsar down to a 3σ flux limit of 5 × 10-14 erg cm-2 s-1 (0.3-10 keV). For all these pulsars, we compared the optical flux upper limits with the extrapolations in the optical domain of the γ-ray spectra and compared their multiwavelength properties with those of other γ-ray pulsars of comparable age.

  13. Valoración y determinantes del stock de capital salud en la Comunidad Canaria y Cataluña

    OpenAIRE

    Juan Oliva; Néboa Zozaya

    2007-01-01

    En los últimos años estamos asistiendo a cambios en la definición del concepto de salud aplicable a individuos y poblaciones. En el presente trabajo se propone la estimación del stock de capital salud de la población residente en la Comunidad Canaria. Para ello, en primer lugar, se estiman la Esperanza de Vida Ajustados por Calidad de dicha población (ajustada por edad y género), para a continuación proponer una valoración monetaria de los resultados obtenidos. En la segunda parte del trabajo...

  14. Evolución de la mortalidad atribuible al tabaco en las Islas Canarias (1975-1994

    Directory of Open Access Journals (Sweden)

    Bello Luján Luis M

    2001-01-01

    Full Text Available Fundamento: El objetivo de este trabajo es describir la mortalidad atribuible al consumo de tabaco en las Islas Canarias durante el periodo 1975-1994. Método: Las defunciones por edad, sexo y causa desde 1975 a 1994 se obtuvieron del Instituto Nacional de Estadística (Movimiento Natural Población. A partir de las Encuestas de Salud de España y Canarias se tomaron los porcentajes de nunca fumadores, fumadores y ex-fumadores de la población canaria por edad y sexo. Los riesgos relativos de muerte se obtuvieron del Cancer Prevention Study II, llevado a cabo en Estados Unidos de América. Se calculó la proporción de muertes atribuibles al tabaco para cada año, sexo y grupo de edad a partir de la fracción atribuible poblacional. Así mismo, se calculó la tendencia de la mortalidad atribuible para dicho periodo expresada como el cambio porcentual medio anual de las tasas de la mortalidad ajustadas por edad, mediante un modelo log-lineal. Resultados: Durante el periodo 1975-1994, el número de fallecimientos atribuidos al tabaco aumentó un 64%. Por grandes causas, se observó en el periodo de estudio, un aumento de las neoplasias del 108%, una disminución de las enfermedades cardiovasculares del 32% y un incremento de las enfermedades respiratorias del 15,5%. Se observó también que el número de fallecidos aumenta con la edad, siendo el grupo de edad de 65 años y más en el que se presentan más muertes por el tabaco. Conclusiones: En las Islas Canarias, más del 20% de todas las muertes en 1994 se pueden atribuir al tabaco. Esto sugiere que las medidas introducidas para controlar el tabaquismo son insuficientes.

  15. Léxico asociado a los recursos naturales americanos en el español de Canarias

    OpenAIRE

    Cáceres-Lorenzo, María Teresa; Salas-Pascual, Marcos

    2010-01-01

    International audience La formación del léxico peculiar de una región está íntimamente ligado a las circunstancias históricas, económicas y sociales del mismo. La relación entre los territorios americanos y las Islas Canarias se inicia desde el mismo momento del descubrimiento hasta nuestros días. Esta relación puede ejemplificarse de manera perfecta en el vocabulario vinculado a los recursos naturales de origen americano que han determinado la agricultura, parte de la industria, e incluso...

  16. Estudio socioecómico de la reserva de la biosfera de Gran Canaria: propuestas de actuación

    Directory of Open Access Journals (Sweden)

    Silvia Sobral García

    2010-01-01

    Full Text Available En este artículo se aborda el análisis de la Reserva de la Biosfera de la isla de Gran Canaria, espacio de gran valor natural y paisajístico pero afectado de serios problemas económico-demográficos debido al estancamiento poblacional y al proceso de abandono de las actividades tradicionales. Frente a esto se plantean programas centrados en solucionar los principales déficit que afectan a la zona para poder cumplir con los compromisos de desarrollo sostenible que conlleva este reconocimiento internacional.

  17. Obesidad, sobrepeso y trastornos de la conducta alimentaria en Gran Canaria: estudio de la población adolescente

    OpenAIRE

    Álvarez-Malé, Mª Luisa

    2015-01-01

    Programa de doctorado: Salud pública (Epidemiología, planificación y nutrición) [ES]Los objetivos de esta tesis fueron hallar cifras de prevalencia de TCA (Trastorno de la Conducta Alimentaria), obesidad y sobrepeso en jóvenes de la isla de Gran Canaria, obtener datos de prevalencia de riesgo de TCA y estudiar los factores asociados a estos problemas. Se seleccionaron al azar 1342 alumnos de entre 12-20 años de diferentes Centros Educativos. Para hallar la prevalencia diagn&o...

  18. Compromiso de los adolescentes de Canarias con un estilo de vida físicamente activo y saludable

    OpenAIRE

    López López, Eduardo Luis

    2011-01-01

    Programa de doctorado: Avances en Traumatología [ES] El presente estudio tiene un caracter descriptivo y correlacional y se ha aplicado a una muestra de 800 adolescentes: 413 hombres y 387 mujeras, pertenecientes a la Comunidad Autónoma de Canarias. Las variables que componen la investigación están relacionadas con el estado de salud de este sector de la población; niveles de práctica de actividad física, prevalencia de conductas sedentarias, estado psicológico de bienestar, patrón aliment...

  19. Polypharmacy in psychiatric practice in the Canary Islands

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    Sanz Emilio J

    2004-07-01

    Full Text Available Abstract Background Polypharmacy with psychoactive drugs is an increasingly common and debatable contemporary practice in clinical psychiatry based more upon experience than evidence. The objective of this study was to evaluate the prevalence and conditioners of polypharmacy in psychiatric patients. Method A cross-sectional survey was carried out using the Canary Islands Health Service Clinical Records Database. A representative sample (n = 2,647 of patients with mental disorders receiving psychotropic medication was studied. Results The mean number of psychoactive drugs prescribed was 1.63 ± 0.93 (range 1–7. The rate of polypharmacy was 41.9%, with 27.8% of patients receiving two drugs, 9.1% receiving three, 3.2% receiving four, and 1.8% of the patients receiving five or more psychotropic drugs. Multiple regression analysis shows that variables sex and diagnosis have a predictive value with regard to the number of psychotropic drug used, being men and schizophrenic patients the most predisposed. Benzodiazepines were the more prevalent drugs in monotherapy, while anticonvulsants and antipsychotics were the more used in combination with other treatment. A questionable very high degree of same-class polypharmacy was evidenced, while multi-class, adjunctive and augmentation polypharmacy seem to be more appropriate. Conclusions Almost half of the psychiatric patients are treated with several psychotropics. Polypharmacy is common and seems to be problematic, especially when same class of drugs are prescribed together. Some diagnoses, such as schizophrenia, are associated with an increase risk of Polypharmacy but there is a lack of evidence based indicators that allows for quality evaluation on this practice.

  20. El libro y la lectura en Canarias en la Edad Moderna

    Directory of Open Access Journals (Sweden)

    Manuel LOBO CABRERA

    2009-12-01

    Full Text Available RESUMEN: El objeto de este trabajo es dar a conocer la importancia que el libro y la lectura cumplen en el archipiélago desde el final de la conquista hasta fines del siglo XVIII. El análisis se realiza a través de las instituciones implicadas en la enseñanza y los tipos y modos de lectura que se realizan, así como las características de las bibliotecas particulares, su contenido y categoría social de los propietarios. De las mismas se deduce el papel jugado por los sectores profesionales en el acaparamiento y difusión de la lectura, en especial aquellas relacionadas con la Iglesia y con la administración.ABSTRACT: The aim of this paper is to present a picture of the importance that books and reading have had in the Canaries since the end of the Spanish Conquest till the end of the XVIII Century. The analysis is done through the institutions involved in teaching, through the types and ways of reading and also through the characteristics of the prívate libraries, their content and the social class of their owners. The role played by the professional sectors in the capture and difussion of reading are deduced from those characteristics, principally those related to the Church and the Administration.

  1. Evidence for long-term uplift on the Canary Islands from emergent Mio Pliocene littoral deposits

    Science.gov (United States)

    Meco, Joaquín; Scaillet, Stéphane; Guillou, Hervé; Lomoschitz, Alejandro; Carlos Carracedo, Juan; Ballester, Javier; Betancort, Juan-Francisco; Cilleros, Antonio

    2007-06-01

    Several islands in the Canarian archipelago show marine deposits with identical fossil faunas, which are generally assigned to different glacioeustatic marine episodes: mainly Pleistocene episodes in Lanzarote and Fuerteventura, and Mio-Pliocene ones in Gran Canaria. Three fossil species ( Saccostrea chili, Nerita emiliana and Strombus coronatus) characterize all the marine deposits from southern Lanzarote, to the west and south of Fuerteventura and northeast of Gran Canaria. Three other species ( Ancilla glandiformis, Rothpletzia rudista and Siderastraea miocenica) confirm the chronostratigraphic attribution of these deposits. Other more occasional fossils (as Chlamys latissima, Isognomon soldanii and Clypeaster aegyptiacus) fit an upper Miocene and lower Pliocene age. This agrees with new K/Ar ages obtained from pillow lavas emplaced into the marine deposits (ca. 4.1 Ma in Gran Canaria, ca. 4.8 Ma in Fuerteventura) and from underlying (ca. 9.3 Ma in Gran Canaria) or overlying (ca. 9.8 Ma in Lanzarote) lava flows. The marine deposits are eroded but large continuous segments are preserved sloping gently towards the coast. Variations in the highest and the lowest elevations of the deposits apsl (above present sea level) indicate post-depositional uplift movements. Glacioeustatic causes are unlikely to be responsible for these variations on the basis of the coastal location of the deposits and their equatorial fauna characteristic of Mio-Pliocene corals. Differential uplift of the deposits across the archipelago is argued to result from the progressive seaward tilting of the islands along the insular volcanic trail marking the westward migration of hot spot head since 20 Ma. Successive westward accretion of younger volcanic edifices resulted in increasing lithostatic load of the crust with progressive (diachronous) tilting of the older edifices and their palaeo-shorelines marked by past coastal deposits.

  2. Calosotinae and Neanastatinae in the Iberian Peninsula and Canary Islands, with descriptions of new species and a supplementary note on Brasema Cameron, 1884 (Hymenoptera, Chalcidoidea, Eupelmidae

    Directory of Open Access Journals (Sweden)

    Askew, R. R.

    2006-06-01

    Full Text Available Recognized as occurring in the Iberian Peninsula and Canary Islands are nine species of Calosota, seven species of Eusandalum and one species of Pentacladia in Calosotinae, and one species each of Metapelma and Neanastatus in Neanastatinae. Taxonomic and biological data, keys to species of Calosota and Eusandulum, and descriptions of two new species of Calosota are provided. The following new synonymies are proposed: Calosota fumipennis Bolívar under C. aestivalis Curtis, C. lixobia Erdös under C. obscura Ruschka, C. matritensis Bolívar and C. modesta Bolívar under C. viridis Masi. A supplementary note on Brasema (Eupelminae in Spain is appended with Brasema ephedricola Askew synonymized under Brasema stenos (Boucek (new combination.

    Se revisan las especies de la Península Ibérica e Islas Canarias de las subfamilias Calosotinae y Neanastatinae (Eupelmidae. En Calosotinae se reconocen nueve especies de Calosota, siete de Eusandalum y una de Pentacladia, mientras que Neanastatinae incluye una especie de Metapelma y una de Neanastatus. Se aportan datos taxonómicos y biológicos, claves de identificación de las especies de Calosota y Eusandalum, y se describen dos especies nuevas para la ciencia de Calosota. Se proponen las siguientes sinonimias: Calosota fumipennis Bolívar con C aestivalis Curtis, C. lixobia Erdös con C. obscura Ruschka; C. matritensis Bolívar y C. modesta Bolívar con C. viridis Masi. Finalmente se añade una nota suplementaria sobre Brasema (Eupelminae y Brasema ephedricola Askew se sinonimiza con Brasema stenus (Boucek (combinación nueva.

  3. The conditions for use of reed canary grass briquettes and chopped reed canary grass in small heating plants; Foerutsaettningar foer anvaendning av roerflensbriketter och hackad roerflen i mindre vaermecentraler

    Energy Technology Data Exchange (ETDEWEB)

    Paulrud, Susanne; Davidsson, Kent; Holmgren, Magnus A. (Swedish National Testing and Research Inst., Boraas (Sweden)); Hedman, Henry; Oehman, Rikard; Leffler, Joel (ETC, Piteaa (Sweden))

    2010-09-15

    The aim of this study was to test fuel blends of briquettes and chopped reed canary grass in three existing heating plants (50 kW - 500 kW) and elucidate the requirements for good performance and low emissions. In addition, the study investigated production of reed canary grass briquettes using a Polish screw press developed for straw. Some tests with a bale shredder were also undertaken. The screw press technique is of interest for reed canary grass because it is a simple technique, easy to handle, developed for small scale production, and for straw. The test with reed canary grass in this study showed that the technique worked well but that further adjustments and a longer test period are needed in order to achieve higher bulk density and mechanical strength. The test with chopped reed canary grass shows that a system with a forage harvester is slightly more effective than baling and cutting in a bale shredder. The study concluded that few existing heating plants of size 50 kW-1 MW that currently use wood fuels will be able to use reed canary grass without adjustment, conversion or replacement of the combustion equipment. Reed canary grass has 15-20 times higher ash content than wood briquettes and 2-3 times higher ash content than forest residue; the combustion equipment must be able to handle these properties. The boiler must be equipped with a continuously operating ashing system and it must be possible to move the ash bed mechanically. There is a risk of high content of unburned matter if the residence time in the boiler is too short, due to the structure and low bulk density of the reed canary grass ash. Using a blend of wood briquettes and reed canary briquettes results in lower ash content, but also affects the ash chemistry and tends to lower the initial ash fusion temperature compared to using 100 % reed canary grass. Blending chopped reed canary grass and wood chips in an existing small scale heating plant also requires measures to achieve an even fuel

  4. A new species of Sarcodictyon (Anthozoa: Stolonifera) from Tenerife, Canary Islands

    NARCIS (Netherlands)

    Ocaña, O.; Brito, A.; Nuñez, J.

    1992-01-01

    A new species of Stolonifera, Sarcodictyon canariensis, from Tenerife, Canary Islands, is described and illustrated. It is characterized by its large size, the form of its sclerites and internal anatomy. The material was collected at a depth of 95-130 m in the community of Dendrophyllia ramea (Linna

  5. Demographic history of Canary Islands male gene-pool: replacement of native lineages by European

    Directory of Open Access Journals (Sweden)

    Amorim António

    2009-08-01

    Full Text Available Abstract Background The origin and prevalence of the prehispanic settlers of the Canary Islands has attracted great multidisciplinary interest. However, direct ancient DNA genetic studies on indigenous and historical 17th–18th century remains, using mitochondrial DNA as a female marker, have only recently been possible. In the present work, the analysis of Y-chromosome polymorphisms in the same samples, has shed light on the way the European colonization affected male and female Canary Island indigenous genetic pools, from the conquest to present-day times. Results Autochthonous (E-M81 and prominent (E-M78 and J-M267 Berber Y-chromosome lineages were detected in the indigenous remains, confirming a North West African origin for their ancestors which confirms previous mitochondrial DNA results. However, in contrast with their female lineages, which have survived in the present-day population since the conquest with only a moderate decline, the male indigenous lineages have dropped constantly being substituted by European lineages. Male and female sub-Saharan African genetic inputs were also detected in the Canary population, but their frequencies were higher during the 17th–18th centuries than today. Conclusion The European colonization of the Canary Islands introduced a strong sex-biased change in the indigenous population in such a way that indigenous female lineages survived in the extant population in a significantly higher proportion than their male counterparts.

  6. Hygrocybe monteverdae, a new species of subgenus Cuphophyllus (Agaricales) from the Canary Islands (Spain)

    OpenAIRE

    Bañares, Á.; Arnolds, E.

    2002-01-01

    Hygrocybe monteverdae, collected in monte-verde forest in the Canary Islands, is proposed as a new species belonging to subgenus Cuphophyllus. Its most remarkable character is the blackening lamellae after drying, being the sole species with this feature in the subgenus.

  7. Aphids and their parasitoids on the Canary grass, Phalaris canariensis in Malta (Hymenoptera, Braconidae, Aphidiinae)

    OpenAIRE

    Stankovic, Sasa; Stary, Petr; Mifsud, David

    2013-01-01

    Adialytus ambiguus and Diaeretiella rapae were reared from Rhopalosiphum padi on the Canary grass, Phalaris canariensis in Malta. The identity to species level of the Adialytus required confirmation via DNA analysis of the respective species group. Some ecosystem interrelationships derived from the determined food webs are discussed.

  8. Boring sponges (Porifera, Clionidae) collected during the "Tydeman" Canary Islands expedition Cancap-II, 1977

    NARCIS (Netherlands)

    Groot, de R.A.

    1980-01-01

    INTRODUCTION AND MATERIAL The boring sponges of the Canary Islands have never been studied in any detail, but the boring fauna of this archipelago cannot be expected to be very rich. All islands are volcanic and calcareous rocks are not common. Consequently, in most areas large shells and rhodophyte

  9. [European expansion and aboriginal demographics. The example of the Canary Islands, 1400-1505].

    Science.gov (United States)

    Macias Hernandez, A M

    1992-01-01

    The author examines the indigenous population of the Canary Islands from the thirteenth century to 1505. He uses the limited available data to describe the effect of contact with and eventual colonization by Spain on such aspects as spatial distribution, mortality, and forced labor migration to the Continent. Comparisons are made with the indigenous experience in the Americas.

  10. Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin

    NARCIS (Netherlands)

    Gerringa, L. J. A.; Veldhuis, M. J. W.; Timmermans, K. R.; Sarthou, G.; de Baar, H. J. W.

    2006-01-01

    Dissolved Fe and ligand concentrations and the Fe-binding strength of the organic ligands were measured in samples from the upper water column (150 m) of the oligotrophic waters of the Canary Basin (eastern North Atlantic Ocean). Concentrations of major nutrients, phytoplankton abundance and photosy

  11. Stygofauna of the Canary Islands, 8 Amphipoda (Crustacea) from inland groundwaters of Fuerteventura

    NARCIS (Netherlands)

    Stock, Jan H.

    1988-01-01

    New material of Bogidiella from Fuenteventura (Canary Islands) provided evidence that the specimens of the genus previously recorded from inland groundwaters belong to a species new to science: B. (Stygogidiella) purpuriae, closely related to the thalassostygobiont, B. (S.) uniramosa from Lanzarote.

  12. Stygofauna of the Canary Islands, 13 Die Polychaeten der Sammelreisen 1985 und 1987

    NARCIS (Netherlands)

    Hartmann-Schröder, Gesa

    1988-01-01

    Fifteen species of Polychaeta have been studied, two of which not identifyable to species level. Ten species are recorded from the Canary Islands for the first time. The majority of the species is distributed more or less widely in the warmer parts of the oceans, 2 are cosmopolitan. Namanereis humme

  13. Aplicación de la datación por termoluminiscencia a materiales cerámicos prehistóricos de Gran Canaria 

    OpenAIRE

    Santana Duchement, Gloria

    2000-01-01

    [ES] La falta de datos cronológicos en la prehistoria de Gran Canaria, obliga a buscar alternativas viables e interdisciplinares. En este trabajo, se experimenta en la adaptación de los materiales cerámicos al del análisis por termoluminiscencia.

  14. Los orígenes del Instituto provincial de higiene de las Canarias orientales y la sanidad municipal (1926-1927: cambios estructurales y asistenciales

    Directory of Open Access Journals (Sweden)

    Martín del Castillo, Juan Francisco

    2005-12-01

    Full Text Available The «Instituto Provincial de Higiene de las Canarias Orientales» is an example of Estatuto Provincial of José Calvo Sotelo (1925. Involved in administrative affaires and economical distributions between the Townhall of Las Palmas de Gran Canaria and Insular Council, its beginning is labour of Doctor Antonio Ortiz de Landázuri, in that moment Health Inspector. In this paper, be described the structure and functions of Hygiene Institute, so the change of technical members of laboratories and stations of previous town health services.

    El Instituto Provincial de Higiene de las Canarias Orientales es un ejemplo de la puesta en marcha del Estatuto Provincial de José Calvo Sotelo (1925. Envuelto en medidas administrativas y repartos financieros entre el Ayuntamiento de Las Palmas de Gran Canaria y el Cabildo Insular, su inicio es obra directa del doctor Antonio Ortiz de Landázuri, en aquellos momentos al cargo de la Inspección de Sanidad. En el presente, quedan descritos la estructura y funciones del Instituto de Higiene, además del pase de los miembros facultativos de los laboratorios y estaciones de anteriores servicios municipales del ramo.

  15. Delimitación y protección ambiental de los espacios marítimos de Canarias desde la perspectiva internacional

    OpenAIRE

    Rodríguez Domínguez, Carlos

    2009-01-01

    El presente trabajo está dedicado al estudio del marco jurídico internacional y comunitario aplicable a la delimitación y protección medioambiental de los espacios marítimos del Archipiélago Canario. Su objetivo principal es arrojar luz sobre un tema complejo y de candente actualidad en Canarias.

  16. Aspectos volcanológicos y estructurales. Evolución petrológica e implicaciones en riesgo volcánico de la erupción de 1730 en Lanzarote. Islas Canarias

    Directory of Open Access Journals (Sweden)

    Soler, V.

    1990-04-01

    Full Text Available The eruption that took place in Lanzarote between 1 September 1730 and 16 April 1736 differs from the normal pattern of the historic (last 500 years volcanism of the Canary Islands. The duration (2.053 days, extension (200 km2, volume of materials emitted (3-5 km3 and the evolution of magmas towards olivine tholeiite compositions are quite unique in the historic trend of volcanism in the Archipelago. However, no specific study has been undertaken until now to attempt its reconstruction. In this work the detailed geologic mapping (on a scale 1: 10.000 of the area was carried out, in addition to a thorough petrologic study and the correlation of data provided by eye witness accounts, one of which is a hitberto unpublished manuscript. The main phases of activity have been differentiated as a function of important changes in the composition of the magmas and of the relationship of tbe eruption with a large (at least 14 km fracture. The petrologic and geochemical study of 51 stratigraphically and temporally well located samples shows significant changes in the magma generation processes and in the internal feeding system of the eruption. Magmas evolve from nepheline basanites to alkali basalts (7 to 12,5 % melting during the initial phase of the eruption and from the second phase onwards from alkali basalts to olivine tholeiites (13 to 20 % melting, at shallower depths. Trace elements analysis indicates the predominant role of partial melting processes. The «anomalous» nature of this eruption in relation to the historic volcanism of the Canaries might be explained by the continuation of the eruption once the initial phase was completed (some 3-5 months, when the magma generation front was raised and placed at ao intermediate depth along a large fracture.La erupción ocurrida en Lanzarote entre elide septiembre de 1730 y el 16 de abril de 1736 es por su duración (2.053 días, extensión (200 km2 y volumen (3-5 km3 de materiales emitidos, y

  17. Geomorphological characteristics of recent debris flows in the monogenic basaltic volcan of Red Mountain (Tenerife, Canary Islands, Spain); Caracteristicas geomorfologicas de los debris flows recientes del volcan basaltico monogenico de Montana Roja (Tenerife, Canarias, Espana)

    Energy Technology Data Exchange (ETDEWEB)

    Doniz Paez, F. J.; Romero Ruiz, C.; Coello de la Plaza, E.; Criado, C.

    2009-07-01

    Debris flows are some of the remodelling processes that highly affect cinder cones. the formation of debris flows in Montana Roja volcano during an episode of heavy rain permitted us to evaluate the features characterising these forms. they present a diverse morphology, from simple linear debris, with only one channel and a lentil-shaped lobe, to complex debris of sinuous layouts, with several channels that bifurcate, and multi-lobular fronts. (Author) 4 refs.

  18. Siliceous alterations of the Montana Senalo lavas, Timanfaya eruption (1730-1736) (Lanzarote, Canary Islands); Las alteraciones siliceas de las lavas de Montana Senalo, eruption de Timanfaya (1730-1736) (Lanzarote, Islas Canarias)

    Energy Technology Data Exchange (ETDEWEB)

    Carmona, J.; Romero, C.; Doniz, J.; Garcia, A.

    2009-07-01

    The presence of hydrothermal alterations within the lavas of Timanfaya eruption (1730-1736), with high proportions of quartz and opal, suggests the effective circulation of hot fluids. The source of these fluids would be located under the island, where silica would be dissolved from sandstones and radiolarites, moving this way towards the surface as Si(OH){sub 4} colloids. Study of opal indicates the presence of A-initial CT and C phases in the collected samples, which, considering the time needed for producing this phase transformations in the diagenetic evolution of opal (10,000-50,000 years), suggests an accelerating process, probably related with either the presence of fluid circulation or weathering processes. Such circumstances are necessary for explaining the presence of such components affecting 300 years old lavas. (Author) 36 refs.

  19. REE: Alkaline intensive and carbonates complexes at Fuerteventura (Canary Islands). Mineralizaciones de tierras raras: los complejos de rocas plutonicas alcalinas y carbonatitas del complejo basal de Fuerteventura (Islas Canarias)

    Energy Technology Data Exchange (ETDEWEB)

    Mangas Viuela, J.; Perez Torrado, F.J.

    1993-01-01

    Alkaline intrusive complexes at Fuerteventura have been explored as potential source of REE. Two main complexes constituted by ultramafic to salic rocks and carbonatitas are present in the island: the Puerto de la Pea-Cueva de Lobos (= 60 Ma) in the western centerpoint and the Esquinzo (=30 Ma) in the northern zone. The calciocarbonatites (sovites and alwikites), formed in the last crystallization phases of these complexes, show the highest values of REE (511-7,372 ppm) and these elements mainly are associated with carbonates (synchysite), phosphates (REE apatite), silicates (allanite). (Author) 17 refs.

  20. Geología y vulcanología de La Palma y El Hierro, Canarias Occidentales

    Directory of Open Access Journals (Sweden)

    Pérez Torrado, F. J.

    2001-12-01

    Full Text Available The western Canaries, relatively little studied until a few years ago from the geological point of view, have however provided decisive data for understanding many of the most important geological problems of the Archipelago, which would probably have been dilucidated earlier, had the study begun with the most recent islands, as occurs in similar chains of oceanic volcanic islands in other parts of the world. To summarize the main geological features and evolutionary characteristics of both islands we emphasize the following stages of development: During the Pliocene, a submarine volcanic edifice or seamount formed in the island of La Palma, made up of pillow lavas, pillow breccias and hyaloclastites, intruded by trachytic domes, plugs of gabbros, and a highly dense dyke swarm. The intense magmatic and dyke intrusion uplifted the searnount up to 1,500 m, tilting it 45-50" to the SW. This intrusive phase was followed by a period of quiescence and erosion of the emerged submarine edifice. The definitive consolidation and progression of the construction of the island continued from at least 1.77 ma in angular and erosive discordance over the submarine basement. The subaerial volcanic reactivation, in which explosive volcanism predominated during the initial stages, producing abundant volcanoclastic and phreatomagmatic materials at the base of the subaerial edifice, persisted in a highly continuous manner until at least 0.41 ma. This initial subaerial stage shaped the northern volcanic shield, formed by the accumulation of several superimposed volcanoes, approximately concentric in relation to one another and the submarine basement. The initial stage of the northern volcanic shield lasted between 1.77 and 1.20 ma, during which period the Garafía volcano was built to a height of 2,500-3,000 m, with steeply sloping flanks, formed predominantly by alkaline basalts with abundant pahoehoe lavas. The rapid growth and progressive instability of the Garaf

  1. Promoción turística a través del sector audiovisual. El caso de Canarias

    Directory of Open Access Journals (Sweden)

    Lic. María Teresa Sandoval Martín

    1998-01-01

    Full Text Available El cine ha posibilitado desde su nacimiento, en 1895, la divulgación por todo el mundo de imágenes de los lugares más célebres y remotos del planeta. En España, principalmente durante la dictadura de Primo de Rivera, la producción de filmes por provincias iría en incremento. Concretamente en Canarias, por aquel entonces, comenzaba a tomarse conciencia del poder que tenía la gran pantalla como medio de promoción turística. Pero no existió el suficiente apoyo institucional, por lo que serían los documentales realizados por empresas privadas -en su mayoría foráneas- los que contribuirían a difundir las primeras imágenes de estas islas en el exterior. Las películas de ficción y los documentales antiguos no siempre ofrecieron un retrato positivo del archipiélago, al igual que ocurriría mucho más tarde con algunos reportajes y programas difundidos por televisión, aunque estos son sólo casos aislados. La mayoría de las veces su aportación a la promoción de Canarias ha sido significativa. Destacan, sobre todo, las películas de argumento (cinematográficas y televisuales de directores de diferentes nacionalidades que situaban la acción real en las islas y en las que se narraban historias protagonizadas por grupos de veraneantes. No obstante, la mayor parte de los largometrajes más famosos internacionalmente utilizaron las variadas localizaciones de este territorio para representar otros lugares. Aún así, la publicación de artículos en la prensa extranjera sobre el desarrollo de los rodajes favorecería la divulgación de sus singularidades. Además de este tipo de promoción indirecta, las instituciones canarias han venido realizando desde principios de la década de los noventa originales campañas de promoción a través del sector audiovisual de demostrada eficacia. Asimismo, la calidad de las producciones cinematográficas realizadas por canarios en los últimos años ha posibilitado que hayan sido seleccionadas en

  2. ESTILO DE VIDA Y ADHERENCIA AL TRATAMIENTO DE LA POBLACIÓN CANARIA CON DIABETES MELLITUS TIPO 2

    Directory of Open Access Journals (Sweden)

    Antonio Cabrera de León

    2009-01-01

    Full Text Available Fundamento: la población canaria sufre la mayor mortalidad por diabetes tipo 2 (DM2 en España. El objetivo de este estudio es conocer el estilo de vida de las personas diabéticas del archipiélago y su adherencia al tratamiento, así como la DM2 desconocida. Métodos: estudio transversal de 6.729 personas de la población general participantes en la cohorte "CDC de Canarias" (edad 18-75 años. Se obtuvieron sus antecedentes médicos, dieta, actividad física, medicamentos consumidos, tabaco, etc. Resultados: la prevalencia de DM2 fue 12% en varones y 10% en mujeres (p=0,005. El 22%de varones y 9% de mujeres desconocían su enfermedad (p<0,001. Sumando DM2 desconocida, DM2 no tratada e incumplimiento terapéutico, el 48% de los hombres y 28% en mujeres no seguían tratamiento correcto. Los varones diabéticos eran más obesos que los no diabéticos (45 versus 25%; p<0,001 pero no presentaban diferencias en tabaquismo (28%; IC95%=23-33 o sedentarismo (62%; IC95%=56-68. Las mujeres diabéticas también eran más obesas (54 versus 27%; p<0,001 y, aunque fumaban menos (11 versus 22%; p<0,001, eran igual de sedentarias (75%; IC95%=70-79. La ingesta calórica era menor en quienes sufrían DM2 (p<0,001, pero el 93% (IC95%=91-95 superaba el consumo recomendado de grasas saturadas y el 69% (IC95%=65-72 padecía síndrome metabólico. Conclusiones: la población diabética en Canarias es sedentaria y obesa, muestra un consumo alto de grasas saturadas y gran prevalencia de síndrome metabólico. El porcentaje que sigue tratamiento regular es muy bajo, sobretodo en varones, que además mantienen el tabaquismo.

  3. Metasomatism in the oceanic lithosphere beneath La Palma, Canary Islands

    Science.gov (United States)

    Janisch, Astrid; Ntaflos, Theodoros

    2016-04-01

    La Palma is the most active island within the Canary archipelago with historical eruption along the Cumbre Vieja Rift. Mantle peridotite xenoliths brought to the surface during the eruption 1677/78 at the site of San Antonio Volcano, close to Fuencaliente in the south of the island, gives us an excellent opportunity to study an old oceanic lithosphere. The collection of xenoliths comprises sp-harzburgites, sp-lherzolites, sp-dunites and pyroxenites but only the first three were used for this work. Metasomatic processes are evident in all samples. A common feature is a variable channelling of melt flow through the mantle xenoliths displayed in variations from pervasively metasomatized, through veined to dyke intruded peridotites. Orthopyroxene breakdown into olivine, clinopyroxene and glass is evidence for anhydrous melt percolation. Furthermore, fine-grained veins in various thicknesses consisting of olivine, pyroxene as well as amphibole with apatite and phlogopite reveal additional anhydrous and hydrous metasomatic processes, respectively. Peridotites mainly influenced by anhydrous metasomatism exhibit locally phlogopite and/or amphibole around spinel or in glass-veinlets. Pentlandite has been found in all veined samples. Amphiboles are mostly pargasites but kaersutites are also present in the amphibole-bearing veins. Two different types of amphibole veins have been recognized. The first type is an amphibole-apatite-glass-bearing amphibolite, forming a cross-cutting vein that propagates through the xenolith. The amphiboles in this vein are coarse-grained while the disseminated amphiboles are fine-grained. Clinopyroxene always occurs in association with amphibole and in textural equilibrium suggesting that both minerals have grown together. The glass is of tephritic/basanitic to trachy-basaltic composition. The second amphibole-vein contains phlogopite and traces of apatite. Textural evidence (cross-cutting olivine grains and the absence of hydrous minerals in the

  4. El Proyecto Humboldt: Una biblioteca digital para las expediciones científicas a las Islas Canarias*

    Directory of Open Access Journals (Sweden)

    Markus Schnoepf

    2005-04-01

    Full Text Available Article in Spanish, Abstracts in English, Spanish and German.The Proyecto Humboldt offers since 2002 a growing digital library for the investigation of the european scientific voyages to the Canary Islands between 1700 and 1900. The library is led by the Open Access spirit. Some results of the research work of the last years will be presented in this text. General comments on digital libraries and coming developments will be discussed in another part. Finally the special relationship of the humanities and computer-aided work will be looked at.

  5. Probabilistic risk assessment of common booster biocides in surface waters of the harbours of Gran Canaria (Spain).

    Science.gov (United States)

    Sánchez-Rodríguez, Alvaro; Sosa-Ferrera, Zoraida; Santana-del Pino, Angelo; Santana-Rodríguez, José Juan

    2011-05-01

    The presence of booster biocides in the aquatic environment has been associated with a risk to non-target species due to their proven toxicity. The aim of the present study was to determine the spatial and temporal distribution of common booster biocides in different harbours of the island of Gran Canaria (Spain) and evaluate, by means of a probabilistic risk assessment (PRA), the ecological risk posed by these compounds. With these objectives, a monitoring campaign was conducted between January 2008 and May 2009, collecting a total of 182 seawater samples. Four common booster biocides (TCMTB, diuron, Irgarol 1051 and dichlofluanid) were monitored. Diuron levels ranged between 2.3 and 203 ng/L and Irgarol 1051 between 2.4 and 146.5 ng/L. The ecological risk associated with these levels was always low, however, with probabilities of exceeding the 10th percentile of autotroph toxicity below 3.5%. PMID:21396664

  6. Análisis de la nueva Ley de Radio y Televisión Pública de Canarias

    OpenAIRE

    R Zallo

    2015-01-01

    La nueva Ley de Radio y Televisión Públicas de la Comunidad Autónoma de Canarias (Ley 13/2014, de 26 de diciembre), y que sustituye a la anterior, aparece en un momento delicado para las radiotelevisiones autonómicas, hoy puestas en cuestión desde varios frentes. También se produce como aplicación del doble marco de la Ley General de Comunicación Audiovisual de 2010 y de su modificación por la ley 6/2012, de 1 de agosto y que flexibilizaba los modos de gestión de los canales públicos de telev...

  7. Modelo conceptual del sistema acuífero de Enchereda (La Gomera, Islas Canarias: contribuciones a otras islas volcánicas

    Directory of Open Access Journals (Sweden)

    Izquierdo, T.

    2011-06-01

    Full Text Available Hydrogeological conceptual models are difficult to develop in volcanic islands due to scarce hydrogeologic information in the inner parts of the islands and the complex structure of volcanic materials. This complexity is increased by 1 destruction processes (for example, flank collapse and 2 dike intrusion. Dikes can both channel groundwater flow parallel to their general trend or act as barriers impounding it. In this paper we evaluate the role of dikes and volcanoclastic deposits in Enchereda aquifer system (La Gomera, Canary Islands regional flow and particularly, in its higher area. In this aquifer system three hydrostratigraphic units can be identified: the Lower Old Basalts, with low permeability; the Volcanic Breccia, impermeable; and the Upper Old Basalts, permeable. The breccia seems to act as the impermeable limit of the aquifer and the reconstruction of its geometry shows a coherent surface dipping about 13º towards the ESE what determines the regional flow in the aquifer. After dike mapping using aerial photograph and orthophotograph as well as mapping in the field and inside Ipalán water tunnel, four dike swarms have been identified. NW-SE dikes are the most frequent ones, and show a maximum density of more than 10 dikes/100 m, similar to rift zones in volcanic islands. These dikes are parallel to the regional flow and channel water flow whereas the N-S and NE-SW swarms impound groundwater rising the water table level forming a stepped surface as they are perpendicular to the regional flow. Lastly, W-E dikes do not seem to have any significant influence on the aquifer. Our results show the need of a re-evaluation of the role of dikes in the regional flow in other volcanic island aquifers in which their influence have been minimized as overlapping of different dike swarms can condition regional flow in the aquifer.

    La elaboración de modelos conceptuales en acuíferos de islas volcánicas presenta una elevada dificultad

  8. First larval record of Mesocestoides in carnivora of Tenerife (Canary Islands).

    Science.gov (United States)

    Foronda, Pilar; Pérez Rivero, Alfredo; Santana Morales, María A; Kabdur, Alicia; González, Ana C; Quispe Ricalde, M Antonieta; Feliu, Carlos; Valladares, Basilio

    2007-02-01

    Larvae of Mesocestoides sp. were recovered in Tenerife (Canary Islands) in 2004 from the peritoneal cavities of 2 domestic dogs and a domestic cat. Morphological and molecular identification were carried out. Mesocestoides litteratus from Vulpes vulpes was sequenced for the first time using the ITS-2 region (18S rDNA), and was included in the phylogenetic analysis to compare the sequence variability among these and other Mesocestoides spp. belonging to different carnivores. Phylogenetic studies were carried out based on maximum parsimony and neighbor-joining analysis. The results showed the relationships between these and other previously published Mesocestoides species. Moreover, it is demonstrated that Mesocestoides sp. from Tenerife comprises a previously unreported sequence. This is the first larval record of Mesocestoides sp. in domestic animals from Tenerife, Canary Islands, Spain.

  9. Mitochondrial DNA diversity in 17th-18th century remains from Tenerife (Canary Islands).

    Science.gov (United States)

    Maca-Meyer, Nicole; Cabrera, Vicente M; Arnay, Matilde; Flores, Carlos; Fregel, Rosa; González, Ana M; Larruga, José M

    2005-08-01

    Mitochondrial DNA sequences and restriction fragment length polymorphisms were retrieved (with >80% efficiency) from a 17th-18th century sample of 213 teeth from Tenerife. The genetic composition of this population reveals an important ethnic heterogeneity. Although the majority of detected haplotypes are of European origin, the high frequency of sub-Saharan African haplotypes (15.63%), compared to that of the present-day population (6.6%), confirms the importance of the Canary Islands in the black slave trade of that epoch. The aboriginal substrate, inferred from the U6b1 haplotypes (8.59%), has also decreased due to European input. Finally, the presence of Amerindian lineages (1.5%) reveals that the Canary Islands have also received genetic flow from America.

  10. The helminth fauna of the barbary partridge Alectoris barbara in Tenerife, Canary Islands.

    Science.gov (United States)

    Foronda, P; Casanova, J C; Figueruelo, E; Abreu, N; Feliu, C

    2005-06-01

    The helminth fauna of the barbary partridge (Alectoris barbara) in Tenerife Island (Canary Archipelago) was studied from 2001 to 2002, as there were no records of helminths from this host in the Canary Islands. Seven helminth species were identified: two cestodes Choanotaenia infundibulum and Lyruterina nigropunctata, and five nematodes Aonchotheca caudinflata, Baruscapillaria obsignata, Eucoleus annulatus, Ascaridia galli and Heterakis gallinarum. Lyruterina nigropunctata, A. galli and E. annulatus are recorded for first time in A. barbara. An analysis of available data on Alectoris spp. reveals the importance of intermediate hosts such as arthropods and earthworms in the diet of partridges. Terrestrial helminths are dominant species, with monoxenous and heteroxenous species being present in similar numbers in different Alectoris species along their geographical distribution. Helminth species found in Tenerife from A. barbara are poor indicators of the host colonization from North Africa because these helminths are species that are commonly found in fowl with a cosmopolitan distribution.

  11. EVALUATING THE IMAGE OF TOURISM DESTINATIONS. THE CASE OF THE AUTONOMOUS COMMUNITY OF THE CANARY ISLANDS

    Directory of Open Access Journals (Sweden)

    Roxana - Andreea SARAGEA

    2011-12-01

    Full Text Available In the context of increased competition on the international tourism market, the assessment of destination image has become a research subject for both managers aiming to improve destination positioning and academic researchers. In order to obtain a competitive advantage, every tourist destination must identify, maintain and reinforce, through appropriate marketing policies, unique items that form and build over time "the destination' s image". Accordingly, the ultimate target of the tourist destinations' promoters should be to achieve a high level of coincidence between the promoted or projected image and the perceived image of the destination, held by potential and actual tourists. Therefore, the aim of this paper is to illustrate promotional techniques and methods used by the authorities of the Canary Islands over the years (projected image, and to identify, through a survey among the citizens of Braşov, the image that they have of the Canary Islands (perceived image.

  12. Confirmation of the presence of Ischnura senegalensis (Rambur, 1842 on the Canary Islands

    Directory of Open Access Journals (Sweden)

    Sánchez–Guillén R. A.

    2015-05-01

    Full Text Available The presence of one or two species of damselflies of the genus Ischnura in the Canary Islands has been a matter of debate in the recent years. The first published records listed I. senegalensis as the only zygopteran inhabiting the archipelago, but this proved to be wrong, and until recently, all specimens of Ischnura captured in the islands were unanimously regarded as belonging to I. saharensis. Recent photographic evidence, however, is compatible with the presence of I. senegalensis. In this study, we give morphological and genetic evidence of the presence of I. senegalensis in the Canary Islands, and we discuss the importance of voucher specimens to correctly identify very similar species.

  13. William Herschel Telescope site characterization using the MOAO pathfinder CANARY on-sky data

    CERN Document Server

    Martin, O A; Gendron, E; Rousset, G; Vidal, F; Morris, T J; Basden, A G; Myers, R M; Ono, Y H; Neichel, B; Fusco, T

    2016-01-01

    Canary is the Multi-Object Adaptive Optics (MOAO) pathfinder for the future MOAO-assisted Integral-Field Units (IFU) proposed for Extremely Large Telescopes (ELT). The MOAO concept relies on tomographically reconstructing the turbulence using multiple measurements along different lines of sight. Tomography requires the knowledge of the statistical turbulence parameters, commonly recovered from the system telemetry using a dedicated profiling technique. For demonstration purposes with the MOAO pathfinder Canary , this identification is performed thanks to the Learn & Apply (L&A) algorithm, that consists in model- fitting the covariance matrix of WFS measurements dependent on relevant parameters: $C_n^2(h)$ profile, outer scale profile and system mis-registration. We explore an upgrade of this algorithm, the Learn 3 Steps (L3S) approach, that allows one to dissociate the identification of the altitude layers from the ground in order to mitigate the lack of convergence of the required empirical covarianc...

  14. Annotated checklist of Capitellidae (Annelida, Polychaeta) from the Iberian Peninsula, Chafarinas, Balearic and Canary Islands

    OpenAIRE

    M. El Haddad; Capaccioni Azzati, R.; García-Carrascosa, A. M.

    2013-01-01

    The present annotated checklist has been elaborated after revision of preserved materials (from the Museo Nacional de Ciencias Naturales, Madrid and the reference collection of the Marine Biology Laboratory of the University of Valencia) and published literature related to capitellids from the Iberian Peninsula, Chafarinas, Balearic and Canary Islands. Twenty-four species and subspecies belonging to thirteen genera are recognized as valid taxa. With this checklist we include some taxonomic de...

  15. Herpesvirus infection with severe lymphoid necrosis affecting a beaked whale stranded in the Canary Islands.

    Science.gov (United States)

    Arbelo, Manuel; Sierra, Eva; Esperón, Fernando; Watanabe, Tatiane T N; Bellière, Edwige N; Espinosa de los Monteros, Antonio; Fernández, Antonio

    2010-04-01

    This report describes the pathologic findings in a single, adult female Cuvier's beaked whale Ziphius cavirostris stranded in the Canary Islands. The study indicated that this whale died with a severe, systemic, herpesviral infection and clearly exhibited lesions different from those of the fat and gas embolic syndrome described in beaked whale mass strandings associated with sonar exposure. This is the first report of a cetacean alphaherpesvirus infection of the lymphoid system in a beaked whale.

  16. The challenges of the Canary Islands’ wine sector and its implications: A longitudinal study

    OpenAIRE

    Abel Duarte Alonso; Yi Liu

    2012-01-01

    News and reports acknowledge the challenges that Spanish wine regions are facing, including the Canary Islands, where wine designations of origin (DOs) have existed for less than two decades. The present study extends from preliminary research conducted on the islands’ wine industry to delve into the developments that continue to unfold in the archipelago’s wine sector. Winery owners, wine makers and managers of 55 wineries located in the six wine producing islands participated in face-to-fac...

  17. Engineering Geological Properties of the Volcanic Rocks and Soils of the Canary Islands

    OpenAIRE

    González de Vallejo, Luis I.; Hijazo Ramiro, Teresa; Ferrer Gijón, Mercedes

    2008-01-01

    This paper analyses the engineering geological properties of the rocks and soils of the Canary Islands based on data from field studies, laboratory tests and extensive databases for volcanic materials. Geological properties and processes most relevant to geo-engineering are described. Geomechanical characterization of rock masses and soil deposits including rock mass classification, index and strength properties are presented. Some of the most relevant results show materials of low t...

  18. Depth profile of 236U/238U in soil samples in La Palma, Canary Islands

    OpenAIRE

    Srncik, M.; P. Steier; Wallner, G.

    2011-01-01

    The vertical distribution of the 236U/238U isotopic ratio was investigated in soil samples from three different locations on La Palma (one of the seven Canary Islands, Spain). Additionally the 240Pu/239Pu atomic ratio, as it is a well establish tool for the source identification, was determined. The radiochemical procedure consisted of a U separation step by extraction chromatography using UTEVA® Resin (Eichrom Technologies, Inc.). Afterwards Pu was separated from Th and Np by anion exchange ...

  19. Water dynamics in a laurel montane cloud forest in the Garajonay National Park (Canary Islands, Spain)

    OpenAIRE

    García-Santos, G; Marzol, M. V.; Aschan, G.

    2004-01-01

    Field measurements from February 2003 to January 2004 in a humid (but dry in summer) crest heath wood-land (degraded laurel forest) in the National Park of Garajonay, Canary Islands (Spain), were combined to calculate water balance components. The water balance domain is at the surface of the catchment and is controlled by atmospheric processes and vegetation. This study found that annual water income (rainfall plus fog water) was 1440 mm year-1, half of which was occult (or fog) precipita...

  20. Mouth colour is a reliable signal of need in begging canary nestlings

    OpenAIRE

    R., initials Kilner

    1997-01-01

    Begging passerine chicks display brightly coloured mouths as they solicit food from their parents. Despite a range of hypotheses, the function of vivid nestling mouth colour remains unknown. Here I report that mouth colour functions as a signal of need in canary nestlings, in the days immediately following hatching. Changes in mouth colour accurately reflect a nestling's state of need: the more food deprived the chick, the more intensely coloured its mouth. In controlled experiments with two ...

  1. Contradiction in conservation of island ecosystems: Plants, introduced herbivores and avian scavengers in the Canary Islands

    OpenAIRE

    Gangoso, Laura; Donázar, José A.; Scholz, Sonja; Palacios, César J.; Hiraldo, F.

    2006-01-01

    Introduction of alien herbivores in sensitive island systems has resulted in massive effects on vegetation cover, floristic richness and composition of communities; some species can be even totally extirpated by grazing pressure. Goats Capra hircus and wild rabbits Oryctolagus cuniculus were introduced in the Canary Islands around 500 B.C. Barbary ground squirrels Atlantoxerus getulus were introduced in 1967. Traditional extensive livestock exploitations have been maintained to the present bu...

  2. Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

    OpenAIRE

    Karki, S.; L. Elsgaard; P. E. Lærke

    2014-01-01

    Cultivation of bioenergy crops in rewetted peatland (paludiculture) is considered as a possible land use option to mitigate greenhouse gas (GHG) emissions. However, bioenergy crops like reed canary grass (RCG) can have a complex influence on GHG fluxes. Here we determined the effect of RCG cultivation on GHG emission from peatland rewetted to various extents. Mesocosms were manipulated to three different ground water levels (GWL), i.e., 0,...

  3. Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

    OpenAIRE

    Karki, S.; L. Elsgaard; P. E. Lærke

    2015-01-01

    Cultivation of bioenergy crops in rewetted peatland (paludiculture) is considered as a possible land use option to mitigate greenhouse gas (GHG) emissions. However, bioenergy crops like reed canary grass (RCG) can have a complex influence on GHG fluxes. Here we determined the effect of RCG cultivation on GHG emission from peatland rewetted to various extents. Mesocosms were manipulated to three different ground water levels (GWLs), i.e. 0, −10 and −20 cm below the soil surfa...

