La identidad en la encrucijada: la comunidad galesa del Chubut y las conmemoraciones del Centenario y Bicentenario de la Revolución de Mayo

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Geraldine Lublin

2013-12-01

Full Text Available El presente artículo se propone rastrear a grandes rasgos la relación ―especial‖ entre el estado nacional argentino y, a partir de 1958, la provincia de Chubut por una parte y los colonos galeses que se establecieron en Chubut desde 1865 y sus descendientes por otra, a través del análisis de la posición de la colectividad galesa del Chubut en dos momentos históricos destacados: el Centenario y el Bicentenario de la Revolución de Mayo (1810. Al corresponderse el perfil de los galeses con la idea de poblaciones "civilizadas" que las autoridades pretendían impulsar en desmedro de los legítimos pobladores originales, estas políticas dieron lugar a una fuerte identificación histórica de la Provincia de Chubut con la llamada "gesta galesa". Se generó asimismo una peculiar dinámica triangular de las relaciones estatales, cuya evolución a través del tiempo ha desembocado en la actual promoción de la identidad chubutense como el resultado de la fusión de las culturas de los tehuelches originarios y los colonos galeses.

Presencia de microplásticos en cuatro playas arenosas de Perú

OpenAIRE

Purca, Sara; Henostroza, Aida

2017-01-01

Se presenta el número y peso por metro cuadrado de fragmentos de microplásticos presentes en cuatro playas arenosas de la costa peruana. Las muestras fueron colectadas entre junio de 2014 y mayo 2015. Fragmentos de plástico duro mayores a 1 mm fueron encontrados en más del 80% de las muestras de las cuatro playas. La playa Costa Azul (~ 12°S) presentó 522 fragmentos por metro cuadrado (items/m2) de microplásticos, de los cuales, 463.33 items/m2 y 2.6 g/m2 fueron plásticos duros. La playa Albú...

Contexto de las políticas agrarias en los proyectos de desarrollo para Patagonia: el "Informe Altimir" en la provincia de Chubut (1970

Directory of Open Access Journals (Sweden)

Gonzalo Pérez Álvarez

2015-12-01

Full Text Available El “Informe Altimir” es un trabajo solicitado por el Consejo Federal de Inversiones (CFI a un equipo de investigadores dirigido por Oscar Altimir, para ser entregado a la Asesoría de Desarrollo de Chubut en 1970.Su objetivo era planificar las acciones para la instalación del modelo de "polos de desarrollo" así como analizar las políticas a seguir en las otras áreas económicas. A través de una revisión exhaustiva de esta fuente, y de su cruce con otros aportes, mostramos cuáles fueron las políticas agrarias que se impulsaron en Chubut.Se dividió la provincia en regiones, para impulsar un proyecto que buscara asegurar el suministro de alimentos a las áreas urbanas, la provisión de mano de obra para las industrias a instalarse y la concentración de la propiedad en el resto de Chubut.

Comments on Racetrack playa: Rocks moved by wind alone

Science.gov (United States)

Sanz-Montero, M. E.; Cabestrero, Ó.; Rodríguez-Aranda, J. P.

2016-03-01

The mechanisms by which rocks move across the beds of playa lakes leaving tracks continue to be debated (Sanz-Montero and Rodríguez-Aranda, 2013; Norris et al., 2014; Sanz-Montero et al., 2015a,b; Baumgardner and Shaffer, 2015; Jones and Hooke, 2015). In this regard, the article by Jones and Hooke (Aeolian Research 19, 2015) is particularly interesting since it provides a description of these mechanisms by R. Jones who, during a storm event in 1972, was probably the first person to witness movement of rocks. The dominant meteorological conditions described by Jones during the period when the tracks were formed are, significantly, rather similar to those previously described by Clements (1952) at Little Bonnie Claire Playa (Nevada, USA). The storm conditions referred to in the article also coincide with the observations, measurements and deductions made by Sanz-Montero and Rodríguez-Aranda (2013) and Sanz-Montero et al. (2015a,b) at Altillo Chica playa lake, Central Spain. Furthermore, we were able to carry out an on-site analysis of the sedimentary structures at Racetrack playa in June 2015, allowing us to verify the similarity of the features present at both sites. Together with the important role played by gusty winds in the formation of the tracks, all the above mentioned studies point to the presence of a thin veneer of water, just a few millimeters deep, in the area of the playa lake where the rock movements occur. However, Jones and Hooke (2015) disregard the force exerted by moving water and analyze the coefficient of friction assuming that the rocks are moved by wind alone. We offer an alternative explanation for the movement of rocks both at Racetrack and Altillo Chica playa lake which considers not only the wind but also the role played by moving water in conjunction with other parameters which modify the erosion thresholds (rocks acting as obstacles) and reduce friction (benthic microorganisms).

Trends in Playa Inundation and Water Storage in the Ogallala Aquifer on the Texas High Plains

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Dennis Gitz

2016-08-01

Full Text Available The Ogallala Aquifer is an important source of irrigation water on the Texas High plains; however, significant decreases in saturated thickness threaten its future use for irrigation. A better understanding of the roles of playas, ephemeral surface ponds, in aquifer recharge is needed to establish levels of withdrawals that will meet either established desired future conditions or sustainability. In this study, data regarding playa inundation, depth to groundwater, precipitation and land cover from 2001 to 2011 were collected and analyzed to ascertain associations between these characteristics for four study areas on the Texas High plains. Each area covered 40,000–70,000 ha. Three of the study areas in Hockley, Floyd and Swisher counties were chosen because their center contained a playa instrumented to measure weather and depth of inundation. There were 20 distinct inundation events at the three instrumented playas between 2006 and 2010. For each of these inundations, water loss exceeded rates of potential evapotranspiration (ET by a factor of 1.6–15.7 times, implying that infiltration was occurring. Playa inundation in all four study areas was also assessed by analyzing images from the National Agricultural Imaginary program. Data on depth to groundwater were analyzed from 2000 to 2010 to determine annual changes of stored water. Annual changes in groundwater were weakly associated with surface area of inundated playas in late summer, but was strongly associated with annual rainfall. Rates of infiltration based on playa water loss versus potential ET, and volume of water in playas was more than sufficient to account for annual changes in groundwater. Land use adjoining the playas had less of influence on playa inundation than annual rainfall. These results strengthen the argument that water storage in playas on the Texas High Plains is an important source of water for aquifer recharge.

A hydrological simulation of the water regime in two playa lakes ...

Indian Academy of Sciences (India)

The definition of the surface–groundwater rela- tionship of the two unaltered playa lakes. Ballestera (henceforth 'Ball') and Calderón. (henceforth 'Cald'). • The simulation of an altered water regime caused by an increased anthropogenic GW consumption within the watershed area of Ball playa-lake. 2. The area of research.

D.C. resistivity investigation to identify pathways for infiltration through playa lake in the High Plains of Texas

Science.gov (United States)

Abila, H.; Gurrola, H.; Fernandez, A.; Taylor, T. L.; Gonzalez, I.; Duron, Z. W.; Garza, J.; Ortega, J.

2017-12-01

Playa lakes an important resource for the recharge of the Ogallala aquifer but we do not fully understand how water passes through these features. This is in part because playas can be very different in their ability to retain water. To help develop a better understanding of these playa lakes the geophysics class at Texas Tech University conducted a geophysical investigation (including seismic and conductivity measurements as well as soil sampling) of a playa lake that is a short distance north of Lubbock, Texas. This playa lake is compartmentalized and appears to be two small playas in close proximity. The wester of the two playa retains water better than does the eastern playa. The primary goal is to find geophysical anomalies beneath playas to identify "the wet spots" that may shed light as to the pathways for infiltration. This abstract reports on the results of the dipole-dipole D.C.-resistivity component of the investigation. Resistivity was collected using several 9 volt batteries connected in series with a switch box and hand held multimeters to collect current and voltage data. Pseudosections produced before the rainy season began showed a conductive body the match the distribution of the clay rich floor of the Playa. We believe this clay rich player was about 1 to 1.5 meters thick based on sharp increase in the conductivity at that depth interval that was flat across the entire playa. Pseudosections produced from data collected after rain storms showed that this conductive layer increased in depth by up to 1 meter and there appears to be vertical conductive anomalies through the playa floor that may indicate infiltration pathways through the clay floor of the playa.

Biophysical Controls over Carbon and Nitrogen Stocks in Desert Playa Wetlands

Science.gov (United States)

McKenna, O. P.; Sala, O. E.

2014-12-01

Playas are ephemeral desert wetlands situated at the bottom of closed catchments. Desert playas in the Southwestern US have not been intensively studied despite their potential importance for the functioning of desert ecosystems. We want to know which geomorphic and ecological variables control of the stock size of soil organic carbon, and soil total nitrogen in playas. We hypothesize that the magnitude of carbon and nitrogen stocks depends on: (a) catchment size, (b) catchment slope, (d) catchment vegetation cover, (e) bare-ground patch size, and (f) catchment soil texture. We chose thirty playas from across the Jornada Basin (Las Cruces, NM) ranging from 0.5-60ha in area and with varying catchment characteristics. We used the available 5m digital elevation map (DEM) to calculate the catchment size and catchment slope for these thirty playas. We measured percent cover, and patch size using the point-intercept method with three 10m transects in each catchment. We used the Bouyoucos-hydrometer soil particle analysis to determine catchment soil texture. Stocks of organic carbon and nitrogen were measured from soil samples at four depths (0-10 cm, 10-30 cm, 30-60 cm, 60-100 cm) using C/N combustion analysis. In terms of nitrogen and organic carbon storage, we found soil nitrogen values in the top 10cm ranging from 41.963-214.365 gN/m2, and soil organic carbon values in the top 10cm ranging from 594.339-2375.326 gC/m2. The results of a multiple regression analysis show a positive relationship between catchment slope and both organic carbon and nitrogen stock size (nitrogen: y= 56.801 +47.053, R2=0.621; organic carbon: y= 683.200 + 499.290x, R2= 0.536). These data support our hypothesis that catchment slope is one of factors controlling carbon and nitrogen stock in desert playas. We also applied our model to the 69 other playas of the Jornada Basin and estimated stock sizes (0-10cm) between 415.07-447.97 Mg for total soil nitrogen and 4627.99-5043.51 Mg for soil organic

Presencia de microplásticos en cuatro playas arenosas de Perú

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Sara Purca

2017-04-01

Full Text Available Se presenta el número y peso por metro cuadrado de fragmentos de microplásticos presentes en cuatro playas arenosas de la costa peruana. Las muestras fueron colectadas entre junio de 2014 y mayo 2015. Fragmentos de plástico duro mayores a 1 mm fueron encontrados en más del 80% de las muestras de las cuatro playas. La playa Costa Azul (~ 12°S presentó 522 fragmentos por metro cuadrado (items/m2 de microplásticos, de los cuales, 463.33 items/m2 y 2.6 g/m2 fueron plásticos duros. La playa Albúfera de Medio Mundo (~ 11°S presentó el menor número y peso de microplásticos (4.67 items/m2 y 0.50 g/m2. Una muestra aleatoria de la playa Costa Azul fue analizada por el espectroscopio FT-IR. Se encontró 5 fragmentos con poliuretano (PE, dos fragmentos con polipropileno (PP y un fragmento con estireno (EPS. Pocos estudios mencionan al plástico duro como la mayor fracción de los microplásticos, se sugiere nuevas fuentes de intrusión y vías de microbasura en los hábitas, los cuales podrían estar afectando desde la base de trama trófica marina en el Perú.

Groundwater recharge in desert playas: current rates and future effects of climate change

Science.gov (United States)

Our results from playas, which are topographic low areas situated in closed-catchments in drylands, indicated that projected climate change in Southwestern USA would have a net positive impact over runon and groundwater recharge beneath playas. Expected increased precipitation variability can cause ...

Mineralogical data on angelaite, Cu2AgPbBiS4, from the Los Manantiales District, Chubut, Argentina

DEFF Research Database (Denmark)

Topa, D.; Paar, W.H.; Putz, H.

2010-01-01

Angelaite, ideally Cu2AgPbBiS4, occurs as a hypogene mineral in polymetallic ores at the Ángela groups of veins in the mining district of Los Manantiales, in the province of Chubut, Argentina. The new mineral species is predominantly associated with pyrite, sphalerite, chalcopyrite, hematite...

Gestión del uso y explotación de las playas

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Víctor Yepes Piqueras

2007-01-01

Full Text Available La adopción voluntaria de sistemas de gestión de la calidad y del medio ambiente en las playas turísticas supone un cambio sustancial en el enfoque de la ordenación de los usos y la explotación de estos espacios litorales por parte de algunos municipios. Tras examinar las debilidades de la gestión habitual de las playas, se recogen y consideran las distintas normas y sistemas de gestión aplicables. Este nuevo enfoque es necesario para mantener los beneficios económicos y sociales a largo plazo que proporciona el turismo litoral. Un análisis de la evolución de los certificados de gestión en las playas de la Comunidad Valenciana permite comprobar la aplicabilidad de estos sistemas y la compatibilidad entre ellos. La gestión racional en el uso de las playas, apoyada en estos nuevos instrumentos, deberá satisfacer a todas las partes interesadas: los turistas, la población local, el medio ambiente y las generaciones futuras.

Cenomanian-? early Turonian minimum age of the Chubut Group, Argentina: SHRIMP U-Pb geochronology

Science.gov (United States)

Suárez, Manuel; Márquez, Marcelo; De La Cruz, Rita; Navarrete, César; Fanning, Mark

2014-03-01

Four new SHRIMP U-Pb zircon ages older than 93 Ma from samples of the two uppermost formations accumulated in two different depocenters (Golfo de San Jorge and Cañadón Asfalto basins) of the Chubut Group in central Argentinean Patagonia, establish a pre-late Cenomanian-? early Turonian age for the group. It also confirms a coeval and comparable evolution of the two depocenters, where distal pyroclastic material was deposited together with fluvial and lacustrine facies.

Nocturnal feeding under artificial light conditions by Brown-hooded Gull (Larus maculipennis) in Puerto Madryn harbour (Chubut Province, Argentina)

NARCIS (Netherlands)

Leopold, M.F.; Philippart, C.J.M.; Yorio, P.

2010-01-01

This paper describes nocturnal, marine feeding behaviour in the Brown-hooded Gull (Larus maculipennis) in November 2009. The gulls assembled at night at the end of a long pier, running 800 m offshore into the Golfo Nuevo, at Puerto Madryn, Chubut Province, Argentina. Powerful lights predictably

Dust emission at Franklin Lake Playa, Mojave Desert (USA): Response to meteorological and hydrologic changes 2005-2008

Science.gov (United States)

Reynolds, Richard L.; Bogle, Rian; Vogel, John; Goldstein, Harland L.; Yount, James

2009-01-01

Playa type, size, and setting; playa hydrology; and surface-sediment characteristics are important controls on the type and amount of atmospheric dust emitted from playas. Soft, evaporite-rich sediment develops on the surfaces of some Mojave Desert (USA) playas (wet playas), where the water table is shallow (monitored between March 2005 and April 2008. The dust record, based on day-time remote digital camera images captured during high wind, and compared with a nearby precipitation record, shows that aridity suppresses dust emission. High frequency of dust generation appears to be associated with relatively wet periods, identified as either heavy precipitation events or sustained regional precipitation over a few months. Several factors may act separately or in combination to account for this relation. Dust emission may respond rapidly to heavy precipitation when the dissolution of hard, wind-resistant evaporite mineral crusts is followed by the development of soft surfaces with thin, newly formed crusts that are vulnerable to wind erosion and (or) the production of loose aggregates of evaporite minerals that are quickly removed by even moderate winds. Dust loading may also increase when relatively high regional precipitation leads to decreasing depth to the water table, thereby increasing rates of vapor discharge, development of evaporite minerals, and temporary softening of playa surfaces. The seasonality of wind strength was not a major factor in dust-storm frequency at the playa. The lack of major dust emissions related to flood-derived sediment at Franklin Lake playa contrasts with some dry-lake systems elsewhere that may produce large amounts of dust from flood sediments. Flood sediments do not commonly accumulate on the surface of Franklin Lake playa because through-going drainage prevents frequent inundation and deposition of widespread flood sediment.

Gypsum ground: a new occurrence of gypsum sediment in playas of central Australia

Science.gov (United States)

Xiang Yang Chen; Bowler, James M.; Magee, John W.

1991-06-01

There are many playas (dry salt lakes) in arid central Australia (regional rainfall about 250 mm/y and pan evaporation around 3000 mm/y). Highly soluble salts, such as halite, only appear as a thin (several centimetres thick), white, ephemeral efflorescent crust on the dry surface. Gypsum is the major evaporite precipitating both at present and preserved in sediment sequences. One type of gypsum deposit forms a distinctive surface feature, which is here termed "gypsum ground". It consists of a thick (up to 80 cm) gypsum zone which rises from the surrounding smooth white playa surface and is overlain by a heaved brown crust. The gypsum zone, with an average gypsum content above 60%, consists of pure gypsum sublayers and interlayered clastic bands of sandy clay. The gypsum crystals are highly corroded, especially in the direction parallel to the c-axis and on the upper sides where illuviated clay has accumulated in corrosion hollows. Overgrowth parallel to the a- and b-axes is very common, forming highly discoidal habits. These secondary changes (corrosion and overgrowth) are well-developed in the vadose zone and absent from crystals below the long-term watertable (depth around 40 cm). These crystal characteristics indicate a rainwater leaching process. At Lake Amadeus, one of the largest playas (800 km 2) of central Australia, such gypsum ground occupies 16% of the total area. The gypsum ground is interpreted as an alteration of a pre-existing gypsum deposit which probably extended across the whole playa before breaking down, leaving a playa marginal terrace and several terrace islands within the gypsum ground. This pre-existing gypsum deposit, preserved in the residual islands, consists of pure, pale, sand-sized lenticular crystals. It is believed to have been deposited during an episode of high regional watertable, causing active groundwater seepage and more frequent surface brine in the playa. A later fall in watertable, probably resulting from climatic change

Bacterial succession within an ephemeral hypereutrophic mojave desert playa lake

Science.gov (United States)

Navarro, J.B.; Moser, D.P.; Flores, A.; Ross, C.; Rosen, Michael R.; Dong, H.; Zhang, G.; Hedlund, B.P.

2009-01-01

Ephemerally wet playas are conspicuous features of arid landscapes worldwide; however, they have not been well studied as habitats for microorganisms. We tracked the geochemistry and microbial community in Silver Lake playa, California, over one flooding/desiccation cycle following the unusually wet winter of 2004-2005. Over the course of the study, total dissolved solids increased by 10-fold and pH increased by nearly one unit. As the lake contracted and temperatures increased over the summer, a moderately dense planktonic population of 1 ?????106 cells ml-1 of culturable heterotrophs was replaced by a dense population of more than 1????????109 cells ml-1, which appears to be the highest concentration of culturable planktonic heterotrophs reported in any natural aquatic ecosystem. This correlated with a dramatic depletion of nitrate as well as changes in the microbial community, as assessed by small subunit ribosomal RNA gene sequencing of bacterial isolates and uncultivated clones. Isolates from the early-phase flooded playa were primarily Actinobacteria, Firmicutes, and Bacteroidetes, yet clone libraries were dominated by Betaproteobacteria and yet uncultivated Actinobacteria. Isolates from the late-flooded phase ecosystem were predominantly Proteobacteria, particularly alkalitolerant isolates of Rhodobaca, Porphyrobacter, Hydrogenophaga, Alishwenella, and relatives of Thauera; however, clone libraries were composed almost entirely of Synechococcus (Cyanobacteria). A sample taken after the playa surface was completely desiccated contained diverse culturable Actinobacteria typically isolated from soils. In total, 205 isolates and 166 clones represented 82 and 44 species-level groups, respectively, including a wide diversity of Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes, Gemmatimonadetes, Acidobacteria, and Cyanobacteria. ?? 2008 Springer Science+Business Media, LLC.

Depositional history and climate change in the Quaternary sequence of Meyghan playa

Directory of Open Access Journals (Sweden)

مصطفی یوسفی‎راد

2015-04-01

Full Text Available To study, 30 sediment samples were collected from the 7 boreholes with maximum depth 520 cm in the Meyghan playa bed which is located in 15 km northeastern part of Arak. Sediment samples were studied for sedimentological characteristic include mineralogy, granolometry, calcimetery, organic matter content, pH, EC and physical characteristics of sediments. Meyghan playa sediments are mostly of chemicals and detrital. Percentage of evaporative minerals in surface sediments is greater than the clastic minerals. Sediments of this playa are mainly chemical (evaporites and clastic components. Amount of evaporative minerals in surface sediments is greater than the clastic minerals. This study shows, Chemical sediments are formed Mainlyو during periods of low water levels and sometimes, the lake is fed from the land. While castic sediments of the basin were deposited during periods of high water levels and transported by rivers and floods as bed load and suspended load to playa and deposited. Considering sedimentology and mineralogy profiles with depth despite visible fluctuations due to climate change (dry and wet seasons, indicative almost regular process of parameters along the borehole. So that with depth abundance of detrital minerals, calcium carbonate, and mean of grain size is increased while organic matter and mean of grain’s sorting is decreased. These factors along with the reduction of evaporative minerals with depth, especially minerals with high solubility such as gypsum and Halite indicate there was a high water level and cold - humid climate for the past (late Pleistocene in the Meighan playa and/or maybe there is a lake with fresh water or Low salinity in the past that its salinity has increased over time.

Depositional history and climate change in the Quaternary sequence of Meyghan playa

Directory of Open Access Journals (Sweden)

Leila Abdi

2015-05-01

Full Text Available To study, 30 sediment samples were collected from the 7 boreholes with maximum depth 520 cm in the Meyghan playa bed which is located in 15 km northeastern part of Arak. Sediment samples were studied for sedimentological characteristic include mineralogy, granolometry, calcimetery, organic matter content, pH, EC and physical characteristics of sediments. Meyghan playa sediments are mostly of chemicals and detrital. Percentage of evaporative minerals in surface sediments is greater than the clastic minerals. Sediments of this playa are mainly chemical (evaporites and clastic components. Amount of evaporative minerals in surface sediments is greater than the clastic minerals. This study shows, Chemical sediments are formed Mainlyو during periods of low water levels and sometimes, the lake is fed from the land. While castic sediments of the basin were deposited during periods of high water levels and transported by rivers and floods as bed load and suspended load to playa and deposited. Considering sedimentology and mineralogy profiles with depth despite visible fluctuations due to climate change (dry and wet seasons, indicative almost regular process of parameters along the borehole. So that with depth abundance of detrital minerals, calcium carbonate, and mean of grain size is increased while organic matter and mean of grain’s sorting is decreased. These factors along with the reduction of evaporative minerals with depth, especially minerals with high solubility such as gypsum and Halite indicate there was a high water level and cold - humid climate for the past (late Pleistocene in the Meighan playa and/or maybe there is a lake with fresh water or Low salinity in the past that its salinity has increased over time.

Megadesarrollos turísticos de sol y playa enclaves del imaginario

OpenAIRE

Rodríguez González, Sylvia Cristina

2009-01-01

Los megadesarrollos turísticos de sol y playa han sido impulsados por el Banco Interamericano de Desarrollo (BID) como proyectos de estrategia de desarrollo turístico, en México nacen los Centros Integralmente Planeados (CIP´s) para dar orden urbano, descentralizando grandes inversiones turísticas principalmente de origen extranjeros. Son identificados ante la promoción turística por la inversión de insumos y tecnología. Los emplazamientos turísticos de sol y playa han crecido y destina...

Influence of land use on metal concentrations in playa sediments and amphibians in the Southern High Plains

Energy Technology Data Exchange (ETDEWEB)

Venne, Louise S. [Department of Environmental Toxicology, Institute of Environmental and Human Health, Texas Tech University, MS 1163, Lubbock, TX 79409 (United States)]. E-mail: louise.venne@tiehh.ttu.edu; Cobb, George P. [Department of Environmental Toxicology, Institute of Environmental and Human Health, Texas Tech University, MS 1163, Lubbock, TX 79409 (United States); Coimbatore, Gopal [Department of Environmental Toxicology, Institute of Environmental and Human Health, Texas Tech University, MS 1163, Lubbock, TX 79409 (United States); Smith, Loren M. [Wildlife and Fisheries Management Institute, Texas Tech University, MS 2125, Lubbock, TX 79409 (United States); McMurry, Scott T. [Department of Environmental Toxicology, Institute of Environmental and Human Health, Texas Tech University, MS 1163, Lubbock, TX 79409 (United States)

2006-11-15

The Southern High Plains (SHP) is a semi-arid region in which playa wetlands are the focal points of biodiversity. Playas are highly influenced by surrounding land use. Most of the SHP is in agricultural production (primarily cotton) with a history of arsenic-containing herbicide use. Metals influence reproduction and development in amphibians. We analyzed metal residues in playa sediment and whole body tissue of Spea spp. and Bufo cognatus metamorphs from two land uses: cropland and native grassland. Cd and Ni concentrations in B. cognatus tissues differed between land uses. Metal concentrations in Spea spp. tissues did not differ between land uses. Ba was higher in Spea spp. than B. cognatus collected from the same grassland playas, indicating differential habitat use. No correlations between sediment and tissue concentrations were found. Land use appeared to have little influence on metal concentrations and levels were below those known to cause effects in amphibians. - Land use surrounding playas has little effect on metal concentrations in sediments.

sol y playa: el caso de Tenerife

Directory of Open Access Journals (Sweden)

Ricardo J. Díaz Armas

2008-01-01

Full Text Available El turismo del vino tiene una concepción distinta en un destino masivo de sol y playa. En este caso el enoturismo convive con ese modelo turístico y es un producto complementario que favorece la diversificación en la oferta actual. El turismo del vino puede complementar la ya existente oferta turística, con lo que las regiones, turísticas y a la vez viníferas, podrían apoyarse en las experiencias y conocimiento del vino por parte del visitante y utilizarlas como hecho diferencial competitivo frente a otros destinos de sol y playa que no poseen esta particularidad. Con ello además se favorecerá el lanzamiento del producto turístico del vino, pues la demanda latente ya esta en las zonas turísticas que rodean el área vinícola. En este sentido, una vez que se descubren las motivaciones para acudir al destino Tenerife, se localiza un mercado sensible a la ruta del vino Tacoronte-Acentejo en el asentamiento turístico del Puerto de la Cruz (una de las principales zonas turísticas de Tenerife. Así, tras conocer los beneficios buscados por el visitante del Puerto de la Cruz, se ha contrastado la existencia de dos segmentos latentes que pueden ser atraídos hacia la oferta actual de la ruta del vino en Tacoronte-Acentejo, al verificar que persiguen, además del clima y el sol y playa (principales motivaciones para viajar al destino Tenerife, otros beneficios que son susceptibles de ser ofertados por la ruta del vino.

Modeling sediment accumulation in North American playa wetlands in response to climate change, 1940-2100

Science.gov (United States)

Burris, Lucy; Skagen, Susan K.

2013-01-01

Playa wetlands on the west-central Great Plains of North America are vulnerable to sediment infilling from upland agriculture, putting at risk several important ecosystem services as well as essential habitats and food resources of diverse wetland-dependent biota. Climate predictions for this semi-arid area indicate reduced precipitation which may alter rates of erosion, runoff, and sedimentation of playas. We forecasted erosion rates, sediment depths, and resultant playa wetland depths across the west-central Great Plains and examined the relative roles of land use context and projected changes in precipitation in the sedimentation process. We estimated erosion with the Revised Universal Soil Loss Equation (RUSLE) using historic values and downscaled precipitation predictions from three general circulation models and three emissions scenarios. We calibrated RUSLE results using field sediment measurements. RUSLE is appealing for regional scale modeling because it uses climate forecasts with monthly resolution and other widely available values including soil texture, slope and land use. Sediment accumulation rates will continue near historic levels through 2070 and will be sufficient to cause most playas (if not already filled) to fill with sediment within the next 100 years in the absence of mitigation. Land use surrounding the playa, whether grassland or tilled cropland, is more influential in sediment accumulation than climate-driven precipitation change.

The impact of climate and composition on playa surface roughness: Investigation of atmospheric mineral dust emission mechanisms

Science.gov (United States)

Tollerud, H. J.; Fantle, M. S.

2011-12-01

Atmospheric mineral dust has a wide range of impacts, including the transport of elements in geochemical cycles, health hazards from small particles, and climate forcing via the reflection of sunlight from dust particles. In particular, the mineral dust component of climate forcing is one of the most uncertain elements in the IPCC climate forcing summary. Mineral dust is also an important component of geochemical cycles. For instance, dust inputs to the ocean potentially affect the iron cycle by stimulating natural iron fertilization, which could then modify climate via the biological pump. Also dust can transport nutrients over long distances and fertilize nutrient-poor regions, such as island ecosystems or the Amazon rain forest. However, there are still many uncertainties in quantifying dust emissions from source regions. One factor that influences dust emission is surface roughness and texture, since a weak, unconsolidated surface texture is more easily ablated by wind than a strong, hard crust. We are investigating the impact of processes such as precipitation, groundwater evaporation, and wind on surface roughness in a playa dust source region. We find that water has a significant influence on surface roughness. We utilize ESA's Advanced Synthetic Aperture Radar (ASAR) instrument to measure roughness in the playa. A map of roughness indicates where the playa surface is smooth (on the scale of centimeters) and potentially very strong, and where it is rough and might be more sensitive to disturbance. We have analyzed approximately 40 ASAR observations of the Black Rock Desert from 2007-2011. In general, the playa is smoother and more variable over time relative to nearby areas. There is also considerable variation within the playa. While the playa roughness maps changed significantly between summers and between observations during the winters, over the course of each summer, the playa surface maintained essentially the same roughness pattern. This suggests that

Gravimetric model of the Gastre trough, province of Chubut, Argentina; Modelo gravimetrico en la fosa de Gastre, provincia de Chubut, Argentina

Energy Technology Data Exchange (ETDEWEB)

Lince Klinger, F.; Nacif, S.; Martinez, M. P.; Gimenez, M. E.; Ruiz, F.; Alvarez, O.

2011-07-01

A gravimetric study of the Gastre trough in the Province of Chubut, to the southwest of the Canadon Asfalto basin, has allowed us to determine the geometry of its crystalline basement. Using filtering techniques we were able to map residual Bouguer anomalies, which show the heterogeneities situated within the upper crust, some of which are linked to recognised geological structures. The gravimetric minima in the residual Bouguer anomaly map are associated with graben-type basins, flanked by positive gravity values associated with alignments identified on the surface and with the overall topographic relief of the Gastre trough. After suitable treatment of the density values of the outcrops and seismic data we were able to construct a 2D density model, perpendicular to the trough, which indicated a depth of 3600 m. The importance of this study lies in the fact that it has been possible to arrive at a gravimetric characterization of the Gastre trough in the Canadon Asfalto basin sector, a potentially hydrocarbon-bearing area hitherto lacking in reliable data concerning its subsoil. (Author)

A ‘política do lugar’: a Comuna afrodescendente Playa de Oro, Esmeraldas - Equador

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Janaina Lobo

2015-03-01

Full Text Available The ‘politics of the place’: the Playa de Oro Afro Commune, Esmeraldas - Ecuador Abstract The article deals with the territorial arrangements of the Playa de Oro Afro Commune, located in Esmeraldas, near the Colombian-Ecuadorian border. Located on the banks of the Rio Santiago, in the limits of the Cotacachi-Cayapas Ecological Reserve, Playa de Oro has emblematic paradigms in land management, which point to other cultural models about ‘nature’, its uses and reserves. Through a reflection on the “prospects of inhabiting”, the goal is understanding the ecology of life, which deals with these crucial processes of historical commitment to the landscape. This proposal seeks to understand the conceptual frameworks operated by the local inhabitants in the land management, translated into a an active political ecology. These efforts are significant to comprehend the processes performed by the Playa de Oro inhabitants to reverse the invisibilization logic of the Afro-descendants in Latin America and restrain the usurpation of their natural resources.

Monitoreo de tortugas marinas Lepidochelis olivaceae (paslama en playa La Flor - Rivas

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Celia María Gutiérrez

1999-12-01

Full Text Available La tortuga marina Lepidochelis olivaceae desova en forma masiva, solamente en seis playas del mundo. Nicaragua cuenta con dos de estas playas en los sitios geográficos llamados ' “Chacocente", en el Departamento de Carazo y "La Flor", en San Juan del Sur. Esta especie de tortuga se caracteriza por presentar un movimiento sincronizado para su anidación en la playa, el cual se ha denominado arribadas. Durante 5 años consecutivos se realizó en el refugio de vida silvestre "La Flor", un monitoreo de la población anidante y se encontró que cada año durante el período de julio a enero, visitan esta playa aproximadamente, 3,000 a 12,000 tortugas, reportándose entre septiembre y octubre el pico más alto de la población anidante. Paralelo a este estudio, se realizó un diagnóstico rápido en las comunidades aledañas al refugio, el cual refleja que es una práctica tradicional de los pobladores, la extracción de huevos de tortuga para el consumo de la familia y para el comercio. Se considera, sin embargo, que esta práctica no representa económicamente una dependencia absoluta, ya que la población tiene otros tipos de actividades agropecuarias que contribuyen a su subsistencia.

Investigationof Clay Mineralogy, Micromorphology and Evolution of Soils in Bajestan Playa

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Mohammad Ghasemzadeh Ganjehie

2017-03-01

Full Text Available Introduction: Playa is one of the most important landscapes in arid regions which covers about 1% of the world's total land area. Study of playas is important from different points of view especially pedology, sedimentology, mineralogy, environmental geology, groundwater and surface water chemistry. More than 60 playas have been identified in Iran. Considering the fact that playas and surrounding landforms are important archive of landscape evolution and paleoenvironmental variations, it seems that less attention has been paid to them so far. Soils are known as indicators of the landscapes evolution. Previous studies in arid regions of Iran imply different periods of deposition and soil formation in playa and alluvial fans or pediments. Bajestan playa is one of the known playa in northeastern Iran, and the largest clay flat exists in this playa. There is no information on the soils and their evolution in Bajestan playa. The objective of this study were to 1 identify the soils in different landforms along a transect from alluvial fan to clay in Bajestan playa 2 determine the morphological, micromorphological and mineralogical characteristics of these soils 3 determine the periods of soil and landform evolution and 4 comparison of soils evolution of the study area to other arid regions of Iran. Material and Methods: The study area of approximately 20000 hectares is located in southeastern of KhorasanRazavi province. The climate of the study area is hot and dry with mean annual temperature and rainfall of 17.3 °C and 193 mm, respectively. Soil moisture regime is aridic with subdivisions of weak aridic and soil temperature regime is thermic. Firstly, landforms and geomorphic surfaces of the study area were recognized based on Google Earth images interpretations and field observations. Four main landforms were recognized in the study area. The landforms from north to the south of the study area were alluvial fan, intermediate alluvial fan- clay flat

LA EROSIÓN HISTÓRICA DE LA PLAYA DE SA RÀPITA (S. MALLORCA

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José Ángel Martín Prieto

2016-01-01

Full Text Available La evolución morfosedimentaria de la playa de sa Ràpita (Sur de Mallorca se ha visto afectada a partir de la construcción, en 1977, del puerto deportivo ubicado en su extremo NO. La consecuencia más importante ha sido la modificación de la deriva litoral, ya que el puerto actúa como trampa sedimentaria. Este hecho impide que el sedimento pueda distribuirse a lo largo de la playa, como ocurría antes de su construcción. La playa ha sufrido procesos erosivos importantes a partir de 1977 hasta la actualidad. Así, a partir de esa fecha, el sector más próximo al puerto deportivo ha aumentado su superficie con una media de 0.5 m/a, mientras que el resto de la playa se erosiona con una media de entre -0.19 y -0.34 m/a. El estudio se ha realizado con la ayuda de un Sistema de Información Geográfica y con la herramienta Digital Shoreline Analysis System, que permite cuantificar los procesos erosivos a lo largo de un periodo comprendido entre los años 1956 y 2012.

HOTELES DE TRELEW (CHUBUT, ARGENTINA) HACIA EL DESARROLLO SUSTENTABLE DE LA ACTIVIDAD CON RESPONSABILIDAD SOCIAL

OpenAIRE

Ana M. Gómez; María Elena Sendín

2008-01-01

El trabajo se enmarca en el Proyecto de Investigación “Hotelería Sustentable en la Ciudad de Trelew, Provincia del Chubut, República Argentina” cuyo objetivo general es diseñar un sistema de Administración para la hotelería de Trelew, que viabilice su gestión en el marco del desarrollo sustentable de la actividad hotelera. Como hipótesis de trabajo se supuso que la hotelería estaría en condiciones de tener una gestión sustentable cuando demostrara poseer una cultura empresarial dirigida al...

Cuantificando la incertidumbre: aplicación a la línea de playa

OpenAIRE

Payo, Andrés; Baquerizo, Asunción; Losada, Miguel Ángel

2004-01-01

A priori no es posible conocer con certeza la forma en planta de un tramo de playa, debido principalmente al desconocimiento del clima marítimo al que estará sometido. En este trabajo se presenta un procedimiento de cálculo cuyo objetivo es el de cuantificar de forma objetiva la incertidumbre asociada a la predicción de la evolución de la línea de playa en términos de probabilidad. A partir de una base de datos oceanográficos y basados en los principios de las funciones ortogonales empíricas ...

Causas y efectos de un destino no sustentable: Caso playas públicas de Cancún, Quintana Roo

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Christine Elizabeth Mc Coy Cador

2016-01-01

Full Text Available Un desarrollo urbano desordenado es uno de los mayores inconvenientes a los que se enfrentan los destinos turísticos. En Cancún, Quintana Roo, dicha anarquía se refleja, entre otras cosas, en la pérdida constante de playas públicas, no sólo por problemas de erosión, sino por la manipulación de usos de suelo. Aunado a lo anterior, se encuentra el modelo hotelero que exige la concesión para construir a pie de playa, así como la autorización de uso casi privado de la misma. Este esquema ha sido replicado en otros destinos, imposibilitando con ello a la población local de su disfrute para entretenimiento, pero las empresas hoteleras no se responsabilizan del mantenimiento cuando éstas se ven afectadas por fenómenos meteorológicos. El presente trabajo realiza una evaluación de lo que estaba programado como playas públicas de acuerdo al Plan Maestro de 1982, su evolución, para contrastarlo con lo que en la actualidad existe, después de un levantamiento de datos en todas las playas públicas y la revisión de los sucesivos Planes de Desarrollo Urbano. El resultado de dicho levantamiento muestra que el destino ha pérdido cerca del 91% de sus playas públicas, lo que permite señalar que ha rebasado su capacidad de carga turística.

Geohydrology and evapotranspiration at Franklin Lake Playa, Inyo County, California

Energy Technology Data Exchange (ETDEWEB)

NONE

1990-12-01

Franklin Lake playa is one of the principal discharge areas of the Furnace Creek Ranch-Alkali Flat ground-water-flow system in southern Nevada and adjacent California. Yucca Mountain, Nevada, located within this flow system, is being evaluated by the US Department of Energy to determine its suitability as a potential site for a high-level nuclear-waste repository. To assist the US Department of Energy with its evaluation of the Yucca Mountain site, the US Geological Survey developed a parameter-estimation model of the Furnace Creek Ranch-Alkali Flat ground-water-flow system. Results from sensitivity analyses made using the parameter-estimation model indicated that simulated rates of evapotranspiration at Franklin Lake playa had the largest effect on the calculation of transmissivity values at Yucca Mountain of all the model-boundary conditions and, therefore, that evapotranspiration required careful definition. 72 refs., 59 figs., 26 tab.

Geohydrology and evapotranspiration at Franklin Lake Playa, Inyo County, California

International Nuclear Information System (INIS)

1990-01-01

Franklin Lake playa is one of the principal discharge areas of the Furnace Creek Ranch-Alkali Flat ground-water-flow system in southern Nevada and adjacent California. Yucca Mountain, Nevada, located within this flow system, is being evaluated by the US Department of Energy to determine its suitability as a potential site for a high-level nuclear-waste repository. To assist the US Department of Energy with its evaluation of the Yucca Mountain site, the US Geological Survey developed a parameter-estimation model of the Furnace Creek Ranch-Alkali Flat ground-water-flow system. Results from sensitivity analyses made using the parameter-estimation model indicated that simulated rates of evapotranspiration at Franklin Lake playa had the largest effect on the calculation of transmissivity values at Yucca Mountain of all the model-boundary conditions and, therefore, that evapotranspiration required careful definition. 72 refs., 59 figs., 26 tab

Programa provincial de lectura del Chubut

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Natalia Alejandra Alaniz

2014-10-01

Full Text Available En el marco del proyecto “Dispositivos pedagógicos en las dinámicas de lavida escolar en contexto de pobreza urbana” lo que se propuso investigar es la forma de implementación del Programa de Lectura de la provincia de Chubut. El mismo fue creado por Resolución Ministerial N° 1044/ 08, a partir de diversos trabajos que comenzaron en el año 2003 a través de la Ley de Educación 26. 026, y que posteriormente se incorporaron a nivel provincial mediante la Resolución N ° 174/12 para revalorizar las trayectorias escolares de cada niño/a. El programa consiste en poner el énfasis en el vínculo pedagógico mediante la adecuación de los espacios curriculares, de tal modo que se pueda lograr una articulación entre los diferentes niveles educativos, desde el nivel inicial al secundario. Articulando para ello recursos materiales y humanos que posibiliten el acompañamiento del proceso de enseñanza y aprendizaje de lectura.A partir de esto, el objetivo de este trabajo fue indagar cómo perciben los docentes de una escuela pública la implementación del Programa Provincial de Lectura, lo que implico utilizar metodologías y técnicas de investigación apropiadas para obtener las experiencias actuales en el territorio y en la cotidianidad de los propios actores escolares. Teniendo en consideración que el dispositivo pedagógico es una construcción histórica, que produce subjetividades, y por consiguiente formas de ver y entender el mundo.

Depositional and diagenetic processes of Qa Khanna playa, North Jordan basaltic plateau, Jordan

Science.gov (United States)

Howari, F. M.; Banat, K. M.; Abu-Salha, Y. A.

2010-09-01

The present study explored mineral occurrences and sediment characteristics of playas from northern Jordan and explained depositional and diagenetic processes as reflected from bulk chemistry and sedimentary structures. Mudcracks of different sizes and shape patterns, laminations, intersediment vesicles, and bioturbation pipes are the main sedimentary structures. Plagioclase, olivine, orthopyroxene, nepheline and other opaque minerals are all of detrital origin, and are derived from the basaltic bedrocks surrounding the studied playa. Evaporites are very rare; they are represented only by trace amounts of gypsum. The identified clay minerals in the clay fraction of the studied sediments, arranged according to their decreasing abundances are palygorskite, illite, kaolinite, smectite and chlorite. The elemental abundances were tied to clay, CaCO 3 and nearby igneous rocks. The type of clay minerals, the high pH values of the studied sediments, and the considerable incorporation of Mg and K in palygorskite and illite respectively, may strongly reflect a high evaporative and alkaline environment under arid to semi-arid conditions in an ephemeral lake of the Qa Khanna. Concentrations and distributions of both major and trace elements are essentially controlled by the clay mineralogy and the calcium carbonate content; Ca is mainly incorporated in the CaCO 3, which is either generated authigenically or by aeolian deposition. Fe and K are incorporated and fixed by illite under an evaporative and alkaline environment. Mg is incorporated in palygorskite while Mn is adsorbed on various clay minerals. Sr substitutes for Ca in the aeolian CaCO 3 and its presence in the studied sediments is independent of the prevailing conditions during the playa evolution. Rb substitutes for K in illite under the prevailing chemical conditions in the studied playa.

Hydrogeological behaviour of the Fuente-de-Piedra playa lake and tectonic origin of its basin (Malaga, southern Spain)

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Rodriguez-Rodriguez, Miguel; Martos-Rosillo, Sergio; Pedrera, Antonio

2016-12-01

Changes in the quantity of groundwater input due to water extraction for irrigation and urban supply has modified the water balance in the Fuente de Piedra playa lake. We have analysed the hydrogeology of the playa-lake system and developed a water-level model by means of a simple long-term water balance and piezometric analysis. In addition, a tectonic model is proposed to explain the endorheic basin development that led to the formation of the playa. Upright folds developed since the late Miocene and density-driven subsidence favoured the setting-up of and endorheic system located between the Atlantic and the Mediterranean basins in the Quaternary. The underlying low permeability rocks beneath the playa form a very stable aquitard with highly saline groundwater that prevents groundwater recharge of the lake into the aquitard. The hydrological modelling allowed us to simulate the evolution of the wáter level under a scenario of unaltered conditions during a 13-year period, showing that the percentage of days with dry conditions varies from 24.8% of the time under altered conditions to 14.9% as far as an unaltered scenario is concerned.

Relevamientos semicuantitativo para el estudio de la morfología de playa

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Angel Marcos

2009-12-01

Full Text Available El cambio climático global y sus efectos sobre las ambientalmente sensibles áreas costeras han llevado, tanto a los organismos científicos como económicos, a poner en ejecución planes de manejo costero. Un punto débil de este esquema es la falta de datos estadísticos, sobre todo en países del llamado Tercer Mundo, que por sus características económicas no destinan fondos para este tipo de estudio. Es por ello interesante ejecutar metodologías de relevamiento de bajo costo, accesibles aún a personas con escaso conocimiento técnico para obtener resultados que puedan servir para resolver esta problemática. Es así que se hicieron experiencias con una metodología basada en un relevamiento semicuantitativo de playas, adaptado a las condiciones del medio en la costa de Monte Hermoso. En dicha localidad, en base a estudios previos se posee un conocimiento de sus materiales y su dinámica, tanto de la playa como del mar y de su clima. Periódicamente, con un relevamiento expeditivo se pueden realizar perfiles topográficos de playa, mientras que observaciones oceanográficas y climáticas con métodos convencionales, son importantes para la comprensión de los procesos costeros que generan las variaciones morfológicas de la playa. La metodología se basa en un relevamiento descriptivo semicuantitativo, que brinda un caudal de información confiable y permite inferir el comportamiento de la playa en función del tiempo. Se realizan bosquejos topográficos de sectores definidos de la playa, volcando la información con una simbología preestablecida, indicando la orientación de barras, canales, afloramientos, corrientes de flujo, etc. Las dimensiones son estimadas según una grilla métrica. La grilla referenciada se construye con elementos de fácil reconocimiento, presentes en la costa, las que luego se identifican en campañas sucesivas a los efectos de comparar los cambios sufridos por la playa durante un período determinado. Los

Visible and near-infrared (0.4-2.5 μm) reflectance spectra of playa evaporite minerals

Science.gov (United States)

Crowley, James K.

1991-01-01

Visible and near-infrared (VNIR; 0.4–2.4 μm) reflectance spectra were recorded for 35 saline minerals that represent the wide range of mineral and brine chemical compositions found in playa evaporite settings. The spectra show that many of the saline minerals exhibit diagnostic near-infrared absorption bands, chiefly attributable to vibrations of hydrogen-bonded structural water molecules. VNIR reflectance spectra can be used to detect minor hydrate phases present in mixtures dominated by anhydrous halite or thenardite, and therefore will be useful in combination with X ray diffraction data for characterizing natural saline mineral assemblages. In addition, VNIR reflectance spectra are sensitive to differences in sample hydration state and should facilitate in situ studies of minerals that occur as fragile, transitory dehydration products in natural salt crusts. The use of spectral reflectance measurements in playa studies should aid in mapping evaporite mineral distributions and may provide insight into the geochemical and hydrological controls on playa mineral and brine development.

Paleoclimatology of Upper Triassic Playa Cycles. New Insights Into an Orbital Controlled Monsoon System (Norian, German Basin)

OpenAIRE

Vollmer, Thorsten

2005-01-01

Paleoclimatology of Upper Triassic Playa Cycles: New Insights Into an Orbital Controlled Monsoon System (Norian, German Basin) Abstract The main purpose of the project was to study the rhythmic sediments of the Steinmergel Keuper playa system in the North and South German basin in order to test the hypothesis of possible climate control on sedimentation. Furthermore, in case of there being orbital control on sedimentation, the North/South correlation was tested based on high-resolution cyclos...

METODOLOGÍA DE CÁLCULO DE LA CAPACIDAD DE CARGA TURÍSTICA COMO HERRAMIENTA PARA LA GESTIÓN AMBIENTAL Y SU APLICACIÓN EN CINCO PLAYAS DEL CARIBE NORTE COLOMBIANO

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BOTERO SALTARÉN CAMILO

2010-05-01

Full Text Available Este artículo presenta una metodología para medir la capacidad de carga en playas turísticas, más allá del solo componente ambiental. Además, concibe la playa como un sistema complejo en movimiento hacia su desarrollo sostenible. Se seleccionaron y clasificaron cinco playas del Caribe Norte Colombiano, a través de cuatro sub- usos turísticos: intensivo, de conservación, compartido y étnico. Con revisiones normativas, trabajo de campo y diseño de indicadores, se analizaron el soporte ambiental, el equipamiento urbano y los servicios conexos de las playas. Como resultado se estableció un nuevo modelo para medir la capacidad de carga en playas turísticas y se aplicó en las playas de estudio. También se presentan las condiciones actuales de las playas de estudio, su capacidad de carga turística actual y algunas acciones de manejo en cada componente. La principal conclusión se dirige a integrar las condiciones naturales como factor central de la gestión de playas, pero desde un enfoque holístico en el proceso de toma de decisiones. Finalmente, se pone en alerta frente a las condiciones de las playas colombianas y las medidas a tomar en el corto y mediano plazo. Este documento es el resultado del proyecto “Determinación de un sistema de calificación y certificación de playas turísticas”.

Detrital zircon geochronology and provenance of the Chubut Group in the northeast of Patagonia, Argentina

Science.gov (United States)

Navarro, Edgardo L.; Astini, Ricardo A.; Belousova, Elena; Guler, M. Verónica; Gehrels, George

2015-11-01

The Chubut Group constitutes the most widespread sedimentary unit in NE Patagonia, characterized by variable-energy fluvial deposits. U-Pb analysis of detrital zircons from two sections of the Chubut Group constraint the age of the oldest sedimentary rocks in the northeast of the Somuncurá - Cañadón Asfalto Basin. In the Cañadón Williams area, at San Jorge section, 20 km NW of Telsen locality, dating of 56 detrital zircons from a medium to coarse sandstone indicated a maximum depositional age of 109 ± 1 Ma (n = 4). These sandstones were interpreted to represent shallow channels, associated with a lacustrine system. In the Telsen locality, a laser ablation analysis of 115 detrital zircons from a medium to coarse-grained sandstone, from fluvial channel facies, yielded a maximum depositional age of ca. 106 ± 1 Ma (n = 8). Both ages are consistent with volcanic events of the Barremian to Albian age in the central Patagonian Andes Region. Cathodoluminescence images of zircons from the San Jorge sample suggest an igneous origin, which is further supported by Th/U values above 0.5 in most of the grains. The distribution of the statistical modes of the main age populations of detrital zircons for the two samples [182, 185 and 189 Ma for Telsen sample (T2S) and 181 ± 1 Ma for San Jorge sample (SJS)] matches the age of the volcanic Marifil Formation. The rocks of the Marifil Formation of these ages are exposed NE to SE of the study area. The abundance of zircons of similar Jurassic ages (n = 52 for SJS and n = 105 for T2S) and the external morphology of the zircons in the sample SJS, implies a close proximity of the source area. Suggestion that the Marifil Formation was the main provenance source is also supported by northeast-southeasterly paleocurrents measured at the San Jorge and Telsen sections.