  4. Finding of Parastrongylus cantonensis (Chen, 1935) in Rattus rattus in Tenerife, Canary Islands (Spain).

    Science.gov (United States)

    Foronda, Pilar; López-González, Mercedes; Miquel, Jordi; Torres, Jordi; Segovia, Matías; Abreu-Acosta, Néstor; Casanova, Juan Carlos; Valladares, Basilio; Mas-Coma, Santiago; Bargues, María Dolores; Feliu, Carlos

    2010-05-01

    Parastrongylus cantonensis is a parasite of murid rodents that can infect humans and cause health problems as eosinophilic meningitis. Although it is endemic in south Asia, the Pacific islands, Australia, USA, and a few Caribbean islands, it has been extended to new geographical regions. In the Canary Islands (Spain) a survey of helminths of Rattus rattus, Rattus norvegicus and Mus musculus domesticus was carried out. Furthermore, five species of molluscs were examined for nematode larvae to determine whether they are potential intermediate hosts of P. cantonensis. Nematodes were found in the lungs of 15% of 67 R. rattus examined in Tenerife, one of the four studied islands, with a prevalence of 20% in the highest focus of infection. Based on morphological and molecular analysis, with the complete internal transcribed spacer 2 (ITS-2) and a fragment of the small subunit ribosomal RNA (SSU rRNA) nucleotide sequences, nematodes were identified as P. cantonensis. Larval nematodes found from snails and slugs were identified as third-stage (L(3)) Metastrongyloidea, but the molecular study showed that they did not belong to P. cantonensis. This is the first finding of angiostrongyliasis in rats in the Canary Islands (Spain). New molecular data for this species and Parastrongylus dujardini are reported. The presence of P. cantonensis in Tenerife could be of importance from the public health point of view. Further studies are required in order to look for other potential foci of infections in the Canary Islands.

  5. Dilute solution properties of canary seed (Phalaris canariensis) starch in comparison to wheat starch.

    Science.gov (United States)

    Irani, Mahdi; Razavi, Seyed M A; Abdel-Aal, El-Sayed M; Hucl, Pierre; Patterson, Carol Ann

    2016-06-01

    Dilute solution properties of an unknown starch are important to understand its performance and applications in food and non-food industries. In this paper, rheological and molecular properties (intrinsic viscosity, molecular weight, shape factor, voluminosity, conformation and coil overlap parameters) of the starches from two hairless canary seed varieties (CO5041 & CDC Maria) developed for food use were evaluated in the dilute regime (Starch dispersions in DMSO (0.5g/dl)) and compared with wheat starch (WS). The results showed that Higiro model is the best among five applied models for intrinsic viscosity determination of canary seed starch (CSS) and WS on the basis of coefficient of determination (R(2)) and root mean square error (RMSE). WS sample showed higher intrinsic viscosity value (1.670dl/g) in comparison to CSS samples (1.325-1.397dl/g). Berry number and the slope of master curve demonstrated that CSS and WS samples were in dilute domain without entanglement occurrence. The shape factor suggested spherical and ellipsoidal structure for CO5041 starch and ellipsoidal for CDC Maria starch and WS. The molecular weight, coil radius and coil volume of CSSs were smaller than WS. The behavior and molecular characterization of canary seed starch showed its unique properties compared with wheat starch.

  6. First Report of Vermamoeba vermiformis in the Island of El Hierro, Canary Islands, Spain

    Directory of Open Access Journals (Sweden)

    María Reyes-Batlle

    2016-10-01

    Full Text Available Background: Free-living amoebae (FLA are group of protozoa distributed worldwide in many habitats mainly water and soil related sources. Some members of FLA are able to act as opportunistic pathogens and are environmental carriers of other pathogenic agents such as bacteria and viruses. Vermamoeba vermiformis is a highly abundant FLA species in water bodies and has recently gained environmental importance as it acts as a vehicle of many pathogenic bacteria such as Legionella pneumophila.Cases Report: In this study, water samples were collected from the island of El Hierro, Canary Islands, Spain during 2015. El Hierro island was designated by UNESCO as a biosphere reserve and it is currently the less populated of the Canary Islands. The water samples were culture on 2 % Non-Nutrient Agar (NNA plates covered with a thin layer of heat killed E. coli and checked daily for the presence of FLA. After a week, V. vermiformis amoebae were observed in the plates incubated at room temperature and 37 ºC. Molecular characterization was carried out by amplifying the 18S rDNA gene and DNA sequencing, confirming that the isolated strain belonged to Vermamoeba vermiformis species.Conclusion: To the best of our knowledge, this is the first report of Vermamoeba vermiformis isolation in the island of El Hierro and the second report of this species in the Canary Islands.

  7. Long term effects of ash fertilization of reed canary grass; Laangtidseffekter av askgoedsling vid roerflensodling

    Energy Technology Data Exchange (ETDEWEB)

    Palmborg, Cecilia; Lindvall, Eva

    2011-03-15

    Reed canary grass (RCG) is a bio-energy crop with large potential. It is a 1.5 . 2.5 m tall grass that is harvested in spring when it is grown as a fuel. At spring harvest it yields 3 . 10 ton field dried material per ha and year. One disadvantage when reed canary grass is used as a fuel is the high ash content, 5-10 %. This means that large quantities of ash have to be deposited which is expensive, about 1000 SEK/ton. However, since reed canary grass ash contains reasonable amounts of plant nutrients like phosphorous (P), potassium (K) and magnesium (Mg) it could be recycled as fertilizer in agriculture. The ash can be used without any pretreatment since, in agriculture, plant availability is desirable. The aim of this project, was to evaluate a field experiment, where ash was used as a fertilizer in reed canary grass. The experiment was established at the SLU research station in Umea, Sweden in the spring 2002. Three different fertilizer treatments were applied: Treatment A was fertilized with an ash produced by combustion of RCG together with municipal wastes (paper, plastic, leather), treatment B, an ash from combustion of RCG, and for treatment C commercial fertilizers were used. In total, 100 kg ha-1 of nitrogen (N), 15 kg ha-1 of phosphorous (P) and 80 kg ha-1 of potassium (K), were applied each year in all treatments. The amount of ash in treatment A and B was calculated from the chemical analysis of the ashes to be equal to the required amount of P, while K and N were supplied also by commercial fertilizers. [Table 1. Composition of the ashes] Literature study: There is a lack of knowledge about fertilization with reed canary grass ash, since few experiments have been conducted. The composition of reed canary grass is dependent of harvest date and the soil substrate. The amount of ash and the amount of harmful substances such as potassium and chloride generally decreases over winter, giving an increased fuel quality from spring harvest compared to autumn

  8. Nannofossils in 2011 El Hierro eruptive products reinstate plume model for Canary Islands.

    Science.gov (United States)

    Zaczek, Kirsten; Troll, Valentin R; Cachao, Mario; Ferreira, Jorge; Deegan, Frances M; Carracedo, Juan Carlos; Soler, Vicente; Meade, Fiona C; Burchardt, Steffi

    2015-01-01

    The origin and life cycle of ocean islands have been debated since the early days of Geology. In the case of the Canary archipelago, its proximity to the Atlas orogen led to initial fracture-controlled models for island genesis, while later workers cited a Miocene-Quaternary east-west age-progression to support an underlying mantle-plume. The recent discovery of submarine Cretaceous volcanic rocks near the westernmost island of El Hierro now questions this systematic age-progression within the archipelago. If a mantle-plume is indeed responsible for the Canaries, the onshore volcanic age-progression should be complemented by progressively younger pre-island sedimentary strata towards the west, however, direct age constraints for the westernmost pre-island sediments are lacking. Here we report on new age data obtained from calcareous nannofossils in sedimentary xenoliths erupted during the 2011 El Hierro events, which date the sub-island sedimentary rocks to between late Cretaceous and Pliocene in age. This age-range includes substantially younger pre-volcanic sedimentary rocks than the Jurassic to Miocene strata known from the older eastern islands and now reinstate the mantle-plume hypothesis as the most plausible explanation for Canary volcanism. The recently discovered Cretaceous submarine volcanic rocks in the region are, in turn, part of an older, fracture-related tectonic episode. PMID:25609055

  9. Wave-front error breakdown in LGS MOAO validated on-sky by CANARY

    CERN Document Server

    Martin, O A; Rousset, G; Gratadour, D; Vidal, F; Morris, T J; Basden, A G; Myers, R M; Correia, C M; Henry, D

    2016-01-01

    CANARY is the multi-object adaptive optics (MOAO) on-sky pathfinder developed in the perspective of Multi-Object Spectrograph on Extremely Large Telescopes~(ELTs). In 2013, CANARY was operated on-sky at the William Herschel telescope~(WHT), using three off-axis natural guide stars~(NGS) and four off-axis Rayleigh laser guide stars~(LGS), in open-loop, with the on-axis compensated turbulence observed with a H-band imaging camera and a Truth wave-front sensor~(TS) for diagnostic purposes. Our purpose is to establish a reliable and accurate wave-front error breakdown for LGS MOAO. This will enable a comprehensive analysis of \\cana on-sky results and provide tools for validating simulations of MOAO systems for ELTs. To evaluate the MOAO performance, we compared the CANARY on-sky results running in MOAO, in Single Conjugated Adaptive Optics~(SCAO) and in Ground Layer Adaptive Optics~(GLAO) modes, over a large set of data acquired in 2013. We provide a statistical study of the seeing. We also evaluated the wave-fro...

  10. Xenopsylla spp. (Siphonaptera: Pulicidae in murid rodents from the Canary Islands: An update

    Directory of Open Access Journals (Sweden)

    Sánchez S.

    2012-11-01

    Full Text Available The geographical and host distributions of Xenopsylla fleas parasitizing murid rodents on the Canary Islands have been reported. Three Xenopsylla species, X. cheopis, X. brasiliensis and X. guancha, have been detected on two rodents species, Mus musculus and Rattus rattus. X. guancha has been the most prevalent species detected, specifically on M. musculus, the most abundant rodent, but it has been detected only on three eastern islands, where the species is endemic. X. cheopis has been shown to be the most widely distributed species throughout the archipelago and the species most frequently found on R. rattus. X. brasiliensis has been shown to be the least prevalent Xenopsylla species, with the lowest geographical distribution on the Canary Islands and focused only on R. rattus. The detection of both X. cheopis and X. brasiliensis on the island of Lanzarote, and of X. guancha on the island of Fuerteventura and the islet of La Graciosa represents the first report of these species on those particular Canary Islands.

  11. Datos históricos de la presencia de fitónimos relacionados con el género Quercus L. en Canarias

    Directory of Open Access Journals (Sweden)

    Marcos Salas Pascual

    2013-11-01

    Full Text Available En el presente trabajo se discute la posible presencia histórica de algunas especies del género Quercus L. en Canarias. Se utilizan para ello referencias documentales y toponímicas, así como citas botánicas antiguas. De esta manera se plantea la posibilidad de que existiesen poblaciones distintas especies de este género en Fuerteventura y Tenerife.Presently work is discussed the possible historical presence of some species of the gender Quercus L. in Canarias. They are used for this toponimic and documental references, as well as botanical old appointments. This way thinks about the possibility that some species of this gender could grow in Fuerteventura and Tenerife.

  12. Las cerámicas aborígenes de Gran Canaria (Islas Canarias a través del yacimiento de La Cerera: materias primas, tecnología y función

    Directory of Open Access Journals (Sweden)

    del Pino Curbelo, Miguel

    2016-06-01

    Full Text Available This paper focuses on the study of the pre-Hispanic ceramics from the site of La Cerera (Gran Canaria (7th century AD – 13th century AD. An integrated approach combining various levels of analysis has been carried out, employing morphological, technical and functional analysis of the pots, as well as their instrumental characterization: X-ray fluorescence (XRF, X-ray diffraction (XRD, optical petrography and scanning electron microscopy (SEM. As result, different operative chains have been detected, linked to function and chronology. Other differences with respect to the characteristics of the archaeological materials through time were also identified. Those transformations seem to coincide with others already observed for various elements of the aboriginal material culture at the site, as well as at other parts of the island. The effects of the intensification of pottery production on the homogeneity of the fabrics are also discussed.Se analizan los materiales cerámicos prehispánicos del yacimiento de La Cerera en Gran Canaria (siglos VII-XIII D.C.. Se integra la clasificación morfotécnica y funcional, y la caracterización instrumental mediante fluorescencia de rayos X (FRX, difracción de rayos X (DRX, petrografía óptica (PO y microscopía electrónica de barrido (MEB relacionando cada nivel de estudio aplicado. Como resultado se detectaron diferentes cadenas operativas, conectadas con la función de los vasos y su cronología. Además se observaron importantes cambios diacrónicos en las características del material. Estos parecen coincidir con otros identificados en el registro del propio yacimiento y en otros sitios de la isla. También se discuten los posibles efectos de la intensificación de la producción sobre la homogeneidad de las fábricas cerámicas.

  13. Exposición inadvertida a plaguicidas organoclorados (DDT y DDE en la población de las Islas Canarias

    Directory of Open Access Journals (Sweden)

    M. Zumbado

    2004-01-01

    Full Text Available Los plaguicidas organoclorados (OCs son contaminantes universalmente extendidos, detectables en casi todos los sistemas biológicos debido a su alta estabilidad y liposolubilidad. Este estudio determina la presencia del DDT (p,p´-DDT y su principal metabolito el DDE (p,p´-DDE en una muestra representativa de la población del Archipiélago Canario. En éste se ha impuesto en las últimas décadas la agricultura intensiva, utilizando grandes cantidades de pesticidas, entre ellos el DDT (prohibido en España y Europa al final de la década de los 70. Dado que los OCs presentan una alta persistencia en el ambiente y sufren biomagnificación y bioamplificación en la cadena trófica, el estudio cuantitativo de la presencia residuos de estos compuestos en suero humano nos indica la exposición pasada y presente a los mismos. Nuestros resultados demuestran que el conjunto de la población canaria, presenta unos niveles muy superiores a la media europea y que sigue existiendo una exposición a este producto en nuestros días. Resumiendo, según nuestro estudio, el perfil tipo de la persona expuesta a mayores niveles de estos contaminantes en las Islas Canarias es: mujer, mayor de 20 años, residente en Gran Canaria en un área semiurbana o urbana.

  14. The real-time control system for the CANARY multi-object adaptive optics on-sky demonstrator

    Science.gov (United States)

    Dipper, N. A.; Basden, A.; Looker, N. E.; Gendron, E.; Geng, D.; Gratadour, D.; Hubert, Z.; Vidal, F.; Myers, R. M.; Rousset, G.; Sevin, A.; Younger, E. J.

    2010-07-01

    CANARY is a Multi-Object Adaptive Optics (MOAO) system designed to demonstrate the AO aspects of proposed EELT instruments such as the multi-object spectrograph EAGLE. The first phase of Canary will be executed on the 4.2m William Herschel Telescope in 2010. We describe here the AO Real-time Control System (RTCS) for Canary. This is based on a distributed architecture of components interconnected by a fast serial fabric (sFPDP). The hardware used is a hybrid of FPGA and CPU technology. The middleware used for system data telemetry and control is based on CORBA and the publish/subscribe pattern. The system is designed to be easily modified and extended for the later, higher order, phases of CANARY. In order to provide the increase in computational power required in higher order systems, the current CPU technology can be readily replaced by acceleration hardware based on FPGA or GPU technologies. The Canary RTCS thus provides a test-bed for these new technologies that will be required for E-ELT instruments. These design concepts can be developed to provide an RTCS for E-ELT instruments and are in line with those under consideration by ESO for the E-ELT AO systems to which instruments such as EAGLE will be required to interface.

  15. Presencia de rodenticidas anticoagulantes en cinco especies de aves rapaces de las Islas Canarias, 2003-2011

    Directory of Open Access Journals (Sweden)

    N Ruiz-Suárez

    2012-01-01

    Full Text Available Se determinó la presencia de residuos de rodenticidas anticoagulantes por cromatografía de líquidos acoplada a espectrometría de masas de triple cuadrupolo en el hígado de 61 aves rapaces muertas provenientes del Centro de Recuperación de Fauna Silvestre de Tafira (Gran Canaria, pertenecientes a 5 especies de las 11 presentes en el archipiélago canario. Se encontraron residuos en 42 animales (69% si bien en sólo 1 de ellos se consideró la intoxicación por rodenticidas como causa primaria de muerte, según los datos clínicos, analíticos y de necropsia. De las rapaces estudiadas, fueron las especies Tyto alba y Accipiter nisus las que más frecuentemente presentaron residuos de anticoagulantes (85% y 89% respectivamente. Se detectaron residuos de 5 anticoagulantes, todos ellos de segunda generación, siendo la bromadiolona las más frecuentemente detectada, seguida del brodifacoum y del difenacoum. Un elevado número de las muestras positivas (63% presentó más de un residuo de anticoagulantes en su hígado, habiéndose encontrado mezclas de hasta 4 productos diferentes. Llamó la atención que la mayoría de los animales que ingresaron en el centro de recuperación por politraumatismo por colisión presentaba residuos de uno o varios anticoagulantes, así como que rapaces que se alimentan principalmente de pájaros también presentaron frecuentemente residuos de estos compuestos. Los resultados de este estudio sugieren que el elevado uso de rodenticidas anticoagulantes en el medio natural implica su incorporación a la cadena trófica, viéndose afectadas especies de fauna silvestre en las que estos productos podrían producir efectos adversos. Esto implica que la aplicación de rodenticidas anticoagulantes en espacios abiertos supone una amenaza para el estado de conservación de la biodiversidad de las Islas Canarias.

  16. Association between the adherence to the Mediterranean diet and overweight and obesity in pregnant women in Gran Canaria.

    Science.gov (United States)

    Silva-del Valle, Miguel Angel; Sánchez-Villegas, Almudena; Serra-Majem, Lluís

    2013-01-01

    Objetivo: Estimar el grado de adhesión al Patrón de Dieta Mediterránea (DM) en gestantes de Gran Canaria antes del embarazo y en el tercer trimestre valorando su relación con el incremento ponderal y la ganancia adecuada de peso durante el mismo. Sujetos y método: Estudio transversal en 170 gestantes de Gran Canaria. Se estimó la adhesión a DM al inicio del embarazo y en el tercer trimestre mediante un cuestionario frecuencia de consumo validado. El índice de masa corporal (IMC) se determinó al inicio y en el tercer trimestre a partir de los datos de peso y talla de la historia clínica. Se calculó la ganancia adecuada de peso según las recomendaciones establecidas por el Instituto de Medicina Estadounidense. Se estableció la asociación entre la adhesión a DM y sus cambios durante el embarazo y el incremento en el IMC (coeficientes de regresión (b) y sus intervalos de confianza al 95% (IC 95%)) y una ganancia de peso adecuada (Odds Ratios (OR) y sus IC 95%). Resultados: Las mujeres con muy alta adhesión a la DM antes del embarazo ganaron menos peso durante el mismo (b: -1,54; IC 95%: 95% -2,53 a -0,56) que las mujeres con muy baja adhesión al patrón. El incremento en un punto en la adhesión a la DM durante el embarazo se asoció con una mayor probabilidad de ganancia de peso adecuada (OR: 1,39; IC 95%: 1,06 a 1,82). Conclusiones: Una alta adhesión a la DM antes del embarazo podría proteger frente a estados de sobrepeso y obesidad durante el mismo. Un mayor incremento en la adhesión a la DM durante la gestación puede aumentar la probabilidad de una ganancia adecuada de peso en el embarazo.

  17. [TOXIC RISK ASSESSMENT OF FLUORIDE PRESENCE IN BOTTLED WATER CONSUMPTION IN THE CANARY ISLANDS].

    Science.gov (United States)

    Jáudenes Marrero, Juan Ramón; Hardisson de la Torre, Arturo; Gutiérrez Fernández, Angel José; Rubio Armendáriz, Carmen; Revert Gironés, Consuelo

    2015-11-01

    Introducción: el flúor, como hormetina, es necesario en el organismo para evitar las caries, pero en cantidades excesivas puede llevar a efectos tóxicos adversos como la fluorosis dental o la fluorosis invalidante. Así, será importante no sobrepasar de forma crónica las IDR (Ingestas Diarias Recomendadas) para cada rango de edad y sexo. Se asume que la principal fuente de aporte de fluoruros es el agua. Objetivos: establecer las concentraciones de fluoruro en determinadas marcas de agua envasada que se consumen en Canarias, para renovar los datos ya desactualizados, y hacer la correspondiente evaluación del riesgo tóxico. Método: se han utilizado 25 muestras de siete marcas registradas y comercializadas diferentes, siendo analizadas mediante determinación potenciométrica con electrodo ion selectivo de fluoruro. Resultados: todas las marcas de agua analizadas cumplen con los criterios de calidad según la legislación actual española, ninguna puede considerarse “agua fluorada” y todas se pueden usar en la preparación de alimentos infantiles. Además, según las ingestas diarias de agua recomendadas por la EFSA para cada rango de edad, no se supera la IDR para ningún individuo mayor de cuatro años ni para ninguna de las marcas de agua analizadas. Conclusiones: las aguas envasadas producidas en Canarias tienen niveles de fluoruro similares a las producidas en la península (todas en un rango de 0,24 a 0,62 mg/L). Los individuos sobre los que recaen las restricciones más amplias de consumo de agua son los menores de un año, pero en cualquier caso, a medida que el individuo crece va aumentando la permisibilidad del aporte de fluoruros (aumenta hasta los 19 años) y, por tanto, aumenta la variedad de aguas envasadas que se pueden consumir sin superar la IDR. En ciertos lugares de la Comunidad Autónoma Canaria sería recomendable consumir agua envasada respecto al agua de abastecimiento público.

  18. A deep scar in the flank of Tenerife (Canary Islands): Geophysical contribution to tsunami hazard assessment

    Science.gov (United States)

    Coppo, Nicolas P.; Schnegg, Pierre-André; Falco, Pierik; Costa, Roberto

    2009-05-01

    Among the high-intensity on-Earth tsunami generating events, seismicity, submarine landslides, and volcano lateral collapses are the most important [Ward, S.H., 2001. Landslide tsunami. J. Geophy. Res. 106, 11201-11215; Holcomb, R.T., Searle, R.C., 1991. Large landslides from oceanic volcanoes. Mar. Geotech. 10, 19-32; Tinti, S., Bortolucci, E., Romagnoli, C., 2000. Computer simulations of tsunamis due to the sector collapse ar Stromboli, Italy. J. Volcano. Geotherm. Res. 96, 103-128; Ward, S.N., Day, S., 2003. Ritter Island Volcano — lateral collapse and the tsunami of 1888. Geophys. J. Int. 154, 891-902; MacGuire, W.J., 2003. Volcano instability and lateral collapse. Revista 1, 33-45]. Offshore bathymetry studies highlighted huge accumulations of large mass-waste flows (up to thousands cubic kilometres) inherited from past lateral collapses or submarine landslides [ Le Friant, A., Boudon, G., Deplus, C., Villemant, B., 2003. Large-scale flank collapse events during the activity of Montagne Pelée, Martinique, Lesser Antilles. J. Geophys. Res. 108, ECV13; Moore, J.G. et al., 1989. Prodigious submarine Landslides on the Hawaiian ridge. J. Geophys. Res. 94, 17465-17484] which spread over more than 100 km off the northern Tenerife (Canary Islands) coastline [Watts, A.B., Masson, D.G., 1995. A giant landslide on the north flank of Tenerife, Canary Islands. J. Geophys. Res. 100, 24487-24498]. Although mechanics and dynamics triggering such catastrophic events follow from combined complex processes and interactions [Hürlimann, M., Garcia-Piera, J.-O., Ledesma, A., 2000. Causes and mobility of large volcanic landslides: application to Tenerife, Canary Islands. J. Volcano. Geotherm. Res. 103, 121-134; Masson, D.G. et al., 2002. Slope failures on the flanks of the western Canary Islands. Earth-Sci. Rev. 57, 1-35; Reid, M.E., Sisson, T.W., Brien, D.L., 2001. Volcano collapse promoted by hydrothermal alteration and edifice shape, Mount Rainier, Washington. Geology 29, 779

  19. Association between the adherence to the Mediterranean diet and overweight and obesity in pregnant women in Gran Canaria

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Silva-del Valle

    2013-06-01

    Full Text Available Objective: To evaluate the impact of the Mediterranean diet (MD on weight gain and obesity in pregnant women in Gran Canaria. Methods: Cross sectional study in 170 pregnant women We measured the adherence to the MD before and during pregnancy by a food frequency questionnaire. Body mass index (BMI was determined in the first prenatal visit. Appropriate weight gain was calculated according to the recommendations set by the American Institute of Medicine. We established the association between the degree of compliance with the MD and the increase in BMI (regression coefficients [b] and their confidence intervals (CI ([95% CI] and weight gain (Odds ratios [OR] and their 95% CI during pregnancy. Results: Women with a high baseline adherence to the Mediterranean diet gained less weight during pregnancy (b -1.54; CI 95% -2.53 to -0.56 than women with poor adherence. One point increase in the adherence to this diet during pregnancy was associated with an enhanced probability of appropriate weight gain (OR 1.39; CI 95%1.06 to 1.82. Conclusions: A high baseline adherence to the MD may protect against overweight and obesity during pregnancy. Intensifying this habit during gestation can increase the probability of an appropriate weight gain.

  20. Modelos para datos de la economía canaria en los dominios del tiempo y de la frecuencia

    Directory of Open Access Journals (Sweden)

    Gil-Fariña. María Candelaria

    2010-01-01

    Full Text Available La aplicación de algoritmos numéricos relacionados con la aproximación racional de funciones y las transformadas de Fourier y Wavelets han sido objeto de nuestras investigaciones. En este trabajo queremos presentar un breve resumen de los resultados conseguidos a nivel metodológico en su aplicación a la modelización de datos cronológicos. Los ilustramos a través de datos de la economía canaria que tienen que ver con dos sectores destacados de la economía isleña, a saber, el cultivo en declive del plátano que afecta a toda la región y el consumo de agua, siempre bien escaso, en la ciudad de Santa Cruz de Tenerife. En el primer caso, utilizamos modelos en el dominio del tiempo, en particular los modelos de Función de Transferencia en el contexto de la metodología Box-Jenkins, que han sido completados con la inclusión de las expectativas de los inputs. En el segundo caso, debido al interés por conocer los índices de frecuencia relevantes en la serie, hemos utilizado la transformada de wavelets. Así, obtenemos simultáneamente propiedades en el dominio del tiempo y en el dominio de la frecuencia, completando las conclusiones que se obtienen haciendo uso de la transformada de Fourier.

  1. El «Edificio Central» en las Palmas de Gran Canaria – España

    Directory of Open Access Journals (Sweden)

    Ruiz Duerto, A.

    1972-11-01

    Full Text Available A description is given of the program, characteristics, and building solutions for this unique building, situated in downtown Las Palmas. The building complex is composed of two underground levels for parking, a ground-floor and mezzanine for commercial purposes, and open plaza with swimming pool, dressing rooms, cafeteria, restaurant, dance spot, playground, and a block of 15 floors containing 137 apartments of varying size arranged so as to minimize sun overexposure and maximize privacy. The structure is of reinforced concrete and lightweight slabs, and enjoys quality fixtures which assure excellent functioning.Se describe el programa, características y solución constructiva de este edificio singular, situado en el centro cívico de Las Palmas de Gran Canaria. Se compone de: — dos plantas de sótano para estacionamiento de vehículos; planta baja comercial; — entreplanta comercial; — planta libre ajardinada con piscina, vestuarios-aseos, cafetería, restaurante, club de baile, juego de niños, guardería, etc.; — un bloque de 15 plantas con 137 apartamentos, de superficie variada, y dispuesto de forma que evite perjuicios de soleamiento y vistas a los edificios circundantes. Estructura de hormigón armado y losas aligeradas, con toda suerte de instalaciones que aseguren su perfecto funcionamiento.

  2. El papel de los convenios urbanísticos en la planificación de nuevos espacios urbanos: el caso de Gáldar-Guía (Gran Canaria

    Directory of Open Access Journals (Sweden)

    Arranz Lozano, María Mercedes

    2013-06-01

    Full Text Available In the following article we will lay out the urban development guidelines which two municipalities of Gran Canaria have undergone, Gáldar and Guía which, together with Agaete, make up the Northwest sector of the island. The urban expansion took place mainly on the coastal strip of both municipalities, below 300m of altitude above sea level due to the strong demographic increase that took place there at the beginning of the 20th century as a result of agricultural development, particularly in banana and tomato farming; and stemming from the fact that, from the sixties onwards, and more precisely the eighties, property developers realized that the transformation of rural land into urban could be very profitable. This fact caused an urban expansion in the aforementioned strip by means of the legal norm known as the Urban Development Agreement. With this agreement an abstraction was made of the Subsidiary Planning Regulations and furthermore a great connivance between local powers and property developers took place. All with the aim of warranting the private interests of the latter, over the general welfare of the community, in these municipalities.En el artículo que se presenta a continuación damos a conocer las pautas del desarrollo urbano que han experimentado dos municipios de Gran Canaria, Gáldar y Guía, que, con Agaete conforman el sector noroeste de esa isla. La expansión urbana tuvo lugar fundamentalmente en la franja costera de ambos municipios, localizada por debajo de los 300 m de altitud sobre el nivel del mar, porque fue allí donde a comienzos del siglo XX se produjo un fuerte crecimiento demográfico, como resultado del desarrollo agrícola, en particular de los cultivos del plátano y de tomate; y porque a partir de los años sesenta, y más concretamente de los ochenta, los promotores inmobiliarios vieron que la transformación del suelo rural en urbano podía ser muy rentable. Este hecho originó una expansión urbana, en la

  3. The One-humped Camel in the Canary Islands: History and Present Status

    Directory of Open Access Journals (Sweden)

    Wilson, RT.

    2015-01-01

    Full Text Available The one-humped camel (Camelus dromedarius L. is not indigenous to the Canary Islands but based on historical references was introduced at the very beginning of the fifteenth century. The camel thrived in the subtropical dry environment. A long period of isolation from other animals of the same species meant that the animals were virtually disease free. This made the Islands an ideal base for exporting camels to new areas such that camels from the Canaries went to Peru in the sixteenth century, to Brazil in the eighteenth century, Venezuela and Bolivia in the early part of the nineteenth century and Australia in 1840. Camels went to several Caribbean islands in the middle of the nineteenth century. More recently (late twentieth and early twenty-first centuries some animals were exported from the islands to mainland Europe, notably France, Spain and the Netherlands, and to South America. Camels have been used in military operations, as transport and draught animals in support of agriculture and have found a role in the tourist industry. In early 2013 there were some 1,300 camels distributed over four of the larger islands of the archipelago in herds varying in size from a single animal to herds of as many as 150 head: a large group of about 400 heads kept in a Safari Park on the island of Fuerteventura is considered as the national conservation herd. The "Canary" camel has recently been shown to be genetically distinct from most other populations and it has been proposed that it should be designated as a distinct breed.

  4. Comparative analysis of the impact of geological activity on astronomical sites of the Canary Islands, Hawaii and Chile

    CERN Document Server

    Eff-Darwich, A; Rodriguez-Losada, J A; de la Nuez, J; Hernandez-Gutierrez, L E; Romero-Ruiz, M C

    2009-01-01

    An analysis of the impact of seismic and volcanic activity was carried out at selected astronomical sites, namely the observatories of El Teide (Tenerife, Canary Islands), Roque de los Muchachos (La Palma, Canary Islands), Mauna Kea (Hawaii) and Paranal (Chile) and the candidate site of Cerro Ventarrones (Chile). Hazard associated to volcanic activity is low or negligible at all sites, whereas seismic hazard is very high in Chile and Hawaii. The lowest geological hazard in both seismic and volcanic activity was found at Roque de los Muchachos observatory, in the island of La Palma.

  5. Spatial and temporal variations of diffuse CO_{2} degassing at the N-S volcanic rift-zone of Tenerife (Canary Islands, Spain) during 2002-2015 period

    Science.gov (United States)

    Alonso, Mar; Ingman, Dylan; Alexander, Scott; Barrancos, José; Rodríguez, Fátima; Melián, Gladys; Pérez, Nemesio M.

    2016-04-01

    Tenerife is the largest of the Canary Islands and, together with Gran Canaria Island, is the only one with a central volcanic complex that started to grow at about 3.5 Ma. Nowadays the central complex is formed by Las Cañadas caldera, a volcanic depression measuring 16×9 km that resulted from multiple vertical collapses and was partially filled by post-caldera volcanic products. Up to 297 mafic monogenetic cones have been recognized on Tenerife, and they represent the most common eruptive activity occurring on the island during the last 1 Ma (Dóniz et al., 2008). Most of the monogenetic cones are aligned following a triple junction-shaped rift system, as result of inflation produced by the concentration of emission vents and dykes in bands at 120o to one another as a result of minimum stress fracturing of the crust by a mantle upwelling. The main structural characteristic of the southern volcanic rift (N-S) of the island is an apparent absence of a distinct ridge, and a fan shaped distribution of monogenetic cones. Four main volcanic successions in the southern volcanic rift zone of Tenerife, temporally separated by longer periods (˜70 - 250 ka) without volcanic activity, have been identified (Kröchert and Buchner, 2008). Since there are currently no visible gas emissions at the N-S rift, diffuse degassing surveys have become an important geochemical tool for the surveillance of this volcanic system. We report here the last results of diffuse CO2 efflux survey at the N-S rift of Tenerife, performed using the accumulation chamber method in the summer period of 2015. The objectives of the surveys were: (i) to constrain the total CO2 output from the studied area and (ii) to evaluate occasional CO2 efflux surveys as a volcanic surveillance tool for the N-S rift of Tenerife. Soil CO2 efflux values ranged from non-detectable up to 31.7 g m-2 d-1. A spatial distribution map, constructed following the sequential Gaussian simulation (sGs) procedure, did not show an

  6. Pulmonary angiomatosis and hemangioma in common dolphins (Delphinus delphis) stranded in Canary Islands.

    Science.gov (United States)

    Díaz-Delgado, Josué; Arbelo, Manuel; Sacchini, Simona; Quesada-Canales, Óscar; Andrada, Marisa; Rivero, Miguel; Fernández, Antonio

    2012-08-01

    Vascular tumors and disorders, like angiomatosis, are rarely described in cetacean species. A retrospective histological study was carried out on lung samples from 35 common dolphins (Delphinus delphis) stranded in the Canary Islands coasts looking for morphological vascular changes and likely related causes. Twenty-five out of thirty-five (71%) common dolphins showed focal or multifocal angiomatosis-like lesions. A high association between this type of vascular proliferation and parasitic infestation was observed. In addition, a single pulmonary cavernous hemangioma not previously reported in common dolphins is presented.

  7. Wind-forced modeling studies of currents, meanders, eddies, and filaments of the Canary Current System

    OpenAIRE

    Buch, Eric J.

    1997-01-01

    Approved for public release; distribution is unlimited A high-resolution, multi-level, primitive equation ocean model is used to examine the response of an eastern boundary oceanic regime to both wind forcing and irregular coastline geometry. The focus of this study is the coastal region from 300 N to 42.50 N, a portion of the Canary Current System (CCS). To study the generation, evolution, and sustainment of the currents, meanders, eddies and filaments of the CCS, the model is forced from...

  8. Hybrid wind diesel system for a village in the Canary Islands. Operation results and conclusions

    Energy Technology Data Exchange (ETDEWEB)

    Cruz, I.; Arribas, L.; Gonzalez, A. [CIEMAT-IER, Madrid (Spain)] [and others

    1996-12-31

    The first release from the operation data from the Hybrid Wind Diesel System carried-out one year ago in Fuerteventura (Canary Islands) are available. In this paper the results of the detailed analysis are presented, concerning the impact of the parameters from the different systems in the whole system. The performance of the operation strategy is demonstrated with computational results. Comparisons between different function modes are also included. These results show that the feasibility of the project is essentially affected by the wind energy penetration and by the reliability of the system. Finally, system energy balances will be given. (Author)

  9. Bisfosfonatos en atención primaria: Estudio epidemiológico de la administración y repercusión de bisfosfonatos en pacientes que acuden a consultas de odontología del Servicio Canario de Salud Bisphosphonates in primary attention: Study epidemiologist of administration and repercussion of bisphosphonates in patientes who they go to consultations of odontology of the Canary Service of Health

    Directory of Open Access Journals (Sweden)

    S. Bocanegra-Pérez

    2010-06-01

    and July, 2007 to all the 50-year-old patients o more, that they came with appointment before the Consultations of Odontology of three Centers of Health, of the Canary Service of Health in Las Palmas of Gran Canaria. Results: Of 501patients, 25 (5% was in treatment with BF. The risedronato and the alendronato were the most used BF. One found minor frequency of exodoncias with regard to waited in these patients and an increase of the medicinal prescriptions. Conclusions: No patient had come for dental review before initiating a treatment with BF. The patientes in treatment with BF oral route are not properly informed about the possibility of osteonecrosis maxillary after any dental manipulation.

  10. Exercise Tiger: assessing the BCM impact of the 2012 Olympics on Canary Wharf.

    Science.gov (United States)

    Evett, Jonathan

    2011-02-01

    In this paper, collective corporate resilience is studied to see how a culture of sharing information and planning may assist other business communities to prepare for future events. The London 2012 Summer Olympic Games will see huge opportunity for businesses in London, and across Europe, but not without cost. Canary Wharf lies in the heart of London's Docklands and less than three miles from the Olympic Park at Stratford. Purpose-built as a business district, it accommodates a working population of 95,000 people, is home to some of the world's leading brands and has a vibrant retail complex of over 200 shops, bars and restaurants. This business community is preparing for every aspect of the Olympics and, in particular, the disruption the Games will bring. As a private estate, the community resilience approach fostered here is both better defined and finite in terms of those it includes as a result. Preparing together with joint exercises, forums and open communications in a network of trusted partners is yielding collective benefits and lending a stronger voice in the call for more information from official agencies. This paper outlines the benefits of collective planning and reports on the success of Canary Wharf's annual estate-wide business continuity exercise - the first major collective Olympics planning exercise in London.

  11. Analysis of on-sky MOAO performance of CANARY using natural guide stars

    CERN Document Server

    Vidal, Fabrice; Rousset, Gerard; Morris, Tim; Basden, Alastair; Myers, Richard; Brangier, Matthieu; Chemla, Fanny; Dipper, Nigel; Gratadour, Damien; Henry, David; Hubert, Zoltan; Longmore, Andy; Martin, Olivier; Talbot, Gordon; Younger, Eddy

    2014-01-01

    The first on-sky results obtained by CANARY, the Multi-Object Adaptive Optics (MOAO) demonstrator, are analysed. The data were recorded at the William Herschel Telescope, at the end of September 2010. We describe the command and calibrations algorithms used during the run and present the observing conditions. The processed data are MOAO-loop engaged or disengaged slope buffers, comprising the synchronised measurements of the four Natural Guide Stars (NGS) wavefront sensors running in parallel, and near Infra-Red (IR) images. We describe the method we use to establish the error budget of CANARY. We are able to evaluate the to- mographic and the open loop errors, having median values around 216 nm and 110 nm respectively. In addition, we identify an unexpected residual quasi-static field aberration term of mean value 110 nm. We present the detailed error budget analysed for three sets of data for three different asterisms. We compare the experimental budgets with the numerically simulated ones and demonstrate a...

  12. Arrival of radionuclides released by the Fukushima accident to Tenerife (Canary Islands).

    Science.gov (United States)

    López-Pérez, M; Ramos-López, R; Perestelo, Nayra R; Duarte-Rodriguez, X; Bustos, J J; Alonso-Pérez, S; Cuevas, E; Hernández-Armas, J

    2013-02-01

    Two weeks after the accident at the Fukushima-Daichi nuclear power plant, 131I, 137Cs and 134Cs activities were measured in two different stations located in Tenerife (Canary Islands), situated at 300 (FIMERALL) and 2400 (IZAÑA) m.a.s.l, respectively. Peak measured activity concentrations were: 1.851 mBq/m3 (131I); 0.408 mBq/m3 (137Cs) and 0.382 mBq/m3 (134Cs). The activities measured at the FIMERALL station were always higher than at IZAÑA station, suggesting that the radioactive plume arrived to the island associated with low altitude air masses. Simulations of potential dispersion of the radioactive cloud (137Cs) after the nuclear accident in reactor Fukushima I show that radioactive pollution reached remote regions such as the Canary Islands in the Eastern subtropical North Atlantic. The corresponding effective dose to the local population was 1.17 nSv, a value less than one millionth of the annual limit for the general public. Therefore, there was no risk to public health.

  13. Unusual Vermamoeba Vermiformis Strain Isolated from Snow in Mount Teide, Tenerife, Canary Islands, Spain

    Directory of Open Access Journals (Sweden)

    Maria Reyes-Batlle

    2015-10-01

    Full Text Available Background: Free-living amoebae (FLA are protozoa that are widely distributed in the environment mainly in water and soil related habitats. Thermophilic amoebae are among the most common FLA in water bodies, being Vermamoeba vermiformis one of the most common species reported worldwide from these sources. Interestingly, V. vermiformis has often been reported to survive at high temperatures and osmotic pressure worldwide.Materials and Methods: In this study, snow samples were collected from Mount Teide, Tenerife, Canary Islands during the winter season of 2014. The samples were culture on non nutrient agar plates and checked daily for the presence of FLA. After a week, V. vermiformis amoebae were observed in the plates incubated at room temperature and 37ºC.Results: Molecular characterization was carried out by amplifying the 18S rDNA gene and DNA sequencing, confirmed that the isolated strain belonged to Vermamoeba vermiformis species.Conclusion: To the best of our knowledge, this is the first report of Vermamoeba vermiformis isolation from such an inusual habitat (low temperatures and high altitude and the first report of these species in the Canary islands.

  14. Male song quality modulates c-Fos expression in the auditory forebrain of the female canary.

    Science.gov (United States)

    Monbureau, Marie; Barker, Jennifer M; Leboucher, Gérard; Balthazart, Jacques

    2015-08-01

    In canaries, specific phrases of male song (sexy songs, SS) that are difficult to produce are especially attractive for females. Females exposed to SS produce more copulation displays and deposit more testosterone into their eggs than females exposed to non-sexy songs (NS). Increased expression of the immediate early genes c-Fos or zenk (a.k.a. egr-1) has been observed in the auditory forebrain of female songbirds hearing attractive songs. C-Fos immunoreactive (Fos-ir) cell numbers were quantified here in the brain of female canaries that had been collected 30min after they had been exposed for 60min to the playback of SS or NS or control white noise. Fos-ir cell numbers increased in the caudomedial mesopallium (CMM) and caudomedial nidopallium (NCM) of SS birds as compared to controls. Song playback (pooled SS and NS) also tended to increase average Fos-ir cell numbers in the mediobasal hypothalamus (MBH) but this effect did not reach full statistical significance. At the individual level, Fos expression in CMM was correlated with its expression in NCM and in MBH but also with the frequency of calls that females produced in response to the playbacks. These data thus indicate that male songs of different qualities induce a differential metabolic activation of NCM and CMM. The correlation between activation of auditory regions and of the MBH might reflect the link between auditory stimulation and changes in behavior and reproductive physiology. PMID:25846435

  15. Exercise Tiger: assessing the BCM impact of the 2012 Olympics on Canary Wharf.

    Science.gov (United States)

    Evett, Jonathan

    2011-02-01

    In this paper, collective corporate resilience is studied to see how a culture of sharing information and planning may assist other business communities to prepare for future events. The London 2012 Summer Olympic Games will see huge opportunity for businesses in London, and across Europe, but not without cost. Canary Wharf lies in the heart of London's Docklands and less than three miles from the Olympic Park at Stratford. Purpose-built as a business district, it accommodates a working population of 95,000 people, is home to some of the world's leading brands and has a vibrant retail complex of over 200 shops, bars and restaurants. This business community is preparing for every aspect of the Olympics and, in particular, the disruption the Games will bring. As a private estate, the community resilience approach fostered here is both better defined and finite in terms of those it includes as a result. Preparing together with joint exercises, forums and open communications in a network of trusted partners is yielding collective benefits and lending a stronger voice in the call for more information from official agencies. This paper outlines the benefits of collective planning and reports on the success of Canary Wharf's annual estate-wide business continuity exercise - the first major collective Olympics planning exercise in London. PMID:21482513

  16. An examination of amphibian sensitivity to environmental contaminants: are amphibians poor canaries?

    Science.gov (United States)

    Kerby, Jacob L; Richards-Hrdlicka, Kathryn L; Storfer, Andrew; Skelly, David K

    2010-01-01

    Nearly two decades ago, the global biodiversity crisis was catapulted to the front pages of newspapers with the recognition of worldwide amphibian declines. Amphibians earned their appellation, 'canaries in a coal mine', because of apparent high sensitivity to human-mediated environmental change. The most frequently cited causes for high susceptibility include permeable skin, a dual aquatic-terrestrial life cycle and a relatively rudimentary immune system. While some researchers have questioned the basis for the canary assertion, there has been no systematic evaluation of amphibian sensitivity to environmental challenges relative to other taxa. Here, we apply a database representing thousands of toxicity tests to compare the responses of amphibians relative to that of other taxonomic groups. The use of standardized methods combined with large numbers of identical challenges enables a particularly powerful test of relative effect size. Overall, we found that amphibians only exhibit moderate relative responses to water-borne toxins. Our findings imply that, as far as chemical contaminants are concerned, amphibians are not particularly sensitive and might more aptly be described as 'miners in a coal mine'. To the extent that amphibian declines have been mediated by chemical contaminants, our findings suggest that population losses and extinctions may have already occurred in a variety of taxa much more sensitive than amphibians.

  17. Chestnut cultivar diversification process in the Iberian Peninsula, Canary Islands, and Azores.

    Science.gov (United States)

    Pereira-Lorenzo, Santiago; Costa, Rita Maria Lourenço; Ramos-Cabrer, Ana María; Ciordia-Ara, Marta; Ribeiro, Carla Alexandra Marques; Borges, Olga; Barreneche, Teresa

    2011-04-01

    This is a large-scale molecular study based on simple sequence repeat (SSR) loci of the diversification process in chestnut cultivars from Portugal and Spain, from the northern Iberian Peninsula to the Canary Islands and the Azores. A total of 593 grafted chestnut trees (Castanea sativa Mill.) were analysed with 10 SSRs: 292 from Portugal and 301 from Spain. Some of the trees studied were more than 300 years old. Accessions were analysed using a model-based Bayesian procedure to assess the geographical structure and to assign individuals to reconstructed populations based on the SSR genotypes. We found 356 different genotypes with a mean value of clonality of 33% owing to grafting. Mutations accounted for 6%, with hybridization being the main diversification process that can explain the great diversity found. Ten main cultivar groups were detected: four in northern Spain, five in the centre of the Iberian Peninsula, and one in southern Spain related to the centre of the Iberian Peninsula. This work demonstrated that cultivar origin and the diversification process was a combination of clonal propagation of selected seedlings, hybridization, and mutations, which allowed high levels of diversity to be maintained with respect to selected clones for fruit production. Furthermore, seedlings and graft sticks facilitated the transport to new destinations in the colonization process, transporting sometimes more than 3000 km if we consider the Azores and the Canary Islands. PMID:21491973

  18. Mineralization rate of eroded organic C in Andosols of the Canary Islands.

    Science.gov (United States)

    Mora, Juan Luis; Guerra, José Asterio; Armas, Cecilia María; Rodríguez-Rodríguez, Antonio; Arbelo, Carmen Dolores; Notario, Jesús Santiago

    2007-05-25

    The aim of this paper is to determine the biological dynamism of the organic C forms bonded to soil particles mobilized by water erosion in Andosols of the Canary Islands, to evaluate their susceptibility towards mineralization processes and the role of sediments as sources or sinks of atmospheric CO(2) in these soils. The study was carried out in Tenerife (Canary Islands) on three 200 m(2) experimental plots of the RESEL Programme on silic Andosols under forest, 3 years after being subjected to clear-cutting. Eroded sediments were collected for analysis from five significant winter rainfall episodes. For each event, samples of surface (0-5 cm) soil in situ were also collected. CO(2)-C was measured by incubation in all the samples, as well as microbial biomass-linked C. The results obtained show an enrichment in the eroded sediments of microbial biomass (7.5+/-1.6 g kg(-1) vs. 3.8+/-1.5 g kg(-1)) and of potentially mineralizable C (1419 mg CO(2)-C kg(-1) vs. 386 mg CO(2)-C kg(-1)). In addition, there was twice as much mineralization of C compounds in eroded sediments as in the soil surface horizon. PMID:17292946

  19. Pathology and causes of death of stranded cetaceans in the Canary Islands (1999-2005).

    Science.gov (United States)

    Arbelo, Manuel; Los Monteros, Antonio Espinosa de; Herráez, Pedro; Andrada, Marisa; Sierra, Eva; Rodríguez, Francisco; Jepson, Paul D; Fernández, Antonio

    2013-03-26

    Between 1999 and 2005, 233 stranded cetaceans (comprising 19 species) were reported in the waters of the Canary Islands. Of these, 138/233 (59.2%) were subjected to a complete or partial standardized necropsy, including 4 Balaenopteridae, 9 Physeteridae, 8 Kogiidae, 27 Ziphiidae and 90 Delphinidae. Of these, 46/138 (33.3%) cetaceans were diagnosed with anthropogenic pathological categories (i.e. the cause of death was anthropogenic). These included fishing interaction (bycatch) (19 individuals), 'atypical' mass stranding events linked to naval exercises (13), ship collisions (8) and other anthropogenic-related pathology (6). 'Natural' (i.e. non-anthropogenic) causes of death accounted for another 82/138 (59.4%) cases, including infectious and non-infectious diseases (63), neonatal pathology (8), intra- and interspecific interactions (6) and mass strandings (5). The cause(s) of death could not be determined in 10/138 (7.3%) necropsied animals. The most common causes of death were ship collisions in 6/9 (66.6%) Physeteridae, 'atypical' mass stranding linked to naval exercises in 13/27 (48.1%) Ziphiidae, and 'natural' infectious and non-infectious diseases in 55/90 (61.1%) Delphinidae. Interaction with fishing activities was established as cause of death in 15/90 (16.7%) Delphinidae. These data show that a range of anthropogenic and natural single and mass mortality events occur in multiple cetacean species stranded in the Canary Islands. PMID:23548359

  20. PSF reconstruction validated using on-sky CANARY data in MOAO mode

    CERN Document Server

    Martin, O A; Gendron, E; Rousset, G; Gratadour, D; Vidal, F; Morris, T J; Basden, A G; Myers, R M; Neichel, B; Fusco, T

    2016-01-01

    In preparation of future Multi-Object Spectrographs (MOS) whose one of the major role is to provide an extensive statistical studies of high redshifted galaxies surveyed, the demonstrator Canary has been designed to tackle technical challenges related to open-loop Adaptive-Optics (AO) control with jointed Natural Guide Star (NGS) and Laser Guide Star (LGS) tomography. We have developed a Point Spread Function (PSF)-Reconstruction algorithm dedicated to MOAO systems using system telemetry to estimate the PSF potentially anywhere in the observed field, a prerequisite to post- process AO-corrected observations in Integral Field Spectroscopy (IFS). In this paper we show how to handle off-axis data to estimate the PSF using atmospheric tomography and compare it to a classical approach that uses on-axis residual phase from a truth sensor observing a natural bright source. We have reconstructed over 450 on-sky Canary PSFs and we get bias/1-${\\sigma}$ standard-deviation (std) of 1.3/4.8 on the H-band Strehl ratio (SR...