Planificación territorial y turística en destinos de sol y playa maduros

OpenAIRE

Collado Lara, Marta

2017-01-01

La investigación aborda la problemática de los destinos turísticos sol y playa de masas y maduros del litoral mediterráneo e insular español, desde la perspectiva territorial. En síntesis, la situación problemática detectada, muestra un desgobierno del territorio dominado por la planificación urbanística y pone de manifiesto una evidente falte de coordinación y cooperación entre las políticas territoriales y turísticas en la definición de un modelo de desarrollo turístico sol y playa sostenib...

Indigenous identity and textiles: an economic policy strategies in the province of Chubut La identidad indígena y sus textiles: estrategias de una política económica en la provincia de Chubut

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Patricia María Méndez

2010-01-01

Full Text Available From the conception of the identity of individuals and of the groups as an elaboration, arises that the current indigenous identity employed by the state in the province of Chubut is functional to a policy which aims to prevent the emigration of the few people in rural areas of the province. It affirms that such a strategy is not new and that in the past other versions of this identity have also been useful to legitimate power projects. Through ethnographic and historical work, we explore some physical and social characteristics of rural areas of that province, some provincial regulations of government agencies, and certain attributes, preterits and present, of the indigenous identity employed by the state and of one of its symbols, Mapuche tissues. Laterally it refers in what way this identity is considered by some identified.A partir de la concepción de la identidad de las personas y de los grupos como una elaboración, se plantea que la actual identidad indígena empleada por el Estado en la provincia de Chubut resulta funcional a una política que pretende evitar la emigración de los escasos pobladores de las zonas rurales de la provincia. Se afirma que tal estrategia no es novedosa y que en el pasado otras versiones de esa identidad también han resultado útiles a los proyectos del poder legítimo. Mediante un trabajo etnográfico e histórico, se analizan algunas características físicas y sociales de la zona rural de esa provincia, algunas normativas de organismos gubernamentales provinciales, y ciertos atributos pretéritos y actuales de la identidad indígena empleada por el Estado y de uno de sus símbolos, los tejidos mapuches. Lateralmente se refiere de qué manera esa identidad es considerada por algunos identificados.

Corrales de piedra, campos abiertos y pampas de camaruco: Memorias de relacionalidad en la meseta central de Chubut Stone yards, open fields and sacred places: Memories of relatedness in the Chubut´s central plateau

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Ana Ramos

2008-12-01

Full Text Available La "cuestión indígena" como política de estado en Argentina ha estado acompañada por la elaboración académica de mapas étnicos. Las definiciones hegemónicas de estas entidades han presupuesto generalmente algún elemento "esencial" como, por ejemplo, fenotipos, uso de una lengua, o la aglutinación en torno a linajes consanguíneos. A partir de las reformulaciones de las teorías del parentesco desde el modelo heurístico de las sociedades de casas y las teorías sobre la relacionalidad proponemos una aproximación a la memoria social como marco alternativo de interpretación histórica. Esta contempla las prácticas sociales del parentesco y la objetivación de la continuidad de los grupos de pertenencia en las políticas y lugares de la memoria -corrales de piedra, actividades productivas y pampas de camaruco- en la región de la "meseta" de Chubut. Dichas relaciones con el espacio físico cuestionan tanto las definiciones académicas tradicionales de parentesco y de cacicazgo como las clasificaciones étnicas-nacionales.The "Indigenous issue" as a state policy in Argentina has been accompanied by an academic production of ethnic maps. Hegemonic definitions of these entities used to presume some "essential" elements like the phenotype, the use of language or consanguineous lineage membership. Based on the reformulation of kinship theory, which came from the heuristic model of houses and relatedness theory, we propose an approach to social memory as an alternative framework for historical interpretation. This includes kinship social practices as well as the materialization of group membership's continuity in policies and places of memory -such as stone yards, productive activities, open fields and sacred places- in the Chubut central plateau. Finally, we argue that regarding a physical space, these relations question not only the ethnic-national classifications but also the traditional academic definitions of kinship and chieftaincy.

Unravelling aquifer-wetland interaction using CSAMT and gravity methods: the Mollina-Camorra aquifer and the Fuente de Piedra playa-lake, southern Spain

Science.gov (United States)

Pedrera, A.; Martos-Rosillo, S.; Galindo-Zaldívar, J.; Rodríguez-Rodríguez, M.; Benavente, J.; Martín-Rodríguez, J. F.; Zúñiga-López, M. I.

2016-06-01

The hydrological regime of Fuente de Piedra playa-lake (Málaga, southern Spain) has been significantly affected by the intensive exploitation of groundwater in the area. The playa-lake is situated above clays, marls, and gypsum, and under unaltered conditions received surface-subsurface runoff within the watershed as well as groundwater discharge from two carbonate aquifers. We have analyzed the structure of the main one, the Mollina-Camorra carbonate aquifer, by combining controlled source audio magnetotellurics (CSAMT), gravity prospecting, and time-domain electromagnetic (TDEM) soundings. This geophysical information, together with new structural and hydrogeological data, was gathered to develop a new conceptual hydrogeological model. This model allows the hydrological linkage of the carbonate aquifer with the playa-lake system to be established. Moreover, the intensive exploitation in the carbonate aquifer, even outside the watershed of the playa-lake, has affected the hydrological regime of the system. This multidisciplinary work demonstrates the potential of geophysical methods for understanding wetland-aquifer interaction, having important groundwater management implications.

Playa Soil Moisture and Evaporation Dynamics During the MATERHORN Field Program

Science.gov (United States)

Hang, Chaoxun; Nadeau, Daniel F.; Jensen, Derek D.; Hoch, Sebastian W.; Pardyjak, Eric R.

2016-06-01

We present an analysis of field data collected over a desert playa in western Utah, USA in May 2013, the most synoptically active month of the year, as part of the Mountain Terrain Atmospheric Modeling and Observations (MATERHORN) program. The results show that decreasing surface albedo, decreasing Bowen ratio and increasing net radiation with increasing soil moisture sustained a powerful positive feedback mechanism promoting large evaporation rates immediately following rain events. Additionally, it was found that, while nocturnal evaporation was negligible during dry periods, it was quite significant (up to 30 % of the daily cumulative flux) during nights following rain events. Our results further show that the highest spatial variability in surface soil moisture is found under dry conditions. Finally, we report strong spatial heterogeneities in evaporation rates following a rain event. The cumulative evaporation for the different sampling sites over a five-day period varied from ≈ 0.1 to ≈ 6.6 mm. Overall, this study allows us to better understand the mechanisms underlying soil moisture dynamics of desert playas as well as evaporation following occasional rain events.

Using 87Sr/86Sr Ratios of Carbonate Minerals in Dust to Quantify Contributions from Desert Playas to the Urban Wasatch Front, Utah, USA

Science.gov (United States)

Goodman, M.; Carling, G. T.; Fernandez, D. P.; Rey, K.; Hale, C. A.; Nelson, S.; Hahnenberger, M.

2017-12-01

Desert playas are important dust sources globally, with potential harmful health impacts for nearby urban areas. The Wasatch Front (population >2 million) in western Utah, USA, is located directly downwind of several playas that contribute to poor air quality on dust event days. Additionally, the exposed lakebed of nearby Great Salt Lake is a growing dust source as water levels drop in response to drought and river diversions. To investigate contributions of playa dust to the Wasatch Front, we sampled dust emissions from the exposed lakebed of Great Salt Lake and seven playas in western Utah, including Sevier Dry Lake, and dust deposition at four locations stretching 160 km from south to north along the Wasatch Front, including Provo, Salt Lake City, Ogden, and Logan. The samples were analyzed for mineralogy, bulk chemistry, and 87Sr/86Sr ratios for source apportionment. The mineralogy of playa dust and Wasatch Front dust samples was dominated by quartz, feldspar, chlorite and calcite. Bulk geochemical composition was similar for all playa dust sources, with higher anthropogenic metal concentrations in the Wasatch Front. Strontium isotope (87Sr/86Sr) ratios in the carbonate fraction of the dust samples were variable in the playa dust sources, ranging from 0.7105 in Sevier Dry Lake to 0.7150 in Great Salt Lake, providing a powerful tool for apportioning dust. Based on 87Sr/86Sr mixing models, Great Salt Lake contributed 0% of the dust flux at Provo, 20% of the dust flux at Salt Lake City, and 40% of the dust flux at Ogden and Logan during Fall 2015. Contrastingly, Great Salt Lake dust was less important in Spring of 2016, contributing 0% of the dust flux at Provo and City and Logan. Two major dust events that occurred on 3 November 2015 and 23 April 2016 had similar wind and climate conditions as understood by HYSPLIT backward trajectories, meaning that seasonal variability in dust emissions is due to playa surface conditions rather than meteorologic conditions

Strontium isotope geochemistry of soil and playa deposits near Yucca Mountain, Nevada

International Nuclear Information System (INIS)

Marshall, B.D.; Mahan, S.A.

1994-01-01

The isotopic composition of strontium contained in the carbonate fractions of soils provides an excellent tracer which can be used to test models for their origin. This paper reports data on surface coatings and cements, eolian sediments, playas and alluvial fan soils which help to constrain a model for formation of the extensive calcretes and fault infillings in the Yucca Mountain region. The playas contain carbonate with a wide range of strontium compositions; further work will be required to fully understand their possible contributions to the pedogenic carbonate system. Soils from an alluvial fan to the west of Yucca Mountain show that only small amounts of strontium are derived from a fan draining a carbonate terrane have strontium component. Although much evidence points to an eolian source for at least some of the strontium in the pedogenic carbonates near Yucca Mountain, an additional component or past variation of strontium composition in the eolian source is required to model the pedogenic carbonate system

Sliding rocks on Racetrack Playa, Death Valley National Park: first observation of rocks in motion.

Directory of Open Access Journals (Sweden)

Richard D Norris

Full Text Available The engraved trails of rocks on the nearly flat, dry mud surface of Racetrack Playa, Death Valley National Park, have excited speculation about the movement mechanism since the 1940s. Rock movement has been variously attributed to high winds, liquid water, ice, or ice flotation, but has not been previously observed in action. We recorded the first direct scientific observation of rock movements using GPS-instrumented rocks and photography, in conjunction with a weather station and time-lapse cameras. The largest observed rock movement involved > 60 rocks on December 20, 2013 and some instrumented rocks moved up to 224 m between December 2013 and January 2014 in multiple move events. In contrast with previous hypotheses of powerful winds or thick ice floating rocks off the playa surface, the process of rock movement that we have observed occurs when the thin, 3 to 6 mm, "windowpane" ice sheet covering the playa pool begins to melt in late morning sun and breaks up under light winds of -4-5 m/s. Floating ice panels 10 s of meters in size push multiple rocks at low speeds of 2-5 m/min. along trajectories determined by the direction and velocity of the wind as well as that of the water flowing under the ice.

Evolución geomorfológica y vegetación costera de playa Palmeras Parque Nacional Natural Isla Gorgona, Pacífico Colombiano

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Gladys Bernal

2014-07-01

Full Text Available Se realizó un estudio de la geomorfología y vegetación en playa Palmeras a partir del levantamiento de un modelo digital de elevación, mediciones sistemáticas de perfiles de playa durante 15 meses, análisis de la planta de equilibrio, mediciones de coberturas vegetales, conductividad eléctrica del agua de inundación y granulometría en 15 parcelas establecidas a lo largo de la playa. La playa se puede dividir en dos sectores. El sector NE se caracteriza por una forma en planta cóncava, cúspides de playa, mayor pendiente, mayor elevación, amplia zona seca, mayor variabilidad de la forma en planta y en perfil y mayor tendencia a la acreción, con vegetación herbácea dominada por Rhynchospora polystachys. El sector SW tiene una forma en planta convexa, es menos elevado, el ancho de zona seca es mínimo, la variabilidad de la planta y perfil son menores y tiende a la erosión. La vegetación herbácea en este sector está dominada por Sphagneticola trilobata y hay mayor proporción de palmas muertas. Aunque la longitud de las observaciones limita las conclusiones sobre la variabilidad estacional e interanual de la playa, la cota de inundación aumenta en la época húmeda y hay mayor pérdida de sedimentos. Asimismo, durante años El Niño se evidenció un incremento de la energía del oleaje, que estaría asociado con erosión costera. En el largo plazo hay evidencias de un cambio en la dirección del oleaje y una basculación de la playa con acreción hacia el NE y erosión hacia el SW.

Development of the Cerro solo deposit and uranium favorability of the San Jorge Gulf Basin, province of Chubut

International Nuclear Information System (INIS)

Navarra, P.R.; Benitez, A.F.

1997-01-01

In the future the uranium exploration activities of CNEA would tend to improve the knowledge of geology and uranium favorability; to perform prospection tasks, and research and development in exploration technologies, to contribute to be in a position to meet the requirements of the country in the long term. On the other hand, a strong growth of nuclear capacity is expected in the first two decades of the next century. Based on its promising grade, the Cerro Solo uranium ore deposit was selected in 1990 by the CNEA to carry out an assessment project. The intensive exploration level was accomplished, as follows: definition of general characteristics of the main orebodies; detailed geologic studies; estimation of resources with adequate data; and preliminary selection of mining-milling methods to estimate the potential profitability of the project. The deposit belongs to the sandstone type. The mineralized layers are distributed into the fluvial sandstones and conglomerates of the cretaceous Chubut Group, lying 50 to 130 m deep Resources of the deposit, with an average grade of 0.3% U, in tonnes of recoverable uranium at costs of up to $80/kg U, are: Reasonable Assured Resources (RAR): 800 t U, Estimated Additional Resources, Category I (EAR-I): 2100 t U. Follow-up drilling programmes are being performed at present in some of the target sites defined in the paleochannel that hosts the Cerro Solo deposit, in order to establish the hypothetical resources of the area. The sites were determined as a result of the exploration that CNEA conducted in the Pichinan uranium district. Recently a regional research project was formulated, for the detailed exploration in the San Jorge Gulf Basin, where the Chubut Group is distributed. 17 refs, 4 figs

Caracterización cuantitativa de la generación de residuos sólidos en la playa de Varadero

OpenAIRE

Laureano José López Moreda; Georgia Alina Pérez Falcón; Inalbis Ruiz Castell; Olivia Orellanes Rodríguez; Ricardo Cruz Nardo

2011-01-01

Varadero constituye el destino turístico de sol y playa más importante del país. La playa, es una parte significativa del producto que está ofreciendo la industria turística. Sin embargo la concentración de gran cantidad de público en este espacio, unido al hábito de consumir bebidas y alimentos durante su estancia, trae consigo la generación de volúmenes significativos de residuos, fundamentalmente vidrio, plástico,...

ESTRATEGIAS PARA EL REPOBLAMIENTO DE PLAYAS. EL CASO DE MAR DEL SUD (ARGENTINA

Directory of Open Access Journals (Sweden)

Noelia Aymara Padilla

2016-12-01

Full Text Available La investigación presenta estrategias para repoblar una playa, con la inclusión de distintas obras de defensa costera. A partir de ello analiza el caso específico de la localidad de Mar del Sud, donde sus playas evidencian la presencia de grandes afloramientos rocosos producto de la pérdida vertical de arena principalmente por la actividad minera. En base al conocimiento de sus condiciones físico-naturales y de los procesos históricos urbano-turísticos que influyeron en la reducción de sedimentos se prepone analizar qué estrategia pueden aplicarse en la localidad con el fin de reducir y/o mitigar la problemática que ponen en riesgo la sustentabilidad del destino. Basó su desarrollo en los métodos: cualitativo, geo-histórico y comprensivo-explicativo, obteniendo como resultados principales las estrategias de repoblamiento que pueden aplicarse al área de estudio.

The utilization of ERTS-1-generated photographs in the evaluation of the Iranian playas as potential locations for economic and engineering development

Science.gov (United States)

Krinsley, D. B. (Principal Investigator)

1974-01-01

The author has identified the following significant results. Seasonal monitoring of hydrologic conditions at three playa lakes provides a basis for constructing an annual water inventory for these lakes. Although the extreme variation in the extent of playa lakes must be considered, the principal periods of their fluctuations are generally constant. Playa lakes provide an important water source for arid region needs, and their water can be diverted and stored for use during the long, hot, and dry summer. At their 1973 maxima, approximately 400 million cu m and 794 million cu m of water were available at the lakes at Qom and Neriz playas, respectively. These lakes adjoin areas of moderately dense population that have severe annual water deficits. A preliminary road alignment across the Great Kavir in north-central Iran has been prepared from an analysis of ERTS-1 images of that area from September 2, 1972, through May 12, 1973, a total of 6 scenes. An all-weather road constructed along this alignment could reduce the distance between points north and south of the Great Kavir by as much as 700 km.

Evaluation of the Cerro Solo nuclear ore, province of Chubut. The Cerro Solo project within the frame of uranium exploration in Argentina. Pt. 1

International Nuclear Information System (INIS)

Solis, R.J.; Navarra, P.R.; Benitez, A.F.; Gallucci, A.R.

1993-01-01

The Cerro Solo ore deposit was selected by the CNEA to invest in an assessment project because of their promising grade and amount of known and potential resources, significant to Argentina's uranium requirements. The deposit, which is located in the central region of the Chubut Province, belongs to the sandstone type and is hosted by the cretaceous Chubut Group. Technical studies carried out forecast an important growth of nuclear capacity to meet Argentina's energy requirements in the first two decades of of the the next century. To be in position to confront the challenge presented by increasing uranium resources to fuel the nuclear powers plants it is very important, as a first step, to improve the geological knowledge of uranium favorability in the country. The preliminary results of the Cerro Solo project indicate that the eastern slope of the Pichinan hills is a promising area for development of uranium resources, increasing the favorability of the San Jorge Basin in order to allow contributing to meet future uranium requirements. The Cerro Solo Project was planned in a sequential manner, as a multidisciplinary effort which includes studies on: geologic setting of mineralization, resource estimates, costs of mining and milling methods, economic analysis and environmental impact research. Among the mining methods, studies include the alternative of the in-situ leaching technology, which is becoming a low producing cost interesting possibility. (Author)

Mapas de inundación por tsunamis en Playas del Coco y Puntarenas, Costa Rica

Directory of Open Access Journals (Sweden)

Zamora Sauma, Natalia

2010-12-01

Full Text Available La presente investigación presenta algunos de los resultados obtenidos por el proyecto "Mapa de inundación por tsunamis para Costa Rica, primera fase, Puntarenas y Playas del Coco". Muestra los resultados obtenidos con respecto a simulaciones realizadas. Explica información del ambiente tectónico de la zona. Finalmente, expone algunas de las acciones de reducción del riesgo de inundación por tsunami y mitigación This investigation includes some of the results obtained in the project "Flood Map by Tsunamis in Costa Rica, First Stage: Puntarenas and Playas del Coco." It shows the results obtained as a result of simulations. It explains information about the tectonic environment of the zone. Finally, it exposes some of actions to reduce tsunami flood risk and mitigation

Macroinfauna en playas arenosas de la costa del Norte Grande de Chile sometidas a diferentes presiones antrópicas

OpenAIRE

Acuña, Emilio O; Jaramillo, Eduardo

2015-01-01

Las playas arenosas urbanas son afectadas por limpieza artificial y recreación, lo que resulta en perturbación de los sedimentos y la macroinfauna. Durante octubre 2012, se muestrearon 3 playas urbanas y 4 no urbanas a lo largo de la costa del norte de Chile (ca., 20-21°S), para evaluar la estructura comunitaria de la macroinfauna intermareal. Se replicaron 4 transectos perpendiculares a la línea de costa extendidos entre el intermareal superior y el nivel de la marea baja, para recolectar mu...

Strontium isotope geochemistry of soil and playa a deposits near Yucca Mountain, Nevada

International Nuclear Information System (INIS)

Marshall, B.D.; Mahan, S.A.

1994-01-01

The isotopic composition of strontium contained in the carbonate fractions of soils provides an excellent tracer which can be used to test models for their origin. This paper reports data on surface coatings and cements, eolian sediments, playas and alluvial fan soils which help to constrain a model for formation of the extensive calcretes and fault infilling in the Yucca Mountain region. The playas contain carbonate with a wide range of strontium compositions; further work will be required to fully understand their possible contributions to the pedogenic carbonate system. Soils from an alluvial fan to the west of Yucca Mountain show that only small amounts of strontium are derived from weathering of silicate detritus. However, calcretes from a fan draining a carbonate terrane have strontium compositions dominated locally by the limestone strontium component. Although much evidence points to an eolian source for at least some of the strontium in the pedogenic carbonates near Yucca Mountain, an additional component or past variation of strontium composition in the eolian source is required to model the pedogenic carbonate system

Hydrology and surface morphology of the Bonneville Salt Flats and Pilot Valley Playa, Utah

Science.gov (United States)

Lines, Gregory C.

1979-01-01

The Bonneville Salt Flats and Pilot Valley are in the western part of the Great Salt Lake Desert in northwest Utah. The areas are separate, though similar, hydrologic basins, and both contain a salt crust. The Bonneville salt crust covered about 40 square miles in the fall of 1976, and the salt crust in Pilot Valley covered 7 square miles. Both areas lack any noticeable surface relief (in 1976, 1.3 feet on the Bonneville salt crust and 0.3 foot on the Pilot Valley salt crust).The salt crust on the Salt Flats has been used for many years for automobile racing, and brines from shallow lacustrine deposits have been used for the production of potash. In recent years, there has been an apparent conflict between these two major uses of the area as the salt crust has diminished in both thickness and extent. Much of the Bonneville Racetrack has become rougher, and there has also been an increase in the amount of sediment on the south end of the racetrack. The Pilot Valley salt crust and surrounding playa have been largely unused.Evaporite minerals on the Salt Flats and the Pilot Valley playa are concentrated in three zones: (1) a carbonate zone composed mainly of authigenic clay-size carbonate minerals, (2) a sulfate zone composed mainly of authigenic gypsum, and (3) a chloride zone composed of crystalline halite (the salt crust). Five major types of salt crust were recognized on the Salt Flats, but only one type was observed in Pilot Valley. Geomorphic differences in the salt crust are caused by differences in their hydrologic environments. The salt crusts are dynamic features that are subject to change because of climatic factors and man's activities.Ground water occurs in three distinct aquifers in much of the western Great Salt Lake Desert: (1) the basin-fill aquifer, which yields water from conglomerate in the lower part of the basin fill, (2) the alluvial-fan aquifer, which yields water from sand and gravel along the western margins of both playas, and (3) the

Aeolian responses to climate variability during the past century on Mesquite Lake Playa, Mojave Desert

Science.gov (United States)

Whitney, John W.; Breit, George N.; Buckingham, S.E.; Reynolds, Richard L.; Bogle, Rian C.; Luo, Lifeng; Goldstein, Harland L.; Vogel, John M.

2015-01-01

The erosion and deposition of sediments by wind from 1901 to 2013 have created large changes in surface features of Mesquite Lake playa in the Mojave Desert. The decadal scale recurrence of sand-sheet development, migration, and merging with older dunes appears related to decadal climatic changes of drought and wetness as recorded in the precipitation history of the Mojave Desert, complemented by modeled soil-moisture index values. Historical aerial photographs, repeat land photographs, and satellite images document the presence and northward migration of a mid-20th century sand sheet that formed during a severe regional drought that coincided with a multi-decadal cool phase of the Pacific Decadal Oscillation (PDO). The sand sheet slowly eroded during the wetter conditions of the subsequent PDO warm phase (1977–1998) due to a lack of added sediment. Sand cohesion gradually increased in the sand sheet by seasonal additions of salt and clay and by re-precipitation of gypsum, which resulted in the wind-carving of yardangs in the receding sand sheet. Smaller yardangs were aerodynamically shaped from coppice dunes with salt-clay crusts, and larger yardangs were carved along the walls and floor of trough blowouts. Evidence of a 19th century cycle of sand-sheet formation and erosion is indicated by remnants of yardangs, photographed in 1901 and 1916, that were found buried in the mid-20th century sand sheet. Three years of erosion measurements on the playa, yardangs, and sand sheets document relatively rapid wind erosion. The playa has lowered 20 to 40 cm since the mid-20th century and a shallow deflation basin has developed since 1999. Annually, 5–10 cm of surface sediment was removed from yardang flanks by a combination of wind abrasion, deflation, and mass movement. The most effective erosional processes are wind stripping of thin crusts that form on the yardang surfaces after rain events and the slumping of sediment blocks from yardang flanks. These wind

Las certificaciones en el sector turístico español: gestión de las playas españolas

OpenAIRE

Fernández Alles, María Teresa; Moral Moral, María; Jiménez Caballero, José Luis (Coordinador)

2011-01-01

El modelo de “sol y playa”, pieza clave del sector turístico español, se basa en las playas como principal recurso de la actividad turística. Los cambios acaecidos en el entorno debido a los avances tecnológicos, el cambio en el comportamiento del consumidor turístico, así como el aumento de la competencia con la aparición de nuevos destinos turísticos competidores de “sol y playa”, han llevado a la necesidad de reinventar el tradicional producto turístico de sol y playa, ...

Clasificación e impacto ambiental de los residuos sólidos generados en las playas de Riohacha, La Guajira, Colombia

OpenAIRE

Elin Márquez Gulloso; Jairo Rafael Rosado Vega

2011-01-01

En la presente investigación se realizó una clasificación y valoración de impacto de los residuos sólidos generados en las playas de Riohacha, desde Valle de los Cangrejos hasta el Barrio Marbella. Se seleccionaron cinco estaciones de muestreo; en cada una se ubicaron transectos perpendiculares a la línea de costa; sobre estos se trazaron cuadrantes paralelos para la recolección de residuos sólidos. Además, se aplicaron encuestas a los usuarios y vendedores de las playas para determinar la pe...

Bogotá no tiene mar pero tiene playa: el vallenato y sus intérpretes costeños en Bogotá

OpenAIRE

Jaramillo Acuña, Juan Guillermo

2015-01-01

La Playa es un sector de la ciudad de Bogotá, donde se encuentra la oferta de músicos informales más grande de Colombia: mariachis, tríos de cuerda y grupos vallenatos. En esta investigación, se analiza la migración de músicos vallenatos provenientes del Caribe colombiano a este sector de la capital del país; se examina el trabajo de estos músicos en La Playa; y se revisa el proceso de consolidación del vallenato como música nacional.

Saline Playas on Qinghai-Tibet Plateau as Mars Analog for the Formation-Preservation of Hydrous Salts and Biosignatures

Science.gov (United States)

Wang, A.; Zheng, M.; Kong, F.; Sobron, P.; Mayer, D. P.

2010-12-01

Qinghai-Tibet (QT) Plateau has the highest average elevation on Earth (~ 4500 m, about 50-60% of atmospheric pressure at sea-level). The high elevation induces a tremendous diurnal (and seasonal) temperature swing caused by high level of solar irradiation during the day and low level of atmospheric insulation during the evening. In addition, the Himalaya mountain chain (average height >6100 m) in the south of the QT Plateau largely blocks the pathway of humid air from the Indian Ocean, and produces a Hyperarid region (Aridity Index, AI ~ 0.04), the Qaidam Basin (N32-35, E90-100) at the north edge of the QT Plateau. Climatically, the low P, T, large ΔT, high aridity, and high UV radiation all make the Qaidam basin to be one of the most similar places on Earth to Mars. Qaidam basin has the most ancient playas (up to Eocene) and the lakes with the highest salinity on QT Plateau. More importantly, Mg-sulfates appear in the evaporative salts within the most ancient playas (Da Langtang) at the northwest corner of Qaidam basin, which mark the final stage of the evaporation sequence of brines rich in K, Na, Ca, Mg, Fe, C, B, S, and Cl. The evaporation minerals in the saline playas of Qaidam basin, their alteration and preservation under hyperarid conditions can be an interesting analog for the study of Martian salts and salty regolith. We conducted a field investigation at Da Langtan playa in Qaidam basin, with combined remote sensing (ASTER on board of NASA’s Terra satellite, 1.656, 2.167, 2.209, 2.62, 2.336, 2.40 µm), in situ sensing of a portable NIR spectrometer (WIR, 1.25-2.5 µm continuous spectral range), and the laboratory analyses of collected samples from the field (ASD spectrometer, 0.4 -2.5 µm, and Laser Raman spectroscopy). The results indicate that the materials contributing the high albedo layers in playa deposits are carbonate-gypsum-bearing surface soils, salt-clay-bearing exhaumed Pleistocene deposits, dehydrated Na-sulfates, hydrous Mg

Distribución espacial de Ocypode quadrata (Decapoda: Ocypodidae en ocho playas de la zona norte oriental de Cuba

Directory of Open Access Journals (Sweden)

Frank A. Ocaña

2012-09-01

Full Text Available Uno de los organismos más comunes en las playas arenosas son los miembros del género Ocypode conocidos como cangrejos fantasmas, están ampliamente distribuidos en las regiones tropicales y subtropicales; además tienen un importante papel en la transferencia de energía en diferentes niveles tróficos. El objetivo del presente trabajo es dar a conocer aspectos relacionados con la variación espacial de la densidad de O. quadrata en playas con diferente nivel de influencia humana en la costa norte oriental de Cuba. En mayo de 2010, fueron contadas un total de 355 galerías en 360 unidades de muestreo. La composición por clases de tallas fue de 237 galerías de jóvenes y 118 de adultos. Del total de galerías contadas el 74% ocuparon el nivel P1, 20% el nivel P2 y 6% el nivel P3. La densidad varió entre 0.06-0.52galerías/m2. A pesar del nivel de influencia humana, la mayoría de las playas no mostró diferencias significativas en la densidad de galerías (Scheffé, p>0.05. La densidad de individuos en la zona superior de resaca del oleaje es mayor (Scheffé, p<0.05, predominando los jóvenes y en el resto de los estratos la densidad total va disminuyendo y predominan los individuos adultos. El patrón de variación entre los estratos no fue el mismo para todas las playas. En el presente estudio no se encontró evidencia directa entre el nivel de turismo y la densidad de galerías del cangrejo fantasma

Evaluation of the Cerro Solo nuclear ore, province of Chubut. On the economic parameters of the deposit. Pt. 3

International Nuclear Information System (INIS)

Navarra, P.R.; Sardin, P.G.; Urquiza, L.; Bernal, G.J.; Guzman Lobos, D.

1993-01-01

Preliminary results of the resources estimation carried out in the Cerro Solo uranium ore deposit, located in the Chubut Province, 1900 km SW from Buenos Aires and 380 Km W from Trelew, presented in tonnes of uranium recoverable at costs up to U$S 80/kgU, are as follows: a) Reasonable assured resources (indicated): 800 tU; b) Estimates Additional Resources (inferred): 2200 tU. Economic evaluation at the order-of-magnitude level, performed using the grade-tonnage model of the deposit, resulted a useful tool in the different stages of the project to identify the influence of technical parameters on the potential profitability. Research about feasibility of in-situ leaching method of exploitation for this deposit introduces an interesting alternative for future uranium production in the country. (Author)

Landsat classification of surface-water presence during multiple years to assess response of playa wetlands to climatic variability across the Great Plains Landscape Conservation Cooperative region

Science.gov (United States)

Manier, Daniel J.; Rover, Jennifer R.

2018-02-15

To improve understanding of the distribution of ecologically important, ephemeral wetland habitats across the Great Plains, the occurrence and distribution of surface water in playa wetland complexes were documented for four different years across the Great Plains Landscape Conservation Cooperative (GPLCC) region. This information is important because it informs land and wildlife managers about the timing and location of habitat availability. Data with an accurate timestamp that indicate the presence of water, the percent of the area inundated with water, and the spatial distribution of playa wetlands with water are needed for a host of resource inventory, monitoring, and research applications. For example, the distribution of inundated wetlands forms the spatial pattern of available habitat for resident shorebirds and water birds, stop-over habitats for migratory birds, connectivity and clustering of wetland habitats, and surface waters that recharge the Ogallala aquifer; there is considerable variability in the distribution of playa wetlands holding water through time. Documentation of these spatially and temporally intricate processes, here, provides data required to assess connections between inundation and multiple environmental drivers, such as climate, land use, soil, and topography. Climate drivers are understood to interact with land cover, land use and soil attributes in determining the amount of water that flows overland into playa wetlands. Results indicated significant spatial variability represented by differences in the percent of playas inundated among States within the GPLCC. Further, analysis-of-variance comparison of differences in inundation between years showed significant differences in all cases. Although some connections with seasonal moisture patterns may be observed, the complex spatial-temporal gradients of precipitation, temperature, soils, and land use need to be combined as covariates in multivariate models to effectively account for

EL IMPACTO DE LA AGRICULTURA INTENSIVA EN EL USO TURÍSTICO DE LAS PLAYAS DE MARINA DE COPE (MURCIA

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F. Belmonte Serrato

2011-01-01

Full Text Available El desarrollo de la agricultura intensiva y, especialmente, la ocupación agrícola de los fondos de las ramblas, ha ocasionado un desequilibrio sedimentario en las playas de Marina de COPE. Los retrocesos de la línea de costa oscilan entre 16 y 68 m y la disminución de la superficie se estima en un 50% de la correspondiente a 1956. Esto, ha reducido su capacidad de carga potencial que, para una intensidad de uso de 25 m2/usuario, ha pasado de 4.400 usuarios potenciales por día a 2.200. Lo que implica, para los meses de uso de estas playas, julio y agosto, una pérdida de capacidad de 130.000 usuarios.

Sostenibilidad sociocultural del turismo: propuestas para el cantón Playas. Provincia del Guayas, Ecuador

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José Lázaro Quintero Santos

2016-03-01

Full Text Available Este artículo forma parte de la investigación “Propuesta de un Modelo de Desarrollo Turístico Sostenible para el cantón Playas, provincia del Guayas, Ecuador”. En este caso solo se hace referencia a la propuesta de un modelo de sostenibilidad sociocultural de los impactos del turismo. La investigación se realiza en el cantón Playas debido a la importancia estratégica que tiene el desarrollo del turismo para este territorio gracias a su efecto multiplicador en el resto de las actividades económicas. La metodología de la investigación ha incluido un estudio cuantitativo y cualitativo del territorio, así como, entrevistas y encuestas a los actores locales. Para lograr el objetivo de esta investigación se ha realizado un análisis social y cultural considerando los recursos patrimoniales y socioculturales de la zona. El estudio comprende programas y proyectos que permiten formular una propuesta de turismo sostenible que sea inclusiva y respetuosa con las comunidades y sus culturas.

Sliding stones of Racetrack Playa, Death Valley, USA: The roles of rock thermal conductivity and fluctuating water levels

Czech Academy of Sciences Publication Activity Database

Kletetschka, Günther; Hooke, R. L.; Ryan, A.; Fercana, G.; McKinney, E.; Schwebler, K. P.

2013-01-01

Roč. 195, 1 August (2013), s. 110-117 ISSN 0169-555X Institutional support: RVO:67985831 Keywords : Endorheic * Finite element modeling * hydrogeology * Racetrack playa * sliding stones Subject RIV: DB - Geology ; Mineralogy Impact factor: 2.577, year: 2013

Aproximación a la emigración española a la provincia del Chubut: los yacimientos petrolíferos fiscales (1915-1933

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Castiñeira Castro, Víctor Manuel

1999-12-01

Full Text Available La ciudad de Comodoro Rivadavia, enclavada en la actual provincia argentina del Chubut, se convirtió a comienzos del presente siglo, y con motivo del descubrimiento en la zona de importantes yacimientos de petróleo, en un destacado foco de atracción de inmigración. A través del análisis de YPF, la empresa más influyente de la zona, observamos la importancia jugada por la colectividad española en este proceso, así como su carácter de inmigración no especializada tendente a ocupar los empleos menos reconocidos en la empresa.

Evaluation of the Cerro Solo nuclear ore, province of Chubut. Geological characteristics of the deposit and of the basin. Pt. 2

International Nuclear Information System (INIS)

Benitez, A.F.; Fuente, A.; Maloberti, A.; Landi, V.A.; Bianchi, R.E.; Marveggio de Bianchi, N.; Gayone, M.R.

1993-01-01

The Cerro Solo uranium ore deposit, is located 420 km west from Trelew city, Chubut province, in the extra-andean. The geologic environment belongs to the northwest edge portion of the intracratonic San Jorge Gulf Basin. The uraniferous district is named Pichinanes Ridge district. The mineralization lies 25 to 130 m depth, and is hosted by Los Adobes formation aged Aptian-Albian, made up by conglomerates, sandstones, coarse-sandstones and less abundant siltstones and claystones. The Cerro Solo ore deposit that belongs to the sandstone type-uranium occurrences are lenticular or tabular shaped, associated with organic material and pyrite, generally roughly parallel to the bedding (Trend-Type). The uranium minerals are uraninite and coffinite associated with organic material and pyrite, and frequently hematite, goethite, calcite, siderite and barite are observed. (Author)

Estudio inicial y plan maestro del proyecto de playa de "Las Calas"

OpenAIRE

Gamboa Otero, José Luis; Siucho Dextre, Julián

2016-01-01

El proyecto de desarrollo inmobiliario Las Calas se ubica en el kilómetro 180 de la carretera Panamericana Norte. Asimismo, cuenta con una extensión total de 244 ha, que enmarcan tres playas privadas (Quita Calzón, Lampay y Mirador). Cabe agregar que abarca 3.5 km de litoral y de acantilados. El proyecto se desarrollará en el transcurso de 10 años. En este lapso de tiempo, se proveerá distintos productos inmobiliarios y de uso mixto. El plan maestro consta de lotes, apartamentos, cancha ...

Potential transport pathways of dust emanating from the playa of Ebinur Lake, Xinjiang, in arid northwest China

Science.gov (United States)

Ge, Yongxiao; Abuduwaili, Jilili; Ma, Long; Wu, Na; Liu, Dongwei

2016-09-01

In this paper, the HYSPLIT model, driven with reanalysis meteorological data from 1978 to 2013, was used to understand the potential transport characteristics of dust and salt dust emanating from the playa of Ebinur Lake in arid northwest China. Daily air parcel trajectories were computed forward for 8 days from an origin centered over Ebinur Lake at 100 m above ground level. Air parcel trajectory density plots were mapped for seven levels: 0-100 m agl., 100-500 m agl., 500-1000 m agl., 1000-1500 m agl., 1500-2000 m agl., 2000-3000 m agl., and 3000-5000 m agl. These show that potential dust transport pathways have clear seasonal differentiation. The potential transport distance of dust and salt dust is greatest in spring and summer. In autumn and winter, the potential transport of the high-density air trajectory is below 1000 m traveling a shorter distance. Potential dust transport pathways showed notifying directivity in different seasons and heights. Southeast in spring and summer, and north to northeast in autumn and winter are the two main potential transport channels of dust and salt dust. Accordingly, dust and salt dust from the playa of Ebinur Lake may influence the atmospheric processes and biogeochemical cycles of a vast region. The main area of influence of dust and salt dust is close to the source area, and will significantly accelerate the melting of snow and ice in the Tianshan Mountains. This highlights the urgent need to combine remote sensing, isotope and other methods to further research the transport characteristics of dust and salt dust from the playa of the Ebinur Lake.

Geomorfologia Costera y Explotación de Arena de Playa en la Provincia de Buenos Aires y sus Consecuencias Ambientales

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Silvia C. Marcomini

2006-12-01

Full Text Available El present trabajo tiene como objetivo principal caracterizar el medio físico de las áreas costeras, con el fin determinar los impactos en la hidrodinámica litoral, a mediano y corto plazo, generado por la explotación de arena de playa en las principales localidades costeras de la provincia de Buenos Aires, entre cabo San Antonio y Necochea. Para tal fin se describen las explotaciones mineras de mayor magnitud llevadas a cabo a lo largo de la costa de la provincia de Buenos Aires y se analiza su efecto para cada morfología costera. En todos los casos las explotaciones han ocasionado un deficit de arena en la corriente de deriva litoral, lo que hace que la erosión se traslade como una onda en el sentido de la deriva litoral, es decir hacia el norte para estas costas. El tipo de costa que recibe el impacto de esta onda condiciona el grado de erosión a la que este sujeta. En costas acantiladas cohesivas las explotaciones han producido un importante incremento en las tasas de retroceso de los acantilados y pérdida de playa. En costas definidas como de tipo B (con desarrollo de bermas los efectos erosivos de la explotacíon, sumados a otros factores antrópicos, han afectado fundamentalmente las morfologías de playa, mientras que en las de tipo A (sin desarrollo de bermas, el efecto no solo ha alcanzado la playa sino que también ha provocado retoceso de la línea de costa. Asimismo de determinó que las tasas de retroceso de la costa se aceleran o retardan en igual medida durante la explotación y recuperación respectivamente; es decir que la recuperación por interrupción de las actividades mineras es semejante en magnitud a la erosión inducida durante la explotación.

Comparación de la percepción social en playas recreativas arenosas de dos bahías localizadas en el Pacífico Mexicano

OpenAIRE

Flores-Mejía, M.A.; Silva-Iñiguez, L.; Cervantes, O.; Navarro-Reyes, C.; Pérez-López, R.; Gutiérrez-Corona, C.G.; Flores-Hernández, M.

2012-01-01

En el presente trabajo se desarrollaron dos formatos de encuesta, para incorporar la percepción de los usuarios a la evaluación de la calidad de las playas (Cervantes, 2006 y Silva-Iñiguez, 2006); ambos basados en un modelo cuantitativo para revelar la percepción social de las playas localizadas en la bahía de Santiago, Manzanillo, Col (MZO) y en Acapulco, Gro (ACA). Se aplicaron un total de 790 encuestas (ACA: 390 y MZO: 400), que permitieron conocer el perfil de los usuarios, sus hábitos de...

Casa para la playa, New Jersey

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Breuer, Marcel

1964-03-01

Full Text Available The McMullan house, built on the beach, has been designed to be inhabited all the year round. Basically this building is a rectangular block, lifted above the dunes on a framework of timber columns and beams. The ground floor contains the entrance hall, the guest room or servant's quarters, including a bath room, and a shower room which can be reached separately from the beach. The second floor is taken up with the main living quarters, and the second floor contains the bedrooms. The northern and southern sides have few windows, whilst the eastern and western sides have balconies protected with sliding and Venetian blinds, which in addition to supplying an effective protection against the sun, give the house a pleasant sense of secluded intimacy. The blinds are made of wood, and are painted dark brown. Doors and windows are also made of wood, but painted white. This beautiful house on the New Jersey coast exhibits in a marked degree the sculptural quality of architecture, a three dimensional plasticity, which is often neglected in many buildings of the more simple kind. Marcel Breuer has succeeded in making each of the facades of this elementary boxlike design have an interest of its own, by playing with their colour, light and shade effects, texture and combination of materials.La casa McMullan, construida en la playa, está proyectada para ser habitada durante todo el año. En esencia es un bloque paralelepipédico, elevado sobre las dunas y sustentado por un sistema de columnas y vigas de madera vistas, tanto en el interior como en el exterior. Su planta baja alberga: la entrada principal, habitación de huéspedes o de servicio con baño y una ducha con acceso desde la playa. El primer piso agrupa las dependencias nobles. Y el segundo, la zona de dormitorios. Las fachadas norte y sur presentan pocos huecos al exterior; y las este y oeste disponen de galerías con persianas correderas y celosías, que, además de proporcionar intimidad a la

La ocupación del desierto de la playa Asia, Lima, Perú

OpenAIRE

Dam, Paulo

2004-01-01

La sensación de inseguridad generada en ciudades como Lima (responsabilidad compartida entre experiencia directa y medios de comunicación) tiene entre sus efectos la proliferación de urbanizaciones cerradas, que de diferentes maneras reproducen el ambiente protegido que tanta nostalgia inspira. Las playas de Asia, en la costa del desierto limeño, sirven de locación para las propuestas más radicales de la arquitectura contemporánea peruana, en asentamientos donde el control parece la palabra d...

Caracterización palinológica de las mieles de la llanura del río Senguerr (Chubut-Argentina

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Alicia Forcone

2000-01-01

Full Text Available Forcone, A. & Tellería, M. C. 2000. Caracterización palinológica de las mieles de la llanuradel río Senguerr (Chubut-Argentina. Darwiniana 38(3-4: 267-271.Con el fin de conocer las plantas melíferas de la llanura del río Senguerr, se realizó el análisispalinológico de 19 muestras de miel. El estudio permitió identificar 57 tipos morfológicos y demostrarque las principales fuentes de néctar pertenecen a las familias Fabaceae, Rosaceae, Brassicaceae yAsteraceae. Del total de muestras analizadas 9 resultaron mixtas y 10 monoflorales, de estas últimas, 8fueron de Melilotus sp. y 2 de Rosaceae. Las mieles estudiadas pueden ser caracterizadas por unaasociación polínica de Trifolieae, Brassicaceae, Rosaceae, Acaena sp., Glycyrrhiza astragalina Gillies exHook. & Arn. and Cyperaceae. En la mayoría de las muestras el contenido polínico fue inferior a 2000granos/gramo

Academic performance study in young athletes from Playas de Castellón Athletics Club

OpenAIRE

Ana Capdevila Seder; Héctor Bellmunt Villalonga; Carlos Hernando Domingo

2014-01-01

The study analyzed the possible relationship between academic performance of young athletes and some of the variables most used in this field. The sample consisted of 40 athletes Athletics Club Playas de Castellón, between 14 and 16 years, 22 boys and 18 girls. The main variables analyzed were academic performance, study habits, gender, sleep, sedentary leisure, socioeconomic status and dedication to sport. The instruments used were questionnaires CHTE (habits and study skills), PFYTL (physic...

Pedo-Chemical Studies on Saline Playas in the Arabian Shelf

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M.S. AI-Sewailem

1998-06-01

Full Text Available This research was undertaken to study the pedo-chemical characteristics of selected playas (sabkhahs in the Arabian Shelf. Results indicated that most of the sabkhahs are flat to almost flat having salt crusts with variable thickness. Profiles representing the sabkhah surface are extremely saline compared with that of the surrounding landscapes. The dominant soluble salts are Cl- and SO4(2- of Na+ followed by Ca2 + or Mg2+. The compositions of the coastal sabkhahs profile layers are closely related to the Gulf water composition while the inland playas are more associated with local conditions. This was continued from the similarity in salt levels, ion molar ratios and relatively high correlation coefficients between the electrical conductivity of soluble salts (EC and either soluble B3+ (r2 =0.80 or soluble Mg2 (r2=0.60 in coastal compared with that of the inland sabkhahs (r2=0.17 and (r2 =O.37, respectively. The main pedological process affecting the formation of coastal sabkhahs is the upward movement of the water table which is rich in sales originating from the Gulf waters either directly or through wind action. Leaching, accumulation of sediments and evaporative concentrations of the solutes are the processes prevailing in the inland sabkhahs. Salt crusts are dominated by Cl-and SO4(2- of Na+ , Mg2+ and Ca2+ salts while K+ salts are relatively low. X-ray diffraction patterns confirm the presence of halite, gypsum and carbonate minerals. Epsomite and bloedtte minerals were identified in both coastal and inland sabkhahs. Specific minerals and relative abundance was quite variable between the salt cmsts due to the characteristic conditions of each sabkhah. The major differences between the inland and coastal sablthahs are related to the source, composition and depth of the water table and consequently the composition and mineralogy of the surface salt crusts.

Un primitivo Notonychopidae (Litopterna del Paleoceno inferior de Punta Peligro, Chubut, Argentina

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Morales, J.

1997-12-01

Full Text Available The discovery of a new ungulate species, Requisia vidmari gen. nov., nov. sp. in the lower Paleocene of Punta Peligro, Chubut (Argentine represents the earliest known record of Litopterna. The dental morphology of this new genus is very similar to that known for Notonychops powelli Soria, 1989, differing mainly by its more primitive M3, which is less elongated and less selenodont. Requisia vidmari, together with Wainka tshotshe Simpson, 1948, can be included in the family Notonychopidae, which appear to represent an ancestral grade in the evolution of Litopterna. Because cladogenesis of South American ungulates clearly took place prior to the Punta Peligro fauna and was apparently rapid, phylogenetic interpretation is difficult.Se comunica un nuevo ungulado con dentición pre-selenodonta del Paleoceno inferior, Peligrense, de Patagonia, Argentina. Su morfología dentaria es muy similar a la de Notonychops powelli Soria, 1989, pero con caracteres más primitivos. La morfología de las cúspides, el tipo de desgaste y los caracteres crescentiformes del M3 indican que Requisia vidmari gen. nov., sp. nov. presenta fuertes evidencias del desarrollo de caracteres selenodontos, por lo que se lo considera como el más primitivo representante del orden Litopterna. Requisia vidmari y probablemente Wainka tshotshe Simpson, 1948, son primitivos en relación a Notonychops, pero su similitud morfológica justificaría su inclusión en la misma familia Notonychopidae. Se considera que la radiación adaptativa de los ungulados paleocenos de América del Sur fue precoz, eventualmente rápida, lo que dificulta encontrar un modelo filogenético suficientemente explicativo.

Parásitos patógenos en arena de playa y su relación con condiciones ambientales, en un balneario de Puerto Cabello, Venezuela, 2012-2013

OpenAIRE

Guerrero De Abreu, Arli Marlinet; Quiñones O, María Virginia; Sequera P, Ernesto José; Marín Franco, José Luis

2014-01-01

Venezuela, presenta una gran variedad de playas frecuentadas durante todo el año, por lo que legalmente se establece un monitoreo permanente de niveles de contaminación para su clasificación "apta" o no para bañistas. Sin embargo, esto no contempla la evaluación parasitológica en la arena de playa como criterio para la referida clasificación. Por ello, la presencia de sólo una forma parasitaria patógena indica que existe contaminación fecal dado por personas, animales o acúmulo de basura a lo...

Mineralogical and geochemical studies on borate deposits from the Shahr- e - Babak playa (Khatoonabad and Robat - Marvast, Kerman province - Iran

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Atefeh Ghaedi

2017-11-01

Full Text Available Introduction Borate deposits are often important constituents of economic non - marine evaporates. They produce under arid climatic conditions in playa lakes (Floyd et al., 1998. In the south – western parts of the Kerman province, such as the Khatoonabad area (east of the city of Shahr –e –Babak and Robat – Marvast basin (west of Shahr – e – Babak, there are several borate deposits. They can be seen mainly in Sanandaj – Sirjan depressions and they occur as borate bearing nodules beneath a thin layer of soil. In general, boron considerably reduces the thermal expansion of glass, provides good resistance to vibration, high temperatures and thermal shock, and improves its toughness, strength, chemical resistance and durability. It also greatly reduces the viscosity of the glass melt. These features, and others, allow it to form superior glass for many industrial and specialty applications (Garrett, 1998. In the past, the ancient residents used them as co-melting matters. Ulexite which is frequently found in the Khatoonabad playa (at 30 km South East of Shahr Babak have Jewel properties (Ghaedi et al., 2014. Materials and methods After reviewing and Library Studies, geological field studies on the borate deposits were carried out from Shahr – e – Babak Playa. In order to take better samples, several pits were excavated with a depth of 30 cm to 1 meter so that borate minerals became apparent. X-ray diffraction analysis (IMIDRO, Karaj, and ICP AES (ALS CHEMEX, Canada methods were carried out on representative samples taken from the studied area. Discussion Field observations show that in the studied areas, borate bearing basins are fed by rivers which have originated from Sanandaj – Sirjan metamorphic rocks, Nain – Baft colored mélanges and igneous rocks of Urumieh – Dokhtar magmatic belt. Borate minerals also occur in fibrous aggregates and massive forms. Mineralogy XRD results show that the studied borate minerals mainly

Temporal Dynamics of Sodic Playa Salt Crust Patterns: Implications for Aeolian Dust Emission Potential

Science.gov (United States)

Nield, J. M.; King, J.; Bryant, R. G.; Wiggs, G.; Eckardt, F. D.; Thomas, D. S.; Washington, R.

2013-12-01

Salt pans (or playas) are common in arid environments and can be major sources of windblown mineral dust, but there are uncertainties associated with their dust emission potential. These landforms typically form crusts which modify both their erosivity and erodibility by limiting sediment availability, modifying surface and aerodynamic roughness and limiting evaporation rates and sediment production. Here we show the relationship between seasonal surface moisture change and crust pattern development based on both remote-sensing and field surface and atmospheric measurements. We use high resolution (sub-cm) terrestrial laser scanning (TLS; ground-based lidar) surveys over weekly, monthly and annual timescales to accurately characterise crustal ridge thrusting and collapse. This can be as much as 2 mm/day on fresh pan areas that have recently been reset by flooding. Over a two month period, this ridge growth can change aerodynamic roughness length values by 6.5 mm. At the same time, crack densities across the surface increase and this raises the availability of erodible fluffy, low density dust source sediment stored below the crust layer. Ridge spaces are defined in the early stages of crust development, as identified by Fourier Transform analysis, but wider wavelengths become more pronounced over time. We present a conceptual model accounting for the driving forces (subsurface, surface and atmospheric moisture) and feedbacks between these and surface shape that lead to crust pattern trajectories between highly emissive degraded surfaces and less emissive ridged or continuous crusts. These findings improve our understanding of temporal changes in dust availability and supply from playa source regions.

Diseño de un sistema de alerta temprana de tsunamis para el cantón General Villamil Playas, provincia del Guayas

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Leonardo Muñoz Montesdeoca

2016-12-01

This study refersto the tsunami early warning system in canton General Villamil Playas, monitored and controlled by the Navy Oceanographic Institute, located in the Southern Naval Base in Guayaquil city. It details the design of the system, the transmission technology selected with the most suitable terminals that will be necessary to install, the determination of the places in the canton General Villamil Playas, Guayas province, where the electronic horns will be located, as well as the type of network that will be used to activate the acoustic devices. Additionally, the main features of the horns required for the system are described, the software design that remotely manages the acoustic terminals as well as the GSM communication between horns through the use of arduino are detailed, and the coverage of each horn of the tsunami early warning system is calculated.   Keywords: Arduino, GSM, GPRS, satellites, tsunamis.

TURISMO DE SOL Y PLAYA. ANÁLISIS DE LA DEMANDA EN BOAVISTA (CABO VERDE)

OpenAIRE

Castillo-Canalejonio, Ana María; Sánchez Cañizares, Sandra Mª

2015-01-01

El turismo de sol y playa ha jugado un papel destacado en el desarrollo socioeconómico de muchos países y las islas siempre han atraído a un gran número de visitantes seducidos por lo exótico. Paralelamente, la demanda de los turistas desde hace unos años, manifiesta una tendencia a buscar nuevas satisfacciones y así aparecen nuevos destinos turísticos. En esta línea el objetivo de este artículo es explorar las posibilidades de desarrollar un turismo sostenible en la isla de Boavista (Cabo Ve...

Reflejos territoriales en destinos religiosos y de sol y playa. De Fátima a Benidorm

OpenAIRE

Santos Solla, Xosé Manuel

2015-01-01

El objetivo de este artículo es reflexionar sobre destinos turísticos neogénicos surgidos a partir de motivaciones diferentes. En concreto focalizamos el trabajo en dos localidades ibéricas seleccionadas como representativas del turismo religioso y de sol y playa: Fátima y Benidorm. Los argumentos que desarrollamos insisten en la idea de que la aparición y evolución de estos destinos no es neutra desde el punto de vista geográfico. Del mismo modo existen coincidencias a la hora de entender su...

Trabajo emocional y satisfacción con el empleo en hoteles de sol y playa

OpenAIRE

Ramírez Velázquez, Ethel; Guerra Rodríguez, Luis Eduardo; Ramis Palmer, Carmen

2016-01-01

Se evalúan las relaciones entre el trabajo emocional y la satisfacción con el empleo de trabajadores del servicio en hoteles de sol y playa del Grupo Cubanacan en el destino Santa Lucía, provincia de Camagüey, Cuba. Se aplica la versión española de la Escala de Trabajo Emocional de Frankfurt para revelar el estado de las dimensiones de esta variable. Las bases de datos obtenidas fueron procesadas con el paquete estadístico Statgraphics Centurion XVI. Se constató que las dimensiones del trabaj...

A hydrous Ca-bearing magnesium carbonate from playa lake sediments, Salines Lake, Spain

Science.gov (United States)

Queralt, I.; Julia, R.; Plana, F.; Bischoff, J.L.

1997-01-01

Sediments of playa Lake Salines, SE, Spain, contain a carbonate mineral characterized by X-ray diffraction peaks very similar to, but systematically shifted from those of pure magnesite. Analyses (SEM, IR and Raman spectroscopy, DTA, TGA, and ICP) indicate the mineral is a hydrous Ca-bearing magnesium carbonate with the chemical formula (Mg0.92,Ca0.08)CO3??3H2O. Thermal characteristics of the mineral are similar to those of other known hydrated magnesium carbonates. X-ray and electron diffraction data suggests a monoclinic system (P21/n space group) with unit-cell parameters of a = 6.063(6), b = 10.668(5), and c = 6.014(4) A?? and ?? = 107.28??.

A method for estimation of hydrological sensibility applied in Golfo San Jorge basin. Province of Chubut. Argentina; Un metodo para estimar la sensibilidad hidrologica aplicado en la cuenca del Golfo San Jorge. Provincia de Chubut. Argentina

Energy Technology Data Exchange (ETDEWEB)

Hernandez, M. A.; Scatizza, C.; Rojo, M.; Preiato, S. A.; Hernandez, L.

2009-07-01

A method developed and used in an area of Chubut Province is described. The object of the method is to determine the underground and surficial hydrological sensitivity in order to select the site of petroleum facilities with the least possible environmental hydric risk. It is based on the conjunction of the GOD method used to assess the intrinsic aquifer vulnerability (original version) and the proposed La Plata Method (MLP) for the surficial hydrological sensitivity. The latter method assigns numerical values based on landforms (positive and negative), slope percent and seasonality of the water regime, using a complexive range scale from zero to one. The Surficial Sensitivity factor results from the average of the three indicators and includes five categories, from low to extreme values. For a global coverage in the underground and surficial terrestrial arches (geo environmental map) it is proposed to compare the GOD values with those of the MLP method using a GIS, through the mathematical overlapping of two raster layers (map algebra) in each map pixel. In addition to the cartographic display, attribute tables can be used to estimate the environmental pollution in soils and waters, existing infrastructure and location of new facilities and drillings. The Arc Map 9.1 program was used due to its capacity for a permanent and quasi-automatic updating of thematic mapping. The map corresponding to Cerro for the initial position 2007 is presented as an example. (Author) 6 refs.

Locomotor activity of Phalerisida maculata Kulzer (Coleoptera, Tenebrionidae on Chilean sandy beaches Actividad locomotora de Phalerisida maculata Kulzer (Coleoptera, enebrionidae en playas arenosas chilenas

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EDUARDO JARAMILLO

2000-03-01

Full Text Available The locomotor activity of the beetle Phalerisida maculata Kulzer (Coleoptera Tenebrionidae was studied on the surface of the substrate in two sandy beaches of the Chilean coast: one in north central (ca. 29ºS and the other in south central Chile (ca.39ºS. During the summer period of 1991 the circadian locomotor activity was studied in the southern beach, while during that of 1997 in both beaches. To analyze the activity, pitfall traps were used which were ordered along two transects extended between the upper beach and the resurgence zone. The traps were checked (i.e. collection of captured insects every two hours for a total period of 26 hours. The results showed that the adults of P. maculata were mostly active during the night hours, whereas the larvae were active during both, the day and night. Studies carried out in the beach located in south central Chile show that differences in the tidal range (neap vs. spring tides do not affect the activity patterns. During the locomotor activity, adult and larvae move to lower intertidal levels than those usually occupied while buried. Results of laboratory experiments using actographs under conditions of darkness and constant temperature, suggest that adults and larvae of P. maculata presented a circadian rhythm similar to that observed in the field experiments. It is concluded that P. maculata presents a behaviour that appear to be under control of an endogenous rhythm, without showing differences in the circadian rhythm of activity when beaches located at different latitudes are comparedSe estudió la actividad locomotriz del escarabajo Phalerisida maculata Kulzer (Coleoptera, Tenebrionidae sobre la superficie del sustrato de dos playas arenosas de la costa de Chile: una en el centro norte (ca. 29ºS y otra en el centro sur (ca. 39ºS. Durante el período estival de 1991 se estudió la actividad locomotriz circadiana en la playa del centro sur y durante el de 1997 en ambas playas. Para analizar

Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast Depósitos de algas varadas y artrópodos macroinfaunales en playas de arena de la costa de Chile

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EDUARDO JARAMILLO

2006-09-01

implications for sampling design of sandy beaches characterized by high inputs of algal wrack depositsSe muestrearon cuatro playas arenosas del litoral chileno durante el verano de 2000, para estudiar el rol de depósitos de algas varadas sobre las abundancias de las poblaciones de tres especies detritívoras de la macroinfauna que habita los niveles intermareales superiores de estas playas: el anfípodo talítrido Orchestoidea tuberculata Nicolet, el isópodo tílido Tylos spinulosus Dana y el insecto tenebriónido Phalerisidia maculata Kulzer. Las playas estudiadas fueron Apolillado (ca. 29º S, Quidico (ca. 38º S, Guabún y Mar Brava (ca. 42º S. Se recolectaron muestras replicadas con un cilindro plástico (25 cm de diámetro de los depósitos de algas, incluyendo el sedimento situado por debajo de los mismos y de zonas de la playa próximas a los acúmulos de algas pero carentes de las mismas. Las muestras se recolectaron en dos niveles de la playa, uno más próximo a la orilla con acúmulos de algas frescas y otro en la zona superior de la playa con algas secas. Los depósitos de algas varadas estuvieron compuestos principalmente por las algas pardas Macrocystis pyrifera (L., Durvillaea antarctica (Chamisso Hariot y Lessonia nigrescens Bory. O. tuberculata fue encontrada en los depósitos de algas y zonas de la playa cercanas a los mismos y estudiados en Apolillado, Quidico, Guabún y Mar Brava. Por otro lado, T. spinulosus fue recolectada solo en Apolillado, mientras que P. maculata ocurrió en los depósitos de algas y zonas de la playa cercanas a los mismos y analizados en Apolillado, Quidico y Guabún. En general, las abundancias medias de las tres especies fueron significativamente más altas en aquellas muestras recolectadas de los depósitos de algas y sedimentos subyacentes; i.e., 56, 61 y 14 veces más altas (promedios totales que en arenas sin restos de algas. Se concluye que las algas varadas sobre la superficie de la playa promueven un incremento de las

Inseguridad y Crisis Económica en el Imaginario Social de Playas de Rosarito, Baja California

OpenAIRE

Jesús Angel Enríquez Acosta; Alejandra Meza; Noelia Fierro

2015-01-01

Este trabajo ofrece un análisis acerca de como los habitantes de Playas de Rosarito en Baja California, imaginan y perciben el impacto de la crisis económica norteamericana mas reciente y la inseguridad mexicana en la actividad turística, principal vocación económica del lugar. Los testimonios de los habitantes expresan la transformación social, urbana y cultural del lugar turístico y de los problemas asociados a ciudades en rápido crecimiento. Se trata de una ciudad fronteriza con Estados Un...

Eva en el Paraíso: La construcción y representación del cuerpo femenino en la playa como espacio turístico en Costa Rica

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Esteban Barboza Núñez

2016-10-01

Full Text Available El artículo analiza la representación del cuerpo femenino como destino turístico, en la promoción de las playas en Costa Rica. Se hace un esbozo del estatus de la figura femenina en el imaginario androcéntrico occidental, desde sus raíces judeocristianas y de pensamiento clásico, hasta el advenimiento de la modernidad. Se reseñan postulados acerca del estatus del cuerpo femenino y la forma en que se construye en las representaciones gráficas; se parte de que la manera en que el cuerpo femenino es representado en la publicidad, enfocada a atraer turistas a la playa, le genera una doble otredad. La primera como mujer, cuyo físico es controlado por un imaginario androcéntrico que lo usa cual Eva-sirena, que tienta y atrae al posible visitante. La segunda como elemento que recrea una fantasía de exploración colonial de una playa prístina y “virginal”, y que la aleja de la modernidad racional cartesiana, en la cual la mente se impone a un cuerpo que debe ser controlado y domesticado por la razón.

Dispersión espacial de Plicopurpura patula pansa en playas rocosas del estado de Guerrero, México Spatial pattern of Plicopurpura patula pansa,in rocky shores of Guerrero, México

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Sergio García-Ibáñez

2007-10-01

Full Text Available Plicopurpura patula pansa es un caracol carnívoro característico de las costas rocosas del Pacífico mexicano. Presenta una glándula hipobraquial que secreta un fluido que adquiere una coloración púrpura en presencia de oxígeno y luz solar. Se determinó el arreglo espacial del caracol en playas que difieren en cuanto al tipo de sustrato, exposición al oleaje y pendiente de playa. Se calculó entre 0.1522 y 0.5435. Las menores fluctuaciones del Ip se presentaron en 5 playas que tienen en común sustratos fijos, gran cantidad de grietas y oquedades. Las mayores fluctuaciones correspondieron a 4 playas con sustratos móviles, como los cantos rodados.Plicopurpura patula pansa is a carnivore snail common of the Mexican Pacific rocky shores. Its hypobranchial gland produces a secretion that, in the presence of oxygen and sunlight, becomes purple. We determined the spatial distribution of the snail on beaches that differ in substratum, wave exposure, and the degree substratum’s inclination. The average snail density was calculated. Using the Morisita index (Id and the Morisita standardized index (Ip, we found that in 96.3% of the samples taken, the snails were distributed according to a patchy distribution. The rest of the time, their distribution was random. The I index oscillated between 0.1522 and 0.5435. Smaller fluctuations of the I index were observed in 5 beaches with substrata that were more stable and had a larger number of cracks and crevices than those on beaches with mobile substrata, such as rolled rocks.

El conocimiento de la Posidonia oceanica y sus funciones ecológicas como herramienta de gestión litoral. La realización de encuestas a los usuarios de playas y calas de la isla de Menorca

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Francesc Xavier Roig i Munar

2001-01-01

Full Text Available La Posidonia oceanica juega un papel primordial como producción de sedimento y defensa de las playas y calas de la isla de Menorca. La realización de encuestas de percepción a los usuarios de playa sobre el conocimiento y las funciones ecológicas de esta planta resulta una herramienta de gestión primordial para la conservación y mantenimiento de los espacios litorales insulares.

Uso de colifagos somáticos como indicadores de contaminación fecal en playas de “la Costa Verde”, Lima–Perú

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Hinsby Cadillo Quiroz

2014-06-01

Full Text Available El presente estudio fue realizado con el objetivo de evaluar el uso de los colifagos somáticos como indicadores de contaminación fecal en aguas recreacionales marinas. Los colifagos somáticos fueron cuantificados en 140 muestras provenientes de 5 playas del circuito de la “Costa Verde”, Lima, y correlacionados con los indicadores de contaminación fecal convencionales (Coliformes fecales, E. coli y Enterococos. Los colifagos fueron determinados por el método de “capa simple” previa aplicación de la técnica modificada de “filtración de la muestra” y utilizando a E. coli ATCC 13706 como cepa hospedero. Los Coliformes fecales (CF, E. coli (EC y Enterococos (EN fueron cuantificados por el método del Número Más Probable (NMP. Para efectos de análisis estadístico se consideró niveles de contaminación fecal en función de valores arbitrarios de <1000 CF/100 mL (“baja contaminación” y >1000 CF/100 mL (“alta contaminación”. Las playas evaluadas presentaron niveles de contaminación fecal de <3 a 2,4 x 105 CF y EC y <3 a 2,4 x 104 EN. En las muestras con “baja contaminación” fecal, el 32% de los recuentos de los colifagos fueron mayores que los de CF y EC; miemtras que en las muestras con “alta contaminación” ningún recuento de colifagos superó a los de CF o EC. Por otro lado, de acuerdo al análisis estadístico de componentes principales los colifagos y Enterococos fueron los mejores indicadores de contaminación fecal en las playas evaluadas. Asimismo, se determinó correlaciones estadísticamente significativas entre colifagos, CF y EC; siendo mayor en muestras con alta contaminación (r = 0,89 que en aquellas con baja contaminación (r = 0,43. Mediante la cuantificación de colifagos en las muestras evaluadas se determinó estadísticamente el valor de 115 UFP/100 mL como criterio calificativo de balneabilidad para las playas de la zona evaluada. De acuerdo a nuestros resultados los colifagos som

DISEÑO DE UNA PROPUESTA DE MARKETING ECOTURÍSTICO PARA EL MUNICIPIO DE LA PLAYA DE BELÉN COMO DESTINO TURÍSTICO

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Luis Alfonso Sánchez Borja

2014-06-01

Full Text Available El proyecto tiene como objetivo diseñar una propuesta de Marketing Ecoturístico para el Municipio de la Playa de Belén en el departamento de Norte de Santander, Colombia; se presentan los aspectos generales del Municipio, tales como; ubicación geográfica, topografía, aspectos étnicos y culturales. Seguidamente describe el análisis DOFA, la metodología y conceptos utilizados de mayor interés que aportan al desarrollo de la investigación con el fin de realizar un diagnóstico turístico sobre los componentes de intangibilidad turística, superestructura, infraestructura, planta turística, atractivos y descripción cultural de la comunidad de la Playa de Belén. Los resultados obtenidos se reflejan a través del análisis de mercado mediante encuesta aplicada a la comunidad, operadores y turistas, se analiza la situación actual, se diseña el plan de marketing creando unos objetivos, estrategias y recomendaciones de proyección para el municipio.

Academic performance study in young athletes from Playas de Castellón Athletics Club

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Ana Capdevila Seder

2014-03-01

Full Text Available The study analyzed the possible relationship between academic performance of young athletes and some of the variables most used in this field. The sample consisted of 40 athletes Athletics Club Playas de Castellón, between 14 and 16 years, 22 boys and 18 girls. The main variables analyzed were academic performance, study habits, gender, sleep, sedentary leisure, socioeconomic status and dedication to sport. The instruments used were questionnaires CHTE (habits and study skills, PFYTL (physical practice and use of leisure time and the Questionnaire for parents. The results showed that academic performance was positively correlated with the dedication to sport and negatively with sleep. In addition, the female gender had a higher performance than male.

Academic performance study in young athletes from Playas de Castellón Athletics Club

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Ana Capdevila Seder

2014-04-01

Full Text Available The study analyzed the possible relationship between academic performance of young athletes and some of the variables most used in this field. The sample consisted of 40 athletes Athletics Club Playas de Castellón, between 14 and 16 years, 22 boys and 18 girls. The main variables analyzed were academic performance, study habits, gender, sleep, sedentary leisure, socioeconomic status and dedication to sport. The instruments used were questionnaires CHTE (habits and study skills, PFYTL (physical practice and use of leisure time and the Questionnaire for parents. The results showed that academic performance was positively correlated with the dedication to sport and negatively with sleep. In addition, the female gender had a higher performance than male.

Implementación de sistemas de gestión integral sustentable para destinos turísticos, caso de estudio Parque Nacional Natural Utría, playa La Aguada – Colombia

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Fernando Gutiérrez-Fernández

2016-03-01

Full Text Available En el presente proyecto se diseñó e implementó un sistema de gestión integral sustentable para playa La Aguada, en tres niveles de gestión: estratégico, táctico y operacional; ya que se comparó dicha playa con una organización. Para el diseño del sistema, el primer paso fue determinar los requisitos establecidos en la NTS TS 001-2, que es la norma correspondiente en Colombia a la certificación de destinos turísticos de playa. Esta certificación busca mejorar, no solo las condiciones en el ámbito ambiental, sino que exista una transversalidad entre el componente ambiental, el socio-cultural, el económico y el de seguridad, contribuyendo al progreso y al mejoramiento de la calidad de vida de la comunidad anfitriona que se involucra directamente con la actividad del turismo. Playa La Aguada, se encuentra ubicada en el Parque Nacional Natural de Utría en el Departamento de Choco – Colombia y como destino turístico, tiene un principal atractivo que es el avistamiento de ballenas Jorobadas o Yubartas (Megaptera novaeangliae Sin embargo, en los últimos años esta actividad se ha visto complementada por la realización de otro tipo de actividades eco turísticas, para lo cual la Unidad Administrativa Especial del Sistema de Parques Nacionales Naturales ha construido cabañas de alojamiento y un centro de visitantes. Por lo que esta se ha convertido en el lugar donde se recibe la mayor cantidad de visitantes, en el área natural y cuyo flujo se da durante todo el año; de manera que es necesario trabajar en su organización, buscando que el turismo no se convierta a futuro en una actividad perjudicial.

Dispersión de la pluma de efluente sanitario en playa Boracéia, Sao Paulo

OpenAIRE

Pedrera Yanes, Jacqueline; Pinto Ortiz, Jayme; Siqueira Garciaz, Robinson

2014-01-01

Estudios de sistemas de emisarios submarinos son de gran importancia en Brasil, teniendo en cuenta la relación costo- beneficio y el impacto ambiental. El análisis técnico de esta opción debe ir acompañado de un análisis de impacto ambiental en la zona de descarga para adaptar el sistema a la legislación vigente, regulada en Brasil por el Consejo Nacional de Medio Ambiente. En este trabajo se estudia la posibilidad de implementación de un emisario submarino en la playa Boracéia. Fue realizada...

End-Pleistocene to Holocene paleoenvironmental record from piston corer samples and the challenge of stratigraphic correlation of playa sediment data with a connected alluvial apron from Damghan Basin, Iran

Science.gov (United States)

Büdel, Christian; Hoelzmann, Philipp; Wennrich, Volker; Majid Padashi, Sajed; Baumhauer, Roland

2015-04-01

The study yields a first characterization and correlation of the end-Pleistocene to Holocene sediment archive of playa and playa lake deposits in the Damghan Basin, northern Iran. The Basin sediments are deposited since Mio- and Pliocene, which is valid for the connected alluvial fans, too. These are covering the area between the playa and mountains and while prograding from the mountain ranges they deliver gravels and fine-sediments to the basins sink. The processes on the studied alluvial apron are described and dated already and can be explained in seven morphodynamic phases, which are linked to a general lake level high-stand in north-east Iran at about 8000-9000 years ago. If and how these phases are passed on from the alluvial record down to the playa sediment record is aim of this study. Today the salt pans margins are highly affected by salt tectonic drifting and access was suboptimal. Only here drilling could be performed through about 280 centimeters of salt-crust unfrequently intercalated with loamy layers. For yielding undisturbed playa sediment records sampling was performed with inliner-tubes deployed in a piston corer (Kullenberg type). Thus at two different drilling sites in summation seven cores could be taken, down to a maximum depth of 129 cm and 1000 cm. Back in Germany the cores had been opened and initially described, photographed and optically scanned with a core logger. Regarding future studies, the aim was a best possible comprehensive documentation of the cores. Therefore basically grainsize measurements (laser diffraction), multi element analyses (XRF, ICP-OES, titrimetry) and mineralogical measurements (XRD) had been deployed on samples taken from every single previously identified layer. Continuous elemental data was secured by use of a XRF-scanning core logger. The sedimentological description together with laboratory element analyses shows saline conditions in the first three meters coincide with general coarser grain sizes. The next

Biología pesquera de la langosta Panulirus gracilis en Playa Lagarto, Guanacaste, Costa Rica

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Helven Naranjo Madrigal

2011-06-01

Full Text Available Los parámetros biológicos y pesqueros analizados se fundamentaron en una muestra de 843 langostas provenientes de la actividad pesquera realizada en Playa Lagarto entre noviembre del 2007 y octubre del 2008. Las longitudes cefalotoráxicas de los machos estuvo comprendida entre los 143.6 y 42.8 y 115 y 35.8mm para hembras. El 74.9% de las langostas en los desembarques estuvo por debajo de la talla mínima legal de captura (80 mm de LC. La estructura de tallas muestra un considerable solapamiento de segmentos poblacionales y el incremento de las tallas con la profundidad en donde operan las dos modalidades de pesca estudiadas: el buceo a pulmón y el buceo con compresor. La proporción de sexos obtenida fue de 1.36 M:H. La relación entre LC y peso reveló que las hembras pesan más que los machos de una misma talla y que esta diferencia fue significativa (pBiology and fishery of the lobster Panulirus gracilis in Playa Lagarto, Guanacaste, Costa Rica. Panulirus gracilis is a high valuable lobster species with considerable captures along the tropical Pacific coast. In this study, I present some biological and fishery parameters described after a sample of 843 lobsters, landed in Playa Lagarto from November 2007 to October 2008. From landing records, a total of 74.9% of lobsters were below the minimum legal catch size (80mm CL. Carapace lengths were in the range of 42.8 and 143.6mm for males and 115 and 35.8mm for females. The size structure showed a wide overlapping of population segments, and a trend to increase with depth, where lung diving and “hooka” diving operations take place. Sex ratio was 1.36 M:H. The relationship between weight and LC revealed that females are heavier than males of the same size, and this difference was significant (p<0.05. The von Bertalanffy growth parameters for males and females respectively (K=0.45-0.38, LC∞=166.9-121.7 showed accelerated growth compared to other species. Males observed a higher growth rate

Efectividad del monitoreo de la anidación de tortugas marinas para determinar el éxito reproductivo en playas del sur de Cuba

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Julia Azanza-Ricardo

2015-07-01

Full Text Available El monitoreo de las anidaciones es muy útil como herramienta para la conservación pero el esfuerzo de trabajo en diferentes áreas puede variar grandemente. En Cuba, se aplican cuatro enfoques diferentes: monitoreo sistemático nocturno y diurno (MSN, y monitoreo esporádico con o sin comprobación de nidos (MECC. La cantidad y exactitud de los datos tomados y la calidad de la información derivada de ellos difieren. Por esta razón, en el presente trabajo se evalúa la efectividad de cada enfoque para determinar el éxito reproductivo de tortugas marinas en Cuba. El MSN sólo se realiza en las playas de anidación de la Península de Guanahacabibes, mientras que el MECC es el más extendido en el país. La porción de la temporada de anidación de cada una de las tres especies que anidan en Cuba (Chelonia mydas, Caretta caretta y Eretmochelys imbricata que se cubre con personal de monitoreo es baja para la mayoría de las playas, y sobre todo en el caso de E. imbricata. Se detectaron diferencias entre el monitoreo sistemático y esporádico, por tanto, la capacidad de detectar rastros falsos y verdaderos depende esencialmente de la frecuencia de monitoreo. Esto afecta la capacidad para evaluar el éxito de la anidación por playas. A pesar del incremento en los esfuerzos realizados en Cuba para el seguimiento de las principales colonias de anidación, se deben identificar nuevas estrategias para garantizar la correcta toma de información, y una mayor eficiencia del programa de monitoreo para obtener la mayor información posible de cada una de las especies con un adecuado balance de costo-beneficio.

Clasificación e impacto ambiental de los residuos sólidos generados en las playas de Riohacha, La Guajira, Colombia

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Elin Márquez Gulloso

2011-01-01

Full Text Available En la presente investigación se realizó una clasificación y valoración de impacto de los residuos sólidos generados en las playas de Riohacha, desde Valle de los Cangrejos hasta el Barrio Marbella. Se seleccionaron cinco estaciones de muestreo; en cada una se ubicaron transectos perpendiculares a la línea de costa; sobre estos se trazaron cuadrantes paralelos para la recolección de residuos sólidos. Además, se aplicaron encuestas a los usuarios y vendedores de las playas para determinar la percepción de olores ofensivos y se cuantificó la carga turística. Los datos de residuos se analizaron con el software estadístico SPSS 12,0 a través de la prueba Kruskal-wallis con el 97,5% de significancia y se valoró el impacto con el Método de Leopold (1971. En el inventario realizado los materiales que registraron mayor presencia fueron materia orgánica, plásticos, misceláneos y vidrios, siendo los residuos sólidos orgánicos los que obtuvieron mayor porcentaje. Las mayores concentraciones de usuarios se presentaron en la Zona Activa (ZA y Zona Pasiva (ZP, coincidiendo con la cantidad de residuos recolectados en cada estación de muestreo. Los olores ofensivos de mayor incidencia fueron basura, orina, excrementos humano y animal. La cantidad y el tipo de material están condicionados por las características del área y la influencia de actividades socioeconómicas. Las cantidades de residuos sólidos en las estaciones durante el 1º y 2º muestreo no presentaron diferencias significativas, siendo las principales causas de generación la disposición de desechos por residentes y visitantes, la pesca y la deposición de excrementos en la playa.

Aportes del turismo según los habitantes de las comunidades de Playas del Coco, Guanacaste y el Roble, Puntarenas

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Jorge Bartels Villanueva

2012-09-01

Full Text Available Este trabajo se basa en los artículos titulados “Impacto del Turismo, el caso de: El Roble 2 de Puntarenas” y “Allá en Playas del Coco; donde el turismo no fue amor de temporada”, que se obtuvieron a partir de la investigación realizada por el equipo del proyecto Desarrollo de la investigación INTERSEDES, mediante el estudio y el fortalecimiento del turismo sostenible en las provincias de Limón, Puntarenas y Guanacaste” desarrollado, durante el año 2009 y 2010, en las comunidades de Playas del Coco y el Roble 2 de Puntarenas. El objetivo de la investigación era determinar el impacto del turismo sobre estas comunidades y más específicamente se quería caracterizar a los hogares, conocer la composición de la población económicamente activa, conocer la fuente de los ingresos individuales y familiares y las opiniones que esa población tiene sobre el turismo, la cultura local y el papel de las instituciones locales en el desarrollo de esas comunidades. En nuestro caso queremos comparar esas mismas variables en dos focos de turismo nacional, con características diferentes, para determinar como ven esas comunidades al turismo como actividad de desarrollo local.

HOTELES DE TRELEW (CHUBUT, ARGENTINA HACIA EL DESARROLLO SUSTENTABLE DE LA ACTIVIDAD CON RESPONSABILIDAD SOCIAL

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Ana M. Gómez

2008-12-01

Full Text Available El trabajo se enmarca en el Proyecto de Investigación “Hotelería Sustentable en la Ciudad de Trelew, Provincia del Chubut, República Argentina” cuyo objetivo general es diseñar un sistema de Administración para la hotelería de Trelew, que viabilice su gestión en el marco del desarrollo sustentable de la actividad hotelera. Como hipótesis de trabajo se supuso que la hotelería estaría en condiciones de tener una gestión sustentable cuando demostrara poseer una cultura empresarial dirigida al desarrollo sustentable, llevando a cabo una actividad económica viable, con equidad social y respeto a los recursos naturales, culturales y de biodiversidad; es decir, con Responsabilidad Social Empresarial. Combinando la metodología de encuesta con la de entrevista en profundidad se abordó a la totalidad de los propietarios/administradores de los hoteles de la ciudad, sumando un total de diez. En la entrevista, además de recabar valiosa información por parte de los entrevistados, se les proporcionó un cuestionario que contenía preguntas pertinentes para la elaboración de indicadores de impacto. De los entregados fueron devueltos nueve cuestionarios, redefiniéndose de esta manera el universo a analizar. Los datos fueron trabajados en primer lugar en forma unidimensional, para detectar las categorías de mayor frecuencia de respuesta y se rescataron los resultados más significativos. Luego, dada la cantidad de indicadores involucrados (alrededor de 70 preguntas en el cuestionario, se hizo un estudio multidimensional con una técnica de escalonamiento multidimensional: la de componentes principales. Con este procedimiento estadístico se logra un índice de nivel de compromiso hacia el desarrollo sustentable de la actividad, que permite realizar un análisis comparativo entre los hoteles participantes. Por otra parte, la Provincia del Chubut categoriza a los hoteles desde 1980 de acuerdo a la infraestructura y comodidades ofrecidas. Hoy

Final Scientific/ Technical Report. Playas Grid Reliability and Distributed Energy Research

Energy Technology Data Exchange (ETDEWEB)

Romero, Van [New Mexico Institute Of Mining And Technology, Socorro, NM (United States); Weinkauf, Don [New Mexico Institute Of Mining And Technology, Socorro, NM (United States); Khan, Mushtaq [New Mexico Institute Of Mining And Technology, Socorro, NM (United States); Helgeson, Wes [New Mexico Institute Of Mining And Technology, Socorro, NM (United States); Weedeward, Kevin [New Mexico Institute Of Mining And Technology, Socorro, NM (United States); LeClerc, Corey [New Mexico Institute Of Mining And Technology, Socorro, NM (United States); Fuierer, Paul [New Mexico Institute Of Mining And Technology, Socorro, NM (United States)

2012-06-30

found that the benefits of net metering (like savings on investments in infrastructure and on meeting state renewables requirements) outweigh the costs (like the lowered revenue to cover utility infrastructure costs). Many are eagerly awaiting a California Public Utilities Commission study due later this year, in the hopes that it will provide a relatively unbiased look at the issue. Meanwhile, some states continue to pursue virtual net metering policies. Under Colorado’s Solar Gardens Act, for example, utility customers can subscribe to power generated somewhere other than their own homes. The program allowed by that bill sold out in 30 minutes, evidence of the pent-up demand for this kind of arrangement. And California solar advocates are hoping for passage of a “shared renewables” bill in that state, which would provide for similar solar are significant in bringing solar power to the estimated 75% (likely a conservative number) of can’t put solar on our own roof. As great a resource as the sun is, when it comes to actually implementing solar or other renewables, technology advances, policy changes, bureaucratic practices, and increased energy consciousness will all have to happen to achieve a 30% by 2050 national goal. This project incorporated research activities focused on addressing each of these challenges. First, the project researchers evaluated several leading edge solar technologies by actually implementing these technologies at Playas, New Mexico, a remote town built in the 1970s by Phelps Dodge Mining Company for the company’s employees. This town was purchased by the New Mexico Institute of Mining and Technology in 2005 and converted to a training and research center. Playas is an all-electric town served by a substation about seven miles away. The town is the last user on a 240 kV utility transmission line owned by the Columbus Electric Cooperative (CEC) making it easy to isolate for experiment purposes. The New Mexico Institute of Mining and

Crecimiento y desarrollo de una población infanto juvenil de la provincia de Chubut

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Torres, María Fernanda

1999-01-01

Full Text Available La diferenciación y adaptación ontogenética son temas centrales en antropología biológica por cuanto su modificación puede afectar la dinámica evolutiva poblacional. Numerosos factores estresantes actúan provocando variación en la expresión fenotípica y nuevas respuestas adaptativas. En el presente trabajo se determinó el crecimiento de niños de 5 a 14 años contrastando con estándares internacionales. La muestra se constituyó con 473 escolares de Río Mayo (Chubut, de ambos sexos. Se relevaron y calcularon variables corporales. Para la comparación con los estándares los datos fueron convertidos a escores z y contrastados además mediante pruebas de Wilcoxon. La estadística empleada consistió en análisis multifactorial de la varianza y pruebas de LSD. Si bien hubo crecimiento en todos los grupos etáreos analizados, los valores obtenidos difirieron significativamente de los correspondientes al estándar. En varones, a excepción del pliegue subescapular, que presentó escores z superiores al estándar las restantes variables se ubicaron entre 0 y -2 DS, siendo más afectadas las estaturas total y sentado y el área muscular. En mujeres, se observó una situación similar a excepción del área adiposa y la masa corporal, con valores mayores al estándar. Estos resultados evidencian la presencia de una desnutrición que abarca toda la franja etárea. La disminución de la talla y el aumento del tejido adiposo constituyen sin duda, respuestas adaptativas que permiten la supervivencia de los individuos frente a la injuria nutricional.

Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina

Science.gov (United States)

Gallego, Oscar F.; Cabaleri, Nora G.; Armella, Claudia; Volkheimer, Wolfgang; Ballent, Sara C.; Martínez, Sergio; Monferran, Mateo D.; Silva Nieto, Diego G.; Páez, Manuel A.

2011-02-01

A new Late Jurassic assemblage of “conchostracans”, ostracods, bivalves and caddisfly cases from the locality “Estancia La Sin Rumbo”, Chubut Province (Patagonia, Argentina) is recorded. The fossils occur in the upper part of an outcropping 45 m thick volcaniclastic lacustrine sequence of yellowish tuffs and tuffites of the Puesto Almada Member, which is the upper member of the Cañadón Asfalto Formation with U/Pb age of 161 ± 3 Ma. The sequence represents one sedimentary cycle composed of a (lower) hemicycle of expansion and a (higher) hemicycle of contraction of the water body. The invertebrates lived in small freshwater bodies during the periods of expansion of the lake. The occurrence of a great number of small spinicaudatans, associated with mud-cracks, is evidence of dry climatic conditions and suggests several local mortality events. The spinicaudatan record of the fushunograptid-orthestheriid (component of the Eosestheriopsis dianzhongensis fauna) and the presence of Congestheriella rauhuti Gallego and Shen, suggest a Late Jurassic (Oxfordian to Tithonian) age. Caddisfly cases are recorded for the first time in the Cañadón Asfalto Basin.

Las comunidades meiobentónicas en playas arenosas expuestas de la costa gallega (NO España), seis meses después del vertido de fuel del Prestige: importancia de los hidrocarburos aromáticos policíclicos (HAPs)

OpenAIRE

Veiga, Puri; Besteiro, Celia; Rubal, Marcos

2010-01-01

Este trabajo tiene como objetivo evaluar el efecto de los hidrocarburos aromáticos policíclicos (HAPs) en playas arenosas gallegas, seis meses después del vertido de fuel producido por el Prestige, utilizando el meiobentos a nivel de los grandes grupos zoológicos. Para llevar a cabo esta evaluación la comunidad meiobentónica, variables ambientales y el contenido en HAPs del sedimento fueron estudiados en seis playas intermareales afectadas y comparados con tres localidades de referencia. Tamb...

A Tenebrionid beetle's dataset (Coleoptera, Tenebrionidae) from Peninsula Valdés (Chubut, Argentina).

Science.gov (United States)

Cheli, Germán H; Flores, Gustavo E; Román, Nicolás Martínez; Podestá, Darío; Mazzanti, Renato; Miyashiro, Lidia

2013-12-18

The Natural Protected Area Peninsula Valdés, located in Northeastern Patagonia, is one of the largest conservation units of arid lands in Argentina. Although this area has been in the UNESCO World Heritage List since 1999, it has been continually exposed to sheep grazing and cattle farming for more than a century which have had a negative impact on the local environment. Our aim is to describe the first dataset of tenebrionid beetle species living in Peninsula Valdés and their relationship to sheep grazing. The dataset contains 118 records on 11 species and 198 adult individuals collected. Beetles were collected using pitfall traps in the two major environmental units of Peninsula Valdés, taking into account grazing intensities over a three year time frame from 2005-2007. The Data quality was enhanced following the best practices suggested in the literature during the digitalization and geo-referencing processes. Moreover, identification of specimens and current accurate spelling of scientific names were reviewed. Finally, post-validation processes using DarwinTest software were applied. Specimens have been deposited at Entomological Collection of the Centro Nacional Patagónico (CENPAT-CONICET). The dataset is part of the database of this collection and has been published on the internet through GBIF Integrated Publishing Toolkit (IPT) (http://data.gbif.org/datasets/resource/14669/). Furthermore, it is the first dataset for tenebrionid beetles of arid Patagonia available in GBIF database, and it is the first one based on a previously designed and standardized sampling to assess the interaction between these beetles and grazing in the area. The main purposes of this dataset are to ensure accessibility to data associated with Tenebrionidae specimens from Peninsula Valdés (Chubut, Argentina), also to contribute to GBIF with primary data about Patagonian tenebrionids and finally, to promote the Entomological Collection of Centro Nacional Patagónico (CENPAT

Algunos aspectos bio-ecológicos del "Muy Muy" Emerita analoga (Stimpson, 1857) (DECAPODA: ANOMURA) en playas al sur de Lima

OpenAIRE

Sánchez Rivas, Guadalupe

1988-01-01

Da a conocer algunos parámetros de la dinámica - poblacional de este crustáceo en la zona central del litoral peruano, tales como: estructura poblacional, densidad, crecimiento, reproducción, ciclo sexual y comportamiento. Así mismo, referir la comunidad biótica de la Playa arenosa estudiada y dar a conocer el valor nutritivo de la especie en cuestión. Tesis (Dr.). -- Universidad Nacional Mayor de San Marcos. Facultad de Biología

Anidación y manejo de la tortuga golfina (Lepidochelys olivacea en la playa La Cuevita, Bahía Solano, Chocó, Colombia

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Hinestroza, Lina María

2001-02-01

Full Text Available Durante la estación de anidación de 1999, documentamos algunos aspectos del comportamiento de anidación de la colonia de Lepidochelys olivacea que desova en la playa La Cuevita en el Pacífico colombiano. Adicionalmente, evaluamos los resultados del programa de maneje por transferencia y protección de nidos para esta estación reproductiva y lo comparamos con años anteriores. Todos los nidos depositados en esta playa que no logran ser transferidos al corral de protección. son depredados por humanos, al igual que una buena proporción de las hembras anidantes. Trasladamos 365 nidos (30197 huevos, de los 377 desoves registrados. El promedio del LCC de las hembras fue de 66 cm (SD= 2,47 y el promedio del número de huevos por nido fue de 102 (SD= 23,04. A diferencia de la estación de 1998, en la presente estación se presentó un pico de anidación evidente y la preferencia de anidación fue en la Lona media de la playa, seguida por la zona de lavado. El éxito de eclosión estimado con base en 304 de los 365 nidos transferidos fue de 71.4% y el éxito reproductivo de 71.8%. Las causas principales de mortalidad dentro del tortugario fueron: escaso o noto desarrollo embrionario. infestación de larvas de moscas en toda o parte de la nidada. asfixia de los neonatos por compactación de la arena. y picaduras por parte de hormigas. El intervalo de temperaturas de incubación estuvo entre los 28,9°C y los 29,4°C, con un promedio de 29.1°C, presentando 51 días de incubación. La evaluación de las proporciones sexuales neonatales de los nidos transferidos fue de 6: 1 en favor de los machos. Nuestros resultados indican que playa La Cuevita es un importante sitio de anidación de Lepidochelys olivacea en Sudamérica. Sin embargo, se deben seguir evaluando las estrategias de manejo empleadas para permitir la eclosión in situ de nidadas, mediante el control de las tasas de depredación humana, e intentar adelantar estudios para determinar

Geomorfologia Costera y Explotación de Arena de Playa en la Provincia de Buenos Aires y sus Consecuencias Ambientales

OpenAIRE

Silvia C. Marcomini; Rubén López

2006-01-01

El present trabajo tiene como objetivo principal caracterizar el medio físico de las áreas costeras, con el fin determinar los impactos en la hidrodinámica litoral, a mediano y corto plazo, generado por la explotación de arena de playa en las principales localidades costeras de la provincia de Buenos Aires, entre cabo San Antonio y Necochea. Para tal fin se describen las explotaciones mineras de mayor magnitud llevadas a cabo a lo largo de la costa de la provi...

Impacto de la luz artificial sobre la anidación de la tortuga marina Dermochelys coriacea (Testudines: Dermochelyidae, en playa Cipara, Venezuela

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María Rondón Médicci

2009-09-01

Full Text Available En Playa Cipara, Península de Paria, Venezuela, se evaluó el impacto de la luz artificial sobre la anidación de la tortuga cardón. Se estimó el número de anidaciones y su distribución espacial a lo largo de la playa entre los años sin y con iluminación artificial y entre segmentos de playa iluminada y oscura. Se hicieron entrevistas a los residentes para conocer su percepción sobre el impacto de la luz artificial hacia las tortugas marinas. Entre el 2000 y 2005 se registraron 1 217 salidas de tortuga cardón; con 1 056 nidos. El número de nidos con huevos dependió significativamente del año (p=0.035 al igual que el número de nidos totales (p=0.015. En los años previos a la electricidad (2000-2003 se observaron 743 salidas, de las cuales 661 con nido y 374 nidadas confirmadas. En los dos años (2004-2005 con iluminación artificial, se contaron 474 salidas con 395 nidos y 232 nidadas. La proporción de salidas con construcción de nido disminuyó significativamente (p=0.005 en los años con luz eléctrica, pero no varió el éxito de desove (p=0.402. No se encontró diferencia significativa entre el número de salidas por metro de playa en los sectores oscuros y los iluminados (p=0.244, ni entre el número de nidos construidos (p=0.379, ni entre las anidaciones con desove (p=0.516. Tampoco en la proporción de las salidas totales que constituyeron anidaciones (p=0.067 entre los sectores iluminados y oscuros, ni en la proporción de nidos exitosos (p=0.833. El volumen medio de arena por metro de playa fue mayor en La Peña, Cipara y La Remate y menor en Varadero (pImpact of artificial light on nesting in the leatherback turtle Dermochelys coriacea (Testudines: Dermochelyidae at Cipara beach, Venezuela. The number of Leatherback turtle nests and their spatial distribution was compared between years with and without artificial light, and between dark and lighted beach segments, in Cipara Beach, Paria Peninsula, Venezuela. Residents

Community structure of the intertidal meiofauna along a gradient of morphodynamic sandy beach types in southern Chile Estructura comunitaria de la meiofauna intermareal en un gradiente de tipos morfodinámicos de playas arenosas en el sur de Chile

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J. GERMÁN RODRÍGUEZ

2001-12-01

, the relationship between community structure of the meiofauna and beach morphodynamics, were similar to that found for the macroinfauna from different sandy beaches around the world, suggesting that meiofauna and macroinfauna are similarly affected by the physical processes associated to different beach typesSe estudiaron tres playas arenosas del sur de Chile (Gaviotas, Guabún y Mar Brava; ca. 42º S durante el verano del 2000 para analizar los patrones de abundancia y biomasa de la meiofauna a lo largo de un gradiente de tipos morfodinámicos de playas. Se recolectaron muestras de sedimento con cilindros metálicos (23 cm² de área, 120 cm de longitud en diez niveles espaciados a intervalos regulares a lo largo de seis transectos separados de 5 a 10 m y extendidos desde un punto sobre el nivel de marea alta y el nivel de marea baja. En cada nivel de muestreo se midió porosidad, fuerza de cizalla, contenido de agua, penetrabilidad y tamaño del grano. La meiofauna estuvo primariamente representada por Nematoda y Copepoda Harpacticoidea. Las mayores densidades y biomasas medias por unidad de área se encontraron en la playa reflectiva de Gaviotas (6.172 ind 10 cm-2 y 2,38 g m-2, peso seco libre de cenizas en comparación con la playa intermedia de Guabún (3.390 ind 10 cm-2 y 1,70 g m-2 y la playa disipativa de Mar Brava (3.667 ind 10 cm-2 y 0,86 g m-2. La abundancia y biomasa total de la meiofauna por metro lineal de playa (i.e., meiofauna total contenida en un transecto intermareal de 1 m de ancho fueron mayores en Mar Brava (506 x 10(6 ind m-1 y 119,4 g m-1 versus Gaviotas (271 x 10(6 ind m-1 y 101,7 g m-1 y Guabún (143 x 10(6 ind m-1 y 73,9 g m-1. Por lo tanto, estos últimos resultados muestran una tendencia de aumento de abundancia y biomasa de la meiofauna intermareal hacia el tipo disipativo dentro del gradiente estudiado de tipos de playas. Los valores más altos de densidad y biomasa de la meiofauna se encontraron en los niveles superiores y medio de cada

Los dueños del rebaño. Origen étnico y capacidad ovina en Chubut

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Fernando Coronato

2015-04-01

Full Text Available Continuando la línea de investigación inaugurada por Elsa Barbería en “Los dueños de la tierra” en Santa Cruz, avanzamos sobre la distribución de las diferentes comunidades étnicas y su parte en el poblamiento patagónico a partir del análisis cartográfico diacrónico. Para el último período del proceso utilizamos la base de datos del catastro del Chubut (2006 para evaluar « la capacidad ganadera» (entendida como la acumulación de hectáreas y ovinos de cada comunidad étnica. Estas fueron asociadas a los grupos patronímicos identificados previamente, a saber: alemán, bóer, británico (inglés y escocés, español, francés, galés, italiano, mapuche, polaco, tehuelche y vasco. Las Sociedades Anónimas se consideraron como un grupo aparte. Del tratamiento estadístico de los datos se obtuvo la superficie media de las (más de 2000 propiedades, la talla media del rebaño y la cosecha de lana de cada grupo, detectándose diferencias significativas entre algunos de ellos. Las Sociedades Anónimas se despegan solitarias hacia los latifundios, mientras que en el extremo opuesto se ubican los grupos aborígenes, arrinconados en los minifundios y la subsistencia. Estos datos relativamente actuales muestran la continuidad de los procesos identificados en el análisis catastral de etapas previas del poblamiento que se remontan a más de un siglo.