  1. Cocaine use during pregnancy assessed by hair analysis in a Canary Islands cohort

    Directory of Open Access Journals (Sweden)

    Joya Xavier

    2012-01-01

    Full Text Available Abstract Background Drug use during pregnancy is difficult to ascertain, and maternal reports are likely to be inaccurate. The aim of this study was to estimate the prevalence of illicit drug use among pregnant women by using maternal hair analysis. Methods A toxicological analysis of hair was used to detect chronic recreational drug use during pregnancy. In 2007, 347 mother-infant dyads were included from the Hospital La Candelaria, Santa Cruz de Tenerife, Canary Islands (Spain. Data on socioeconomic characteristics and on substance misuse during pregnancy were collected using a structured questionnaire. Drugs of abuse: opiates, cocaine, cannabinoids and amphetamines were detected in maternal hair by immunoassay followed by gas chromatography-mass spectrometry for confirmation and quantitation. Results Hair analysis revealed 2.6% positivity for cocaine and its metabolites. Use of cocaine during pregnancy was associated with unusual behaviour with potentially harmful effects on the baby. Conclusions The results of the study demonstrate significant cocaine use by pregnant women in Canary Islands. The data should be used for the purpose of preventive health and policy strategies aimed to detect and possibly to avoid in the future prenatal exposure to drugs of abuse.

  2. Open-loop tomography with artificial neural networks on CANARY: on-sky results

    CERN Document Server

    Osborn, J; Guzman, D; Basden, A; Morris, T J; Gendron, E; Butterley, T; Myers, R M; Gueslaga, A; Lasheras, F S; Victoria, M G; Rodriguez, M L S; Gratadour, D; Rousset, G

    2014-01-01

    We present recent results from the initial testing of an Artificial Neural Network (ANN) based tomographic reconstructor Complex Atmospheric Reconstructor based on Machine lEarNing (CARMEN) on Canary, an Adaptive Optics demonstrator operated on the 4.2m William Herschel Telescope, La Palma. The reconstructor was compared with contemporaneous data using the Learn and Apply (L&A) tomographic reconstructor. We find that the fully optimised L&A tomographic reconstructor outperforms CARMEN by approximately 5% in Strehl ratio or 15nm rms in wavefront error. We also present results for Canary in Ground Layer Adaptive Optics mode to show that the reconstructors are tomographic. The results are comparable and this small deficit is attributed to limitations in the training data used to build the ANN. Laboratory bench tests show that the ANN can out perform L&A under certain conditions, e.g. if the higher layer of a model two layer atmosphere was to change in altitude by ~300~m (equivalent to a shift of appr...

  3. A Subtropical Cyclone in the Canary Islands: the October 2014 event

    Science.gov (United States)

    Quitian, Lara; Martin, Maria Luisa; Jesús González-Alemán, Juan; Santos-Muñoz, Daniel; Valero Rodríguez, Francisco

    2016-04-01

    Depending on the thermal structure and dynamics, there are different types of cyclones in the troposphere. Subtropical cyclones (STC) are low pressure systems that share tropical and extratropical characteristics, having hybrid thermal structures. In October 2014, a cyclonic system landfall the Canary Islands, causing widespread damages. The system began to develop in October 18 and its effects lasted until October 21. Here, the diagnosis and identification of such cyclone as STC is carried out, examining its dynamical and thermal evolution. Diverse fields have been obtained from three different numerical models, and several diagnostic tools and cyclone phase space diagrams have been used. The cyclone evolved from a typical extratropical cyclone, detached from the atmospheric circulation which was highly meridional and became a stationary cut-off low. The meridional intrusion of the trough as well as a low-level baroclinic zone favored the formation of a STC northwestern of the Canary Islands. Several cyclone phase space diagrams are used to classify the cyclone as a STC, highlighting a deep cold core in its early stages that develops into a shallow warm core. High potential vorticity areas associated with the cyclone promoted strong winds and precipitation over the Islands. Throughout the event, an increased conditional instability is observed in the different soundings, leading to strong vertical wind shear. Moreover, relatively warm sea surface temperature is obtained, establishing the conditions to favor the organization of long-lived convective structures.

  4. Arrival of radionuclides released by the Fukushima accident to Tenerife (Canary Islands)

    International Nuclear Information System (INIS)

    Two weeks after the accident at the Fukushima-Daichi nuclear power plant, 131I, 137Cs and 134Cs activities were measured in two different stations located in Tenerife (Canary Islands), situated at 300 (FIMERALL) and 2400 (IZAÑA) m.a.s.l, respectively. Peak measured activity concentrations were: 1.851 mBq/m3 (131I); 0.408 mBq/m3 (137Cs) and 0.382 mBq/m3 (134Cs). The activities measured at the FIMERALL station were always higher than at IZAÑA station, suggesting that the radioactive plume arrived to the island associated with low altitude air masses. Simulations of potential dispersion of the radioactive cloud (137Cs) after the nuclear accident in reactor Fukushima I show that radioactive pollution reached remote regions such as the Canary Islands in the Eastern subtropical North Atlantic. The corresponding effective dose to the local population was 1.17 nSv, a value less than one millionth of the annual limit for the general public. Therefore, there was no risk to public health. - Highlights: ► Arrival of radionuclides to Tenerife following the accident of Fukushima. ► The atmospheric concentration of radionuclides was always higher at low altitude. ► After reaching the peak concentration a sharp decrease of radionuclides was observed. ► Air mass forward trajectory analysis confirms the potential arrival of radionuclides to Tenerife.

  5. LA INNOVACIÓN EDUCATIVA EN ESPAÑA DESDE LA PERSPECTIVA DE GRUPOS DE DISCUSIÓN: EL CASO DE LA COMUNIDAD AUTÓNOMA DE CANARIAS

    Directory of Open Access Journals (Sweden)

    Juan Santiago Arencibia Arencibia

    2010-01-01

    Full Text Available El artículo se enmarca en una investigación llevada a cabo en todas las comunidades de España sobre las características, impacto y problemática de la innovación educativa iniciada desde los propios centros escolares. En el estudio realizado en la Comunidad Canaria, se utilizaron grupos de discusión con representantes de distintos estamentos relacionados con proyectos de innovación escolar. Los participantes reconocen los esfuerzos de la Administración Canaria por simplificar burocráticamente las convocatorias de proyectos de innovación lo que, a su vez, aumenta las posibilidades de que más centros participen. A pesar de ello, el análisis de nuestros participantes deja claro que la selección de líneas prioritarias en las convocatorias no está suficientemente contrastada con la práctica, los tiempos y recursos asignados no son realistas, y la ausencia de unos procedimientos claros de seguimiento y evaluación convierte a la mayor parte de los proyectos en ceremonias poco sostenibles. Así, la Administración puede decir que desembolsa presupuesto en innovación pero no consigue implicar a la mayor parte de los centros y tampoco tiene respuestas acerca de qué resultados se están obteniendo. Existe pues una burocracia de la innovación pero tal vez todavía no haya todavía una política de innovación educativa en Canarias.

  6. Psammogammarus stocki n. sp. (Crustacea, Amphipoda, Melitidae) from beach interstitia on Tenerife. Stygofauna of the Canary Islands, 21

    NARCIS (Netherlands)

    Vonk, Ronald

    1990-01-01

    A description is given of Psammogammarus stocki n. sp. from the interstitial of loose sediments in heavily exposed rockpools in the mediolittoral zone of Tenerife, Canary Islands. The species apparently represents the ultimate apomorphous condition within the genus and co-occurs with Psammogammarus

  7. Comparison between the landhoppers (Amphipoda: Talitridae) of the genus Orchestia from Tenerife (Canary Islands) and the Azores

    NARCIS (Netherlands)

    Stock, J.H.; Boxshall, G.A.

    1989-01-01

    The terrestial Orchestia from Tenerife (Canary Islands), currently recorded as O. chevreuxi De Guerne, 1887, is compared with material from the terra typica, the island of Faial in the Azores. It is concluded that the Tenerife populations belong to a different species, which we describe as O. guanch

  8. Groundwater and marine intertidal Tubificidae (Oligochaeta) from the Canary and Cabo Verde Islands, with descriptions of two new species

    NARCIS (Netherlands)

    Erséus, Christer

    1992-01-01

    Seven species of Tubificidae are recorded from the Canary Islands, viz. Heterodrilus amplus n. sp., Coralliodrilus leviatriatus Erséus, 1979, Limnodriloides agnes Hrabĕ, 1967, L. janstocki n. sp., Aktedrilus cuneus Erséus, 1984, A. parvithecatus (Erséus, 1978), and Tubifex tubifex (Müller, 1774); th

  9. Window Dressing or Transformation? Intercultural Education Influenced by Globalization and Neoliberalism in a Secondary School in the Canary Islands, Spain

    Science.gov (United States)

    Perez, Lidia Cabrera; Montero-Sieburth, Martha; Gonzalez, Elisa Trujillo

    2012-01-01

    This article profiles intercultural education efforts at schools on the Canary Islands. After a brief profile of this autonomous community of Spain, descriptions of national efforts to promote intercultural education as they are enacted in one particular school setting are provided. Successes and limitations of these efforts are detailed.…

  10. Planck intermediate results XXXVI. Optical identification and redshifts of Planck SZ sources with telescopes at the Canary Islands observatories

    DEFF Research Database (Denmark)

    Ade, P. A. R.; Aghanim, N.; Arnaud, M.;

    2016-01-01

    We present the results of approximately three years of observations of Planck Sunyaev-Zeldovich (SZ) sources with telescopes at the Canary Islands observatories as part of the general optical follow-up programme undertaken by the Planck Collaboration. In total, 78 SZ sources are discussed. Deep-i...

  11. Estudio de la presencia de peligros (aflatoxinas) y fraudes (uso no declarado de cereal transgénico) en el gofio producido en Gran Canaria

    OpenAIRE

    Collado Perera, Miguel Ángel; Millán de Larriva, Rafael; Sanjuán Velázquez, Esther

    2006-01-01

    [ES] Todavía hoy, los cereales son en gran medida el alimento más importante de la humanidad. En las Islas Canarias existe un alimento muy típico elaborado a base de cereales tostados y molidos conocido como gofio, que ya era consumido por los primeros habitantes de las islas. Se considera como un alimento seguro por su baja humedad y por alcanzar temperaturas de 130ºC durante su elaboración. Sin embargo, puede contener sustancias tóxicas conocidas como micotoxinas y, por otro lado, es posibl...

  12. El convenio de Salud Mental en la isla de Gran Canaria y el derecho a la protección de la salud.

    Directory of Open Access Journals (Sweden)

    Antonia J Suárez Suárez

    1996-01-01

    Full Text Available Desde hace más de 20 años, los profesionales de salud mental de la isla de Gran Canaria han apostado y trabajado por una atención en la especialidad de mayor calidad, que pasaba por el aumento de recursos, la creación de nuevos dispositivos y la supresión de ciertas formas de atención al paciente psiquiátrico bastante arcaicas que conculcaban sus derechos fundamentales (el derecho a la dignidad, el derecho a la salud, el derecho a la libertad, y el derecho a la igualdad entre otros.

  13. El hándicap del transporte aéreo para el desarrollo inicial del turismo de masas en las Islas Canarias

    OpenAIRE

    Hernández Luis, José Ángel; Armengol Martín, Matilde; González Morales, Alejandro; Sobral García, Silvia

    2011-01-01

    El transporte aéreo, más aún en un territorio fragmentado y alejado como es el caso del Archipiélago canario, ha jugado un papel trascendental para el desarrollo del turismo de masas en los años sesenta y setenta. En efecto, sin la llegada del motor a reacción a Canarias, no se podría comprender el espectacular desarrollo turístico que las Islas experimentaron en este periodo, siendo el principal objetivo de este trabajo, abordar —aunque de forma sucinta—, este proceso absoluta...

  14. La propaganda radiofónica de la España nacional en Canarias durante la Guerra Civil, 1936–1939

    OpenAIRE

    Yanes Mesa, Julio Antonio

    2011-01-01

    En el presente trabajo nos hemos propuesto arrojar luz sobre uno de los episodios más interesantes, y peor conocidos, de la historia de la radio en España: el uso masivo del medio durante la Guerra Civil en las Islas Canarias, donde el general Franco inició la rebelión contra la II República. A tal fin, pertrechados con datos inéditos recabados en fuentes primarias, tanto archivísticas como hemerográficas, hemos podido desvelar un cúmulo de hechos hasta el momento desconocidos y, al calor de ...

  15. Actitudes ante la diversidad sexual de la población adolescente de Coslada (Madrid) y San Bartolomé de Tirajana (Gran Canaria)

    OpenAIRE

    Martín Martín, Nuria; Molinuevo Puras, Belén; Pichardo Galán, José Ignacio; Rodríguez Medina, Pedro Octavio; Romero López, Marta

    2007-01-01

    La investigación, hecha sobre una muestra de más de 4.500 adolescentes, se ha realizado paralelamente en dos municipios tan diferentes como son Coslada (Madrid) y San Bartolomé de Tirajana (Gran Canaria). En este último se encuentra el famoso destino de turismo gay Maspalomas. La investigación partió de un encargo de la Concejalía de Mujer e Igualdad del Ayuntamiento de Coslada al Área de Educación de la FELGTB (COGAM es fundador y socio de la FELGTB). Posteriormente se incorporó el Ayuntamie...

  16. La aplicación de la música tradicional canaria en las aulas: un reto didáctico para el profesorado

    OpenAIRE

    Delgado, José C.

    2005-01-01

    La música tradicional canaria constituye uno de los fenómenos folklóricos más interesantes en cuanto a su diversidad y calidad, y ocupa un lugar importante dentro del panorama musical del estado, no sólo por el número de cantos y bailes que ha aportado al rico y variado folklore musical español, sino también por la cantidad de investigaciones y datos que de ella se han recogido. Son numerosas las razones que justifican el uso de la música tradicional en las aulas, así como los valores que apo...

  17. La renovación del Hotel Beatriz Atlantis & Spa (Puerto de la Cruz, Islas Canarias): un ejemplo de recualificación de la oferta de alojamiento obsoleta en destinos turísticos consolidados

    OpenAIRE

    Dorta Rodríguez, Agustín; Simancas Cruz, Moisés R.; García Cruz, Juan Israel

    2011-01-01

    Este trabajo se enmarca en el proyecto de I+D+i denominado “ReinvenTUR: Evaluación del impacto de las políticas públicas de renovación de destinos turísticos maduros. El caso de las Directrices de Ordenación del Turismo de Canarias” (SolSubC200801000279) financiado por la Agencia Canaria de Investigación, Innovación y Sociedad de la Información del Gobierno de Canarias y el Fondo Europeo de Desarrollo Regional (FEDER).

  18. The impact of the climate on the epidemiology of Dirofilaria immitis in the pet population of the Canary Islands.

    Science.gov (United States)

    Montoya-Alonso, J A; Carretón, E; Morchón, R; Silveira-Viera, L; Falcón, Y; Simón, F

    2016-01-30

    Cardiopulmonary dirofilariosis (heartworm) is a zoonotic vector borne disease caused by Dirofilaria immitis which affects domestic dogs and cats. Two of the seven Canary Islands are historically hyperendemic areas of dirofilariosis, although no epidemiological study has ever been carried out which includes the other islands. The aim of the study was to complete the epidemiological status of cardiopulmonary dirofilariosis in the canine and feline population throughout all the Canary Islands. 1643 client-owned dogs and 707 client-owned cats were tested for D. immitis antigens (dogs), and anti-D. immitis and anti-Wolbachia antibodies (cats). The prevalence of canine dirofilariosis in the Canary Islands was 15.7%, and the seroprevalence of feline dirofilariosis was 18.1%. A remarkable disparity was found when evaluating the results by island separately, which ranged from from 0% in Lanzarote and El Hierro, low prevalences and seroprevalences in Fuerteventura (1.8% and 2.5% in dogs and cats, respectively), to higher prevalences on the other 4 islands; ranging between 15.7% (dogs) and 14.3% (cats) in La Palma 22.5% (dogs) and 24.1% (cats) in Tenerife. In addition, prevalences and seroprevalences were very variable within each island, these differences being associated to local climate conditions. The distribution and prevalence of dirofilariosis in the Canary Islands is heterogeneous and related to climate, demographic factors and management of pets in the studied areas. Dirofilariosis remains hyperendemic in 4 of the 7 Islands. Since D. immitis is a zoonosis, veterinary and health authorities should be aware of the current prevalence and seroprevalence of animal dirofilariosis. The results show the need for awareness raising campaigns to promote the implementation of prophylactic measures in pets, in order to achieve a decrease in the prevalence of animal dirofilariosis in the Canary Islands. PMID:26801597

  19. Volcanic hazard assessment for the Canary Islands (Spain) using extreme value theory

    Science.gov (United States)

    Sobradelo, R.; Martí, J.; Mendoza-Rosas, A. T.; Gómez, G.

    2011-10-01

    The Canary Islands are an active volcanic region densely populated and visited by several millions of tourists every year. Nearly twenty eruptions have been reported through written chronicles in the last 600 yr, suggesting that the probability of a new eruption in the near future is far from zero. This shows the importance of assessing and monitoring the volcanic hazard of the region in order to reduce and manage its potential volcanic risk, and ultimately contribute to the design of appropriate preparedness plans. Hence, the probabilistic analysis of the volcanic eruption time series for the Canary Islands is an essential step for the assessment of volcanic hazard and risk in the area. Such a series describes complex processes involving different types of eruptions over different time scales. Here we propose a statistical method for calculating the probabilities of future eruptions which is most appropriate given the nature of the documented historical eruptive data. We first characterize the eruptions by their magnitudes, and then carry out a preliminary analysis of the data to establish the requirements for the statistical method. Past studies in eruptive time series used conventional statistics and treated the series as an homogeneous process. In this paper, we will use a method that accounts for the time-dependence of the series and includes rare or extreme events, in the form of few data of large eruptions, since these data require special methods of analysis. Hence, we will use a statistical method from extreme value theory. In particular, we will apply a non-homogeneous Poisson process to the historical eruptive data of the Canary Islands to estimate the probability of having at least one volcanic event of a magnitude greater than one in the upcoming years. This is done in three steps: First, we analyze the historical eruptive series to assess independence and homogeneity of the process. Second, we perform a Weibull analysis of the distribution of repose

  20. Volcanic hazard assessment for the Canary Islands (Spain using extreme value theory

    Directory of Open Access Journals (Sweden)

    R. Sobradelo

    2011-10-01

    Full Text Available The Canary Islands are an active volcanic region densely populated and visited by several millions of tourists every year. Nearly twenty eruptions have been reported through written chronicles in the last 600 yr, suggesting that the probability of a new eruption in the near future is far from zero. This shows the importance of assessing and monitoring the volcanic hazard of the region in order to reduce and manage its potential volcanic risk, and ultimately contribute to the design of appropriate preparedness plans. Hence, the probabilistic analysis of the volcanic eruption time series for the Canary Islands is an essential step for the assessment of volcanic hazard and risk in the area. Such a series describes complex processes involving different types of eruptions over different time scales. Here we propose a statistical method for calculating the probabilities of future eruptions which is most appropriate given the nature of the documented historical eruptive data. We first characterize the eruptions by their magnitudes, and then carry out a preliminary analysis of the data to establish the requirements for the statistical method. Past studies in eruptive time series used conventional statistics and treated the series as an homogeneous process. In this paper, we will use a method that accounts for the time-dependence of the series and includes rare or extreme events, in the form of few data of large eruptions, since these data require special methods of analysis. Hence, we will use a statistical method from extreme value theory. In particular, we will apply a non-homogeneous Poisson process to the historical eruptive data of the Canary Islands to estimate the probability of having at least one volcanic event of a magnitude greater than one in the upcoming years. This is done in three steps: First, we analyze the historical eruptive series to assess independence and homogeneity of the process. Second, we perform a Weibull analysis of the

  1. Cruise report for FS METEOR Cruise 60 Leg 3 from Las Palmas, Canary Islands to Ponta Delgada, Azores, during February 28 - March 14, 1982 (NODC Accession 0078562)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The focus of this cruise leg was physical oceanography of the area between the Canaries and the Azores within the program of the SFB 133 'Warm water sphere of the...

  2. Contribution of bioanthropology to the reconstruction of prehistoric productive processes. The external auditory exostoses in the prehispanic population of Gran Canaria

    Directory of Open Access Journals (Sweden)

    Velasco Vázquez, Javier

    2001-06-01

    Full Text Available The aim of this paper is an approach to the role of bioanthropological studies in the reconstruction of the productive processes of past societies. This objective is obtained starting from the survey and valuation of the prevalence of bone exostoses in the auditory canal among the prehistoric inhabitants of Gran Canaria. The auditory exostose is a bone wound well documented through clinical and experimental studies, closely related to the exposure of the auditory canal to cold water. The estimation of this bone anomaly among the analysed population, leads to the definition of outstanding territorial variations in the economic strategies of these human groups.

    En el presente trabajo se pretende abordar el papel de los estudios bioantropológicos en la reconstrucción de los procesos productivos de las sociedades del pasado. Esta finalidad es perseguida a partir del examen y valoración de la prevalencia de exostosis óseas en el canal auditivo en la población prehistórica de Gran Canaria. Las exostosis auditivas constituyen una lesión ósea, bien documentada en trabajos experimentales y clínicos, estrechamente relacionada con la exposición del canal auditivo al agua fría. La estimación de esta anormalidad ósea en el conjunto poblacional analizado permite la definición de importantes variaciones territoriales en las estrategias económicas emprendidas por estos grupos humanos.

  3. Evaluation of Acanthamoeba isolates from environmental sources in Tenerife, Canary Islands, Spain.

    Science.gov (United States)

    Lorenzo-Morales, Jacob; Monteverde-Miranda, Carlos A; Jiménez, Concepción; Tejedor, María Luisa; Valladares, Basilio; Ortega-Rivas, Antonio

    2005-01-01

    Tests for potentially pathogenic amoebae were carried out in order to determine the presence of free-living amoebae of genus Acanthamoeba in soil and beach sand sources related to human environments in Tenerife, Canary Islands, Spain. Acanthamoeba identification was based on the morphology of cyst and trophozoite forms and PCR amplification with a genus specific primer pair. The pathogenical potential of Acanthamoeba isolates was characterized by temperature and osmotolerance assays and PCR reactions with two primer pairs related to Acanthamoeba pathogenesis. The results demonstrate the presence of potential pathogenic strain in both sources. Thus, some of the amoebae found in these habitats could act as opportunistic pathogens and may present a risk to human health.

  4. Isolation and identification of pathogenic Acanthamoeba strains in Tenerife, Canary Islands, Spain from water sources.

    Science.gov (United States)

    Lorenzo-Morales, Jacob; Ortega-Rivas, Antonio; Foronda, Pilar; Martínez, Enrique; Valladares, Basilio

    2005-03-01

    A comprehensive survey to document the presence of free-living amoebae of the genus Acanthamoeba was conducted in tap water and sea water sources related to human environments in Tenerife, Canary Islands, Spain. Acanthamoeba identification was based on the morphology of cyst and trophozoite forms and PCR amplification with a genus-specific primer pair. The pathogenic potential of Acanthamoeba isolates was characterized by temperature and osmotolerance assays and PCR reactions with two primer pairs related to Acanthamoeba pathogenesis. The results demonstrate the presence of potentially pathogenic strains in both sources. Thus, some of the amoebae in these aquatic habitats can act as opportunistic pathogens, could play a role in the diseases of aquatic organisms, and may present a risk to human health.

  5. Content of free phenolic compounds in cultivars of potatoes harvested in Tenerife (Canary Islands).

    Science.gov (United States)

    Verde Méndez, Candelaria del Mar; Rodríguez Delgado, Miguel Angel; Rodríguez Rodríguez, Elena María; Díaz Romero, Carlos

    2004-03-10

    Determination of free phenolic compounds in potato samples was optimized using a high-performance liquid chromatographic (HPLC) method with on-line diode array detection. This method was applied to samples of four cultivars of potatoes harvested in Tenerife (Canary Islands). The free phenolic compounds found in the potato samples were (+)-catechin, chlorogenic acid, caffeic acid, p-coumaric acid, and ferulic acid. Potato samples belonging to Colorada cultivar, ssp. andigena, had mean concentrations of total phenolic compounds and chlorogenic acid higher than those found for Kerr's Pink and Cara cultivars, ssp. tuberosum, and for Negra cultivar, S. x chaucha. In contrast, p-coumaric acid was not detected in any potato samples of the Colorada cultivar. Traditional potatoes presented a higher mean concentration of ferulic acid than recently imported potatoes. A significant and negative correlation was established between (+)-catechin and p-coumaric acid. A considerable contribution to the daily intake of flavonoids was observed with the actual consumption of potatoes.

  6. L’identité amazighe aux Canaries : l’historiographie des origines1

    OpenAIRE

    Ramos-Martín, Josué

    2014-01-01

    Les habitants des îles Canaries, non loin des côtes africaines, ont toujours eu une place, plus ou moins importante selon les époques, au sein des discours sur l’histoire et l’identité berbère. Peu de recherches ont cependant approfondi les raisons et les modalités de ce lien. Cet article tente d’analyser comment l’historiographie des époques les plus reculées du passé canarien a inclus les Berbères (ou Amazighs) dans ce récit sur les origines. Nous décrirons dans un premier temps la genèse d...

  7. Effect of wildfires on the genetic microbial diversity in forest soils from Canary Islands (Spain

    Directory of Open Access Journals (Sweden)

    J. Rodríguez

    2013-05-01

    Full Text Available Wildfires produce several ecological and environmental impacts on the physical and chemical soil characteristics, as well as on the properties and dynamics of soil microbial populations. Microorganisms are good indicators of ecosystem function and sustainability and therefore the studies about the impact of fire on microbial communities is relevant to understand the role of fire in ecosystem functioning. Although several authors have provided data about total microbial biomass and activity in soils affected by fires, there is little information about the composition and evolution of soil microbial populations after the passage of fire. In this work the effect of wildfires on the genetic diversity of microbial populations in soils from the island of Tenerife (Canary Islands, Spain is studied. The final objective was to get information about the recovery of soil functionality after wildfires.

  8. Canary literature and culture in the reign of Carlos IV (1788-1808

    Directory of Open Access Journals (Sweden)

    Victoria GALVÁN GONZÁLEZ

    2012-02-01

    Full Text Available This work wants to offer a short view of the literature and culture developed in the Canary Isles during the reign period of Charles IV, from a general point of view. Therefore, I cannot offer a detailed perspective of each of the aspects dealt with. This way, what is tackled in this work is a revision of the socio-cultural activities connected to the gatherings or to the economic societies, the educative circumstances, the activity developed by the bishops with the carrying out of facilities or with a reforming teaching at the reading level, such as Tavira, the production of books with an allusion to the printing activity, the most developed literary genres and their authors, the topic preference in poetry —majority genre—, in prose and in theatre, and an allusion to some of the private libraries.

  9. After Timanfaya: overpopulation and soil erosion in the north of Lanzarote (Canary Islands)

    International Nuclear Information System (INIS)

    The eruption of Timanfaya (1730-1736) has been the most important volcanic activity on Canary Islands during historical times (after XV Century). The lave flows and piroclastic layers buried at least 1/4 of Lanzarote surface. Overall the island we can see artificial cross-sections showing ash layers, overlapping paleargids soils or interbedded between alluvial sediment on the bottom of in filled valleys. Sedimentological analysis has been applied on four cross-section located along the island. These data, together with historical information and pottery remains, allow conclude a very recent age for many of this layers, produced by a strong erosion input started by the overgrazing produced by the concentration of livestock during the volcanic crisis. (Author) 6 refs.

  10. Crustal deformation study in the Canary Archipelago by the analysis of GPS observations

    Science.gov (United States)

    Martín, Adriana; Sevilla, Miguel; Zurutuza, Joaquín

    2014-06-01

    The Canary Archipelago is an active volcanic region located in the African plate, at 100 Km of the northwest coast of Africa. The Complutense University of Madrid, Institute of Astronomy and Geodesy (CSIC-UCM) and University of Jaén, established a GPS Network in this region and carried out six observations campaigns from 2002 to 2009. The focus of thiswork is processing and analyzing these observations to study the geodynamic behavior of the stations of this network. The data have been computed with the Bernese GPS Software Version 5.0 obtaining individual solutions of coordinates for each session and campaign, the coordinate velocities of the stations and the time series of baselines formed between them. Results show consistency of station velocities compared to behaviour of areas permanent stations and baselines stability. No deformations could be detected.

  11. The necessity of reconceptualizing the migration of unaccompanied minors to the Canary Islands of Spain

    Directory of Open Access Journals (Sweden)

    Esther Torrado Martín-Palomino

    2015-07-01

    Full Text Available The migration of unaccompanied foreign minors (menores extranjeros no acompañados, MENA represents a new model for international mobility in Spain, one with its own particularities compared with other migratory flows. The dual nature of being unaccompanied and unauthorized leads to conflicts in the care and integration of these new migrants. However, this dual nature is one of the main prerequisites for the development of this mobility model (but not the only one and for developing strategies specific to this group. The Canary Islands, because of their position on the southern intercontinental border and their insularity, offer particular models of individual migration flows of primarily highly vulnerable African children and a close relationship with human smuggling and trafficking networks.

  12. Reproductive pattern of Pterocladiella capillacea (Gelidiales, Rhodophyta) at Canary Islands (Spain, Atlantic Ocean)

    Institute of Scientific and Technical Information of China (English)

    Mascha Stroobant; Milena Polifrone

    2014-01-01

    Objective: To record the reproductive pattern of a natural population of Pterocladiella capillacea from Gáldar (Canary Islands, Spain) from February to August in relation to temperature, irradiance and photoperiod environmental conditions.Methods:Field observation of reproductive thalli was used at different seasons in the year. Results: Tetrasporophytes and vegetative thalli were observed during all the period of study, while female gametophytes bearing cystocarps have been found from May to August in correspondence with the highest water temperature and irradiance values.Conclusions:Our data suggest that the temperature may be the determining factor which regulates the presence of tetrasporophytes in the field. The constant presence of tetrasporophytes could depend on the low excursion range of water temperature (4-5 °C) throughout the period of study, with the highest abundance in February at 20 °C.

  13. Water dynamics in a laurel montane cloud forest in the Garajonay National Park (Canary Islands, Spain

    Directory of Open Access Journals (Sweden)

    G. García-Santos

    2004-01-01

    Full Text Available Field measurements from February 2003 to January 2004 in a humid (but dry in summer crest heath wood-land (degraded laurel forest in the National Park of Garajonay, Canary Islands (Spain, were combined to calculate water balance components. The water balance domain is at the surface of the catchment and is controlled by atmospheric processes and vegetation. This study found that annual water income (rainfall plus fog water was 1440 mm year-1, half of which was occult (or fog precipitation, while stand transpiration estimated from measurements of sap flow amounted, annually, to 40% of potential evapotranspiration calculated from measurements of meteorological variables. The positive role of crest laurel forests, which transpire less water than is incoming from rain and fog is emphasised. Keywords: laurel forest, fog interception, stand transpiration, sap flow, hydrological cycle

  14. Comparison of biogas production from wild and cultivated varieties of reed canary grass.

    Science.gov (United States)

    Oleszek, Marta; Król, Aleksandra; Tys, Jerzy; Matyka, Mariusz; Kulik, Mariusz

    2014-03-01

    The chemical composition and efficiency of biogas production in the methane fermentation process of silages of wild and cultivated varieties of reed canary grass were compared. An attempt was made to answer the question on how the habitat and the way of utilization of plants affect chemical composition and biogas yield. Physicochemical properties such as dry matter, organic dry matter, protein, fat, crude fiber fraction, macro- and microelements content were considered. The anaerobic digestion process and FTIR analysis were also carried out. The results showed that the two varieties differ essentially in their physical and chemical properties. The cultivated variety was characterized by higher biogas yield (406Ndm(3)kg(-1) VS) than the wild one (120Ndm(3)kg(-1) VS). This was probably related to the chemical composition of plants, especially the high content of indigestible crude fiber fractions and ash. These components could reduce biogas quantity and quality. PMID:24518439

  15. Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

    DEFF Research Database (Denmark)

    Karki, Sandhya; Elsgaard, Lars; Lærke, Poul Erik

    2015-01-01

    Cultivation of bioenergy crops in rewetted peatland (paludiculture) is considered as a possible land use option to mitigate greenhouse gas (GHG) emissions. However, bioenergy crops like reed canary grass (RCG) can have a complex influence on GHG fluxes. Here we determined the effect of RCG...... cultivation on GHG emission from peatland rewetted to various extents. Mesocosms were manipulated to three different ground water levels (GWLs), i.e. 0, −10 and −20 cm below the soil surface in a controlled semi-field facility. Emissions of CO2 (ecosystem respiration, ER), CH4 and N2O from mesocosms with RCG....... However, this difference was due to decreased soil respiration at the rising GWL as the plant-derived CO2 flux was similar at all three GWLs. For methane, 70–95% of the total emission was due to presence of RCG, with the highest contribution at −20 cm GWL. In contrast, cultivation of RCG decreased N2O...

  16. Comparison of biogas production from wild and cultivated varieties of reed canary grass.

    Science.gov (United States)

    Oleszek, Marta; Król, Aleksandra; Tys, Jerzy; Matyka, Mariusz; Kulik, Mariusz

    2014-03-01

    The chemical composition and efficiency of biogas production in the methane fermentation process of silages of wild and cultivated varieties of reed canary grass were compared. An attempt was made to answer the question on how the habitat and the way of utilization of plants affect chemical composition and biogas yield. Physicochemical properties such as dry matter, organic dry matter, protein, fat, crude fiber fraction, macro- and microelements content were considered. The anaerobic digestion process and FTIR analysis were also carried out. The results showed that the two varieties differ essentially in their physical and chemical properties. The cultivated variety was characterized by higher biogas yield (406Ndm(3)kg(-1) VS) than the wild one (120Ndm(3)kg(-1) VS). This was probably related to the chemical composition of plants, especially the high content of indigestible crude fiber fractions and ash. These components could reduce biogas quantity and quality.

  17. Seabird diversity hotspot linked to ocean productivity in the Canary Current Large Marine Ecosystem.

    Science.gov (United States)

    Grecian, W James; Witt, Matthew J; Attrill, Martin J; Bearhop, Stuart; Becker, Peter H; Egevang, Carsten; Furness, Robert W; Godley, Brendan J; González-Solís, Jacob; Grémillet, David; Kopp, Matthias; Lescroël, Amélie; Matthiopoulos, Jason; Patrick, Samantha C; Peter, Hans-Ulrich; Phillips, Richard A; Stenhouse, Iain J; Votier, Stephen C

    2016-08-01

    Upwelling regions are highly productive habitats targeted by wide-ranging marine predators and industrial fisheries. In this study, we track the migratory movements of eight seabird species from across the Atlantic; quantify overlap with the Canary Current Large Marine Ecosystem (CCLME) and determine the habitat characteristics that drive this association. Our results indicate the CCLME is a biodiversity hotspot for migratory seabirds; all tracked species and more than 70% of individuals used this upwelling region. Relative species richness peaked in areas where sea surface temperature averaged between 15 and 20°C, and correlated positively with chlorophyll a, revealing the optimum conditions driving bottom-up trophic effects for seabirds. Marine vertebrates are not confined by international boundaries, making conservation challenging. However, by linking diversity to ocean productivity, our research reveals the significance of the CCLME for seabird populations from across the Atlantic, making it a priority for conservation action. PMID:27531154

  18. Composition of air masses in Fuerteventura (Canary Islands) according to their origins

    Energy Technology Data Exchange (ETDEWEB)

    Patier, R.F.; Diez Hernandez, P.; Diaz Ramiro, E.; Ballesteros, J.S.; Santos-Alves, S.G. dos [Centro Nacional de Sanidad Ambiental, Madrid (Spain). Inst. de Salud Carlos III

    1994-12-31

    The Centro Nacional de Sanidad Ambiental has among their duties the background atmospheric pollution monitoring in Spain. To do so, the laboratory has set up 6 field stations in the Iberian Peninsula. In these stations, both gaseous and particulate pollutants are currently analyzed. However, there is a lack of data about the atmospheric pollution in the Canary, where they are a very strong influence of natural emissions from sea and the Saharan desert, mixed with anthropogenic ones. Therefore, during the ASTEX/MAGE project the CNSA established a station in Fuerteventura island, characterized by the nonexistence of man-made emissions, to measure some atmospheric pollutants, in order to foresee their origins. In this study, the authors analyzed some pollutants that are used to obtain a clue about the sources of air masses such as gaseous ozone and metallic compounds (vanadium, iron and manganese) in the atmospheric aerosol fractionated by size.

  19. Seabird diversity hotspot linked to ocean productivity in the Canary Current Large Marine Ecosystem

    Science.gov (United States)

    Attrill, Martin J.; Becker, Peter H.; Egevang, Carsten; Furness, Robert W.; Grémillet, David; Kopp, Matthias; Lescroël, Amélie; Matthiopoulos, Jason; Peter, Hans-Ulrich; Phillips, Richard A.

    2016-01-01

    Upwelling regions are highly productive habitats targeted by wide-ranging marine predators and industrial fisheries. In this study, we track the migratory movements of eight seabird species from across the Atlantic; quantify overlap with the Canary Current Large Marine Ecosystem (CCLME) and determine the habitat characteristics that drive this association. Our results indicate the CCLME is a biodiversity hotspot for migratory seabirds; all tracked species and more than 70% of individuals used this upwelling region. Relative species richness peaked in areas where sea surface temperature averaged between 15 and 20°C, and correlated positively with chlorophyll a, revealing the optimum conditions driving bottom-up trophic effects for seabirds. Marine vertebrates are not confined by international boundaries, making conservation challenging. However, by linking diversity to ocean productivity, our research reveals the significance of the CCLME for seabird populations from across the Atlantic, making it a priority for conservation action. PMID:27531154

  20. Effect of Additives and Fuel Blending on Emissions and Ash-Related Problems from Small-Scale Combustion of Reed Canary Grass

    OpenAIRE

    Sébastien Fournel; Joahnn H. Palacios; Stéphane Godbout; Michèle Heitz

    2015-01-01

    Agricultural producers are interested in using biomass available on farms to substitute fossil fuels for heat production. However, energy crops like reed canary grass contain high nitrogen (N), sulfur (S), potassium (K) and other ash-forming elements which lead to increased emissions of gases and particulate matter (PM) and ash-related operational problems (e.g., melting) during combustion. To address these problematic behaviors, reed canary grass was blended with wood (50 wt%) and fuel addit...

  1. Multivariate Modelling of the Canary Islands Banana Output. The Role of Farmer Income Expectation

    Directory of Open Access Journals (Sweden)

    Concepción González-Concepción

    2008-01-01

    Full Text Available The EU is the world’s largest importer of bananas and the only major managed market in the international banana trade. Spain is the main banana producer within the European Union (EU, followed by France and Portugal. In all these countries the fruit is grown in overseas islands situated in tropical or sub-tropical areas and bananas are a pillar of the economic, social and environmental balance of these regions. Spanish production comes from the Canary Islands, an insular environment located in the Atlantic Ocean more than 1000 km south of the Iberian Peninsula and near the northwest coast of Africa. In the context of high production costs and strong competition from Latin American imports, the compensatory aid that local farmers have been receiving from the EU since 1993 has helped the archipelago to maintain its agricultural position while constituting a main support from an economic, social and landscaping standpoint. This research analyses the Canary Islands banana output evolution through the use of certain multivariate dynamic models that consider the influence of past production costs, past farmer income and future expectations, including a sensitivity analysis. We consider annual data time series on production, perceived prices and production costs for the period 1938-2002. Model predictions are contrasted using data for the period 2003-2006, thus spanning a wide period of time that includes key points such as the 1993 reform and the introduction of the 2006 reform. The empirical work highlights, as do all EU norms, the importance of maintaining adequate farmer income expectations to assure subsistence banana production.

  2. Reed canary grass yield and fuel quality in Estonian farmers' fields

    Energy Technology Data Exchange (ETDEWEB)

    Heinsoo, Katrin; Hein, Katre; Melts, Indrek; Holm, Bert [Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Riia 181, 51014 Tartu (Estonia); Ivask, Mari [Tartu College, Tallinn University of Technology, Puiestee 78, 51008 Tartu (Estonia)

    2011-01-15

    Reed canary grass (Phalaris arundinacea) is one of the possible raw materials for bioenergy production in northern Europe. Its cultivation is favoured because its high productivity and local origin. However, problems with the biomass quality for combustion have been reported. Usually delayed harvest in spring is suggested to improve the quality and decrease the moisture content of biomass. On the other hand, the feasibility of spring harvest depends on local climatic conditions and may cause yield losses. In current paper we studied reed canary grass fields in Estonia locating on different soil types and cultivated with various varieties. The influence of several fertilisation schemes on biomass yield was analysed. Our results indicated that production was higher on mineral soils than on the organic soil of abandoned peat extraction sites. Even different types of fertilisation did not increase the production on organic soils to the level comparable to those on mineral soils. Among studied varieties 'Venture' had the highest production. The highest yield per area was obtained late in the autumn (12.7 t d.w. per ha and 7.2 t d.w. per ha on mineral and organic soils, respectively). By spring the amount of biomass had decreased in all studied sites. Due to wet soil some of the fields remained unharvested, the others had high yield losses during practical harvesting. The chemical analyses did not reveal significant differences in the composition of biomass between late autumn and spring. Therefore we conclude that late autumn harvest should be preferred in local climatic conditions. (author)

  3. Floating sandstones off El Hierro (Canary Islands, Spain: the peculiar case of the October 2011 eruption

    Directory of Open Access Journals (Sweden)

    V. R. Troll

    2011-12-01

    Full Text Available The eruption that started off the south coast of El Hierro, Canary Islands, in October 2011 has emitted intriguing eruption products found floating in the sea. These specimens appeared as floating volcanic "bombs" that have in the meantime been termed "restingolites" (after the close-by village of La Restinga and exhibit cores of white and porous pumice-like material. Currently the nature and origin of these "floating stones" is vigorously debated among researchers, with important implications for the interpretation of the hazard potential of the ongoing eruption. The "restingolites" have been proposed to be either (i juvenile high-silica magma (e.g. rhyolite, (ii remelted magmatic material (trachyte, (iii altered volcanic rock, or (iv reheated hyaloclastites or zeolite from the submarine slopes of El Hierro. Here, we provide evidence that supports yet a different conclusion. We have collected and analysed the structure and composition of samples and compared the results to previous work on similar rocks found in the archipelago. Based on their high silica content, the lack of igneous trace element signatures, and the presence of remnant quartz crystals, jasper fragments and carbonate relicts, we conclude that "restingolites" are in fact xenoliths from pre-island sedimentary rocks that were picked up and heated by the ascending magma causing them to partially melt and vesiculate. They hence represent messengers from depth that help us to understand the interaction between ascending magma and crustal lithologies in the Canary Islands as well as in similar Atlantic islands that rest on sediment/covered ocean crust (e.g. Cape Verdes, Azores. The occurrence of these "restingolites" does therefore not indicate the presence of an explosive high-silica magma that is involved in the ongoing eruption.

  4. The use of reed canary grass and giant miscanthus in the phytoremediation of municipal sewage sludge.

    Science.gov (United States)

    Antonkiewicz, Jacek; Kołodziej, Barbara; Bielińska, Elżbieta Jolanta

    2016-05-01

    The application of municipal sewage sludge on energy crops is an alternative form of recycling nutrients, food materials, and organic matter from waste. Municipal sewage sludge constitutes a potential source of heavy metals in soil, which can be partially removed by the cultivation of energy crops. The aim of the research was to assess the effect of municipal sewage sludge on the uptake of heavy metals by monocotyledonous energy crops. Sewage sludge was applied at doses of 0, 10, 20, 40, and 60 Mg DM · ha(-1) once, before the sowing of plants. In a 6-year field experiment, the effect of four levels of fertilisation with sewage sludge on the uptake of heavy metals by two species of energy crops, reed canary grass (Phalaris arundinacea L.) of 'Bamse' cultivar and giant miscanthus (Miscanthus × giganteus GREEF et DEU), was analysed. It was established that the increasing doses of sewage sludge had a considerable effect on the increase in biomass yield from the tested plants. Due to the increasing doses of sewage sludge, a significant increase in heavy metals content in the energy crops was recorded. The heavy metal uptake with the miscanthus yield was the highest at a dose of 20 Mg DM · ha(-1), and at a dose of 40 Mg DM · ha(-1) in the case of reed canary grass. Research results indicate that on account of higher yields, higher bioaccumulation, and higher heavy metal uptake, miscanthus can be selected for the remediation of sewage sludge. PMID:26841773

  5. Vertical distribution, composition and migratory patterns of acoustic scattering layers in the Canary Islands

    Science.gov (United States)

    Ariza, A.; Landeira, J. M.; Escánez, A.; Wienerroither, R.; Aguilar de Soto, N.; Røstad, A.; Kaartvedt, S.; Hernández-León, S.

    2016-05-01

    Diel vertical migration (DVM) facilitates biogeochemical exchanges between shallow waters and the deep ocean. An effective way of monitoring the migrant biota is by acoustic observations although the interpretation of the scattering layers poses challenges. Here we combine results from acoustic observations at 18 and 38 kHz with limited net sampling in order to unveil the origin of acoustic phenomena around the Canary Islands, subtropical northeast Atlantic Ocean. Trawling data revealed a high diversity of fishes, decapods and cephalopods (152 species), although few dominant species likely were responsible for most of the sound scattering in the region. We identified four different acoustic scattering layers in the mesopelagic realm: (1) at 400-500 m depth, a swimbladder resonance phenomenon at 18 kHz produced by gas-bearing migrant fish such as Vinciguerria spp. and Lobianchia dofleini, (2) at 500-600 m depth, a dense 38 kHz layer resulting primarily from the gas-bearing and non-migrant fish Cyclothone braueri, and to a lesser extent, from fluid-like migrant fauna also inhabiting these depths, (3) between 600 and 800 m depth, a weak signal at both 18 and 38 kHz ascribed either to migrant fish or decapods, and (4) below 800 m depth, a weak non-migrant layer at 18 kHz which was not sampled. All the dielly migrating layers reached the epipelagic zone at night, with the shorter-range migrations moving at 4.6 ± 2.6 cm s - 1 and the long-range ones at 11.5 ± 3.8 cm s - 1. This work reduces uncertainties interpreting standard frequencies in mesopelagic studies, while enhances the potential of acoustics for future research and monitoring of the deep pelagic fauna in the Canary Islands.

  6. Vertical distribution, composition and migratory patterns of acoustic scattering layers in the Canary Islands

    KAUST Repository

    Ariza, A.

    2016-01-21

    Diel vertical migration (DVM) facilitates biogeochemical exchanges between shallow waters and the deep ocean. An effective way of monitoring the migrant biota is by acoustic observations although the interpretation of the scattering layers poses challenges. Here we combine results from acoustic observations at 18 and 38 kHz with limited net sampling in order to unveil the origin of acoustic phenomena around the Canary Islands, subtropical northeast Atlantic Ocean. Trawling data revealed a high diversity of fishes, decapods and cephalopods (152 species), although few dominant species likely were responsible for most of the sound scattering in the region. We identified four different acoustic scattering layers in the mesopelagic realm: (1) at 400–500 m depth, a swimbladder resonance phenomenon at 18 kHz produced by gas-bearing migrant fish such as Vinciguerria spp. and Lobianchia dofleini, (2) at 500–600 m depth, a dense 38 kHz layer resulting primarily from the gas-bearing and non-migrant fish Cyclothone braueri, and to a lesser extent, from fluid-like migrant fauna also inhabiting these depths, (3) between 600 and 800 m depth, a weak signal at both 18 and 38 kHz ascribed either to migrant fish or decapods, and (4) below 800 m depth, a weak non-migrant layer at 18 kHz which was not sampled. All the dielly migrating layers reached the epipelagic zone at night, with the shorter-range migrations moving at 4.6 ± 2.6 cm s − 1 and the long-range ones at 11.5 ± 3.8 cm s − 1. This work reduces uncertainties interpreting standard frequencies in mesopelagic studies, while enhances the potential of acoustics for future research and monitoring of the deep pelagic fauna in the Canary Islands.