LESIONES PULPARES Y PERIAPICALES EN ESCOLARES DEL AREA DE ATENCION DEL POLICLINICO DOCENTE DE PLAYA. CIUDAD DE LA HABANA

OpenAIRE

Betancourt Núñez, Marisette; Fernández González, María del Carmen; Valcarcel Llerandi, Julio

2009-01-01

La presente investigación tiene como objetivo conocer la incidencia de las lesiones pulpares y periapicales y sus causas en escolares de la enseñanza primaria del área del Policlínico Docente de Playa. La referida investigación es de tipo observacional descriptiva. La población estudiada fue de 1 137 alumnos entre 4 y 12 años de edad, a la cual se le realizó un examen bucal para determinar la presencia de patologías pulpares y periapicales, y su relación con algunas variables clínicas. Result...

Estudio del rendimiento académico en atletas adolescentes del Club de Atletismo Playas de Castellón

OpenAIRE

Capdevila Seder, Ana; Bellmunt Villalonga, Hector; Hernando Domingo, Carlos

2014-01-01

El estudio analizó la posible relación entre el rendimiento académico de jóvenes atletas y algunas de las variables más utilizadas en este campo. La muestra estaba compuesta por 40 atletas del Club de Atletismo Playas de Castellón, con edades comprendidas entre 14 y 16 años, 22 hombres y 18 mujeres. Las principales variables analizadas fueron el rendimiento académico, los hábitos de estudio, el género, las horas de sueño, el ocio sedentario, el nivel socioeconómico y la dedicación al deporte....

A Tenebrionid beetle’s dataset (Coleoptera, Tenebrionidae from Peninsula Valdés (Chubut, Argentina

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German Cheli

2013-12-01

Full Text Available The Natural Protected Area Peninsula Valdés, located in Northeastern Patagonia, is one of the largest conservation units of arid lands in Argentina. Although this area has been in the UNESCO World Heritage List since 1999, it has been continually exposed to sheep grazing and cattle farming for more than a century which have had a negative impact on the local environment. Our aim is to describe the first dataset of tenebrionid beetle species living in Peninsula Valdés and their relationship to sheep grazing. The dataset contains 118 records on 11 species and 198 adult individuals collected. Beetles were collected using pitfall traps in the two major environmental units of Peninsula Valdés, taking into account grazing intensities over a three year time frame from 2005–2007. The Data quality was enhanced following the best practices suggested in the literature during the digitalization and geo-referencing processes. Moreover, identification of specimens and current accurate spelling of scientific names were reviewed. Finally, post-validation processes using DarwinTest software were applied. Specimens have been deposited at Entomological Collection of the Centro Nacional Patagónico (CENPAT-CONICET. The dataset is part of the database of this collection and has been published on the internet through GBIF Integrated Publishing Toolkit (IPT (http://data.gbif.org/datasets/resource/14669/. Furthermore, it is the first dataset for tenebrionid beetles of arid Patagonia available in GBIF database, and it is the first one based on a previously designed and standardized sampling to assess the interaction between these beetles and grazing in the area. The main purposes of this dataset are to ensure accessibility to data associated with Tenebrionidae specimens from Peninsula Valdés (Chubut, Argentina, also to contribute to GBIF with primary data about Patagonian tenebrionids and finally, to promote the Entomological Collection of Centro Nacional Patag

A Tenebrionid beetle’s dataset (Coleoptera, Tenebrionidae) from Peninsula Valdés (Chubut, Argentina)

Science.gov (United States)

Cheli, Germán H.; Flores, Gustavo E.; Román, Nicolás Martínez; Podestá, Darío; Mazzanti, Renato; Miyashiro, Lidia

2013-01-01

Abstract The Natural Protected Area Peninsula Valdés, located in Northeastern Patagonia, is one of the largest conservation units of arid lands in Argentina. Although this area has been in the UNESCO World Heritage List since 1999, it has been continually exposed to sheep grazing and cattle farming for more than a century which have had a negative impact on the local environment. Our aim is to describe the first dataset of tenebrionid beetle species living in Peninsula Valdés and their relationship to sheep grazing. The dataset contains 118 records on 11 species and 198 adult individuals collected. Beetles were collected using pitfall traps in the two major environmental units of Peninsula Valdés, taking into account grazing intensities over a three year time frame from 2005–2007. The Data quality was enhanced following the best practices suggested in the literature during the digitalization and geo-referencing processes. Moreover, identification of specimens and current accurate spelling of scientific names were reviewed. Finally, post-validation processes using DarwinTest software were applied. Specimens have been deposited at Entomological Collection of the Centro Nacional Patagónico (CENPAT-CONICET). The dataset is part of the database of this collection and has been published on the internet through GBIF Integrated Publishing Toolkit (IPT) (http://data.gbif.org/datasets/resource/14669/). Furthermore, it is the first dataset for tenebrionid beetles of arid Patagonia available in GBIF database, and it is the first one based on a previously designed and standardized sampling to assess the interaction between these beetles and grazing in the area. The main purposes of this dataset are to ensure accessibility to data associated with Tenebrionidae specimens from Peninsula Valdés (Chubut, Argentina), also to contribute to GBIF with primary data about Patagonian tenebrionids and finally, to promote the Entomological Collection of Centro Nacional Patag

Concentración de metales pesados (Cu, Ni, Zn, Cd, Pb en la biota y sedimentos de una playa artificial, en la bahía San Jorge 23°S, norte de Chile Heavy metals concentration (Cu, Ni, Zn, Cd, Pb, in biota and sediments of an artificial beach, in San Jorge bay 23°S, northern Chile

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Gabriel Castro

2012-07-01

Full Text Available Se evaluó el contenido de metales pesados (Cu, Ni, Zn, Cd, Pb en la biota y el sedimento de una playa artificial (Paraíso y una playa natural (El Lenguado, ubicadas en la bahía San Jorge, norte de Chile. Los resultados fueron utilizados para comparar ambos sistemas, el grado de cumplimiento de la normativa ambiental nacional e internacional, y el efecto de la construcción de la playa artificial sobre el nivel de contaminación por metales existentes históricamente en esa zona. En cada playa se ubicaron estaciones equidistantes que abarcaron desde el intermareal hasta el submareal de las cuales fueron extraídos los organismos. Se tomaron muestras de sedimento en cada playa y se determinaron las pendientes con el método de Emery. El análisis granulométrico evidenció el predominio de arena media en playa El Lenguado, y arena media y fina en playa Paraíso. El contenido de materia orgánica fue mayor en El Lenguado. En playa Paraíso se determinaron cinco phylum/superclase agrupados en 19 taxa, mientras que en El Lenguado se encontraron cuatro phylum/superclase agrupados en cc taxa. El contenido de metales en sedimentos y en la mayoría de organismos presentó valores mayores en playa Paraíso. Estos resultados, junto a las normas de calidad chilenas y norteamericanas, sugieren un evidente deterioro en la calidad ambiental de playa Paraíso lo que se demostró por un incremento en las concentraciones de estos metales desde su construcción, los que sobrepasan los límites establecidos por ambas normas.It was evaluated the heavy metal content (Cu, Ni, Zn, Cd, Pb in biota and sediment of an artificial beach (Paraíso and a natural beach (El Lenguado, both located in San Jorge bay, northern Chile. The results were used to compare both systems, the degree of fulfillment of national and international environmental regulations, and the effect of the construction of the artificial beach on the level of metal contamination historically existing in

Análisis de la gestión de riesgos de un proyecto de inversión pública en turismo de sol y playa durante su fase de inversión: El caso del proyecto acondicionamiento turístico de la playa de centro Máncora

OpenAIRE

Duran Cárdenas, Dacio; Duran Cárdenas, Dacio; Aparicio Acurio, Manuel; Duran Cárdenas, Dacio

2012-01-01

La presente investigación, tiene como finalidad estructurar una propuesta que permita una mejor gestión en la ejecución de un proyecto de inversión pública en turismo de sol y playa. Para lograr esto, el estudio hace uso del análisis de riesgos, el mismo que logra identificar y analizar cualitativa y cuantitativamente los riesgos durante la ejecución de un proyecto turístico, y de esta manera minimizar los eventos de riesgo negativos (amenazas) y maximizar los eventos de riesgo positivos (opo...

Anidación de la tortuga Dermochelys coriacea (Testudines: Dermochelyidae en playa Gandoca, Costa Rica (1990 a 1997

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Didiher Chacón Chaverri

1999-06-01

Full Text Available La anidación de la tortuga baula fue estudiada en playa Gandoca, una importante playa de anidación de tortugas marinas localizada al sureste de la costa Caribeña de Costa Rica, dentro de los límites del Refugio Nacional de Vida Silvestre Gandoca/Manzanillo (82° 37' O, 09° 37' N. Entre 1990 y 1997, se desarrollaron campañas de observación de la anidación entre los meses de febrero a julio de cada año; 16 variables de la anidación fueron anotadas y una parte de la colonia fue marcada con marcas monel y 3 484 nidos fueron encontrados; durante este periodo se depositaron un promedio de 534 nidos por temporada, 1,135 nidos fue el máximo de anidación anual, mientras que 226 nidos fue el mínimo, el 20.8% de los nidos fueron relocalizados en los viveros. El promedio de la longitud curva del caparazón de las hembras fue de 154.65 cm y el promedio del ancho curvo del caparazón fue de 112.83 cm. Las observaciones mostraron que el promedio de huevos normales para este periodo fue de 79.28, mientras que el promedio de huevos vanos fue de 35. La recolección ilegal de huevos, la basura sobre la playa y la erosión intensiva son parte de los problemas más importantes que están causando el declive de las tortugas en Gandoca.The nesting of the leatherback sea turtle was studied in Gandoca Beach, an important nesting beach on the southeastern Caribbean coast of Costa Rica, in the Gandoca/Manzanillo National Wildlife Refuge. Nesting was recorded from 1990 to 1997 (each February through July. Nesting peaked in April and May (depending on the year; 16 biological paramenters were recorded and part of the rookery was tagged with monel tags. During this period 1 045 females were studied and 3 484 nests were recorded; 534 nests was the yearly mean, (range 226-1 135, 20.8 % of the nests were relocated to hatcheries, as a conservation effort to prevent loss of nests. Mean curve carapace length was 154.65 cm and width 112.83 cm. Mean normal number of eggs

Rehabilitación de edificios bajo objetivos de reducción de impacto ambiental: un caso piloto de vivienda plurifamiliar en el área de Playa de Palma, Mallorca

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Wadel, G.

2011-10-01

Full Text Available This article presents briefly the work Pilot study to reduce environmental impact: evaluation and assessment of a sustainable refurbishment of an existing residential building in Playa de Palma carried out by the Consortium of Palma Beach. It will be explained by how the environmental impacts of the building can be reduced by 50% or more as a result of future refurbishment and subsequent management, referring to both its current situation and refurbishment standards in residential buildings. It also includes an approximated evaluation of the CO₂ emission reduction achieved in the building life cycle and the projected costs for the various actions of the refurbishment model proposed by the Consortium, to be carried out in other renovation operations in Palma Beach.

Este artículo resume el estudio Experiencia piloto para la reducción del impacto ambiental: evaluación y asesoramiento a la rehabilitación sostenible de un edificio de viviendas existente en Playa de Palma realizado para el Consorci de Platja de Palma. Se explica a través de qué medidas es posible reducir en un 50% o más los impactos ambientales del edificio como producto de su futura rehabilitación y posterior gestión respecto tanto de su situación actual como de los estándares de rehabilitación al uso en edificios de vivienda. Asimismo, se incluye también una aproximación a las reducciones de emisiones de CO₂ que se consiguen en el ciclo de vida del edificio y a los costes previstos para las distintas actuaciones del modelo de rehabilitación que el citado consorcio propone para las operaciones de rehabilitación a llevarse adelante en Playa de Palma.

Niveles y distribución de metales pesados en el agua de la zona de playa de Riohacha, La Guajira, Colombia

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Carlos Doria Argumedo

2015-03-01

Full Text Available La zona de playa de Riohacha, La Guajira, Colombia, constituye un ecosistema muy rico, diverso y productivo, dotado de gran capacidad para proveer bienes y servicios que sostienen actividades como pesca, turismo y navegacion; sin embargo, experimenta problematicas ambientales producto de la dinamica de la ciudad, relacionadas con la infiltración de aguas residuales, acumulacion de residuos solidos organicos y descargue de sedimentos del rio Rancheria. En la metodologia de esta investigación se tomaron muestras de agua de mar en cuatro puntos de un sector de aproximadamente 2.5 km de playa, durante ocho meses en el ano 2013, en epocas de lluvia y sequia. Los metalesanalizados fueron Cobalto, Cobre, Zinc, Aluminio, Manganeso, Niquel y Hierro. Las concentraciones de los metales Ni y Zn, considerados muy toxicos, se encontraron por encima de los niveles segun la normativa nacional y algunas establecidas a nivel internacional, para efectos agudos en aguas marinas y estuarinas destinadas a la preservacion de fauna y flora; las concentraciones de Cu y Zn, se encuentran por debajo de los limites establecidos por la EEA y la EPA. La correlacion significativa existente entre las concentraciones de los metales Fe, Mn, Zn, Co con los nutrientes nitrato y fosfato, indica posible acumulacion de ellos en el sedimento e incluso bioacumulacion en la fauna asociada a esta zona. La presencia y concentraciones de los metales son producto, principalmente, de la intervención humana en las labores de mineria y en el ciclo biogeoquimico de los metales.

Depositional Environments of Late Danian Plant Localities: Chubut Provice, Patagonia, Argentina

Science.gov (United States)

Comer, E.; Slingerland, R. L.; Wilf, P.

2010-12-01

Diverse, well-preserved macroflora are observed within Cretaceous and Paleocene sediments of Chubut Province, Patagonia, Argentina. These macroflora are the most well preserved early Paleocene flora from Gondwana and add new insight into the diversity and environments of that epoch. Two major sites of fossil preservation, Palacio de los Loros and Parque Provincial Ormachea, sit near the top of the Late Danian (65.5-61.7 Ma) Salamanca Formation. Understanding the depositional history of the Salamanca is important in characterizing paleoenvironments in which these flora lived and relating these Patagonian macroflora to concurrent Paleocene flora within the Gondwanan supercontinent. During a two week field season, twenty stratigraphic sections were measured along the outcrop belt at Palacio de los Loros and Ormachea Park as well as two minor sites; Las Flores, and Rancho Grande. Photo mosaics, laser ranger data, and stratigraphic columns were merged with elevated geologic maps and imported into Fledermaus to generate a 3-D visualization of facies relationships. Rock samples were also collected and will be thin sectioned and analyzed for petrography and grain size. The Salamanca Fm. consists of 7 facies, listed here in stratigraphically ascending order: 1)Transgressive sands, 2)Wispy-bedded claystone, 3)Banco Verde, 4)White Cross bedded sandstone, 5)Accretion set siltstone, 6)Transitional silty claystone and 7)Banco Negro. Based on these facies, the Salamanca Fm. is interpreted as a marine-shelf to brackish, tide-dominated, estuarine deposit. The base of the Salamanca Fm. rests on an unconformity representing a marine flooding surface and lower sections of the Salamanca, facies 1 and 2, contain abundant glauconite and fossils indicative of a marine shelf environment. These facies give way upwards to bi-directional trough cross bedded sandstones interspersed with flaser bedded sandy siltstones (facies 3 and 4) indicating a less marine estuary with strong flow regimes

Plantas Medicinales en el Parque Nacional los alerces, Chubut, Patagonia Argentina

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Carolina Toledo

2012-12-01

Full Text Available El objetivo de este estudio fue identificar las plantas con valor medicinal empleadas por los antiguos pobladores del Parque Nacional Los Alerces y relacionarlas con la riqueza específica de plantas medicinales presentes en el área. Se entrevistaron 16 pobladores asentados en la Reserva Nacional que tenían conocimiento de las plantas medicinales, más allá de que hicieran uso o no de las mismas. Las entrevistas fueron semiestructuradas, completadas de manera escrita e individual por el entrevistador. Las mismas incluían diez preguntas que recopilaban información respecto a las especies usadas como medicina, modo de preparación y aplicación, frecuencia de uso, localización de las plantas en el ámbito del área protegida, forma de obtención de las especies, y el modo de adquisición de los conocimientos respecto a las plantas. Los pobladores mencionaron el uso de 42 especies con valor medicinal, distribuidas en 24 familias, de las cuales las mejor representadas fueron Lamiaceae (21,4% y Asteraceae (14,2%. En cuanto al origen de las plantas medicinales citadas por los pobladores, el 58, 5% correspondió a especies exóticas. Los usos más frecuentes fueron para trastornos del sistema digestivo, seguido en orden decreciente y en menor proporción para tratar afecciones respiratorias, cardiovasculares y de la piel. Al comparar la riqueza total de especies medicinales presentes en el Parque y las registradas a partir de las entrevistas, se observa que se hace uso de un 28,6% de lo disponible en el área.Medicinal plants in The Alerces National Park, Chubut, Argentinean Patagonia. The aim of this study was to identify the medicinal plants used by the old residents in The Alerces National Park and to relate this information with medicinal species richness in the area. An interview was employed with 16 local people settled in the National Reserve who had knowledge of medicinal plants, past or not to make use of them. The interviews were semi

Composición corporal de escolares pertenecientes a diferentes contextos socioeconómicos de Puerto Madryn, Chubut, Argentina

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Dahinten, Silvia Lucrecia

2007-01-01

Full Text Available El desigual desarrollo del tejido muscular y de la distribución de tejido adiposo que tiene lugar durante el crecimiento humano presenta dimorfismo sexual (DS, en condiciones de vida saludables. Esta variación ha sido traducida en algoritmos utilizando la circunferencia y pliegues subcutáneos del brazo y se han elaborado ecuaciones para calcular áreas. El objetivo fue evaluar el DS observado en el crecimiento corporal de escolares de 6 a 14 años de hogares con diferente NBI -(NBI alto y (NBI bajo-. Se estudió transversalmente una muestra de 500 mujeres y 570 varones de la ciudad de Puerto Madryn, Chubut. Se relevaron: perímetro braquial y pliegues subcutáneos tricipital y subescapular y se calcularon las áreas adiposa (AAB y muscular (AMB. Se utilizaron pruebas de Wilcoxon, p= 0.05. El AAB de las mujeres fue a casi todas las edades superior a la de los varones (NBI bajo p=0.09; NBI alto p=0.02. A edades tempranas, el AMB mostró que los varones presentaron cifras similares a las mujeres. A partir de los 12 años, sin embargo, los varones comenzaron a incrementar la masa muscular. En las niñas este aumento se hizo mucho más lento (NBI alto p=0.01; NBI bajo p=0.03. La ausencia de DS en el NBI bajo, para los caracteres considerados, se relaciona con el aumento de tejido adiposo en los varones de este sector que muestra la adopción dentro de la comunidad, de dietas de alto contenido en grasas y carbohidratos acompañadas de altas tasas de obesidad.

Modeling aluminum-silicon chemistries and application to Australian acidic playa lakes as analogues for Mars

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Marion, G. M.; Crowley, J. K.; Thomson, B. J.; Kargel, J. S.; Bridges, N. T.; Hook, S. J.; Baldridge, A.; Brown, A. J.; Ribeiro da Luz, B.; de Souza Filho, C. R.

2009-06-01

Recent Mars missions have stimulated considerable thinking about the surficial geochemical evolution of Mars. Among the major relevant findings are the presence in Meridiani Planum sediments of the mineral jarosite (a ferric sulfate salt) and related minerals that require formation from an acid-salt brine and oxidizing environment. Similar mineralogies have been observed in acidic saline lake sediments in Western Australia (WA), and these lakes have been proposed as analogues for acidic sedimentary environments on Mars. The prior version of the equilibrium chemical thermodynamic FREZCHEM model lacked Al and Si chemistries that are needed to appropriately model acidic aqueous geochemistries on Earth and Mars. The objectives of this work were to (1) add Al and Si chemistries to the FREZCHEM model, (2) extend these chemistries to low temperatures (enthalpy data. New aluminum and silicon parameterizations added 12 new aluminum/silicon minerals to this Na-K-Mg-Ca-Fe(II)-Fe(III)-Al-H-Cl-Br-SO 4-NO 3-OH-HCO 3-CO 3-CO 2-O 2-CH 4-Si-H 2O system that now contain 95 solid phases. There were similarities, differences, and uncertainties between Australian acidic, saline playa lakes and waters that likely led to the Burns formation salt accumulations on Mars. Both systems are similar in that they are dominated by (1) acidic, saline ground waters and sediments, (2) Ca and/or Mg sulfates, and (3) iron precipitates such as jarosite and hematite. Differences include: (1) the dominance of NaCl in many WA lakes, versus the dominance of Fe-Mg-Ca-SO 4 in Meridiani Planum, (2) excessively low K + concentrations in Meridiani Planum due to jarosite precipitation, (3) higher acid production in the presence of high iron concentrations in Meridiani Planum, and probably lower rates of acid neutralization and hence, higher acidities on Mars owing to colder temperatures, and (4) lateral salt patterns in WA lakes. The WA playa lakes display significant lateral variations in mineralogy and water

Las relaciones sociales en la Meseta Norte de Chubut (1930-1970. Un abordaje desde la perspectiva poscolonial

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Ana María Troncoso

2012-01-01

Full Text Available Nuestro propósito es trabajar con determinados conceptos de la crítica poscolonial para intentar alguna interpretación y explicación acerca de las agencias posibles en los sujetos destinatarios de lo que llamamos «proyecto civilizador» del Estado argentino en la Meseta Central del norte de la provincia del Chubut, Argentina. En el período que proponemos revisar (1930-1970 las familias de la meseta chubutense fueron expuestas a una dinámica importante respecto a los medios de vida (fundamentalmente la tierra, como consecuencia del desarrollo del mercado y de la creciente presencia del estado. Para este trabajo hemos recurrido mayormente a relatos orales, además de documentos oficiales y biografías publicadas, que indican cambios relevantes en la constitución familiar, en especial en lo referente a la conformación de parentelas y a las características de las relaciones familiares y comunitarias. El relevamiento oral ha permitido construir historias de familias tendiendo a la reinterpretación que produce la memoria, con las negociaciones y reevaluaciones de lo acontecido y experimentado, exponiendo la puesta en práctica de racionalidades, estrategias versátiles y resignificaciones en este contexto dinámico, observables en la trama intergeneracional. Mediante los relatos se pueden historizar las comunidades, las parentelas, las familias y los individuos, escapando a la fascinación que producen las fuentes oficiales y sus derivados de sectores dominantes o serviles a él, cuya inercia hacia un enfoque teleológico implica desechar los temas y problemas que parecen estadios inferiores y superados, y que deja al margen a estos pobladores, estereotipándolos, generando un vacío de Historia. Así es que, estas voces legítimas y necesarias relativizan la linealidad de un proceso que supone imposiciones sin contrapuntos obligándonos a reflexionar sobre los posicionamientos y decisiones de grupos sociales subalternos y otrificados sobre

Actividad antimicrobiana de bacterias ácido lácticas aisladas de invertebrados marinos de la costa del Chubut (Patagonia – Argentina

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Parada Romina

2017-11-01

Full Text Available Se estudió la actividad antagonista de cepas de bacterias ácido lácticas (BAL aisladas de invertebrados marinos de la costa del Chubut. Dentro de los 92 aislamientos, 22 exhibieron actividad, de las cuales 3 cepas se clasificaron como Lactobacillus y 19 como Enterococcus. En todos los casos, después de la neutralización con NaOH y tratamiento térmico, la actividad inhibitoria del sobrenadante libre de células de las cepas estudiadas permaneció activa. El tratamiento con lisozima y catalasa no afectó la actividad antimicrobiana; sin embargo la actividad enzimática de la tripsina abolió la acción inhibitoria de los sobrenadantes, confirmando la naturaleza proteica de los compuestos activos. Las actividades contra Listeria inocua ATCC 33090 logradas por cepas de Enterococcus variaron entre 640 y 163.840 unidades arbitrarias/mililitro (AU/ml, mientras que las cepas de Lactobacillus exhibieron actividades entre 20 y 40 AU/ml. Las cepas E. mundtii 278Pe, E. hirae 463Me y E. hirae 471Me exhibieron las actividades inhibitorias más altas contra un amplio espectro de bacterias patógenas y/o contaminantes de alimentos. A pesar de la amplia información disponible sobre estos microorganismos, existen pocos estudios de BAL aisladas a partir de invertebrados de origen marino. Los resultados obtenidos en este estudio sugieren que esta fuente puede contribuir al hallazgo de nuevas bacteriocinas con potencial uso en la industria alimentaria.

Invertebrados asociados al coral constructor de arrecifes Pocillopora damicornis en Playa Blanca, Bahía Culebra, Costa Rica Invertebrates associated with the reef-building coral Pocillopora damicornis at Playa Blanca, Bahía Culebra, Costa Rica

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Juan José Alvarado

2012-04-01

Full Text Available Los arrecifes coralinos son uno de los ecosistemas más diversos en el planeta, tanto por los organismos constructores como por aquellos que viven encima, sobre, dentro y debajo de ellos. Los corales del genero Pocillopora son reconocidos mundialmente por albergar una importante fauna de invertebrados entre sus ramas, los cuales son considerados como simbiontes obligatorios en una gran cantidad de casos. La presente investigación describe la fauna de invertebrados asociados al coral Pocillopora damicornis en Bahía Culebra, Costa Rica, describiendo sus densidades, frecuencias, riquezas y diversidades a través del tiempo. Para esto se colectaron 5 colonias cada 3-4 meses en Playa Blanca, Bahía Culebra. En total se encontraron 448 individuos en 35 especies, siendo Harpiliopsis depressa, Lithophaga aristata, Trapezia ferruginea, Alpheus lottini, Fennera chacei, y Petrolisthes haigae las especies predominantes. Noviembre fue el mes en el que se encontraron los mayores valores en los índices de riqueza, diversidad y diferenciación taxonómica, mientras que agosto fue el que presento los valores más bajos de todos. En términos generales, la época lluviosa mostro mayor riqueza de especies que la época seca. Así mismo, las especies colectados y los valores obtenidos son muy similares a otras zonas del Pacifico Oriental Tropical. Culebra ha venido sufriendo una perdida en la cobertura coralina, que podría tener consecuencias en la diversidad y abundancia de organismos asociados a corales. Estas consecuencias incluyen perdida en la fecundidad de estos organismos, una reducción en su función como limpiadores y protectores de depredadores del coral, poniendo en riesgo su diversidad, lo que puede afectar los stocks de peces depredadores que depende de ellos. Realizar monitoreos permanentes de la criptofauna asociada al coral Pocillopora va a ser determinante para cuantificar perdidas o recuperaciones en la composición de invertebrados asociados

Regional exploration for channel and playa uranium deposits in Western Australia using groundwater

International Nuclear Information System (INIS)

Noble, R.R.P.; Gray, D.J.; Reid, N.

2011-01-01

Shallow calcrete aquifers in the central north of the Yilgarn Craton in Western Australia are the host to numerous secondary carnotite U deposits. Sampling and analysis of approximately 1400 shallow aquifer groundwaters were conducted to test if U mineralisation of this type may be found using a >5 km sample spacing. Results show this can be achieved. All the economic deposits and most of the minor deposits and occurrences are associated with groundwater that has carnotite (KUO 2 VO 4 ) approaching or exceeding saturated conditions. Soluble U concentrations alone identified the largest deposit (Yeelirrie) and several smaller deposits, but this parameter was not as successful as the mineral saturation indices. Palaeodrainage distribution and thickness of cover combined with surface drainage and catchment boundaries provided background information of U primary sources and for areas with the highest exploration potential for channel and playa U deposits. Granites in the SE of the study area are less prospective with regard to secondary U deposits. Groundwater geochemistry in conjunction with palaeodrainage mapping may greatly improve exploration through cover where radiometric geophysics is not effective. The study of regional, shallow groundwater for U shows multiple benefits for mineral exploration, the economy and potable water quality.

Efectos de la instalación de un gasoducto sobre algunas propiedades del suelo superficial y la cobertura vegetal en el NE de Chubut Gas-pipeline installation effects on superficial soil properties and vegetation cover in Northeastern Chubut

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Esteban Kowaljow

2008-07-01

Full Text Available En este trabajo describimos el impacto del tendido de un gasoducto y de la reposición parcial del material removido, sobre algunas propiedades físicas y químicas del suelo y sobre la cobertura vegetal en tres sitios ecológicos del nordeste de Chubut. En cada sitio se identificaron 4 zonas diferentes: zona 1, faja desmontada y compactada por el tránsito de maquinaria pesada; zona 2, faja desmontada, con posterior reposición del suelo y la vegetación removidos; y otras dos zonas correspondientes a la estepa adyacente no disturbada: montículos asociados a arbustos y espacios entre montículos. Los mayores valores de densidad aparente se encontraron en los suelos de la zona 1 y en los del entremontículo (1,43 Mg m-3. La resistencia a la penetración fue significativamente mayor en las zonas 1 y 2, ambas zonas presentaron valores de resistencia a la penetración superiores a 1 MPa. La tasa de infiltración fue mucho mayor en el montículo (261 mm h-1 que en el resto de las zonas. La velocidad de infiltración de la zona 2 (85 mm h-1 fue mayor a la de la zona 1 (35 mm h-1 y el entremontículo (50 mm h-1. Los contenidos de carbono orgánico y nitrógeno de los suelos de las zonas 1 y 2 fueron similares a los del entremontículo y significativamente inferiores a los del montículo, excepto en la zona 2 de uno de los sitios ecológicos. La remoción de la vegetación y el suelo superficial, y el posterior tránsito de maquinaria pesada durante la instalación del gasoducto produjeron un fuerte impacto sobre las propiedades físicas del suelo. La mayor limitación de los suelos disturbados fue su baja capacidad para incorporar agua, derivada principalmente de su elevada compactación y baja porosidad, lo que explicaría en parte la lenta recuperación de la cobertura vegetal en la zona 1. En ninguno de los tres sitios estudiados, la reposición del material removido por la actividad del desmonte significó una medida de recuperación eficaz

Repercusión psicosocial del huracán Wilma en la comunidad del consejo popular Miramar, del municipio Playa Psychosocial repercussion caused by Wilma hurricane in the community of Miramar Popular Council of Playa municipality

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Isis Yvonne Sánchez Gil

2009-09-01

Full Text Available Se realizó un estudio descriptivo, observacional y retrospectivo, auxiliándonos de diversas técnicas cuanticualitativas (cuestionario y grupos focales con el propósito de describir las afectaciones más frecuentes sufridas por los vecinos del Consejo Popular Miramar, del municipio Playa, víctimas de la penetración del mar que provocó el huracán Wilma en esta localidad costera, e identificar las fortalezas y debilidades que exhibe esta comunidad para enfrentar las nefastas consecuencias derivadas de eventos de tal naturaleza. Predominaron las afectaciones de orden material, seguidas de los daños a la salud mental, entre los que se destacan: las crisis nerviosas o de ansiedad, el estado de ánimo abatido y los trastornos del sueño. Las fortalezas identificadas fueron la voluntad política del Estado y del Gobierno de la localidad, quienes garantizaron una eficaz estructura organizativa para el enfrentamiento de estas situaciones, la existencia de un mapa de riesgo en el municipio en el que se destacan las zonas más sensibles, la efectividad de los medios masivos de comunicación en la difusión de los partes meteorológicos seguidos por todo nuestro pueblo, y entre las amenazas más notorias, el mal estado de los desagües y de viviendas, así como la pobre percepción de riesgo de la población y la insuficiente preparación de vecinos y líderes comunitarios informales.Authors made a retrospective, observational and descriptive study using different quantitative and qualitative techniques (questionnaire and focal groups to describe the more frequent affectations suffered by neighbors of Miramar Popular Council of Playa municipality, victims of sea penetration caused by Vilma hurricane in this coastal locality, and to identify the strengths and weakness exhibiting this community to confront the awful consequences derived from events like this. There was a predominance of affectation of material order, followed by damages to mental

Tipos de tiempo para el turismo de sol y playa en el litoral alicantino

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Martínez Ibarra, Emilio

2008-06-01

Full Text Available In this article the author proposes a series of weather types, with the purpose of evaluating the climatic-tourist potencial for the tourism of sun and beach in the coast of Alicante. The method, analysis of the frequency of the density of use of the practice the suntan and swin, the type of consulted source (webcam images, as well as the diversity of distinguished types, make of this work a novel contribution, in a branch of the knowledge relatively little cultivated although emergent: the Tourist Climatology.

En el presente trabajo se proponen una serie de tipos de tiempo, con la finalidad de evaluar el potencial climático-turístico para el turismo de sol y playa en el litoral alicantino. El método, análisis de la frecuentación de la densidad de uso de la práctica del bronceado y baño, el medio a partir del cual se ha obtenido la información (imágenes webcam, así como la diversidad de tipos distinguidos, hacen de este trabajo una aportación novedosa, en una rama del conocimiento relativamente poco cultivada aunque emergente: la Climatología Turística.

Casa de campo en la playa de Jávea, Valencia – España

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De Jorge, M.

1971-03-01

Full Text Available This house is adapted to a gentle pine covered slope, extending down to the beach. There is a number of stepped down bedrooms, following the ground contour. The main bedroom is at the top, and it is on the same level as the dining and living room, the kitchen and other services, and two terraces facing north and south. At the lower part of the building there is a music and study room, with an independent entrance and a covered porch, for winter use. There is also a basement, firewood store room and other secondary rooms, which can allow for future extensions.El acoplamiento a una suave ladera cubierta de pinos, que desciende hacia la playa, determina una serie de dormitorios escalonados, según la pendiente del terreno, que culminan en la parte superior de la vivienda con el dormitorio principal, situado ya en el mismo plano que el salón-comedor, las terrazas principales N. y S. y la cocina y servicios anexos. En la parte inferior se sitúa un estudio-sala de música, con entrada independiente y un porche cubierto para invierno, junto con la bodega, leñera y otros servicios y espacios previstos para una posible ampliación.

Análisis de la diversidad biológica y mestizaje en la ciudad de Puerto Madryn (Prov. de Chubut, Argentina

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Parolín, María Laura

2013-12-01

Full Text Available En el marco del estudio de la composición genética de las poblaciones cosmopolitas de Argentina, se analizó una muestra poblacional de la localidad de Puerto Madryn (PM con la finalidad de evaluar su diversidad biológica mediante la utilización de marcadores biparentales y uniparentales y comparar los resultados con los obtenidos previamente por nuestro equipo de investigación en seis poblaciones cosmopolitas de distintas regiones de la Argentina, aunque poniendo el énfasis en las correspondientes a la Región Patagónica.Las muestras biológicas fueron tomadas con consentimiento informado a 82 dadores de sangre no emparentados que concurrieron al Banco de Sangre y al Hospital Subzonal de dicha localidad, a quienes también se les realizó una encuesta genealógica. A partir de los datos proporcionados por los marcadores autosómicos, se registró una contribución europea de 67.2%, amerindia de 29.4% y africana de 3.4%. A un origen amerindio fueron adscriptos el 59.9% y 8.7% de los linajes maternos y paternos, respectivamente, revelando un desigual aporte autóctono por género.El aporte europeo se vio representado principalmente por el Hg H (19.5% y se detectaron sólo dos linajes subsaharianos.En PM las migraciones desde el centro del país han generado un fuerte impacto, reflejado en la mayor contribución de marcadores europeos respecto de dos muestras estudiadas previamente en Chubut (Comodoro Rivadavia y Esquel. Estas diferencias al interior de una misma provincia nos advierten que no puede abordarse el análisis de la constitución genética de las poblaciones sin dar cuenta de las particularidades regionales.

Espectro trófico de peces concurrentes al área de crianza Playa Chipana (21°19'S - 70°04'W del norte de Chile

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Mauricio Vargas F.

1999-09-01

Full Text Available A total of 361 fishes including Odonthestes regia, Paralabrax humeralis, Isacia conceptionis, Cilus gilberti, Menticirrhus ophicephalus, Sciaena deliciosa and Scomber japonicus were collected in the nursery area Playa Chipana (21°19'S, northern Chile, from August 1989 through December 1990 in order determine their feeding habits. Both planctonic and benthonic preys were determined in the trophic spectrum for seven species, for which the main foods (MFI were crustaceans (zoea, miscidaceans, Emerita analoga, Ogyrides tarazonai and fishes (Engraulis ringens, Odonthestes regia, Normanichthys croockeri. Three trophic guilds were preliminarily identificated: 1.- carcinophagous fishes, 2.- ichthiophagous fishes, and 3.- planctophagous fishes.

Diversidad de bacterias cultivables con capacidad de degradar hidrocarburos de la playa de Caleta Córdova, Argentina

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Graciela N. Pucci

2011-05-01

Full Text Available En el presente trabajo se estudiaron las comunidades bacterianas aisladas de agua de mar y sedimentos intermareales de Caleta Córdova, norte de Comodoro Rivadavia, Argentina. Tres sitios fueron muestreados estacionalmente entre los años 2005 y 2006; el primer sitio fue una playa pública, el segundo sitio cerca de un puerto pesquero y el tercero cerca de una boya de toma de petróleo. Las comunidades bacterianas fueron determinadas en base a las diferencias en la composición de ácidos grasos de membrana, las bacterias fueron identificadas por medio del Sistema Sherlock MIDI, y el potencial de las comunidades para la utilización de hidrocarburos por la mineralización de gasoil, petróleo, kerosene, aceite lubricante y nafta. Las mineralizaciones evidenciaron la capacidad de los microorganismos para la degradación de hidrocarburos en dos de los sitios estudiados. Se aislaron 251 cepas de las que se lograron identificar 124 correspondientes a 24 géneros y 40 especies; la más frecuente fue Pseudoalteromonas.

Eolian deposition cycles since AD 500 in Playa San Bartolo lunette dune, Sonora, Mexico: Paleoclimatic implications

Science.gov (United States)

Ortega, Beatriz; Schaaf, Peter; Murray, Andrew; Caballero, Margarita; Lozano, Socorro; Ramirez, Angel

2013-12-01

Records of past climatic changes in desert environments are scarce due to the poor preservation of biological proxies. To overcome this lack we consider the paleoenvironmental significance and age of a lunette dune at the eastern rim of Playa San Bartolo (PSB) in the Sonoran Desert (Mexico). Thermoluminescence and optical stimulated luminescence (TL and OSL) provide the chronology of lunette dune development. Mineralogical, geochemical (major, trace and REE element concentrations) and rock magnetic analyses allow for the assessment of sediment provenance and changes in the composition of the PSB dune over time. The upper 6 m of dune accumulation occurred over the past 1.5 ka, largely during AD 500-1200, a period that correlates with the Medieval climatic anomaly (AD 300-1300). Variability in composition of dune sediments is attributed to changes in sediment sources. Sand sized deposits are mainly eroded from granitoids from nearby outcrops. Sandy silt deposits, rich in evaporative minerals, resulted after the flooding of PSB, later deflation and accumulation of both detritic and authigenic components in the dune. These findings suggest that main dune accretion occurred during regionally extended drought conditions, disrupted by sporadic heavy rainfall.

Gilberto Harris Bucher, Emigrantes e inmigrantes en Chile, 1810-1915. Nuevos aportes y notas revisionnistas, Valparaíso, Universidad de Playa Ancha Editorial, 2001.

OpenAIRE

Compagnon, Olivier

2005-01-01

Professeur d’histoire à l’Université des Sciences de l’Éducation de Playa Ancha (Valparaíso), auteur de nombreux travaux consacrés aux phénomènes d’émigration et d’immigration au Chili au XIXe siècle (Emigración y políticas gubernamentales de Chile durante el siglo XIX en 1996, Inmigración e emigración en Chile durante el siglo XIX. Estudios y documentos en 1997), l’auteur propose avec cet ouvrage une série d’études destinées à contrecarrer un certain nombre d’idées généralement admises à pro...

Acompañamiento para la permanencia en la educación superior de estudiantes de la universidad de playa ancha durante el 1er semestre de 2017

OpenAIRE

Aguilera, Juan Patricio; Vera, Montserrat Rodríguez; Salfate, Susana Parrao; Videla, Alesia Monteverde

2017-01-01

Tras la implementación del Programa de Acompañamiento y Acceso Efectivo a la Educación Superior en la Universidad de Playa Ancha de Valparaíso en Chile, ha quedado en evidencia la necesidad de fortalecer el acompañamiento a los estudiantes con el fin de evitar su deserción estudiantil, fenómeno que afecta a 3 de cada 10 estudiantes que ingresan a la educación superior (SIES, 2014). En este contexto, el objetivo del presente trabajo es presentar la propuesta de acompañamiento para la permanenc...

Sapling growth and crown expansion in canopy gaps of Nothofagus pumilio (lenga) forests in Chubut, Patagonia, Argentina

Energy Technology Data Exchange (ETDEWEB)

Lopez Bernal, P. M.; Defosse, G. E.; Quinteros, C. P.; Bava, J. O.

2012-07-01

In the province of Chubut in Patagonia, Argentina, Nothofagus pumilio forests (locally known as lenga), are managed through selective cuts, which imply the opening of canopy gaps. This management scheme is carried out without taking into consideration the changes of sapling requirements through either a cutting cycle or the precipitation gradient in which these forests thrive. To analyze these changes, we inferred the facilitation-competition balance between the canopy and regeneration, studying the effects of precipitation levels, gap size and gap age on saplings growth in height on 45 canopy gaps artificially created between 1960 and 1993. Results showed that during the first 20 years since gap opening, growth of regeneration is determined by light availability in mesic sites and by water availability in xeric sites. However, differences due to precipitation levels gradually decrease over time. Moreover, in the period between 20 and 35 years after gap opening, in both mesic and xeric sites, growth is limited by light availability. This indicates that in xeric sites, sapling growth requirements shift from a water-dependent situation to a light-dependent situation. The average closing rate of gaps due to lateral growth of bordering trees is high enough so that within the proposed gap size range, gap healing can occur before regeneration reaches the upper stratum. Consequently, in mesic sites gap opening can be done by a single operation that generates gaps with diameters of approximately twice the average height of the canopy (D/H). While in xeric environments, lenga seedling establishment and initial growth require the cover of small gaps, but advanced regeneration requires bigger gaps to reach the canopy. For this reason, gaps should be opened in two stages: the first gaps should be opened with a D/H between 0.8 and 1, and after a cutting cycle of 35 years, these openings should be enlarged to a D/H between 1.5 and 2. The close relationship maintained between the

Effects of sediment removal on vegetation communities in Rainwater Basin playa wetlands.

Science.gov (United States)

Beas, Benjamin J; Smith, Loren M; LaGrange, Theodore G; Stutheit, Randy

2013-10-15

Sedimentation from cultivated agricultural land use has altered the natural hydrologic regimes of depressional wetlands in the Great Plains. These alterations can negatively affect native wetland plant communities. Our objective was to determine if restored wetlands are developing plant communities similar to reference wetland conditions following hydrologic restoration. For this study, hydrology was restored via sediment removal. Thirty-four playa wetlands in reference, restored, and agricultural condition within the Rainwater Basin Region of Nebraska were sampled in 2008 and 2009. In 2008, reference and restored wetlands had higher species richness and more native, annual, and perennial species than agricultural wetlands. Restored wetlands had similar exotic species richness compared to reference and agricultural wetlands; however, reference wetlands contained more than agricultural wetlands. Restored wetlands proportion of exotics was 3.5 and 2 times less than agricultural wetlands and reference wetlands respectively. In 2009, reference and restored wetlands had higher species richness, more perennial species, and more native species than agricultural wetlands. Restored wetlands contained a greater number and proportion of annuals than reference and agricultural wetlands. Canonical Correspondence Analysis showed that reference, restored, and agricultural wetlands are dominated by different plant species and guilds. Restored wetland plant communities do not appear to be acting as intermediates between reference and agricultural wetland conditions or on a trajectory to reach reference conditions. This may be attributed to differing seed bank communities between reference and restored wetlands, dispersal limitations of perennial plant guilds associated with reference wetland conditions, and/or management activities may be preventing restored wetlands from reaching reference status. Copyright © 2013 Elsevier Ltd. All rights reserved.

Distribución espacial de Ocypode quadrata (Decapoda: Ocypodidae en ocho playas de la zona norte oriental de Cuba

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Frank A. Ocaña

2012-09-01

Full Text Available Uno de los organismos más comunes en las playas arenosas son los miembros del género Ocypode conocidos como cangrejos fantasmas, están ampliamente distribuidos en las regiones tropicales y subtropicales; además tienen un importante papel en la transferencia de energía en diferentes niveles tróficos. El objetivo del presente trabajo es dar a conocer aspectos relacionados con la variación espacial de la densidad de O. quadrata en playas con diferente nivel de influencia humana en la costa norte oriental de Cuba. En mayo de 2010, fueron contadas un total de 355 galerías en 360 unidades de muestreo. La composición por clases de tallas fue de 237 galerías de jóvenes y 118 de adultos. Del total de galerías contadas el 74% ocuparon el nivel P1, 20% el nivel P2 y 6% el nivel P3. La densidad varió entre 0.06-0.52galerías/m2. A pesar del nivel de influencia humana, la mayoría de las playas no mostró diferencias significativas en la densidad de galerías (Scheffé, p>0.05. La densidad de individuos en la zona superior de resaca del oleaje es mayor (Scheffé, pSpatial distribution of Ocypode quadrata (Decapoda: Ocypodidae in eight beaches of NorthEastern Cuba. Studies on the ecology of Ocypode quadrata have been mostly carried out in the Northern and Southern part of its distribution range. In despite that this species is common in Cuban beaches, there are no quantitative studies regarding its abundance and spatial distribution. The aim of this study was to report some aspects about the spatial variation of O. quadrata density in sandy beaches, with different levels of human influence, in the North coast of Eastern Cuba. For this, on May 2010, eight beaches with different levels of human influence were surveyed. On each beach, the number of crabs burrows were counted in 45 quadrats of 4m2 located in three different strata (P1, P2 and P3. According to burrow opening diameter, crabs were separated into young and adults forms. To determine the

First Observation of Rock Motion on Racetrack Playa, Death Valley National Park—Role of a Persistent Pool, Sun, Zephyrs, Windowpane Ice, and Tugboats

Science.gov (United States)

Norris, R. D.; Norris, J. M.

2014-12-01

Trails in the mud-cracked surface of Racetrack Playa have been scored by hundreds of rocks up to 320 kg, but the mechanism of movement is debated. In Winter 2013-2014, we observed rocks in motion associated with a transient pool formed by winter precipitation. The pond was 7 cm deep on the southern edge of the playa, tapering to a mud flat to the north. Freezing during cold winter nights formed floating "windowpane" ice 3-5 mm thick. Rocks repeatedly moved on sunny days under light winds of 3-5 m/second, as the ice broke up near midday and was set into motion by wind stress on melt pools and the ice surface. Ice panels shoved rocks along the mud like a tugboat, sometimes forming moving imbricated ice piles upstream of the rocks and in other cases moving faster than the rocks and forming brash-filled leads downstream. GPS units mounted in experimental rocks recorded a creeping pace of 2-6 m/minute, a speed that made it difficult to observe trail formation visually. The 2013-2014 pond formed on November 20-24 and persisted through early February 2014. During this time rocks were observed moving at least five times, and studies of "stiz marks" formed by rocks at the ends of trail segments show that there were likely 3-5 additional move events. Observed travel times ranged from a few seconds to 16 minutes. In one event, two experimental rocks 153 m apart began moving simultaneously and traveled 64.1 and 65.6 m respectively, ultimately moving 157-162 m in subsequent events. Rock motion depends on the creation of winter pools sufficiently deep to allow the formation of floating ice and exposed to the light winds and sun needed for ice breakup. The combination of these events is extremely rare, leading to highly episodic trail formation. Our observations differ from previous hypotheses in that the rocks were moved by thinner ice, at slower speeds, and by lighter winds than predicted.

Incidence of variables in the Transfer of Tacit Knowledge of Marketing in the hotel sector of Playa del Carmen city, Mexico.

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José Luis Zapata

2017-01-01

Full Text Available Esta investigación permitió validar un modelo de influencia de la intención de aprendizaje de market‑ ing, motivación personal y capacidad de absorción de conocimiento de marketing en la adquisición de conocimien‑ to tácito de marketing y esto a su vez en la transferencia de conocimiento tácito de marketing entre los empleados de pequeñas y medianas empresas hoteleras en la ciudad de Playa del Carmen, Quintana Roo, México. A través de una investigación cuantitativa y transversal, se integraron 229 empleados del sector hotelero. Los resultados mostraron que la motivación personal y la intención de aprender marketing intervienen positivamente en la adquisición de conocimiento tácito de marketing y, con influencia de la capacidad de absorción del conocimiento de marketing, impactan directamente la transferencia de conocimiento tácito de marketing.

La cartografía bibliográfica y la memoria emblemática Playa Ancha, Valparaíso

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Marjorie Andrea Mardones Leiva

2016-12-01

Full Text Available Este estudio propone un análisis para el estudio de la memoria emblemática del territorio de Playa Ancha, Valparaíso, basándose en una revisión bibliográfica situada. Su objetivo principal es reconocer los discursos que han colaborado en la construcción, articulación y cristalización del imaginario social de la localidad a partir de su producción bibliográfica: temáticas recurrentes, agentes discursivos oficiales y disidentes, prácticas sociales, entre otros. Esta investigación pone en crisis la tendencia de los estudios bibliométricos actuales que se han dedicado principalmente al análisis de información para entidades educacionales o de producción científica nacional, dejando atrás aspectos tan importantes como es el espacio, tiempo, lugar (Sousa-Santos, 1991 y su relación con el día a día del ciudadano. Para representar los resultados del estudio, se han utilizado gráficos y cartografías, destacando la relación entre territorio y bibliografía.

Ecosystem effects from produced water and potash mine disposal activities

International Nuclear Information System (INIS)

Roy, R.; Davis, D.; Hopkins, S.