  7. Contaminantes orgánicos persistentes en plasma de tortugas bobas (Caretta caretta varadas en las Islas Canarias

    Directory of Open Access Journals (Sweden)

    M Camacho

    2012-01-01

    Full Text Available En el presente estudio se ha evaluado el grado de contaminación por contaminantes orgánicos persistentes (COPs en 193 ejemplares de tortuga boba (Caretta caretta varadas en las Islas Canarias entre 2007-2011. La cuantificación en plasma de los niveles de pesticidas organoclorados (POCs, bifenilos policlorados (PCBs e hidrocarburos aromáticos policíclicos (PAHs se realizó mediante GC-MS. Todas las muestras analizadas presentaron niveles cuantificables de alguno de los COPs incluidos en el estudio. El grupo de COPs que presentó mayores niveles fue el de los PAHs (alcanzando la carga total de PAHs 6,45 ng/ml, siendo el fenantreno el hidrocarburo más frecuentemente detectado y a concentraciones más altas, lo que indica el origen petrogénico de estos contaminantes. La contaminación por PCBs alcanzó niveles menores (3,84 ng/ml, predominando el grupo de los hexaclorobifenilos (PCB-153 y PCB- 138 principalmente. Los niveles de contaminación por POCs fueron también bajos alcanzando valores de 1,67 ng/ml, siendo el principal metabolito del DDT, el p,p´-DDE el compuesto más frecuentemente detectado (89,6% y a más altas concentraciones (0,68 ng/ml. Fue evidente una asociación inversa entre el tamaño de las tortugas y la carga de PCBs y PAHs. Asimismo existieron niveles más altos de contaminación por COPs en los años 2009 y 2010. Este trabajo evalúa por vez primera la presencia de PAHs en sangre de tortugas varadas y nuestros resultados parecen indicar que esta metodología y esta especie animal pueden ser muy útiles para monitorizar la presencia de contaminación por derivados del petróleo en el medio acuático.

  8. Presentación de la cohorte "CDC de Canarias": objetivos, diseño y resultados preliminares

    Directory of Open Access Journals (Sweden)

    Antonio Cabrera de León

    2008-01-01

    Métodos: Estudio prospectivo con muestreo aleatorio en población general, en el que participaron 6.729 personas entre los años 2000 y 2005 (edad 18-75 años. Se les realizó antropometría y se extrajo sangre para almacenamiento de muestras séricas y genéticas. Mediante cuestionario se recogió: hábitos dietéticos, actividad física, antecedentes personales y familiares de enfermedad, exposición a FR laborales o ambientales, tabaquismo, etc. Resultados: La prevalencia de obesidad es casi del 30%, sin diferencias entre sexos, pero el sobrepeso afecta más a los varones (45 vs. 33%; p<0'001, los cuales presentan también mayor prevalencia de diabetes (12 vs. 10%; p =0'005, hipertensión (43 vs. 33%; p<0'001, ingesta excesiva de alcohol (13 vs. 2%; p<0'001 y falta de protección solar (46 vs. 18%; p<0'001. En las mujeres es más frecuente la exposición a bajos niveles de colesterol HDL (37 vs. 30%; p<0'001 y al sedentarismo (71 vs. 55%; p<0'001. La exposición a los FR estudiados, entre ellos la pobreza, es mayor en edades avanzadas, salvo el tabaquismo (26% que es mayor en edades jóvenes. La estimación de riesgos relativos de exposición a los factores de riesgo cardiovascular y de cáncer es más alta en las clases sociales pobres. Conclusiones: La actual población adulta de Canarias presenta una elevada prevalencia de exposición a factores de riesgo para las enfermedades cardiovasculares, la diabetes y el cáncer, destacando especialmente el sobrepeso, la obesidad y el sedentarismo.

  9. Gastro-enteritis outbreak among Nordic patients with psoriasis in a health centre in Gran Canaria, Spain: a cohort study

    Directory of Open Access Journals (Sweden)

    Rose Angela MC

    2004-10-01

    Full Text Available Abstract Background Between November 2 and 10, 2002 several patients with psoriasis and personnel staying in the health centre in Gran Canaria, Spain fell ill with diarrhoea, vomiting or both. Patient original came from Norway, Sweden and Finland. The patient group was scheduled to stay until 8 November. A new group of patients were due to arrive from 7 November. Methods A retrospective cohort study was conducted to assess the extent of the outbreak, to identify the source and mode of transmission and to prevent similar problems in the following group. Results Altogether 41% (48/116 of persons staying at the centre fell ill. Norovirus infection was suspected based on clinical presentations and the fact that no bacteria were identified. Kaplan criteria were met. Five persons in this outbreak were hospitalised and the mean duration of diarrhoea was 3 days. The consequences of the illness were more severe compared to many other norovirus outbreaks, possibly because many of the cases suffered from chronic diseases and were treated with drugs reported to affect the immunity (methotrexate or steroids. During the two first days of the outbreak, the attack rate was higher in residents who had consumed dried fruit (adjusted RR = 3.1; 95% CI: 1.4–7.1 and strawberry jam (adjusted RR = 1.9; 95% CI: 0.9–4.1 than those who did not. In the following days, no association was found. The investigation suggests two modes of transmission: a common source for those who fell ill during the two first days of the outbreak and thereafter mainly person to person transmission. This is supported by a lower risk associated with the two food items at the end of the outbreak. Conclusions We believe that the food items were contaminated by foodhandlers who reported sick before the outbreak started. Control measures were successfully implemented; food buffets were banned, strict hygiene measures were implemented and sick personnel stayed at home >48 hours after last

  10. Origin and palaeo-environmental significance of the Berrazales carbonate spring deposit, North of Gran Canaria Island, Spain

    Science.gov (United States)

    Camuera, Jon; Alonso-Zarza, Ana M.; Rodríguez-Berriguete, Álvaro; Rodriguez-Gonzalez, Alejandro

    2014-07-01

    The Berrazales carbonate spring deposit is a small outcrop constituted mainly by cascade-like geometries. Four main facies have been identified: fibrous dense macrocrystalline formed by rapid degassing under high-flow conditions; framestones of coated plant moulds formed in moderate energy flow favoured by the presence of biogenic support; micrite/microsparite are primary precipitates in which crystalline aggregates nucleated on organic filaments and/or EPS; banded micrite-coarse crystalline were the result of alternating physically, chemically and biologically induced precipitation in areas of varying flow-velocities. Most facies underwent different degrees of micritization processes. Micrite is distributed as thin lines penetrating the crystals, as irregular patches or as micrite layers. In the first case organic filaments penetrate crystals, suggesting that micritization is mainly biogenically driven. In the latter cases micritization is caused mostly by partial dissolution. Microbe participation in micrite formation increased micrite MgCO3 content in comparison with coarse crystalline facies. Isotopic analyses show positive δ13C values (+ 2.63 and + 4.29‰ VPDB) and negative δ18O (- 5.65 and - 4.48‰ VPDB) values. Positive δ13C values clearly indicate "deep-sourced" fluids. The Berrazales spring deposit studied here very probably is a small part of a larger carbonate building that was largely eroded by fluvial incision. Calculations of spring water temperature give a range from 20 °C to 35 °C, characteristic of a cold to warm spring favouring precipitation of calcite and important biogenic activity (framestones). Although the study deposit has textural characteristics of tufas, proving that the CO2 sourced from deep fluids, it should be considered as thermogene travertine, being one more example of the difficulty of using those terms for ancient sedimentary deposits. Carbonate spring deposits, very rare in the Canary Islands, are good archives of recent

  11. 3D coupled geophysical‐petrological modelling of the Canary Islands and north-western African margin lithosphere

    OpenAIRE

    Fullea, J.

    2013-01-01

    In this work we study the present-day thermal and compositional 3D structure of the  lithosphere beneath the Canary Islands and north¿western African margin. We aim to  understand the origin and evolution of Canary and north-African intraplate volcanism  and its possible link to the thinned lithosphere imaged beneath the Atlas Mountains.     We  apply  an  integrated  and  self-consistent  geophysical¿petrological  methodology  (LitMod) that combines elevation, gravity, gradiometric, geoid, s...

  12. Urban-touristic impacts on the aeolian sedimentary systems of the Canary Islands: conflict between development and conservation

    Directory of Open Access Journals (Sweden)

    Leví García-Romero

    2016-05-01

    Full Text Available Aeolian sedimentary systems in the Canary Islands differ significantly from other European and African systems due to their natural characteristics (climate, vegetation and insular isolation. Consequently, their geomorphological processes are unique. In turn, they are areas under high human pressure from touristic development. The aim of this paper is to analyze the impacts of urban-touristic development in four aeolian sedimentary systems in the Canaries: Maspalomas, Corralejo, Lambra and Jable Sur. Spatial and surface changes of variables related to geomorphology and vegetation are obtained by photo-interpretation of historical aerial photography and current orthophotos. The results indicate that the systems affected by urban-touristic development have experienced significant environmental changes. In contrast, the systems that have not been affected by building and construction of infrastructure show minor changes.

  13. Within-island differentiation and between-island homogeneity : Non-equilibrium population structure in the seaweed Cladophoropsis membranacea (Chlorophyta) in the Canary Islands

    NARCIS (Netherlands)

    van der Strate, HJ; van de Zande, L; Stam, WT; Haroun, RJ; Olsen, JL

    2003-01-01

    The seaweed Cladophoropsis membranacea forms extensive mats of coalesced thalli on coral reefs and along rocky coastlines throughout the tropics and subtropics. In a previous study on Gran Canaria, small-scale dispersal distances were found to be limited to <5 m and significant differentiation (F-ST

  14. Detailed analysis of the Canary on-sky results at the WHT using Rayleigh laser guide stars

    Science.gov (United States)

    Martin, O.; Gendron, É.; Morris, T.; Basden, A.; Hubert, Z.; Gratadour, D.; Osborn, J.; Vidal, F.; Chemla, F.; Rousset, G.; Myers, R.

    2014-07-01

    CANARY is the multi-object adaptive optics (MOAO) on-sky demonstrator developed by Durham University and LESIA Observatoire de Paris, in the perspective of the E-ELT. Since 2013, CANARY has been operating with 3 off-axis NGS and 4 off-axis Rayleigh LGS and compensating for one on-axis NGS observed with a near IR camera and the Truth Sensor (TS) for diagnostic purpose. In this paper, we present the tomographic performance of CANARY during the runs in 2013. We propose a detailed analysis of the tomographic error leading to the establishment of the CANARY wave-front error budget. In particular we are able to evaluate the tomographic error for each altitude in the atmosphere for a given reconstructor by modelling a set of one-layer covariance matrices. This tool allows us to understand the tradeoffs to be made in the building of the tomographic reconstructor. We present two methods for the wavefront error budget computation. The DTI one uses input system parameters and open loop WFS slopes to estimate the error in a number of independent terms. The DMTS method directly uses the Truth Sensor measurements to estimate the error. We show a good agreement between the two approaches making us confident in our modelling of the instrument. We derive estimations of the Strehl ratio from the error variance and compare them to the recorded IR image Strehl ratio. We find a good agreement between the two, hence validating our wavefront error analysis. Finally we present an on-sky validation of the tomographic reconstruction using LGS based on GLAO and MOAO data. We also quantify the gain brought by the LGS, comparing results obtained in MOAO with 3 NGS and with or without LGS in the wavefront measurements.

  15. Retrieval and validation of carbon dioxide, methane and water vapor for the Canary Islands IR-laser occultation experiment

    OpenAIRE

    Proschek, V.; G. Kirchengast; Schweitzer, S.; Brooke, J. S. A.; Bernath, P. F.; Thomas, C. B.; J.-G. Wang; Tereszchuk, K. A.; G. González Abad; Hargreaves, R. J.; C. A. Beale; Harrison, J J; Martin, P. A.; V. L. Kasyutich; C. Gerbig

    2015-01-01

    The first ground-based experiment to prove the concept of a novel space-based observation technique for microwave and infrared-laser occultation between low-Earth-orbit satellites was performed in the Canary Islands between La Palma and Tenerife. For two nights from 21 to 22 July 2011 the experiment delivered the infrared-laser differential transmission principle for the measurement of greenhouse gases (GHGs) in the free atmosphere. Such global and long-term stable measureme...

  16. Aquifer Recharge Estimation through Atmospheric Chloride Mass Balance at Las Cañadas Caldera, Tenerife, Canary Islands, Spain

    OpenAIRE

    Rayco Marrero-Diaz; Alcalá, Francisco J.; Nemesio M. Pérez; Dina L. López; Gladys V. Melián; Eleazar Padrón; Germán D. Padilla

    2015-01-01

    The atmospheric chloride mass balance (CMB) method was used to estimate net aquifer recharge in Las Cañadas Caldera, an endorheic summit aquifer area about 2000 m a.s.l. with negligible surface runoff, which hosts the largest freshwater reserve in Tenerife Island, Canary Islands, Spain. The wet hydrological year 2005–2006 was selected to compare yearly atmospheric chloride bulk deposition and average chloride content in recharge water just above the water table, both deduced from periodical...

  17. Discovery of a new avian bornavirus genotype in estrildid finches (Estrildidae) in Germany.

    Science.gov (United States)

    Rubbenstroth, Dennis; Schmidt, Volker; Rinder, Monika; Legler, Marko; Corman, Victor Max; Staeheli, Peter

    2014-01-31

    Avian bornaviruses (ABV) are known to be the causative agent of proventricular dilatation disease (PDD) in parrots and their relatives (Psittaciformes). A broad range of ABV genotypes has been detected not only in psittacine birds, but also in other avian species including canary birds (Serinus canaria forma domestica) and Bengalese finches (Lonchura striata f. dom.), which are both members of the order songbirds (Passeriformes). During this study 286 samples collected from captive and wild birds of various passerine species in different parts of Germany were screened for the presence of ABV. Interestingly, only three ABV-positive samples were identified by RT-PCR. They originated from one yellow-winged pytilia (Pytilia hypogrammica) and two black-rumped waxbills (Estrilda troglodytes) from a flock of captive estrildid finches in Saxony. The ABV isolates detected here were only distantly related to ABV isolates found in passerine species in Germany and Japan and form a new genotype tentatively called ABV-EF (for "estrildid finches"). PMID:24389254

  18. Yolk androgens reduce offspring survival.

    Science.gov (United States)

    Sockman, K W; Schwabl, H

    2000-07-22

    Females may favour some offspring over others by differential deposition of yolk hormones. In American kestrels (Falco sparverius), we found that yolks of eggs laid late in the sequence of a clutch had more testosterone (T) and androstenedione (A4) than yolks of first-laid eggs. To investigate the effects of these yolk androgens on nestling 'fitness', we injected both T and A4 into the yolks of first-laid eggs and compared their hatching time, nestling growth and nestling survival with those of first-laid eggs in which we injected vehicle as a control. Compared to controls, injection of T and A4 at a dose intended to increase their levels to those of later-laid eggs delayed hatching and reduced nestling growth and survival rates. Yolk androgen treatment of egg 1 had no effect on survival of siblings hatching from subsequently laid eggs. The adverse actions of yolk androgen treatment in the kestrel are in contrast to the favourable actions of yolk T treatment found previously in canaries (Serinus canaria). Additional studies are necessary in order to determine whether the deposition of yolk androgens is an adaptive form of parental favouritism or an adverse by-product of endocrine processes during egg formation. Despite its adaptive significance, such 'transgenerational' effects of steroid hormones may have helped to evolutionarily shape the hormonal mechanisms regulating reproduction. PMID:10983830

  19. Age validation of canary rockfish (Sebastes pinniger) using two independent otolith techniques: lead-radium and bomb radiocarbon dating.

    Energy Technology Data Exchange (ETDEWEB)

    Andrews, A H; Kerr, L A; Cailliet, G M; Brown, T A; Lundstrom, C C; Stanley, R D

    2007-11-04

    Canary rockfish (Sebastes pinniger) have long been an important part of recreational and commercial rockfish fishing from southeast Alaska to southern California, but localized stock abundances have declined considerably. Based on age estimates from otoliths and other structures, lifespan estimates vary from about 20 years to over 80 years. For the purpose of monitoring stocks, age composition is routinely estimated by counting growth zones in otoliths; however, age estimation procedures and lifespan estimates remain largely unvalidated. Typical age validation techniques have limited application for canary rockfish because they are deep dwelling and may be long lived. In this study, the unaged otolith of the pair from fish aged at the Department of Fisheries and Oceans Canada was used in one of two age validation techniques: (1) lead-radium dating and (2) bomb radiocarbon ({sup 14}C) dating. Age estimate accuracy and the validity of age estimation procedures were validated based on the results from each technique. Lead-radium dating proved successful in determining a minimum estimate of lifespan was 53 years and provided support for age estimation procedures up to about 50-60 years. These findings were further supported by {Delta}{sup 14}C data, which indicated a minimum estimate of lifespan was 44 {+-} 3 years. Both techniques validate, to differing degrees, age estimation procedures and provide support for inferring that canary rockfish can live more than 80 years.

  20. Tendencias poblacionales recientes de la avutarda hubara en las Islas Canarias: análisis metodológico y estado de conservación

    Directory of Open Access Journals (Sweden)

    Schuster, C.

    2012-01-01

    Full Text Available Recent population trends of the houbara bustard in the Canary Islands. Methods and conservation statusDetermining conservation status requires rigorous and reliable data about population sizes and trends, especially if they have to be applied to islands where the species have small populations. The Canary bustard houbara (Chlamydotis undulata fuertaventurae is catalogued as ‘in danger’ by the Red Book of the Birds of Spain. This work analyzes the value of previously published information on the species using the method of adjacent linear transects separated by 200 m, as a baseline for establishing robust population trends in 30 important areas (ranging from 1.3 to 12.8 km2 for the houbara in the islands of Lanzarote and Fuerteventura (Canary Islands. Censuses were repeated on the same dates (from November to December and localities as those carried out in 1994, 2004 and 2006. The detection probability of the houbara was estimated by means of distance sampling, being 0.42 up to 250 m from the observer, and 0.82 in the main census belt of 100 m on either side of the line transect. The method of adjacent linear transects —counting the maximum number of hubaras detected— provides accurate figures of population densities (detection of 95.2% of the birds. The previous estimations of houbara densities can therefore be considered highly trustworthy, with a probable average underestimation of only 5 %. Nevertheless, the confidence intervals of density estimations using only one census were very large. Therefore, with only one census per sampling area and year it is not possible to obtain precise estimates of houbara densities with small variation around the average value. This raises concern when trying to obtain solid evidence about the increases–decreases of houbara populations comparing different dates or study areas. The density of the Canary Island hubara bustard decreased significantly from 2004/2006 to 2011 in eight areas of

  1. 金丝雀痘诊断与痘病毒致弱试验%Diagnosis of Canary Pox and Study on Attenuation of the Pox Virus

    Institute of Scientific and Technical Information of China (English)

    刘永德; 陶军; 汪毅; 叶陈梁

    2001-01-01

    The canary which had some clinical symptoms was diagnosed as canary pox and the pox virus was isolated.The virus was analyzed by the animal pathogenicity test,virus attenuation,protection of the attenuated virus and virulence return experiment.The results showed that the canary pox virus could adapt to chicken embryo and cause canary death after passage 3 generations.The pox virus had no virulence for canary after passage 8 generations.The virus of 13th generation had no virulence reversion through inoculating canary three times.The canary immunized the 13th generation virus could resist the virulent pox virus challenge.%本试验对送检的金丝雀经实验室诊断,确诊为金丝雀痘。对分离的痘病毒进行动物致病性试验、病毒分离传代和致弱试验、致弱毒保护力试验和返强试验。结果表明:金丝雀痘病毒经鸡胚盲传3代后能适应鸡胚并致死金丝雀,8代后无致病性,13代毒快速通过本动物3次无返强现象。金丝雀用第13代毒刺种后30天能抵抗强毒攻击。

  2. Rehabilitación ambiental del Sitio de Interés Científico de Juncalillo del Sur (Gran Canaria)

    OpenAIRE

    Peña Estévez, Miguel Ángel

    2002-01-01

    Durante los últimos treinta años el Sitio de Interés Científico de Juncalillo del Sur (Gran Canaria) ha estado sometido a tal degradación que apenas puede cumplir con la función para la que fue declarado. El objetivo de este proyecto es recuperar una situación homóloga a la inicial, que le permita cumplir con la finalidad de protección que le marca la Ley. Para ello se ha procedido a un análisis sistémico utilizando el enfoque del marco lógico. Se proponen actuaciones para devolve...

  3. Las relaciones de los judeoconversos portugueses de Holanda con los de Canarias y América a través de su correspondencia

    Directory of Open Access Journals (Sweden)

    Luis Alberto Anaya Hernández

    2007-10-01

    Full Text Available En este trabajo analizamos el importante papel que Canarias jugó como base de los judeoconversos portugueses en su proyección americana. Gracias a unas cartas confiscadas por la Inquisición al dominico Fray Juan Afonso de Armas, conocemos las vicisitudes de algunos de estos conversos en tierras americanas. Las vicisitudes de este atípico fraile, que cambia su hábito por el de soldado y que sobrevive gracias a la picaresca nos muestra un prototipo de religioso menos infrecuente de lo que se podría pensar. También acompañamos el texto con dos poesías, una de las cuales constituye un elogio del judaismo frente al cristianismo, y en la segunda se critica a un converso que no acepta judaizar.

  4. Monitoring serum PCB levels in the adult population of the Canary Islands (Spain

    Directory of Open Access Journals (Sweden)

    Guillermo Burillo-Putze

    2015-07-01

    Full Text Available Polychlorinated biphenyls (PCBs are persistent organic chemicals that have been detected in human serum or tissues all over the world. These pollutants could exert a number of deleterious effects on humans and wildlife, including carcinogenic processes. The Spanish population of the Canary Islands was evaluated with respect to PCB levels more than ten years ago showing lower levels than other Western populations. The objective of our study was to assess the current level of contamination by PCBs showed by this population. We measured serum PCBs in a sample of healthy adult subjects (206 serum samples from subjects with an average age of 66 years old to evaluate the potential modification of PCB serum levels in this population during the last decade. PCB congeners (28, 52, 77, 81, 101, 105, 114, 118, 123, 126, 138, 153, 156, 157, 167, 169, 180, and 189 were measured by gas chromatography-mass spectrometry (GC/MS. Our results showed that PCB residues were found in 84% of serum samples analyzed, the congeners 28, 153 and 180 being the most frequently detected and at the highest median values (0.1 ng/mL. In addition, the median concentration of the sum of those PCBs considered as markers of environmental contamination by these chemicals (Marker-PCBs was 0.6 ng/mL, reaching values as high as as 2.6 ng/mL in the 95th percentile. Levels of the sum of PCBs with toxic effects similar to dioxins (dioxin-like PCBs reached median values of 0.4 ng/mL in the 95th percentile. The reported levels are similar to those described previously in this population more than ten years ago, in the sense that the inhabitants of the Canary Archipelago show levels of PCB contamination lower than the majority of populations from developed countries. These findings suggest that currently there is not any active source of these chemicals in this archipelago. Nevertheless, as foods seem to be a relevant source for these compounds, Public Health authorities should monitor the

  5. Del “mar es de todos” al mar reservado: turistas, poblaciones de pescadores y reservas marinas en Canarias

    Directory of Open Access Journals (Sweden)

    José J. Pascual

    2003-01-01

    Full Text Available Los patrones de desarrollo de las últimas décadas en Canarias y en otras zonas del Estado han originado nuevos usos del espacio marítimo y litoral. Frente a los tradicionales vinculados a la pesca, ahora dominan frecuentemente los turísticos y recreativos. La naturaleza, construida o recreada, se convierte especialmente en los últimos años en un atractivo clave para muchos destinos. En este contexto, las reservas marinas intentan preservar ciertas zonas de especial valor biológico de los excesos de la pesca, a la vez que deberían conjugar los usos turísticos y recreativos a realizar en tales espacios con la conservación de sus valores naturales. En Canarias han constituido uno de los instrumentos claves de la política de conservación y gestión de pesquerías en las áreas costeras de las Islas. Actualmente hay tres en funcionamiento, siguiendo una tendencia cada vez más general en todo el mundo. Pero a la vez que con ellas se controla la extracción de recursos por los profesionales, se impulsan una serie de usos vinculados a determinadas formas de turismo que han generado importantes transformaciones en las poblaciones vinculadas a estas zonas protegidas. Otros impactos inducidos por el turismo o la acuicultura han alterado también sus estrategias económicas o el uso de los espacios tanto en tierra como en el mar

  6. [SOCIODEMOGRAPHIC AND HEALTH CHARACTERISTICS ASSOCIATED WITH LOW BIRTH WEIGHT IN THE CANARY ISLANDS].

    Science.gov (United States)

    Bello Lujan, Luis M; Saavedra Santana, Pedro; Gutiérrez García, Luisa Esther; García Hernández, José Angel; Serra Majem, Lluis

    2015-10-01

    Introducción y objetivo: desde 1976, el término bajo peso al nacer (BPN) se aplica a todos los recién nacidos con un peso inferior a 2.500 g. y constituye el factor más importante que afecta a la mortalidad neonatal y a la morbilidad en la infancia. El objetivo de este trabajo es identificar las asociaciones entre los factores biológicos, socioeconómicos y sanitarios y el bajo peso en el recién nacido en las islas Canarias. Material y método: se realizó un estudio epidemiológico transversal, con los ficheros de las gestantes del 2011 y 2012 (n = 11,768) del Complejo Hospitalario Universitario Insular Materno de Gran Canaria, que representó el 66,3% de todos los partos de la provincia para esos años, excluyéndose del análisis los datos correspondientes a los embarazos múltiples (393) (3,3%). Se analizaron la distribución y la frecuencia del peso según características sociodemográficas; los porcentajes se compararon con el test de la 2, las medias con el t-test y las medianas con el test de Wilcoxon para datos independientes. Aquellas variables que mostraron asociación con el bajo peso en el análisis univariado fueron introducidas en un análisis logístico multidimensional. Resultados: en la distribución del peso al nacer se observó un exceso de niños con bajo peso (9,3%), de los cuales el 62,1% fueron pretérmino. Las madres de estos niños son más delgadas, de menor talla y tienen un IMC promedio de tabaquismo durante la gestación parece ser el factor mediador más importante para la restricción del crecimiento intrauterino. El sobrepeso u obesidad de la madre no parece que sean factores de riesgo para el bajo peso del niño. El crecimiento intrauterino restringido (CIR) es la variable sanitaria que más influye en el bajo peso, al igual que la hipertensión arterial de la madre, enfermedad asociada igualmente con el retraso en el crecimiento fetal. Aunque la falta de atención prenatal no puede considerarse como un factor causal del

  7. La real expedición filantrópica de la vacuna en Canarias (9 de diciembre de 1803 - 6 de enero de 1804

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    García Nieto, Víctor

    2005-12-01

    Full Text Available The conditions, circumstances and aftermath of the stay of the Balmis’ Royal Vaccinal Expedition (1803-1806 in the Canary Islands have been studied in this paper. We have focused on reports from canary witnesses rather than official and administrative data. We have records of the spreading of the vaccine out to the isles. Finally, the decisive and determinant part played by the Roman Catholic Church to achieve the objectives of the Royal Expedition has been remarked.

    Se han estudiado las circunstancias y consecuencias de la escala de la Real Expedición Filantrópica de la Vacuna (1803-1806 en el Archipiélago Canario. Nos hemos centrado en los relatos de testigos canarios más que en los datos burocráticos y administrativos. Tenemos constancia de la difusión de la vacuna en las islas. Finalmente, hemos puesto de relieve el papel determinante y decisivo de la Iglesia en la consecución de los objetivos de la Real Expedición.

  8. Parasitic helminths of the wild rabbit, Oryctolagus cuniculus, in different bioclimatic zones in Tenerife, Canary Islands.

    Science.gov (United States)

    Foronda, P; Del Castillo, A; Abreu, N; Figueruelo, E; Piñero, J; Casanova, J C

    2003-12-01

    Faunistic and ecological analyses of the wild rabbit helminth fauna were undertaken in Tenerife island (Canary Islands). Rabbits were collected between 1998 and 2000 in seven bioclimatic zones in Tenerife selected by orientation and altitude. Five parasite species were identified, three cestodes (Taenia pisiformis (larvae), Andrya cuniculi and Mosgovoyia ctenoides) and two nematodes (Trichostrongylus retortaeformis and Passalurus ambiguus). Taenia pisiformis presented an irregular distribution with significant differences in prevalences between the zones. Andrya cuniculi was only found in two zones and there were no significant differences in prevalence values. Mosgovoyia ctenoides presented a wide distribution with significant prevalences, which were higher in northern compared to southern zones. Trichostrongylus retortaeformis was absent in the low southern zones of the island. Passalurus ambiguus was found in all zones with no significant difference in the prevalence of infection. The differences in prevalences are likely to be explained by abiotic factors in the case of T. retortaeformis, and by the absence of definitive and intermediate hosts in the case of T. pisiformis and A. cuniculi, respectively. All parasite species in Tenerife are common helminths in the Iberian Peninsula, from which their rabbit hosts originated. No significant differences were recorded in the mean intensities of infection of any of the parasite species identified.

  9. Content of toxic and essential metals in canned mussels commonly consumed in Tenerife, Canary Islands, Spain.

    Science.gov (United States)

    Gutiérrez, Angel; Lozano, Gonzalo; Hardisson, Arturo; Rubio, Carmen; González, Tomás

    2004-07-01

    Concentrations of three toxic heavy metals (Hg, Pb, Cd) and six essential heavy metals (Fe, Zn, Mn, Cr, Cu, Ni) were determined in mussel conserves (Mytilus galloprovincialis, Bivalvia, Mollusca) consumed habitually by individuals in Tenerife (Canary Islands, Spain). A total of 600 samples were analyzed, corresponding to six different commercial brands and four different processing types: pickled sauce (mixture of olive oil, vinegar, red pepper, laurel, and salt), coquille St. Jacques sauce (coquille St. Jacques broth), nature (water and salt), and bionature (water, salt, and soluble vegetal fiber). Samples were collected weekly from markets in Santa Cruz de Tenerife during a 12-month period. All values for toxic metals were lower than the permitted maximum for human consumption as proscribed in European Community Directive 2001/22/CE (1,000 microg/kg wet weight for Pb and Cd) and European Community Decision 93/351/EEC (500 microg/kg wet weight for Hg). For the six essential heavy metals, mussels are a very good source, contributing high percentages of the recommended daily allowance.

  10. Molecular characterization of Acanthamoeba strains isolated from domestic dogs in Tenerife, Canary Islands, Spain.

    Science.gov (United States)

    Valladares, María; Reyes-Batlle, María; Martín-Navarro, Carmen M; López-Arencibia, Atteneri; Dorta-Gorrín, Alexis; Wagner, Carolina; Martínez-Carretero, Enrique; Piñero, José E; Valladares, Basilio; Lorenzo-Morales, Jacob

    2015-06-01

    The present study describes two cases of Acanthamoeba infections (keratitis and ascites/peritonitis) in small breed domestic dogs in Tenerife, Canary Islands, Spain. In both cases, amoebic trophozoites were observed under the inverted microscope and isolated from the infected tissues and/or fluids, without detecting the presence of other viral, fungal or bacterial pathogens. Amoebae were isolated using 2 % non-nutrient agar plates and axenified for further biochemical and molecular analyses. Osmotolerance and thermotolerance assays revealed that both isolates were able to grow up to 37 °C and 1 M of mannitol and were thus considered as potentially pathogenic. Moreover, the strains were classified as highly cytotoxic as they cause more than 75 % of toxicity when incubated with two eukaryotic cell lines. In order to classify the strains at the molecular level, the diagnostic fragment 3 (DF3) region of the 18S rDNA of Acanthamoeba was amplified and sequenced, revealing that both isolates belonged to genotype T4. In both cases, owners of the animals did not allow any further studies or follow-up and therefore the current status of these animals is unknown. Furthermore, the isolation of these pathogenic amoebae should raise awareness with the veterinary community locally and worldwide.

  11. Agrotourism, sustainable tourism and Ultraperipheral areas: The Case of Canary Islands

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    Parra López, Eduardo

    2006-01-01

    Full Text Available Ultraperipheral regions share certain common characteristics, such as their remoteness from the major supplying centres, their scanty resources, their island status or isolated location and consequent fragmentation of markets. Over the past decades, there has been an increasing awareness of the impact of ultraperiphericity on the development of a number of regions and islands. The concept of “ultraperiphericity” includes specific geographic circumstances that influence the development and specialisation of economies, competitiveness and business strategies. Agrotourism is playing an ever increasingly important role in the diversification of the agriculture, farming and tourism sectors into the Ultraperipheral Regions. Therefore, particular attention should be paid to the economic development of rural areas in Ultraperipheral Areas and to the reappraisal of agriculture, which is closely connected with tourism. Agrotourism is essential to diversify, transform and improve the competitiveness and quality of farms. This paper examines the impact of Agrotourism as an alternative to sun and sand tourism, resulting in the growth of family income, in rural development and, in short, in new approaches to the tourism industry. A further goal of the paper is to develop a strategic analysis of Agrotourism, studying both supply and demand in the Canary Islands

  12. THE CASE OF THE SINDHI TRADERS IN THE CANARY ISLANDS: TRANSNATIONAL RELATIONS AND ECONOMIC ACTIVITY

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    Ana María López Sala

    2010-12-01

    Full Text Available This article describes and analyses the presence and trading activities of the Sindhi community in the Canary Islands. This group is one of the oldest Asian diasporas in Spain, and is characterised by its hectic trading activity and, particularly, by the fact that it maintains a network of transnational contacts that shows that the community is established in over 100 countries. The starting point of the analysis is the historical, geographic and cultural context that favoured the exodus and arrival of this community to these islands. As other authors have mentioned in studies on transnationalism, and as these authors highlight very clearly with the group examined in this article, relations with members of the same community residing in other countries become forms of capital that provide information and communication on business opportunities and strategies in local enclaves, such as the loaning of capital and training opportunities in commercial activities and specific newly-created businesses that are adapted to certain geographic areas. The Sindhis are a community that, while it has remained faithful to its traditions and is relatively secretive, since the 1950s and with the rise of tourism, it has diversified in its areas of business and its establishment in the territory.

  13. Canary tomato export prices: comparison and relationships between daily seasonal patterns

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    G. Martin-Rodriguez

    2013-10-01

    Full Text Available Statistical procedures are proposed to describe, compare and forecast the behaviour of seasonal variations in two daily price series of Canary tomato exported to German and British markets, respectively, over the last decade. These seasonal patterns are pseudo-periodic as the length of the seasonal period changes frequently in dependence of market conditions. Seasonal effect at a day in the harvesting period is defined as a spline function of the proportion of the length of such a period elapsed up to such a day. Then, seasonal patterns for the two series are compared in terms of the area between the corresponding spline functions. The ability of these models to capture the dynamic process of change in the seasonal pattern is useful to forecasting purpose. Furthermore, an analytical tool is also proposed to obtain forecasts of the seasonal pattern in one of these two series from the forecasts of the seasonal pattern in the other one. These procedures are useful for farmers in developing strategies related to the seasonal distribution of tomato production exported to each market.

  14. Greenhouse gas measurements over a 144 km open path in the Canary Islands

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    J. S. A. Brooke

    2012-05-01

    Full Text Available A new technique for the satellite remote sensing of greenhouse gases in the atmosphere via the absorption of short-wave infrared laser signals transmitted between counter-rotating satellites in low earth orbit has recently been proposed; this would enable the acquisition of a stable, global set of altitude-resolved concentration measurements. We present the first ground-based experimental demonstration of this new technique, in which the atmospheric absorption of CO2 near 2.1 μm was measured over a ~144 km path length between two peaks in the Canary Islands (at an altitude of ~2.4 km. The retrieved CO2 volume mixing ratio of 400.1 ppm (±14.7 ppm is consistent within experimental uncertainty with simultaneously recorded in situ validation measurements. We conclude that the new method has a sound basis for monitoring CO2 and other greenhouse gases in the free atmosphere.

  15. Classification of commercial wines from the Canary Islands (Spain) by chemometric techniques using metallic contents.

    Science.gov (United States)

    Frías, Sergio; Conde, José E; Rodríguez-Bencomo, Juan J; García-Montelongo, Francisco; Pérez-Trujillo, Juan P

    2003-02-01

    Eleven elements, K, Na, Ca, Mg, Fe, Cu, Zn, Mn, Sr, Li and Rb, were determined in dry and sweet wines bearing the denominations of origin of El Hierro, La Palma and Lanzarote islands (Canary Islands, Spain). Analyses were performed by flame atomic absorption spectrophotometry, with the exceptions of lithium and rubidium for which flame atomic emission spectrophotometry was used. Sweet wines from La Palma were elaborated as naturally sweet with over-ripe grapes and significant differences were found in all the analysed elements with the exceptions of sodium, iron and rubidium with regard to dry wines from the same island. Contrarily, sweet wines from Lanzarote elaborated with grapes in a similar ripening state to dry wines did not present significant differences between them with the exception of strontium, the content of which was greater in dry wines. Among the three islands, significant differences in mean content were found with the exceptions of iron and copper. Cluster analysis and principal component analysis show differences in wines according to the island of origin and the ripening state of the grapes. Linear discriminant analysis using rubidium, sodium, manganese and strontium, the four most discriminant elements, gave 100% recognition ability and 95.6% prediction ability. The sensitivity and specificity obtained using soft independent modelling of class analogy (SIMCA) as a modelling multivariate technique were both 100% for El Hierro and Lanzarote, and 100 and 95%, respectively, for La Palma. The modelling and discriminant capacities of the different metals were also studied. PMID:18968916

  16. Greenhouse gas measurements over a 144 km open path in the Canary Islands

    Directory of Open Access Journals (Sweden)

    J. S. A. Brooke

    2012-09-01

    Full Text Available A new technique for the satellite remote sensing of greenhouse gases in the atmosphere via the absorption of short-wave infrared laser signals transmitted between counter-rotating satellites in low Earth orbit has recently been proposed; this would enable the acquisition of a long-term, stable, global set of altitude-resolved concentration measurements. We present the first ground-based experimental demonstration of this new infrared-laser occultation method, in which the atmospheric absorption of CO2 near 2.1 μm was measured over a ~144 km path length between two peaks in the Canary Islands (at an altitude of ~2.4 km, using relatively low power diode lasers (~4 to 10 mW. The retrieved CO2 volume mixing ratio of 400 ppm (±15 ppm is consistent within experimental uncertainty with simultaneously recorded in situ validation measurements. We conclude that the new method has a sound basis for monitoring CO2 in the free atmosphere; other greenhouse gases such as methane, nitrous oxide and water vapour can be monitored in the same way.

  17. Comments on Uncertainty in Groundwater Governance in the Volcanic Canary Islands, Spain

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    Emilio Custodio

    2015-06-01

    Full Text Available The uncertainty associated with natural magnitudes and processes is conspicuous in water resources and groundwater evaluation. This uncertainty has an essential component and a part that can be reduced to some extent by increasing knowledge, improving monitoring coverage, continuous elaboration of data and accuracy and addressing the related economic and social aspects involved. Reducing uncertainty has a cost that may not be justified by the improvement that is obtainable, but that has to be known to make the right decisions. With this idea, this paper contributes general comments on the evaluation of groundwater resources in the semiarid Canary Islands and on some of the main sources of uncertainty, but a full treatment is not attempted, nor how to reduce it. Although the point of view is local, these comments may help to address similar situations on other islands where similar problems appear. A consequence of physical and hydrological uncertainty is that different hydrogeological and water resource studies and evaluations may yield different results. Understanding and coarsely evaluating uncertainty helps in reducing administrative instability, poor decisions that may harm groundwater property rights, the rise of complaints and the sub-optimal use of the scarce water resources available in semiarid areas. Transparency and honesty are needed, but especially a clear understanding of what numbers mean and the uncertainty around them, to act soundly and avoid conflicting and damaging rigid attitudes. However, the different situations could condition that what may be good in a place, may not always be the case in other places.

  18. Isolation of thermotolerant Vermamoeba vermiformis strains from water sources in Lanzarote Island, Canary Islands, Spain.

    Science.gov (United States)

    Reyes-Batlle, María; Wagner, Carolina; Zamora-Herrera, Jonadab; Vargas-Mesa, Alejandro; Sifaoui, Ines; González, Ana C; López-Arencibia, Atteneri; Valladares, Basilio; Martínez-Carretero, Enrique; Piñero, José E; Lorenzo-Morales, Jacob

    2016-09-01

    In this study, twenty water samples were collected in the island of Lanzarote, Canary Islands, Spain in order to check for the presence of V. vermiformis strains in these samples. Water samples were cultured on 2% Non-Nutrient Agar (NNA) plates covered with a thin layer of heat killed E. coli and checked daily for the presence of Vermamoeba. After a week, V. vermiformis amoebae were observed in 2 of the 20 processed samples (10%) incubated at room temperature and 37°C. Molecular characterization was carried out by amplifying the 18S rDNA gene and DNA sequencing in order to confirm the identity of the isolated amoebic strains. To the best of our knowledge, this is the first report on the presence of FLA in environmental sources in Lanzarote Island and the first report of Vermamoeba vermiformis in water sources in this island. Furthermore, the two strains isolated in this study were collected in recreational areas with close contact with humans and thus awareness should be raised. PMID:27447234

  19. Plasmodium delichoni n. sp.: description, molecular characterisation and remarks on the exoerythrocytic merogony, persistence, vectors and transmission.

    Science.gov (United States)

    Valkiūnas, Gediminas; Ilgūnas, Mikas; Bukauskaitė, Dovilė; Žiegytė, Rita; Bernotienė, Rasa; Jusys, Vytautas; Eigirdas, Vytautas; Fragner, Karin; Weissenböck, Herbert; Iezhova, Tatjana A

    2016-07-01

    Malaria parasite Plasmodium (Novyella) delichoni n. sp. (Haemosporida, Plasmodiidae) was found in a widespread Eurasian songbird, the common house martin Delichon urbicum (Hirundinidae). It is described based on the morphology of its blood stages and segments of the mitochondrial cytochrome b and apicoplast genes, which can be used for molecular identification of this species. Erythrocytic meronts and gametocytes are strictly nucleophilic, and mature gametocytes possess pigment granules of markedly variable size, including large ones (1 μm in length). Due to these features, P. delichoni can be readily distinguished from all described species of avian malaria parasites belonging to subgenus Novyella. Additionally, mature erythrocytic merozoites contain a dense clump of chromatin, a rare character in avian malaria parasites. Erythrocytic merogony is asynchronous. Illustrations of blood stages of the new species are given, and phylogenetic analysis identifies DNA lineages closely related to this parasite. Domestic canary Serinus canaria and Eurasian siskin Carduelis spinus were infected after subinoculation of infected blood obtained from the house martin. Parasitemia was long lasting in both these hosts, but it was high (up to 70 %) in Eurasian siskins and low (up to 1 %) in canaries. Mortality was not observed, and histological examination and chromogenic in situ hybridisation did not reveal secondary exoerythrocytic meronts (phanerozoites) in the exposed birds. It is likely that persistence of this infection occurs due to long-lasting parasitemia in avian hosts. Sporogony was abortive in mosquitoes Culex pipiens pipiens form molestus, Culex quinquefasciatus and Aedes aegypti at gametogenesis or ookinete stages. The new species is absent from juvenile birds at breeding sites in Europe, indicating that transmission occurs at African wintering grounds. PMID:27000087

  20. Genetically depauperate in the continent but rich in oceanic islands: Cistus monspeliensis (Cistaceae in the Canary Islands.

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    Mario Fernández-Mazuecos

    Full Text Available BACKGROUND: Population genetic theory holds that oceanic island populations are expected to have lower levels of genetic variation than their mainland counterparts, due to founder effect after island colonization from the continent. Cistus monspeliensis (Cistaceae is distributed in both the Canary Islands and the Mediterranean region. Numerous phylogenetic results obtained in the last years allow performing further phylogeographic analyses in Cistus. METHODOLOGY/PRINCIPAL FINDINGS: We analyzed sequences from multiple plastid DNA regions in 47 populations of Cistus monspeliensis from the Canary Islands (21 populations and the Mediterranean basin (26 populations. The time-calibrated phylogeny and phylogeographic analyses yielded the following results: (1 a single, ancestral haplotype is distributed across the Mediterranean, whereas 10 haplotypes in the Canary Islands; (2 four haplotype lineages are present in the Canarian Islands; (3 multiple colonization events across the archipelago are inferred; (4 the earliest split of intraspecific lineages occurred in the Early to Middle Pleistocene (<930,000 years BP. CONCLUSIONS/SIGNIFICANCE: The contrasting pattern of cpDNA variation is best explained by genetic bottlenecks in the Mediterranean during Quaternary glaciations, while the Canarian archipelago acted as a refugium of high levels of genetic diversity. Active colonization across the Canarian islands is supported not only by the distribution of C. monspeliensis in five of the seven islands, but also by our phylogeographic reconstruction in which unrelated haplotypes are present on the same island. Widespread distribution of thermophilous habitats on every island, as those found throughout the Mediterranean, has likely been responsible for the successful colonization of C. monspeliensis, despite the absence of a long-distance dispersal mechanism. This is the first example of a plant species with higher genetic variation among oceanic island

  1. On the occurrence of egg masses of the diamond-shaped squid Thysanoteuthis rhombus Troschel, 1857 in the subtropical eastern Atlantic (Canary Islands. A potential commercial species?

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    Alejandro Escanez

    2012-09-01

    Full Text Available Data on opportunistic sightings of diamond-shaped squid Thysanoteuthis rhombus egg masses in the Canary Islands (Atlantic Ocean are presented. A total of 16 egg masses of this species were recorded and photographed from 2000 to 2010 around the western islands of the archipelago (El Hierro, Tenerife and La Gomera. These data reveal the existence of an important spawning area for diamond-shaped squid around the Canary Islands, in subtropical east Atlantic waters. We provide preliminary data for the potential development of an artisanal fishery focused on this species, and a discussion on its potential impacts on the marine ecosystem.

  2. Abundance and distribution of sperm whales in the Canary Islands : can sperm whales in the Archipelago sustain the current level of ship-strike mortalities?

    OpenAIRE

    Andrea Fais; Tim P Lewis; Zitterbart, Daniel P.; Omar Álvarez; Ana Tejedor; Natacha Aguilar de Soto

    2016-01-01

    Funding was provided through an agreement between the Canary Islands Government and the Spanish Ministries of the Environment and Defence. Additional survey effort on the Amanay, Banquete and Concepción seamounts was funded by the Fundación Biodiversidad-MAGRAMA via the LIFE-INDEMARES project. Sperm whales are present in the Canary Islands year-round, suggesting that the archipelago is an important area for this species in the North Atlantic. However, the area experiences one of the highes...

  3. New data on the Tanaidacea (Crustacea: Peracarida) from the Canary Islands, with a description of a new species of Apseudopsis.

    Science.gov (United States)

    Esquete, Patricia; Ramos, Eva; Riera, Rodrigo

    2016-03-21

    Benthic samples from two harbours at El Hierro and Tenerife (Canary Islands) yielded three species of Tanaidacea. Tanais dulongii and Leptochelia savignyi are recorded for the first time in Tenerife and El Hierro, respectively. A new species of Apseudomorpha, Apseudopsis rogi, was collected in both harbours and can be differentiated from other species of the genus by the male having a cheliped merus with a distinctive, cylindrical dorso-proximal spur. This is the first species of Apseudopsis described for the Macaronesian region. A key to the Atlantic and Mediterranean species of Apseudopsis is provided.

  4. A methodology for optimization of wind farm allocation under land restrictions: the case of the Canary Islands

    Science.gov (United States)

    Castaño Moraga, C. A.; Suárez Santana, E.; Sabbagh Rodríguez, I.; Nebot Medina, R.; Suárez García, S.; Rodríguez Alvarado, J.; Piernavieja Izquierdo, G.; Ruiz Alzola, J.

    2010-09-01

    Wind farms authorization and power allocations to private investors promoting wind energy projects requires some planification strategies. This issue is even more important under land restrictions, as it is the case of Canary Islands, where numerous specially protected areas are present for environmental reasons and land is a scarce resource. Aware of this limitation, the Regional Government of Canary Islands designed the requirements of a public tender to grant licences to install new wind farms trying to maximize the energy produced in terms of occupied land. In this paper, we detail the methodology developed by the Canary Islands Institute of Technology (ITC, S.A.) to support the work of the technical staff of the Regional Ministry of Industry, responsible for the evaluation of a competitive tender process for awarding power lincenses to private investors. The maximization of wind energy production per unit of area requires an exhaustive wind profile characterization. To that end, wind speed was statistically characterized by means of a Weibull probability density function, which mainly depends on two parameters: the shape parameter K, which determines the slope of the curve, and the average wind speed v , which is a scale parameter. These two parameters have been evaluated at three different heights (40,60,80 m) over the whole canarian archipelago, as well as the main wind speed direction. These parameters are available from the public data source Wind Energy Map of the Canary Islands [1]. The proposed methodology is based on the calculation of an initially defined Energy Efficiency Basic Index (EEBI), which is a performance criteria that weighs the annual energy production of a wind farm per unit of area. The calculation of this parameter considers wind conditions, windturbine characteristics, geometry of windturbine distribution in the wind farm (position within the row and column of machines), and involves four steps: Estimation of the energy produced by

  5. New data on the Tanaidacea (Crustacea: Peracarida) from the Canary Islands, with a description of a new species of Apseudopsis.

    Science.gov (United States)

    Esquete, Patricia; Ramos, Eva; Riera, Rodrigo

    2016-01-01

    Benthic samples from two harbours at El Hierro and Tenerife (Canary Islands) yielded three species of Tanaidacea. Tanais dulongii and Leptochelia savignyi are recorded for the first time in Tenerife and El Hierro, respectively. A new species of Apseudomorpha, Apseudopsis rogi, was collected in both harbours and can be differentiated from other species of the genus by the male having a cheliped merus with a distinctive, cylindrical dorso-proximal spur. This is the first species of Apseudopsis described for the Macaronesian region. A key to the Atlantic and Mediterranean species of Apseudopsis is provided. PMID:27394493

  6. Does mesoscale matters in decadal changes observed in the northern Canary upwelling system?

    Science.gov (United States)

    Relvas, P.; Luís, J.; Santos, A. M. P.

    2009-04-01

    The Western Iberia constitutes the northern limb of the Canary Current Upwelling System, one of the four Eastern Boundary Upwelling Systems of the world ocean. The strong dynamic link between the atmosphere and the ocean makes these systems highly sensitive to global change, ideal to monitor and investigate its effects. In order to investigate decadal changes of the mesoscale patterns in the Northern Canary upwelling system (off Western Iberia), the field of the satellite-derived sea surface temperature (SST) trends was built at the pixel scale (4x4 km) for the period 1985-2007, based on the monthly mean data from the Advanced Very High Resolution Radiometer (AVHRR) on board NOAA series satellites, provided by the NASA Physical Oceanography Distributed Active Archive Center (PO.DAAC) at the Jet Propulsion Laboratory. The time series were limited to the nighttime passes to avoid the solar heating effect and a suite of procedures were followed to guarantee that the temperature trends were not biased towards the seasonally more abundant summer data, when the sky is considerably clear. A robust linear fit was applied to each individual pixel, crossing along the time the same pixel in all the processed monthly mean AVHRR SST images from 1985 until 2007. The field of the SST trends was created upon the slopes of the linear fits applied to each pixel. Monthly mean SST time series from the one degree enhanced International Comprehensive Ocean-Atmosphere Data Set (ICOADS) and from near-shore measurements collected on a daily basis by the Portuguese Meteorological Office (IM) are also used to compare the results and extend the analysis back until 1960. A generalized warming trend is detected in the coastal waters off Western Iberia during the last decades, no matter which data set we analyse. However, significant spatial differences in the warming rates are observed in the satellite-derived SST trends. Remarkably, off the southern part of the Western Iberia the known

  7. An Improved Method to Retrieve Surface Emissivity in a Canary Pine Forest Using Aster Data

    Science.gov (United States)

    Barreto-Velasco, Africa; Hernandez-Leal, Pedro A.; Arbelo, Manuel; Podesta, Guillermo P.

    2012-07-01

    The widely-used Temperature and Emissivity Separation (TES) algorithm has been shown to provide reliable temperature and emissivity estimates from land-leaving thermal data. Nevertheless, TES has some important limitations mainly related to its inability to correct important inaccuracies for gray bodies, such as vegetation. In this study, this problem is addressed through an improvement to the current NEM (Normalized Emissivity Method) module included in the TES algorithm. The proposed method, called Modified NEM (ModNEM), has been specifically designed to retrieve an accurate surface emissivity for bodies with a spectral behavior typical of gray-bodies, i. e., flat and near spectrally invariant. ModNEM selects two different approximations of surface temperature instead of the usual maximum temperature, with the aim of accounting for the peculiar spectral behavior of brightness temperature and emissivity for vegetation. The NEM and TES, as well as the ModNEM, have been used to recover surface emissivity in a pine forest located in Tenerife Island (Canary Islands, Spain) using data from the Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER). Results have been compared and validated using reference emissivity values obtained from the pines by means of the box method. This validation study showed that high uncertainties are associated with the standard techniques (up to 0.034), whereas ModNEM results in lower uncertainties in emissivity estimates (NEM module are not suitable for surfaces with a spectral behavior similar to a grey body. This work was supported by MICINN under Grant CGL2010-22189-C02.

  8. Radial variation in sap flow in five laurel forest tree species in Tenerife, Canary Islands.

    Science.gov (United States)

    Jiménez, M. Soledad; Nadezhdina, Nadezhda; Cermák, Jan; Morales, Domingo

    2000-11-01

    Variations in radial patterns of xylem water content and sap flow rate were measured in five laurel forest tree species (Laurus azorica (Seub.) Franco, Persea indica (L.) Spreng., Myrica faya Ait., Erica arborea L. and Ilex perado Ait. ssp. platyphylla (Webb & Berth.) Tutin) growing in an experimental plot at Agua García, Tenerife, Canary Islands. Measurements were performed around midday during warm and sunny days by the heat field deformation method. In all species, water content was almost constant (around 35% by volume) over the whole xylem cross-sectional area. There were no differences in wood color over the whole cross-sectional area of the stem in most species with the exception of E. arborea, whose wood became darker in the inner layers. Radial patterns of sap flow were highly variable and did not show clear relationships with tree diameter or species. Sap flow occurred over the whole xylem cross-sectional area in some species, whereas it was limited to the outer xylem layers in others. Sap flow rate was either similar along the xylem radius or exhibited a peak in the outer part of the xylem area. Low sap flow rates with little variation in radial pattern were typical for shaded suppressed trees, whereas dominant trees exhibited high sap flow rates with a peak in the radial pattern. Stem damage resulted in a significant decrease in sap flow rate in the outer xylem layers. The outer xylem is more important for whole tree water supply than the inner xylem because of its larger size. We conclude that measurement of radial flow pattern provides a reliable method of integrating sap flow from individual measuring points to the whole tree.

  9. Integrated assessment of air pollution using observations and modelling in Santa Cruz de Tenerife (Canary Islands).

    Science.gov (United States)

    Baldasano, José M; Soret, Albert; Guevara, Marc; Martínez, Francesc; Gassó, Santiago

    2014-03-01

    The present study aims to analyse the atmospheric dynamics of the Santa Cruz de Tenerife region (Tenerife, Canary Islands). This area is defined by the presence of anthropogenic emissions (from a refinery, a port and road traffic) and by very specific meteorological and orographic conditions-it is a coastal area with a complex topography in which there is an interaction of regional atmospheric dynamics and a low thermal inversion layer. These factors lead to specific atmospheric pollution episodes, particularly in relation to SO2 and PM10. We applied a methodology to study these dynamics based on two complementary approaches: 1) the analysis of the observations from the air quality network stations and 2) simulation of atmospheric dynamics using the WRF-ARW/HERMESv2/CMAQ/BSC-DREAM8b and WRF-ARW/HYSPLIT modelling systems with a high spatial resolution (1×1 km(2)). The results of our study show that the refinery plume plays an important role in the maximum SO2 observed levels. The area of maximum impact of the refinery is confined to a radius of 3 km around this installation. A cluster analysis performed for the period: 1998-2011 identified six synoptic situations as predominant in the area. The episodes of air pollution by SO2 occur mainly in those with more limited dispersive conditions, such as the northeastern recirculation, the northwestern recirculation and the western advection, which represent 33.70%, 11.23% and 18.63% of the meteorological situations affecting the study area in the year 2011, respectively. In the case of particulate matter, Saharan dust intrusions result in episodes with high levels of PM10 that may exceed the daily limit value in all measurement station; these episodes occur when the synoptic situation is from the east (3.29% of the situations during the year 2011).

  10. Source areas and long-range transport of pollen from continental land to Tenerife (Canary Islands).

    Science.gov (United States)

    Izquierdo, Rebeca; Belmonte, Jordina; Avila, Anna; Alarcón, Marta; Cuevas, Emilio; Alonso-Pérez, Silvia

    2011-01-01

    The Canary Islands, due to their geographical position, constitute an adequate site for the study of long-range pollen transport from the surrounding land masses. In this study, we analyzed airborne pollen counts at two sites: Santa Cruz de Tenerife (SCO), at sea level corresponding to the marine boundary layer (MBL), and Izaña at 2,367 m.a.s.l. corresponding to the free troposphere (FT), for the years 2006 and 2007. We used three approaches to describe pollen transport: (1) a classification of provenances with an ANOVA test to describe pollen count differences between sectors; (2) a study of special events of high pollen concentrations, taking into consideration the corresponding meteorological synoptic pattern responsible for transport and back trajectories; and (3) a source-receptor model applied to a selection of the pollen taxa to show pollen source areas. Our results indicate several extra-regional pollen transport episodes to Tenerife. The main provenances were: (1) the Mediterranean region, especially the southern Iberian Peninsula and Morocco, through the trade winds in the MBL. These episodes were characterized by the presence of pollen from trees (Casuarina, Olea, Quercus perennial and deciduous types) mixed with pollen from herbs (Artemisia, Chenopodiaceae/Amaranthaceae and Poaceae wild type). (2) The Saharan sector, through transport at the MBL level carrying pollen principally from herbs (Chenopodiaceae-Amaranthaceae, Cyperaceae and Poaceae wild type) and, in one case, Casuarina pollen, uplifted to the free troposphere. And (3) the Sahel, characterized by low pollen concentrations of Arecaceae, Chenopodiaceae-Amaranthaceae, Cyperaceae and Poaceae wild type in sporadic episodes. This research shows that sporadic events of long-range pollen transport need to be taken into consideration in Tenerife as possible responsible agents in respiratory allergy episodes. In particular, it is estimated that 89-97% of annual counts of the highly allergenous Olea

  11. Blood Dendritic Cells: Canary in the Coal Mine to Predict Chronic Inflammatory Disease?

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    Brodie eMiles

    2014-01-01

    Full Text Available The majority of risk factors for chronic inflammatory diseases are unknown. This makes personalized medicine for assessment, prognosis, and choice of therapy very difficult. It is becoming increasingly clear, however, that low-grade subclinical infections may be an underlying cause of many chronic inflammatory diseases and thus may contribute to secondary outcomes (e.g. cancer. Many diseases are now categorized as inflammatory-mediated diseases that stem from a dysregulation in host immunity. There is a growing need to study the links between low-grade infections, the immune responses they elicit, and how this impacts overall health. One such link explored in detail here is the extreme sensitivity of myeloid dendritic cells (mDC in peripheral blood to chronic low-grade infections and the role that these mDCs play in arbitrating the resulting immune responses. We find that emerging evidence supports a role for pathogen-induced mDCs in chronic inflammation leading to increased risk of secondary clinical disease. The mDCs that are elevated in the blood as a result of low-grade bacteremia often do not trigger a productive immune response, but can disseminate the pathogen throughout the host. This aberrant trafficking of mDCs can accelerate systemic inflammatory disease progression. Conversely, restoration of DC homeostasis may aid in pathogen elimination and minimize dissemination. Thus it would seem prudent when assessing chronic inflammatory disease risk to consider blood mDC numbers, and the microbial content (microbiome and activation state of these mDCs. These may provide important clues (the canary in the coal mine of high inflammatory disease risk. This will facilitate development of novel immunotherapies to eliminate such smoldering infections in atherosclerosis, cancer, rheumatoid arthritis, and pre-eclampsia.

  12. Grazing effects on species composition in different vegetation types (La Palma, Canary Islands)

    Science.gov (United States)

    Arévalo, J. R.; de Nascimento, L.; Fernández-Lugo, S.; Mata, J.; Bermejo, L.

    2011-05-01

    Grazing management is probably one of the most extensive land uses, but its effects on plant communities have in many cases been revealed to be contradictory. Some authors have related these contradictions to the stochastic character of grazing systems. Because of that, it is necessary to implement specific analyses of grazing effects on each community, especially in natural protected areas, in order to provide the best information to managers. We studied the effects of grazing on the species composition of the main vegetation types where it takes place (grasslands, shrublands and pine forests) on the island of La Palma, Canary Islands. We used the point-quadrat intersect method to study the species composition of grazed and ungrazed areas, which also were characterized by their altitude, distance to farms, distance to settlements, year of sampling, herbaceous aboveground biomass and soil organic matter. The variables organic matter, productivity and species richness were not significantly affected by grazing. The species composition of the analyzed plant communities was affected more by variables such as altitude or distance to farms than by extensive grazing that has been traditionally carried out on the island of La Palma involving certain practices such as continuous monitoring of animals by goat keepers, medium stocking rates adjusted to the availability of natural pastures, supplementation during the dry season using local forage shrubs or mown pastures and rotating animals within grazing areas Although some studies have shown a negative effect of grazing on endangered plant species, these results cannot be freely extrapolated to the traditional grazing systems that exert a low pressure on plant communities (as has been found in this study). We consider extensive grazing as a viable way of ensuring sustainable management of the studied ecosystems.

  13. Distribution and genetic variation of hymenolepidid cestodes in murid rodents on the Canary Islands (Spain

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    Feliu Carlos

    2011-09-01

    Full Text Available Abstract Background In the Canary Islands there are no previous data about tapeworms (Cestoda of rodents. In order to identify the hymenolepidid species present in these hosts, a survey of 1,017 murine (349 Rattus rattus, 13 Rattus norvegicus and 655 Mus musculus domesticus was carried out in the whole Archipelago. Molecular studies based on nuclear ITS1 and mitochondrial COI loci were performed to confirm the identifications and to analyse the levels of genetic variation and differentiation. Results Three species of hymenolepidids were identified: Hymenolepis diminuta, Rodentolepis microstoma and Rodentolepis fraterna. Hymenolepis diminuta (in rats and R. microstoma (in mice showed a widespread distribution in the Archipelago, and R. fraterna was the least spread species, appearing only on five of the islands. The hymenolepidids found on Fuerteventura, Lanzarote and La Graciosa were restricted to one area. The COI network of H. diminuta showed that the haplotypes from Lanzarote and Fuerteventura are the most distant with respect to the other islands, but clearly related among them. Conclusions Founder effects and biotic and abiotic factors could have played important role in the presence/absence of the hymenolepidid species in determined locations. The haplotypes from the eastern islands (Fuerteventura and Lanzarote seem to have shared an ancestral haplotype very distant from the most frequent one that was found in the rest of the islands. Two colonization events or a single event with subsequent isolation and reduced gene flow between western-central and eastern islands, have taken place in the Archipelago. The three tapeworms detected are zoonotic species, and their presence among rodents from this Archipelago suggests a potential health risk to human via environmental contamination in high risk areas. However, the relatively low prevalence of infestations detected and the focal distribution of some of these species on certain islands reduce

  14. Valoración económica de las características espaciales de las casas rurales en Gran Canaria

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    Hernández Guerra, Juan María

    2009-01-01

    Full Text Available RESUMEN Este trabajo analiza la influencia de algunas características espaciales sobre los precios por noche de casas rurales en Gran Canaria. Se estimó para ello un modelo de precios hedónicos que incluye en su formulación ciertos atributos espaciales de la casa, tales como el número de vecinos en un radio determinado. Estas variables fueron calculadas por medio de un Sistema de Información Geográfica (SIG. También se analizaron otros factores incluidos tradicionalmente en estos modelos, como las características estructurales de la casa y la distancia a lugares de interés. Se aplicaron técnicas de econometría espacial para contrastar la existencia de autocorrelación espacial en los precios. En general, los resultados indican que el alejamiento de la casa incrementa el precio de alquiler. Estos resultados pueden ser útiles en el debate entre los gestores políticos y también la población local sobre el desarrollo futuro de esta incipiente industria. ABSTRACT This paper analyses the influence of some spatial characteristics in the rental prices of rural houses in Gran Canaria. To do this, a hedonic prices model was estimated, which includes certain spatial attributes of the house in its formulation, such as the land use and the number of neighbours in a given radius around the house. The variables were estimated by means of a Geographic Information System (GIS. Other factors traditionally included in hedonic models are also analysed, such as the structural characteristics of the house and distance to some amenities. Spatial econometrics was applied to check the spatial autocorrelation of rental prices. In general, results point out that remoteness increases the rental price of rural houses. These findings may be useful in the debate among policy makers and also local population on the future development of the nowadays incipient industry.

  15. Caracterización del ambiente atmosférico en Las Palmas de Gran Canaria y Santa Cruz de Tenerife. 2000 a 2004

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    Elena López Villarrubia

    2008-01-01

    Full Text Available Fundamento: El carácter insular de las ciudades de Las Palmas de Gran Canaria y Santa Cruz de Tenerife, su meteorología y la proximidad del continente africano que favorece la llegada de material particulado de origen natural sobre las islas, determinan unas especificidades en su calidad del aire. El objetivo de este artículo es la caracterización de la contaminación atmosférica durante los años 2000 a 2004 como indicador de exposición de los habitantes de estas dos ciudades. Métodos: Se elaboraron los siguientes indicadores de contaminación: promedios de 24 horas de PM10, PM2,5, NO2, SO2 y O3; máximo de las 17 medias móviles octohorarias diarias de O3 y CO; máximo horario diario de SO2, NO2, O3, CO, PM10 y PM2,5. También se calcularon los niveles de la moda gruesa de partículas, como la diferencia entre los valores de PM10 y PM2,5 (PM10-2,5. Se identificaron episodios de intrusión africana. Resultados: En Sta Cruz de TF los promedios de SO2 (14ug/m3N y de O3 (44,4 ug/m3N fueron superiores respecto a los de Las Palmas de GC (8 y 28,3 ug/m3N. Los promedios de NO2 en Las Palmas de GC: 45,8 ug/m3N fueron superiores a los de Sta. Cruz de TF: 30,3 ug/m3N. Debido a las intrusiones africanas, algunos días superaron los 600 ug/m3 de PM10 y los 200 de PM2.5 en ambas ciudades. Conclusiones: Se identifica un patrón de calidad del aire con episodios de polvo mineral africano que en superficie afecta a todas las fracciones granulométricas, una estacionalidad diferente a las ciudades europeas respecto al ozono, así como un patrón de contaminación urbano-industrial en Sta. Cruz de Tf y netamente urbano en Las Palmas de GC. Se hace necesario tener en cuenta estos resultados para analizar su posible impacto sobre la salud de los ciudadanos de las Islas Canarias y establecer sistemas adecuados de vigilancia.

  16. Análisis e impacto de los touroperadores y las agencias de viaje en el transporte turístico: nuevas tendencias en Canarias

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    Parra López, Eduardo

    2003-01-01

    Full Text Available The international tourism transport sector is facing profound changes in its structure, particularly where tour operators and travel agencies are concerned. New reservation distribution systems (GDS and CRS and interactive television systems are setting new guidelines for the sector. The worldwide platform of the Internet has created a new context, which is rapidly emerging and becoming ever more dynamic. For this reason, travel organisations should explore the proliferation of management tools that facilitate the establishment of new competitive strategies and positioning in an increasingly volatile area, with new products and forms in both demand and supply. This exploratory study identifies and interprets several questions based on a survey of 82 hotel and travel agency managers in the Canary Islands, who express their views about current and future developments in the sector

  17. Modernidad arquitectónica atlántica y restauración en Canarias: la casa Ossuna de Alejandro Beautell en La Laguna

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    Carlos Javier Castro Brunetto

    2013-12-01

    Full Text Available This article discusses the renovation of the Ossuna House (2009-2011 in San Cristóbal de la Laguna in Tenerife. Faced with a plethora of options Alejandro Beautell harmonises the principles of popular Atlantic architecture together with new building materials from contemporary architecture in the Canary Islands. By doing so, he takes on the challenge of renovating a domestic space from the eighteenth century. The materials provide the project with a great conceptual uniqueness as they combine the historic value of the building with a touch of modernity. The timelessness of certain architectural resources complicates the narrative as well as the ability to estimate authenticity; however, the technical rigour of the processes and actions that are completely reversible are the most relevant part of the project.

  18. Macrorhabdus ornithogaster in ostrich, rhea, canary, zebra finch, free range chicken, turkey, guinea-fowl, columbina pigeon, toucan, chuckar partridge and experimental infection in chicken, japanese quail and mice Macrorhabdus ornithogaster em avestruzes, ema, canário, mandarim, galinha, peru, galinha da Angola, pombo doméstico, rolinha, tucano, perdiz de chuckar e infecção experimental em galinha, codorna e camundongo

    Directory of Open Access Journals (Sweden)

    N.R.S. Martins

    2006-06-01

    Full Text Available Since 2000, Macrorhabdus ornithogaster "megabacteriosis" has been diagnosed in the avian diseases laboratory in a diversity of avian species and varied spectrum of disease. The disease in some species (chickens, turkeys, guinea fowls was clinically characterized by emaciation, prostration, loss of appetite, cachexia and death, with a typically chronic course. A more acute disease was observed in finches (canary-Serinus and zebra-Taeniopygia and budgerigars (Melopsittacus undulatus. The large rod shaped organism, visible from 100 times magnification, with and without staining, could be detected in sick and also in reasonably normal individuals of some species, such as chickens, turkeys, quails and pigeons. In rheas (Rhea americana, ostriches (Struthio camelus, canaries, zebra-finches, guinea-fowl (Numida meleagris and budgerigars. The disease was severe, causing to up to 100% mortality. The infection could be detected in some species along with other infectious or disease problems, such as endoparasites (helminths, coccidia and ectoparasitism (order Mallophaga or/and order Acarina. The cultivation of M. ornithogaster was successfully achieved in solid and liquid media, originated from chickens (four isolates, guinea fowl (1 isolate, chuckar partridge (1 isolate and canary (1 isolate. A very interesting finding at microscopy was motility of M. ornithogaster, as detected both in cultures obtained on agar for pathogenic fungi and passaged into thioglycolate broth, as well as on samples observed in wet preparations from in vivo. Differences in colony aspects were noted among the isolates. Experimental infections were attempted in chicken and japanese quail, using a chicken isolate, allowing the detection of the organism in the proventriculus and liver in apparently normal birds. One chicken isolate was injected intraperitoneally in Balb/c mice and resulted in 100% mortality.Desde 2000, diversos casos de infecção e doença por Macrorhabdus

  19. Electricity generation cost in isolated system: The complementarities of natural gas and renewables in the Canary Islands

    Energy Technology Data Exchange (ETDEWEB)

    Marrero, Gustavo A. [Facultad de Ciencias Economicas, Campus de Guajara, Universidad de La Laguna, 38071 Santa Cruz de Tenerife (Canary Islands) (Spain); Fundacion de Estudios de Economia Aplicada (FEDEA), C/Jorge Juan 46, 28001 Madrid (Spain); Ramos-Real, Francisco Javier [Facultad de Ciencias Economicas, Campus de Guajara, Universidad de La Laguna, 38071 Santa Cruz de Tenerife (Canary Islands) (Spain); Instituto Universitario de Desarrollo Regional, Facultad de Ciencias Economicas, Campus de Guajara, Universidad de La Laguna, 38071 Santa Cruz de Tenerife (Canary Islands) (Spain)

    2010-12-15

    The Canary Islands offer an example of an isolated electric grid of relative important size within the EU. Due to its peculiarities, the role of renewable energies and their complementarity with fossil fuels offers a solid path to achieving the main energy policy goals of the Islands. The purpose of this paper is to assess the current situation and the energy objectives proposed in the Energy Plan of the Canaries (PECAN, 2006) for the electricity industry, taking into account the average cost and the risk associated with the different alternatives for generating electricity by means of the Mean-Variance Portfolio Theory. Our analysis highlights the inefficiency of the current electricity generating mix in terms of cost, risk and lack of diversification. Shifting toward an efficient system would involve optimizing the use of endogenous energy sources and introducing natural gas to generate electricity. This scenario would mean reducing both cost and risk by almost 30% each, as well as atmospheric CO{sub 2} emissions. Our results agree with the PECAN philosophy. (author)

  20. Identification of a subtropical cyclone in the proximity of the Canary Islands and its analysis by numerical modeling

    Science.gov (United States)

    Quitián-Hernández, L.; Martín, M. L.; González-Alemán, J. J.; Santos-Muñoz, D.; Valero, F.

    2016-09-01

    Subtropical cyclones (STC) are low-pressure systems that share tropical and extratropical characteristics. Because of the great economic and social damage, the study of these systems has recently grown. This paper analyzes the cyclone formed in October 2014 near the Canary Islands and diagnoses such a cyclone in order to identify its correspondence to an STC category, examining its dynamical and thermal evolution. Diverse fields have been obtained from three different numerical models, and several diagnostic tools and cyclone phase space diagrams have been used. An extratropical cyclone, in its early stage, experimented a process of cut-off and isolation from the midlatitude flow. The incursion of a trough in conjunction with a low-level baroclinic zone favored the formation of the STC northwestern of the Canary Islands. Streamers of high potential vorticity linked to the cyclone favored strong winds and precipitation in the study domain. Cyclone phase space diagrams are used to complement the synoptic analysis and the satellite images of the cyclone to categorize such system. The diagrams reveal the transition from extratropical cyclone to STC remaining for several days with a subtropical structure with a quite broad action radius. The study of the mesoscale environment parameters showed an enhanced conditional instability through a deep troposphere layer. It is shown that moderate to strong vertical wind shear together with relatively warm sea surface temperature determine conditions enabling the development of long-lived convective structures.

  1. An Institutional Approach to Bordering in Islands: The Canary Islands on the African-European Migration Routes

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    Dirk Godenau

    2012-05-01

    Full Text Available Islands play a significant role in international irregular maritime migration. Frequently they are part of maritime interstitial spaces between states, and their location, combined with institutional membership, makes them part of international migration routes and subject to border management strategies. In this paper borders are analysed as social institutions used for regulating relative permeability through rules of entry and exit for persons, goods and capital. Borders institutionalize territoriality and are politically implemented by states. They are selective, also in migration, and irregular border transit is not always indicative of an inability to control. The Canary Islands are used as an illustrative example of how border management at the southern edge of the European Union has evolved towards more coercive deterrence and tighter surveillance. The Canary Islands experienced irregular maritime immigration from the west African coasts during the first decade of the 21st century and most of these migrants intended to use the islands as transit space towards the European continent. Increasing surveillance in countries of origin, enforcement of border controls and stricter return policies were used to stop flows. The so-called “cayuco crisis” in 2006 induced institutional change in border management and forced the active involvement of the EU through FRONTEX.

  2. Experience of the Canary Islands in the development of insular 100% RES systems and micro-grids

    Energy Technology Data Exchange (ETDEWEB)

    Piernavieja, Gonzalo; Suarez, Salvador; Henriquez, Daniel [Instituto Tecnologico de Canarias (Canary Islands Institute of Technology - ITC), Las Palmas, Gran Canaria (Spain). RandD Div.

    2010-07-01

    Given the mentioned circumstances, conventional energy planning in the Canary Islands is a very complex task. The Regional Energy Plan PECAN (2007-2015) tries to correct the existing critical situation setting, among others, the ambitious goal of >25% electricity from RES (mostly wind) for 2015. In parallel to this conventional energy planning, outstanding initiatives in the distributed generation field are underway. ITC vision is that the Canarian Archipelago, given its particular characteristics (insular systems of different sizes, abundant RES potential -different sources-, important natural and biodiversity heritage, etc.), are a laboratory for testing and demonstrating new energy technologies in real conditions, as well as their commercial implementation. These new technologies include energy storage (particularly for excess RES that cannot be absorbed by the grids), development of 100% energy self- sufficiency models (with exclusive use of RES) and micro-/minigrids with high RES penetration and RES forecasting, including advanced ICTs and sustainable mobility concepts (e.g. V2G technologies). Given the high conventional generation costs and the relatively low RES costs (wind electricity production cost is less than 0.03 Euro/kWh), the Canary Islands could in the short term achieve grid parity, and in this sense pioneer the change to a RES based energy system. Models tested on the islands could be exported or extrapolated to our islands, regions of developing countries and even other regions in continental Europe. (orig.)

  3. Changes in the Diffuse CO2 Emission and Relation to Seismic Activity in and around El Hierro, Canary Islands

    Science.gov (United States)

    Padrón, Eleazar; Melián, Gladys; Marrero, Rayco; Nolasco, Dácil; Barrancos, José; Padilla, Germán; Hernández, Pedro A.; Pérez, Nemesio M.

    2008-01-01

    Significant changes in the diffuse emission of carbon dioxide were recorded in a geochemical station located at El Hierro, Canary Islands, before the occurrence of several seismic events during 2004. Two precursory CO2 efflux increases started thirteen and nine days before two seismic events of magnitude 2.3 and 1.7, which took place near El Hierro Island, Canary Islands, on March 23 and April 15, reaching a maximun value of 51.1 and 46.2 g m-2 d-1, respectively, five and eight days before the two seismic events. Other similar increases started thirteen and five days before the occurrence of two seismic events of magnitude 1.3 and 1.5 which took place on October 15 and 21 respectively, reaching the maximum values four and one day before the earthquakes. These changes were not related to variations in atmospheric or soil parameters. The Material Failure Forecast Method (FFM), which analyzes the rate of precursory phenomena, was successfully applied to forecast the first seismic event that took place in El Hierro Island in 2004.

  4. La aplicación de la música tradicional canaria en las aulas: un reto didáctico para el profesorado

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    Delgado, José C.

    2005-05-01

    Full Text Available La música tradicional canaria constituye uno de los fenómenos folklóricos más interesantes en cuanto a su diversidad y calidad, y ocupa un lugar importante dentro del panorama musical del estado, no sólo por el número de cantos y bailes que ha aportado al rico y variado folklore musical español, sino también por la cantidad de investigaciones y datos que de ella se han recogido. Son numerosas las razones que justifican el uso de la música tradicional en las aulas, así como los valores que aporta la música de tradición oral y su aplicación con fines didácticos. Los contenidos canarios son esenciales a la hora de estudiar y conocer la cultura universal partiendo del entorno. La mayoría de los géneros musicales canarios nos proporcionan un caudal importante de textos, melodías y danzas que son susceptibles de ser utilizados en el aula. Sin embargo, la aplicación en el aula de la música tradicional constituye un reto para el profesorado de música que se enfrenta muchas veces a un lenguaje desconocido.

  5. Extinction of endemic vertebrates on islands : The case of the giant rat Canariomys bravoi (Mammalia, Rodentia) on Tenerife (Canary Islands, Spain)

    NARCIS (Netherlands)

    Bocherens, Herve; Michaux, Jacques; Talavera, Francisco Garcia; Van der Plicht, Johannes

    2006-01-01

    Fossil bone collagen (14)C dating and delta(13)C and delta(15)N isotopic measurements of the rodent Canariomys bravoi from Tenerife (Canary Islands.. Spain) were used to test two different hypotheses about the causes of extinctions of endemic vertebrates on islands. climate versus humans. For the Te

  6. Pre-study - mobile briquetting plant for reed canary grass in inland Northern Sweden; Foerstudie - mobil briketteringsanlaeggning foer roerflen i norrlands inland

    Energy Technology Data Exchange (ETDEWEB)

    Paulrud, Susanne; Lundmark, Bo

    2009-07-01

    The aim of this preliminary study was to summarize existing information and to develop an outline plan for a mobile briquette plant based on the conditions and requirements of reed canary grass production on forestry land. The results of the study show that there is potential to build up small-scale briquette production from reed canary grass in the areas around Arvidsjaur, Lycksele and Malaa. Important conclusions from the study are that there are potential users for reed canary grass briquettes in all three areas studied, but that profitability for mobile briquette plants is dependent on the willingness of the users to pay well for the briquettes. These briquette plants would need a relatively high degree of automation for commercial operation to be profitable. The first plant should therefore be collocated with another business so that staff, machinery (e.g. loader) and storage space can be shared with other operations. One appropriate location would be to build up activities for a mobile reed canary grass briquette plant around Glommers Miljoeenergi's pellet plant in Glommerstraesk. Thus, the plant could be used as a demonstration mobile unit, with a stationary 'home production base'CO{sub 2} Glommerstraesk

  7. Metals in Mullus surmuletus and Pseudupeneus prayensis from the Canary Islands (Atlantic Ocean).

    Science.gov (United States)

    Dorta, Paola; Rubio, Carmen; Lozano, Gonzalo; González-Weller, Dailos; Gutiérrez, Ángel; Hardisson, Arturo; Revert, Consuelo

    2015-12-01

    A total of 20 metals (Na, K, Ca, Mg, B, Ba, Co, Cr, Cu, Sr, Fe, Li, Mn, Mo, Ni, V, Zn, Al, Cd, and Pb) were analyzed by inductively coupled plasma optical emission spectrometry in muscle and liver tissue from a total of 28 examples of the fishes Mullus surmuletus and Pseudupeneus prayensis marketed in Tenerife, Canary Islands (Spain). Significant differences (P < 0.05) in B, K, Mg, Mn, and Na concentrations were found between muscle and liver. The mean concentrations of K (1,388.04 mg/kg wet weight [wet wt]) and Mg (153.33 mg/kg wet wt) were higher in muscle than in liver (697.49 and 114.21 mg/kg wet wt, respectively). The mean concentrations of B in liver (0.18 mg/kg wet wt), Mn (0.70 mg/kg wet wt), and Na (892.09 mg/kg wet wt) were higher than those in muscle (0.15, 0.11, and 375.55 mg/kg wet wt, respectively). The mean concentrations of Al, Cd, and Pb in muscle tissue were 2.72 mg/kg wet wt and 4.28 and 10.29 μg/kg wet wt, and those in liver tissue were 31.31 mg/kg wet wt and 612.91 and 232.08 μg/kg wet wt, respectively. When comparing the two fish species, the muscle tissue of M. surmuletus has significantly higher concentrations (P < 0.05) of Al, B, Ba, Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, Sr, and Zn than did P. prayensis muscle, whereas the concentrations of Cd and V were significantly higher (P < 0.05) in P. prayensis muscle. Toxicological assessment of Cd and Pb concentrations was performed using the maximum limits set by the European Commission Regulations 1881/2006 and 629/2008 for muscle tissue (50 and 300 μg/kg wet wt, respectively). The concentrations of Cd and Pb in muscle detected in the present study for all the analyzed examples of M. surmuletus and P. prayensis were lower than the maximums established for muscle tissue by European legislation. Therefore, consumption of the muscle of these fish is considered safe in terms of Al, Cd, and Pb concentrations. However, the consumption of liver tissue should be avoided because of its high levels

  8. Analysis of Ballistic Blocks and Eruption History of Montaña Colorada, Lanzarote, Canary Islands

    Science.gov (United States)

    Semple Domagall, A. M.; Kobs-Nawotniak, S. E.

    2015-12-01

    From September 1730 to April 1736, more than 30 vents formed along a ~18 km long rift on the island of Lanzarote in the Canary Islands. Little actual data of these eruptions exist with the exception of court records and the diary of a priest from Yaiza. Previous research has broken this five and a half year period into 5 major eruptive phases (Carracedo et al., 1992).Montaña Colorada - a 150 m-tall, 600 m wide cinder cone - is the final vent associated with this eruption, and likely formed in 10 km long), large spatter clasts, spatter within the cinder cone, and a minor ash blanket are associated with this vent. These are typical of the 1730-1736 vents on Lanzarote. Unique to Montaña Colorada is the presence of a solidified lava pond within the vent, and an array of large (~1-4 m diameter), dense (2800 kg/m3), basaltic blocks roughly 500-1000 m from the vent. Additionally, peridotite nodules (up to 15 cm diameter) are found both within the lava flows and the tephra: the nodules are seen only here and at the, nearby, first vent associated with the eruptions. Lava flows, possibly from a fissure vent, started the eruption at Montaña Colorada: an effusion rate of 74.9 ± 25.9 m3s-1 is estimated for the 10.6 km-long, peridotite-bearing, flow, giving an emplacement time of ~1-3 days. As the eruption rate decreased, agglutinated spatter collected closer to the vent with loose tephra distally forming the main cinder cone. Towards the end of the eruption it appears the vent was filled with a lava pond, which breached to the north. The large, dense, blocks surrounding Montaña Colorada are here suggested to be the result of a transient explosion of a previous lava pond that occupied the vent. A lack of peridotite nodules or vesicles would be consistent with basalt that had pooled within the vent for some time. Eruption velocities on the order of 70-300 ms-1 are calculated for these blocks.

  9. Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

    Directory of Open Access Journals (Sweden)

    S. Karki

    2014-09-01

    Full Text Available Cultivation of bioenergy crops in rewetted peatland (paludiculture is considered as a possible land use option to mitigate greenhouse gas (GHG emissions. However, bioenergy crops like reed canary grass (RCG can have a complex influence on GHG fluxes. Here we determined the effect of RCG cultivation on GHG emission from peatland rewetted to various extents. Mesocosms were manipulated to three different ground water levels (GWL, i.e., 0, −10 and −20 cm below the soil surface in a controlled semi-field facility. Emissions of CO2 (ecosystem respiration, ER, CH4 and N2O from mesocosms with RCG and bare soil were measured at weekly to fortnightly intervals with static chamber techniques for a period of one year. Cultivation of RCG increased both ER and CH4 emissions, but decreased the N2O emissions. The presence of RCG gave rise to 69, 75 and 85% of total ER at −20, −10 and 0 cm GWL, respectively However, this difference was due to decreased soil respiration at the rising GWL as the plant-derived CO2 flux was similar at all three GWL. For methane, 70–95% of the total emission was due to presence of RCG, with the highest contribution at −20 cm GWL. In contrast, cultivation of RCG decreased N2O emission by 33–86% with the major reductions at −10 and −20 cm GWL. In terms of global warming potential, the increase in CH4 emissions due to RCG cultivation was more than off-set by the decrease in N2O emissions at −10 and −20 cm GWL; at 0 cm GWL the CH4 emissions was offset only by 23%. CO2 emissions from ER obviously were the dominant RCG-derived GHG flux, but above-ground biomass yields, and preliminary measurements of gross photosynthetic production, show that ER could be more than balanced due to the uptake of CO2 by RCG. Our results support that RCG cultivation could be a good land use option in terms of mitigating GHG emission from rewetted peatlands, potentially turning these ecosystems into a sink of atmospheric CO2.

  10. Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting

    Science.gov (United States)

    Karki, S.; Elsgaard, L.; Lærke, P. E.

    2015-01-01

    Cultivation of bioenergy crops in rewetted peatland (paludiculture) is considered as a possible land use option to mitigate greenhouse gas (GHG) emissions. However, bioenergy crops like reed canary grass (RCG) can have a complex influence on GHG fluxes. Here we determined the effect of RCG cultivation on GHG emission from peatland rewetted to various extents. Mesocosms were manipulated to three different ground water levels (GWLs), i.e. 0, -10 and -20 cm below the soil surface in a controlled semi-field facility. Emissions of CO2 (ecosystem respiration, ER), CH4 and N2O from mesocosms with RCG and bare soil were measured at weekly to fortnightly intervals with static chamber techniques for a period of 1 year. Cultivation of RCG increased both ER and CH4 emissions, but decreased the N2O emissions. The presence of RCG gave rise to 69, 75 and 85% of total ER at -20, -10 and 0 cm GWL, respectively. However, this difference was due to decreased soil respiration at the rising GWL as the plant-derived CO2 flux was similar at all three GWLs. For methane, 70-95% of the total emission was due to presence of RCG, with the highest contribution at -20 cm GWL. In contrast, cultivation of RCG decreased N2O emission by 33-86% with the major reductions at -10 and -20 cm GWL. In terms of global warming potential, the increase in CH4 emissions due to RCG cultivation was more than offset by the decrease in N2O emissions at -10 and -20 cm GWL; at 0 cm GWL the CH4 emissions was offset only by 23%. CO2 emissions from ER were obviously the dominant RCG-derived GHG flux, but above-ground biomass yields, and preliminary measurements of gross photosynthetic production, showed that ER could be more than balanced due to the photosynthetic uptake of CO2 by RCG. Our results support that RCG cultivation could be a good land use option in terms of mitigating GHG emission from rewetted peatlands, potentially turning these ecosystems into a sink of atmospheric CO2.

  11. Energy crop cultivations of reed canary grass - An inferior breeding habitat for the skylark, a characteristic farmland bird species

    Energy Technology Data Exchange (ETDEWEB)

    Vepsaelaeinen, Ville [Finnish Museum of Natural History, P.O. Box 17, University of Helsinki, FI-00014 Helsinki (Finland)

    2010-07-15

    Here, I present the first comparison of the abundance of farmland birds in energy grass fields and in cereal-dominated conventionally cultivated fields (CCFs). I demonstrate that in boreal farmland, skylark (Alauda arvensis) densities were significantly lower in reed canary grass (RCG) (Phalaris arundinacea) fields than in CCFs. I found that during the early breeding season RCG fields and CCFs are equally good habitats, but over the ensuing couple of weeks RCG rapidly grows too tall and dense for field-nesting species. Consequently, RCG is an inferior habitat for skylark for laying replacement clutches (after failure of first nesting) or for a second clutch after one successful nesting. The results imply that if RCG cultivation is to be expanded, the establishment of large monocultures should be avoided in farmland landscapes; otherwise the novel habitat may affect detrimentally the seriously depleted skylark population, and probably also other field-nesting bird species with similar breeding habitats. (author)

  12. Geomechanical parameters of intact rocks and rock masses from the Canary Islands: Implications on their flank stability

    Science.gov (United States)

    Rodríguez-Losada, J. A.; Hernández-Gutiérrez, L. E.; Olalla, C.; Perucho, A.; Serrano, A.; Eff-Darwich, A.

    2009-05-01

    New data on the geomechanical properties of the highly cohesive volcanic rocks of the Canary Archipelago and their role in the flank stability on oceanic islands are provided in this work. On the basis of the textural and petrological features, a preliminary classification of rocks, grouped into lithotypes, was carried out. This classification includes vesicular and non vesicular basalts, trachybasalts, trachytes, phonolites, welded and non welded ignimbrites. Strength and strain-related features are summarized here for each distinctive lithotype. Taking into account the results of the uniaxial and triaxial compressive tests, the geological strength index of rock masses and their textural-structural features, an estimate of the rock mass parameters and Mohr-Coulomb fit has been carried out. A final discussion on the impact of those geomechanical parameters as factors governing the stability of steep slopes in volcanic islands is then made here as a contribution in volcanic risk.

  13. Planck Intermediate Results. XXXVI. Optical identification and redshifts of Planck SZ sources with telescopes in the Canary Islands Observatories

    CERN Document Server

    Ade, P A R; Arnaud, M; Ashdown, M; Aumont, J; Baccigalupi, C; Banday, A J; Barreiro, R B; Barrena, R; Bartolo, N; Battaner, E; Benabed, K; Benoit-Lévy, A; Bernard, J -P; Bersanelli, M; Bielewicz, P; Bikmaev, I; Böhringer, H; Bonaldi, A; Bonavera, L; Bond, J R; Borrill, J; Bouchet, F R; Burenin, R; Burigana, C; Calabrese, E; Cardoso, J -F; Catalano, A; Chamballu, A; Chary, R -R; Chiang, H C; Chon, G; Christensen, P R; Clements, D L; Colombo, L P L; Combet, C; Comis, B; Crill, B P; Curto, A; Cuttaia, F; Dahle, H; Danese, L; Davies, R D; Davis, R J; de Bernardis, P; de Rosa, A; de Zotti, G; Delabrouille, J; Diego, J M; Dole, H; Donzelli, S; Doré, O; Douspis, M; Dupac, X; Efstathiou, G; Elsner, F; Enßlin, T A; Eriksen, H K; Ferragamo, A; Finelli, F; Forni, O; Frailis, M; Fraisse, A A; Franceschi, E; Fromenteau, S; Galeotta, S; Galli, S; Ganga, K; Génova-Santos, R T; Giard, M; Gjerløw, E; González-Nuevo, J; Górski, K M; Gruppuso, A; Hansen, F K; Harrison, D L; Hempel, A; Hernández-Monteagudo, C; Herranz, D; Hildebrandt, S R; Hivon, E; Hornstrup, A; Hovest, W; Huffenberger, K M; Hurier, G; Jaffe, T R; Keihänen, E; Keskitalo, R; Khamitov, I; Kisner, T S; Knoche, J; Kunz, M; Kurki-Suonio, H; Lamarre, J -M; Lasenby, A; Lattanzi, M; Lawrence, C R; Leonardi, R; León-Tavares, J; Levrier, F; Lietzen, H; Liguori, M; Lilje, P B; Linden-Vørnle, M; López-Caniego, M; Lubin, P M; Macías-Pérez, J F; Maffei, B; Maino, D; Mandolesi, N; Maris, M; Martin, P G; Martínez-González, E; Masi, S; Matarrese, S; McGehee, P; Melchiorri, A; Mennella, A; Migliaccio, M; Miville-Deschênes, M -A; Moneti, A; Montier, L; Morgante, G; Mortlock, D; Munshi, D; Murphy, J A; Naselsky, P; Nati, F; Natoli, P; Novikov, D; Novikov, I; Oxborrow, C A; Pagano, L; Pajot, F; Paoletti, D; Pasian, F; Perdereau, O; Pettorino, V; Piacentini, F; Piat, M; Pierpaoli, E; Plaszczynski, S; Pointecouteau, E; Polenta, G; Pratt, G W; Prunet, S; Puget, J -L; Rachen, J P; Rebolo, R; Reinecke, M; Remazeilles, M; Renault, C; Renzi, A; Ristorcelli, I; Rocha, G; Rosset, C; Rossetti, M; Roudier, G; Rubiño-Martín, J A; Rusholme, B; Sandri, M; Santos, D; Savelainen, M; Savini, G; Scott, D; Stolyarov, V; Streblyanska, A; Sudiwala, R; Sunyaev, R; Suur-Uski, A -S; Sygnet, J -F; Terenzi, L; Toffolatti, L; Tomasi, M; Tramonte, D; Tristram, M; Tucci, M; Valenziano, L; Valiviita, J; Van Tent, B; Vielva, P; Villa, F; Wade, L A; Wandelt, B D; Wehus, I K; Yvon, D; Zacchei, A; Zonca, A

    2015-01-01

    We present the results of approximately three years of observations of Planck Sunyaev-Zeldovich (SZ) sources with telescopes at the Canary Islands observatories, as part of the general optical follow-up programme undertaken by the Planck collaboration. In total, 78 SZ sources are discussed. Deep imaging observations were obtained for most of those sources; spectroscopic observations in either in long-slit or multi-object modes were obtained for many. We found optical counterparts for 73 of the 78 candidates. This sample includes 53 spectroscopic redshifts determinations, 20 of them obtained with a multi-object spectroscopic mode. The sample contains new redshifts for 27 Planck clusters that were not included in the first Planck SZ source catalogue (PSZ1).

  14. Reed canary grass as energy and fiber raw material; Roerflen som energi- och fiberraavara. En system- och ekonomistudie

    Energy Technology Data Exchange (ETDEWEB)

    Olsson, Rolf; Rosenqvist, H.; Vinterbaeck, J.; Burvall, J.; Finell, M.

    2001-12-01

    In this report, a system and economic analysis is reported for cultivation of RCG for energy purpose and as a raw material for the paper industry. The interest in cultivation of Reed Canary Grass (RCG) is growing in Sweden due to the new tax on waste disposal, since sewage sludge could be recycled in RCG cultivation. Increased carbon sinks in soil is another positive factor. Plant selection work in Finland and Sweden have resulted in 20% higher harvests than the feed varieties of RCG. Silty/sandy soils give highest yields. Before investments could be made in paper industry, a production volume of about 100,000 tons/year would have to be reached, demand a cultivation area of about 40,000 ha. The initial market before this level is reached should be the energy sector, specially smaller district heating systems. Processed to pellets, briquettes or powder, RCG can substitute fuel oil.

  15. Stomoxys calcitrans as possible vector of Trypanosoma evansi among camels in an affected area of the Canary Islands, Spain

    Directory of Open Access Journals (Sweden)

    Noé Francisco Rodríguez

    2014-07-01

    Full Text Available Introduction Trypanosoma evansi was first identified in the Canary Islands in 1997, and is still present in a small area of the Archipelago. To date, the disease has exclusively affected camel herds, and has not been detected in any other animal hosts. However potential vectors of Trypanosoma evansi must be identified. Methods One Nzi trap was placed on a camel farm located in the infected area for a period of one year. Results Two thousand five hundred and five insects were trapped, of which Stomoxys calcitrans was the sole hematophagous vector captured. Conclusions Stomoxys calcitrans could be exclusively responsible for the transmission of Trypanosoma evansi among camels in the surveyed area, as other species do not seem to be infected by S. calcitrans in the presence of camels.