1993-01-01

This study was initiated to determine the chemical, physical, and ecosystem effects of produced water and potash mine disposal practices upon naturally occurring-hypersaline playas in southeast New Mexico, Several playas that receive discharges were compared to several nearby reference playas. Results revealed that the treatment playas had been significantly altered when compared to the reference playas. For example, the salinity of treatment playas were greater than 300 per-thousand and those of reference playas were less than 200 per-thousand. The dominant ions in water and sediments of treatment playas were sodium and chloride. The major ions in reference playa water and sediments were sodium, calcium, chloride, and sulfate. In some instances aromatic hydrocarbon concentrations exceeded 13,000 ng/g in sediments from treatment playas. Aromatic hydrocarbon concentrations were less than 100 ng/g in sediments from reference playas. Surveys revealed that treatment playas supported few, if any, invertebrates. On the other hand, reference playas supported dense populations of brine shrimp Artemis and brine fly Hydropyrus larvae. Surveys also indicated that reference playas were used by shorebirds for nesting and feeding, whereas treatment playas were used as loafing areas by waterfowl. Unfortunately, dead waterfowl were found along the shores of several treatment playas. Necropsies revealed that the most likely cause of death was salt toxicosis

Assessment of Sampling Approaches for Remote Sensing Image Classification in the Iranian Playa Margins

Science.gov (United States)

Kazem Alavipanah, Seyed

There are some problems in soil salinity studies based upon remotely sensed data: 1-spectral world is full of ambiguity and therefore soil reflectance can not be attributed to a single soil property such as salinity, 2) soil surface conditions as a function of time and space is a complex phenomena, 3) vegetation with a dynamic biological nature may create some problems in the study of soil salinity. Due to these problems the first question which may arise is how to overcome or minimise these problems. In this study we hypothesised that different sources of data, well established sampling plan and optimum approach could be useful. In order to choose representative training sites in the Iranian playa margins, to define the spectral and informational classes and to overcome some problems encountered in the variation within the field, the following attempts were made: 1) Principal Component Analysis (PCA) in order: a) to determine the most important variables, b) to understand the Landsat satellite images and the most informative components, 2) the photomorphic unit (PMU) consideration and interpretation; 3) study of salt accumulation and salt distribution in the soil profile, 4) use of several forms of field data, such as geologic, geomorphologic and soil information; 6) confirmation of field data and land cover types with farmers and the members of the team. The results led us to find at suitable approaches with a high and acceptable image classification accuracy and image interpretation. KEY WORDS; Photo Morphic Unit, Pprincipal Ccomponent Analysis, Soil Salinity, Field Work, Remote Sensing

Physical, chemical, and mineralogical data from surficial deposits, groundwater levels, and water composition in the area of Franklin Lake playa and Ash Meadows, California and Nevada

Science.gov (United States)

Goldstein, Harland L.; Breit, George N.; Yount, James C.; Reynolds, Richard L.; Reheis, Marith C.; Skipp, Gary L.; Fisher, Eric M.; Lamothe, Paul J.

2011-01-01

This report presents data and describes the methods used to determine the physical attributes, as well as the chemical and mineralogical composition of surficial deposits; groundwater levels; and water composition in the area of Franklin Lake playa and Ash Meadows, California and Nevada. The results support studies that examine (1) the interaction between groundwater and the ground surface, and the transport of solutes through the unsaturated zone; (2) the potential for the accumulation of metals and metalloids in surface crusts; (3) emission of dust from metal-rich salt crust; and (4) the effects of metal-rich dusts on human and ecosystem health. The evaporation of shallow (travel as atmospheric dust and affect human and ecosystem health at local to regional scales.

Estudio transversal de las parasitosis intestinales en poblaciones infantiles de Argentina

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Graciela Teresa Navone

2017-06-01

Full Text Available RESUMEN Objetivo Determinar la distribución de las enteroparasitosis en niños de nueve provincias representativas del mosaico de ambientes contrastantes de Argentina. Métodos Estudio descriptivo, observacional y transversal en niños preescolares (de 5 años o menos y escolares (de 6 a 14 años de las provincias de Buenos Aires (muestra tomada entre 2005 y 2013, Chubut (2010-2013, Corrientes (2012, Entre Ríos (2010-2012, Formosa (2014, La Pampa (2006, Mendoza (2008-2011, Misiones (2005-2008 y 2013 y Salta (2012-2013. Se procesaron muestras seriadas, fecales y de escobillado anal, mediante técnicas de concentración. Los resultados se analizaron por sexo, intervalo de edad y provincia. Se calcularon la frecuencia de parasitosis (monoparasitosis y parasitosis múltiple, la riqueza de especies y el coeficiente de similitud de Sørensen. Resultados Misiones presentó la mayor frecuencia de niños parasitados y Chubut la menor (82,0% vs. 38,4%; p ˂ 0,01. El número de especies fue mayor en Misiones y Buenos Aires y menor en Chubut y La Pampa. Los varones estuvieron más parasitados que las mujeres solo en Buenos Aires. Las mayores frecuencias se encontraron en los preescolares de Buenos Aires y los escolares de Mendoza y Misiones (p < 0,05. La monoparasitosis fue más frecuente en Chubut (67,9% y las parasitosis múltiples en Formosa (69,2%. Las especies más frecuentes en la mayoría de las provincias fueron Blastocystis sp. y Enterobius vermicularis. De los geohelmintos, Misiones presentó la mayor frecuencia (23,3% y Mendoza la menor (0,6%; no se hallaron en Chubut, La Pampa y Salta. Buenos Aires, Formosa y Misiones presentaron una composición de especies similar, al igual que Chubut y La Pampa. Conclusiones Las frecuencias de parasitosis en Argentina responden al complejo mosaico de variabilidad climática y socioeconómica del país y revelan una tendencia descendente de norte a sur y de este a oeste.

Exploration, antifungal and antiaflatoxigenic activity of halophilic bacteria communities from saline soils of Howze-Soltan playa in Iran.

Science.gov (United States)

Jafari, Samaneh; Aghaei, Seyed-Soheil; Afifi-Sabet, Hossein; Shams-Ghahfarokhi, Masoomeh; Jahanshiri, Zahra; Gholami-Shabani, Mohammadhassan; Shafiei-Darabi, Seyedahmad; Razzaghi-Abyaneh, Mehdi

2018-01-01

In the present study, halophilic bacteria communities were explored in saline soils of Howze-Soltan playa in Iran with special attention to their biological activity against an aflatoxigenic Aspergillus parasiticus NRRL 2999. Halophilic bacteria were isolated from a total of 20 saline soils using specific culture media and identified by 16S rRNA sequencing in neighbor-joining tree analysis. Antifungal and antiaflatoxigenic activities of the bacteria were screened by a nor-mutant A. parasiticus NRRL 2999 using visual agar plate assay and confirmed by high-performance liquid chromatography. Among a total of 177 halophilic bacteria belonging to 11 genera, 121 isolates (68.3%) inhibited A. parasiticus growth and/or aflatoxin production. The most potent inhibitory bacteria of the genera Bacillus, Paenibacillus and Staphylococcus were distributed in three main phylogenetic clusters as evidenced by 16S rRNA sequence analysis. A. parasiticus growth was inhibited by 0.7-92.7%, while AFB 1 and AFG 1 productions were suppressed by 15.1-98.9 and 57.0-99.6%, respectively. Taken together, halophilic bacteria identified in this study may be considered as potential sources of novel bioactive metabolites as well as promising candidates to develop new biocontrol agents for managing toxigenic fungi growth and subsequent aflatoxin contamination of food and feed in practice.

Investigation into avian mortality in the Playa Lakes region of southeastern New Mexico: Final Report - June 1997

Science.gov (United States)

Dein, F. Joshua; Baeten, Laurie A.; Moore, Melody K.; Samuel, Michael D.; Miller, Paul D.; Murphy, Christopher; Sissler, Steven; Jeske, Clinton W.; Jehl, Joseph R.; Yaeger, J. S.; Bauer, B.; Mahoney, Shiela A.

1997-01-01

This Final Report is a review of work on a cooperative study undertaken by the USGS Biological Resources Division's National Wildlife Health Center (NWHC) and National Wetlands Research Center (NWRC; formerly the Southern Science Center) from 1994 through 1997. The study was initiated at the request of the Bureau of Land Management (BLM), through a request to the former National Biological Service. The Southeastern New Mexico Playa Lakes Coordinating Committee (SENMPLCC) played an important role in outlining the research needs. The initial Study Plan document, which outlines the background, objectives and methods for the first two years is available as Appendix 1. A letter indicating modifications to the Study Plan was sent to the SENMPLCC chair on April 25,1995, and is Appendix 2. An Interim Report, covering this work was completed and submitted in September 1995. The Literature Review section of the study was completed and presented to SENMPLCC in August, 1995. Following SENMPLCC review, NWHC was asked to develop a series of questions that could be posed from information gained in the initial phase (Appendix 3). The NWHC and NWRC were then directed to begin work to answer the top three questions, within the available fiscal resources. NWRC could continue with work outlined under the original Study Plan (Appendix 1), however an additional Study Plan for experiments performed by NWHC and collaborators and is available as Appendix 4.

[Cross-sectional study of intestinal parasitosis in child populations in Argentina].

Science.gov (United States)

Navone, Graciela Teresa; Zonta, María Lorena; Cociancic, Paola; Garraza, Mariela; Gamboa, María Inés; Giambelluca, Luis Alberto; Dahinten, Silvia; Oyhenart, Evelia Edith

2017-06-08

Determine the distribution of intestinal parasitosis in children in nine provinces representative of Argentina's mosaic of contrasting environments. Descriptive, observational, cross-sectional study of preschool children (5 years old or under) and school-age children (6-14 years) in the provinces of Buenos Aires (sample taken between 2005 and 2013), Chubut (2010-2013), Corrientes (2012), Entre Ríos (2010-2012), Formosa (2014), La Pampa (2006), Mendoza (2008-2011), Misiones (2005-2008 and 2013), and Salta (2012-2013). Serial samples, fecal samples, and anal swabs were processed using concentration techniques. The results were analyzed by sex, age interval, and province. Frequency of parasitosis (monoparasitosis and multiple parasitoses), wealth of species, and Sørensen similarity coefficient were calculated. Misiones presented the highest frequency of parasitized children and Chubut the lowest (82.0% vs 38.4%; p parasitosis in Formosa (69.2%). The most frequent species in the majority of provinces were Blastocystis sp. and Enterobius vermicularis. Misiones presented the highest frequency of soil-transmitted helminthes (23.3%) and Mendoza the lowest (0.6%); none were found in Chubut, La Pampa, or Salta. Buenos Aires, Formosa, and Misiones presented a similar species composition, as did Chubut and La Pampa. The frequency of parasitosis in Argentina corresponds to the country's complex mosaic of climatic and socioeconomic variability and shows a declining trend from north to south and from east to west.

Desarrollo metodológico para la caracterización morfodinámica de playas mediante el empleo de técnicas eléctricas : aplicación en la Rías Baixas gallegas

OpenAIRE

Martínez Gómez, Ángela

2014-01-01

Las playas son ambientes de alto valor ambiental sin olvidar que una de sus funciones, es la protección de la costa frente a fenómenos costeros y que cada vez son más frecuentes e intensos. Son ambientes complejos debido a los grandes cambios morfodinámicos que ocurren en ellos, y el desarrollo de nuevas metodologías para su estudio es de gran interés a nivel mundial. Nuestra primera aportación, consistió en analizar el grado de modificación de las Rías Baixas gallegas identifi...

Beach erosion and nest site selection by the leatherback sea turtle Dermochelys coriacea (Testudines: Dermochelyidae and implications for management practices at Playa Gandoca, Costa Rica

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Matthew J Spanier

2010-12-01

Full Text Available Leatherback sea turtles (Dermochelys coriacea nest on dynamic, erosion-prone beaches. Erosive processes and resulting nest loss have long been presumed to be a hindrance to clutch survival. In order to better understand how leatherbacks cope with unstable nesting beaches, I investigated the role of beach erosion in leatherback nest site selection at Playa Gandoca, Costa Rica. I also examined the potential effect of nest relocation, a conservation strategy in place at Playa Gandoca to prevent nest loss to erosion, on the temperature of incubating clutches. I monitored changes in beach structure as a result of erosion at natural nest sites during the time the nest was laid, as well as in subsequent weeks. To investigate slope as a cue for nest site selection, I measured the slope of the beach where turtles ascended from the sea to nest, as well as the slopes at other random locations on the beach for comparison. I examined temperature differences between natural and relocated nest sites with thermocouples placed in the sand at depths typical of leatherback nests. Nests were distributed non-randomly in a clumped distribution along the length of the beach and laid at locations that were not undergoing erosion. The slope at nest sites was significantly different than at randomly chosen locations on the beach. The sand temperature at nest depths was significantly warmer at natural nest sites than at locations of relocated nests. The findings of this study suggest leatherbacks actively select nest sites that are not undergoing erosive processes, with slope potentially being used as a cue for site selection. The relocation of nests appears to be inadvertently cooling the nest environment. Due to the fact that leatherback clutches undergo temperaturedependent sex determination, the relocation of nests may be producing an unnatural male biasing of hatchlings. The results of this study suggest that the necessity of relocation practices, largely in place to

Technical procedures for water resources, Deaf Smith County site, Texas: Volume 2: Environmental Field Program: Final draft

International Nuclear Information System (INIS)

1987-08-01

This volume contains the following Technical Procedures pursuant to the Water Resources Site Study Plan operation of a Playa Lake conductivity monitoring station and processing of data from a Playa Lake conductivity monitoring station. This procedure defines steps and methods for the installation, operation, and maintenance of the Playa Lake conductivity monitoring stations. Conductivity measurements will be taken at six playa lakes in the site study area to record changes in total dissolved solids as a function of stage. Playa lake conductivity and stage (volume) measurements will be used, in conjunction with other water quality data collected at the Playa Lake and precipitation stations, to determine the mass of dissolved solids entering and leaving the playas. This baseline information on the pollutant mass balance of the playas will be used to assess potential changes in playa lake water quality and the magnitude of those changes due to site development. The pollutant mass balances will also be used on determining the source of pollutants. 2 refs., 5 figs

Bacterial and Archaeal Lipids Recovered from Subsurface Evaporites of Dalangtan Playa on the Tibetan Plateau and Their Astrobiological Implications

Science.gov (United States)

Cheng, Ziye; Xiao, Long; Wang, Hongmei; Yang, Huan; Li, Jingjing; Huang, Ting; Xu, Yi; Ma, Nina

2017-11-01

Qaidam Basin (Tibetan Plateau) is considered an applicable analogue to Mars with regard to sustained extreme aridity and abundant evaporites. To investigate the possibility of the preservation of microbial lipids under these Mars analog conditions, we conducted a mineralogical and organic geochemistry study on samples collected from two Quaternary sections in Dalangtan Playa, northwestern Qaidam Basin, which will enhance our understanding of the potential preservation of molecular biomarkers on Mars. Two sedimentary units were identified along two profiles: one salt unit characterized by a predominance of gypsum and halite, and one detrital unit with a decrease of gypsum and halite and enrichment in siliciclastic minerals. Bacterial fatty acids and archaeal acyclic diether and tetraether membrane lipids were detected, and they varied throughout the sections in concentration and abundance. Bacterial and archaeal biomolecules indicate a dominance of Gram-positive bacteria and halophilic archaea in this hypersaline ecosystem that is similar to those in other hypersaline environments. Furthermore, the abundance of bacterial lipids decreases with the increase of salinity, whereas archaeal lipids showed a reverse trend. The detection of microbial lipids in hypersaline environments would indicate, for example on Mars, a high potential for the detection of microbial biomarkers in evaporites over geological timescales.

Conflicting evolutionary patterns due to mitochondrial introgression and multilocus phylogeography of the Patagonian freshwater crab Aegla neuquensis.

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Brian R Barber

Full Text Available BACKGROUND: Multiple loci and population genetic methods were employed to study the phylogeographic history of the Patagonian freshwater crab Aegla neuquensis (Aeglidae: Decopoda. This taxon occurs in two large river systems in the Patagonian Steppe, from the foothills of the Andes Mountains east to the Atlantic Ocean. METHODOLOGY/PRINCIPAL FINDINGS: A nuclear phylogeny and multilocus nested clade phylogeographic analysis detected a fragmentation event between the Negro and Chico-Chubut river systems. This event occurred approximately 137 thousand years ago. An isolation-with-migration analysis and maximum-likelihood estimates of gene flow showed asymmetrical exchange of genetic material between these two river systems exclusively in their headwaters. We used information theory to determine the best-fit demographic history between these two river systems under an isolation-with-migration model. The best-fit model suggests that the Negro and the ancestral populations have the same effective population sizes; whereas the Chico-Chubut population is smaller and shows that gene flow from the Chico-Chubut into the Negro is four times higher than in the reverse direction. Much of the Chico-Chubut system appears to have only been recently colonized while the Negro populations appear to have been in place for most of the evolutionary history of this taxon. CONCLUSIONS/SIGNIFICANCE: Due to mitochondrial introgression, three nuclear loci provided different phylogeographic resolution than the three mitochondrial genes for an ancient fragmentation event observed in the nuclear phylogeny. However, the mitochondrial locus provided greater resolution on more recent evolutionary events. Our study, therefore, demonstrates the need to include both nuclear and mitochondrial loci for a more complete understanding of evolutionary histories and associated phylogeographic events. Our results suggest that gene flow between these systems, before and after fragmentation

La dispensarización en el policlínico universitario docente de Playa un año después de la reorganización Dispensarization in the "Playa" teaching and university polyclinic after one year of the reorganization

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Leonardo Antonio Cuesta Mejías

2011-03-01

Full Text Available Introducción: aunque concebida originalmente en la antigua Unión Soviética, la dispensarización en nuestro país se llegó a constituir, junto con el Análisis de la Situación de Salud, en elementos fundamentales de la medicina familiar, en otras palabras, en la organización del trabajo del Médico de Familia. Objetivos: determinar la situación de la dispensarización a un año de haberse implementado la reorganización de nuestros consultorios de medicina familiar. Métodos: se desarrolló un estudio descriptivo de corte transversal de una muestra tomada al azar, 400 de las historias clínicas individuales del total de pacientes dispensarizados con enfermedades crónicas no transmisibles en los 9 consultorios del Médico y Enfermera de Familia del Policlínico Universitario Docente de Playa. Se revisaron igualmente las historias de salud familiar de los pacientes cuyas historias individuales seleccionamos. Se obtuvo también información de los registros del Departamento de Estadísticas del propio policlínico, con relación a la actividad realizada por los equipos básicos de salud en consulta y en terreno en el mes de enero del presente año. Resultados: la mayoría de los pacientes pertenecen a los grupos de edades por encima de los 50 años, igualmente al sexo femenino y sufren de una sola enfermedad crónica. La hipertensión arterial es la enfermedad crónica que más los afecta, seguida de la diabetes mellitus. El 40 % de los pacientes no ha recibido control, y el 81 % de los pacientes ha sido consultado, ambas situaciones en el último año. Conclusiones: la dispensarización ha mejorado, pero se mantiene presentando un grupo importante de insuficiencias. La reorganización ofrece un potencial aún sin explotar para garantizar una mejor e integral atención médica a nuestra población.Introduction: although originally conceived in the former Soviet Union, the dispensarization in our country was implemented together with the

Braidplain, floodplain and playa lake, alluvial-fan, aeolian and palaeosol facies composing a diversified lithogenetical sequence in the permian and triassic of South Devon (England)

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Mader, Detlef

The Permian and Triassic of South Devon (England) are a continental red bed sequence of very diversified lithogenetical composition. Within the thick series, the distribution of the main depositional environments being fluvial braidplain, fluvial floodplain and playa lake, alluvial fan, aeolian dune and calcrete palaeosol changes repeatedly in both horizontal and vertical direction. Significant sedimentary milieus such as aeolian dunes and calcrete palaeosols occur repeatedly within the succession, but are also lacking in several parts of the sequence. Fluvial braidplain deposits comprise conglomerates, sandstones, intraformational reworking horizons and mudstones and originate in channels and overbank plains of a braided river system. Conglomerates and sandstones are formed by migration of bars and spreading out of sheets during infilling of streams and aggradation of flats. Gravel is often enriched as lag pockets or veneers within steeper scour holes and kolk pots or on the plane floor of the watercourse. Finer-grained sandstones and mudstones are laid down by suspension settling in stagnant water bodies such as small lakes in the overbank area and residual pools in interbar depressions during low-stage or waning-flow in active channels or in abandoned streams. Spectacular bioturbation features in some sandstones with both horizontal tubes and vertical burrows testify to the colonization of the sediments at the bottom of the rivers with declining discharge and transport capacity. Intraformational reworking horizons with ghost-like remnants of degraded sandstones, mudstones and pedogenic carbonates document partially severe condensation of the sequence by removal of some facies elements from the depositional record. The occasionally occurring gravel-bearing mudstones or silty-clayey sandstones represent products of high-energy water surges overspilling the channel banks and transporting sandy and gravelly bed-load in limited amounts beyond the levee wall. The

Avian cholera in waterfowl: the role of lesser snow and Ross's geese as carriers of avian cholera in the Playa Lakes region

Science.gov (United States)

Samuel, M.D.; Shadduck, D.J.; Goldberg, Diana R.; Johnson, W.P.

2005-01-01

We collected samples from apparently healthy geese in the Playa Lakes Region (USA) during the winters of 2000a??01 and 2001a??02 to determine whether carriers of Pasteurella multocida, the bacterium that causes avian cholera, were present in wild populations. With the use of methods developed in laboratory challenge trials (Samuel et al., 2003a) and a serotype-specific polymerase chain reaction method for identification of P. multocida serotype 1, we found that a small proportion of 322 wild birds (cholera infection. Our results confirm the hypothesis that wild waterfowl are carriers of avian cholera and add support for the hypothesis that wild birds are a reservoir for this disease. In concert with other research, this work indicates that enzootic infection with avian cholera occurs in lesser snow goose (Chen caerulescens caerulescens) populations throughout their annual cycle. Although fewer Rossa??s geese (Chen rossii) were sampled, we also found these birds were carriers of P. multocida. Even in the absence of disease outbreaks, serologic evidence indicates that chronic disease transmission and recent infection are apparently occurring year-round in these highly gregarious birds and that a small portion of these populations are potential carriers with active infection.

Use RUSLE2 model to assess the impact of soil erosion on playa inundation and hydrophyte conditions in the Rainwater Basin, Nebraska.

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Tang, Zhenghong; Gu, Yue; Jiang, Weiguo; Xue, Yuan; Bishop, Andy; LaGrange, Ted; Nugent, Eleanor

2016-06-01

Playas in the Rainwater Basin region in Nebraska are globally important wetlands that are continuously threatened by culturally accelerated sedimentation. Using annual habitat survey data and wetland vegetation inventories, inundation and hydrophyte community distributions were evaluated for properties under different types of conservation status. Annual soil erosion rates from surrounding watersheds were calculated to estimate sediment accumulated rates using the Revised Universal Soil Loss Equation 2 (RUSLE2). The slope-length component of the RUSLE2 was derived from 2009 light detection and ranging (LiDAR) data after the methods described by Van Remortel (Computers & Geosciences 30:1043-1053, 2004). Wetlands enrolled in conservation programs were inundated more and were dominated to a greater degree by hydrophytes than wetlands not enrolled in these programs. The mean estimated soil erosion rate at the Rainwater Basin landscape level was 4.67 tons/ha/year, and the mean estimated sediment accumulation depth for public watersheds was estimated as 0.19 cm/year. Without appropriate conservation actions, the current inundated acres and wetland acres growing hydrophytes would be further reduced by sediment accumulation. The results illustrated the importance of conservation programs to protect wetlands.

The uranium potential of the continental Cretaceous of Patagonia

International Nuclear Information System (INIS)

Olsen, H.; Berizzo, J.

1980-01-01

The geological features of the fluvial sedimentation of the Cretaceous of Patagonia - the Grupo Chubut Formation in the provinces of Chubut and Santa Cruz, underlined this environment as one of high favourability for discovering uranium deposits. The area has been explored by the CNEA who found two outstanding levels of fluvial sediments that are today the target of further studies to find new deposits. The general geological features are given, together with the results of the exploration up to date, distribution of radiometric anomalies, deposits discovered and an estimation of the uraniferous potential of the Formation. (author)

Orbital rhythms, monsoons, and playa lake response, Olduvai basin, Equatorial East Africa at 1.85-1.75 Ma

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Ashley, G. M.

2001-12-01

Wet-dry cycles in low latitudes are generally attributed to changes in solar radiation related to the 21 kyr tempo of orbital precession. Stronger insolation drives stronger summer monsoon maxima that increase precipitation and in closed basins produce larger lakes. However, a Plio-Pleistocene record from a closed rift-platform basin near the equator suggests that the obliquity (41 kyr) signal is also present. The 1.85-1.75 Ma sedimentary record deposited in the Olduvai basin, 3oN, reveals clear evidence of periodic expansion and contraction of paleolake Olduvai. The closed basin was 50 km wide and infilled by volcaniclastic material from Ngorongoro volcanic complex in several depositional environments.. A saline-alkaline lake expanded up to 15 km in width and deposited Mg-smectitic claystones. The lake clays in the central basin vary in clay mineralogy and the number of calcite crystal horizons reflecting compositional changes in the lake water. Lake expansions are recorded at the margins where lake clays are intercollated with deltaic and ephemeral fluvial sands and with lake margin wetland deposits. Marine dust records, off both west and east Africa, suggest that the precession signal (21kyr) dominated the climate until 2.8 Ma and the obliquity signal (41kyr) from 2.8 to 0.9 Ma (deMenocal, 1995). In contrast, the stratigraphic sequence for playa lake expansion at Olduvai, that is constrained by the tephra chronology (1.85-1.75 Ma) and paleomagnetic record, documents the combined effects of both obliquity and precession cycles.

COMPETITIVIDAD Y CALIDAD EN LOS DESTINOS TURÍSTICOS DE SOL Y PLAYA. EL CASO DE LAS ISLAS CANARIAS

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J. Rosa Marrero Rodríguez

2008-01-01

Full Text Available El objeto del artículo es conocer y comparar el nivel de competitividad que presentan las cuatro islas turísticas canarias más importantes, a través de la combinación de diferentes variables de aproximación al mismo. Todo ello se plantea en el contexto más general de discusión de los mecanismos de reconversión y reposicionamiento en los destinos tradicionales de sol y playa a través de la implementación de elementos de calidad en el negocio turístico. Para acercarnos a la medición de la competitividad se ha usado una metodología doble: a través de las estadísticas del gasto turístico, los niveles de ocupación y la evolución del número de plazas y de turistas. Y también a través de un pequeño estudio de casos en Internet, donde se han analizado los precios para dos paquetes turísticos característicos. Los resultados coinciden en indicar que, a pesar de la estrategia de calidad adoptada por Lanzarote, esto no parece traducirse en una mayor rentabilidad económica para el sector. En definitiva, a pesar de la proclamada importancia de la calidad como factor clave de competitividad, no está claro que el mercado esté dispuesto a recompensar a aquellos destinos que apuestan con precios mayores por la calidad.

La materia orgánica particulada: comparación de métodos para su determinación y su valor como indicador de calidad de suelos del Chubut Particulate organic-matter: a comparison of methods for its determination and its role as an indicator of soil quality for some soils in the province of Chubut

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Lina Sonia Videla

2008-12-01

Full Text Available La materia orgánica particulada (MOP es un componente dinámico del suelo, que responde selectiva y rápidamente a los cambios de manejo y distintos tipos de disturbios. El objetivo de este estudio fue comparar dos técnicas de determinación de MOP en distintos suelos y evaluar el potencial de esta variable como indicadora de calidad de los mismos. Se estudiaron tres sitios ecológicos de la provincia del Chubut con distinto manejo o afectados por distintos disturbios: Media Luna Clausura (ML C, Media Luna Pastoreo (ML P, Puerto Madryn bioperturbado (PM B, Puerto Madryn no bioperturbado (PM NB, Punta Ninfas no erosionado (PN NE y Punta Ninfas erosionado (PN E. En muestras de suelos extraídas de 0 a 5 cm (PM y PN y de 0 a 10 cm (ML de profundidad se determinó la materia orgánica total (MOT y la MOP por vía húmeda (MOPh (Método Walkley y Black y por ignición en mufla (MOPi a 430 °C. En los Molisoles de ML y en los Aridisoles de PM la MOPi fue mayor que la MOPh, mientras que para los Aridisoles de PN no se registraron diferencias significativas entre los dos métodos. Para los suelos con carbonatos (PM o con alofanos (ML, el método por ignición sobreestimó los contenidos de MOP. La MOT presentó una alta correlación con la MOPh y con la MOPi para todos los suelos en conjunto (r² = 0,89 y r² = 0,73, respectivamente. El suelo que presentó una mayor relación MOP/MOT fue PN NE. En contraste, el suelo PN E, mostró los valores más bajos para esta relación, lo que indicaría, por un lado, que la poca MO que contienen estos suelos está predominantemente asociada a la fracciónParticulate organic-matter (MOP is a dynamic soil component that quickly and selectively responds to management changes and to different disturbance regimes. We compared two techniques to determine the MOP content in different soils and assessed the potential of this variable as an indicator of soil quality. We studied the soils of three ecological sites located

[Distribution patterns and bioerosion of the sea urchin Centrostephanus coronatus (Diadematoida: Diadematidae), at the reef of Playa Blanca, Colombian Pacific].

Science.gov (United States)

Toro-Farmer, Gerardo; Cantera, Jaime R; Londoño-Cruz, Edgardo; Orozco, Carlos; Neira, Raul

2004-03-01

Regular sea-urchins are one of the main bioeroding organisms affecting coral reefs around the world. The abundance, distribution and bioerosion rate of the sea-urchin Centrostephanus coronatus, were determined in different reef zones of Playa Blanca fringing reef (Gorgona Island, Colombian pacific coast) during 1997 and 1998. The erosion rates were determined calcinating the gut content of the sea-urchins to eliminate all organic components and preserve the inorganic portion of calcium carbonate. C. coronatus showed the highest densities towards the central zones of the reef (plain-crest and front) (12.4 ind/m2; range 0-48 ind/m2). The highest mean bioerosion rate was 0.103 kgCaCO3/m2/yr in the reef plain-crest (0-0.69 kgCaCO3/m2/yr). In the other zones, (back reef and reef front) the mean bioerosion rates were 0.071 (range 0-0.39) and 0.052 (range 0-0.31) kgCaCO3/m2/yr respectively. According to the present data, it can be seen that the destruction of coralline skeletons, produced in this reef by sea-urchins is rather low, compared with the abrasion caused by these organisms in other places of the world. However, the combined action of C. coronatus and other bioeroding organisms (borers and grazers). along with some adverse environmental factors to corals, can be causing a negative balance between normal processes of reef accretion-destruction in Gorgona Island reefs.

Technical procedures for water resources, Deaf Smith County site, Texas: Volume 1: Environmental Field Program: Final draft

International Nuclear Information System (INIS)

1987-08-01

This volume contains Technical Procedures pursuant to the Water Resources Site Study Plan including, determination of basin topographic characteristics, determination of channel and playa lake characteristics, operation of a stream gaging station, operation of a playa lake stage gaging system, and processing of data from a playa lake stage gaging system

Evaluación de los efectos agudos en la función pulmonar por exposición a material particulado fino (MP 2.5) en niños que viven próximos a una playa contaminada con relaciones mineros, Chañaral, Chile

OpenAIRE

Cáceres Lillo, Dante Daniel

2015-01-01

Introducción: Producto de la gran actividad minera de la III Región de Atacama en el norte de Chile se vertieron al curso del rio El Salado millones de toneladas de relaves (con alto contenido de metales) sin tratamiento al curso del Rio Salado, los que fueron a dar a la bahía de la ciudad de Chañaral formando una extensa playa artificial. Estos relaves han producido un marcado efecto deletéreo sobre la flora y fauna marina del sector y en la calidad de vida de las poblaciones que...

Evaluación de los efectos agudos en la función pulmonar por exposición a material particulado fino (MP 2.5) en niños que viven próximos a una playa masivamente contaminada con relaves mineros, Chañaral, Chile

OpenAIRE

Cáceres Lillo, Dante Daniel

2015-01-01

Introducción: Producto de la gran actividad minera de la III Región de Atacama en el norte de Chile se vertieron al curso del rio El Salado millones de toneladas de relaves (con alto contenido de metales) sin tratamiento al curso del Rio Salado, los que fueron a dar a la bahía de la ciudad de Chañaral formando una extensa playa artificial. Estos relaves han producido un marcado efecto deletéreo sobre la flora y fauna marina del sector y en la calidad de vida de las poblaciones que viven adyac...

Biología pesquera de la langosta Panulirus gracilis en Playa Lagarto, Guanacaste, Costa Rica

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Helven Naranjo Madrigal

2011-06-01

Full Text Available Los parámetros biológicos y pesqueros analizados se fundamentaron en una muestra de 843 langostas provenientes de la actividad pesquera realizada en Playa Lagarto entre noviembre del 2007 y octubre del 2008. Las longitudes cefalotoráxicas de los machos estuvo comprendida entre los 143.6 y 42.8 y 115 y 35.8mm para hembras. El 74.9% de las langostas en los desembarques estuvo por debajo de la talla mínima legal de captura (80 mm de LC. La estructura de tallas muestra un considerable solapamiento de segmentos poblacionales y el incremento de las tallas con la profundidad en donde operan las dos modalidades de pesca estudiadas: el buceo a pulmón y el buceo con compresor. La proporción de sexos obtenida fue de 1.36 M:H. La relación entre LC y peso reveló que las hembras pesan más que los machos de una misma talla y que esta diferencia fue significativa (p<0.05. Los parámetros de crecimiento de von Bertalanffy para machos y hembras respectivamente (K=0.45-0.38, LC∞=166.9-121.7 indican un crecimiento acelerado en comparación a otras especies. Los machos por su parte exhibieron una mayor tasa de crecimiento que las hembras. Además, la mortalidad natural (M, la mortalidad total (Z y la mortalidad por pesca (F fue más alta en machos (0.49-2.34-1.92 que en hembras (0.47-1.82-1.42. El reclutamiento para ambos sexos presentó un comportamiento continuó durante el año con un pulso de mayor intensidad en julio de 18.5%. El significativo porcentaje de langostas por debajo de la talla mínima legal permitida para la pesca evidencia fuerte presión ejercida sobre las tallas juveniles. Afirmación que es reforzada por el valor de la tasa de explotación (E determinada de 0.80, que indica que bajo el actual régimen de pesca la población estaría en riesgo de colapso.

CONCENTRACIÓN DE MINERALES DE TITANIO CONTENIDOS EN LAS ARENAS DE PLAYAS DE LA REGIÓN DE ATACAMA - CHILE

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Luis Valderrama Campusano

2008-07-01

Full Text Available El presente trabajo tiene como fin caracterizar y concentrar minerales de titanio contenidos en las arenas de playas de la Región de Atacama. El análisis mineralógico indicó que los principales constituyentes son cuarzo, feldespato, ilmenita, titanita, rutilo y trazas de circonita, monacita y wolframita. Los análisis químicos indican que la ley de TiO2 es de 2,3% y 3,15% para las arenas de Huasco y Caldera, respectivamente. Al retirar el material sobre 0,300 mm, se produce una preconcentración, aumentando las leyes de TiO2 a 5,33% para Huasco y 6,48% para Caldera. Las pruebas de concentración gravitacional fueron realizadas en una mesa Wilfley, y fueron estudiados diferentes ángulos de inclinación de la mesa, para la concentración primaria (2,5°; 3,0°; 3,5º y 4,0° y la limpieza (5,0°; 5,5; 6,0° y 6,5° respectivamente. Los mejores resultados fueron obtenidos usando un ángulo de inclinación de 3,0° para la concentración primaria y 6,0° para limpiar el concentrado. Con estos resultados se diseñó un circuito para las arenas de Huasco, lográndose un concentrado final con una ley de 46,0% de TiO2 y una recuperación de 21,2%, y para Caldera, se obtuvo un concentrado final de 51,3% TiO2 con una recuperación de 17,4%.

Particulate Matter Sources and Composition near a Shrinking Saline Lake (Salton Sea)

Science.gov (United States)

Frie, A. L.; Dingle, J. H.; Garrison, A.; Ying, S.; Bahreini, R.

2017-12-01

Dried lake beds (playas) are large dust sources in arid regions, and with increased global water demand many large lakes are shrinking. The Salton Sea is an example of one such lake in the early stages of desiccation, with about 15,000 acres of exposed playa. To quantify the impacts of the shrinking lake on airborne particulate matter(PM) composition, PM samples were collected in August of 2015 and February of 2016 near the Salton Sea, CA. These samples were analyzed for total elemental concentration of 15 elements. For these elements, enrichment factors relative to aluminum were calculated and PMF modeling was applied to deconvolve source factors. From these data, desert-like and playa-like sources were estimated to accounted for 45% and 9% of PM10 mass during these sampling periods. PMF results also revealed that playa sources account for 70% of PM10 Na, evidencing playa-driven PM compositional changes. Additionally, PM Se displayed strong seasonal variation, which is thought to be driven by Se volatilization within Salton Sea sediments, playas, or waters.

U-Pb and Lu-Hf zircon geochronology of the Cañadón Asfalto Basin, Chubut, Argentina: Implications for the magmatic evolution in central Patagonia

Science.gov (United States)

Hauser, N.; Cabaleri, N. G.; Gallego, O. F.; Monferran, M. D.; Silva Nieto, D.; Armella, C.; Matteini, M.; Aparicio González, P. A.; Pimentel, M. M.; Volkheimer, W.; Reimold, W. U.

2017-10-01

The Cañadón Asfalto basin, central Chubut, Argentina, comprises a volcano-sedimentary sequence related to the opening of the Atlantic Ocean during Mesozoic times. The Lonco Trapial, Cañadón Asfalto and Cañadón Calcáreo formations are the main units related to the evolution of this basin. The Las Chacritas and Puesto Almada members are distinguished in the Cañadón Asfalto Formation. LA-HR-ICP-MS U-Pb and Lu-Hf data on zircon were obtained on these units. The Lonco Trapial Formation gave a weighted average age of 172.3 ± 1.8 Ma. A pyroclastic level from the Las Chacritas Member gave a weighted average age of 168.2 ± 2.2 Ma. Two U-Pb concordant ages of 160.3 ± 1.7 Ma on a laminated tuffite and 158.3 ± 1.3 Ma on a pyroclastic level were obtained for the Puesto Almada Member. Two maximum depositional ages constrain the sedimentary provenance areas for the basin: 1) A sample from the Sierra de la Manea range, where a controversial unit related either to the Cañadón Asfalto or to the Cañadón Calcáreo formation occurs, gave an age of 176.6 ± 1.0 Ma. Two younger zircon crystals indicate that this unit may be related to the Cañadón Calcáreo Formation. 2) A sandstone with cross-stratification from the Puesto Almada Member gave a maximum depositional age of 173.6 ± 6.4 Ma. In terms of U-Pb and Lu-Hf isotopes, two magmatic events are identified in central Patagonia: the Mamil Choique magmatic event characterized by negative εHf values around -5.0 and representing recycling during Permian times of Mesoproterozoic crust (TDM of ∼1.5 Ga), and the Cañadón Asfalto magmatic event with negative (-8.2) to positive (+4) εHf values and Meso- to Neoproterozoic TDM between 1.5 and 0.8 Ga. The younger event is characterized by three main cycles: C1 related to the Lonco Trapial magmatism, C2 to the Las Chacritas volcanism, and C3 to the Puesto Almada volcanism. These cycles are related with Marifil, Chon Aike and El Quemado formations volcanics events of

Revisión sistemática del género Halictillus (Hymenoptera: Halictidae: Augochlorini en la Argentina Systematic revision of the genus Halictillus (Hymenoptera: Halictidae: Augochlorini in Argentina

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Rocío A. González-Vaquero

2010-06-01

Full Text Available Entre los grupos basales de la tribu Augochlorini, se encuentra el género de abejas Halictillus Moure, con sólo dos especies descriptas y ninguna revisión sistemática hasta el momento. En este trabajo, se describen cuatro especies nuevas de Halictillus de la Argentina y Chile. Las especies nuevas son: H. amplilobus sp. nov. (de Buenos Aires, Córdoba y Río Negro, H. peninsularis sp. nov. (de la Península de Valdés, Chubut, H. badiclypeus sp. nov. (de Mendoza, La Rioja y Catamarca y H. reticulatus sp. nov. (de las zonas occidentales de Chubut, Neuquén y Río Negro en la Argentina, y las regiones de La Araucanía y Los Lagos en Chile. Se presenta una clave para la determinación de las seis especies que componen el género, así como descripciones detalladas, imágenes de microscopio electrónico de barrido y un mapa de distribución geográfica de las especies nuevas.Among the basal genera of the tribe Augochlorini is the bee genus Halictillus Moure, which comprises only two described species and has no systematic revision at the moment. Four new species of Halictillus from Argentina and Chile are described in this contribution: H. amplilobus sp. nov. (from Buenos Aires, Córdoba and Río Negro Provinces, H. peninsularis sp. nov. (from Península Valdés, Chubut Province, H. badiclypeus sp. nov. (from Mendoza, La Rioja and Catamarca Provinces and H. reticulatus sp. nov. (from western Chubut, Neuquén and Río Negro Provinces in Argentina, and the regions of La Araucanía and Los Lagos in Chile. A key to the six species of the genus, as well as detailed descriptions, scanning electron microscope images and a map with distributional data of the new species are provided.

Ground truthing for methane hotspots at Railroad Valley, NV - application to Mars

Science.gov (United States)

Detweiler, A. M.; Kelley, C. A.; Bebout, B.; McKay, C. P.; DeMarines, J.; Yates, E. L.; Iraci, L. T.

2011-12-01

During the 2010 Greenhouse gas Observing SATellite (GOSAT) calibration and validation campaign at Railroad Valley (RRV) playa, NV, unexpected methane and carbon dioxide fluctuations were observed at the dry lakebed. Possible sources included the presence of natural gas (thermogenic methane) from oil deposits in the surrounding playa, and/or methane production from microbial activity (biogenic) in the subsurface of the playa. In the summer of 2011, measurements were undertaken to identify potential methane sources at RRV. The biogenicity of the methane was determined based on δ13C values and methane/ethane ratios. Soil gas samples and sediments were collected at different sites in the playa and surrounding areas. The soils of the playa consist of a surface crust layer (upper ~ 10 cm) grading to a dense clay below about 25 cm. Soil gas from the playa, sampled at about 20 and 80 cm depths, reflected atmospheric methane concentrations, ranging from 2 to 2.4 ppm, suggesting that no methane was produced within the playa. Natural springs on the northeast and western border of the playa, detected as methane hotspots from a flyover by the Sensor Integrated Environmental Remote Research Aircraft (SIERRA), were also sampled. Bubbles in these springs had methane concentrations that ranged from 69 to 84% by volume. In addition, ethane was detected at very low concentrations, giving methane/ethane ratios in excess of 100,000, indicating biogenic methane in the springs. Soils and sediments collected at the playa and spring sites were incubated in vials over a period of ~23 days. Methane production was observed in the spring sites (avg. 228.6 ± 49.1 nmol/g/d at Kate Springs), but was not evident for the playa sites. The incubation data, therefore, corroborated in situ methane concentration measurements. Particulate organic carbon (POC) was low for all sites samples (0.05-0.38%), with the exception of Kate Springs, which had a much higher POC concentration of 3.4 ± 0

Preliminary results on quaternary studies from Bajestan Basin (Kavir-e Namak), Iran

Science.gov (United States)

Majid Padashi, Seyed; Büdel, Christian; Ullmann, Tobias; Tintrup, Angela; Baumhauer, Roland

2017-04-01

The increasing population and demand for developing infrastructures on the one hand, and the recent issues on water and air quality on the other hand, in addition to droughts and the shrinking of many wetlands and lakes, have encouraged Iran recently to invest more in palaeoenvironmental research - specifically on quaternary basins. Preliminary results of our study through field work, satellite imagery processing, SRTM data analysis and drilling, have created new insights on the Iranian playas and the history of the lakes. A combined geological and geomorphological approach for studying young lakes and playas of Iran has led to the identification of at least five major types of lakes and playas in different parts of Iran; for example the Bajestan basin which ranks the second biggest playa of Iran, is placed in the edge of the central Iranian microplate and Lut structural block. The Bajestan Playa (Kavir-e Namak) is surrounded by cretaceous limestones in the south and Paleozoic formations in the north. The basin comprises several kinds of quaternary deposits including sand dunes and Aeolian deposits, fluvial sediments, alluvial fans and lake sediments. The aeolian activity in the basin is primarily shaping landforms in the southwest and the north of the area. The major fluvial activity is considered to be driven from east and south of the playa. The integration of field observations and data derived from the analysis of SRTM digital elevation model (90m) and Landsat satellite imagery shows that the major part of the playa has flat slope. In addition, the morphometric assessment and the hydrological modelling showed that the major current alluvial channels have SW/NE trend with the highest density and intensity of activity in south west of the basin. The major alluvial deposits in the north and south of the playa represent a dissimilar geomorphology. While the northern part of the basin, from the rock unit outcrops to the edge of playa, is occupied by a narrow

Septic tanks as larval habitats for the mosquitoes Aedes aegypti and Culex quinquefasciatus in Playa-Playita, Puerto Rico.

Science.gov (United States)

Burke, R; Barrera, R; Lewis, M; Kluchinsky, T; Claborn, D

2010-06-01

Adult Aedes aegypti (Linnaeus) (Diptera: Culicidae) were previously recovered from emergence traps on septic tanks in southeastern Puerto Rico. In this study we quantified immature mosquito abundance and its relationship with structural variables of the septic tanks and chemical properties of the water containing raw sewage. A miniaturized floating funnel trap was used to sample 89 septic tanks for larvae in the Puerto Rican community of Playa-Playita. Aedes aegypti larvae were recovered from 18% of the sampled tanks (10.3 larvae per septic tank per day). Larval presence was positively associated with cracking of the septic tank walls and uncovered access ports. Larval abundance was positively associated with cracking of the septic tank walls and larger tank surface areas, and inversely associated with the total dissolved solids (TDS). Culex quinquefasciatus (Say) larvae were also recovered from 74% of the septic tanks (129.6 larvae per septic tank per day). Larval presence was negatively associated with TDS in the water and larval abundance was positively associated with cracking of the septic tank walls. A screened, plastic emergence trap was used to sample 93 septic tanks within the community for Ae. aegypti and Cx. quinquefasciatus adults. Aedes aegypti adults were recovered from 49% of the sampled tanks (8.7 adults per septic tank per day) and Cx. quinquefasciatus adults were recovered from 97% of the sampled tanks (155.5 adults per septic tank per day). Aedes aegypti adult presence was positively associated with cracking, uncapped openings and septic water pH. The Ae. aegypti adult counts were positively associated with cracking and inversely associated with TDS and conductivity. This study marks the first published record of the recovery of Ae. aegypti larvae from holding tanks containing raw sewage in the Caribbean region. Our study indicates that Ae. aegypti larvae are present in sewage water and that septic tanks have at least the potential to maintain

Deposition and diagenesis of the Brushy Basin Member and upper part of the Westwater Canyon member of the Morrison Formation, San Juan Basin, New Mexico

International Nuclear Information System (INIS)

Bell, T.E.

1986-01-01

The Brushy Basin Member and the upper part of the Westwater Canyon Member of the Morrison Formation in northwest New Mexico are nonmarine sedimentary rocks of Late Jurassic age. This stratigraphic interval consists of as many as four lithofacies deposited in fluvial and playa-lake environments. Lithofacies A is composed of crossbed feldspathic sandstone and was deposited by braided streams on an alluvial plain. Lithofacies B is composed of crossbedded feldspathic sandstone and tuffaceous mudstone, and was deposited by braided and anastomosing streams at the distal end of the alluvial plain. Lithofacies C is composed of calcareous, tuffaceous mudstone and was deposited on a mudflat between the alluvial plain and a playa lake. Lithofacies D is composed of zeolitic, tuffaceous mudstone and was deposited in a playa lake. The distribution of diagenetic facies in mudstones and tuffs in the Brushy Basin Member and upper part of the Westwater Canyon Member reflects the pH and salinity gradients common to fluvial/playa-lake systems. The abundant vitric ash in the sediments reacted to form montmorillonite in the fluvial facies. Calcite and montmorillonite were the reaction products where the fluvial and outermost playa facies met. Vitric ash reacted to form clinoptilolite and heulandite along the playa margins. In the center of the playa facies, analcime replaced clinoptilolite, an early zeolite. These early diagenetic minerals were replaced by albite, quartz, and mixed-layer illitemontmorillonite where the Brushy Basin Member and upper part of the Westwater Canyon Member have been deeply buried in the San Juan basin

Futuro del turismo de masas sol y playa del litoral mediterráneo español / Future mass tourism of sun and beach Spanish Mediterranean littoral

Directory of Open Access Journals (Sweden)

Marta Collado Lara

2013-01-01

Full Text Available ResumenLa situación problemática de los destinos maduros de demanda masiva sol y playa del litoral español y las medidas encaminadas, por las políticas turísticas, a la mejora de la pérdida de competitividad del sector, requieren un nuevo modelo de desarrollo turístico para estos destinos. El objetivo del trabajo, es aportar valor añadido al diseño de nuevos modelos de desarrollo turístico de futuro mediante la aplicación de las herramientas de prospectiva territorial, como instrumento capaz de reforzar procesos de planificación. Para mostrar la viabilidad de estas herramientas se lleva a cabo una valoración de similitudes o brechas entre dos modelos de desarrollo turístico; por un lado, un modelo de desarrollo hipotético de un destino maduro del litoral mediterráneo [utilizando las herramientas de prospectiva territorial] y, por otro, el modelo de desarrollo de un Proyecto Piloto de un caso real de planeamiento urbanístico. Los resultados de la valoración revelan que los dos modelos presentan muchas similitudes, lo que permite mostrar el potencial de la prospectiva territorial como instrumento para hacer frente a los problemas de desarrollo turístico plagados de complejidad e incertidumbre, así como su capacidad para reducir el análisis de los desafíos globales a las implicaciones locales y espaciales.Palabras claveDestinos maduros, prospectiva, demanda masiva sol y playa, incertidumbre, desarrollo turísticoAbstractThe problematic situation of the mature destinations of massive demand of sun and beach of the Spanish littoral and the measures directed to the improvement of the loss of competitiveness of the sector, demand a new model of tourist development for these destinations. The aim of the work is to supply added value to the design of new models of future tourist development by means of the application of the territorial foresight tools, as a tool able to reinforce planning processes. To demonstrate the viability of

Pesticide resistance from historical agricultural chemical exposure in Thamnocephalus platyurus (Crustacea: Anostraca)

Energy Technology Data Exchange (ETDEWEB)

Brausch, John M. [Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, 1207 Gilbert Dr, Lubbock, TX 79416 (United States)], E-mail: john.brausch@ttu.edu; Smith, Philip N. [Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, 1207 Gilbert Dr, Lubbock, TX 79416 (United States)

2009-02-15

Extensive pesticide usage in modern agriculture represents a considerable anthropogenic stressor to freshwater ecosystems throughout the United States. Acute toxicity of three of the most commonly used agricultural pesticides (Methyl Parathion 4ec, Tempo SC Ultra, Karmex DF, and DDT) was determined in two different wild-caught strains of the fairy shrimp Thamnocephalus platyurus. Fairy shrimp collected from playas surrounded by native grasslands were between 200% and 400% more sensitive than fairy shrimp derived from playas in agricultural watersheds for Methyl Parathion 4ec, Tempo SC Ultra, and Karmex DF, likely due to the development of resistance. Additionally, reduced sensitivity to DDT was observed among fairy shrimp from agriculturally-impacted playas as compared to those from native grassland-dominated playas. These data suggest that fairy shrimp inhabiting playas in agricultural regions have developed some degree of resistance to a variety of agrochemicals in response to historical usage. - This manuscript discusses the potential effects of long-term pesticide usage on the development of resistance and cross-resistance on a non-target aquatic invertebrate.