  16. Acanthamoeba genotypes T2, T4, and T11 in soil sources from El Hierro island, Canary Islands, Spain.

    Science.gov (United States)

    Reyes-Batlle, María; Zamora-Herrera, Jonadab; Vargas-Mesa, Alejandro; Valerón-Tejera, Marco Antonio; Wagner, Carolina; Martín-Navarro, Carmen Ma; López-Arencibia, Atteneri; Sifaoui, Ines; Martínez-Carretero, Enrique; Valladares, Basilio; Piñero, José E; Lorenzo-Morales, Jacob

    2016-08-01

    The genus Acanthamoeba includes pathogenic strains which are causative agents of keratitis and encephalitis that often may end fatal in humans and other animals. In the present study, forty soil samples were collected in the island of El Hierro, Canary Islands, Spain, and checked for the presence of Acanthamoeba. Samples were cultivated onto 2 % non-nutrient agar plates seeded with a layer of heat killed Escherichia coli. Amplification by PCR and sequencing of the DF3 region of the 18S rDNA of Acanthamoeba was carried out in order to confirm morphological identification of the amoebae. Furthermore, Acanthamoeba spp. was isolated from 47.5 % of soil samples. Moreover, genotypes T2, T4, and T11 were identified in these samples. To the best of our knowledge, this is the first study to establish genotypes T2, T4, and T11 in soil sources from El Hierro island. PMID:27075307

  17. Chemical composition and methane yield of reed canary grass as influenced by harvesting time and harvest frequency

    DEFF Research Database (Denmark)

    Kandel, Tanka Prasad; Sutaryo, Sutaryo; Møller, Henrik Bjarne;

    2013-01-01

    This study examined the influence of harvest time on biomass yield, dry matter partitioning, biochemical composition and biological methane potential of reed canary grass harvested twice a month in one-cut (OC) management. The regrowth of biomass harvested in summer was also harvested in autumn as...... a two-cut management with (TC-F) or without (TC-U) fertilization after summer harvest. The specific methane yields decreased significantly with crop maturity that ranged from 384 to 315 and from 412 to 283 NL (normal litre) (kg VS)-1 for leaf and stem, respectively. Approximately 45% more methane...... was produced by the TC-F management (5430 Nm3 ha-1) as by the OC management (3735 Nm3 ha-1). Specific methane yield was moderately correlated with the concentrations of fibre components in the biomass. Larger quantity of biogas produced at the beginning of the biogas assay from early harvested biomass...

  18. Prediction of biogas yield and its kinetics in reed canary grass using near infrared reflectance spectroscopy and chemometrics

    DEFF Research Database (Denmark)

    Kandel, Tanka Prasad; Gislum, René; Jørgensen, Uffe;

    2013-01-01

    least square (PLS) regression from NIRS spectra. The calibration models for SBY (R2 = 0.68, RPD = 1.83) and k-SBY (R2 = 0.71, RPD = 1.75) were better than the model for SMY (R2 = 0.53, RPD = 1.49). Although the PLS model for SMY was less successful, the model performance was better compared...... (SBY), specific methane yield (SMY) and kinetics of biogas yield (k-SBY) of reed canary grass (RCG) biomass. Dried and powdered RCG biomass with different level of maturity was used for biochemical composition analysis, batch assays and NIRS analysis. Calibration models were developed using partial...... to the models based on chemical composition....

  19. Occurrence of contamination by controlled substances in Euro banknotes from the Spanish archipelago of the Canary Islands.

    Science.gov (United States)

    Luzardo, Octavio P; Almeida, Maira; Zumbado, Manuel; Boada, Luis D

    2011-11-01

    The social problems of drug abuse are a matter of increasing global problem. Nowadays, international agencies need fresh methods to monitor trends of the use of illicit drugs. In this sense, small amounts of drugs are transferred to banknotes and they could be detected and quantified. An analytical procedure based upon extraction with organic solvent, liquid chromatography separation, and mass spectrometric detection allowed the identification of 21 drugs and metabolites in 120 used Euro banknotes collected in the Canary Islands (Spain). Most of the banknotes analyzed showed detectable drug residues (92.5%). Cocaine was the most frequently detected drug, present in approximately 90% of the samples. In addition, 75%, 35%, and 15% of the banknotes showed residues of amphetamine derivatives, opiates, and benzodiazepines, respectively. An average of three drug residues per banknote was detected. In summary, the presence of drug residues in banknotes could be useful as tracer for drugs prevalence. PMID:21790602

  20. International migration, transnational links and ethnic economy. The case of the Indostanic community in the Canary Islands

    Directory of Open Access Journals (Sweden)

    Ana María López Sala

    2007-10-01

    Full Text Available The Sindhi diaspora is one of the most extensive and influential of Asian commercial diasporas. Its expansion commenced in the 15th century, but it grew significantly in the second half of the 19th century and in the middle of the 20th. The aim of this article is to describe the Sindhis’ settling and commercial activity on the Canary Islands one of the establishing points of the network and to produce a critical reflection of some of the alternative guidelines for economic integration in places where, as in this case, the territory is presented as a space of opportunities for achieving economic objectives. Such an analysis must consider the make-up and dynamic of this transnational network through which information, capital, goods and people circulate.

  1. Impacto de la introducción de la abeja doméstica (Apis mellifera, Apidae en el Parque Nacional del Teide (Tenerife, Islas Canarias

    Directory of Open Access Journals (Sweden)

    A. Valido

    2014-01-01

    Full Text Available En el Parque Nacional del Teide (Tenerife, Islas Canarias se autoriza, cada primavera, la introducción de unas 3000 colmenas de abeja doméstica (Apis mellifera, Apidae. Esto implica que unos 100 millones de abejas melíferas compiten por néctar y polen con la fauna polinizadora nativa (insectos, aves y lagartos de este ecosistema peculiar de alta montaña. Si tenemos en cuenta que A. mellifera es considerada como un polinizador poco eficaz, la masiva presencia de abejas domésticas puede además incidir negativamente tanto en la producción de frutos y semillas como en la viabilidad de las semillas y el vigor de las plántulas. El objetivo de este artículo es señalar las consecuencias ecológicas de la introducción de A. mellifera en la red de interacciones mutualistas en esta área protegida (con un elevado porcentaje de especies endémicas, además de revisar el impacto de la abeja doméstica sobre la flora y fauna nativa en otros sistemas insulares. Los resultados obtenidos muestran que la diversidad de polinizadores disminuye sustancialmente tras la introducción de A. mellifera. Además, se detecta una reducción significativa en la eficacia reproductiva de aquellas plantas (Echium wildpretii, Spartocytisus supranubius frecuentemente visitadas por A. mellifera. Por todo ello, y en base a los resultados obtenidos, se recomienda eliminar completamente la presencia de colmenas en el interior del Parque Nacional del Teide con el fin de proteger su flora y fauna endémica.

  2. Influencia de la pérdida foliar sobre la cosecha en el cv. Gruesa, Musa acuminata Colla (AAA, cultivado bajo invernadero en las Islas Canarias

    Directory of Open Access Journals (Sweden)

    Juan Cabrera Cabrera

    2010-12-01

    Full Text Available El cultivo de la variedad de platanera Gruesa, selección local de Dwarf Cavendish, ha experimentado un importante aumento en los últimos años en las Islas Canarias, tanto al aire libre como bajo invernadero. La eliminación de hojas, tras la floración, es una práctica habitual en los cultivos bajo invernadero. Asimismo es frecuente la pérdida de hojas por el efecto de los vientos en los cultivos al aire libre. El objetivo de este trabajo es evaluar, mediante simulación de pérdida foliar por daños mecánicos, la influencia que tiene la disminución de superficie foliar sobre el llenado y cosecha de la fruta en dicho cultivar. Para ello, cuatro meses antes de la cosecha se efectuaron cinco niveles de defoliación: 0%, 25%, 50%, 75% y 100%. Se valoran dos métodos diferentes de defoliación, eliminación de limbo foliar y tronchado de hojas con posterior corte de éstas. Se analizan y presentan datos morfológicos, fenológicos y productivos, así como valoración de la metodología empleada en este trabajo para la simulación de daños. A partir de un 25% de defoliado, equivalente a 7.5 hojas funcionales por planta, se detectaron diferencias significativas con las plantas testigos.

  3. Geological and petrological aspects of the ongoing submarine eruption at El Hierro Island (Canary Islands, Spain)

    Science.gov (United States)

    Meletlidis, S.; Di Roberto, A.; Iribarren, I.; Pompilio, M.; Bertagnini, A.; Torres, P. A.; Felpeto, A.; Lopez, C.; Blanco, M. J.

    2012-04-01

    The Canarian Archipelago comprises seven major and three minor islands, all of them of volcanic origin. The distribution of the islands forms an east-west volcanic chain, starting about 90 km west of the northwest African continental margin. The canary volcanism is unique among ocean islands (long lifetime, multiple periods of volcanic activity, extensive range of magma compositions) and various theories were developed in order to explain that specific volcanism, with such a variety of volcanic phases and chemical diversity. El Hierro, located at the SW end of this island group, is the youngest island with the oldest subaerial rocks dated at 1.12 Ma and is still in juvenile stage of shield growth. The island is the emergent summit of a 280 km2 volcanic shield which rises from a 3800-4000m depth and grows up to 1500 m above sea level. Although the whole island has been constructed by the volcanic material of two major volcanic edifices, Tiñor in the NE (0.8 -1.2 Ma) and El Golfo edifice in the NW (550 ka-130 ka), rift volcanism (134 ka - AD1793) has been very active after the second major tectonic event (gravitational collapse of El Golfo edifice), specially along the South ridge. Till July 2011 the most recent eruption was the Volcán de Lomo Negro (AD1793) located at the western part of the island. The products of the Tiñor and El Golfo edifice, massive lava flows, are typical mafic basalts with phenocrystals of olivine and only in El Golfo sequence evolved lava flows (trachytes with phenocrystals of plagioclase feldspars) could be observed. However, the recent rift lavas present varied compositional and textural features. During the eruption of 2011-2012 a variety of volcanic material has been observed and sampled. On 15 October, bicoloured lava fragments were observed floating on the sea with a bomb-like shape and sizes between 10 and 40 cm. The outer part, black, vesiculated and no more than 1 cm thick, had a basaltic composition, while the inner part was

  4. Influence of management practices on C stabilization pathways in agricultural volcanic ash soils (Canary Islands, Spain)

    Science.gov (United States)

    Hernandez, Zulimar; María Álvarez, Ana; Carral, Pilar; de Figueiredo, Tomas; Almendros, Gonzalo

    2014-05-01

    Although C stabilization mechanisms in agricultural soils are still controversial [1], a series of overlapped pathways has been suggested [2] such as: i) insolubilization of low molecular weight precursors of soil organic matter (SOM) with reactive minerals through physical and chemical bonding, ii) selective accumulation of biosynthetic substances which are recalcitrant because of its inherent chemical composition, and iii) preservation and furter diagenetic transformation of particulate SOM entrapped within resistant microaggregates, where diffusion of soil enzymes is largely hampered. In some environments where carbohydrate and N compounds are not readily biodegraded, e.g., with water saturated micropores, an ill-known C stabilization pathway may involve the formation of Maillard's reaction products [3]. In all cases, these pathways converge in the formation of recalcitrant macromolecular substances, sharing several properties with the humic acid (HA) fraction [4]. In template forests, the selective preservation and further microbial reworking of plant biomass has been identified as a prevailing mechanism in the accumulation of recalcitrant SOM forms [5]. However, in volcanic ash soils with intense organomineral interactions, condensation reactions of low molecular weight precursors with short-range minerals may be the main mechanism [6]. In order to shed some light about the effect of agricultural management on soil C stabilization processes on volcanic ash soils, the chemical composition of HA and some structural proxies of SOM informing on its origin and potential resistance to biodegradation, were examined in 30 soils from Canary Islands (Spain) by visible, infrared (IR) and 13C nuclear magnetic resonance (NMR) spectroscopies, elementary analysis and pyrolytic techniques. The results of multivariate treatments, suggested at least three simultaneous C stabilization biogeochemical trends: i) diagenetic alteration of plant biomacromolecules in soils receiving

  5. Geochemical monitoring network at El Hierro (Canary Islands) before and during 2011 submarine eruption

    Science.gov (United States)

    Torres, P. A.; Meletlidis, S.; Luengo-Oroz, N.; Moure, D.; Rodero, C.; Villasante-Marcos, V.; Abella, R.; López, C.; Blanco, M. J.

    2012-04-01

    Since 17 July 2011 an important increase in the number of seismic events located in El Hierro (Canary Islands, Spain) was detected by the seismic network of the Instituto Geográfico Nacional (I.G.N.). This increment was interpreted as a precursory signal of a potential eruption, which in fact took place three months later (10th October 2011). In order to improve and complete the volcano monitoring network several geochemical parameters were measured since the beginning of the anomalous seismic activity. Measurements of CO2 diffuse flux through the soil were carried out in the major part of the island: the central zone, El Golfo (northern area) and the zone delimitated by the western rift. More than 450 measurements were accomplished during July, August, and September 2011. Analysis of the data revealed the existence of a spatial anomaly with relative high CO2 diffuse flux in the southwest part of the El Golfo area, close to the zone where the anomalous seismicity was located. This abnormal flux, almost aligned with the western limit of the seismic swarm, was not detected again in measurements accomplished on September in the same area. Between July and August, four geochemical stations were installed in three sub-horizontal galleries and in one well. Air and soil temperature were measured in all galleries and air 222Rn concentration was determined in the four stations. Two of the galleries were also equipped with a sensor in order to obtain measurements of CO2 concentration in the air. The sampling period for each parameter was established in ten minutes. Anomalous high 222Rn concentrations were detected in the station located in the well, apparently related to increases in the seismic accumulated energy and the GPS deformation rates. Taking into account the location of the earthquake epicentres and in order to study the evolution over the time of some physicochemical parameters of groundwater, four wells in the El Golfo area were regularly sampled since July 2011

  6. Assessing the origin of unusual organic formations in lava caves from Canary Islands (Spain)

    Science.gov (United States)

    Miller, Ana Z.; de la Rosa, Jose M.; Garcia-Sanchez, Angela M.; Pereira, Manuel F. C.; Jurado, Valme; Fernández, Octavio; Knicker, Heike; Saiz-Jimenez, Cesareo

    2016-04-01

    Lava tubes, like other caves, contain a variety of speleothems formed in the initial stage of a lava tube formation or due to leaching and subsequent precipitation of secondary minerals. Primary and secondary mineral formations in lava caves are mainly composed of silicate minerals, although secondary minerals common in limestone caves have been also reported in this type of caves. In addition, unusual colored deposits have been found on the walls and ceilings of lava tubes, some of them of unknown origin and composition. A brown to black-colored mud-like deposits was observed in "Llano de los Caños" Cave, La Palma Island, Canary Islands, Spain. These black deposits coat the wall and ceiling of the lava tube where sub-horizontal fractures occur. FESEM-EDS, X-ray micro-computed tomography and mineralogical analyses were conducted for morphological, 3D microstructural and compositional characterization of these unusual speleothem samples. These techniques revealed that they are mainly composed of amorphous materials, suggesting an organic carbon composition. Hence, analytical pyrolysis (Py-GC/MS), solid-state 13C Nuclear Magnetic Resonance (NMR) and stable isotope analysis were applied to assess the nature and origin of the black deposits. The combination of these analytical tools permits the identification of specific biomarkers (di- and triterpenoids) for tracing the potential sources of the organic compounds in the speleothems. For comparison purposes, samples from the topsoil and overlaying vegetation were also analyzed. Chromatograms resulting from the Py-GC/MS showed an abundance of polysaccharides, lipids and terpenoids typically derived from the vegetation of the area (Erica arborea). In addition, levoglucosan, polycyclic aromatic hydrocarbons and N-containing heterocyclic compounds were detected. They probably derived from the leaching of charred vegetation resulting from a wildfire occurred in the area in 2012. The lack of the typical pattern of odd

  7. Determinants of organochlorine levels detectable in the amniotic fluid of women from Tenerife Island (Canary Islands, Spain).

    Science.gov (United States)

    Luzardo, Octavio P; Mahtani, Vikesh; Troyano, Juan M; Alvarez de la Rosa, Margarita; Padilla-Pérez, Ana I; Zumbado, Manuel; Almeida, Maira; Burillo-Putze, Guillermo; Boada, Carlos; Boada, Luis D

    2009-07-01

    Organochlorines (OCs) tend to accumulate in human tissues and can be measured in amniotic fluid (AF). The detection of OCs in AF samples reflects intrauterine exposure of human beings to these persistent organic pollutants. The present study was performed to evaluate the level of contamination of AF by OCs in 100 pregnant women from Tenerife Island (Canary Islands, Spain). Gas chromatography/mass spectrometry (GC/MS) was used to identify and quantify the analytes, including 7 polychlorobiphenyl (PCB) congeners and 18 OC pesticides and metabolites. The majority of the AF samples (67%) showed some detectable OC-residue, hexachlorobenzene (HCB) being the most frequently detected compound (66% of the samples) and at the highest concentration (median 0.023 ng/ml). Lindane was also detected in 28% of the samples. Inverse associations were found between previous lactation and hexachlorocyclohexane isomers (HCH) and cyclodienes in the group of younger women (p = 0.037 and p = 0.027, respectively). Unexpectedly, serum values of HCB (r = -0.414; p = 0.04), gamma-HCH (r = -0.294; p = 0.035), and SigmaOCs (r = -0.350; p = 0.014) were negatively related to age. Even more, women with detectable levels of HCH isomers were younger (33.9 +/- 4.9 years) than women with undetectable levels of them (36.1 +/- 4.9 years; p = 0.035). We conclude that approximately one in two fetuses in the Canary Islands is exposed to OCs in utero, and that, therefore, the exposure of young women from these Islands to some HCH isomers persists nowadays. Because prenatal exposure to these chemicals may be a causative factor in adverse health trends, further studies are required to enhance preventive measures.

  8. Shallow seismic imaging of flank collapse structures in oceanic island volcanoes: Application to the Western Canary Islands

    Science.gov (United States)

    Sanchez, L.; González, P.; Tiampo, K. F.

    2013-12-01

    Volcanic flank collapse counts among the many hazards associated with volcanic activity. This type of event involves the mobilization of large volumes, producing debris avalanches. It affects mostly oceanic island volcanoes, involving the potential for tsunami occurrence. Geophysical imaging can illuminate subvolcanic features such as volcano-tectonic structures, magmatic plumbing systems or differences in rock type. The most commonly used geophysical methods are gravity, electromagnetics and seismics. In particular, seismic measurements quantify anomalies in seismic waves propagation velocities and can be used to obtain information on the subsurface arrangement of different materials. In the Western Canary Islands, the Cumbre Vieja volcano in La Palma (Canary Islands) has been proposed to be near the collapse stage. Previous geophysical studies that have been carried out on the flank of the volcano comprise gravity and electromagnetic methods. These types of surveys gather information on the deep structures of the volcano (1-2 km). In this project, we complement previous studies by using seismic methods to investigate the near-surface seismic structure of the Cumbre Vieja fault system (La Palma Island) and the structure of the well-developed San Andres fault system (El Hierro Island). We aim to compare the Cumbre Vieja and San Andres fault systems to infer the degree of maturity of collapse structures. We carried out reflection and refraction seismic surveys in order to image approximately the first 10 meters of the subsurface. We used 24 low frequency (4,5 Hz) geophones as receivers and a sledge hammer as the seismic source. The survey lines were located across visible parts of the fault systems at the Cumbre Vieja volcano and the San Andres fault in El Hierro. Here, we present the survey setup and results from the preliminary analysis of the data.

  9. Under the volcano: phylogeography and evolution of the cave-dwelling Palmorchestia hypogaea (Amphipoda, Crustacea) at La Palma (Canary Islands)

    Science.gov (United States)

    Villacorta, Carlos; Jaume, Damià; Oromí, Pedro; Juan, Carlos

    2008-01-01

    Background The amphipod crustacean Palmorchestia hypogaea occurs only in La Palma (Canary Islands) and is one of the few terrestrial amphipods in the world that have adapted to a strictly troglobitic life in volcanic cave habitats. A surface-dwelling closely related species (Palmorchestia epigaea) lives in the humid laurel forest on the same island. Previous studies have suggested that an ancestral littoral Orchestia species colonized the humid forests of La Palma and that subsequent drought episodes in the Canaries reduced the distribution of P. epigaea favouring the colonization of lava tubes through an adaptive shift. This was followed by dispersal via the hypogean crevicular system. Results P. hypogaea and P. epigaea did not form reciprocally monophyletic mitochondrial DNA clades. They showed geographically highly structured and genetically divergent populations with current gene flow limited to geographically close surface locations. Coalescence times using Bayesian estimations assuming a non-correlated relaxed clock with a normal prior distribution of the age of La Palma, together with the lack of association of habitat type with ancestral and recent haplotypes, suggest that their adaptation to cave life is relatively ancient. Conclusion The data gathered here provide evidence for multiple invasions of the volcanic cave systems that have acted as refuges. A re-evaluation of the taxonomic status of the extant species of Palmorchestia is needed, as the division of the two species by habitat and ecology is unnatural. The information obtained here, and that from previous studies on hypogean fauna, shows the importance of factors such as the uncoupling of morphological and genetic evolution, the role of climatic change and regressive evolution as key processes in leading to subterranean biodiversity. PMID:18234125

  10. Under the volcano: phylogeography and evolution of the cave-dwelling Palmorchestia hypogaea (Amphipoda, Crustacea at La Palma (Canary Islands

    Directory of Open Access Journals (Sweden)

    Oromí Pedro

    2008-01-01

    Full Text Available Abstract Background The amphipod crustacean Palmorchestia hypogaea occurs only in La Palma (Canary Islands and is one of the few terrestrial amphipods in the world that have adapted to a strictly troglobitic life in volcanic cave habitats. A surface-dwelling closely related species (Palmorchestia epigaea lives in the humid laurel forest on the same island. Previous studies have suggested that an ancestral littoral Orchestia species colonized the humid forests of La Palma and that subsequent drought episodes in the Canaries reduced the distribution of P. epigaea favouring the colonization of lava tubes through an adaptive shift. This was followed by dispersal via the hypogean crevicular system. Results P. hypogaea and P. epigaea did not form reciprocally monophyletic mitochondrial DNA clades. They showed geographically highly structured and genetically divergent populations with current gene flow limited to geographically close surface locations. Coalescence times using Bayesian estimations assuming a non-correlated relaxed clock with a normal prior distribution of the age of La Palma, together with the lack of association of habitat type with ancestral and recent haplotypes, suggest that their adaptation to cave life is relatively ancient. Conclusion The data gathered here provide evidence for multiple invasions of the volcanic cave systems that have acted as refuges. A re-evaluation of the taxonomic status of the extant species of Palmorchestia is needed, as the division of the two species by habitat and ecology is unnatural. The information obtained here, and that from previous studies on hypogean fauna, shows the importance of factors such as the uncoupling of morphological and genetic evolution, the role of climatic change and regressive evolution as key processes in leading to subterranean biodiversity.

  11. Spatio-temporal occurrence of eruptions in El Hierro (Canary Islands). Sequential steps for long-term volcanic hazard assessment.

    Science.gov (United States)

    Becerril, Laura; Bartolini, Stefania; Sobradelo, Rosa; Martí, Joan; María Morales, José; Galindo, Inés; Geyer, Adelina

    2014-05-01

    Long term volcanic hazard assessment requires the attainment of several sequential steps, including the compilation of geological and volcanological information, the characterization of past eruptions, spatial and temporal probabilistic studies, and the simulation of different eruptive scenarios to get qualitative and representative results. Volcanic hazard assessment has not been yet systematically conducted in the Canary Islands, in spite of being a densely populated active volcanic region that receives millions of visitors per year. In this paper we focus our attention on El Hierro, the youngest and latest island affected by an eruption in the Canary Islands. We analyze the past eruptive activity (how), the spatial probability (where), and the temporal probability (when) on the island. Looking at the past eruptive behavior of the island, and assuming future eruptive patterns will be similar, we try to identify the most likely set of volcanic scenarios and corresponding hazards that could occur in the future (eg. lava flows, pyroclastic fallout, and pyroclastic density currents) and estimate their probability of occurrence. The final result shows the first volcanic hazard map of the island. This study represents a step forward in the evaluation of long term volcanic hazard at El Hierro Island with regard to previous studies. The obtained results should represent the main pillars on which to build risk mitigation programs as it is required for territorial planning and to develop emergency plans. This research was partially funded by IGME, CSIC and the European Commission (FT7 Theme: ENV.2011.1.3.3-1; Grant 282759: "VUELCO"), and MINECO grant GL2011-16144-E.

  12. Evaluacion ambiental de la produccion del cultivo de tomate (Lycopersicon esculentum Mill.), bajo condiciones protegidas en Las Palmas Gran Canaria, España, mediante la utilizacion de la metodologia del analisis del ciclo de vida (acv), 2007-2009

    OpenAIRE

    De León Cifuentes, Willian Erik

    2009-01-01

    El objetivo principal de esta tesis doctoral fue realizar una evaluación ambiental, efectuando una comparación de los invernaderos tipo parral y multitúnel y de tres tipos diferentes de sustratos utilizados en la producción de tomate bajo condiciones protegidas en las Palmas Gran Canaria. Para llevar a cabo esta cuantificación se utilizó la metodología del Análisis del Ciclo de Vida (ACV). Esta tesis esta estructurada en capítulos, en el primer capítulo, aparece la introducción, objetivos, el...

  13. Estimación de la prevalencia del trastorno por déficit de atención con o sin hiperactividad (TDAH) en población escolar de la Comunidad Autónoma de Canarias

    OpenAIRE

    Juan E. Jiménez; Cristina Rodríguez; Juan Camacho; Miguel Afonso; Ceferino Artiles

    2012-01-01

    Este estudio ha tenido por finalidad determinar la prevalencia del Trastorno por Déficit de Atención con o sin Hiperactividad (TDAH) en la Comunidad Autónoma de Canarias, en la población de 6 a 12 años. Para ello, el muestreo utilizado fue polietápico estratificado y proporcional por conglomerados. Los estratos fueron el tipo de colegio, la y el nivel educativo, y los conglomerados fueron los colegios. A partir de una muestra de estudio de 118.467 alumnos escolarizados en centros ordinarios, ...

  14. El compendio de aritmética (1857) de Juan de la Puerta Canseco y la didáctica matemática en la segunda mitad del siglo XIX en las Islas Canarias

    OpenAIRE

    Martín, Juan Francisco

    2001-01-01

    La figura del profesor y escritor de manuales didácticos, Juan de La Puerta todavía es una incógnita histórica. A través del presente trabajo, su obra principal, el compendio de Aritmética (1857), recibe un tratamiento más detallado. Ello arrojará más luz sobre el `propio pensamiento de Canseco, al igual que sobre el estado de la didáctica matemática en Canarias en la segunda mitad del siglo XIX.

  15. El sistema métrico decimal en textos de matemáticas para la instrucción primaria en las Islas Canarias en el siglo XIX

    OpenAIRE

    Picado, Miguel; Rico, Luis; Gómez, Bernardo

    2013-01-01

    El artículo presenta el análisis de uno de los libros de texto de matemáticas utilizados para la enseñanza de la aritmética y el sistema métrico decimal en Canarias, a mediados del siglo XIX, en cumplimiento de la Ley de pesas y medidas de 19 de Julio de 1849. Los resultados especifican la estructura conceptual, los modos de representación y los contextos con que se presentan las nuevas unidades de pesas y medidas; las dificultades y errores en su aprendizaje; y, las tareas, secuencias y mate...

  16. Niveles, composición y origen del material particulado atmosférico en los sectores Norte y Este de la Península Ibérica y Canarias

    OpenAIRE

    Viana Rodríguez, María del Mar

    2003-01-01

    El creciente interés existente en la actualidad por la investigación en el campo del material particulado atmosférico se debe a la identificación de efectos adversos de este contaminante sobre la salud y los ecosistemas. El principal objetivo de este trabajo de investigación es evaluar los niveles, composición y origen del material particulado atmosférico en tres zonas seleccionadas de España: el País Vasco, el sector mediterráneo (Cataluña y Valencia) y Canarias. Para ello, se pretende obten...

  17. Uranium-series ages of corals, sea level history, and palaeozoogeography, Canary Islands, Spain: an exploratory study for two Quaternary interglacial periods

    Science.gov (United States)

    Muhs, Daniel R.; Meco, Joaquín; Simmons, Kathleen R.

    2014-01-01

    We present the first U-series ages of corals from emergent marine deposits on the Canary Islands. Deposits at + 20 m are 481 ± 39 ka, possibly correlative to marine isotope stage (or MIS) 11, while those at + 12 and + 8 m are 120.5 ± 0.8 ka and 130.2 ± 0.8 ka, respectively, correlative to MIS 5.5. The age, elevations, and uplift rates derived from MIS 5.5 deposits on the Canary Islands allow calculations of hypothetical palaeo-sea levels during the MIS 11 high sea stand. Estimates indicate that the MIS 11 high sea stand likely was at least + 9 m (relative to present sea level) and could have been as high as + 24 m. The most conservative estimates of palaeo-sea level during MIS 11 would require an ice mass loss equivalent to all of the modern Greenland and West Antarctic ice sheets; the more extreme estimates would require additional ice mass loss from the East Antarctic ice sheet. Extralimital southern species of mollusks, found in both MIS 11 and MIS 5.5 deposits on the Canary Islands, imply warmer-than-modern sea surface temperatures during at least a part of MIS 11 and much warmer sea surface temperatures during at least a part of MIS 5.5. Both MIS 11 and MIS 5.5 marine deposits on the Canary Islands contain extralimital northern species of mollusks as well, indicating cooler-than-present waters at times during these interglacial periods. We hypothesize that the co-occurrence of extralimital southern and northern species of marine invertebrates in the fossil record of the Canary Islands reflects its geographic location with respect to major synoptic-scale controls on climate and ocean currents. Previous interglacials may have been characterized by early, insolation-forced warming, along with northward migration of the intertropical convergence zone (ITCZ), accompanied by weakened trade winds and diminished upwelling. This allowed the arrival of extralimital southern taxa from the tropical Senegalese faunal province. During later parts of the MIS 11 and 5

  18. Plan de vigilancia y control ambiental de incidentes contaminantes en el Océano Atlántico con influencia en la zona marítima canaria con uso de simulación numérica y métodos de optimización

    OpenAIRE

    Pintado Gorordo, Clara

    2007-01-01

    [ES] El proyecto resumido en el presente artículo muestra la necesidad de implantar planes de prevención y actuación frente a incidentes contaminantes en la zona marítima canaria utilizando modelos de predicción y optimización que aseguren el éxito de aplicación de los mismos. Gracias al desarrollo de las nuevas tecnologías y avances científicos, podemos simular en tiempo real cómo evolucionará un vertido de hidrocarburo que se desplace en la zona marítima canaria. De esta manera, se optimiza...

  19. Cribado nutricional en pacientes inmovilizados del Servicio de Atención Domiciliaria de una zona básica de salud del área de Salud de Gran Canaria Nutritional screening of immobilized Home Care Service patients in a district Health Centre corresponding to the Health Area of Gran Canary

    Directory of Open Access Journals (Sweden)

    Estrella Perdomo Pérez

    2012-09-01

    Full Text Available La desnutrición es un problema grave y conlleva importantes consecuencias sociosanitarias y económicas. En pacientes inmovilizados, las úlceras por presión son una de las complicaciones más frecuentes, constituyendo una epidemia silente evitable en el mayor número de casos, donde la valoración o cribado nutricional juega un papel primordial en su prevención. La prevalencia de desnutrición cercana al 50%, observada en una muestra de 62 pacientes de un centro de salud, subrayan la necesidad de su diagnóstico precoz para poner en marcha medidas preventivas y terapéuticas que mejoren la calidad de vida de los pacientes, disminuyendo la aparición de patologías asociadas y la institucionalización/hospitalización.Undernourishment is a serious problem with important social, sanitary and economical consequences. Concerning immobilised patients, ulcers caused by pressure are the most frequent and they represent a silent epidemic which in most cases is not necessarily unavoidable because a correct nutrition screening plays a decisive role in preventing it. The alarming lack of nutrition, 50%, in a survey of 62 patients who were observed in out-patient clinics (Centros de Salud underline the necessity of an early diagnosis so as to activate prevention and therapeutical measures to improve the patients' well-being, thereby reducing possible associated pathologies and subsequential hospitalization.

  20. Topgrass. A trial of the suitability of switchgrass and reed canary grass as biofuel crops under UK conditions. 4th interim report

    Energy Technology Data Exchange (ETDEWEB)

    Riche, A.B.

    2004-04-01

    This report summarises the results of the Topgrass project growing miscanthus, switchgrass and reed canary grass at nine UK sites and covers a one year period between the winter harvesting of the plots in 2002/3 and 2003/4. Details are given of the rainfall, air temperature and solar radiation; crop monitoring for pests, diseases and weeds; crop measurements; and a comparison of all sites. Appendices present individual site diaries and individual site operations and costs.

  1. Floating stones off El Hierro, Canary Islands: xenoliths of pre-island sedimentary origin in the early products of the October 2011 eruption

    OpenAIRE

    V. R. Troll; Klügel, A.; Longpré, M.-A; Burchardt, S.; Deegan, F.M.; Carracedo, J.C; Wiesmaier, S; U. Kueppers; B. Dahren; Blythe, L. S.; Hansteen, T. H.; Freda, C.; Budd, D. A.; Jolis, E.M.; Jonsson, E.

    2012-01-01

    A submarine eruption started off the south coast of El Hierro, Canary Islands, on 10 October 2011 and continues at the time of this writing (February 2012). In the first days of the event, peculiar eruption products were found floating on the sea surface, drifting for long distances from the eruption site. These specimens, which have in the meantime been termed "restingolites" (after the close-by village of La Restinga), appeared as black volcanic "bombs" that exhibit cores of white and porou...

  2. Impact of Reed Canary Grass Cultivation and Mineral Fertilisation on the Microbial Abundance and Genetic Potential for Methane Production in Residual Peat of an Abandoned Peat Extraction Area

    Science.gov (United States)

    Espenberg, Mikk; Truu, Marika; Truu, Jaak; Maddison, Martin; Nõlvak, Hiie; Järveoja, Järvi; Mander, Ülo

    2016-01-01

    This study examined physiochemical conditions and prokaryotic community structure (the bacterial and archaeal 16S rRNA genes and mcrA gene abundances and proportions), and evaluated the effect of reed canary grass cultivation and mineral fertilisation on these factors, in the 60 cm thick residual peat layer of experimental plots located on an abandoned peat extraction area. The archaeal proportion was 0.67–39.56% in the prokaryotic community and the methanogens proportion was 0.01–1.77% in the archaeal community. When bacterial abundance was higher in the top 20 cm of peat, the archaea were more abundant in the 20–60 cm layer and methanogens in the 40–60 cm layer of the residual peat. The bacterial abundance was significantly increased, but archaeal abundance was not affected by cultivation. The fertiliser application had a slight effect on peat properties and on archaeal and methanogen abundances in the deeper layer of cultivated peat. The CH4 emission was positively related to mcrA abundance in the 20–60 cm of the bare peat, while in case of reed canary grass cultivation these two parameters were not correlated. Reed canary grass cultivation mitigated CH4 emission, although methanogen abundance remained approximately the same or even increased in different layers of residual peat under cultivated sites over time. This study supports the outlook of using abandoned peat extraction areas to produce reed canary grass for energy purposes as an advisable land-use practice from the perspective of atmospheric impact in peatland-rich Northern Europe. PMID:27684377

  3. Rhizobia from Lanzarote, the Canary Islands, That Nodulate Phaseolus vulgaris Have Characteristics in Common with Sinorhizobium meliloti Isolates from Mainland Spain▿

    OpenAIRE

    Zurdo-Piñeiro, José Luis; García-Fraile, Paula; Rivas, Raúl; Peix, Alvaro; León-Barrios, Milagros; Willems, Anne; Mateos, Pedro Francisco; Martínez-Molina, Eustoquio; Velázquez, Encarna; Van Berkum, Peter

    2009-01-01

    The stable, low-molecular-weight (LMW) RNA fractions of several rhizobial isolates of Phaseolus vulgaris grown in the soil of Lanzarote, an island of the Canary Islands, were identical to a less-common pattern found within Sinorhizobium meliloti (assigned to group II) obtained from nodules of alfalfa and alfalfa-related legumes grown in northern Spain. The P. vulgaris isolates and the group II LMW RNA S. meliloti isolates also were distinguishable in that both had two conserved inserts of 20 ...

  4. Opportunistic nectar-feeding birds are effective pollinators of bird-flowers from Canary Islands: Experimental evidence from Isoplexis canariensis (Scrophulariaceae)

    OpenAIRE

    Rodríguez-Rodríguez, María Candelaria; Valido, Alfredo

    2008-01-01

    Insular floras, characterized by simple pollination networks, sometimes include novel mutualistic agents such as nonspecialist nectarivores. In this study we confirmed the effective pollination of Isoplexis canariensis by opportunistic nectar-feeding birds in Tenerife, Canary Islands, Spain. This plant is among the ornithophilous species of the Canarian flora that lack past and present specialist nectarivorous birds. Experimental hand pollinations revealed self-compatibility, but cross-pollin...

  5. Post-fire soil hydrology, water erosion and restoration strategies in Andosols: a review of evidence from the Canary Islands (Spain)

    OpenAIRE

    Neris J; Santamarta JC; Doerr SH; Prieto F; Agulló-Pérez J; García-Villegas P

    2016-01-01

    Andosols are the most characteristic soils of volcanic regions such as the forested, fire-prone, hillslopes of the mountainous Canary Islands (Spain). Due to their volcanic nature, these soils have traditionally been considered highly resistant to water erosion processes in undisturbed conditions, but are also highly susceptible to environmental disturbances. In addition, volcanic terrains often underlie heavily-populated, steep areas where torrential rains are frequent, increasing the threat...

  6. Phenolic Constituents, Antioxidant and Preliminary Antimycoplasmic Activities of Leaf Skin and Flowers of Aloe vera (L.) Burm. f. (syn. A. barbadensis Mill.) from the Canary Islands (Spain)

    OpenAIRE

    Milagros Rico; Ramírez, Ana S; Orestes Vega-Orellana; Miguel Suárez de Tangil; Aroa López

    2013-01-01

    The methanol extracts of leaf skins and flowers of Aloe vera from the Canary Islands were analyzed for their phenolic profiles and screened for their antioxidant and antimycoplasmic activities. The use of reversed phase high performance liquid chromatography (RP-HPLC) allowed the identification of 18 phenolic constituents. Leaf skin extracts were characterized by the abundance of catechin, sinapic acid and quercitrin. Gentisic acid, epicatechin and quercitrin were the most prominent phenolic ...

  7. Análisis del efecto de la condición de “doble insularidad” sobre la equidad en la utilización de servicios sanitarios públicos: el caso de las Islas Canarias

    Directory of Open Access Journals (Sweden)

    Ignacio Abásolo Alessón

    2008-11-01

    Full Text Available El objetivo de esta investigación consiste en analizar si la condición de “doble insularidad”, es decir, de residir en una de las cinco islas pequeñas no capitalinas de Canarias, afecta a la equidad en la utilización de los distintos servicios sanitarios públicos. Con base en los datos individuales de la Encuesta de Salud de Canarias 2004 con 4.320 participantes, se estimó un modelo binomial negativo inflado de ceros (ZINB para cada uno de los cuatro servicios estudiados (servicios de medicina general, de especialista, de urgencias y hospitalizaciones, controlando por el área de residencia y también por la necesidad sanitaria y por características demográficas y socioeconómicas medidas a nivel individual. Los resultados evidencian que, en general, la condición de “doble insularidad” representa una limitación en la utilización de servicios sanitarios públicos, perjudicando a los registrados en las islas no capitalinas.

  8. Serological survey of antibodies to Toxoplasma gondii and Coxiella burnetii in rodents in north-western African islands (Canary Islands and Cape Verde).

    Science.gov (United States)

    Foronda, Pilar; Plata-Luis, Josué; del Castillo-Figueruelo, Borja; Fernández-Álvarez, Ángela; Martín-Alonso, Aarón; Feliu, Carlos; Cabral, Marilena D; Valladares, Basilio

    2015-01-01

    Coxiella burnetii and Toxoplasma gondii are intracellular parasites that cause important reproductive disorders in animals and humans worldwide, resulting in high economic losses. The aim of the present study was to analyse the possible role of peridomestic small mammals in the maintenance and transmission of C. burnetii and T. gondii in the north-western African archipelagos of the Canary Islands and Cape Verde, where these species are commonly found affecting humans and farm animals. Between 2009 and 2013, 108 black rats (Rattus rattus) and 77 mice (Mus musculus) were analysed for the presence of Coxiella and Toxoplasma antibodies by enzyme-linked immunosorbent assay (ELISA) and indirect immunofluorescence (IFA), respectively. Our results showed a wide distribution of C. burnetii and T. gondii, except for T. gondii in Cape Verde, in both rodent species. The overall seroprevalence of C. burnetii antibodies was 12.4%; 21.1% for Cape Verde and 10.2% for the Canary Islands. With respect to T. gondii, seropositive rodents were only observed in the Canary Islands, with an overall seroprevalence of 15%. Considering the fact that both pathogens can infect a large range of hosts, including livestock and humans, the results are of public health and veterinary importance and could be used by governmental entities to manage risk factors and to prevent future cases of Q fever and toxoplasmosis. PMID:26244685

  9. Effect of Additives and Fuel Blending on Emissions and Ash-Related Problems from Small-Scale Combustion of Reed Canary Grass

    Directory of Open Access Journals (Sweden)

    Sébastien Fournel

    2015-07-01

    Full Text Available Agricultural producers are interested in using biomass available on farms to substitute fossil fuels for heat production. However, energy crops like reed canary grass contain high nitrogen (N, sulfur (S, potassium (K and other ash-forming elements which lead to increased emissions of gases and particulate matter (PM and ash-related operational problems (e.g., melting during combustion. To address these problematic behaviors, reed canary grass was blended with wood (50 wt% and fuel additives (3 wt% such as aluminum silicates (sewage sludge, calcium (limestone and sulfur (lignosulfonate based additives. When burned in a top-feed pellet boiler (29 kW, the four blends resulted in a 17%–29% decrease of PM concentrations compared to pure reed canary grass probably because of a reduction of K release to flue gas. Nitrogen oxides (NOx and sulfur dioxide (SO2 emissions varied according to fuel N and S contents. This explains the lower NOx and SO2 levels obtained with wood based products and the higher SO2 generation with the grass/lignosulfonate blend. The proportion of clinkers found in combustion ash was greatly lessened (27%–98% with the use of additives, except for lignosulfonate. The positive effects of some additives may allow agricultural fuels to become viable alternatives.

  10. Serological survey of antibodies to Toxoplasma gondii and Coxiella burnetii in rodents in north-western African islands (Canary Islands and Cape Verde

    Directory of Open Access Journals (Sweden)

    Pilar Foronda

    2015-02-01

    Full Text Available Coxiella burnetii and Toxoplasma gondii are intracellular parasites that cause important reproductive disorders in animals and humans worldwide, resulting in high economic losses. The aim of the present study was to analyse the possible role of peridomestic small mammals in the maintenance and transmission of C. burnetii and T. gondii in the north-western African archipelagos of the Canary Islands and Cape Verde, where these species are commonly found affecting humans and farm animals. Between 2009 and 2013, 108 black rats (Rattus rattus and 77 mice (Mus musculus were analysed for the presence of Coxiella and Toxoplasma antibodies by enzyme-linked immunosorbent assay (ELISA and indirect immunofluorescence (IFA, respectively. Our results showed a wide distribution of C. burnetii and T. gondii, except for T. gondii in Cape Verde, in both rodent species. The overall seroprevalence of C. burnetii antibodies was 12.4%; 21.1% for Cape Verde and 10.2% for the Canary Islands. With respect to T. gondii, seropositive rodents were only observed in the Canary Islands, with an overall seroprevalence of 15%. Considering the fact that both pathogens can infect a large range of hosts, including livestock and humans, the results are of public health and veterinary importance and could be used by governmental entities to manage risk factors and to prevent future cases of Q fever and toxoplasmosis.

  11. Post-fire soil hydrology, water erosion and restoration strategies in Andosols: a review of evidence from the Canary Islands (Spain

    Directory of Open Access Journals (Sweden)

    Neris J

    2016-03-01

    Full Text Available Andosols are the most characteristic soils of volcanic regions such as the forested, fire-prone, hillslopes of the mountainous Canary Islands (Spain. Due to their volcanic nature, these soils have traditionally been considered highly resistant to water erosion processes in undisturbed conditions, but are also highly susceptible to environmental disturbances. In addition, volcanic terrains often underlie heavily-populated, steep areas where torrential rains are frequent, increasing the threat to the population and infrastructures down-slope. Numerous hydrological and erosional catastrophic events in disturbed Andosols in the Canary Islands and worldwide, leading to major losses to lives and properties, have been historically and recently reported. The impact of environmental alterations such as land use change on hydrological and erosional response of Andosols has been widely studied in the Canary Islands and worldwide. However, the effect on this soil type of wildfires, generally considered one of the main geomorphological agents, and historically connected to the forested fire-prone Andosols of the islands, has had scant attention to date. This review seeks to redress this knowledge gap by: (i evaluating the factors affecting the susceptibility of Andosols to catastrophic hydrological and erosional events; (ii summarizing the published studies on the impact of fire and the post-fire response of this soil type and the specific restoration measures developed to date; and (iii identifying research gaps and suggesting new lines of investigation in order to reduce the hydrological and erosional risks in these particular terrains.

  12. Salmonellosis and charter tourism: epidemiology and trends of imported human cases to Norway from the Canary Islands and Thailand, 1994-2008.

    Science.gov (United States)

    Emberland, K E; Nygård, K; Aavitsland, P

    2012-09-01

    More than 70% of reported human Salmonella infections in Norway are infected abroad. The Canary Islands and Thailand are two of the most popular charter tourist destinations for Norwegians. Using surveillance data for the years 1994-2008, and denominator data on travel to the Canary Islands 2000-2008 and to Thailand 1997-2008, we present the epidemiology and trends of Salmonella infections in Norwegian tourists to these destinations. We found a declining trend in risk of salmonellosis in tourists returning from the Canary Islands, and a change in serovar distribution in travellers to Thailand with more S. Enteritidis infections, similar to that observed in Western European countries. The use of denominator data is important when studying risk of travel-related disease, as surveillance data tend to reflect travel activity more than the risk. Infections among tourists do not always affect the local residents and therefore may not be detected by local public health authorities. Sharing knowledge on the epidemiology of infections in tourists could be useful for observation of changes in trends in the countries visited, and in future outbreak investigations. PMID:22051449

  13. Ancient DNA of the extinct lava shearwater (Puffinus olsoni from the Canary Islands reveals incipient differentiation within the P. puffinus complex.

    Directory of Open Access Journals (Sweden)

    Oscar Ramirez

    Full Text Available BACKGROUND: The loss of species during the Holocene was, dramatically more important on islands than on continents. Seabirds from islands are very vulnerable to human-induced alterations such as habitat destruction, hunting and exotic predators. For example, in the genus Puffinus (family Procellariidae the extinction of at least five species has been recorded during the Holocene, two of them coming from the Canary Islands. METHODOLOGY/PRINCIPAL FINDINGS: We used bones of the two extinct Canary shearwaters (P. olsoni and P. holeae to obtain genetic data, for use in providing insights into the differentiation process within the genus Puffinus. Although mitochondrial DNA (mtDNA cytochrome b sequences were successfully retrieved from four Holocene specimens of the extinct Lava shearwater (P. olsoni from Fuerteventura (Canary Islands, the P. holeae specimens yielded no DNA. Only one haplotype was detected in P. olsoni, suggesting a low genetic diversity within this species. CONCLUSIONS: The phylogenetic analyses based on the DNA data reveal that: (i the "Puffinus puffinus complex", an assemblage of species defined using osteological characteristics (P. puffinus, P. olsoni, P. mauretanicus, P. yelkouan and probably P. holeae, shows unresolved phylogenetic relationships; (ii despite the differences in body size and proportions, P. olsoni and the extant P. puffinus are sister species. Several hypotheses can be considered to explain the incipient differentiation between P. olsoni and P. puffinus.

  14. "Canary Islands, a volcanic window in the Atlantic Ocean": a 7 year effort of public awareness on volcano hazards and risk management

    Science.gov (United States)

    Rodríguez, Fátima; Calvo, David; Pérez, Nemesio M.; Padrón, Eleazar; Melián, Gladys; Padilla, Germán; Barrancos, José; Hernández, Pedro A.; Asensio-Ramos, María; Alonso, Mar

    2016-04-01

    "Canary Islands: A volcanic window in the Atlantic Ocean" is an educational program born from the need to inform and educate citizens residing in the Canary Islands on the various hazards associated to volcanic phenomena. The Canary Islands is the only territory of Spain that hosts active volcanism, as is shown by the 16 historical eruptions that have occurred throughout this territory, being the last one a submarine eruption taking place on October 12, 2011, offshore El Hierro Island. In the last 7 years, ITER as well as INVOLCAN have been performing an educative program focused on educating to the population about the benefits of a volcanic territory, volcanic hazards, how to reduce volcanic risk and the management of volcanic risk in the Canary Islands. "Canary Islands: A volcanic window in the Atlantic Ocean" consists of three units, the first two dedicated to the IAVCEI/UNESCO videos "Understanding Volcanic Hazards" and "Reducing Volcanic Risk" and the third one dedicated to the management of volcanic risk in the Canary Islands, as well as some other aspects of the volcanic phenomena. Generally the three units are shown consecutively on Tuesday, Wednesday and Thursday. This educative program has been roaming all around the 88 municipalities of the archipelago since this initiative started in 2008. The total number of attendees since then amounts to 18,911 people. The increase of assistance was constant until 2011, with annual percentages of 7.8, 17.1 and 20.9 respectively, regarding to ratio assistant/municipality. Despite the heterogeneity of the audience, the main audience is related to aged people of 45 years and older. This could be related to the memories of the recent eruptions occurred at La Palma Island in 1949 and 1971. It is important to point out that many of those people attending the educative program are representatives of local government (i.e. civil protection). Regarding the interest of the audience, the educational program attendees have

  15. Genetic study of the population of Tenerife (Canary Islands, Spain): protein markers and review of classical polymorphisms.

    Science.gov (United States)

    Moral, P; Esteban, E; Vives, S; Valveny, N; Toja, D I; Gonzalez-Reimers, E

    1997-03-01

    Data on six protein polymorphisms (19 alleles) from the human population of Tenerife are presented and discussed along with other classical markers in relation to the origin of the Canarians. Genetic influences from three population groups were considered: the Iberians, and the Berbers and non-Berbers (Arabs) from north Africa. The systems examined show the Tenerife population lies within the limits of variation described for various Iberian groups, with a slight tendency towards the characteristics of north African populations. When blood groups, red cell enzymes and serum protein data were considered, the similarity of the Canary population to Iberians seems strengthened (70% estimated contribution of Iberian peninsula genes to the present-day Canarian pool), while some relation with north African groups is shown. Genetic distances between Canarians and Arabs and Canarians and Berbers are lower than those between the two north African groups, indicating a relative and comparable contribution of each to the present-day gene pool of the Canarian population. The Arab contribution could be attributable to the slaves who were introduced to these islands after the conquest in the 15th century, while the Berber contribution could be the remnants of the extinct aboriginal peoples of the islands (Guanches) or a more recent immigration due to slavery. Genetic data do not allow us to distinguish between these two possibilities.

  16. The weed species composition in a reed canary grass (Phalaris arundinacea L. plantation for energy purposes depending on its age

    Directory of Open Access Journals (Sweden)

    Tomasz R. Sekutowski

    2014-12-01

    Full Text Available The present experiment, carried out in nine production fields of reed canary grass (Phalaris arundinacea grown for energy purposes, evaluated the effect of plantation age on the occurrence and species composition of weeds. The selected plantations were divided into 3 groups that were conventionally called “young” (1–2 years old, “middle-aged” (3–5 years old, and “older” plantations (6–8 years old. Regardless of plantation age, altogether 43 species were found in the experimental fields. Moreover, 6 species were common for all the plantations and were found in them regardless of plantation age. The least species, only 18, were found on the “young” plantations, almost twice more on the “older” ones (30 species, whereas the largest spectrum of species was found in the “middle-aged” plantations (33 species. In the “young” plantations, annual weeds were the most common, with the highest constancy and coverage index found for Chenopodium album, Matricaria maritima ssp. inodora and Echinochloa crus-galli. The greatest variation in species was found in the “middle-aged” plantations. However, only 4 species achieved the highest constancy and coverage index: Matricaria maritima ssp. inodora, Cirsium arvense, Poa trivialis and Taraxacum officinale. Furthermore, perennial weeds were found to be dominant in the “older” plantations. Within this group, Poa trivialis, Taraxacum officinale, Urtica dioica, Plantago maior, and Cirsium arvense had the highest constancy and coverage index.

  17. Aquifer Recharge Estimation through Atmospheric Chloride Mass Balance at Las Cañadas Caldera, Tenerife, Canary Islands, Spain

    Directory of Open Access Journals (Sweden)

    Rayco Marrero-Diaz

    2015-05-01

    Full Text Available The atmospheric chloride mass balance (CMB method was used to estimate net aquifer recharge in Las Cañadas Caldera, an endorheic summit aquifer area about 2000 m a.s.l. with negligible surface runoff, which hosts the largest freshwater reserve in Tenerife Island, Canary Islands, Spain. The wet hydrological year 2005–2006 was selected to compare yearly atmospheric chloride bulk deposition and average chloride content in recharge water just above the water table, both deduced from periodical sampling. The potential contribution of chloride to groundwater from endogenous HCl gas may invalidate the CMB method. The chloride-to-bromide molar ratio was an efficient tracer used to select recharge water samples having atmospheric origin of chloride. Yearly net aquifer recharge was 631 mm year−1, i.e., 69% of yearly precipitation. This result is in agreement with potential aquifer recharge estimated through an independent lumped-parameter rainfall-runoff model operated by the Insular Water Council of Tenerife. This paper illustrates basic procedures and routines to use the CMB method for aquifer recharge in active volcanic oceanic islands having sparse-data coverage and groundwater receiving contribution of endogenous halides.

  18. Epiphytic bryophytes growing on Laurus azorica (Seub.) Franco in three laurel forest areas in Tenerife (Canary Islands)

    Science.gov (United States)

    González-Mancebo, Juana M.; Romaguera, Francisco; Losada-Lima, Ana; Suárez, Andrés

    2004-05-01

    We examined bryophyte species growing on Laurus azorica, in three localities of the laurel forest in Tenerife (Canary Islands), in order to determine differences in species composition, richness and cover, that depend on variations in mist frequency and density. Among the 35 bryophyte species found (26 liverworts and nine mosses), 16 occurred in all three locations while nine species occurred in only one location. Detrended correspondence analysis and canonical correspondence analysis revealed that the epiphyte-phorophyte relationship varied in terms of cover, richness and bryophyte composition, depending on the humidity conditions (related to mist frequency and plot height) and tree age. In spite of differences in the dominant species found at each locality, the community types have many species in common and may be seen as a natural unit of the communities involved. Variation in the dominant species at each locality is mainly related to a trade off between humidity conditions and tree diameter, and the speed of the successional processes. Plot aspect was the only variable among those considered with no significant influence, which might be related to the closed canopy conditions. Variation in cover, richness and bryophyte composition related to plot height and tree diameter increased in the drier location. Cover was positively related to species richness in all analyses. This is related to low diversity during initial colonization and the fact that the highest biomass species, related to later successional stages, also occur on younger trees, especially in the more humid areas.

  19. Metallic content of wines from the Canary Islands (Spain). Application of artificial neural networks to the data analysis.

    Science.gov (United States)

    Frías, Sergio; Conde, José E; Rodríguez, Miguel A; Dohnal, Vlasta; Pérez-Trujillo, Juan P

    2002-10-01

    Eleven elements, K, Na, Ca, Mg, Fe, Cu, Zn, Mn, Sr, Li and Rb, were determined in dry and sweet wines bearing the denominations of origin of El Hierro, La Palma and Lanzarote islands (Canary Islands, Spain). Analyses were performed by flame atomic absorption spectrophotometry, with the exceptions of Li and Rb for which flame atomic emission spectrophotometry was used. The content in copper and iron did not present risks of cases. All samples presented a copper and zinc content below the maximum amount recommended by the Office International de la Vigne et du Vin (OIV) for these elements. Significant differences in the metallic content were found among the different islands. Thus, Lanzarote presented the highest mean content in sodium and lithium and the lowest mean content in rubidium, and La Palma presented the highest mean content in strontium and rubidium. Sweet wines from La Palma, elaborated as naturally sweet with over-ripe grapes, presented mean contents significantly higher with regard to dry wines from the same island in the majority of the analysed elements. Cluster analysis and Kohonen self-organising maps showed differences in wines according to the island of origin and the ripening state of the grapes. Back-propagation artificial neural networks showed better prediction ability than stepwise linear discriminant analysis. PMID:12428457

  20. Analysis of arsenic, lead and cadmium in wines from the Canary Islands, Spain, by ICP/MS.

    Science.gov (United States)

    Barbaste, M; Medina, B; Perez-Trujillo, J-P

    2003-02-01

    Because of their high toxicity, arsenic, lead and cadmium need to be quantified in food and beverages. For the first time, in this study the content of arsenic, lead and cadmium was investigated in 152 wine samples from the Canary Islands, Spain, belonging to eight Denominations of Origin (DO) and four islands by inductively coupled plasma mass spectrometry (ICP-MS). The ranges of concentration found were 0.58-8.45 microg l(-1) for arsenic, 0.20-1.73 microg l(-1) for cadmium and 3.89-159.5 microg l(-1) for lead, and the mean content was 3.13, 0.63 and 28.74 microg l(-1), respectively. None of the wines contained levels above the limits set by the International Office of Vine and Wine (OIV), and thus did not pose a health hazard. Significant differences in mean content of those elements between harvest, type of wine, islands and DO were observed. PMID:12623662

  1. First-order estimate of the Canary Islands plate-scale stress field: Implications for volcanic hazard assessment

    Science.gov (United States)

    Geyer, A.; Martí, J.; Villaseñor, A.

    2016-06-01

    In volcanic areas, the existing stress field is a key parameter controlling magma generation, location and geometry of the magmatic plumbing systems and the distribution of the resulting volcanism at surface. Therefore, knowing the stress configuration in the lithosphere at any scale (i.e. local, regional and plate-scale) is fundamental to understand the distribution of volcanism and, subsequently, to interpret volcanic unrest and potential tectonic controls of future eruptions. The objective of the present work is to provide a first-order estimate of the plate-scale tectonic stresses acting on the Canary Islands, one of the largest active intraplate volcanic regions of the World. In order to obtain the orientation of the minimum and maximum horizontal compressive stresses, we perform a series of 2D finite element models of plate scale kinematics assuming plane stress approximation. Results obtained are used to develop a regional model, which takes into account recognized archipelago-scale structural discontinuities. Maximum horizontal compressive stress directions obtained are compared with available stress, geological and geodynamic data. The methodology used may be easily applied to other active volcanic regions, where a first order approach of their plate/regional stresses can be essential information to be used as input data for volcanic hazard assessment models.

  2. Chemical fingerprinting applied to the evaluation of marine oil pollution in the coasts of Canary Islands (Spain)

    International Nuclear Information System (INIS)

    Chemical fingerprinting approach to environmental assessment is illustrated in the evaluation of marine oil pollution in the coasts using two limpet species as bioindicator organisms, and based on profiles and concentrations of n-alkanes and aromatic hydrocarbons in their tissues. Accidental and chronic releases of hydrocarbons can contaminate the marine environment of the Canary Islands not only because of their geographical situation but also because of the very dense tank traffic around. This situation affects coastal areas, fishing activities, tourism resort, etc. Concentrations of n-alkanes and aromatic hydrocarbons (polycyclic aromatic hydrocarbons and methyl-polycyclic aromatic hydrocarbons) in the soft tissues of the marine intertidal and subtidal limpets, Patella crenata and Patella ullysiponensis aspera, were evaluated. Limpet samples were collected at monthly intervals, at three locations on the southeast coast of Tenerife over a 3-year period (1991-93). Levels of hydrocarbons found in limpets are similar to concentrations found in unpolluted areas around the world. From application of principal component analysis, the interpretation of variable loading plots gives information on variable correlation and can be used to distinguish among potential sources of pollution and the ability of studied molluscs to be used as bioindicator organisms. (Author)

  3. Measurement and modelling of CO2 flux from a drained fen peatland cultivated with reed canary grass and spring barley

    DEFF Research Database (Denmark)

    Kandel, Tanka Prasad; Elsgaard, Lars; Lærke, Poul Erik

    2013-01-01

    peatland grown with reed canary grass (RCG) and spring barley (SB) in a plot experiment (n = 3 for each cropping system). The CO2flux was partitioned into gross photosynthesis (GP) and ecosystem respiration (RE). For the data analysis, simple yet useful GP and RE models were developed which introduce plot......Cultivation of bioenergy crops has been suggested as a promising option for reduction of greenhouse gas (GHG) emissions from arable organic soils (Histosols). Here, we report the annual net ecosystem exchange (NEE) fluxes of CO2 as measured with a dynamic closed chamber method at a drained fen......-scale ratio vegetation index as an active vegetation proxy. The GP model captures the effect of temperature and vegetation status, and the RE model estimates the proportion of foliar biomass dependent respiration (Rfb) in the total RE. Annual RE was 1887 ± 7 (mean ± standard error, n = 3) and 1288 ± 19 g CO2...

  4. Modeling and valuation of ecological impacts of land cover and land use changes on Tenerife (Canary Islands)

    Science.gov (United States)

    Günthert, S.; Siegmund, A.; Naumann, S.

    2010-10-01

    The island Tenerife is a popular destination for tourists, especially from European countries. From the middle of the 1970s, the mass tourism increased from about 1.3 million to 6 million tourists nowadays (2008).1 This development lead not only to an increasing expansion of infrastructure but also to a spatial concentration of settlements.2 Moreover, the Canary Islands and especially Tenerife are a hotspot of climate change with possible reorientation of atmospheric circulation. The presented research project follows the question how sensitive ecosystems (e.g. laurel forest or pinewood) on Tenerife will be affected by, on the one hand, global impacts of climate change and on the other hand by local socioeconomic effects in future. For this purpose existing time series of land cover and land use change, derived from medium spatial scaled remotely sensed data, will be upgraded with regard to the spatial and temporal resolution. Therefore an object-based classification of high spatial scaled satellite scenes has to be done followed by a change detection analysis. Taking into account the different local and global driving forces for these changes the spatial future development of the most important land use processes like e.g. increase of agricultural land (monocultures) and fallow land will then be simulated and visualised. Based on these results the impacts for different sensitive ecosystems can finally be analysed and valuated.

  5. Trends in the number of extreme hot SST days along the Canary Upwelling System due to the influence of upwelling

    Directory of Open Access Journals (Sweden)

    Xurxo Costoya

    2014-07-01

    Full Text Available Trends in the number of extreme hot days (days with SST anomalies higher than the 95% percentile were analyzed along the Canary Upwelling Ecosystem (CUE over the period 1982- 2012 by means of SST data retrieved from NOAA OI1/4 Degree. The analysis will focus on the Atlantic Iberian sector and the Moroccan sub- region where upwelling is seasonal (spring and summer are permanent, respectively. Trends were analyzed both near coast and at the adjacent ocean where the increase in the number of extreme hot days is higher. Changes are clear at annual scale with an increment of 9.8±0.3 (9.7±0.1 days dec-1 near coast and 11.6±0.2 (13.5±0.1 days dec-1 at the ocean in the Atlantic Iberian sector (Moroccan sub-region. The differences between near shore and ocean trends are especially patent for the months under intense upwelling conditions. During that upwelling season the highest differences in the excess of extreme hot days between coastal and ocean locations (Δn(#days dec-1 occur at those regions where coastal upwelling increase is high. Actually, Δn and upwelling trends have shown to be significantly correlated in both areas, R=0.88 (p<0.01 at the Atlantic Iberian sector and R=0.67 (p<0.01 at the Moroccan sub-region.

  6. New evidences on the structure of Tenerife (Canary Islands) from aeromagnetic data. Implications for the growth of ocean island volcanoes

    International Nuclear Information System (INIS)

    Complete text of publication follows. Tenerife is the largest of the Canary Islands, a volcanic archipelago located in the eastern central Atlantic. The central part of the island is occupied by a huge caldera, known as Las Canadas, inside of which the Teide-Pico Viejo stratovolcanic system developed. The highest point of the island, the Teide peak, reaches 3718 m above sea level and about 7000 m from the seafloor, which makes Tenerife the third highest ocean volcano on Earth. The interest on this island was especially renewed in 2004, when the increase of seismic activity led some volcanologists think of a possible eruption after almost a century of quiescence. In 2006 a new aeromagnetic survey of Tenerife was carried out with the aim of sampling the magnetic signature of the island with unprecedented detail. In this work we present some 3D magnetic models of Tenerife obtained from this new data set through an inverse approach especially adapted to the characteristics of volcanic environments. The shallow structure shows strong correlations with available magnetic polarity data. In addition, areas affected by giant landslides seem to be related to a characteristic magnetization pattern. The deep inner structure reveals an E-W elongated intrusive body emplaced beneath the northern half of the island as the source responsible for most of the magnetic signal of the island. These results cast new light on the inner structure of Tenerife, in particular, and on the early phases of growth of volcanic islands, in general.

  7. How to make a European integrated market in small and isolated electricity systems? The case of the Canary Islands

    Energy Technology Data Exchange (ETDEWEB)

    Perez, Yannick [Universite de Paris-Sud 11, Groupe Reseaux Jean-Monnet-ADIS, 27 Avenue Lombart Bureau C 309, 92260 Fontenay aux Roses Cedex (France); Ramos Real, Francisco Javier [Departamento de Analisis Economico e Instituto de Desarrollo Regional, Camino de La Hornera s/n, Campus de Guajara, Universidad de La Laguna, 38071 La Laguna. SC de Tenerife (Spain)

    2008-11-15

    This paper presents a geographic dimension not often studied in the dynamics of creating an internal market for electricity within the European Union, namely the case of small European electricity systems like those found on the Greek islands of Cyprus and Crete. Our question, then, is how to achieve a suitable internal market for electricity in small and isolated systems. To address this issue, we identify the main problems to be overcome by introducing a methodology in which the Canary Islands experience is taken as a case study for understanding the challenges in creating an 'EU-like market for electricity'. Our results show that the design of the vertical industrial structure and the figure of the grid operator and its attributes are key features for the proper operation of any electrical system. We also stress the minor roles of other possible options to achieve this EU-compatible market by highlighting first, in the wholesale market, the call-for-tender solution to introduce more generation and the risk of using safety requirements as barriers to entry in these small markets, and second, in the supply activities, the potential problems of an improperly regulated tariff scheme. (author)

  8. Hematozoan parasites of Rio Grande wild turkeys from southern Texas (USA)

    Science.gov (United States)

    Castle, Marc D.; Christensen, Beth A.; Rocke, Tonie E.

    1988-01-01

    One hundred twenty-three of 300 blood samples (41%) taken from Rio Grande wild turkeys (Meleagris gallopavo intermedia) from three locations in southern Texas (Welder Wildlife Refuge, Chaparrosa Ranch, and Campo Alegre Ranch) and subinoculated into domestic broad-breasted white turkey poults were positive for a Plasmodium (Novyella) sp. Analysis of blood films from 350 turkeys revealed Haemoproteus meleagridis in 76% of the birds. A significantly greater mean parasite intensity was observed in birds from Welder Wildlife Refuge. Birds from the Campo Alegre Ranch exhibited a significantly higher prevalence of H. meleagridis than birds from Chaparrosa. The Plasmodium sp. was infective for canaries (Serinus canaria), bobwhites (Colinus virginianus), and ring-necked pheasants (Phasianus colchicus), but would not produce infection in white leghorn chickens (Gallus gallus) or Coturnix quail (Coturnix coturnix). Attempts to infect Culex tarsalis and C. pipiens pipiens were unsuccessful. Asexual erythrocytic synchrony was not observed when blood-induced infections were monitored in two domestic turkey poults every 4 hr for 72 hr. Exoerythrocytic stages were not found upon examination of impression smears and tissue samples taken from brain, liver, spleen, kidney, lung, and bone marrow. The Plasmodium sp. is most similar morphologically to three species in the subgenus Novyella, P. hexamerium, P. vaughani, and P. kempi. The most striking similarities are to P. hexamerium, and involve mean merozoite number, erythrocytic schizont location, and vertebrate host susceptibility. It differs from P. vaughani in being able to infect turkeys and in type of parasitized erythrocytes. Differences to P. kempi include mean merozoite number, and ability to infect pheasants, and its inability to develop inC. pipiens and C. tarsalis.

  9. Hematozoan parasites of Rio Grande wild turkeys from southern Texas.

    Science.gov (United States)

    Castle, M D; Christensen, B M; Rocke, T E

    1988-01-01

    One hundred twenty-three of 300 blood samples (41%) taken from Rio Grande wild turkeys (Meleagris gallopavo intermedia) from three locations in southern Texas (Welder Wildlife Refuge, Chaparrosa Ranch, and Campo Alegre Ranch) and subinoculated into domestic broad-breasted white turkey poults were positive for a Plasmodium (Novyella) sp. Analysis of blood films from 350 turkeys revealed Haemoproteus meleagridis in 76% of the birds. A significantly greater mean parasite intensity was observed in birds from Welder Wildlife Refuge. Birds from the Campo Alegre Ranch exhibited a significantly higher prevalence of H. meleagridis than birds from Chaparrosa. The Plasmodium sp. was infective for canaries (Serinus canaria), bobwhites (Colinus virginianus), and ring-necked pheasants (Phasianus colchicus), but would not produce infection in white leghorn chickens (Gallus gallus) or Coturnix quail (Coturnix coturnix). Attempts to infect Culex tarsalis and C. pipiens were unsuccessful. Asexual erythrocytic synchrony was not observed when blood-induced infections were monitored in two domestic turkey poults every 4 hr for 72 hr. Exoerythrocytic stages were not found upon examination of impression smears and tissue samples taken from brain, liver, spleen, kidney, lung, and bone marrow. The Plasmodium sp. is most similar morphologically to three species in the subgenus Novyella, P. hexamerium, P. vaughani, and P. kempi. The most striking similarities are to P. hexamerium, and involve mean merozoite number, erythrocytic schizont location, and vertebrate host susceptibility. It differs from P. vaughani in being able to infect turkeys and in type of parasitized erythrocytes. Differences to P. kempi include mean merozoite number, and ability to infect pheasants, and its inability to develop in C. pipiens and C. tarsalis.

  10. Coadaptation of offspring begging and parental provisioning--an evolutionary ecological perspective on avian family life.

    Science.gov (United States)

    Estramil, Natalia; Eens, Marcel; Müller, Wendt

    2013-01-01

    Offspring begging and parental provisioning are the two central social behaviours expressed during the period of parental care. Both behaviours influence each other and it is, therefore, hypothesized that they should ultimately become (genetically) correlated, stabilized by fitness costs to parents and/or offspring. By reciprocally exchanging entire clutches in canaries (Serinus canaria), we tested (1) whether there is covariation between these behaviours and (2) whether a mismatch--as introduced by cross-fostering--entails costs. Begging was scored in a standardized begging test and parental provisioning was measured via (a) the actual feeding rate and (b) using the growth rate of the foster nestlings as a proxy. Costs were established in terms of future reproductive investment in subsequent clutches and offspring growth. We found a positive and significant phenotypic covariation between offspring begging and parental feeding when using the growth rate as a proxy and, to a lesser extent, in case of the parental feeding rate. Female parents suffered no future reproductive costs when feeding foster nestlings that were more demanding than their own nestlings. Neither growth measured amongst all offspring nor the reproductive investment measured amongst the female offspring as adults was influenced by their begging behaviour. However, the reproductive investment of female offspring tended to depend on the parental qualities of their foster parents. Thus, offspring may only be able to extract resources within the limit of generosity of their foster parents. This suggests parental control of feeding, which is also supported by the positive covariation between offspring begging and parental feeding. PMID:23894662

  11. Coadaptation of offspring begging and parental provisioning--an evolutionary ecological perspective on avian family life.

    Directory of Open Access Journals (Sweden)

    Natalia Estramil

    Full Text Available Offspring begging and parental provisioning are the two central social behaviours expressed during the period of parental care. Both behaviours influence each other and it is, therefore, hypothesized that they should ultimately become (genetically correlated, stabilized by fitness costs to parents and/or offspring. By reciprocally exchanging entire clutches in canaries (Serinus canaria, we tested (1 whether there is covariation between these behaviours and (2 whether a mismatch--as introduced by cross-fostering--entails costs. Begging was scored in a standardized begging test and parental provisioning was measured via (a the actual feeding rate and (b using the growth rate of the foster nestlings as a proxy. Costs were established in terms of future reproductive investment in subsequent clutches and offspring growth. We found a positive and significant phenotypic covariation between offspring begging and parental feeding when using the growth rate as a proxy and, to a lesser extent, in case of the parental feeding rate. Female parents suffered no future reproductive costs when feeding foster nestlings that were more demanding than their own nestlings. Neither growth measured amongst all offspring nor the reproductive investment measured amongst the female offspring as adults was influenced by their begging behaviour. However, the reproductive investment of female offspring tended to depend on the parental qualities of their foster parents. Thus, offspring may only be able to extract resources within the limit of generosity of their foster parents. This suggests parental control of feeding, which is also supported by the positive covariation between offspring begging and parental feeding.

  12. Description, molecular characterisation, diagnostics and life cycle of Plasmodium elongatum (lineage pERIRUB01), the virulent avian malaria parasite.

    Science.gov (United States)

    Palinauskas, Vaidas; Žiegytė, Rita; Iezhova, Tatjana A; Ilgūnas, Mikas; Bernotienė, Rasa; Valkiūnas, Gediminas

    2016-10-01

    Plasmodium elongatum causes severe avian malaria and is distributed worldwide. This parasite is of particular importance due to its ability to develop and cause lethal malaria not only in natural hosts, but also in non-adapted endemic birds such as the brown kiwi and different species of penguins. Information on vectors of this infection is available but is contradictory. PCR-based analysis indicated the possible existence of a cluster of closely related P. elongatum lineages which might differ in their ability to develop in certain mosquitoes and birds. This experimental study provides information about molecular and morphological characterisation of a virulent P. elongatum strain (lineage pERIRUB01) isolated from a naturally infected European robin, Erithacus rubecula. Phylogenetic analysis based on partial cytochrome b gene sequences showed that this parasite lineage is closely related to P. elongatum (lineage pGRW6). Blood stages of both parasite lineages are indistinguishable, indicating that they belong to the same species. Both pathogens develop in experimentally infected canaries, Serinus canaria, causing death of the hosts. In both these lineages, trophozoites and erythrocytic meronts develop in polychromatic erythrocytes and erythroblasts, gametocytes parasitize mature erythrocytes, exoerythrocytic stages develop in cells of the erythrocytic series in bone marrow and are occasionally reported in spleen and liver. Massive infestation of bone marrow cells is the main reason for bird mortality. We report here on syncytium-like remnants of tissue meronts, which slip out of the bone marrow into the peripheral circulation, providing evidence that the syncytia can be a template for PCR amplification. This finding contributes to better understanding positive PCR amplifications in birds when parasitemia is invisible and improved diagnostics of abortive haemosporidian infections. Sporogony of P. elongatum (pERIRUB01) completes the cycle and sporozoites develop in

  13. The immigration in Canarian press photography / La inmigración, en la fotografía de prensa de Canarias

    Directory of Open Access Journals (Sweden)

    Ddo. Alberto Ardévol Abreu - alberardevol@gmail.com

    2008-01-01

    Full Text Available In a newspaper, the way press photography contributes to discourse construction is as relevant as the text appearing next to the images. An study of the pictures about immigration in four of the most important newspapers on the Canary Islands show that media agenda focuses exclusively on some aspects of the immigration phenomenon, representing a deformed reality. Few differences among mastheads appear, associating immigration almost exclusively with the arrival of the kind of boats used by the immigrants (cayucos and pateras from the neighbouring continent. Consequently, immigrants are always portrayed as Subsaharan or Moroccan, giving priority to an homogenizing portrait and to the group, instead of looking at the individuals and their differences. While associating Africans with an image of weakness, lack of initiative and subordination, as well as crime, other much more numerous groups, such as Latin Americans, are ignored in these pictures. resumenLa fotografía de prensa colabora en la construcción del discurso periodístico de manera tan importante como los textos que la acompañan. El análisis de las fotografías de inmigración en los cuatro periódicos canarios de mayor importancia revela que la agenda mediática se centra sólo en algunos aspectos del fenómeno inmigratorio, por lo que se representa una realidad deformada. Con pocas diferencias entre cabeceras, la inmigración se asocia casi en exclusiva a la llegada de embarcaciones (cayucos y pateras del vecino continente, y el inmigrante retratado es, en consecuencia, el “subsahariano” o el marroquí, primando el retrato homogeneizador, en grupo, sobre el que busca la individualidad y la diferencia. Además de identificar a los africanos con la debilidad, la carencia de iniciativa y la subalternidad, se les asocia con el delito, a la vez que se ignora a otros colectivos, más numerosos, como los latinoamericanos.

  14. Factores determinantes de la complejidad del entorno de la empresa turística. Análisis de las percepciones durante el periodo 2001 a 2003 en Canarias

    Directory of Open Access Journals (Sweden)

    Yanes Estévez, Vanessa

    2007-01-01

    Full Text Available The tourist environment should be also analysed, apart from dynamism, considering complexity. The objective of this paper is then to analyse the existence of differences in perceiving environmental complexity during the years 2001 to 2003. The Rasch model (1960, 1980 is applied and the complexity is considered a latent variable. We used the information from a sample of decision makers of tourist firms in Canary Islands (Spain. The results confirm demand and competitors as the most complex variables. The relevant differences among years are those related to physical barriers, outer dependence and attitude towards firms

  15. Spiders on a Hot Volcanic Roof: Colonisation Pathways and Phylogeography of the Canary Islands Endemic Trap-Door Spider Titanidiops canariensis (Araneae, Idiopidae)

    Science.gov (United States)

    Opatova, Vera; Arnedo, Miquel A.

    2014-01-01

    Studies conducted on volcanic islands have greatly contributed to our current understanding of how organisms diversify. The Canary Islands archipelago, located northwest of the coast of northern Africa, harbours a large number of endemic taxa. Because of their low vagility, mygalomorph spiders are usually absent from oceanic islands. The spider Titanidiops canariensis, which inhabits the easternmost islands of the archipelago, constitutes an exception to this rule. Here, we use a multi-locus approach that combines three mitochondrial and four nuclear genes to investigate the origins and phylogeography of this remarkable trap-door spider. We provide a timeframe for the colonisation of the Canary Islands using two alternative approaches: concatenation and species tree inference in a Bayesian relaxed clock framework. Additionally, we investigate the existence of cryptic species on the islands by means of a Bayesian multi-locus species delimitation method. Our results indicate that T. canariensis colonised the Canary Islands once, most likely during the Miocene, although discrepancies between the timeframes from different approaches make the exact timing uncertain. A complex evolutionary history for the species in the archipelago is revealed, which involves two independent colonisations of Fuerteventura from the ancestral range of T. canariensis in northern Lanzarote and a possible back colonisation of southern Lanzarote. The data further corroborate a previously proposed volcanic refugium, highlighting the impact of the dynamic volcanic history of the island on the phylogeographic patterns of the endemic taxa. T. canariensis includes at least two different species, one inhabiting the Jandia peninsula and central Fuerteventura and one spanning from central Fuerteventura to Lanzarote. Our data suggest that the extant northern African Titanidiops lineages may have expanded to the region after the islands were colonised and, hence, are not the source of colonisation. In

  16. Abundance and Distribution of Sperm Whales in the Canary Islands: Can Sperm Whales in the Archipelago Sustain the Current Level of Ship-Strike Mortalities?

    Science.gov (United States)

    Fais, Andrea; Lewis, Tim P; Zitterbart, Daniel P; Álvarez, Omar; Tejedor, Ana; Aguilar Soto, Natacha

    2016-01-01

    Sperm whales are present in the Canary Islands year-round, suggesting that the archipelago is an important area for this species in the North Atlantic. However, the area experiences one of the highest reported rates of sperm whale ship-strike in the world. Here we investigate if the number of sperm whales found in the archipelago can sustain the current rate of ship-strike mortality. The results of this study may also have implications for offshore areas where concentrations of sperm whales may coincide with high densities of ship traffic, but where ship-strikes may be undocumented. The absolute abundance of sperm whales in an area of 52933 km2, covering the territorial waters of the Canary Islands, was estimated from 2668 km of acoustic line-transect survey using Distance sampling analysis. Data on sperm whale diving and acoustic behaviour, obtained from bio-logging, were used to calculate g(0) = 0.92, this is less than one because of occasional extended periods when whales do not echolocate. This resulted in an absolute abundance estimate of 224 sperm whales (95% log-normal CI 120-418) within the survey area. The recruitment capability of this number of whales, some 2.5 whales per year, is likely to be exceeded by the current ship-strike mortality rate. Furthermore, we found areas of higher whale density within the archipelago, many coincident with those previously described, suggesting that these are important habitats for females and immature animals inhabiting the archipelago. Some of these areas are crossed by active shipping lanes increasing the risk of ship-strikes. Given the philopatry in female sperm whales, replacement of impacted whales might be limited. Therefore, the application of mitigation measures to reduce the ship-strike mortality rate seems essential for the conservation of sperm whales in the Canary Islands.

  17. Integrated non-food concept of rape seed, reed canary grass and flax processing for fiber, fuel oil and solid fuel; Energiarypsi - peltojen non-food vaihtoehtoja

    Energy Technology Data Exchange (ETDEWEB)

    Sipilae, K. [VTT Energy, Espoo (Finland). Energy Production Technologies

    1995-12-31

    The target of this project is to investigate if rape seed based fuel oil and diesel fuel component, agrofiber and solid fuel from other annual crops could be produced effectively as an alternative to existing non economical biodiesel-RME and ethanol production. Without heavy tax incentives the biodiesel and grain ethanol can not compete with conventional liquid fuels, the present EU fuel tax legislation will not permit any permanent tax incentives for commercial scale operations. Based on several studies by VTT the rape seed oil will be 30 % cheaper than RME and the utilization as a component 10-30 % blended to heating oil or diesel fuel might the most flexible solution. Neste Oy has carried out the combustion tests with 20 kW boiler and VTT the diesel engine tests with 20 % unprocessed rape seed oil mixtures, the oil was delivered by Mildola Oy. For the co-utilization of annual crops and straw, several laboratory scale combustion and flash pyrolysis tests have been carried out by VTT with straw, reed canary grass etc. In a flash pyrolysis process, the alkalies will remain in the char and a low alkali level bio oils can be produced. As a final step in order to reach the zero subsidy target, an extensive laboratory work is carried out to produce agrofibre from flax, reed canary grass and wheat straw. During the next months an overall economic calculations will be carried out in Finnish, Danish and Italian conditions as an EU-Apas project in order to see the competitiveness of such integrated concepts to conventional RME and reed canary grass combustion

  18. Integrated non-food concept of rape seed, reed canary grass and flax processing for fiber, fuel oil and solid fuel

    International Nuclear Information System (INIS)

    The target of this project is to investigate if rape seed based fuel oil and diesel fuel component, agrofiber and solid fuel from other annual crops could be produced effectively as an alternative to existing non economical biodiesel-RME and ethanol production. Without heavy tax incentives the biodiesel and grain ethanol can not compete with conventional liquid fuels, the present EU fuel tax legislation will not permit any permanent tax incentives for commercial scale operations. Based on several studies by VTT the rape seed oil will be 30 % cheaper than RME and the utilization as a component 10-30 % blended to heating oil or diesel fuel might the most flexible solution. Neste Oy has carried out the combustion tests with 20 kW boiler and VTT the diesel engine tests with 20 % unprocessed rape seed oil mixtures, the oil was delivered by Mildola Oy. For the co-utilization of annual crops and straw, several laboratory scale combustion and flash pyrolysis tests have been carried out by VTT with straw, reed canary grass etc. In a flash pyrolysis process, the alkalies will remain in the char and a low alkali level bio oils can be produced. As a final step in order to reach the zero subsidy target, an extensive laboratory work is carried out to produce agrofibre from flax, reed canary grass and wheat straw. During the next months an overall economic calculations will be carried out in Finnish, Danish and Italian conditions as an EU-Apas project in order to see the competitiveness of such integrated concepts to conventional RME and reed canary grass combustion

  19. Abundance and Distribution of Sperm Whales in the Canary Islands: Can Sperm Whales in the Archipelago Sustain the Current Level of Ship-Strike Mortalities?

    Science.gov (United States)

    Fais, Andrea; Lewis, Tim P; Zitterbart, Daniel P; Álvarez, Omar; Tejedor, Ana; Aguilar Soto, Natacha

    2016-01-01

    Sperm whales are present in the Canary Islands year-round, suggesting that the archipelago is an important area for this species in the North Atlantic. However, the area experiences one of the highest reported rates of sperm whale ship-strike in the world. Here we investigate if the number of sperm whales found in the archipelago can sustain the current rate of ship-strike mortality. The results of this study may also have implications for offshore areas where concentrations of sperm whales may coincide with high densities of ship traffic, but where ship-strikes may be undocumented. The absolute abundance of sperm whales in an area of 52933 km2, covering the territorial waters of the Canary Islands, was estimated from 2668 km of acoustic line-transect survey using Distance sampling analysis. Data on sperm whale diving and acoustic behaviour, obtained from bio-logging, were used to calculate g(0) = 0.92, this is less than one because of occasional extended periods when whales do not echolocate. This resulted in an absolute abundance estimate of 224 sperm whales (95% log-normal CI 120-418) within the survey area. The recruitment capability of this number of whales, some 2.5 whales per year, is likely to be exceeded by the current ship-strike mortality rate. Furthermore, we found areas of higher whale density within the archipelago, many coincident with those previously described, suggesting that these are important habitats for females and immature animals inhabiting the archipelago. Some of these areas are crossed by active shipping lanes increasing the risk of ship-strikes. Given the philopatry in female sperm whales, replacement of impacted whales might be limited. Therefore, the application of mitigation measures to reduce the ship-strike mortality rate seems essential for the conservation of sperm whales in the Canary Islands. PMID:26999791

  20. Spiders on a Hot Volcanic Roof: Colonisation Pathways and Phylogeography of the Canary Islands Endemic Trap-Door Spider Titanidiops canariensis (Araneae, Idiopidae.

    Directory of Open Access Journals (Sweden)

    Vera Opatova

    Full Text Available Studies conducted on volcanic islands have greatly contributed to our current understanding of how organisms diversify. The Canary Islands archipelago, located northwest of the coast of northern Africa, harbours a large number of endemic taxa. Because of their low vagility, mygalomorph spiders are usually absent from oceanic islands. The spider Titanidiops canariensis, which inhabits the easternmost islands of the archipelago, constitutes an exception to this rule. Here, we use a multi-locus approach that combines three mitochondrial and four nuclear genes to investigate the origins and phylogeography of this remarkable trap-door spider. We provide a timeframe for the colonisation of the Canary Islands using two alternative approaches: concatenation and species tree inference in a Bayesian relaxed clock framework. Additionally, we investigate the existence of cryptic species on the islands by means of a Bayesian multi-locus species delimitation method. Our results indicate that T. canariensis colonised the Canary Islands once, most likely during the Miocene, although discrepancies between the timeframes from different approaches make the exact timing uncertain. A complex evolutionary history for the species in the archipelago is revealed, which involves two independent colonisations of Fuerteventura from the ancestral range of T. canariensis in northern Lanzarote and a possible back colonisation of southern Lanzarote. The data further corroborate a previously proposed volcanic refugium, highlighting the impact of the dynamic volcanic history of the island on the phylogeographic patterns of the endemic taxa. T. canariensis includes at least two different species, one inhabiting the Jandia peninsula and central Fuerteventura and one spanning from central Fuerteventura to Lanzarote. Our data suggest that the extant northern African Titanidiops lineages may have expanded to the region after the islands were colonised and, hence, are not the source

  1. A trial of the suitability of switchgrass and reed canary grass as biofuel crops under UK conditions. 5th interim report March 2005

    Energy Technology Data Exchange (ETDEWEB)

    Richie, A.B.

    2005-07-01

    The Topgrass Project, established in 2002, investigated the potential of miscanthus, switchgrass and reed canary grass as biofuel crops at various sites in the UK. This interim report covers the period from the harvesting in winter 2003/04 to the harvesting in winter 2004/05. The report gives details on (i) pest and weed control and (ii) yields and associated costs per species per unit area. It was concluded that maximum potential yield has not been reached at some sites. The study was funded by the DTI and carried out by IACR Rothamstead with ADAS Consulting, Duchy College Cornwall and SCRI Invergowrie as collaborators. The project has now terminated.

  2. Effect of chemical and physical factors on germination capacity of reed canary grass (Phalaris arundinacea L.) seed depending on storage time

    OpenAIRE

    Tomasz R. Sekutowski

    2014-01-01

    This paper presents the research results regarding the effect of temperature (-15oC) and sulfuric and gibberellic acids on germination capacity of 1-, 2- and 4-year-old seed of reed canary grass (P. arundinacea). According to the results obtained, the stimulatory and inhibitory effect of the above mentioned factors depended on seed age and the time of seed exposure. A significant increase in germination capacity under the influence of low temperature (-15oC) was recorded only for 2- and 4-yea...

  3. Floating stones off El Hierro, Canary Islands: xenoliths of pre-island sedimentary origin in the early products of the October 2011 eruption

    OpenAIRE

    Troll, V. R.; Dept. of Earth Sciences, Uppsala University, Sweden; Klugel, A.; nstitute of Geosciences, University of Bremen, Germany; Longpre, M. -A.; Dept. of Earth and Planetary Sciences, McGill University, Canada; Burchardt, S.; Dept. of Earth Sciences, Uppsala University, Sweden; Deegan, F. M.; Laboratory for Isotope Geology, Swedish Museum of Natural History, Stockholm, Sweden; Carracedo, J. C.; Dept. of Physics (Geology), GEOVOL, University of Las Palmas, Gran Canaria, Spain; Wiesmaier, S.; Dept. of Earth and Environmental Sciences, Ludwig-Maximilians Universit¨at, Munich, Germany; Kueppers, U.; Dept. of Earth and Environmental Sciences, Ludwig-Maximilians Universit¨at, Munich, Germany; Dahern, B.; Dept. of Earth Sciences, Uppsala University, Sweden; Hansteen, T. H.; Leibniz-Institute for Oceanography, IFM-GEOMAR, Kiel, Germany; Freda, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Budd, D.; Dept. of Earth Sciences, Uppsala University, Sweden; Jolis, E. M.; Dept. of Earth Sciences, Uppsala University, Sweden; Polacci, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia

    2012-01-01

    A submarine eruption started off the south coast of El Hierro, Canary Islands, on 10 October 2011 and continues at the time of this writing (February 2012). In the first days of the event, peculiar eruption products were found floating on the sea surface, drifting for long distances from the eruption site. These specimens, which have in the meantime been termed “restingolites” (after the close-by village of La Restinga), appeared as black volcanic “bombs” that exhibit cores of white ...

  4. Integrated non-food concept of rape seed, reed canary grass and flax processing for fiber, fuel oil and solid fuel

    International Nuclear Information System (INIS)

    The target of the project was to investigate if rape seed based fuel oil and diesel fuel component, agrofiber and solid fuel from other annual crops could be produced effectively as an alternative to existing non-economical biodiesel-RME and ethanol production. Without heavy tax incentives the biodiesel and grain ethanol can not compete with conventional liquid fuels, the present EU fuel tax legislation will not permit any permanent tax incentives for commercial scale operations. Based on several studies by VTT the rape seed oil will be 30 % cheaper than RME and the utilization as a component 10-30 % blended to heating oil or diesel fuel might the most flexible solution. Neste Oy has carried out the combustion tests with 20 kW boiler and VTT the diesel engine tests with 20 % unprocessed rape seed oil mixtures, the oil was delivered by Mildola Oy. For the co-utilization of annual crops and straw, several laboratory scale combustion and flash pyrolysis tests have been carried out by VTT with straw, reed canary grass etc. In fluid bed combustion 10-30 % addition of rape seed straw and reed canary grass, which have high ash melting point, seems to be less problematic compared to other straw species, which are used for example in Denmark. In a flash pyrolysis process, the alkalies will remain in the char and a low alkali level bio oils can be produced. As a final step in order to reach the zero subsidy target, an extensive laboratory work is carried out to produce agro fibre from flax, reed canary grass and wheat straw. The laboratory results show that a good quality pulp can be produced to be mixed with conventional wood fibres, the quality of flax pulp is even better compared to conventional pulp. During the next months an overall economic calculations will be carried out in Finnish, Danish and Italian conditions as an EU-Apas project in order to see the competitiveness of such integrated concepts to conventional RME and reed canary grass combustion. (orig.)

  5. Integrated non-food concept of rape seed, reed canary grass and flax processing for fiber, fuel oil and solid fuel; Energiarypsi - peltojen non-food vaihtoehtoja

    Energy Technology Data Exchange (ETDEWEB)

    Sipilae, K. [VTT Energy, Espoo (Finland)

    1998-12-31

    The target of the project was to investigate if rape seed based fuel oil and diesel fuel component, agrofiber and solid fuel from other annual crops could be produced effectively as an alternative to existing non-economical biodiesel-RME and ethanol production. Without heavy tax incentives the biodiesel and grain ethanol can not compete with conventional liquid fuels, the present EU fuel tax legislation will not permit any permanent tax incentives for commercial scale operations. Based on several studies by VTT the rape seed oil will be 30 % cheaper than RME and the utilization as a component 10-30 % blended to heating oil or diesel fuel might the most flexible solution. Neste Oy has carried out the combustion tests with 20 kW boiler and VTT the diesel engine tests with 20 % unprocessed rape seed oil mixtures, the oil was delivered by Mildola Oy. For the co-utilization of annual crops and straw, several laboratory scale combustion and flash pyrolysis tests have been carried out by VTT with straw, reed canary grass etc. In fluid bed combustion 10-30 % addition of rape seed straw and reed canary grass, which have high ash melting point, seems to be less problematic compared to other straw species, which are used for example in Denmark. In a flash pyrolysis process, the alkalies will remain in the char and a low alkali level bio oils can be produced. As a final step in order to reach the zero subsidy target, an extensive laboratory work is carried out to produce agro fibre from flax, reed canary grass and wheat straw. The laboratory results show that a good quality pulp can be produced to be mixed with conventional wood fibres, the quality of flax pulp is even better compared to conventional pulp. During the next months an overall economic calculations will be carried out in Finnish, Danish and Italian conditions as an EU-Apas project in order to see the competitiveness of such integrated concepts to conventional RME and reed canary grass combustion. (orig.)

  6. Post-fire soil erosion on vineyards and canary pine-stands on the subtropical island of La Palma: scope of application of TLS?

    Science.gov (United States)

    Umstaedter, Kathrin; Haas, Florian; Becht, Michael

    2013-04-01

    Land use is considered as a main factor regarding post-fire soil erosion. Especially in the subtropical climate with extreme rainfall events in winter and drought periods during summer times, soil erosion can clearly exceed the soil reproduction rate. On the Canary Island of La Palma frequent wildfires and steep slopes contribute to a high likelihood of post-fire soil erosion. For a quantitative measurement of the erosion rate a terrestrial Laser Scanner with high resolution in combination with a dGPS is used. The main target of this study is to quantify the post-fire soil erosion rates on study sites with a different land use on the island of La Palma (Canary Islands). The investigation focuses on two land use forms; both are very common and widespread on the island: canary pine stands and vineyard areas. The study sites are characterized by a varying steepness, a different fire history (wildfires in 2000, 2009 and 2012) and different stages of soil development. Both denudation and gully erosion processes are spread over the sites. Intense precipitation events can trigger debris flows and extensive soil erosion on post-fire sites, like in the year 2009 in the south or in 2012 on the west and east side of La Palma. Regarding that, erosion is not just a problem for agriculture, but for the infrastructure. For our project we assume, that different topography, different land use and different forest fire history can result in a different soil erosion rate and type (gully incision, denudation processes). To calculate the post-fire erosion rates of the two land use forms, 24 study sites - 10 sites in vineyard areas, 14 in canary pines stands - were selected. By means of a 3D terrestrial Laser Scanner (Riegl LMS Z420i), high resolution digital terrain models of the study sites were compiled. The data acquisition was carried out in October 2011, May 2012 and December 2012 and subsequently the terrain models were compared. With this method not only erosion rates can be

  7. A PHOTO-IDENTIFICATION CATALOGUE OF BOTTLENOSE DOLPHIN (TURSIOPS TRUNCATUS) IN THE CANARY ISLANDS, SPAIN: A BASELINE INFORMATION FOR ITS CONSERVATION

    OpenAIRE

    Verme, Valeria; Iannacone, José

    2011-01-01

    A catalog of photo-identification of bottlenose dolphin (Tursiops truncatus) was made on the island Tenerife, Canary Islands, Spain, between 2005 and 2006. A total of 391 sightings was made. Sightings took place on 95 days in 2005 and on 66 days in 2006, with a total of 70.1 h of interaction with dolphins. 129 individual adult dolphins were identified between 2005 and 2006. The frequency of re-sightings was not very high, with the most common being a dolphin resighted between 2...

  8. Retrieval and validation of carbon dioxide, methane and water vapor for the Canary Islands IR-laser occultation experiment

    Directory of Open Access Journals (Sweden)

    V. Proschek

    2014-11-01

    Full Text Available The first ground-based experiment to prove the concept of a novel space-based observation technique for microwave and infrared-laser occultation between Low Earth Orbit satellites (LMIO was performed in the Canary Islands between La Palma and Tenerife in July 2011. This experiment aimed to demonstrate the infrared-laser differential transmission principle for the measurement of greenhouse gases (GHGs in the free atmosphere. Such global and long-term stable measurements of GHGs, accompanied also by measurements of thermodynamic parameters and line-of-sight wind in a self-calibrating way, have become very important for climate change monitoring. The experiment delivered promising initial data for demonstrating the new observation concept by retrieving volume mixing ratios of GHGs along a ~ 144 km signal path at altitudes of ~ 2.4 km. Here, we present a detailed analysis of the measurements, following a recent publication that introduced the experiment's technical setup and first results for an example retrieval of CO2. We present the observational and validation datasets, the latter simultaneously measured at the transmitter and receiver sites, the measurement data handling, and the differential transmission retrieval procedure. We also determine the individual and combined uncertainties influencing the results and present the retrieval results for 12CO2, 13CO2, C18OO, H2O and CH4. The new method is found to have a reliable basis for monitoring of greenhouse gases such as CO2, CH4, and H2O in the free atmosphere.

  9. Carbon dioxide and helium dissolved gases in groundwater at central Tenerife Island, Canary Islands: chemical and isotopic characterization

    Science.gov (United States)

    Marrero-Diaz, Rayco; López, Dina; Perez, Nemesio M.; Custodio, Emilio; Sumino, Hirochika; Melián, Gladys V.; Padrón, Eleazar; Hernandez, Pedro A.; Calvo, David; Barrancos, José; Padilla, Germán; Sortino, Francesco

    2015-10-01

    Seismic-volcanic unrest was detected between 2004 and 2005 in the central and northwest zones of Tenerife Island (Canary Islands, Spain). With the aim of strengthening the program of geochemical and seismic-volcanic surveillance, a study of the origin, characteristics, and spatial distribution of dissolved carbon dioxide (CO2) and helium (He) gases in the volcanic aquifer of central Tenerife Island and around Teide volcano was carried out. This work also improves the hydrogeological and hydrogeochemical conceptual model of groundwater flow. Dissolved CO2 concentrations in sampled groundwater are several orders of magnitude higher than that of air-saturated water (ASW) suggesting a significant contribution of non-atmospheric CO2, mainly magmatic, confirmed through measurement of isotopic compositions (δ13CTDIC) and total dissolved inorganic carbon (TDIC) concentrations. A vertical stratification of dissolved CO2 and δ13CTDIC values was observed in the volcanic aquifer at the eastern region of Las Cañadas Caldera. Stratification seems to be controlled by both degree of magmatic CO2-water interaction and CO2 degassing and the original δ13Cco2(g) isotopic composition. The highest dissolved helium (4He) concentrations in groundwater seem to be related to radiogenic contributions resulting from water-rock interactions, and increase with residence time, instead of with endogenous magmatic inputs. Isotopic systematics show that the dissolved gases in groundwater of central Tenerife are variable mixtures of CO2-3He-rich fluids of volcanic-hydrothermal origin with both organic and atmospheric components. The results suggest that the eastern area of Las Cañadas Caldera, the South Volcanic Ridge, and the Teide summit cone are the areas most affected by degassing of the volcanic-hydrothermal system, and they are therefore the most suitable zones for future geochemical monitoring.