Climate and sea-level changes across a shallow marine Cretaceous–Palaeogene boundary succession in Patagonia, Argentina

NARCIS (Netherlands)

Vellekoop, Johan; Holwerda, Femke; Prámparo, Mercedes B.; Willmott, Veronica; Schouten, Stefan; Cúneo, Nestor R.; Scasso, Roberto A.; Brinkhuis, Henk

2017-01-01

Upper Maastrichtian to lower Paleocene, coarse-grained deposits of the Lefipán Formation in Chubut Province, (Patagonia, Argentina) provide an opportunity to study environmental changes across the Cretaceous–Palaeogene (K–Pg) boundary in a shallow marine depositional environment. Marine

Neogene and Quaternary foraminifera and paleoenvironments of a corehole from Horn Island, Mississippi

Science.gov (United States)

Gibson, Thomas G.

1994-01-01

The only semipermanent surface water available on the Southern High Plains plateau of Texas and New Mexico is contained in saline lakes and in the playa lakes that form in shallow depressions, called playa basins, following heavy rainfall. The playas generally are accepted as the main source of recharge to the underlying High Plains (Ogallala) aquifer of the region, and they constitute the major wildlife habitat on the Southern High Plains. Their use as water sources, holding ponds, and waste-disposal sites by agricultural and industrial operations may potentially lead to ground-water contamination and habitat degradation. Therefore, playa lakes will play an essential role in the collection of surface-water quality and ecological data for the Southern High Plains study unit of the National Water-Quality Assessment program of the U.S. Geological Survey.

[Reproductive pattern and mean size of sexual maturity of female lobsters Panulirus gracilis (Decapoda: Palinuridae) in Playa Lagarto, Guanacaste, Costa Rica].

Science.gov (United States)

Naranjo Madrigal, Helven

2012-12-01

The lobster P. gracilis is important as a fishery resource and also contributes to food security of fishers in coastal communities in the North Pacific of Costa Rica. Due to the importance of updating knowledge related to the reproductive pattern of this species, we analyzed 357 specimens of female lobsters caught by the fishing methods of "hookah" and lung diving, from November 2007 to October 2008 in Playa Lagarto. Furthermore, we examined the size composition by depth; monthly pattern of reproductive activity (RAI) associated with the relative increase in sea surface temperature, and also the mean size at maturity using Generalized Linear Models. Four physiological states of sexual maturity showed that females with no signs of mating or sexual maturity have a minimum mean size of 62.3mm of cephalothorax length (CL). There are characteristics of functional maturity from very small sizes ranging from 30 to 50mm CL, being the smallest berried female reported for this specie of 35.8mm CL and the highest percentage of mature females between 70 and 80mm CL. Percentages of RAI remained above 50% during the year except October and January. In addition, it observed an increase in the RAI that started from April and continued until August associated with a relative increase in temperature on March, although the correlation was not significant (r2=0.49, p>0.05). It is possible that the low mean size at maturity (70.2mm LC) for P. gracilis in this region is related to the fishing activity. It recommends the establishment of a ban in the region of at least five months (April-August) in order to protect the reproductive seasonality of the species and to promote a recruitment increase in the fishing areas.

FRUPAT: A Tool to Quantify Inputs and Outputs of Patagonian Fruit Production Systems

NARCIS (Netherlands)

Cittadini, E.D.; Keulen, van H.; Peri, P.L.

2006-01-01

A software called FRUPAT was developed for calculating input and output coefficients (Technical Coefficients) of fruit production systems in South Patagonia. FRUPAT combined locations (Río Chubut valley; Sarmiento valley; Los Antiguos valley; Río Chico valley), edaphic environment (good quality soil

Soñar con el futuro. Proyectos inmigratorios para la Patagonia argentina en Teodoro Alemann y Roberto J. Payró

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Jennifer M. Valko

2014-06-01

Taking into account recent studies on journalistic travel and Argentine nation building, this article examines the profile of a type of reporter that has been studied to a lesser degree, the immigrant journalist. It analyzes two travel chronicles about Patagonia published in Buenos Aires in 1898: Ein Ausflug nach dem Chubut-Territorium [An Excursion to the Chubut Territory] by Swiss journalist Theodor Alemann, published in the German-language newspaper Argentinisches Tageblatt [Argentine Daily], and La australia argentina, by Roberto J. Payró which appeared in La Nación. In both chronicles the narration of the trip to Patagonia is interrupted at a key moment by the telling of a dream regarding the future of the region. This essay demonstrates that these oneiric digressions reveal political and economic interests contrary to the official Argentine plans for the development of the region, the role of immigrants and their relationship with European powers.

Nuevo hospedador de Huequenia livida (Coleoptera: Cerambycidae en Argentina New host record for Huequenia livida (Coleoptera: Cerambycidae in Argentina

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José María Villacide

2006-07-01

Full Text Available La presencia de adultos de Huequenia livida (Germain, 1898 (Cerambycidae fue detectada en una plantación de Pinus contorta Douglas ex Loudon var. murrayana (Balf. Engelm. en la localidad de Lago Puelo (Chubut, Argentina. Este es el primer registro del desarrollo de H. livida en una especie hospedadora distinta de Araucaria spp. Esta contribución agrega una nueva especie y una nueva familia al listado de plantas hospedadoras descriptas para este Cerambycidae en Chile.Adult of Huequenia livida (Germain, 1898 (Cerambycidae were captured in a Pinus contorta Douglas ex Loudon var. murrayana (Balf. Engelm. plantation located in Lago Puelo ( Chubut , Argentina . This is the first mention of the development of H. livida on a host species different than Araucaria spp. This contribution also adds a new host species and family to the list of host plants described for this Cerambycidae in Chile .

Rasgos sedimentológicos de los fondos marinos de Maspalomas (Gran Canaria

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Constatino Criado Hernández

2013-11-01

Full Text Available En el transcurso de Ia expedición oceanográfica 132/2 del ES Poseidón dirigida por el profesor Dr. H. Klug (Grographisches Institut der Universitat Kiel, Alemania, se realizo un muestreo de los sedimentos superficiales en la plataforma continental comprendida entre la Playa de San Agustin y la Playa la Mujer. Se presentan aquí los resultados de los análisis granulométricos y carbométricos obtenidos sobre las muestras recogidas.During the oceanographical survey 132/2 (ES Poseidón leadered by the Dr. H. Klug (Grographisches Institut der Universitat Kiel, Germany were sampled surficial sediments from the continental shelf of Gran Canaria, between Playa San Agustín and Playa de la Mujer. We present the results of grain size and carbonate analysis got from the samples.

Identificación y diagnóstico de las fuentes de la basura marina en la costa de Manzanillo, Colima, México, durante las campañas de limpieza 2003-2006

OpenAIRE

Silva-Iñiguez, L.; Gutiérrez-Corona, C.G.; Pérez-López, R.; Cervantes, O.

2012-01-01

Este trabajo describe los resultados obtenidos en las campañas de limpieza de las playas ubicadas en las bahías de Manzanillo (San Pedrito, Brisas y Salagua) y Santiago (Audiencia, Santiago y Miramar), México en el periodo 2003-2006. El análisis de los datos, permitió identificar las fuentes de los desechos, y elaborar un diagnóstico de la basura marina o costera en dichas playas. Los residuos más comunes y abundantes en todas las playas fueron las colillas de cigarro y taparoscas de plástico...

MX Siting Investigation. Geotechnical Evaluation. Verification Study - Ralston Valley, Nevada. Volume II. Geotechnical Data.

Science.gov (United States)

1980-06-15

A3d). A4 Playa and Lacustrine Deposits - Deposits occurring in modern, active playas (A4) or in either inactive playas or older lake beds and abandoned...some f ine gravel 2 1 3403 3 4 vertical Smedium usal 2 10 de tnse GRAVELLY SAND,* brown *f ins to coarse, mell graded ,slightly moist ,sub- 12 o... lima 11𔄀-1 5 of ? - nRm NATIONAL, INS. 47 AFV-O1 -3 FN-TR-27-RV PERCENT FINER BY WEIGHT SAMPLE INTERVAL STANDARD SIEVE OPENING U S STAIIOA

Pesquería y biología de Rhinobatos percellens (Rajiformes: Rhinobatidae capturados por la pesquería artesanal de playa La Pared, Venezuela

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Alejandro Tagliafico

2013-03-01

Full Text Available Rhinobatos percellens es capturada en Venezuela por la flota artesanal que opera con redes de fondo. Está clasificada por la IUCN como casi amenazada, y no existen estudios sobre su biología o pesquería en el país. Por ello, se analizaron desembarques de la pesca artesanal de playa la Pared (isla de Margarita durante enero-diciembre 2007. A cada ejemplar capturado se le determinó la longitud total, sexo y madurez. Fueron analizados 210 ejemplares, 159 hembras y 51 machos. El 81% de los ejemplares se encontraban maduros y un 27% de este grupo correspondió a hembras grávidas. La talla media de madurez sexual quedó ubicada en 51 y 52cm para hembras y machos, respectivamente. Se detectaron hembras maduras todo el año, y hembras grávidas en siete meses. Fueron analizados 96 embriones con tallas entre 2-19cm, siendo la fecundidad máxima cuatro embriones. La variación de las longitudes de los embriones entre los meses del año indican dos picos máximos de alumbramiento al año pero no existe una sincronía en la cópula ya que la especie se reproduce prácticamente todo el año. Se recomienda elaborar regulaciones pesqueras que incluyan una talla mínima de captura en función de la talla de madurez señalada y liberar las hembras grávidas al agua.

Hidrodinámica aplicada a la gestión y la conservación de ecosistemas marinos y costeros: Isla Gorgona, Océano Pacífico Colombiano

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Andrés F. Osorio A.

2014-02-01

Full Text Available Playa Palmeras (En el Parque Nacional Isla Gorgona es uno de los sitios más importantes para la anidación de tortugas marinas en América del Sur y Centroamérica. Debido a procesos morfológicos que afectan la playa, los nidos de las tortugas se han visto cada vez más expuestos al impacto del oleaje y la marea, poniendo en riesgo la conservación de éstas especies. Se llevó a cabo un estudio para conocer los procesos hidrodinámicos de la zona costera en Playa Palmeras, de los cuales depende el comportamiento morfodinámico de la playa y la preservación de los nidos. Se usó modelación numérica y mediciones en campo para conocer la variabilidad espacio-temporal del oleaje y obtener los patrones generales de circulación y la estructura termohalina de la zona. Se encontró un marcado ciclo anual, tanto en el oleaje como en las corrientes, influenciado por la Zona de Convergencia Intertropical (ZCIT y una variabilidad interanual del oleaje, asociada a El Niño Oscilación del Sur (ENSO. Se estimó la cota de inundación de la playa y se crearon mapas de probabilidad de inundación, identificando los sitios potencialmente más seguros para la anidación. Los resultados muestran que hacia el norte de la playa está la zona de menor riesgo.

Major Rehabilitation of the Jetty System at the Mouth of the Columbia River

Science.gov (United States)

2012-06-01

coriacea (Testadines: Dermochelyidae) en playa Gandoca, Costa Rica (1990 a 1997). Revista de Biologia Tropical 47 (1-2):225-236. Chaloupka, M. 2001...coriacea (Testadines: Dermochelyidae) en playa Gandoca, Costa Rica (1990 a 1997). Revista de Biologia Tropical 47 145 (1-2):225-236. Chaloupka

76 FR 6847 - Endangered and Threatened Wildlife and Plants; Final Revised Critical Habitat for Brodiaea...

Science.gov (United States)

2011-02-08

... vernal pool or playa complexes that support various grassland, scrub, or riparian herb communities; (3... pool or playa complexes. These soils are generally vegetated with open native and nonnative grassland... able to travel greater distances and cross fragmented landscapes to pollinate B. filifolia. In a study...

La experiencia de la guerra en la pantalla: El desembarco en la playa de Omaha de Saving Private Ryan

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Julio Montero-Díaz

2015-01-01

Full Text Available El cine de Hollywood ha dado un testimonio informal de las guerras, particularmente de la Segunda Guerra Mundial. Saving Private Ryan (Steven Spielberg, 1998 rompió el modelo naturalista y romántico del subgénero. Se basó en el testimonio de los veteranos de guerra y se orientó no hacia el desarrollo de una operación bélica, sino a la reproducción hiperrealista del combate y la cotidianidad de la guerra. Dio forma audiovisual a una memoria y experiencia individuales, las del veterano, que habitualmente no habían tenido cabida en el relato institucional de la guerra o en su reflejo cinematográfico anterior. Este artículo presenta un análisis estilístico de su secuencia más aplaudida por su efecto y valor artístico: el desembarco en la playa de Omaha. Atiende a la descripción de sus recursos de planificación, sonido y montaje. Muestra que, a través del recurso a técnicas estilísticas expresivas formuladas por S. M. Eisenstein, la secuencia busca introducir al espectador en el combate, hacerle participar de las sensaciones y razonamientos del soldado –en este caso el capitán Miller–, y lograr así su inmersión en la acción bélica, su compromiso con él y la comprensión del origen de su trauma. Para ello se ha recurrido a una vía de análisis inspirada en el proceso metodológico que S. M. Eisenstein empleaba en dos de sus artículos para explicar el valor del planteamiento estilístico de El acorazado Potemkin (1925 a sus detractores. Consiste en la descripción del esquema expresivo que configura el diseño de planos y fragmentos de montaje y su comparación con los que los preceden o suceden. Mediante esta metodología dialéctica, se describe el estilo general de la secuencia y sus pretensiones expresivas, así como se localizan momentos de contraste y ruptura que acusan su servicio a un motivo emocional: traducir el trauma del combatiente.

78 FR 8702 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to the Foreign...

Science.gov (United States)

2013-02-06

.... DONO MORALES, Edman Manuel, Privada Niza 3617 Int. 2, Colonia Playas de Tijuana, Tijuana, Baja...; R.F.C. QUHM-701022-TL3 (Mexico) (individual) [SDNTK]. 14. RUELAS MARTINEZ, Jose Manuel, 402... (individual) [SDNTK]. 16. RUELAS MARTINEZ, Jose de la Cruz, Calle de la Ventisca 640, Colonia Playas Seccion...

75 FR 35125 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to the Foreign...

Science.gov (United States)

2010-06-21

... California CP 22000, Mexico; Calle Granito No. 2025, Seccion El Dorado, Fraccionamiento Playas de Tijuana, Tijuana, Baja California, Mexico; Calle Granito No. 602, Seccion El Dorado, Fraccionamiento Playas de... blocked pursuant to the Kingpin Act. 1. Carrillo Rodriguez, Luis Miguel, c/o VUELA PERU S.A.C., Lima, Peru...

Aplicación de directrices de calidad para la gestión y uso turístico de balnearios y playas

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Claudia Toselli

2011-01-01

Full Text Available La aplicación de estándares de calidad es hoy un tema prioritario en las agendas del turismo internacional. Particularmente, en los últimos años, se ha dedicado mucho esfuerzo al establecimiento de códigos, criterios y sistemas de certificación turística para orientar tanto a los operadores turísticos y los actores locales, como a los propios turistas. En Argentina, ante la necesidad de abocarse a la mejora de la calidad ambiental y turística de la prestación de servicios en playas, los organismos nacionales rectores en materia de turismo, por un lado, y de medio ambiente, por el otro, aunaron esfuerzos para la elaboración de un conjunto de directrices que promovieran la gestión de calidad y el cuidado ambiental en áreas costeras y litorales fluviales, lacustres y marítimas. Estas directrices establecen una serie de lineamientos específicos al respecto, particularmente proveen un marco de referencia para la prestación de servicios en dichas áreas, y actualmente están incluidas en el Sistema Argentino de Calidad Turística. En esta línea, el objetivo de este trabajo ha sido conocer en qué grado estas directrices son aplicadas en balnearios en proceso de consolidación. Para ello se tomaron como estudio de caso dos balnearios de la provincia de Entre Ríos, ubicados en la localidad de Gualeguaychú sobre el margen del río del mismo nombre y bajo concesión por parte del sector privado. A partir de la aplicación de dichas directrices se reconoce que éstas son consideradas de manera parcial en ambos balnearios, lo cual puede encontrar explicación en la falta de obligatoriedad de las mismas. Por lo tanto, en esta directriz se indican algunas recomendaciones sobre las que los balnearios seleccionados tendrían que seguir trabajando y profundizando.

75 FR 23608 - Final Flood Elevation Determinations

Science.gov (United States)

2010-05-04

... Potter County. 287 and South Parsley Road. Playa Lake 6 Approximately 1,000 feet +3624 City of Amarillo... feet +3596 City of Amarillo, northeast of the Unincorporated Areas of intersection of Parsley Potter... County. intersection of Highway 287 and South Parsley Road. Playa Lake 4 At the intersection of +3699...

Activation of a small ephemeral lake in southern Jordan during the last full glacial period and its paleoclimatic implications

Science.gov (United States)

Catlett, Gentry A.; Rech, Jason A.; Pigati, Jeffrey S.; Al Kuisi, Mustafa; Li, Shanying; Honke, Jeffrey S.

2017-01-01

Playas, or ephemeral lakes, are one of the most common depositional environments in arid and semiarid lands worldwide. Playa deposits, however, have mostly been avoided as paleoclimatic archives because they typically contain exceptionally low concentrations of organic material, making 14C dating difficult. Here, we describe a technique for concentrating

Patrones de distribución y tasas de bioerosión del erizo Centrostephanus coronatus (Diadematoida: Diadematidae, en el arrecife de Playa Blanca, Pacífico colombiano

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Gerardo Toro-Farmer

2004-03-01

Full Text Available Los erizos regulares son uno de los principales grupos de organismos bioerosionadores que destruyen los arrecifes coralinos alrededor del mundo. En el presente estudio se determinaron los patrones de distribución y abundancia y las tasas de carbonato de calcio removido en el arrecife de Playa Blanca por Centrostephanus coronatus, una de las especies de erizos más abundante en este arrecife. Para este fin se realizaron cuatro visitas al arrecife entre 1997 y 1998 durante las cuales se contabilizó el número de individuos en cada una de las principales zonas arrecifales (Trasarrecife, Plataforma-Cresta, Frente, y Talud. Las tasas de erosión fueron determinadas por medio del análisis del contenido estomacal de un número representativo de individuos colectados en cada zona. Cada sistema digestivo fue calcinado para eliminar la materia orgánica y conservar solamente la porción inorgánica de carbonato de calcio. C. coronatus presentó sus mayores densidades hacia las zonas centrales del arrecife (12.4 ind/m² ; rango 0-48 ind/m² . La tasa de bioerosión promedio más alta de C. coronatus fue de 0.103 kgCaCo3 /m² /año en la Plataforma-Cresta (rango 0 a 0.69 kgCaCo3 /m² /año. En las otras zonas (trasarrecife y frente las tasas promedio de erosión fueron 0.071 (0-0.39 y 0.052 (0-0.31 kgCaCo3 /m² /año respectivamente. De acuerdo con estos datos fue posible comprobar que la destrucción de esqueletos de corales en este arrecife por esta especie de erizo es baja, comparada con la acción abrasionadora de este tipo de organismos en otras partes del mundo. Sin embargo, la acción combinada de C. coronatus con otros organismos bioerosionadores y con algunos factores ambientales adversos para los corales, puede estar provocando un desbalance entre los procesos normales de contrucción-destrucción arrecifal en la Isla GorgonaRegular sea-urchins are one of the main bioeroding organisms affecting coral reefs around the world. The abundance

Journal of Earth System Science | Indian Academy of Sciences

Indian Academy of Sciences (India)

Keywords. Hydrology; modelling; wetlands; irrigation. Abstract. The subject of this paper is the detailed hydrological simulation of two playa lakes located in southern Spain from January 2011 to March 2012 on a daily basis. These playas are placed over a 400-km2 shallow aquifer, which is exposed to an increasing stress ...

Knowing the Place for the First Time: A Cuban Exile’s Story

Directory of Open Access Journals (Sweden)

Alejandra Morena

2009-03-01

Full Text Available Playa Abierta is a modern beach-side resort, one hundred kilometres west of Havana. Developed as a private resort in the 1950s, it was seized by the new revolutionary Cuban government in 1959 after its owner fled precipitately to Miami. This autobiographically centred and personally narrated paper reviews the history of Playa Abierta 1956 – 2006 through the eyes of a Cuban New Zealander ‘Marta’ whose uncle first developed the estate. In 1956 her holidays spent at Playa Abierta as a little girl were her most treasured Cuban moments. ‘At this altar’, she says, ‘my uncle was the high priest.’ In 1996 - after a 36-year absence from her native land - she returned for a visit, the only member of her extended family to have done so. Boldly and unannounced she walked through her uncle’s house – by then converted into a military recreational camp. On a subsequent visit, she met with members of her uncle’s domestic staff whose relationship to that same loved beach was by then of many decades. Whose Playa Abierta was she re-visiting now? Who were the true claimants to that family sacred site? Today as she reflects on the private and public meaning of Playa Abierta, her exultation has given way to more complex feelings. The wonder at re-discovering the beach’s beauty was overladen with the guilt of returning to Cuba while still under Castro’s communist rule. Her sense of belonging was later undermined by a sad realisation that those who had stayed behind were also Playa Abierta’s claimants. Above all, she is torn between family loyalties and the promise of a Revolution betrayed.

75 FR 319 - Endangered and Threatened Species: Proposed Rule To Revise the Critical Habitat Designation for...

Science.gov (United States)

2010-01-05

...) and the Pacific (Playa Grande, Costa Rica) and found that the range of temperatures producing both... that nested at Playa Grande, Costa Rica, was estimated to be 34.6 percent in 1993-1994 and 34.0 percent... dive time traveling to and from maximum depth, suggesting that efficient transit of the water column is...

Harnessing maize biodiversity

Science.gov (United States)

Maize is a remarkably diverse species, adapted to a wide range of climatic conditions and farming practices. The latitudinal range of maize is immense, ranging from 54°N in Alberta, Canada, to 45°S in the province of Chubut, Argentina. In terms of altitude, maize is cultivated from sea level to 4000...

Hydrogeomorphic (HGM) Approach to Assessing Wetland Functions: Guidelines for Developing Guidebooks (Version 2)

Science.gov (United States)

2013-06-01

time, travel time, field data collection, and analysis (Whigham et al. 2007, Kleindl et al. 2010, Berkowitz et al. 2011). Several different...they occur. Prairie potholes, playa lakes, vernal pools, Carolina Bays, and cypress domes are common examples of depression wetlands. Tidal Fringe...Large playas Flat (organic soil) Precipitation Vertical Peat bogs; portions of Everglades Peatlands over permafrost Riverine Overbank flow from

Dependence on Solar Phase Angle and Grain Size of the Spectral Reflectance of the Railroad Valley Playa for GOSAT/GOSAT-2 Vicarious Calibration

Science.gov (United States)

Arai, T.; Matsunaga, T.

2017-12-01

GOSAT and the next generation GOSAT-2 satellites estimate the concentration of greenhouse gasses, and distribution of aerosol and cloud to observe solar light reflection and radiation from surface and atmosphere of the Earth. Precise information of the surface and the bidirectional reflectance distribution function (BRDF) are required for the estimation because the surface reflectance of solar light varies with the observation geometry and the surface condition. The purpose of this study is to search an appropriate BRDF model of the GOSAT calibration site (Railroad Valley playa). In 2017, JAXA, NIES, and NASA/OCO-2 teams collaboratively performed 9th vicarious experiments by the simultaneous observation with GOSAT, OCO-2, and ground-based equipment (Kuze et al., 2014) at the Railroad Valley from June 25 to 30. We performed the BRDF measurement to observe solar light reflection by varying with observed angles using a spectroradiometer (FieldSpec4, ASD Inc.) mounted on a one-axis goniometer. The surface sand was shifted to several sizes of grain (75, 125, 250, 500, and 1000 μm), which was measured for the limited area of 5mm diameter with a collimating lens (74-UV, OceanOptics). The BRDF parameters for the observed reflectance were determined by the least squares fitting with the free parameters of a single scattering albedo and an asymmetric factor (Hapke, 2012) for the ultraviolet to near infrared wavelength bands of GOSAT. The resulting value of the single scattering albedo increased with decreasing the grain size of the sands. The observed reflectance of the fine grain sands (below 250 μm) is not varied with observed phase angles (solar incident light - surface sand - detector) as a Lambertian reflectance, but the spectra of coarse grain sands (above 500 μm) are varied with the observation angles. Therefore, a priori information of the target surface such as grain size is required for the determination of the precise reflectance of the target.

[Community structure of sponges (Porifera) in three reefs at Morrocoy National Park, Venezuela and its correspondence with some environmental variables].

Science.gov (United States)

Romero, Marco A; Villamizar, Estrella; Malaver, Nora

2013-09-01

Sponges have an important ecological role in coral reef ecosystems. However, when compared to other benthic Phyla, it has been little researched. This research was focused in the variability of the community structure of sponges in three locations at Morrocoy National Park (Cayo Sombrero, Playa Mero and Punta Brava) exposed to different environmental conditions (transparency and currents intensity) and affected in different degree of severity by a mass mortality event in 1996. A total of 15 transects (10 m long and 1 m wide) were evaluated in three strata (between 3 and 15 m depth) in each site, where all the individuals were counted by species. Relative abundance by species, diversity and evenness were calculated. Locations showed differences respect turbidity, wave and current intensity. 27 species were found in Morrocoy; Cayo Sombrero (23), Playa Mero (18) and Punta Brava (15). Agelas sceptrum, Amphimedon erina and Niphates erecta were the most common in first location; Niphates erecta and Dysidea etheria in Playa Mero and Dysidea etheria, Niphates erecta and Amphimedon erina in Punta Brava. The species composition showed statistical differences between all three locations; Cayo Sombrero resulted the most diverse and even, followed by Playa Mero and Punta Brava. According to Sorensen Similarity Index results, Cayo Sombrero and Playa Mero were more similar, while Punta Brava resulted the most different. The variability in environmental conditions and the differential mass mortality effects of 1996 in all three reefs, were probably the main causes of the differences between their sponge communities. Nevertheless, we cannot conclude about the weight of these factors.

A Regional Guidebook for Applying the Hydrogeomorphic Approach to Assessing Functions of Forested Wetlands in the Delta Region of Arkansas, Lower Mississippi River Alluvial Valley, Version 2.0

Science.gov (United States)

2011-09-01

intermittent or perennial outlets, or recharge to groundwater. Prairie potholes, playa lakes, and cypress domes are common examples of depressional...Precipitation Vertical Wet pine flatwoods Large playas Flat (organic soil) Precipitation Vertical Peat bogs; portions of Everglades Peatlands over... travelers remarked upon as common features of the natural levees (Remsen 1986, Dickson 1991). In turn, the loss of the canebrakes may have contributed to

A community in the wildland-urban interface

Science.gov (United States)

María Cecilia Ciampoli Halaman

2013-01-01

Communities located in the wildland-urban interface undergo a process of transformation until they can guard against fires occurring in the area. This study analyzed this process for the Estación neighborhood in the city of Esquel, Chubut Province, Argentina. The analysis was performed by comparing the level of danger diagnosed for each neighborhood home in 2004 with...

Programmatic Environmental Assessment for Army 2020 Force Structure Realignment

Science.gov (United States)

2012-11-01

The Basin Alluvial EMU consists of silt and clay soils in low-lying playas and other depressions 28 that are subject to occasional flooding. The...control 17 features. Playas (flat-bottomed depressions that are periodically covered by water) are also 18 present, and additional small wetlands are...drain 13 wastewaters are connected to the IWTF. 14 The Wilderness Road Complex, the Colorado Army National Guard Centennial Training Site 15 and

Forecasting Climate-Induced Ecosystem Changes on Army Installations

Science.gov (United States)

2011-10-01

for this area by 2050. To find the best current example of conditions estimated for 2080 one needs to travel to the east area in Georgia. The Hadley...anticipated future conditions for the installation. In general one must travel south, or down-slope, to find the anticipated future conditions today...Tableland []3301) Western Great Plains Badland []3405) North American Warm Desert Playa []J407) Inter-Mountain Basins Playa []3501) North Pacific

Live Site Demonstration Munitions Response Program Site UXO 01 at Marine Corps Air Ground Combat Center (MCAGCC) Twentynine Palms, California

Science.gov (United States)

2015-11-01

unconsolidated deposits of eolian sand, alluvial sands and gravels, and lacustrine silts, clays, and evaporates in playa lakes. The near-surface...adjacent lacustrine soils 27 of the playa lake (i.e., Mesquite Lake) and the outcropping quartz monzonite bedrock of the Bullion Mountains. The Bullion...the geophysical travelled between investigation grids. One target (320) was a no contact, meaning the dig team couldn’t find the particular item

Environmental Assessment. Proposed Sahara Mustard Control on the Barry M. Goldwater Range - East

Science.gov (United States)

2012-02-01

they finally coalesce to form a continuous inclined deposit along a mountain front. Also spelled bahada. Playa A nearly level area at the bottom...sites contain rock cairns without the presence of artifacts. These sites are in a narrow pass and are associated with a travel corridor through this...small playa located in Childs Valley southeast of the Aguila Mountains. 3.8.1.2 Growler Valley Growler Valley lies west of the Growler

Tachymenis chilensis Schegel, 1837 (Reptilia: Squamata: Dipsadidae. New record and geographic distribution map

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Morando, Mariana

2012-05-01

Full Text Available We present the first vouchered record from Chubut provincein Futaleufú Department. Suburbs of Esquel city, along Ruta Nacional 259 to Trevelin on El Pinar, Roberts Farm. This is the southernmost record for the species; to our knowledge the previous southernmost registered specimen was based on collected specimens from Piltriquitrón Mountain in El Bolson, Los Lagos Department, Rio Negro Province.

Distribución espacio-temporal de la meiofauna béntica en cuatro playas del Litoral Norte de la Habana

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Helder Alfonso Pérez

2006-09-01

Full Text Available Con el objetivo de evaluar la distribución espacio-temporal de la meiofauna béntica en la zona sublitoral del norte de la Habana, se realizaron muestreos mensuales en cuatro playas, dos al W de la ciudad (Santa Fe y La Concha y dos al E (Mar Azul y Canasí, desde marzo del 2003 hasta febrero del 2004. Se mantuvo constante la profundidad de muestreo, biotopo y tipo de sedimento, observándose la relación con la salinidad en la columna de agua e intersticial. Para determinar la afinidad entre estaciones se realizó un análisis MDS y para establecer diferencias significativas entre éstas a nivel espacial ó temporal se realizó un análisis de similitud ANOSIM. Las densidades medias más altas se obtuvieron en Santa Fe (7 133. 48 ind/10 cm² y las más bajas en Canasí (892.12 ind/10 cm². Se registraron un total de 13 táxones en todas las áreas estudiadas, siendo los nemátodos de vida libre los organismos dominantes en las estaciones de Santa Fe y Mar Azul, y los copépodos los dominantes en La Concha y Canasí. Se detectaron dos picos de abundancia para los nemátodos y los copépodos durante el período de estudio, así como diferencias significativas entre las estaciones muestreadas, agrupándose así: Santa Fe - La Concha y Mar Azul - Canasí.Temporal spatial distribution of benthic meiofauna in four beaches of the northern Havana shore. The temporal-spatial distribution of benthic meiofauna was evaluated in four beaches at the north coast of Havana, Cuba, from March 2003 to February 2004. We studied two urban beaches (Santa Fe and La Concha and two tourist beaches (Mar Azul and Canasí. Monthly meiofauna samplings were taken by scuba-diving using with a syringe (inner diameter 2.5 cm, and physico-chemical parameters (grain size, interstitial salinity and water column salinity were recorded with standard equipment. Statistical analysis (MDS and ANOSIM were performed. Depth and biotope kind were the same in the four beaches. Highest

Multidecadal trends in the nesting phenology of Pacific and Atlantic leatherback turtles are associated with population demography

OpenAIRE

Robinson, Nathan J.; Valentine, Sara E.; Santidrián Tomillo, Pilar; Saba, Vincent S.; Spotila, James R.; Paladino, Frank V.

2013-01-01

Knowledge of the mechanisms influencing phenology can provide insights into the adaptability of species to climate change. Here, we investigated the factors influencing multidecadal trends in the nesting phenology of the leatherback turtle Dermochelys coriacea at Playa Grande, Costa Rica, in the eastern Pacific Ocean and at Sandy Point, US Virgin Islands, in the western Atlantic Ocean. Between 1993 and 2013, the median nesting date (MND) at Playa Grande occurred later, at a rate of ~0.3 d yr-...

Creech Air Force Base Resort Property in Indian Springs, Nevada. Environmental Baseline Survey Report

Science.gov (United States)

2011-04-01

from the adjacent mountains. The alluvial sediments generally become finer- grained towards the centers of the valleys, where playa lake beds composed...internally drained basins. Following large storms, water may collect within playas , forming shallow lakes that evaporate rapidly due to high rates of...dutance far eoo~~&b away from travelers 011 the road sou.th would retruhmeats, aJ1d the truckers, bau.liog supplies to the Groom dutr1ct miles to

Environmental Assessment (EA) for the Comprehensive Range Plan (CRP), Melrose Air Force Range (AFR), New Mexico

Science.gov (United States)

2011-07-01

intensity, frequency, and duration. Sound is created by acoustic energy, which produces minute pressure waves that travel through a medium (like air...concave plains associated with playa lake basins. Slope ranges from zero to 1 percent. Olton Loams – Consist of very deep, well-drained, moderately slow...gently sloping plains and upper side slopes of playas and draws. Slopes range from zero to 5 percent. 3.5.2.2 Water Resources Surface Water – The most

Estructura de la comunidad de esponjas (Porifera en tres arrecifes del Parque Nacional Morrocoy, Venezuela y su relación con algunas variables ambientales

Directory of Open Access Journals (Sweden)

Marco A. Romero

2013-09-01

Full Text Available El presente estudio pone en evidencia la variación en la estructura de la comunidad de esponjas en tres localidades del Parque Nacional Morrocoy (Cayo Sombrero, Playa Mero y Punta Brava con distintas condiciones ambientales y afectadas diferencialmente por una mortalidad masiva ocurrida en 1996. En un total de 15 transectos de 10m de largo y 1m de ancho en cuatro estratos comprendidos entre 3 y 15m de profundidad en cada localidad; se contabilizaron los individuos por especie para calcular la abundancia relativa, diversidad y equidad. Se analizaron las variables ambientales por localidad y se aprecian diferencias entre ellas con respecto a la corriente, turbidez, y exposición al oleaje. Fueron totalizadas 27 especies; Cayo Sombrero (23, Playa Mero (18 y Punta Brava (15, en la primera localidad domina: Agelas sceptrum, Amphimedon erina y Niphates erecta, en Playa Mero: Niphates erecta y Dysidea etherea y en Punta Brava: Dysidea etherea, Niphates erecta y Amphimedon erina. La composición de especies mostró diferencias estadísticamente significativas entre localidades. La mayor diversidad y equidad correspondió a Cayo Sombrero; donde las condiciones fueron más favorables para el crecimiento de estos organismos, seguido de Playa Mero y Punta Brava, guardando las dos primeras mayor similitud entre sí, según Índice de Sorensen.

Anotrichium furcellatum (Ceramiaceae, Rhodophyta en Argentina: Una posible especie invasora Anotrichium furcellatum (Ceramiaceae, Rhodophyta in Argentina: A possible invasive species

Directory of Open Access Journals (Sweden)

Alicia L. Boraso de Zaixso

2005-12-01

Full Text Available Se reporta la presencia de al menos dos poblaciones de Anotrichium en la costa argentina (provincias de Buenos Aires, Chubut y Santa Cruz. Las poblaciones submareales observadas estaban caracterizadas por una mayoría de talos en estado vegetativo. Solo las poblaciones intermareales mostraron tetrasporofitos con esporangios. Las poblaciones se identificaron provisionalmente de acuerdo a la morfología del talo y de los tetrasporangios como Anotrichium furcellatum (J. Agardh Baldock. Las características de los talos de las poblaciones estudiadas son comparadas con las de las especies de Anotrichium que poseen igualmente pocos tetrasporangios por célula. Se reportan arribazones inusualmente abundantes de esta especie ocurridas en la costa bonaerense en el año 2000.At least two populations of Anotrichium are reported from the coast of Argentina (Buenos Aires, Chubut, and Santa Cruz provinces. These populations have a majority of vegetative thalli. According with their morphological and tetrasporangial characteristics the populations are provisionally assigned to Anotrichium furcellatum (J. Agardh Baldock. The characteristics of the thalli of studied populations are compared with the species of Anotrichium having also a low number of tetrasporangia per cell. Extraordinary high quantities of cast ashore thalli of this species is reported along the Buenos Aires province coast in the year 2000.

Factores ecológicos asociados con la presencia de larvas de Aedes aegypti en zonas de alta infestación del municipio Playa, Ciudad de La Habana, Cuba Ecological factors linked to the presence of Aedes aegypti larvae in highly infested areas of Playa, a municipality belonging to Ciudad de La Habana, Cuba

Directory of Open Access Journals (Sweden)

Juan Andrés Bisset Lazcano

2006-06-01

Full Text Available OBJETIVOS: Identificar los factores ecológicos locales que pudieron incidir en la mayor infestación vectorial con Aedes aegypti observada en cuatro áreas de salud urbanas de Ciudad de La Habana, Cuba, así como los tipos de depósitos con mayor número de larvas. MÉTODOS: Estudio descriptivo en cuatro áreas de salud (Docente, 28 de Enero, 26 de Julio y 1.° de Enero del municipio Playa, Ciudad de La Habana, Cuba, seleccionadas por la presencia reiterada del vector del dengue en el año 2003. Entre abril de 2004 y marzo de 2005 se inspeccionaron todos los locales de las manzanas seleccionadas. Se caracterizaron los depósitos existentes con agua (tipo, cantidad y ubicación y los factores ecológicos observados (existencia de patio y de sombra, forma en que estaban tapados los tanques, presencia de materia orgánica en ellos e higiene de la vivienda. Se contaron las larvas y pupas de mosquitos de cada depósito mediante filtración. La identificación taxonómica de las pupas se realizó con microscopio estereoscópico. RESULTADOS: Los depósitos en que se encontraron larvas y pupas de A. aegypti con mayor frecuencia en todas las áreas fueron los tanques bajos y los pequeños depósitos artificiales. En tres de las áreas estudiadas la mayor cantidad de pupas se encontró en los tanques bajos (88,6%, 100% y 56,6%, de los cuales 90,9% se encontraban destapados o tapados solo parcialmente, mientras que en el área restante los pequeños depósitos artificiales fueron los más frecuentes (85,7%. Se encontró correlación entre el número de depósitos infestados en las viviendas con la presencia de patio (ji2 = 29,59; P = 0,0001, de sombra parcial (ji2 = 4,108; P = 0,0001, de vegetación (ji2 = 43,59; P = 0,0001 y de árboles (ji2 = 101,459; P = 0,0001, así como con la mala higiene (c² = 53,76; P = 0,0001. CONCLUSIÓN: Los depósitos artificiales, especialmente los tanques bajos y los recipientes pequeños, son las criaderos más frecuentes

Conservación de un área protegida con uso recreativo: ¿Se puede lograr que los visitantes dejen menos basura?

OpenAIRE

Cingolani, Ana María; Barberá, Ivan; Renison, Daniel; Barri, Fernando Rafael

2016-01-01

Uno de los problemas de las áreas protegidas en zonas de afluencia masiva es la acumulación de basura abandonada por algunos visitantes. Evaluamos, en playas ribereñas de un área protegida de las sierras de Córdoba, si es posible reducir la basura abandonada por los visitantes utilizando herramientas de la interpretación ambiental. La técnica utilizada consistió en el pedido personalizado al visitante de no dejar basura, acompañado del ejemplo de juntar la basura abandonada en la playa. Reali...

Conservación de un área protegida con uso recreativo: ¿Se puede lograr que los visitantes dejen menos basura?

OpenAIRE

Cingolani, Ana M.; Barberá, Iván; Renison, Daniel; Barri, Fernando R.

2015-01-01

Uno de los problemas de las áreas protegidas en zonas de afluencia masiva es la acumulación de basura abandonada por algunos visitantes. Evaluamos, en playas ribereñas de un área protegida de las sierras de Córdoba, si es posible reducir la basura abandonada por los visitantes utilizando herramientas de la interpretación ambiental. La técnica utilizada consistió en el pedido personalizado al visitante de no dejar basura, acompañado del ejemplo de juntar la basura abandonada en la playa. Reali...

La recaudación del Impuesto al Hospedaje en el Estado de Quintana Roo, México: estadística descriptiva y patrón de tendencia fractal

OpenAIRE

Sergio Lagunas Puls

2014-01-01

Partiendo de la gran importancia que representa la recaudación del Impuesto al Hospedaje en los destinos de sol y playa de México, se establece como objetivo analizar el comportamiento del gravamen en el Estado de Quintana Roo, en donde geográficamente se encuentran Cancún, Cozumel, Playa del Carmen y Tulum, en la Riviera Maya. El trabajo se inicia estableciendo la significación de la recaudación analizada con respecto a los demás ingresos por concepto de impuestos estatales, continuando con ...

Maritime Claims Reference Manual.

Science.gov (United States)

1997-01-01

Melenera to Peninsula de Gando From Peninsula de Gando to Moque Arinaga From Moque Arinaga to Punta Tenefe From Punta Tenefe to Playa Maspalomas (E...From Playa Maspalomas (W) to Punta Taozo From Isla de la Aldea to Punta Sardina From Punta Sardina to Punta Ortiz From Punta Ortiz to Punta...to Cabo Ancones 29° 01.10 13° 27.80 From Punta Lima 28° 55.80 13° 36.87 to Punta del Tarjalillo 28° 35.45 13° 49.25 From Punta de la Entallada 28

Similitud morfológica de espermatozoides de Donax marincovichi y Donax obesulus (Bivalvia: Donacidae)

OpenAIRE

Carstensen, Daniel; Herrmann, Marko; Laudien, Jürgen

2007-01-01

La familia Donacidae se distribuye en playas arenosas de todo el mundo, excepto en regiones Polares. Con un número total de 64, muchas de las especies de esta familia son una fuente valiosa para la pesca artesanal D. marincovichi y D. obesulus habitan playas del norte de Chile hasta el norte de Ecuador, donde desarrollan densas poblaciones. La taxonomía de estas especies es fuente de polémica. La morfología de los espermatozoides es frecuentemente útil para la determinación taxonómica de molu...

Cutaneous larva migrans after a trip to the Caribean

OpenAIRE

García-Fernández, Lisset; Calderón, María

2014-01-01

La larva migrans cutánea es una parasitosis ocasionada por las larvas de Ancylostoma braziliense y Ancylostoma caninum, cuyo vehículo es la arena de playas infestadas. Los perros y gatos son los hospederos definitivos. Esta parasitosis es endémica en las costas del Caribe, África, Australia y Asia. Presentamos el caso clínico de una mujer de 27 años de edad, quien tras haber realizado un viaje al Caribe mexicano y haber estado en contacto con arena de playa, presentó unas lesiones en el pie d...

The economic valuation of the recreational benefits of Dichato Beach (tome-Chlie)

OpenAIRE

Sergio Alonso Orrego; Arcadio Cerda; Felipe Vásquez

1997-01-01

Las condiciones naturales y la infraestructura de servicios existente en la playa de Dichato (VIII Región-Chile), posibilitan la presencia de un considerable número de familias durante las temporadas de verano. Mediante la adecuada aplicación del método del costo de viaje, es posible estimar la demanda recreacional de la playa y sus beneficios económicos. El documento privilegia la modelación del número de viajes efectuados durante un período de tiempo determinado, y en este sentido presenta ...

Survey Report on the Tsunami of the Michoacan, Mexico Earthquake of September 19, 1985

OpenAIRE

Abe, Katsuyuki; Hakuno, Motohiko; Takeuchi, Mikio; Katada, Toshiyuki

1987-01-01

The tsunami was caused by the Michoacan, Mexico earthquake (M. 8.1) of September 19, 1985. According to the site survey, sea water ran up to an elevation of 2 meters or more above sea level in the coastal areas of Mexico from Petatlan to Playa Azul. The tsunami was as high as 4 meters at Barra del Potosi and Playa Linda, where minor tsunami damages occurred; some thatched huts on the beaches were destroyed and pieces of furniture were swept out to sea. The tsunami magnitude Mt is estimated to...

Beach dynamics and nest distribution of the leatherback turtle (Dermochelys coriacea at Grande Riviere Beach,Trinidad &Tobago

Directory of Open Access Journals (Sweden)

Lori Lee Lum

2005-05-01

Full Text Available Grande Riviere Beach in Trinidad and Tobago is an important nesting site in the Caribbean for the Critically Endangered leatherback sea turtle,Dermochelys coriacea .Community members were concerned that beach erosion and seasonal river flooding were destroying many of the nests deposited annually and thought that a hatchery was a possible solution.Over the 2001 turtle nesting season,the Institute of Marine Affairs (IMA assessed the spatial and temporal distribution of nests using the Global Positioning System recorded to reference points,and beach dynamics using permanent bench mark profile stations,to determine areas of high risk and more stable areas for nesting.A total of 1449 leatherback nests were positioned.It was evident that at the start of the season in March,the majority of leatherback nests were deposited at the eastern section of the beach. After May,there was a continuing westward shift in nest distribution as the season progressed until August and beach erosion in the eastern section became predominant.The backshore remained relatively stable along the entire beach throughout the nesting season,and erosion was predominant in the foreshore at the eastern section of the beach,from the middle to the end of the season.Similar trends in accretion and erosion were observed in 2000.River flooding did not occur during the study period or in the previous year.With both high risk and more stable regions for turtle nesting available at Grande Riviere Beach,there was no compelling evidence to justify the need for a hatchery.La playa de Grande Riviere en Trinidad y Tobago es un sitio importante de anidación en el Caribe de la tortuga baula,Dermochelys coriacea ;una tortuga marina en peligro de extinción.Los residentes estaban preocupados de que la erosión de la playa y las inundaciones estacionales estaban destruyendo muchos de los nidos y pensaron que un criadero era una solución.Durante la temporada de anidación del 2001,el Instituto de

Nuevo hospedador de Huequenia livida (Coleoptera: Cerambycidae en Argentina

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José María VILLACIDE

2006-01-01

Full Text Available La presencia de adultos de Huequenia livida (Germain, 1898 (Cerambycidae fue detectada en una plantación de Pinus contorta Douglas ex Loudon var. murrayana (Balf. Engelm. en la localidad de Lago Puelo (Chubut, Argentina. Este es el primer registro del desarrollo de H. livida en una especie hospedadora distinta de Araucaria spp. Esta contribución agrega una nueva especie y una nueva familia al listado de plantas hospedadoras descriptas para este Cerambycidae en Chile.

Nuevo hospedador de Huequenia livida (Coleoptera: Cerambycidae) en Argentina

OpenAIRE

José María VILLACIDE; Paula SACKMANN; Mario ELGUETA

2006-01-01

La presencia de adultos de Huequenia livida (Germain, 1898) (Cerambycidae) fue detectada en una plantación de Pinus contorta Douglas ex Loudon var. murrayana (Balf.) Engelm. en la localidad de Lago Puelo (Chubut, Argentina). Este es el primer registro del desarrollo de H. livida en una especie hospedadora distinta de Araucaria spp. Esta contribución agrega una nueva especie y una nueva familia al listado de plantas hospedadoras descriptas para este Cerambycidae en Chile.

Hydrogeologic framework and occurrence, movement, and chemical characterization of groundwater in Dixie Valley, west-central Nevada

Science.gov (United States)

Huntington, Jena M.; Garcia, C. Amanda; Rosen, Michael R.

2014-01-01

can be several orders of magnitude more transmissive than surrounding and underlying consolidated rocks and Dixie Valley playa deposits. Transmissivity estimates in the basin fill throughout Dixie Valley ranged from 30 to 45,500 feet squared per day; however, a single transmissivity value of 0.1 foot squared per day was estimated for playa deposits. Groundwater generally flows from the mountain range uplands toward the central valley lowlands and eventually discharges near the playa edge. Potentiometric contours east and west of the playa indicate that groundwater is moving eastward from the Stillwater Range and westward from the Clan Alpine Mountains toward the playa. Similarly, groundwater flows from the southern and northern basin boundaries toward the basin center. Subsurface groundwater flow likely enters Dixie Valley from Fairview and Stingaree Valleys in the south and from Jersey and Pleasant Valleys in the north, but groundwater connections through basin-fill deposits were present only across the Fairview and Jersey Valley divides. Annual subsurface inflow from Fairview and Jersey Valleys ranges from 700 to 1,300 acre-feet per year and from 1,800 to 2,300 acre-feet per year, respectively. Groundwater flow between Dixie, Stingaree, and Pleasant Valleys could occur through less transmissive consolidated rocks, but only flow through basin fill was estimated in this study. Groundwater in the playa is distinct from the freshwater, basin-fill aquifer. Groundwater mixing between basin-fill and playa groundwater systems is physically limited by transmissivity contrasts of about four orders of magnitude. Total dissolved solids in playa deposit groundwater are nearly 440 times greater than total dissolved solids in the basin-fill groundwater. These distinctive physical and chemical flow restrictions indicate that groundwater interaction between the basin fill and playa sediments was minimal during this study period (water years 2009–11). Groundwater in Dixie Valley

Presencia simultánea de las fases tetraspororangial y carposporangial sobre el mismo talo en Polysiphonia scopulorum var. villum (Rhodomelaceae, Rhodophyta Mixed phases tetrasporangial and carposporangial on the same thallus in Polysiphonia scopulorum var. villum (Rhodomelaceae, Rhodophyta

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Raúl Aguilar-Rosas

2010-04-01

Full Text Available Se describe por primera vez la presencia simultánea de las fases tetrasporangial (tetrasporangios y carposporangial (cistocarpos sobre el mismo talo en Polysiphonia scopulorum W.H. Harvey var. villum (J. Agardh Hollenberg. El material fue recolectado en la zona intermareal rocosa de Playa Saldamando, Baja California, México, durante octubre de 2004.Mixed tetrasporangial (tetrasporangia and carposporangial (cistocarps phases on the same thallus in Polysiphonia scopulorum W.H. Harvey var. villum (J. Agardh Hollenberg (Rhodomelaceae, Rhodophyta are described for the first time. The material was collected on Octuber, 2004 in the intertidal zone in Playa Saldamando, Baja California, Mexico.

Proyecto inmobiliario de renovación de hotel en Máncora

OpenAIRE

Muñoz Alvarado, Juan Manuel

2015-01-01

El presente estudio analiza la viabilidad para el desarrollo de un proyecto inmobiliario de renovación hotelera en el departamento Piura. El nuevo hotel a desarrollar se edificaría sobre un terreno de 2,116 m2 ubicado en primera frente al mar en la playa Las Pocitas en el distrito de Máncora. Máncora se encuentra localizada a unos 1,200 km al norte de Lima y forma parte de Las Playas del Norte, uno de los destinos turísticos estratégicos del país. Cuenta con un envidiable clima con 300 d...

Análisis del éxito de incubación de la tortuga lora (Lepidochelys olivacea) en función del manejo de los nidos. Península de Osa, Costa Rica

OpenAIRE

Malmierca Pérez, Atenea

2018-01-01

En este trabajo de final de grado se expone un análisis del éxito de incubación (éxito de eclosión y éxito de emergencia) de la tortuga lora (Lepidochelys olivacea) en las playas Carate y La Leona (Península de Osa, Costa Rica), según los diferentes métodos de manejo de nidos realizados (nidos in situ, nidos reubicados en playa y nidos reubicados en el vivero). El objetivo principal de este trabajo es ver si tanto el manejo de los nidos, como la temperatura de la arena y el recubrimiento h...

Nuevo hospedador de Huequenia livida (Coleoptera: Cerambycidae) en Argentina New host record for Huequenia livida (Coleoptera: Cerambycidae) in Argentina

OpenAIRE

José María Villacide; Paula Sackmann; Mario Elgueta

2006-01-01

La presencia de adultos de Huequenia livida (Germain, 1898) (Cerambycidae) fue detectada en una plantación de Pinus contorta Douglas ex Loudon var. murrayana (Balf.) Engelm. en la localidad de Lago Puelo (Chubut, Argentina). Este es el primer registro del desarrollo de H. livida en una especie hospedadora distinta de Araucaria spp. Esta contribución agrega una nueva especie y una nueva familia al listado de plantas hospedadoras descriptas para este Cerambycidae en Chile.Adult of Huequenia liv...

Patrón reproductivo y talla media de madurez sexual de hembras de la langosta Panulirus gracilis (Decapoda: Palinuridae en Playa Lagarto, Guanacaste, Costa Rica

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Helven Naranjo Madrigal

2012-12-01

Full Text Available La langosta Panulirus gracilis es importante como recurso pesquero de las comunidades costeras en el Pacífico Norte de Costa Rica. Debido a la importancia de actualizar el conocimiento relacionado con el patrón reproductivo de esta especie, se analizaron 357 especímenes de langostas P. gracilis hembras capturados mediante el buceo con compresor y el buceo a pulmón durante noviembre de 2007 a octubre del 2008 en Playa Lagarto. Se examinó la composición de las tallas por estrato de profundidad, el patrón mensual de la actividad reproductiva (IAR asociado al aumento relativo de la temperatura superficial del océano, y además se determinó la talla media de madurez sexual utilizando Modelos Lineales Generalizados. Los cuatro estados fisiológicos de madurez sexual mostraron que las hembras sin masa espermatófora y no ovígeras, presentaron las menores tallas con una media de 62.3mm de longitud cefalotoráxica (LC. Se observaron características de madurez sexual a partir de tallas muy bajas que van desde 30 a 50mm de LC, encontrándose la menor hembra ovígera reportada para esta especie de 35.8mm de LC y el mayor porcentaje de hembras maduras entre 70 y 80mm de LC. Los porcentajes del IAR se mantuvieron por encima del 50% durante el año, con excepción de los meses de octubre y enero. Además, se observó un aumento en el IAR que inició a partir de abril y continuó hasta agosto asociado a un relativo aumento en la temperatura a partir del mes de marzo, sin embargo esta relación no fue significativa (r²=0.49, p>0.05. No se descarta que la baja talla media de madurez sexual de 70.2mm de LC para P. gracilis en esta región sea causada por las prácticas de pesca. Se recomienda que se establezca una veda en la región de cinco meses (abril-agosto con el fin de proteger la estacionalidad reproductiva de la especie y promover un mayor reclutamiento a las áreas de pesca.

NESTING HABITAT OF THE ‘CUPISO’ Podocnemis sextuberculata (TESTUDINES: PODOCNEMIDIDAE IN EREPECU LAKE (PARÁ-BRAZIL

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Ana Lucia Bermúdez Romero

2015-05-01

Full Text Available The objective of this study was to identify and describe the nesting habitat of Podocnemis sextuberculata at Erepecu Lake, Trombetas River Biological Reserve, (REBIO-Trombetas; Pará-Brazil. Initially, the main features of the beaches that potentially determine the habitat selection by cupiso for nesting were described. The nests observed on the beaches were recorded, marked and fenced as protection from natural predators. Information regarding date and location was analyzed with simple linear regression for each nest in order to determine relationships between beach features and number of nests. The results showed a positive co-relationship between number of nests and area. Nest site selection by P. sextuberculata in the beaches of the Erepecu Lake could depend on trade-off scenarios among natural threats and a suitable nesting habitat. We also suggest that, due to the high annual hydrologic oscillations on the beaches, it is possible that the driving factor for habitat selection would be the risks that the species is exposed to at the time of the search for a nesting site, rather than seeking a particular habitat type.    RESUMEN El objetivo del estudio fue identificar y explicar la influencia del hábitat sobre los nidos de la tortuga “cupiso” (Podocnemis sextuberculata Cornalia, 1849, en el lago Erepecu ubicado en la Reserva Biológica del Río Trombetas (REBIO-Trombetas; Pará-Brasil. Inicialmente se describieron las principales características de las playas escogidas, los nidos encontrados fueron marcados y cercados para su protección contra la depredación natural. A través de regresiones lineales simples se determinó que el número de nidos por playa se correlacionó significativamente con el “área” de las playas.  Los resultados muestran que la selección del lugar de nidificación en las playas del lago Erepecu por P. sextuberculata, podría depender en unos escenarios de compensación entre las amenazas naturales y un

Calidad del agua de mar y su conocimiento por turistas nacionales: el caso de tres municipios costeros del estado de Nayarit, México.

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Antonio Romualdo Márquez González

2017-01-01

Full Text Available El objetivo de este trabajo es saber si los turistas nacionales conocen la calidad bacteriológica del agua de mar de los sitios que visitaban en los municipios de San Blas, Compostela y Bahía de Banderas del estado de Nayarit. El estar oportunamente informados de los comunicados que emiten las autoridades ambientales y de salud, sobre la calidad del agua de mar de los principales destinos de playa y que podría representar una herramienta de suma importancia para planear el desplazamiento para el disfrute de los destinos de sol y arena, para entrar en contacto con aguas para la recreación y esparcimiento. Se conoce, que su mala calidad podría representar en daños potenciales a la salud de quienes entran en contacto con aguas contaminadas, principalmente con enterococos fecales. En 2013, se aplicó un cuestionario a 283 turistas en las playas más visitadas de dichos municipios y, en donde se lleva a cabo el programa nacional de monitoreo sobre la calidad del agua de mar, además de ser consideradas como playas limpias. El análisis estadístico de correlación mostró aspectos importantes que podrían ser tomados en cuenta por las tres órdenes de gobierno y de los promotores turísticos de la región. Finalmente, el turista al estar informado podría evitar algún tipo de enfermedad, en donde la promoción de playas limpias representaría una mayor afluencia de visitantes y beneficios económicos a la región.

Análisis del sistema defensivo en primera línea en voley playa femenino. [Analysis of the defense system of the net in women’s beach volleyball].

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Gemma María Gea

2013-07-01

Full Text Available La técnica de bloqueo se considera una acción discriminatoria de la victoria en el juego. Por ello, el objetivo principal de este estudio fue analizar las acciones defensivas de primera línea en voley playa femenino. Las principales variables criterio analizadas fueron el sistema de juego defensivo, el nivel de juego exhibido por las parejas participantes y su clasificación. La muestra objeto de estudio estuvo compuesta por 38 jugadoras, divididas en función de su nivel de juego, en 13 parejas con nivel de juego nacional, y 6 con nivel internacional (disputan torneos internacionales representando a España. Fueron analizados 15 partidos, registrándose 1.444 secuencias defensivas completas en primera línea defensiva. Se realizó un estudio de confiabilidad, para determinar el grado de concordancia inter e intraobservadores, llegando a alcanzar una concordancia entre los observadores >.80, lo que avala la calidad de los datos. Los resultados del análisis correlacional mostraron una diferencia en el sistema defensivo utilizado tras el cruce de variables criterio estudiadas, mostrando el test de Chi-cuadrado de Pearson una significación en el cruce (χ² de Pearson AbstractThe defense of the net is considered a discriminatory action of the victory in the game. Therefore, the aim of this study was to analyze the defense of the net actions in women’s beach volleyball. The main variables analyzed were the defensive game system, the game level exhibited by participating couples and their classification in the game. The sample was consisted of 38 players, divided according to their level of play, in 13 couples with national level, and 6 international level (players who compete in internationals tournaments representing Spain. 15 games were analyzed, recording 1.444 complete sequences in defense of the net. A study of confiability was carried out, to determine the degree of agreement inter and intraobservers, reaching to achieve agreement

Occurrence of Hirudinea species in a post urban reach of a Patagonian mountain stream

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M. Laura Miserendino

2014-09-01

Full Text Available Temporal (May 2005 to February 2006 and habitat distribution (pools and riffles of Hirudinea species was analyzed at a post urban reach from Esquel stream (Chubut province, Patagonia, Argentina. Site was located 5.7 km downstream a Waste Treatment Plant. Mean values of nutrients: ammonia, nitrates and soluble reactive phosphate, as well water conductivity, turbidity and total suspended solids indicated physical and organic pollution. Leeches assemblage was composed by the glossiphonids: Helobdella scutifera Blanchard, 1900, H. michaelseni (Blanchard, 1900, H. simplex (Moore, 1911, Helobdella sp., H. hyalina Ringuelet, 1942, H. obscura Ringuelet, 1942 and the semiscolecid Patagoniobdella variabilis (Blanchard, 1900. From these H. hyalina and H. obscura are new records for Chubut province. Helobdella hyalina (810 ind.m-2 and H. simplex (465 ind. m-2 clearly dominated the assemblage at the reach. Only H. simplex displayed a spatial preference being significantly more abundant in pools than in riffle habitats (p<0.001. Species recruitment occurred mostly at September, December and March when juveniles were very abundant. Although several species of Helobdella were able to live in the disturbed section of the stream, only H. simplex and H. hyalina sustained large populations at the site and can be considered as tolerant to organic enrichment. This information is valuable to future studies on stream condition assessment in mountainous areas in Patagonia, and in other areas in which these species are present.

Analysis of admixture and genetic structure of two Native American groups of Southern Argentinean Patagonia.

Science.gov (United States)

Sala, Andrea; Corach, Daniel

2014-03-01

Argentinean Patagonia is inhabited by people that live principally in urban areas and by small isolated groups of individuals that belong to indigenous aboriginal groups; this territory exhibits the lowest population density of the country. Mapuche and Tehuelche (Mapudungun linguistic branch), are the only extant Native American groups that inhabit the Argentinean Patagonian provinces of Río Negro and Chubut. Fifteen autosomal STRs, 17 Y-STRs, mtDNA full length control region sequence and two sets of Y and mtDNA-coding region SNPs were analyzed in a set of 434 unrelated individuals. The sample set included two aboriginal groups, a group of individuals whose family name included Native American linguistic root and urban samples from Chubut, Río Negro and Buenos Aires provinces of Argentina. Specific Y Amerindian haplogroup Q1 was found in 87.5% in Mapuche and 58.82% in Tehuelche, while the Amerindian mtDNA haplogroups were present in all the aboriginal sample contributors investigated. Admixture analysis performed by means of autosomal and Y-STRs showed the highest degree of admixture in individuals carrying Mapuche surnames, followed by urban populations, and finally by isolated Native American populations as less degree of admixture. The study provided novel genetic information about the Mapuche and Tehuelche people and allowed us to establish a genetic correlation among individuals with Mapudungun surnames that demonstrates not only a linguistic but also a genetic relationship to the isolated aboriginal communities, representing a suitable proxy indicator for assessing genealogical background.

Perched aquifers - their potential impact on contaminant transport in the southern High Plains, Texas

International Nuclear Information System (INIS)

Mullican, W.F. III; Fryar, A.E.; Johns, N.D.

1993-01-01

Understanding the hydrogeology and hydrochemistry of perched aquifers at potential and known contaminated waste sites has become increasingly important because of the impact these aquifers may have on contaminant transport independent of regional aquifer processes. Investigations of a perched aquifer above the Ogallala aquifer are being conducted in the region of the U.S. Department of Energy's Pantex Plant, a proposed Superfund site, located approximately 20 mi northeast of Amarillo, Texas. Since the early 1950s, a small playa basin located on the Pantex Plant has been used as a waste-water discharge pond with daily discharge rates ranging from 400,000 to 1 million gal. The focus of this investigation is an unconfined, perched aquifer that overlies a thick silty clay sequence within the upper, mostly unsaturated part of the Ogallala Formation (Neogene). In the area of the Pantex Plant, measured depths to the perched aquifer range from 200 to 300 ft below land surface, whereas depth to the regional Ogallala aquifer ranges from 375 to 500 ft. The potentiometric surface of the perched aquifer typically represents groundwater mounds proximal to the playas and thins into trough in the interplaya areas. Hydrologic gradients of the primary mound under investigation are relatively high, ranging from 28 to 45 ft/mi. Calculated transmissivities have a geometric mean of 54 ft 2 /day, with saturated thicknesses ranging from 4 to 1000 ft. Modeling of the perched aquifer was designed to determine how much, if any, discharge to the small playa basin has enhanced recharge to the perched aquifers and increased the vertical and lateral extent of the perched aquifer. Preliminary results indicate that measurements of vertical conductance through the perching silty-clay sequence and recharge rates through playas are critical for calibrating the model. Accurate delineation of rates and flow directions in the perched aquifer is critical to any successful remediation effort

Preferencias en la anidación de tortugas carey (Eretmochelys imbricata y baulas (Dermochelys coriacea en el Refugio Nacional de Vida Silvestre Gandoca Manzanillo, Limón, Costa Rica

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Lilliana Piedra-Castro

2015-09-01

Full Text Available El Caribe costarricense es importante como sitio de alimentación, copulación, anidación y desove de las tortugas marinas, por lo que el presente trabajo pretendió actualizar el patrón de anidación en las tortugas marinas Dermochelys coriacea y Eretmochelys imbricata en el sector Gandoca, del Refugio Nacional de Vida Silvestre Gandoca Manzanillo, Limón, Costa Rica, para proponer medidas de manejo. Se realizaron recorridos nocturnos entre las 8:00 p. m. y 4:00 a. m., la playa se dividió en cinco sectores, en estos se realizaron observaciones directas y de rastros, de las tortugas que elaboraron el nido, entre febrero y agosto del 2011 y 2012. Se registraron tres especies de tortugas marinas, Dermochelys coriacea, Eretmochelys imbricata y Chelonia mydas. La anidación de tortugas baula tuvo su punto máximo entre marzo y julio; por su parte, las carey, entre mayo y junio (2011, y junio hasta agosto en el 2012. Se observó preferencia en la posición de la playa utilizada para construir sus nidos; la baula utiliza principalmente la parte media, mientras que la carey utilizó mayormente la parte baja para anidar (t = 17.2525. Se observó que la baula utilizó frecuentemente el sector C; sin embargo, no se encontraron diferencias en el uso de los sectores. Se concluye que ambas especies tienen preferencias en la selección de la zona de playa en que anidan; la carey en la parte baja cerca de la línea de costa y la baula en la parte media. Además, las tortugas baula utilizan indistintamente los diferentes sectores de la playa estudiada.

Políticas económicas, financieras e impositivas del gobierno del Chubut y la Municipalidad de Esquel hacia las Pymes de Esquel (Chubut)

OpenAIRE

Colabelli, Diego Emilio

2014-01-01

Las pequeñas y medianas empresas, (Pymes), tienen particular importancia para las economías nacional y regional, no solo por sus aportaciones a la producción y distribución de bienes y servicios, sino también por la flexibilidad de adaptarse a los cambios tecnológicos y el gran potencial de generación de empleos. Representan un excelente medio para impulsar el desarrollo económico y una mejor distribución de la riqueza. Sin embargo, las Pymes tienen algunas dificultades, d...

Procesamiento integral de las especies patagónicas de cangrejos marinos de valor comercial Ovalipes trimaculatus y Platyxanthus patagonicus

OpenAIRE

Dima, Jimena Bernadette

2013-01-01

La industria pesquera de la Provincia de Chubut se ha desarrollado con la captura y el procesamiento de un conjunto tradicional de peces y mariscos. En los últimos años, y como consecuencia de la disminución de los recursos pesqueros tradicionales, ha surgido interés desde el sector por recursos con posibilidades de mercado aún no aprovechadas, tales como, las almejas: Panopea y Navaja (Barón y col, 2004; Lasta y col, 1996), el alga Undaria pinnatifida (Casas y Piritz, 1996) y algunos cangrej...

Diacronía y sincronía del contacto lingüístico en Patagonia sur

OpenAIRE

Virkel, Ana Ester

2012-01-01

Desde su integración al Estado argentino, la región patagónica fue receptora de inmigrantes de muy diversas procedencias, quienes, integrándose con las etnias aborígenes preexistentes, configuraron un contexto multiétnico y multicultural, con la consiguiente diversidad lingüística. El propósito de este trabajo es trazar un esquemático itinerario a través de la historia lingüística de Chubut, Patagonia sur, focalizando el interés en una serie de procesos migratorios que impactan de modo sus...

Repensar la construcción de cartografías sociales: el conflicto como contexto en los procesos de subjetivación política

OpenAIRE

Sabatella, María Emilia

2018-01-01

Este capítulo busca reflexionar acerca de la construcción de relacionalidades históricas (vínculos parentales, vecinales, alianzas políticas) en la definición del espacio social en contextos de lucha a partir de un caso situado: el de las comunidades mapuche Cañio y Ñiripil, asentadas en el cerro León de la Aldea Buenos Aires Chico, provincia de Chubut, Argentina. Desde el año 2010, estas comunidades atraviesan un proceso de conflicto territorial con el municipio y empresarios de la localidad...

Vascular flora of saline lakes in the southern high plains of Texas and eastern New Mexico

Science.gov (United States)

Rosen, David J.; Conway, Warren C.; Haukos, David A.; Caskey, Amber D.

2013-01-01

Saline lakes and freshwater playas form the principal surface hydrological feature of the High Plains of the Southern Great Plains. Saline lakes number less than 50 and historically functioned as discharge wetlands with relatively consistent water availability due to the presence of one or more springs. Currently, less than ten saline lakes contain functional springs. A survey of vascular plants at six saline lakes in the Southern High Plains of northwest Texas and one in eastern New Mexico during May and September 2009 resulted in a checklist of 49 species representing 16 families and 40 genera. The four families with the most species were Asteraceae (12), Amaranthaceae (8), Cyperaceae (5), and Poaceae (12). Non-native species (Bromus catharticus, Poa compressa, Polypogon monspeliensis, Sonchus oleraceus, Kochia scoparia, and Tamarix ramosissima) accounted for 10% of the total species recorded. Whereas nearly 350 species of vascular plants have been identified in playas in the Southern High Plains, saline lakes contain a fraction of this species richness. The Southern High Plains saline lake flora is regionally unique, containing taxa not found in playas, with species composition that is more similar to temperate desert wetlands of the Intermountain Region and Gulf Coastal Plain of North America.

Trabajo femenino en la industria petrolera de Chubut (1919-1962

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Graciela Ciselli

2002-01-01

Full Text Available El artículo compara el trabajo femenino -extradoméstico y doméstico- en dos pueblos de empresas petroleras -la estatal Yacimientos Petrolíferos Fiscales y la privada Astra- ubicadas al norte de Comodoro Rivadavia en la Patagonia Argentina, durante dos épocas: 1919/1945 y 1946/1962. En el primer período se recuperan las formas en que las mujeres aprendieron las tareas femeninas orientadas al trabajo doméstico hogareño. Este aprendizaje les serviría, cuando decidieron o necesitaron, para insertase en el mercado laboral en ocupaciones afines (cocineras, mucamas, lavanderas. En el segundo período, como consecuencia de los cambios sociales, culturales y económicos ocurridos a nivel nacional y local, surgieron para las mujeres nuevas oportunidades en viejas ocupaciones predominantemente masculinas, de las que surgieron v.gr. las telefonistas y enfermeras.

Test strip at the Musters lake area, Chubut province (Argentina)

International Nuclear Information System (INIS)

Lopez, Luis E.

1998-01-01

A local test strip to determine both the system sensitivities and height attenuation coefficients was defined at the Musters Lake area, for its use in airborne spectrometric surveys in the South Patagonia region. The selected calibration range presents both low and uniform radioelement concentration. The mean spectrometer values obtained at ground level were 1.8 % K, 1.6 ppm eU and 7.3 ppm eTh while the variation coefficients were 7.5 %, 27.0 %, and 10.2 %, respectively. These values as well as range dimensions, moisture condition, easy access, easy navigation for aircraft, proximity to a fresh water body and with no flight restrictions are consistent with the international recommendations for setting up a test range. (author)

Test strip at the Musters Lake area, Chubut province (Argentina)

International Nuclear Information System (INIS)

Lopez, Luis E.

1998-01-01

A local test strip to determine both the system sensitivities and height attenuation coefficients was defined at the Musters Lake area, for its use in airborne spectrometric surveys in the South Patagonia region. The selected calibration range presents both low and uniform radioelement concentrations. The mean spectrometer values obtained at ground level were 1.8 % K, 1.6 ppm eU and 7.3 ppm eTh while the variation coefficients were 7.5 %, 27.0 %, and 10.2 %, respectively. These values as well as range dimensions, moisture condition, easy access, easy navigation for aircraft, proximity to a fresh water body and with no flight restrictions are consistent with the international recommendations for setting up a test range. (author)

Salt repository project site study plan for water resources: Revision 1

International Nuclear Information System (INIS)

1987-12-01

The Site Study Plan for Water Resources describes a field program consisting of surface-water and ground-water characterization. The surface-water studies will determine the drainage basin characteristics (i.e., topography, soils, land use), hydrometeorology, runoff to streams and playas, and surface-water quality (i.e., offsite pollution sources in playa lakes and in streams). The environmental ground-water studies will focus on ground-water quality characterization. The site study plan describes for each study the need for the study, study design, data management and use, schedule of proposed activities, and quality assurance. These studies will provide data needed to satisfy requirements contained in, or derived from, the Salt Repository Projects Requirements Document. 78 refs., 8 figs., 5 tabs

76 FR 54796 - Notice of Determinations Regarding Eligibility To Apply for Worker Adjustment Assistance and...

Science.gov (United States)

2011-09-02

... the Andean Trade Preference Act, African Growth and Opportunity Act, or the Caribbean Basin Economic...-80,003; Electronic Arts, Inc., Playa Vista, California: February 15, 2010. TA-W-80,121; Nexergy, Inc...

Lithium- and boron-bearing brines in the Central Andes: exploring hydrofacies on the eastern Puna plateau between 23° and 23°30'S

Science.gov (United States)

Steinmetz, R. L. López

2017-01-01

Internally drained basins of the Andean Plateau are lithium- and boron-bearing systems. The exploration of ionic facies and parental links in a playa lake located in the eastern Puna (23°-23°30'S) was assessed by hydrochemical determinations of residual brines, feed waters and solutions from weathered rocks. Residual brines have been characterized by the Cl- (SO4 =)/Na+ (K+) ratio. Residual brines from the playa lake contain up to 450 mg/l of boron and up to 125 mg/l of lithium, and the Las Burras River supplies the most concentrated boron (20 mg/l) and lithium (3.75 mg/l) inflows of the basin. The hydro-geochemical assessment allowed for the identification of three simultaneous sources of boron: (1) inflow originating from granitic areas of the Aguilar and Tusaquillas ranges; (2) weathering of the Ordovician basement; and (3) boron-rich water from the Las Burras River. Most of the lithium input of the basin is likely generated by present geothermal sources rather than by weathering and leaching of ignimbrites and plutonic rocks. However, XRD analyses of playa lake sediments revealed the presence of lithian micas of clastic origin, including taeniolite and eucriptite. This study is the first to document these rare Li-micas from the Puna basin. Thus, both residual brines and lithian micas contribute to the total Li content in the studied hydrologic system.

Valorización de la naturaleza y disputa por el territorio en la Provincia de Santa Cruz

OpenAIRE

Godoy, Pablo; Fasioli, Enzo; Valiente, Silvia; Schweitzer, Alejandro

2013-01-01

Desde los inicios de la colonización europea, la historia de la Patagonia es la trayectoria de la ocupación para la puesta en valor de la riqueza de sus bienes naturales en el suelo, subsuelo y en su extenso litoral marítimo. Asentados primero en la explotación del ovino, luego del petróleo, el gas y el carbón y recientemente de la pesca, la minería metalífera y el turismo internacional, los territorios de las actuales provincias de Santa Cruz, del Chubut y de Tierra del Fuego, al igual que s...

Lythrum salicaria (Lythraceae), nueva cita para la flora de Argentina

OpenAIRE

Torres, Cristian Daniel; Puntieri, Javier Guido

2016-01-01

Lythrum es un género cosmopolita que incluye unas 36 especies de hierbas anuales y perennes. Lythrum salicaria, una de las especies de más amplia distribución geográfica del género, crece en ambientes riparios en varios países y resulta altamente invasiva fuera de su área de distribución natural. En este trabajo se informa por primera vez la presencia de una población espontánea de L. salicaria en Argentina. Se recolectaron especímenes en la localidad de Las Golondrinas, provincia de Chubut, ...

Dust deposition in southern Nevada and California, 1984-1989: Relations to climate, source area, and source lithology

Science.gov (United States)

Reheis, Marith C.; Kihl, Rolf

1995-05-01

Dust samples collected annually for 5 years from 55 sites in southern Nevada and California provide the first regional source of information on modern rates of dust deposition, grain size, and mineralogical and chemical composition relative to climate and to type and lithology of dust source. The average silt and clay flux (rate of deposition) in southern Nevada and southeastern California ranges from 4.3 to 15.7 g/m2/yr, but in southwestern California the average silt and clay flux is as high as 30 g/m2/yr. The climatic factors that affect dust flux interact with each other and with the factors of source type (playas versus alluvium), source lithology, geographic area, and human disturbance. Average dust flux increases with mean annual temperature but is not correlated to decreases in mean annual precipitation because the regional winds bring dust to relatively wet areas. In contrast, annual dust flux mostly reflects changes in annual precipitation (relative drought) rather than temperature. Although playa and alluvial sources produce about the same amount of dust per unit area, the total volume of dust from the more extensive alluvial sources is much larger. In addition, playa and alluvial sources respond differently to annual changes in precipitation. Most playas produce dust that is richer in soluble salts and carbonate than that from alluvial sources (except carbonate-rich alluvium). Gypsum dust may be produced by the interaction of carbonate dust and anthropogenic or marine sulfates. The dust flux in an arid urbanizing area may be as much as twice that before disturbance but decreases when construction stops. The mineralogic and major-oxide composition of the dust samples indicates that sand and some silt is locally derived and deposited, whereas clay and some silt from different sources can be far-traveled. Dust deposited in the Transverse Ranges of California by the Santa Ana winds appears to be mainly derived from sources to the north and east.

Temporal and vertical variations in phythoplankton community structure and its relation to some morphometric parameters of four Colombian reservoirs Temporal and vertical variations in phythoplankton community structure and its relation to some morphometric parameters of four Colombian reservoirs

Directory of Open Access Journals (Sweden)

Ramírez R. John J.

2000-07-01

Full Text Available Phytoplankton samples were taken at three depths within the photie zone of eaeh of four reservoirs, Punehiná, Las Playas, El Peñol and San Lorenzo loeated in Antioquia department, Colombia. A total of 77 taxa were identified in the four reservoirs. Diatoms were not included. In all reservoirs, Chlorophyta was the dominant group. Botryococcus braunii was the dominant species at Punchiná, Las Playas and El Peñol reservoirs; Cosmarium sp. was the dominant at San Lorenzo. Temporal variation in phytoplankton showed two peaks of abundance, apparently related to precipitation. Taxonomic composition among samples from the same reservoir showed little variation. Community structure at different depths showed significant differences only at San Lorenzo reservoir. The inverse of β-diversity showed small values indicating high similarity among the reservoirs. Diversitv showed no significant assoeiation with any morphometric factor evaluated (area, retention time, altitude and age.Se efectuaron muestreos de fitoplaneton en tres profundidades de la zona fótica de los embalses Punchiná, Las Playas, El Peñol y San Lorenzo, localizados en el departamento de Antioquia, Colombia. Se identificaron un total de 77 taxones en los cuatro embalses. Las diatomeas no fueron incluídas. En todos los casos las Cholorophyta fueron el grupo dominante. Botryococcus braunii fue el taxón de mayor densidad en los embalses Punchiná, Las Playas y El Peñol; y Cosmarium sp. en el embalse San Lorenzo. La comunidad fitoplanctónica mostró dos picos de abundancia aparentemente relacionados con la precipitación. En cada embalse, la composición de taxones entre muestreos varió poco. La estructura de la comunidad a diferentes profundidades mostró diferencias significativas únicamente en el embalse San Lorenzo. El inverso de la β-diversidad presentó valores bajos que muestran la alta similaridad entre embalses. La diversidad no mostró asociación significativa con

Directed natural product biosynthesis gene cluster capture and expression in the model bacterium Bacillus subtilis

KAUST Repository

Li, Yongxin; Li, Zhongrui; Yamanaka, Kazuya; Xu, Ying; Zhang, Weipeng; Vlamakis, Hera; Kolter, Roberto; Moore, Bradley S.; Qian, Pei-Yuan

2015-01-01

validating this direct cloning plug-and-playa approach with surfactin, we genetically interrogated amicoumacin biosynthetic gene cluster from the marine isolate Bacillus subtilis 1779. Its heterologous expression allowed us to explore an unusual maturation

75 FR 66779 - Ruby Lake National Wildlife Refuge, Elko and White Pine Counties, NV; Comprehensive Conservation...

Science.gov (United States)

2010-10-29

... emanating from the base of the Ruby Mountains provide life-sustaining water to the 39,926-acre refuge. The marsh is surrounded by 22,926 acres of meadows, grasslands, alkali playa, and shrub-steppe uplands...

Thermophysical Properties of Martian Duricrust Analogs

Science.gov (United States)

Murphy, N. W.; Jakosky, B. M.; Mellon, M. T.; Budd, D. A.

2009-03-01

We measured thermophysical properties of samples of terrestrial duricrust from a gypsum deposit in New Mexico and Lunar Lake Playa. Our results suggest that well-indurated materials may cover a significant portion of the Mars surface.

Análisis del ataque posicional de balonmano playa masculino y femenino mediante coordenadas polares. [Analysis of positional attack in beach handball male and female with polar coordinates].

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Rafael E. Reigal

2015-07-01

Full Text Available La presente investigación tiene como objetivo aportar una perspectiva novedosa en la comprensión y diferenciación de las conductas de juego en la fase de ataque posicional en el balonmano playa masculino y femenino. Para ello se analizaron 28 partidos de alto nivel con el programa informático Hoisan. Se utilizó un diseño Observacional de carácter nomotético, de seguimiento y multidimensional con un sistema taxonómico metodológicamente validado. Los datos fueron sometidos a un análisis de coordenadas polares en su versión genuina. Para llevar a cabo estos análisis se escogieron siete conductas focales relativas, principalmente, a los jugadores que finalizan el ataque y el modo de realizarlo. Los resultados mostraron diferencias entre las conductas de apareo en la categoría masculina y femenina. Destaca que el ataque posicional en la categoría femenina se orienta hacia zonas de finalización izquierdas ante un sistema defensivo abierto y depende más de la jugadora que adquiere el rol de doble portera (especialista que en la categoría masculina, donde las responsabilidades están más repartidas y el ataque se dirige hacia la banda derecha ante un sistema defensivo cerrado. El lanzamiento en giro se ha mostrado como el principal recurso ofensivo en ambas categorías. Abstract This research aims to provide a new perspective on understanding and differentiation of play behavior in the phase of positional attack in the male and female beach handball. 28 high-level games with Hoisan software were analyzed. The observational design used is nomothetic, monitoring and multidimensional. The taxonomic system has been validated methodologically. Data were subjected to analysis of polar coordinates in its genuine version. To carry out these analyzes on seven focal behaviors were chosen mainly for players who complete the attack and how to create it. The results showed differences in mating behavior in the male and female category. Emphasizes

Geochemical evidence for diversity of dust sources in the southwestern United States

Science.gov (United States)

Reheis, M.C.; Budahn, J.R.; Lamothe, P.J.

2002-01-01

Several potential dust sources, including generic sources of sparsely vegetated alluvium, playa deposits, and anthropogenic emissions, as well as the area around Owens Lake, California, affect the composition of modern dust in the southwestern United States. A comparison of geochemical analyses of modern and old (a few thousand years) dust with samples of potential local sources suggests that dusts reflect four primary sources: (1) alluvial sediments (represented by Hf, K, Rb, Zr, and rare-earth elements, (2) playas, most of which produce calcareous dust (Sr, associated with Ca), (3) the area of Owens (dry) Lake, a human-induced playa (As, Ba, Li, Pb, Sb, and Sr), and (4) anthropogenic and/or volcanic emissions (As, Cr, Ni, and Sb). A comparison of dust and source samples with previous analyses shows that Owens (dry) Lake and mining wastes from the adjacent Cerro Gordo mining district are the primary sources of As, Ba, Li, and Pb in dusts from Owens Valley. Decreases in dust contents of As, Ba, and Sb with distance from Owens Valley suggest that dust from southern Owens Valley is being transported at least 400 km to the east. Samples of old dust that accumulated before European settlement are distinctly lower in As, Ba, and Sb abundances relative to modern dust, likely due to modern transport of dust from Owens Valley. Thus, southern Owens Valley appears to be an important, geochemically distinct, point source for regional dust in the southwestern United States. Copyright ?? 2002 Elsevier Science Ltd.

Groundwater discharge by evapotranspiration, Dixie Valley, west-central Nevada, March 2009-September 2011

Science.gov (United States)

Garcia, C. Amanda; Huntington, Jena M; Buto, Susan G.; Moreo, Michael T.; Smith, J. LaRue; Andraski, Brian J.

2014-01-01

With increasing population growth and land-use change, urban communities in the desert Southwest are progressively looking toward remote basins to supplement existing water supplies. Pending applications by Churchill County for groundwater appropriations from Dixie Valley, Nevada, a primarily undeveloped basin east of the Carson Desert, have prompted a reevaluation of the quantity of naturally discharging groundwater. The objective of this study was to develop a revised, independent estimate of groundwater discharge by evapotranspiration (ETg) from Dixie Valley using a combination of eddy-covariance evapotranspiration (ET) measurements and multispectral satellite imagery. Mean annual ETg was estimated during water years 2010 and 2011 at four eddy-covariance sites. Two sites were in phreatophytic shrubland dominated by greasewood, and two sites were on a playa. Estimates of total ET and ETg were supported with vegetation cover mapping, soil physics considerations, water‑level measurements from wells, and isotopic water sourcing analyses to allow partitioning of ETg into evaporation and transpiration components. Site-based ETg estimates were scaled to the basin level by combining remotely sensed imagery with field reconnaissance. Enhanced vegetation index and brightness temperature data were compared with mapped vegetation cover to partition Dixie Valley into five discharging ET units and compute basin-scale ETg. Evapotranspiration units were defined within a delineated groundwater discharge area and were partitioned as (1) playa lake, (2) playa, (3) sparse shrubland, (4) moderate-to-dense shrubland, and (5) grassland.

Seasonal variations in carbon biomass of bacteria, thraustochytrids and microzooplankton in the northern Arabian Sea

Digital Repository Service at National Institute of Oceanography (India)

Ramaiah, N.; Raghukumar, S.; Gauns, M.; Madhupratap, M.

sup(-1) d sup(-1) below 100 m. In the NAS, heterotrophic bacteria appear to playa significant role in sustaining microzooplankton and the so-called 'Arabian Sea mesozooplankton stable-biomass paradox' through microbial loop. Sizable quantities of Hbac...

Prevalência de lesões labiais em trabalhadores de praia e fatores associados Prevalencia de lesiones labiales en trabajadores de playa y factores asociados Prevalence and factors associated with orolabial lesions in beach workers

Directory of Open Access Journals (Sweden)

Eudes Euler de Souza Lucena

2012-12-01

Full Text Available OBJETIVO: Analisar a prevalência de lesões labiais decorrentes da exposição solar e potenciais associações em trabalhadores de praia. MÉTODOS: Estudo transversal com 362 trabalhadores de cinco praias urbanas em Natal, RN, de agosto a dezembro de 2010. Os participantes responderam um questionário validado com dados pessoais, de ocupação e de saúde e passaram por exame clínico dos lábios feito por pesquisadores calibrados. As possíveis associações das variáveis sociodemográficas, ocupacionais e de saúde geral com a presença de lesões labiais foram avaliadas pelo teste do qui-quadrado para um nível de significância de 5%. A análise multivariada foi feita utilizando-se a regressão robusta de Poisson. RESULTADOS: Dos trabalhadores examinados, 27,1% apresentavam lesões labiais. Desses, 76,8% eram do sexo masculino; 61,6% tinham pele morena ou negra; 94,5% trabalhavam informalmente; e 85,4% trabalhavam expostos ao sol. A maioria (81,1% relatou uso de algum tipo de fotoproteção: protetor solar (38,7%; protetor labial (15,3%; boné/chapéu (72,4%. Aproximadamente 28% eram fumantes e 48% consumiam álcool regularmente. A fotoproteção com uso de boné/chapéu foi associada à presença de lesões labiais decorrentes da exposição solar. CONCLUSÕES: Observou-se alta prevalência de lesões labiais nos indivíduos expostos ao sol, a qual foi associada ao uso de boné/chapéu como forma de fotoproteção.OBJETIVO: Analizar la prevalencia de lesiones labiales productos de la exposición solar y potenciales asociaciones en trabajadores de playa. MÉTODOS: Estudio transversal con 362 trabajadores de cinco playas urbanas en Natal, RN, Brasil, de agosto a diciembre de 2010. Los participantes respondieron un cuestionario validado con datos personales, de ocupación y de salud y se evaluaron a través de exámenes clínicos realizados por investigadores calibrados. Las posibles asociaciones de las variables sociodemogr

Biocenosis de Bivalvia y Polyplacophora del intermareal rocoso en playa Tlacopanocha, Acapulco, Guerrero, México Polyplacophora and Bivalvia biocenosis at rocky intertidal Tlacopanocha beach, Acapulco, Guerrero, Mexico

Directory of Open Access Journals (Sweden)

Lizeth Galeana-Rebolledo

2012-11-01

Full Text Available El Estado de Guerrero, México, tiene regiones marinas prioritarias para la conservación de su biodiversidad y la información acerca de la diversidad de moluscos es escasa, por lo que es necesario realizar inventarios de especies, estudios de ecología de poblaciones y comunidades. Este estudio se efectuó en el intermareal rocoso de la playa Tlacopanocha. Los objetivos fueron: determinar la riqueza, densidad y diversidad de especies; analizar la composición de especies y estructura de tallas. El área de muestreo fue de 10 m² y la unidad de muestreó fue de 1 m². Se identificaron 35 especies, de las cuales tres son nuevos registros para el intermareal rocoso de Guerrero: las familias mejor representadas en riqueza de especies fueron Ischnochitonidae y Arcidae, y en abundancia Chitonidae y Chamidae; la densidad fue de 31,60 ind m-2. Polyplacophora presentó 42,9% de especies dominantes y Bivalvia 19,0%. Chama corallina presentó la mayor talla en longitud y Chama sordida en ancho. La riqueza de especies de moluscos registrada se considera alta y corresponde a lo esperado para un sustrato rocoso en zona tropical. Polyplacophora presentó alta composición de especies, que podría ser resultado de la adaptación de los organismos a las condiciones dinámicas del intermareal rocoso. Los nuevos registros indican la importancia de los inventarios de especies y también del conocimiento de las poblaciones y comunidades de la fauna marina de Guerrero.The State of Guerrero, Mexico, has priority marine areas for conservation of its biodiversity, but information concerning diversity of mollusks is limited, so it is convenient to carry out species inventories, studies of populations and community ecology. This study was conducted in the intertidal rocky beach Tlacopanocha. The objectives were to determine richness, density and species diversity, analyze the species composition and size structure. The sampling area was 10 m² and the sampling unit was

Uranium ore deposits

International Nuclear Information System (INIS)

Angelelli, Victorio.

1984-01-01

The main uranium deposits and occurrences in the Argentine Republic are described, considering, in principle, their geologic setting, the kind of 'model' of the mineralization and its possible origin, and describing the ore species present in each case. The main uraniferous accumulations of the country include the models of 'sandstong type', veintype and impregnation type. There are also other kinds of accumulations, as in calcrete, etc. The main uranium production has been registered in the provinces of Mendoza, Salta, La Rioja, Chubut, Cordoba and San Luis. In each case, the minerals present are mentioned, having been recognized 37 different species all over the country (M.E.L.) [es

Kaolin clays from Patagonia - Argentina. Relationship between the mineralogy and ceramic properties; Arcillas caolinicas de la Patagonia argentina. Relacion entre la mineralogia y las propiedades ceramicas

Energy Technology Data Exchange (ETDEWEB)

Factorovich, J.C.; Badino, D. [Piedra Grande S.A., Buenos Aires (Argentina); Cravero, F.; Dominguez, E. [Universidad Nacional del Sur, Bahia Blanca (Argentina). Dept. de Geologia

1997-12-31

The mineralogy, grain size distribution, chemical composition, S and C contents, plasticity, and cationic exchange capacity are determined in the sedimentary kaolinitic clays from the clay pits Puma Negra, Puma Gris, Tincar Super; and Chenque and Cardenal located in Santa Cruz and Chubut Provinces. Mineralogy and Particle size distribution of > 5, 5-2 and <2{mu} fractions are determined. Modulus of rupture, 1100 and 1250 deg C shrinkage and water absorption and whiteness are found. It is accomplished a statistics correlation between the characteristics of grain size distribution, mineralogy, and other physical properties with the main ceramic properties to understand its influence in the ceramic process. (author) 5 refs., 2 tabs.

Kaolin clays from Patagonia - Argentina. Relationship between the mineralogy and ceramic properties

International Nuclear Information System (INIS)

Factorovich, J.C.; Badino, D.; Cravero, F.; Dominguez, E.

1997-01-01

The mineralogy, grain size distribution, chemical composition, S and C contents, plasticity, and cationic exchange capacity are determined in the sedimentary kaolinitic clays from the clay pits Puma Negra, Puma Gris, Tincar Super; and Chenque and Cardenal located in Santa Cruz and Chubut Provinces. Mineralogy and Particle size distribution of > 5, 5-2 and <2μ fractions are determined. Modulus of rupture, 1100 and 1250 deg C shrinkage and water absorption and whiteness are found. It is accomplished a statistics correlation between the characteristics of grain size distribution, mineralogy, and other physical properties with the main ceramic properties to understand its influence in the ceramic process. (author)

Nrf2 Expression Modifies Influenza A Entry and Replication inNasal Epithelial Cells

Science.gov (United States)

Influenza infection is a major cause of morbidity and mortality worldwide, especially during pandemics outbreaks. Emerging data indicate that phase II antioxidant enzyme pathways could playa role in virus-associated inflammation and immune clearance. While Nrf2-dependent gene exp...

Prevalence of Toxocara spp. eggs in soil of public areas in Iran: A ...

African Journals Online (AJOL)

Bahman Maleki

2017-07-29

Jul 29, 2017 ... ria, Nepal, Indonesia, Brazil and Peru.38 Regarding to presence of. Toxocara species .... Contaminación por parásitos caninos de importancia · zoonótica en playas de la ciudad de Corrientes, Argentina. Parasitol latinoam.

Determinación de la secuencia de precipitación salina en la laguna de La Playa (Zaragoza, España. 1. Condiciones de equilibrio mineral y simulación teórica del proceso

Directory of Open Access Journals (Sweden)

Gómez, J.

1999-04-01

Full Text Available Neutral brines of the Na-Cl type from La Playa saline system reach extremely high concentrations (up to ionic strengths of 10 molal during the evaporative process. Ionic activities and mineral saturation indices in waters sampled along their evaporative path are calculated by PHRQPITZ code to study their geochemical evolution. Saturation states calculated by the code have pointed out that al! brines sampled were saturated with respect to calcite, gypsum and anhydrite. However, their stability diagram shows that water activity values determine gypsum to be the more stable phase in the Ca-S04-H20 system for almost all samples. Halite, thenardite and bloedite reach saturation at a late stage during brine evolution. The evolving paths of mirabilite, glauberite, polyhalite and epsomite do not show any evidence of brine-mineral equilibrium process along evaporative evolution. Nevertheless, mirabilite saturation state should be taken with caution because of the lack of field temperature data. Calculations carried out at 15° C shows that mirabilite is affected by reequilibrium processes which take place at short temporal scales (daily fluctuations of temperature. The comparison of these results with those of Garcés et al. (1991, 1992 indicates that Pitzer' s formulation is the more adequate approach for the physicochemical treatment of highly concentrated waters. Theoretical simulation of evaporation process has been carried out using the most diluted sample like starting point. Open system in relation to gaseous exchange between brine and atmosphere, and constant temperature (25° C have been considered like boundary conditions along the calculations. Simulation results have faithfully reproduced the evolving path defined by means of physicochemical treatment of brine samples. This supports the previously posed hypothesis in relation to the sequence of mineral precipitation that should take place in the saline system. Moreover, this fact suggests

Edificio Playa, en la Costa del Sol

Directory of Open Access Journals (Sweden)

Cassinello, Fernando

1964-02-01

Full Text Available This apartment block has been built on the Costa del Sol, in Almeria, only a few metres from the seashore. It is meant to provide the following facilities. Changing rooms for bathers, and a night club, in the basement. Restaurant and bar on the ground floor. Twelve living apartments on the six standard floor levels; two apartments per storey. Porter's house in the attic. As the foundations are in the sand, and the building is exposed to strong coastal winds, the structural design has, as interesting features, the foundation ribbed slab and the transversal portal frames, which are W shaped on the ground level. This arrangement makes the edifice look lighter and it acquires a more dynamic plasticity.En la Costa del Sol de Almería y a muy pocos metros de la orilla del mar, se ha construido este edificio de apartamentos. Su programa es el siguiente: casetas de baño y sala de fiestas, en sótano; restaurante-bar, en planta baja; doce viviendas, en las seis plantas tipo, con dos viviendas por planta; y vivienda del portero en ático. Cimentado sobre arena y expuesto a los fuertes vientos que azotan la costa, la solución estructural ofrece el interés de su tipo de cimentación por placa nervada, y de sus pórticos transversales que en planta baja adoptan forma de W, con lo que el edificio adquiere un aspecto de mayor ligereza y de dinamismo plástico.

Aspectos biometricos del bagre Arius Furthii Steindachner (Pisces Ariidae, colectado en punta Morales, Golfo de Nicoya, Costa Rica

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Maurizio Protti Quesada

2016-03-01

Full Text Available Se analizan estadísticamente algunos parámetros biométricos de 257 ejemplares de Arius furthii (Ariidae, colectados en una zona de playa y otra de manglar en Punta Morales, Puntarenas, Costa Rica. Las colectas se realizaron por medio de “arrastres” con una red tipo “chinchorro”. La talla de los especímenes capturados osciló entre 55 y 276 mm de longitud total y 1,3 a 176 g en peso fresco. El análisis estadístico mostró que la longitud total es la mejor variable para la estimación del peso fresco a través de una ecuación de regresión logarítmica.  Además, se mostró que no existen diferencias significativas en el peso de los Arius furthii colectados en la playa y los colectados en el manglar.

The logical structure of mathematical physics

CERN Document Server

Sneed, Joseph D

1971-01-01

This book is about scientific theories of a particular kind - theories of mathematical physics. Examples of such theories are classical and relativis­ tic particle mechanics, classical electrodynamics, classical thermodynamics, statistical mechanics, hydrodynamics, and quantum mechanics. Roughly, these are theories in which a certain mathematical structure is employed to make statements about some fragment of the world. Most of the book is simply an elaboration of this rough characterization of theories of mathematical physics. It is argued that each theory of mathematical physics has associated with it a certain characteristic mathematical struc­ ture. This structure may be used in a variety of ways to make empirical claims about putative applications of the theory. Typically - though not necessarily - the way this structure is used in making such claims requires that certain elements in the structure play essentially different roles. Some playa "theoretical" role; others playa "non-theoretical" role. For ...

Estudio y clasificación de la materia orgánica dispersa (MOD en el Lías de la Playa de Peñarrubia (Asturias

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González Prado, J. J.

1990-04-01

Full Text Available A study of the organic matter of a marine sequence of the west part from Peñarrubia Beach (Asturias has been carried out using pyrolysis tests and petrographic and geochemical techniques. White light and fluorescence microscopic observations have permitted to establish a general classification of the disperse organic matter, its distribution and concentration along the series, and also the variation with the litology. The organic components have been classified into nine groups which are mainly found in the Upper part of the Pliensbachian marlaceous and lutitic beds. These bituminous leveis are composed of a kerogen type 11 or mixed, with a small contribution of terrestrial humic materials. The rank of DOM has been determined by huminite reflectance and Rock-Eval (Tmax, being both results concordant. The DOM is in an inmature stage before the oil generation window. The highest oil yields determined by pyrolysis tests at 500°C correspond to the richest DOM levels. Petrographic and geochemical data show a good correlation. AIgae, fibers, organic-mineral matrix and other submicroscopic associations are the main source for oil generation.En el presente trabajo se estudia por técnicas petrográficas y mediante ensayos de pirólisis o técnicas geoquímicas la serie marina del borde Oeste de la Playa de Peñarrubia (Asturias para conocer la naturaleza de su parte orgánica. Las observaciones microscópicas en luz blanca y por fluorescencia han permitido establecer una clasificación general de la materia orgánica dispersa, su distribución y concentración a lo largo de toda la serie y según las diferentes litologías. Se han clasificado los componentes orgánicos en 9 grupos mayoritarios que se concentran, principalmente en los niveles margosos y lutíticos del Pliensbachiense, habiéndose delimitado niveles bituminosos en la parte superior de la serie. Estos están constituidos por un kerógeno de tipo 11 mixto formado por un material aut

Inestabilidad del desarrollo en estructuras craneofaciales de poblaciones humanas sudamericanas

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Lotto, Federico P.