  10. Topography of upper mantle seismic discontinuities beneath the North Atlantic: the Azores, Canary and Cape Verde plumes

    Science.gov (United States)

    Saki, Morvarid; Thomas, Christine; Nippress, Stuart E. J.; Lessing, Stephan

    2015-04-01

    We are mapping the topography of upper mantle seismic discontinuities beneath the North Atlantic and surrounding regions by using precursor arrivals to PP and SS seismic waves that reflect off the seismic discontinuities. Many source-receiver combinations have been used in order to collect a large dataset of reflection points beneath our investigating area. We analyzed over 1700 seismograms from MW>5.8 events using array seismic methods to enhance the signal to noise ratio. The measured time lag between PP (SS) arrivals and their corresponding precursors on robust stacks are used to measure the depth of the transition zone boundaries. The reflectors' depths show a correlation between the location of hotspots and a significantly depressed 410 km discontinuity indicating a temperature increase of 200-300 K compared to the surrounding mantle. For the 660 km discontinuity three distinct behaviours are visible: i) normal depths beneath Greenland and at a distance of a few hundred kilometres away from the hotspots and ii) shallower 660 km discontinuity compared with the global average value near hotspots closer to the Mid-Atlantic Ridge and iii) very few observations of a 660 km discontinuity at the hotspot locations. We interpret our observations as a large upwelling beneath the southern parts of our study region, possibly due to the South Atlantic convection cell. The thermal anomaly may be blocked by endothermic phase transformation and likely does not extend through the top of the transition zone as whole except for those branches which appear as the Azores, Canaries and Cape Verde hotspots at the surface.

  11. Life-cycle assessment of a reed canary grass plantation in an abandoned peat extraction area to mitigate GHG emission

    Science.gov (United States)

    Mander, Ülo

    2013-04-01

    Abandoned peat extraction areas are continuous emitters of greenhouse gases (GHG); hence, abandonment of peat extraction areas should immediately be followed by conversion to an appropriate after-use. Our primary aim was to clarify the atmospheric impact of reed canary grass (RCG, Phalaris arundinacea L.) cultivation on an abandoned peat extraction area and to compare it to other after-treatment alternatives. In addition to measurement of GHGs using the closed chamber and gas-chromatograph method, measuring C and N balance in study plots and aboveground and belowground biomass of RCG for the period April 2009-September 2011, we performed a life-cycle assessment for five different after-use options for a drained organic soil withdrawn from peat extraction: (I) bare peat soil (no management), (II) non-fertilised Phalaris cultivation, (III) fertilized Phalaris cultivation, (IV) afforestation, and (V) rewetting. Our results showed that on average the non-fertilised and fertilised Phalaris alternatives had a cooling effect on the atmosphere, whereas afforestation, rewetting, and no management alternatives contributed to global warming. The main components influencing the global warming potential of different after-use alternatives were site GHG emissions, carbon assimilation by plants, and emissions from combustion, while management-related emissions played a relatively minor role. The results of this study indicate that, from the perspective of atmospheric impact during following 10 years, the most suitable after-use option for an abandoned peat extraction area is cultivation of RCG. For the long term effect, dynamics of Phalaris production and carbon sequestration in soil must be taken into the consideration.

  12. Retrieval and validation of carbon dioxide, methane and water vapor for the Canary Islands IR-laser occultation experiment

    Science.gov (United States)

    Proschek, V.; Kirchengast, G.; Schweitzer, S.; Brooke, J. S. A.; Bernath, P. F.; Thomas, C. B.; Wang, J.-G.; Tereszchuk, K. A.; González Abad, G.; Hargreaves, R. J.; Beale, C. A.; Harrison, J. J.; Martin, P. A.; Kasyutich, V. L.; Gerbig, C.; Loescher, A.

    2015-08-01

    The first ground-based experiment to prove the concept of a novel space-based observation technique for microwave and infrared-laser occultation between low-Earth-orbit satellites was performed in the Canary Islands between La Palma and Tenerife. For two nights from 21 to 22 July 2011 the experiment delivered the infrared-laser differential transmission principle for the measurement of greenhouse gases (GHGs) in the free atmosphere. Such global and long-term stable measurements of GHGs, accompanied also by measurements of thermodynamic parameters and line-of-sight wind in a self-calibrating way, have become very important for climate change monitoring. The experiment delivered promising initial data for demonstrating the new observation concept by retrieving volume mixing ratios of GHGs along a ~144 km signal path at altitudes of ~2.4 km. Here, we present a detailed analysis of the measurements, following a recent publication that introduced the experiment's technical setup and first results for an example retrieval of CO2. We present the observational and validation data sets, the latter simultaneously measured at the transmitter and receiver sites; the measurement data handling; and the differential transmission retrieval procedure. We also determine the individual and combined uncertainties influencing the results and present the retrieval results for 12CO2, 13CO2, C18OO, H2O and CH4. The new method is found to have a reliable basis for monitoring of greenhouse gases such as CO2, CH4, and H2O in the free atmosphere.

  13. Photophysiological variability and its influence on primary production in the NW Africa-Canary Islands coastal transition zone

    Science.gov (United States)

    Figueiras, F. G.; Arbones, B.; Montero, M. F.; Barton, E. D.; Arístegui, J.

    2016-05-01

    Photophysiological variability and its influence on primary production were studied in the NW Africa-Canary Islands coastal transition zone. The region showed strong mesoscale activity, in which upwelling filaments and island eddies interacted to cause significant vertical displacements of the deep chlorophyll maximum (DCM). Oligotrophic stations both in the open ocean and within anticyclonic eddies were characterised by low values of integrated chlorophyll (33 ± 4 mg chl a m- 2) and dominance of pico- and nanophytoplankton, while stations associated with filaments and cyclonic eddies showed moderate chl a values (50 ± 17 mg m- 2). Shelf stations affected by upwelling exhibited the highest chl a (112 ± 36 mg m- 2) with microphytoplankton dominance. Photosynthetic variables in the three groups of stations showed similar depth gradients, with maximum photosynthetic rates (PmB) decreasing with depth and maximum quantum yields (ϕm) increasing with depth. However, the increase with depth of ϕm was not so evident in shelf waters where nutrients were not depleted at the surface. Primary production (PP) displayed a coast-ocean gradient similar to that of chl a, with highest values (2.5 ± 1.2 g C m- 2 d- 1) at the eutrophic shelf stations and lowest (0.36 ± 0.11 g C m- 2 d- 1) at the oligotrophic stations. Nevertheless, integrated PP at the oligotrophic stations was not related to integrated chl a concentration but was positively (r = 0.95) correlated to carbon fixation at the DCM and negatively (r = - 0.85) correlated to the depth of the DCM, suggesting that light, and not phytoplankton biomass, was the main factor controlling PP in oligotrophic environments. It is concluded that downward displacements of the DCM, either by convergence fronts or downwelling at the core of anticyclones can significantly reduce PP in the oligotrophic ocean.

  14. Mercury and selenium status of bottlenose dolphins (Tursiops truncatus): A study in stranded animals on the Canary Islands.

    Science.gov (United States)

    García-Alvarez, Natalia; Fernández, Antonio; Boada, Luis D; Zumbado, Manuel; Zaccaroni, Annalisa; Arbelo, Manuel; Sierra, Eva; Almunia, Javier; Luzardo, Octavio P

    2015-12-01

    The mercury (Hg) level in the marine environment has tripled in recent decades, becoming a great concern because of its high toxic potential. This study reports Hg and selenium (Se) status, and the first Se/Hg molar ratio assessment in bottlenose dolphins (Tursiops truncatus) inhabiting the waters of the Canary Islands. Total Hg and Se concentrations were determined in the blubber and liver collected from 30 specimens stranded along the coasts of the archipelago from 1997 to 2013. The median values for total Hg in the blubber and liver were 80.83 and 223.77 μg g(-1) dry weight (dw), and the median levels for Se in both tissues were 7.29 and 68.63 μg g(-1) dw, respectively. Hg concentrations in the liver were lower than 100 μg g(-1) wet weight (ww), comparable to those obtained in bottlenose dolphins from the North Sea, the Western Atlantic Ocean and several locations in the Pacific Ocean. The Mediterranean Sea and South of Australia are the most contaminated areas for both elements in this cetacean species. In addition, it must be stressed that the levels of Hg and Se in the liver showed an increasing trend with the age of the animals. As expected, a strong positive correlation between Hg and Se was observed (rs=0.960). Surprisingly, both younger and older specimens had a Se/Hg molar ratio different from 1, suggesting that these individuals may be at greater toxicological risk for high concentrations of both elements or a deficiency of Se without a protective action against Hg toxicity. PMID:26232758

  15. Groundwater flow in a relatively old oceanic volcanic island: the Betancuria area, Fuerteventura Island, Canary Islands, Spain.

    Science.gov (United States)

    Herrera, Christian; Custodio, Emilio

    2014-10-15

    The island of Fuerteventura is the oldest of the Canary Islands' volcanic archipelago. It is constituted by volcanic submarine and subaerial activity and intrusive Miocene events, with some residual later volcanism and Quaternary volcanic deposits that have favored groundwater recharge. The climate is arid, with an average rainfall that barely attains 60 mm/year in the coast and up to 200 mm/year in the highlands. The aquifer recharge is small but significant; it is brackish due to large airborne atmospheric salinity, between 7 and 15 gm(-2)year(-1) of chloride deposition, and high evapo-concentration in the soil. The average recharge is estimated to be less than about 5 mm/year at low altitude and up to 10 mm/year in the highlands, and up to 20 mm/year associated to recent lava fields. Hydrochemical and water isotopic studies, supported by water table data and well and borehole descriptions, contribute a preliminary conceptual model of groundwater flow and water origin in the Betancuria area, the central area of the island. In general, water from springs and shallow wells tends to be naturally brackish and of recent origin. Deep saline groundwater is found and is explained as remnants of very old marine water trapped in isolated features in the very low permeability intrusive rocks. Preliminary radiocarbon dating indicates that this deep groundwater has an apparent age of less than 5000 years BP but it is the result of mixing recent water recharge with very old deep groundwater. Most of the groundwater flow occurs through the old raised volcanic shield of submarine and subaerial formations and later Miocene subaerial basalts. Groundwater transit time through the unsaturated zone is of a few decades, which allows the consideration of long-term quasi-steady state recharge. Transit times are up to a few centuries through the saturated old volcanics and up to several millennia in the intrusive formations, where isolated pockets of very old water may exist.

  16. Migrant biomass and respiratory carbon flux by zooplankton and micronekton in the subtropical northeast Atlantic Ocean (Canary Islands)

    Science.gov (United States)

    Ariza, A.; Garijo, J. C.; Landeira, J. M.; Bordes, F.; Hernández-León, S.

    2015-05-01

    Diel Vertical Migration (DVM) in marine ecosystems is performed by zooplankton and micronekton, promoting a poorly accounted export of carbon to the deep ocean. Major efforts have been made to estimate carbon export due to gravitational flux and to a lesser extent, to migrant zooplankton. However, migratory flux by micronekton has been largely neglected in this context, due to its time-consuming and difficult sampling. In this paper, we evaluated gravitational and migratory flux due to the respiration of zooplankton and micronekton in the northeast subtropical Atlantic Ocean (Canary Islands). Migratory flux was addressed by calculating the biomass of migrating components and measuring the electron transfer system (ETS) activity in zooplankton and dominant species representing micronekton (Euphausia gibboides, Sergia splendens and Lobianchia dofleini). Our results showed similar biomass in both components. The main taxa contributing to DVM within zooplankton were juvenile euphausiids, whereas micronekton were mainly dominated by fish, followed by adult euphausiids and decapods. The contribution to respiratory flux of zooplankton (3.4 ± 1.9 mg C m-2 d-1) was similar to that of micronekton (2.9 ± 1.0 mg C m-2 d-1). In summary, respiratory flux accounted for 53% (range 23-71) of the gravitational flux measured at 150 m depth (11.9 ± 5.8 mg C m-2 d-1). However, based on larger migratory ranges and gut clearance rates, micronekton are expected to be the dominant component that contributes to carbon export in deeper waters. Micronekton estimates in this paper as well as those in existing literature, although variable due to regional differences and difficulties in calculating their biomass, suggest that carbon fluxes driven by this community are important for future models of the biological carbon pump.

  17. Detection and assessment of land use dynamics on Tenerife (Canary Islands): the agricultural development between 1986 and 2010

    Science.gov (United States)

    Günthert, Sebastian; Naumann, Simone; Siegmund, Alexander

    2012-10-01

    Since Spanish colonial times, the Canary Islands and especially Tenerife have always been used for intensive agriculture. Today almost 1/4 of the total area of Tenerife are agriculturally affected, whereas especially mountainous areas with suitable climate conditions are drastically transformed for agricultural use by building of large terraces. In recent years, political and economical developments lead to a further transformation process, especially inducted by an expansive tourism, which caused concentration- and intensification-tendencies of agricultural land use in lower altitudes as well as agricultural set-aside and rural exodus in the hinterland. The overall aim of the research at hand is to address the agricultural land use dynamics of the past decades, to statistically assess the causal reasons for those changes and to model the future agricultural land use dynamics on Tenerife. Therefore, an object-based classification procedure for recent RapidEye data (2010), Spot 4 (1998) as well as SPOT 1 (1986-88) imagery was developed, followed by a post classification comparison (PCC). Older agricultural fallow land or agricultural set-aside with a higher level of natural succession can hardly be acquired in the used medium satellite imagery. Hence, a second detection technique was generated, which allows an exact identification of the total agriculturally affected area on Tenerife, also containing older agricultural fallow land or agricultural set-aside. The method consists of an automatic texture-oriented detection and area-wide extraction of linear agricultural structures (plough furrows and field boundaries of arable land, utilised and non-utilised agricultural terraces) in current orthophotos of Tenerife. Once the change detection analysis is realised, it is necessary to identify the different driving forces which are responsible for the agricultural land use dynamics. The statistical connections between agricultural land use changes and these driving forces

  18. Isolation and Molecular Identification of Vermamoeba vermiformis Strains from Soil Sources in El Hierro Island, Canary Islands, Spain.

    Science.gov (United States)

    Reyes-Batlle, María; Wagner, Carolina; Zamora-Herrera, Jonadab; Vargas-Mesa, Alejandro; Sifaoui, Ines; González, Ana C; López-Arencibia, Atteneri; Valladares, Basilio; Martínez-Carretero, Enrique; Piñero, José E; Lorenzo-Morales, Jacob

    2016-07-01

    Free-living amoebae (FLA) are widely distributed protozoa in the environment and have been isolated from many sources such as dust, soil and water. Furthermore, some genera/species of FLA such as Naegleria fowleri, Balamuthia mandrillaris and Acanthamoeba spp. are also able to cause opportunistic infections in humans and other animals. More recently, FLA have been reported to be environmental carriers of pathogenic bacteria, fungi and viruses, and thus have gained further importance from the public health point of view. Among them, Acanthamoeba spp. and Vermamoeba vermiformis have been described in many occasions as the most common carriers of pathogens of high medical relevance such as Legionella pneumophila and Mycobacterium spp. In this study, 24 soil samples were collected from the island of El Hierro, Canary Islands, Spain, in order to check for the presence of V. vermiformis strains in these samples. Soil samples were cultured on 2 % non-nutrient agar plates covered with a thin layer of heat-killed E. coli and checked daily for the presence of Vermamoeba. After a week, V. vermiformis amoebae were observed in 5 of the 24 processed samples (20.8 %) incubated at room temperature and 37 °C. Molecular characterization was carried out by amplifying the 18S rDNA gene and DNA sequencing, confirming that the isolated strains belonged to Vermamoeba vermiformis species. The high percentage of V. vermiformis in the studied soil sources should raise awareness in the region since these amoebae are potential environmental carriers of pathogens of high medical relevance. PMID:27056561

  19. Implementation of Response to Intervention (RtI) Model in Spain: an example of a collaboration between Canarian universities and the department of education of the Canary Islands.

    Science.gov (United States)

    Jiménez, Juan E; Rodríguez, Cristina; Crespo, Patricia; González, Desirée; Artiles, Ceferino; Alfonso, Miguel

    2010-11-01

    The purpose of this study was to examine the effectiveness of second tier intervention at-risk readers within the context of a Response to Intervention approach. The study was conducted in the Canary Islands (Spain), directed by research team ¨Dificultades de Aprendizaje, Psicolingüística y Nuevas Tecnologías¨ (DEA&NT) from University of La Laguna, and supported by the Government of the Canary Islands. A sample of 1.123 Spanish children from fourteen schools districts were given the Spanish adaptation of The Hong Kong Specific Learning Difficulties Behavior Checklist and children who scored at or above the 75th percentile on the test were classified as "at risk" for early reading difficulties. Half of the students were randomly assigned to a project-based intervention condition where they received small group supplementary intervention for 30 minutes daily using the Prevención de las Dificultades Específicas de Aprendizaje (PREDEA) curriculum from mid to late December and continued until mid June. The other half received whatever remedial services were available at their schools. Results indicated that children who received the PREDEA curriculum had higher scores on the Early Grade Reading Assessment Test (EGRA) on initial sound identification, listening comprehension, letter sound knowledge and oral reading fluency compared to the control group.

  20. Evaluation of content and estimation of daily intake of cadmium and lead in several varieties of potatoes (Solanum tuberosum L.) cultivated in the Canary Islands (Spain).

    Science.gov (United States)

    Luis, G; Rubio, C; González-Weller, D; Gutiérrez, A J; Revert, C; Hardisson, A

    2014-04-01

    Monitoring the metal content in foods such as potatoes is an important aspect of food safety and regulation. Samples of nine varieties of potatoes (73 samples of local potatoes and 77 samples of imported potatoes) were randomly obtained from supermarkets, farmers markets, and farmer plots in Tenerife (Canary Islands, Spain). The edible portion (pulp) was the only part considered for analysis because Spaniards traditionally eat only peeled potatoes. Cadmium (Cd) and lead (Pb) were determined using graphite furnace atomic absorption spectrometry. Cd concentrations ranged from 0.006 mg/kg in the Cara and Negra varieties to 0.019 mg/kg in the Bonita variety, and Pb concentrations ranged from 0.007 mg/kg in the Up-to-date variety to 0.023 mg/kg in the Recara variety. The mean concentrations of Cd (0.01 mg/kg) and Pb (0.014 mg/kg) were below the limits established by European regulations for potatoes (0.1 mg/kg of wet weight for each metal). Based on a mean consumption of 143.2 g of potato per person per day for the Canary Islands population, the mean daily intakes of Cd (0.015 mg/day) and Pb (0.023 mg/day) were below the legislated respective tolerable weekly intakes. Thus, the samples analyzed were considered safe to eat with regard to the metal concentrations found. PMID:24680081

  1. Implementation of Response to Intervention (RtI) Model in Spain: an example of a collaboration between Canarian universities and the department of education of the Canary Islands.

    Science.gov (United States)

    Jiménez, Juan E; Rodríguez, Cristina; Crespo, Patricia; González, Desirée; Artiles, Ceferino; Alfonso, Miguel

    2010-11-01

    The purpose of this study was to examine the effectiveness of second tier intervention at-risk readers within the context of a Response to Intervention approach. The study was conducted in the Canary Islands (Spain), directed by research team ¨Dificultades de Aprendizaje, Psicolingüística y Nuevas Tecnologías¨ (DEA&NT) from University of La Laguna, and supported by the Government of the Canary Islands. A sample of 1.123 Spanish children from fourteen schools districts were given the Spanish adaptation of The Hong Kong Specific Learning Difficulties Behavior Checklist and children who scored at or above the 75th percentile on the test were classified as "at risk" for early reading difficulties. Half of the students were randomly assigned to a project-based intervention condition where they received small group supplementary intervention for 30 minutes daily using the Prevención de las Dificultades Específicas de Aprendizaje (PREDEA) curriculum from mid to late December and continued until mid June. The other half received whatever remedial services were available at their schools. Results indicated that children who received the PREDEA curriculum had higher scores on the Early Grade Reading Assessment Test (EGRA) on initial sound identification, listening comprehension, letter sound knowledge and oral reading fluency compared to the control group. PMID:21044535

  2. Eighteen years of geochemical monitoring at the oceanic active volcanic island of El Hierro (Canary Islands, Spain)

    Science.gov (United States)

    Asensio-Ramos, María; Alonso, Mar; Sharp, Emerson; Woods, Hannah; Barrancos, José; Pérez, Nemesio M.

    2016-04-01

    We report herein the latest results of a diffuse CO2 efflux survey at El Hierro volcanic system carried out during the summer period of 2015 to constrain the total CO2 output from the studied area a during post-eruptive period. El Hierro Island (278 km2) is the youngest and the SW-most of the Canary Islands. On July 16, 2011, a seismic-volcanic crisis started with the occurrence of more than 11,900 seismic events and significant deformation along the island. On October 10, 2011, the dominant character of seismicity changed dramatically from discrete earthquakes to continuous tremor, a clear indication that magma was rapidly approaching the surface immediately before the onset of the eruption, October 12. Eruption was declared over on 5 March, 2012. In order to monitor the volcanic activity of El Hierro Island, from 1998 to 2015 diffuse CO2 emission studies have been performed at El Hierro volcanic system in a yearly basis (˜600 observation sites) according to the accumulation chamber method. Spatial distribution maps were constructed following the sequential Gaussian simulation (sGs) procedure. To quantify the total CO2 emission from the studied area, 100 simulations for each survey have been performed. During the eruption period, soil CO2 efflux values range from non-detectable (˜0.5 g m‑2 d‑1) up to 457 g m‑2 d‑1, reaching in November 27, 2011, the maximum CO2 output estimated value of all time series, 2,398 t d‑1, just before the episodes of maximum degassing observed as vigorous bubbling at the sea surface and an increment in the amplitude of the tremor signal. During the 2015 survey, soil CO2 efflux values ranged from non-detectable up to 41 g m‑2 d‑1. The spatial distribution of diffuse CO2 emission values seemed to be controlled by the main volcano structural features of the island. The total diffuse CO2 output released to atmosphere was estimated at 575 ± 24 t d‑1, value slightly higher that the background CO2 emission estimated at 422 t

  3. Volcanic and geochemical evolution of the Teno massif, Tenerife, Canary Islands: Some repercussions of giant landslides on ocean island magmatism

    Science.gov (United States)

    Longpré, Marc-Antoine; Troll, Valentin R.; Walter, Thomas R.; Hansteen, Thor H.

    2009-12-01

    Large-scale, catastrophic mass wasting is a major process contributing to the dismantling of oceanic intraplate volcanoes. Recent studies, however, have highlighted a possible feedback relationship between flank collapse, or incipient instability, and subsequent episodes of structural rearrangement and/or renewed volcano growth. The Teno massif, located in northwestern Tenerife (Canary Islands), is a deeply eroded Miocene shield volcano that was built in four major eruptive phases punctuated by two lateral collapses, each removing >20-25 km3 of the volcano's north flank. In this paper, we use detailed field observations and petrological and geochemical data to evaluate possible links between large-scale landslides and subsequent volcanism/magmatism during Teno's evolution. Inspection of key stratigraphic sequences reveals that steep angular unconformities, relics of paleolandslide scars, are marked by polymict breccias. Near their base, these deposits typically include abundant juvenile pyroclastic material, otherwise scarce in the region. While some of Teno's most evolved, low-density magmas were produced just before flank collapses, early postlandslide lava sequences are characterized by anomalously high proportions of dense ankaramite flows, extremely rich in clinopyroxene and olivine crystals. A detailed sampling profile shows transitions from low-Mg # lavas relatively rich in SiO2 to lavas with low silica content and comparatively high Mg # after both landslides. Long-term variations in Zr/Nb, normative nepheline, and La/Lu are coupled but do not show a systematic correlation with stratigraphic boundaries. We propose that whereas loading of the growing precollapse volcano promoted magma stagnation and differentiation, the successive giant landslides modified the shallow volcano-tectonic stress field at Teno, resulting in widespread pyroclastic eruptions and shallow magma reservoir drainage. This rapid unloading of several tens of km3 of near-surface rocks

  4. Groundwater flow in a relatively old oceanic volcanic island: The Betancuria area, Fuerteventura Island, Canary Islands, Spain

    Energy Technology Data Exchange (ETDEWEB)

    Herrera, Christian, E-mail: cherrera@ucn.cl [Universidad Católica del Norte, Av. Angamos 0610, Antofagasta (Chile); Custodio, Emilio [Department of Geo-Engineering, Technical University of Catalonia (UPC), Barcelona (Spain)

    2014-10-15

    The island of Fuerteventura is the oldest of the Canary Islands' volcanic archipelago. It is constituted by volcanic submarine and subaerial activity and intrusive Miocene events, with some residual later volcanism and Quaternary volcanic deposits that have favored groundwater recharge. The climate is arid, with an average rainfall that barely attains 60 mm/year in the coast and up to 200 mm/year in the highlands. The aquifer recharge is small but significant; it is brackish due to large airborne atmospheric salinity, between 7 and 15 g m{sup −2} year{sup −1} of chloride deposition, and high evapo-concentration in the soil. The average recharge is estimated to be less than about 5 mm/year at low altitude and up to 10 mm/year in the highlands, and up to 20 mm/year associated to recent lava fields. Hydrochemical and water isotopic studies, supported by water table data and well and borehole descriptions, contribute a preliminary conceptual model of groundwater flow and water origin in the Betancuria area, the central area of the island. In general, water from springs and shallow wells tends to be naturally brackish and of recent origin. Deep saline groundwater is found and is explained as remnants of very old marine water trapped in isolated features in the very low permeability intrusive rocks. Preliminary radiocarbon dating indicates that this deep groundwater has an apparent age of less than 5000 years BP but it is the result of mixing recent water recharge with very old deep groundwater. Most of the groundwater flow occurs through the old raised volcanic shield of submarine and subaerial formations and later Miocene subaerial basalts. Groundwater transit time through the unsaturated zone is of a few decades, which allows the consideration of long-term quasi-steady state recharge. Transit times are up to a few centuries through the saturated old volcanics and up to several millennia in the intrusive formations, where isolated pockets of very old water may

  5. Validación de un cuestionario de frecuencia de consumo de alimentos adaptado para el estudio y seguimiento de la población adulta de las Islas Canarias

    Directory of Open Access Journals (Sweden)

    Armando Aguirre-Jaime

    2008-01-01

    Full Text Available Fundamento: Registrar los hábitos alimenticios exige de un método válido y fiable. El objetivo del estudio es validar el cuestionario de frecuencia de consumo de alimentos CDCFFQ, que es una adaptación de otro cuestionario, para estudiar la alimentación de la población adulta de Canarias. Métodos: El cuestionario CDC-FFQ fue administrado a 1.067 personas de la población general (PG y a 106 estudiantes universitarios (EU, de 19 a 30 años. El segundo grupo fue encuestado también sobre tres recordatorios de 24 horas. Se comparan los nutrientes según CDC-FFQ en PG y EU. Se estiman las correlaciones entre CDC-FFQ y los recordatorios para nutrientes y grupos de alimentos, y la concordancia de consumos de nutrientes y grupos de alimentos en los quintiles extremos, para los estudiantes universitarios. Resultados: Los valores medios entre nutrientes del CDC-FFQ entre PG, EU y población general con estudios universitarios no mostraron diferencias significativas excepto para la vitamina B12 (p=0.004 y la vitamina D (p=0,005. Entre el CDC-FFQ y la media de los tres recordatorios se obtuvieron correlaciones en el rango de 0,202-0,601 entre nutrientes ajustados por calorías consumidas para los estudiantes universitarios. Por grupos de alimentos las correlaciones oscilaron para CDC-FFQ y los recordatorios entre 0,243- 0,542. La concordancia de nutrientes osciló entre 39% y 100% y para grupos de alimentos entre 41% y 100%. Conclusiones: El cuestionario CDC-FFQ resulta válido para clasificar a los sujetos en los rangos relativos de su nivel de ingesta de alimentos y nutrientes, por lo que podría ser útil en estudios epidemiológicos con valoración de dieta en población canaria adulta.

  6. Evolución de la mortalidad y de los años de vida perdidos prematuramente relacionados con el consumo de alcohol en las Islas Canarias (1980-1998

    Directory of Open Access Journals (Sweden)

    Bello L.M.

    2003-01-01

    Full Text Available Objetivo: Describir la mortalidad y los años de vida perdidos prematuramente (AVPP relacionados con el alcohol en las Islas Canarias durante el período 1980-1998. Métodos: Las defunciones por edad, sexo y causa desde 1980 a 1998 se obtuvieron del Instituto Nacional de Estadística (Movimiento Natural de la Población. Se calculó la proporción de muertes relacionadas con el alcohol para cada año, sexo y grupo de edad a partir de la fracción atribuible poblacional propuesta por los Centers for Disease Control (Estados Unidos. Para cada categoría diagnóstica, los años de vida perdidos prematuramente relacionados con el alcohol fueron calculados multiplicando las defunciones por la fracción poblacional en grupos quinquenales de edad para ambos sexos hasta la edad de 65 años. Resultados: Durante el período 1980-1998, el número de fallecimientos por causas relacionadas con el alcohol fue de 12.614, con un promedio del 6,4% anual y una razón varón/mujer de aproximadamente 2:1. Las neoplasias malignas, las enfermedades digestivas y los accidentes no intencionales relacionados con el alcohol presentan las mayores tasas de mortalidad y de AVPP tanto en varones como en mujeres; en particular, los accidentes no intencionales generan AVPP por encima de las otras causas, lo que supone el 50,6% del total de AVPP por causas relacionadas con el alcohol en varones y el 55,5% en mujeres. Durante el período de estudio, la cirrosis hepáticas y otras enfermedades crónicas del hígado (CIE 571 van decreciendo paulatinamente en los varones y se mantienen en las mujeres. Conclusiones: En el ámbito y período de estudio (Islas Canarias, 1980-1998, se ha observado que el porcentaje de fallecidos por causas relacionadas con el alcohol es elevado, incluyendo la mortalidad por cirrosis hepática. Por tanto, sería necesario potenciar el desarrollo de estrategias educativas y otras dirigidas para controlar su consumo, sobre todo en los jóvenes.

  7. Aplicación de técnicas de teledetección al estudio de la turbidez de las aguas litorales en la costa oriental de Gran Canaria mediante un modelo teórico

    Directory of Open Access Journals (Sweden)

    Juan Francisco Hernández Bartolomé

    2013-11-01

    Full Text Available La creciente presión antrópica sobre los litorales exige de las Administraciones la puesta en marcha de controles, con el fin de conocer —y garantizar— la calidad del medio natural, de tal forma que permitan estimar su deterioro y, en caso necesario, proceder a entablar medidas que posibiliten su salvaguarda. Con ello, además, se garantiza la protección de la sociedad frente a posibles afecciones inducidas por sus propias actividades. Entre los seguimientos que hoy cobran más interés se encuentra el control de la calidad de las aguas costeras, labor que se realiza, normalmente, mediante técnicas de muestreo y análisis sistemático de componentes. En este campo, las técnicas de Teledetección posibilitan un mejor y más exacto seguimiento, dadas las resoluciones de los sensores situados a bordo de plataformas espaciales. Siguiendo esta línea, este estudio pretende mostrar las posibilidades de estas técnicas, aplicando para ello un método de trabajo basado en un modelo teórico, que permite extraer los principales rasgos de un episodio de turbidez en la costa oriental de Gran Canaria.The growing human activities on the coastal zones, cause to the Civil Services to take necessaries controls to know the quality of the environment, to estimate their damage, and if necessary, to establish steps to protect them; and also to protect the human societies from hypothetical illness induced by themselves. Among the more used controls today, the quality of coastal waters has got special interest, work usually made by systematic analysis of samples taken along the studies zones. In this field, remote sensing techniques guarantee a better and more exact control, due to the resolutions of sensors aboard space platforms. In this line, this study try to show the possibilities of these techniques, applying a work method based on a theoretical model, which allows us to extract the principal features of a turbidity episode in the eastern coast of Gran

  8. Patrones de distribución, abundancia y riqueza de especies de la avifauna terrestre de la isla de La Palma (islas Canarias

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    Carrascal, L. M.

    2008-12-01

    Full Text Available We estimate the population size and density, habitat preferences, habitat breadth and probable population trends in the last 25-15 years of the diurnal terrestrial bird species breeding in La Palma island (Canary islands. Data were obtained in a large extensive census program carried out during the 2007 nesting period using line transects that allowed detectability estimations. We also explored patterns of species richness both at inter-habitat and local scale. Local species richness (species per 0.5 km transects showed an important geographical component, increasing from south to north, from west to east, and reaching maximum values at altitudes around 600-1,000 m a.s.l. It was also positively related to vegetation development (specially in the herbaceous and shrub layer, and negatively associated with urbanization and agriculture. Total bird density reached the highest figures in the ‘monteverde’ (laurel and heath forests ca. 650 aves/km2, and in the transition pinewoods-laurel forests (509 aves/km2, while the lowest figures were recorded in high altitude shrublands (153 aves/km2 and recent lava fields (58 aves/km2. The bird species with lower population sizes are Falco [peregrinus] pelegrinoides, Burhinus oedicnemus distinctus, Upupa epops, Carduelis carduelis, Miliaria calandra and Petronia petronia, while the last five species have undergone more negative population trends in the last 15-25 years.

    Se estiman los niveles poblacionales, las densidades ecológicas, los principales patrones de preferencia de hábitat, las posibles tendencias demográficas habidas en los últimos 25 y 15 años, y el estatus de conservación actual de las especies de aves terrestres diurnas reproductoras en la isla de La Palma. Los datos fueron obtenidos durante el periodo reproductor de 2007, utilizando transectos lineales. En total se efectuaron 437 transectos de 0,5 km repartidos por toda la

  9. Phylogenetic Analysis Supports Horizontal Transmission as a Driving Force of the Spread of Avian Bornaviruses

    Science.gov (United States)

    Rubbenstroth, Dennis; Schmidt, Volker; Rinder, Monika; Legler, Marko; Twietmeyer, Sönke; Schwemmer, Phillip; Corman, Victor M.

    2016-01-01

    Background Avian bornaviruses are a genetically diverse group of viruses initially discovered in 2008. They are known to infect several avian orders. Bornaviruses of parrots and related species (Psittaciformes) are causative agents of proventricular dilatation disease, a chronic and often fatal neurologic disease widely distributed in captive psittacine populations. Although knowledge has considerably increased in the past years, many aspects of the biology of avian bornaviruses are still undiscovered. In particular, the precise way of transmission remains unknown. Aims and Methods In order to collect further information on the epidemiology of bornavirus infections in birds we collected samples from captive and free-ranging aquatic birds (n = 738) and Passeriformes (n = 145) in Germany and tested them for the presence of bornaviruses by PCR assays covering a broad range of known bornaviruses. We detected aquatic bird bornavirus 1 (ABBV-1) in three out of 73 sampled free-ranging mute swans (Cygnus olor) and one out of 282 free-ranging Eurasian oystercatchers (Haematopus ostralegus). Canary bornavirus 1 (CnBV-1), CnBV-2 and CnBV-3 were detected in four, six and one out of 48 captive common canaries (Serinus canaria forma domestica), respectively. In addition, samples originating from 49 bornavirus-positive captive Psittaciformes were used for determination of parrot bornavirus 2 (PaBV-2) and PaBV-4 sequences. Bornavirus sequences compiled during this study were used for phylogenetic analysis together with all related sequences available in GenBank. Results of the Study Within ABBV-1, PaBV-2 and PaBV-4, identical or genetically closely related bornavirus sequences were found in parallel in various different avian species, suggesting that inter-species transmission is frequent relative to the overall transmission of these viruses. Our results argue for an important role of horizontal transmission, but do not exclude the additional possibility of vertical transmission

  10. Floating stones off El Hierro, Canary Islands: xenoliths of pre-island sedimentary origin in the early products of the October 2011 eruption

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    V. R. Troll

    2012-03-01

    Full Text Available A submarine eruption started off the south coast of El Hierro, Canary Islands, on 10 October 2011 and continues at the time of this writing (February 2012. In the first days of the event, peculiar eruption products were found floating on the sea surface, drifting for long distances from the eruption site. These specimens, which have in the meantime been termed "restingolites" (after the close-by village of La Restinga, appeared as black volcanic "bombs" that exhibit cores of white and porous pumice-like material. Since their brief appearance, the nature and origin of these "floating stones" has been vigorously debated among researchers, with important implications for the interpretation of the hazard potential of the ongoing eruption. The "restingolites" have been proposed to be either (i juvenile high-silica magma (e.g. rhyolite, (ii remelted magmatic material (trachyte, (iii altered volcanic rock, or (iv reheated hyaloclastites or zeolite from the submarine slopes of El Hierro. Here, we provide evidence that supports yet a different conclusion. We have analysed the textures and compositions of representative "restingolites" and compared the results to previous work on similar rocks found in the Canary Islands. Based on their high-silica content, the lack of igneous trace element signatures, the presence of remnant quartz crystals, jasper fragments and carbonate as well as wollastonite (derived from thermal overprint of carbonate and their relatively high oxygen isotope values, we conclude that "restingolites" are in fact xenoliths from pre-island sedimentary layers that were picked up and heated by the ascending magma, causing them to partially melt and vesiculate. As they are closely resembling pumice in appearance, but are xenolithic in origin, we refer to these rocks as "xeno-pumice". The El Hierro xeno-pumices hence represent messengers from depth that help us to understand the interaction between ascending magma and crustal lithologies

  11. Estructura poblacional y distribución espacial de los moluscos gasterópodos Osilinus atrata y Osilinus sauciatus en el intermareal rocoso de las Islas Canarias (Atlántico centro-oriental

    Directory of Open Access Journals (Sweden)

    2005-01-01

    Full Text Available Por medio de un diseño de muestreo jerárquico se estudió la estructura poblacional y los patrones espaciales de variabilidad horizontal (diferencias entre las islas, las localidades dentro de las islas y los sitios dentro de localidades y vertical (diferencias entre bandas de la zona intermareal de los moluscos gasterópodos Osilinus atrata y O. sauciatus a lo largo del intermareal rocoso de las Islas Canarias. Se observaron diferencias en los patrones espaciales de distribución, abundancia y tamaño para ambas especies. Osilinus atrata fue más abundante que O. sauciatus en todo el Archipiélago Canario. Su abundancia varió entre las islas, presentando una distribución heterogénea entre las bandas intermareales de una isla a otra, si bien fue más frecuente en las bandas intermedia y superior. Osilinus sauciatus sólo se encontró en las islas orientales y no exhibió diferencias significativas entre las bandas, a pesar de que 91.35% de los individuos aparecieron en la banda superior y el resto en la banda intermedia. Osilinus sauciatus mostró una talla mayor que las de O. atrata. A su vez, ambas especies presentaron en general las mayores tallas medias en la banda superior.

  12. Estimación de la prevalencia del trastorno por déficit de atención con o sin hiperactividad (TDAH en población escolar de la Comunidad Autónoma de Canarias

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    Juan E. Jiménez

    2012-06-01

    Full Text Available Este estudio ha tenido por finalidad determinar la prevalencia del Trastorno por Déficit de Atención con o sin Hiperactividad (TDAH en la Comunidad Autónoma de Canarias, en la población de 6 a 12 años. Para ello, el muestreo utilizado fue polietápico estratificado y proporcional por conglomerados. Los estratos fueron el tipo de colegio, la y el nivel educativo, y los conglomerados fueron los colegios. A partir de una muestra de estudio de 118.467 alumnos escolarizados en centros ordinarios, se obtuvo una muestra al azar de 2.395 alumnos. Se utilizaron las escalas Attention-Deficit/Hiperactivity Disorder Rating Scales IV (ADHD RS-IV modificadas para padres y maestros. Se encontró una tasa global de prevalencia del 4.9%, de los cuales el 3.1% fueron del subtipo inatento, el 1.1% hiperactivo, y el 0.7% combinado. Solo se encontraron diferencias significativas en función del sexo, donde la incidencia fue superior en varones. Las implicaciones educativas y socio sanitarias de los hallazgos encontrados nos sugieren la importancia de llevar a cabo una identificación, diagnóstico y tratamiento temprano, lo que ayudará a que los niños identificados con TDAH puedan desarrollar todo su potencial, y con ello una reducción importante del gasto público.

  13. Atmospheric corrosion in subtropical areas: XRD and electrochemical study of zinc atmospheric corrosion products in the province of Santa Cruz de Tenerife (Canary Islands, Spain)

    International Nuclear Information System (INIS)

    In the present paper, zinc sheets have been exposed for 4 years to the action of different atmospheres in 35 test sites located in the province of Santa Cruz de Tenerife, Canary Islands, Spain. Corrosion products formed on the surface of the samples have been identified by means of X-ray diffraction (XRD) for the first and second year of exposure. Zincite, hydrozincite, simonkolleite, zinc chlorohydroxysulphate, zinc oxysulphate and zinc hydroxysulphate have been identified in the test sheets. Preliminary results of an electrochemical study of the breakdown potential of zinc samples are also presented in order to test the protective effect of the film formed on the surface of the samples. It was found that the protective effect of this film increases linearly with exposure time

  14. Heavy and trace metal concentrations in three rockpool shrimp species (Palaemon elegans, Palaemon adspersus and Palaemon serratus) from Tenerife (Canary Islands).

    Science.gov (United States)

    Lozano, Gonzalo; Herraiz, Elena; Hardisson, Arturo; Gutiérrez, Angel J; González-Weller, Dailos; Rubio, Carmen

    2010-09-01

    Trace metal concentrations (Fe, Cu, Co, Zn, Ni and V) were investigated in three rockpool shrimp species (Palaemon elegans, Palaemon adspersus and Palaemon serratus) from six littoral sampling sites (polluted and non-polluted) of Tenerife in the Canary Islands (Central Eastern Atlantic), Spain. Sex ratio for all three species has been determined: females predominate over males in all species and significant differences in total length and cephalothorax length was detected between sexes, being females larger than males. By other side, concentrations of trace metals were determined in whole specimens. Higher mean values for every metal were observed in P. adspersus. In males, higher values were observed in P. elegans and P. serratus, whereas in P. adspersus, mean values are higher in females. Finally, mean concentrations of trace metals studied were higher, in general terms, in the two clearly polluted stations: Santa Cruz of Tenerife commercial harbour and its fishery dock dependency.

  15. Quantification of ozone uptake at the stand level in a Pinus canariensis forest in Tenerife, Canary Islands: an approach based on sap flow measurements.

    Science.gov (United States)

    Wieser, Gerhard; Luis, Vanessa C; Cuevas, Emilio

    2006-04-01

    Ozone uptake was studied in a pine forest in Tenerife, Canary Islands, an ecotone with strong seasonal changes in climate. Ambient ozone concentration showed a pronounced seasonal course with high concentrations during the dry and warm period and low concentrations during the wet and cold season. Ozone uptake by contrast showed no clear seasonal trend. This is because canopy conductance significantly decreased with soil water availability and vapour pressure deficit. Mean daily ozone uptake averaged 1.9 nmol m(-2) s(-1) during the wet and cold season, and 1.5 nmol m(-2) s(-1) during the warm and dry period. The corresponding daily mean ambient ozone concentrations were 42 and 51 nl l(-1), respectively. Thus we conclude that in Mediterranean type forest ecosystems the flux based approach is more capable for risk assessment than an external, concentration based approach.

  16. Atmospheric corrosion in subtropical areas: XRD and electrochemical study of zinc atmospheric corrosion products in the province of Santa Cruz de Tenerife (Canary Islands, Spain)

    Energy Technology Data Exchange (ETDEWEB)

    Morales, J. [Departamento de Quimica Fisica, Universidad de La Laguna, 38071 La Laguna, Tenerife (Spain)]. E-mail: jmorales@ull.es; Diaz, F. [Departamento de Quimica Fisica, Universidad de La Laguna, 38071 La Laguna, Tenerife (Spain); Hernandez-Borges, J. [Departamento de Quimica Analitica, Nutricion y Bromatologia, Universidad de La Laguna, 38071 La Laguna, Tenerife (Spain); Gonzalez, S. [Departamento de Quimica Fisica, Universidad de La Laguna, 38071 La Laguna, Tenerife (Spain)

    2006-02-15

    In the present paper, zinc sheets have been exposed for 4 years to the action of different atmospheres in 35 test sites located in the province of Santa Cruz de Tenerife, Canary Islands, Spain. Corrosion products formed on the surface of the samples have been identified by means of X-ray diffraction (XRD) for the first and second year of exposure. Zincite, hydrozincite, simonkolleite, zinc chlorohydroxysulphate, zinc oxysulphate and zinc hydroxysulphate have been identified in the test sheets. Preliminary results of an electrochemical study of the breakdown potential of zinc samples are also presented in order to test the protective effect of the film formed on the surface of the samples. It was found that the protective effect of this film increases linearly with exposure time.

  17. On the Confession of a Canary Bird, Children on a Holiday Camp, and the Apology for Fleas Planned by Janusz Korczak

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    Agnieszka Zgrzywa

    2013-01-01

    Full Text Available The point of departure for this article is the memory of moving fragments of Janusz Korczak’s journal from Warsaw ghetto. The author confronts the fragments with Korczak’s earlier texts, such as the short storied about holiday camps for Polish and Jewish children, and the novel Król Maciuś na bezludnej wyspie [King Maciuś on a Desert Island]. The image of a canary bird, used in the novel, is confronted with other symbolic stories about this bird, such as the story in Wiesław Myśliwski’s Pałac [Palace]. With reference to the image, the article invokes Korczak’s meditations on identity and tolerance, and human ethical and aesthetic choices. The audacity of Korczak’s thoughts and conclusions goes far beyond his time, and seems perfectly fit for ours.

  18. After Timanfaya: overpopulation and soil erosion in the north of Lanzarote (Canary Islands); Tras Timanfaya: susperpoblacion y erosion de suelo en el norte de Lanzarote

    Energy Technology Data Exchange (ETDEWEB)

    Criado, C.; Romero, C.; Solar, V.

    2009-07-01

    The eruption of Timanfaya (1730-1736) has been the most important volcanic activity on Canary Islands during historical times (after XV Century). The lave flows and piroclastic layers buried at least 1/4 of Lanzarote surface. Overall the island we can see artificial cross-sections showing ash layers, overlapping paleargids soils or interbedded between alluvial sediment on the bottom of in filled valleys. Sedimentological analysis has been applied on four cross-section located along the island. These data, together with historical information and pottery remains, allow conclude a very recent age for many of this layers, produced by a strong erosion input started by the overgrazing produced by the concentration of livestock during the volcanic crisis. (Author) 6 refs.

  19. Characterization of six microsatellite loci in Myrica faya (Myricaceae and cross amplification in the endangered endemic M. rivas-martinezii in Canary Islands, Spain

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    Miguel A. González-Pérez

    2009-01-01

    Full Text Available Six novel polymorphic microsatellite markers were isolated from enriched libraries in Myrica faya Ait., recently renamed Morella faya , (fayatree, firetree, or firebush in order to examine the genetic diversity in natural populations. Also, test cross-specific amplification and genetic diversity in Myrica rivas-martinezii, which is endemic on the Canary islands. Microsatellite loci were screened in 225 individuals of both species from different islands of the Canarian archipelago. All markers were successfully amplified from both Myrica species, with an average number of 6.5 and 9.3 alleles per locus in M. rivas-martinezii and M. faya , respectively. There was no evidence for linkage disequilibrium between loci, and the probability of null alleles ranged from 0.01 to 0.17.

  20. Geomorphological features in the southern Canary Island Volcanic Province: The importance of volcanic processes and massive slope instabilities associated with seamounts

    Science.gov (United States)

    Palomino, Desirée; Vázquez, Juan-Tomás; Somoza, Luis; León, Ricardo; López-González, Nieves; Medialdea, Teresa; Fernández-Salas, Luis-Miguel; González, Francisco-Javier; Rengel, Juan Antonio

    2016-02-01

    The margin of the continental slope of the Volcanic Province of Canary Islands is characterised by seamounts, submarine hills and large landslides. The seabed morphology including detailed morphology of the seamounts and hills was analysed using multibeam bathymetry and backscatter data, and very high resolution seismic profiles. Some of the elevation data are reported here for the first time. The shape and distribution of characteristics features such as volcanic cones, ridges, slides scars, gullies and channels indicate evolutionary differences. Special attention was paid to recent geological processes that influenced the seamounts. We defined various morpho-sedimentary units, which are mainly due to massive slope instability that disrupt the pelagic sedimentary cover. We also studied other processes such as the role of deep bottom currents in determining sediment distribution. The sediments are interpreted as the result of a complex mixture of material derived from a) slope failures on seamounts and submarine hills; and b) slides and slumps on the continental slope.