2013-12-01

Full Text Available Diversos factores genéticos y ambientales pueden actuar sobre los mecanismos que amortiguan el efecto de perturbaciones aleatorias durante el desarrollo, resultando en un aumento de la inestabilidad del desarrollo (ID y de la variación a nivel individual. El objetivo de este trabajo es analizar el grado y el patrón de asimetría fluctuante (AF en el cráneo, como una medida de ID, en poblaciones con distinto tipo de subsistencia. Asimismo, se evalúa la existencia de diferencias entre la base, la bóveda y el esqueleto facial. Se relevaron landmarks tridimensionales sagitales y bilaterales en 109 cráneos de Chubut, San Juan y SO de Pampa. El método de Superposición Procrustes Generalizado fue usado para extraer los componentes simétrico y asimétrico de la forma. Los análisis preliminares indicaron que el error de medición y la asimetría direccional dan cuenta de un porcentaje reducido de la variación total, mientras que la AF explica entre el 10 y el 15% de la misma. La magnitud de AF –estimada como la distancia Procrustes entre las configuraciones originales y sus imágenes reflejadas– de la bóveda y la región facial resultó mayor en San Juan, mientras que la base no presentó diferencias entre las muestras. Los patrones de forma del componente asimétrico indican que la muestra de Chubut se diferencia en la base y la cara, mientras que la de San Juan se diferencia en la bóveda. En resumen, los resultados obtenidos sugieren variación modular en la ID del cráneo y diferencias entre las muestras analizadas.

Uranium deposit types and resources of Argentina

International Nuclear Information System (INIS)

Lopez, L.; Cuney, M.

2014-01-01

The uranium-related activities in Argentina begun in the 1950s and, as a result of the systematic exploration, several types of deposits have been discovered since then: volcanic and caldera-related, sandstone-hosted, vein spatially related to granite (intragranitic and perigranitic) and surficial. The deposits that have been the focus of the most important uranium exploitations are the ones that belong to the volcaniclastic type. These are localized in Permian formations associated with synsedimentary acid volcanism in the Sierra Pintada district (Mendoza province). The volcanic and caldera related type is also present in the Laguna Colorada deposit (Chubut province) located in the San Jorge basin (Cretaceous). Several important uranium mineralisations have been identified in Cretaceous fluvial sandstones and conglomerates, among which the most relevant is the Cerro Solo deposit (Chubut province) that corresponds to the paleochannel structure subtype. Other subtypes of sandstone model have been studied. For instance, the Don Otto deposit (Salta province), located in the Salta Group Basin (Cretaceous - Tertiary), belongs to the tabular U-V subtype. The roll front subtype can be also found in the Los Mogotes Colorados deposit (La Rioja province) which is hosted by Carboniferous continental sandstones. The uranium mineralisations in veins and disseminated episyenites within peraluminous leucogranites of the Sierras Pampeanas (Cordoba and San Luis provinces) represent other types of existing deposits. These granites are Devonian – Carboniferous and the related deposits are comparable to those from the Middle European Variscan. There are also other vein-type uranium deposits located in metamorphic basement in the periphery of high potassium calcalkaline granites (Sierras Pampeanas of Catamarca and La Rioja provinces), where the mineralisation control is mainly structural. The current uranium identified resources of the country are approximately 24,000 tU in the

Getting water right: A case study in water yield modelling based on precipitation data.

Science.gov (United States)

Pessacg, Natalia; Flaherty, Silvia; Brandizi, Laura; Solman, Silvina; Pascual, Miguel

2015-12-15

Water yield is a key ecosystem service in river basins and especially in dry regions around the World. In this study we carry out a modelling analysis of water yields in the Chubut River basin, located in one of the driest districts of Patagonia, Argentina. We focus on the uncertainty around precipitation data, a driver of paramount importance for water yield. The objectives of this study are to: i) explore the spatial and numeric differences among six widely used global precipitation datasets for this region, ii) test them against data from independent ground stations, and iii) explore the effects of precipitation data uncertainty on simulations of water yield. The simulations were performed using the ecosystem services model InVEST (Integrated Valuation of Ecosystem Services and Tradeoffs) with each of the six different precipitation datasets as input. Our results show marked differences among datasets for the Chubut watershed region, both in the magnitude of precipitations and their spatial arrangement. Five of the precipitation databases overestimate the precipitation over the basin by 50% or more, particularly over the more humid western range. Meanwhile, the remaining dataset (Tropical Rainfall Measuring Mission - TRMM), based on satellite measurements, adjusts well to the observed rainfall in different stations throughout the watershed and provides a better representation of the precipitation gradient characteristic of the rain shadow of the Andes. The observed differences among datasets in the representation of the rainfall gradient translate into large differences in water yield simulations. Errors in precipitation of +30% (-30%) amplify to water yield errors ranging from 50 to 150% (-45 to -60%) in some sub-basins. These results highlight the importance of assessing uncertainties in main input data when quantifying and mapping ecosystem services with biophysical models and cautions about the undisputed use of global environmental datasets. Copyright �

Cerezo: desarrollo de un cultivo no tradicional en Argentina

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Scarpati, Olga

2011-12-01

Full Text Available The incorporation of non-traditional crops for Argentine Republic became notable in the late XX century and early XXI by technological innovations that allow very significant yields, the opportunity represented by the exportation of agricultural products, as is the case of cherry, favoured by the exchange rate, and against seasonality of production for consumer markets in the Northern Hemisphere. The main cherry-growing areas are three: the Uco Valley in Mendoza province, the Los Antiguos Valley in the province of Santa Cruz and the Lower Valley of the Chubut River (VIRCH in the province of same name, which met the requirements for achieving good crop yields. The main destination of this nectarine is in addition to domestic consumption, exports to the US and the European Union (EU, representing an important trade surplus for producing areas.

La incorporación de cultivos que no son tradicionales para la República Argentina se hizo notable a fines del siglo XX y principios del XXI por las innovaciones tecnológicas que permiten rindes muy significativos, la oportunidad que representa la exportación de algunos productos agropecuarios como es el caso de la cereza favorecidos por el tipo de cambio, y la contraestacionalidad de la producción, respecto de los mercados consumidores del hemisferio norte. Las principales zonas de cultivo de cerezo son tres: el Valle de Uco en la provincia de Mendoza, el Valle Los Antiguos en la provincia de Santa Cruz y el Valle inferior del río Chubut (VIRCH, en la provincia homónima; las cuales cumplen con los requisitos para lograr buenas producciones del cultivo. El principal destino de esta fruta es además del consumo interno, la exportación a EEUU y la Unión Europea (UE, representando un saldo comercial importante para las zonas productoras.

Marcadores ancestrales culturales y genéticos: investigación de apellidos mapuche

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Corach, Daniel

2007-01-01

Full Text Available Las comunidades aborígenes que habitan las regiones andinas se caracterizan por haber conservado elementos lingüísticos originarios en sus apellidos. Estos han sufrido procesos de “occidentalización”, manteniendo, no obstante, rasgos etnia-específicos. Tal situación permite disponer de un criterio simple para identificar con cierto grado de certeza la ancestralidad de un individuo. Con el objeto de evaluar el grado de correlación entre este marcador cultural y marcadores genéticos hemos llevado a cabo una investigación con individuos varones no relacionados provenientes de las provincias de Río Negro y Chubut (N=136. Los donantes se seleccionaron de acuerdo a la presencia de elementos lingüísticos Mapuche en sus apellidos e individuos con apellidos europeos. Se emplearon tres criterios de clasificación: apellidos, presencia del haplogrupo Q-M3 y presencia de Haplogrupos mitocondriales amerindios (ABCD. Los grupos clasificados de acuerdo con estos criterios fueron analizados mediante 15 STRs autosómicos y 9 Y-STRs. En ambas provincias más del 95% de los individuos portadores de apellidos Mapuche exhibían hgs matri y/o patrilineales amerindios. Por otro lado, en Río Negro y Chubut sólo 18 y 17%, respectivamente, no exhibieron ni apellidos ni marcadores genéticos asociables con ancestros amerindios; en éstos los hgmt más representados fueron H (6.5%, U5 (4.3% y K (2.8%, seguidos por T (1.4%, V (0.7%, X (0.7% y M (0.7%. También fue detectado el hg Africano en baja frecuencia (1.4%. Nuestros resultados confirman una correlación estrecha entre apellidos Mapuche y polimorfismos genéticos étnia-específicos.

The effect of physical and chemical parameters on the macroinfaunal community structure of San Vicente bay, Chile Efectos de parámetros físicos y químicos en la estructura comunitaria de la macroinfauna en la bahía de San Vicente, Chile

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ROCÍO A. SIEMENS

2001-06-01

(RTR beach morphodynamic parameter. There was also a significant linear relationship between E. analoga and 1/slope parameter. Although there was a significant correlation between the physical parameters of the beach and E. analoga distribution, these results should not be taken as conclusive for we must not exclude other possible factors, including chemical ones, which were not measured in this study. Absence of the amphipod Orchestoidea tuberculata Nicolet at the high water mark in the industrial zone can be explained by destruction of habitat due to direct human disturbanceLa bahía de San Vicente, situada en la zona central de Chile, está altamente industrializada y posee una playa arenosa que se extiende desde un área de uso recreativo a otra de uso industrial, en la que se vierten residuos líquidos. El estudio de la macroinfauna de la zona intermareal mostró una distribución heterogenea de la misma. Un máximo de cinco especies de invertebrados fue hallado en sólo 1 de 6 transectos muestreados a lo largo de la playa. La densidad varió de 0 a 188 individuos m-2, alcanzándose los valores más altos en la zona recreativa y los más bajos en la zona industrializada. La especie más abundante, Emerita analoga (Stimpson, fue elegida para estudiar la posible respuesta de la macrofauna frente a las variables de morfodinámica de la playa, a los parametros fisicoquímicos y a la concentración de metales pesados en el sedimento. E. analoga mostró su más alta densidad en la zona recreativa de la playa, al nivel medio-bajo del intermareal. La densidad de E. analoga a lo largo de la playa estuvo correlacionada significativamente con los valores de pH, temperatura (ºC, salinidad (‰ y concentraciones de oxígeno (ml O2 l -1 en el agua intersticial. Sin embargo, la concentración de oxígeno tuvo un mínimo de 3 ml O2 l -1 en la zona baja intermareal más cercana al area recreativa donde se contó el mayor número de individuos de macroinfauna. El análisis de 12

Journal of Earth System Science | Indian Academy of Sciences

Indian Academy of Sciences (India)

A hydrological simulation of the water regime in two playa lakes located in southern Spain ... Response of bankfull discharge of the Inner Mongolia Yellow River to flow .... Forest cover change prediction using hybrid methodology of geoinformatics .... of deep-sea manganese nodules from the Central Indian Ocean Basin.

33 CFR 328.3 - Definitions.

Science.gov (United States)

2010-07-01

... neighboring. Wetlands separated from other waters of the United States by man-made dikes or barriers, natural... streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural... characteristics such as clear, natural line impressed on the bank, shelving, changes in the character of soil...

Internal parasites of free-ranging guanacos from Patagonia.

Science.gov (United States)

Beldomenico, P M; Uhart, M; Bono, M F; Marull, C; Baldi, R; Peralta, J L

2003-12-01

In the winter of 2000, a greater than 80% reduction in the guanaco population located in Cabo Dos Bahi;as Wildlife Reserve, Chubut, Argentina, was evident due to massive mortality attributed to starvation. Twelve guanacos were necropsied and samples were analyzed at the Parasitology Laboratory of Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral. Fecal analysis revealed developmental stages of Nematodirus sp., Marshallagia sp., Trichuris sp. and Eimeria spp. Histopathological analysis showed the presence of Sarcocystis sp. in muscle and fascia cysts. Other parasites recovered included Dictyocaulus filaria, Trichuris tenuis and Moniezia expansa. Of these, D. filaria and M. expansa possibly reflect interactions with domestic sheep. This is the first time that T. tenuis has been reported in guanacos.

[Social enterprises in mental health: the narratives of their protagonists].

Science.gov (United States)

2011-01-01

This paper aims to share the experience carried on in the Social Enterprises which are part of the Mental Health System of the state of Chubut (Argentina) since 2009. First, the context of the founding of the social enterprises inside a program which involves the government and the civil society in line with the state policies is presented, taking labour as a paradigm of psychosocial rehabilitation of people with mental suffering in effective interaction with other people from the community. Then, testimonies of entrepreneurs, as well as their definition of the enterprise and their personal experiences when participating in it are presented. Finally, the future challenges of this type of practice is summarised.

Las Cucharas y Leticia: dos sitios arqueológicos tardíos en el Canal del Dique. Avance de investigación

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Diana Rocío Carvajal Contreras

2013-01-01

Full Text Available La información de este artículo provino del proyecto de investigación en curso “Evaluación Zooarqueológica de concheros cercanos al Canal del Dique, Fase Inicial”. Se procedió a la ubicación de los puntos identificados por Macchi en 1998, registrando dos sitios con materiales posteriores al Formativo: las Cucharas y Leticia. Las evidencias se asociaron a fechas entre los siglos XIII a XIX. Uno de ellos tal vez esté relacionado con las actividades de reapertura del Canal bajo la dirección de G.M. Totten. Por otro lado, los taxones de moluscos indicaron que las personas que habitaban en los sitios arqueológicos, principalmente Leticia, se desenvolvían en un ambiente costero con diversos hábitats de playa arenosas, playas fangosas, manglar, zonas rocosas y de alta energía, zonas intermareales o hábitats de arena-cascajo, fondo mixto, pradera de pastos, y pradera de macroalga.

75 FR 35770 - Notice of Intent To Prepare a Draft Environmental Impact Statement/Environment Impact Report...

Science.gov (United States)

2010-06-23

... Project size at total build-out is currently expected to be approximately 2,400 acres, which may be..., productive aquatic community. --Provide suitable water quality for fish. --Minimize adverse effects to desert..., operations, and maintenance, and also the beneficial impact on fugitive dust from covering exposed playa with...

LanDPro: Landscape Dynamics Program

Science.gov (United States)

2012-09-18

geomorphic evolution and Quaternary geology in a complex bedrock setting in a region of high tectonic activity as well as the presence of a system of playa ...of the archaeological record of travel , Yuma Proving Ground, Arizona. Technical Report 05-103, prepared for U.S. Army Yuma Proving Ground

El mundo del libro : noviembre de 1968

Directory of Open Access Journals (Sweden)

Agustín Rodríguez Garavito

1968-11-01

Full Text Available Se presentan las siguientes reseñas: -Los trabajos y los días en Menéndez Pidal. -Playas de oro: poesía de Humberto Archila. -Siervos de Dios y amor de indios de Víctor Daniel Bonilla. -Relectura de Giovani Papini, obras completas.

Translating Culture in Bilingual Dictionaries | Kotze | Lexikos

African Journals Online (AJOL)

In addition to the act of translation, transculturalisation and strategies of textuality come into playas interacting factors in the compilation of interlingual dictionaries. In this article, some conclusions resulting from a comparative survey of some South African dictionaries are drawn, specifically with regard to bi- and trilingual ...

A network model framework for prioritizing wetland conservation in the Great Plains

Science.gov (United States)

Albanese, Gene; Haukos, David A.

2017-01-01

ContextPlaya wetlands are the primary habitat for numerous wetland-dependent species in the Southern Great Plains of North America. Plant and wildlife populations that inhabit these wetlands are reciprocally linked through the dispersal of individuals, propagules and ultimately genes among local populations.ObjectiveTo develop and implement a framework using network models for conceptualizing, representing and analyzing potential biological flows among 48,981 spatially discrete playa wetlands in the Southern Great Plains.MethodsWe examined changes in connectivity patterns and assessed the relative importance of wetlands to maintaining these patterns by targeting wetlands for removal based on network centrality metrics weighted by estimates of habitat quality and probability of inundation.ResultsWe identified several distinct, broad-scale sub networks and phase transitions among playa wetlands in the Southern Plains. In particular, for organisms that can disperse >2 km a dense and expansive wetland sub network emerges in the Southern High Plains. This network was characterized by localized, densely connected wetland clusters at link distances (h) >2 km but <5 km and was most sensitive to changes in wetland availability (p) and configuration when h = 4 km, and p = 0.2–0.4. It transitioned to a single, large connected wetland system at broader spatial scales even when the proportion of inundated wetland was relatively low (p = 0.2).ConclusionsOur findings suggest that redundancy in the potential for broad and fine-scale movements insulates this system from damage and facilitates system-wide connectivity among populations with different dispersal capacities.

Sedimentology, geochemistry and rock magnetic properties of beach sands in Galapagos Islands - implications for nesting marine turtles

Science.gov (United States)

Perez-Cruz, L.; Urrutia-Fucugauchi, J.; Vazquez-Gutierrez, F.; Carranza-Edwards, A.

2007-12-01

Marine turtles are well known for their navigation ability in the open ocean and fidelity to nesting beaches. Green turtle adult females migrate from foraging areas to island nesting beaches, traveling hundreds or thousands of kilometers each way. The marine turtle breeding in the Galapagos Islands is the Green Sea Turtle (Chelonia mydas agassisi); fairly common throughout the islands but with nesting sites located at Las Bachas (Santa Cruz), Barahona and Quinta Playa (Isabela), Salinas (Baltra), Gardner Bay (Española) and Bartolomé Islet. In order to characterize and to identify the geochemical signature of nesting marine turtle beaches in Galapagos Islands, sedimentological, geochemical and rock magnetic parameters are used. A total of one hundred and twenty sand samples were collected in four beaches to relate compositional characteristics between equivalent areas, these are: Las Bachas, Salinas, Barahona and Quinta Playa. Grain size is evaluated using laser particle analysis (Model Coulter LS 230). Bulk ICP-MS geochemical analysis is performed, following trace elements are analyzed: Al, V, Cr, Co, Ni, Cu, Zn, Cd, Ba, Pb, Fe, Mn, K, Na, Mg, Sr, Ca and Hg; and low-field magnetic susceptibility is measured in all samples at low and high frequencies. Granulometric analysis showed that Barahona and Quinta Playa are characterized for fine grained sands. In contrast, Salinas and Las Bachas exhibit medium to coarse sands. Trace metals concentrations and magnetic susceptibility show different distribution patterns in the beach sands. Calcium is the most abundant element in the samples. In particular, Co, K, and Na show similar concentrations in the four beaches. Las Bachas beach shows highest concentrations of Pb and Hg (maximum values 101.1 and 118.5 mg/kg, respectively), we suggest that the enrichment corresponds to an anthropogenic signal. Salinas beach samples show high concentrations of Fe, V, Cr, Zn, Mn and the highest values of magnetic susceptibility (maximum

Medium-term shoreline evolution of the mediterranean coast of Andalusia (SW Spain)

Science.gov (United States)

Liguori, Vincenzo; Manno, Giorgio; Messina, Enrica; Anfuso, Giorgio; Suffo, Miguel

2015-04-01

Coastal environment is a dynamic system in which numerous natural processes are continuously actuating and interacting among them. As a result, geomorphologic, physical and biological characteristics of coastal environments are constantly changing. Such dynamic balance is nowadays seriously threatened by the strong and increasing anthropic pressure that favors erosion processes, and the associated loss of environmental, ecologic and economic aspects. Sandy beaches are the most vulnerable environments in coastal areas. The aim of this work was to reconstruct the historical evolution of the Mediterranean coastline of Andalusia, Spain. The investigated area is about 500 km in length and includes the provinces of Cadiz, Malaga, Granada and Almeria. It is essentially composed by cliffed sectors with sand and gravel pocket beaches constituting independent morphological cells of different dimensions. This study was based on the analysis of aerial photos and satellite images covering a period of 55 years, between 1956 and 2011. Aerial photos were scanned and geo-referenced in order to solve scale and distortion problems. The shoreline was considered and mapped through the identification of the wet / dry sand limit which coincides with the line of maximum run-up; this indicator - representing the shoreline at the moment of the photo - is the most easily identifiable and representative one in microtidal coastal environments. Since shoreline position is linked to beach profile characteristics and to waves, tide and wind conditions at the moment of the photo, such parameters were taken into account in the calculation of shoreline position and changes. Specifically, retreat/accretion changes were reconstructed applying the DSAS method (Digital Shoreline Analysis System) proposed by the US Geological Survey. Significant beach accretion was observed at Playa La Mamola (Granada), with +1 m/y, because the construction of five breakwaters, and at Playa El Cantal (Almeria) and close

Poema: Mithistorema

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Jorge Seferis

1966-08-01

Full Text Available Hemos esperado al mensajero tres años, vigilando los pinos, la playa las estrellas. Nos uníamos al hierro del arado o a la quilla del navío para tratar de descubrir el Primer gérmen y que el drama muy antiguo recomenzara.

Paramilitary Organizations in Germany from 1871-1945

Science.gov (United States)

2014-03-01

After Röhm’s release from prison in April 1924, he traveled through the country to resurrect SA units. Röhm structured his revived paramilitary...These factors are once more in playas of this writing in 2014 in such places as Greece, Hungary, Ukraine and Russia, and collide with an extraordinary

Widely-Tunable Parametric Short-Wave Infrared Transmitter for CO2 Trace Detection (POSTPRINT)

Science.gov (United States)

2013-01-01

coefficient in nonlinear fiber by distant low-power FWM,” IEEE Photonics Society Summer Topical Meeting, paper WC1.1, Playa Del Carmen, Mexico (2010... traveling -wave construction (i.e. they are cavity-less), they circumvent all the impairments #140287 - $15.00 USD Received 3 Jan 2011; revised 16 Mar

La evolución del turismo en España: el ejemplo de Benidorm (Alicante)

OpenAIRE

Espinosa Seguí, Ana

2013-01-01

La historia del turismo de sol y playa masivo en España puede ser analizada teniendo en cuenta el caso de la ciudad de Benidorm. En esta presentación se va a realizar un breve recorrido evolutivo por esta ciudad alicantina, capital turística de la Costa Blanca.

Influence of riverine outputs on sandy beaches of Higuerote, central coast of Venezuela Influencia de aportes fluviales en playas arenosas de Higuerote, costa central de Venezuela

Directory of Open Access Journals (Sweden)

Antonio Herrera

2011-01-01

Full Text Available The influence of riverine outputs from the Tuy River on the coastal processes of near sandy beaches was assessed by measuring the physical and chemical characteristics of water and sediment samples at eight sites along the north central Venezuelan coast and from the rivers that flow through this región into the sea (Tuy, Capaya, Curiepe during two field surveys. In addition, the behavior of the Tuy River discharge plume was evaluated using remote sensors, and its effect on the population abundance and size structure of the clam Tivela mactroides was determined. Of the three rivers evaluated, the Tuy River had the highest impact on the coastal zone (789.15 ± 190.63 km² in terms of flow rate (246.39 m³ s-1, nutrients (659.61 ± 503.27 g s-1total nitrogen; 52 ± 53.09 g s-1 total phosphorus and sedimentary material (9320.84 ± 9728.15 g s-1. The variables measured (salinity, total nitrogen and phosphorus, pH, turbidity, and total organic carbon showed a spatial gradient along the coast. Tivela mactroides had the highest biomass and density (9126.8 ± 1562 g m-2; 9222.22 ± 1976.72 ind m-2 at the sites farthest from the river mouths and smaller sizes (Para evaluar los aportes del río Tuy sobre los procesos costeros en playas arenosas cercanas, se examinó en dos campañas de muestreo, las características físicas y químicas a nivel de agua y sedimento en ocho estaciones ubicadas a lo largo de la costa centro norte de Venezuela, el cauce de los ríos que allí desembocan (Tuy, Capaya, Curiepe, además del comportamiento de la pluma del río Tuy mediante sensores remotos y su influencia sobre las poblaciones de la almeja Tivela mactroides en cuanto a abundancia y estructura de talla. El río Tuy tuvo mayor predominio sobre la zona costera (789,15 ± 190,63 km , presentó el mayor aporte líquido (246,39 m³ s-1, de nutrientes (659,61 ± 503,27 g s-1 nitrógeno total; 52 ± 53,09 g s-1fósforo total y material sedimentario (9320,84 ± 9728,15 g

The Coast Artillery Journal. Volume 75, Number 5, September-October 1932

Science.gov (United States)

1932-10-01

demurrage charges Would be made. that our cars would be spotted at points previously specified by us, and that, at no COsto the government, the Railroad...mentioned before, would playa sensible part due to the great accuracy of the listening device system. This error is due to the wind. The wind not only

Stratigraphy of neoproterozoic sedimentary and volcano sedimentary successions of Uruguay

International Nuclear Information System (INIS)

Pecoits, E.; Aubet, N.; Oyhantcabal, P.; Sanchez Bettucci, L.

2004-01-01

Based on the new data the different characteristics of the Neoproterozoic (volcano) sedimentary succesions of Uruguay are described and discussed. Their stratigraphic tectonics and palaeoclimatic implications are analyzed.The results of the present investigations also allow to define the Maldonado Group which would beintegrated by the Playa Hermosa and Las Ventanas formations.

Sir Gilbert Thomas Walker

Indian Academy of Sciences (India)

playa fundamental role in the variability of the earth's climate. Walker noted a tendency of ... Walker was however not able to ascertain the physical mechanism governing these oscillations. In the first two ... In 1927, he made the follow- ing prophetic statement: "There is, to-day, always a risk that specialists in two subjects,.

Effect of thermal ammoniation and heat treatment on the faecal and ...

African Journals Online (AJOL)

tannin (1,13 ± 0,38% with a range of 0,29 - 1,94%; ..... to heat, may also playa role in the ... may also be a result of the small decrease ..... 1969). These linkages do not limit the adverse effect to only the involved amino acids, but also to the avail ...

Parque eólico offshore playas de Vera

OpenAIRE

Morales Sánchez, Daniel

2016-01-01

Propiamente la redacción de este proyecto tiene como objeto los siguientes puntos: • La descripción de las obras e instalaciones necesarias para llevar a cabo la construcción del Parque Eólico Offshore Vera. • Servir de soporte técnico para la obtención de la Autorización Administrativa y la Aprobación del Proyecto de construcción y la puesta en marcha del Parque Eólico Offshore Vera. • Dicho proyecto será extremadamente respetuoso con el entorno, cumpliendo en todo momento con la D...

Coste de la limpieza “cotidiana” de playas

OpenAIRE

Patricio, Poullet; Juan J., Muñoz-Perez; Gregorio, Gomez-Pina; Angel, de la Casa; Jorge, Roman-Sierra; Marina, Navarro Pons

2015-01-01

Más de 90.000 buques mercantes al año cruzan el Estrecho de Gibraltar de los que aproximadamente un 5% son petroleros. Ello, conjuntamente con la existencia de varios puertos con refinerías y polígonos industriales petroquímicos y la práctica del bunkering para aprovisionamiento de combustible, hace a la costa gaditana un punto de riesgo para la contaminación por hidrocarburos (Carmona et al., 2009). La Demarcación de Costas de Andalucía-Atlántico (DCAA), dependiente del Ministerio de Agricul...

Eupsophus calcaratus (Anura, Leptodactilydae: ampliación de su distribución geográfica y hábitats en Argentina

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Úbeda, Carmen A.

2000-03-01

Full Text Available Argentina, Provincia de Chubut, Departamento de Futaleufú: 1 Parque Nacional Los Alerces, margen NE del Lago Menéndez, proximidad desembocadura Arroyo Zanjón Hondo, (42°42' S, 71°41' O, 520 m snm, 14/febrero/1997. Un ejemplar macho adulto, colector: Carmen A. MACN 37034. 2 Parque Nacional Los Alerces, Arroyo Torrecillas, Lago Menéndez, 18/enero/1972. Colector: Monaglio. MACN 29946. 3 Parque Nacional Los Alerces, Lago Futalaufquen, 25/abril/1969. Colector: Foerster. CENAI 7163. 4 Parque Nacional Los Alerces, margen norte del Lago 1 [actualmente parte del Lago Amutui Quimei], (43°01' S, 71°46' O, 1-2/1971. Colectores: Monadio, Garrido y Bianchini. MACN 29723/28.

[Importance of studying the balance of vaginal content (BAVACO) in the preventive control of sex workers].

Science.gov (United States)

Bologno, Romina; Díaz, Yanina M; Giraudo, María C; Fernández, Rosa; Menéndez, Viviana; Brizuela, Juan C; Gallardo, Adriana A; Alvarez, Laura A; Estevao Belchior, Silvia G

2011-01-01

The aim of this work was to study the vaginal microenvironment in sex workers from Comodoro Rivadavia, Chubut. For that purpose, BAVACO procedures were applied. A total of 229 female sex workers attended public health centers. Vaginal secretions were analyzed by Gram and Giemsa stains. The following results were obtained: normal microbiota 35.37 %, intermediate microbiota 15.72 %, bacterial vaginosis 23.14 %, microbial non-specific vaginitis, Donders'"aerobic vaginitis" 10.48 %, yeast vulvovaginitis 8.30 %, and trichomoniasis 6.99 %. The intermediate microbiota was characterized by a decrease in the number of lactobacilli and the presence of diphtheroid bacilli cell types. The population studied shared increased values of vaginal dysfunctions. These results are considered risk factors for obstetric and gynecologic diseases.

A revised geographical range for Liolaemus elongates Koslowsky, 1896 (Squamata: Liolaemini in Argentina: review of reported and new-data based distribution with new localities

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Ignacio Minoli

2013-12-01

Full Text Available Estimating the effective geographical ranges of species is central to species-oriented conservation and management. In this paper, we review the geographical distribution of Liolaemus elongatus Koslowsky, 1896 with three new records for northern Chubut and southern Río Negro provinces, Argentina. Based on detailed locality records pooled from multiple data sources, including new records obtained for this study, we revise the range of L. elongatus sensu stricto and provide geographical distribution maps comparing the previously recognized range to that proposed herein. Our results show that L. elongatus possesses a much more limited geographic distribution than previously thought, being restricted to areas south of 38°S latitude; the newly proposed range is merely half the species formerly recognized geographical distribution.

Una nueva ultraestructura de ópalo CT en silcretas. Posible indicador de influencia bacteriana

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Bustillo, Mª A.

1995-04-01

Full Text Available Electron microscope observations of opaline silcretes found in the playa of a Miocene shallow lake reveal new opal CT microstructures. These microstructures are made up of fibres, filaments or rods, which are formed, in tum by coalesced microspheres or microhemispheres (0,1-0,2 µ diameter. They are up to 10 µ in length although larger ones could exist. They are straight, bent, wavy or even hairpin shaped. These microstructures comprise part of the opaline mass of the silcretes and are very similar to both neogenic opaline structures which are formed by bacterial intluence and to silicified biofilms. Therefore microbial mediation could exist in the genesis of this opal CT, although a possible inorganic origin by silicification of sepiolite is also considered.Un estudio mediante MEB de silcretas miocenas opalinas formadas por silicificación de playas en un ambiente de «playa-lake» pone de manifiesto la existencia de una nueva microestructura de ópalo CT. Esta microestructura denominada en general fibrosa, se manifiesta por la presencia de multitud de fibras, filamentos o varillas formadas por la alineación de microesferas o microhemisferas que presentan un diámetro entre 0,1 y 0,2 µ. Las fibras, filamentos o varillas tienen formas variables: rectas, curvadas, onduladas y «en horquilla», y presentan longitudes de hasta 10 µ, aunque podrían existir longitudes mayores. La disposición organizada de las microesferas en filamentos o fibras, constituyendo la masa general del ópalo, y su parecido con microestructuras opalinas que han sido formadas por influencia bacteriana, hacen considerar esta hipótesis, aunque no se puede descartar totalmente un origen inorgánico por silicificación de sepiolita.

Studies of geology and hydrology in the Basin and Range province, southwestern United States, for isolation of high-level radioactive waste: characterization of the Sonoran region, California

International Nuclear Information System (INIS)

Bedinger, M.S.; Sargent, Kenneth A.; Langer, William H.

1989-01-01

The Sonoran region of California lies west of the Colorado River and adjoins the Mojave Desert on the west, Death Valley on the northwest, and the Salton trough on the south. The region is arid with annual precipitation ranging from less than 80 millimeters to as great as 250 millimeters in one mountain range; annual free-surface evaporation is as great as 2,500 millimeters. The characteristic basin and range topography of the region was caused by a mid-Tertiary period of intense crustal extension, accompanied by volcanic eruptions, clastic sedimentation, faulting, and tilting. Potential host media for isolation of high-level radioactive waste include granite and other coarsegrained plutonic rocks, ash-flow tuff, and basalt and basaltic andesite lava flows. Thick sections of the unsaturated zone in basin fill, intrusive, and volcanic rocks appear to have potential as host media. The region is bordered on the west by areas of relatively greater Quaternary faulting, vertical crustal uplift, and seismicity. The region has a few areas of Quaternary volcanic activity. Geothermal heat flows of 2.5 heat-flow units or greater and one earthquake of magnitude 6-7 have been recorded. The region includes topographically closed basins as well as basins that drain to the Colorado River. Dry lakes and playas occupy the closed basins. Ground-water recharge and surface runoff are small because of the small amount of precipitation and great potential evaporation. Natural ground-water discharge is by evaporation in the basin playas and by underflow to the Colorado River. Dissolved-solids concentration of ground water generally is less than 500 milligrams per liter, and much of it is of the sodium bicarbonate type. Ground water is saline in many of the playas, and chloride or sulfate is the predominant anion. Small tonnages of ore have been produced from numerous precious and fewer base-metal deposits. (author)

GLAUBERITE-HALITE ASSOCIATION IN BOZKIR FORMATION (PLİOCENE, ÇANKIRI-ÇORUM BASİN, CENTRAL ANATOLİA, TURKEY

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İLHAN SÖNMEZ

2015-06-01

Full Text Available Tertiary Çankırı – Çorum Basin is one of the biggest basin covering evaporitic formationsin the Central Anatolia. During borehole drills carried out in Bozkır Formation whichcontain Pliocene aged evaporites in the basin, a thick rocksalt (halite, NaCl deposit wasdetected that consisting of glauberite (Na2Ca(SO42 interlayers (sabhka synchronouswith sedimentation. Rocksalt bearing layers in Bozkır formation which was deposited inplaya-lake – sabhka environment, where seasonal changes are effective, were first definedas Tuz member in this study. Bozkır formation was divided into three zones in drillingscarried out in sabhka – playa -lake transitional environment. From bottom to top, these areordered as claystone-less anhydrite zone, rock salt-claystone-anhydrite-glauberite zone(Tuz member and claystone-gypsum-less anhydrite zone. Rocksalt was cut in thicknessesreaching 115 meters within Tuz member. Rocksalt (playa-lake which is mostly bedded andwhite, pale/dark gray colored is conformable with sedimentation and is low dipping. The1. Girifl

Preliminary description of quaternary and late pliocene surficial deposits at Yucca Mountain and vicinity, Nye County, Nevada

International Nuclear Information System (INIS)

Hoover, D.L.

1989-01-01

The Yucca Mountain area, in the south-central part of the Great Basin, is in the drainage basin of the Amargosa River. The mountain consists of several fault blocks of volcanic rocks that are typical of the Basin and Range province. Yucca Mountain is dissected by steep-sided valleys of consequent drainage systems that are tributary on the east side to Fortymile Wash and on the west side to an unnamed wash that drains Crater Flat. Most of the major washes near Yucca Mountain are not integrated with the Amargosa River, but have distributary channels on the piedmont above the river. Landforms in the Yucca Mountain area include rock pediments, ballenas, alluvial pediments, alluvial fans, stream terraces, and playas. Early Holocene and older alluvial fan deposits have been smoothed by pedimentation. The semiconical shape of alluvial fans is apparent at the junction of tributaries with major washes and where washes cross fault and terrace scarps. Playas are present in the eastern and southern ends of the Amargosa Desert. 39 refs., 9 figs., 1 tab

GRÁFICOS DE CONTROL MULTIVARIANTES PARA EL SEGUIMIENTO DE LA CONTAMINACIÓN LITORAL

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Pedro Fuentes Durá

2003-04-01

Full Text Available

La costa este de España sufre periódicamente episodios de proliferación masiva de algas, que provocan graves perjuicios para los sectores turístico y pesquero, e incluso suponen un riesgo sanitario para la población. Este trabajo muestra un método que permite la detección de variaciones significativas en el estado del ecosistema, como cambios en las concentraciones de nutrientes y densidad de fitoplancton. Se expone el uso de gráficos de control estadístico de procesos basados en componentes principales (PC de las variables que se miden regularmente en estas playas. Los PC encontrados facilitan la interpretación de las razones por las que se producen estos episodios. Por otra parte, los gráficos de control propuestos tienen la capacidad de detectar situaciones anómalas que favorecen las proliferaciones masivas, permitiendo un eficaz control medioambiental en estas playas.

Education as Free Use: Giorgio Agamben on Studious Play, Toys, and the Inoperative Schoolhouse

Science.gov (United States)

Lewis, Tyson E.

2014-01-01

In this essay, I argue that the work of Giorgio Agamben provides us with a theory of studious play which cuts across many of the categories that polarize educational thought. Rather than either ritualized testing or constructivist playfulness, Agamben provides a model of what he refers to as studious play--a practice which suspends the logic of…

The Education of the Active Televiewer of School Age.

Science.gov (United States)

Munoz, Patricio Calderon; Torres, Miguel Reyes

In response to a series of problem symptoms related to the influence of television on students, a team of professors at the Universidad de Playa Ancha de Ciencias de la Educacion in Chile undertook a project designed to train television viewers to become critical viewers of the medium. Specific objectives of the project included: (1) to design a…

Chapter 2. Borderlands environment, past and present

Science.gov (United States)

Guadalupe Sanchez de Carpenter; A.C. MacWilliams

2006-01-01

The major mountain ranges in the study area today were produced by Middle Miocene and younger extensional faulting. Faulting continued into the late Pleistocene as evidenced by fault scarps along the margins of the Animas, Hachita, and Playas Valleys. These long-term geologic events resulted in the present basin and range physiography of the Malpai Borderlands, as...

Chapter 3. Malpai Borderlands prehistory

Science.gov (United States)

Paul R. Fish; Suzanne K. Fish

2006-01-01

Systematic archaeology in the Malpai Borderlands begins with D. D. Gaillard's (1896) map of the elevated Cloverdale Playa beachline in the San Luis Valley. During his involvement with the U.S.-Mexico International Border Survey, Gailard was drawn to this feature by local ranchers' reports of a massive Native American dam. Familiar with the scale of...

Reptiles of Chubut province, Argentina: richness, diversity, conservation status and geographic distribution maps

Science.gov (United States)

Minoli, Ignacio; Morando, Mariana; Avila, Luciano Javier

2015-01-01

Abstract An accurate estimation of species and population geographic ranges is essential for species-focused studies and conservation and management plans. Knowledge of the geographic distributions of reptiles from Patagonian Argentina is in general limited and dispersed over manuscripts from a wide variety of topics. We completed an extensive review of reptile species of central Patagonia (Argentina) based on information from a wide variety of sources. We compiled and checked geographic distribution records from published literature and museum records, including extensive new data from the LJAMM-CNP (CENPAT-CONICET) herpetological collection. Our results show that there are 52 taxa recorded for this region and the highest species richness was seen in the families Liolaemidae and Dipsadidae with 31 and 10 species, respectively. The Patagónica was the phytogeographic province most diverse in species and Phymaturus was the genus of conservation concern most strongly associated with it. We present a detailed species list with geographical information, richness species, diversity analyses with comparisons across phytogeographical provinces, conservation status, taxonomic comments and distribution maps for all of these taxa. PMID:25931966

Characterization of leveling problems of Patagonia gamma-ray spectrometry survey, Chubut province (Argentina)

International Nuclear Information System (INIS)

Ford, Kenneth L.; Lopez, Luis E.

1998-01-01

Measuring the radioelement concentrations of the soils along traverses perpendicular to the flight line direction was performed in order to gather useful information in support of the leveling of the airborne gamma-ray spectrometer survey of Patagonia. Two sites were selected as test areas which ground and airborne spectrometric data were systematically compared to asses the nature of the leveling problems. It is suspected that variations in soil moisture may play a significant roll in the leveling variations. (author)

Acceso a la vivienda, derechos de territorio Housing access and territorial rights

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Lucrecia Petit

2011-12-01

Full Text Available El presente trabajo se propone estudiar las condiciones actuales del acceso a la vivienda en sectores sociales marginalizados y algunos de los efectos psicosociales sobre la población afectada, a través del análisis de dos casos específicos que los autores han investigado en profundidad: una cooperativa autogestiva de vivienda en la ciudad de Buenos Aires, y una comunidad aborigen en la provincia de Chubut. Se introduce la problemática a partir de la consideración de dos casos que cobraron notoriedad mediática durante el año 2010, y se discuten algunos aportes conceptuales en torno a las nociones de territorio y de organización en la comunidad. A partir del análisis de estos casos, se desprende por un lado la gravedad de los atropellos cometidos contra el derecho a la vivienda de las clases bajas y de las comunidades indígenas, así como también la capacidad de resistencia que las mismas poseen mediante su incipiente organización.This paper aims to studying the current conditions of access to housing in marginalized social sectors and some of the psychosocial effects on the affected population, through the analysis of two specific cases that the authors have investigated in depth: a self-managed housing cooperative in the city of Buenos Aires, and an aboriginal community in the province of Chubut. The problem is introduced through the consideration of two cases that gained mediatic notoriety in 2010, and some conceptual contributions around the notions of territory and community organization are discussed. From the analysis of these cases, it is concluded on the one hand the severity of the abuses committed against the housing rights of the lower classes and indigenous communities, as well as the resilience potential that they possess through their growing organization.

Análisis del gradiente edáfico en la región Andinopatagónica Analysis of soil gradient in Andean Patagonia Region

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Juan José Gaitán

2007-07-01

Full Text Available Se analizaron las relaciones entre la ubicación geográfica, precipitación media anual y nueve variables edáficas de 95 perfiles de suelos de origen volcánico distribuidos a lo largo de la región Andina de las provincias de Neuquén, Río Negro y Chubut. Con las variables edáficas correspondientes a dos profundidades (0-20 cm y 30-60 cm se realizó un análisis de cluster que permitió agrupar a los perfiles en cinco grupos principales. Se realizó un análisis de componentes principales y se observó que los grupos se diferenciaron a lo largo del eje 1. Este eje se relaciona con la longitud. Desde los suelos de régimen xérico de estepa ubicados en el este de la región hacia los suelos de régimen údico de bosque ubicados en el oeste, se incrementa el pH (NaF, la concentración de carbono orgánico y la capacidad de retención hídrica y disminuye, el pH (H2O, el pH (KCl y la densidad aparente.The relationships among location, mean annual precipitation and nine edaphic variables were studied for 95 profiles of volcanic soils throughout the Andean Region of the provinces of Neuquen, Rio Negro and Chubut. A cluster analysis conducted with the edaphic variables at two depths (0-20 cm and 30-60 cm indicated five main groups. Principal component analysis (PCA allowed to differentiate the groups for the axis 1. This axis was positively related to longitude, indicating an increase of pH (NaF, organic C and water retention capacity, and a decrease of pH (H2O, pH (KCl and bulk density from the xeric steppe soils at east to the udic forest soils at west.

Distribución geográfica, historia natural y conservación del hurón menor Galictis cuja (Carnivora: Mustelidae en la Patagonia central, Argentina Geographic distribution, natural history and conservation of the lesser grison Galictis cuja (Carnivora: Mustelidae from Central Patagonia, Argentina

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Marcelo Carrera

2012-12-01

Full Text Available El hurón menor, Galictis cuja, tiene una amplia distribución en el territorio patagónico extraandino, aunque sus registros puntuales son escasos. Este trabajo se desarrolló en la provincia del Chubut, Patagonia Central, Argentina. Aquí se aportan nuevas localidades de registro de G. cuja para esta región; se discuten aspectos de su distribución geográfica y conservación en el Área Natural Protegida Península Valdés (ANP-PV; Patrimonio Natural de la Humanidad y brevemente se explora la representación de G. cuja en los ensambles de carnívoros del ANP-PV desde el Holoceno tardío hasta la actualidad. Se adicionaron 18 nuevos registros de G. cuja en Patagonia central. Se detectó un conflicto entre los pobladores y hurones, que motiva la caza de estos últimos. Se verificó un aparente incremento de abundancia de G. cuja en los últimos miles de años, concomitante con la extinción regional o dramática disminución de Lyncodon patagonicus (Carnivora, Mustelidae.The Lesser Grison, Galictis cuja, is a species widely distributed in extra-Andean Patagonia, although its records are scarce. This work was carried out in Chubut province, Central Patagonia, Argentina. Here we report new occurrence localities of G. cuja for this region; we discuss aspects of their geographical distribution and conservation in the Área Natural Protegida Península Valdés (ANP-PV; World Heritage Site and briefly explores the representation of G. cuja in carnivore assemblages of ANP-PV, since the late Holocene to the present. We added 18 new records of G. cuja in Central Patagonia. We detected a conflict between the rural residents and the Lesser Grison, which motivates the hunting of the latter. There was an apparent increase in abundance of G. cuja in the last thousands of years, concomitant with regional extinction or dramatic reduction of Lyncodon patagonicus (Carnivora, Mustelidae.

Population regulation in Magellanic penguins: what determines changes in colony size?

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Luciana M Pozzi

Full Text Available Seabirds are often studied at individual colonies, but the confounding effects of emigration and mortality processes in open populations may lead to inappropriate conclusions on the mechanisms underlying population changes. Magellanic penguin (Spheniscus magellanicus colonies of variable population sizes are distributed along the Argentine coastline. In recent decades, several population and distributional changes have occurred, with some colonies declining and others newly established or increasing. We integrated data of eight colonies scattered along ∼600 km in Northern Patagonia (from 41°26´S, 65°01´W to 45°11´S, 66°30´W, Rio Negro and Chubut provinces and conducted analysis in terms of their growth rates, production of young and of the dependence of those vital rates on colony age, size, and location. We contrasted population trends estimated from abundance data with those derived from population modeling to understand if observed growth rates were attainable under closed population scenarios. Population trends were inversely related to colony size, suggesting a density dependent growth pattern. All colonies located in the north--which were established during the last decades--increased at high rates, with the smallest, recently established colonies growing at the fastest rate. In central-southern Chubut, where colonies are the oldest, the largest breeding aggregations declined, but smaller colonies remained relatively stable. Results provided strong evidence that dispersal played a major role in driving local trends. Breeding success was higher in northern colonies, likely mediated by favorable oceanographic conditions. However, mean foraging distance and body condition of chicks at fledging were influenced by colony size. Recruitment of penguins in the northern area may have been triggered by a combination of density dependence, likely exacerbated by less favorable oceanographic conditions in the southern sector. Our results

Telón de fondo: Paisajes de desierto y alteridad en la fotografía de la Patagonia (1880-1900 Backdrop: Desert and Alterity Landscapes in the Photography of Patagonia (1880-1900

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Carlos Masotta

2009-12-01

Full Text Available El paisaje patagónico construido por la fotografía del período 1880-1900 fue un marco en donde se llevó a cabo el ingreso civilizatorio. Luego de una caracterización general del problema (el paisaje desierto como «escenificación de ausencia» en torno a los primeros álbumes de Estado sobre la región, centro el análisis de este artículo en dos obras que describieron el Territorio de Chubut: Viaje a la Patagonia Austral (1886 del Coronel Luis Fontana y la Excursión a la Patagonia y a los Andes de Aarón Anchorena (1902. Entre ellas puede observarse la articulación de una mirada militar y civil donde el paisaje fotográfico del desierto se involucra en la toma material y simbólica del territorio como un escenario donde se «naturaliza» la actuación de un ingreso civilizatorio y la desaparición de los pueblos indígenas.The Patagonian landscape built up by photography during the 1880-1900 periods was the framework in which the civilizing entrance took action. After a general description of the problem (the deserted landscape as the staging of absence about the first State's albums on the region, I focus the analysis on two works describing the Territory of Chubut: Viaje a la Patagonia Austral (Trip to Southern Patagonia by Coronel Luis Fontana (1886 and Excursion a la Patagonia y a los Andes (Tour to Patagonia and the Andes, de Aaron Anchorena (1902. The articulation of a military and civil glance can be observed between them, where the photographic landscape of the desert is involved in the material and symbolic shot of the territory as a stage where the acting of a civilizing entrance and the disappearance of the indigenous peoples is naturalized.

Peopling of Northern Argentinean Patagonia during Late Holocene: paleoenvironments and social imperatives

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María Teresa BOSCHÍN

2012-03-01

Full Text Available In this paper, the role of central plateaus –dated at ca. 3500 AP– in the peopling of the southern end of America that started at around ca. 13000 AP, is discussed. A revision and updating of the archaeological and paleoclimatic evidences and their absolute chronologies were made. To Mid Holocene, the space that we defined as the periphery of central plateaus –Atlantic coast, Colorado, Limay and Chubut rivers– was conformed. During Late Holocene, the inland sites were characterized by a progresively increase in the density of archaeological remains, with dense occupations towards upper levels or the final settlement stage on the Plateaus. An inland Norpatagonia peopling model is proposed, based on which of the peripheral population loci could provoke exploratory and migratory movements, and paleoenvironmental and social explanations are considered.

Area Handbook Series: Cuba; a Country Study,

Science.gov (United States)

1986-01-01

xix Chapter 1. Historical Setting. ...................................... Elizabeth de Lima ...Guane Rio Santo L F AntonClarao -22 % Fei ienfuegos Moron kNulvo Gerona Playa Sancti 11-,Giron Spirntu Jhoi ~~ ~Trinidad Cg a Tunas de Zaza * National...schol- arly literature. xi Country Profile 0 0l Country _ Formal Name: Cuba (Rep6blica de Cuba). Short Form: Cuba. Term for Citizens: Cubans. Capital

Remote Sensing of the Propagation Environment (La Teledetection du Milieu de Propagation)

Science.gov (United States)

1992-02-01

ef 6,71 (1) the polarization characteristics are expresed in Stokes parameters. which have the dimension of intensity.A = 2nB .(An o Ot coSto + A sin...gradies in n2 (2) the gas density and the sphericity of the atmosphere will playa role in ion I ± Y eos izthe case of VLIII, where distances betwec the

Environmental Assessment for the Continued Exclusive Use of Department of the Army Land Located at U.S. Army Dugway Proving Ground by Members of the U.S. Air Force

Science.gov (United States)

2012-07-01

canned and prepared foods with gamma rays in an effort to kill micro -organisms, trichina in pork, and food-infesting insects (DPG 2001). The Avery...microcommunity consisting of fungi (Basidiomycetes), lichens, soil algae , and mosses typically occurring in semiarid regions. Cyanobacteria-dominated soil... ponds , playas, and wetlands. Constructed surface water features include wastewater lagoons, evaporation ponds , an excavated pond , a bermed pond , and

Cost Effective, Ultra Sensitive Groundwater Monitoring for Site Remediation and Management

Science.gov (United States)

2015-05-01

evaporites, sandstone, gravel, conglomerate, and andesitic basalt . Closed basin; playa, alluvial fan, fluvial 600 to 10,000+ Unconfined, leaky...confined Lower unit Breccia, conglomerate, sandstone, siltstone, and local basaltic to rhyolitic flows and pyroclastic rocks. Alluvial fan, fluvial...with large volumes of groundwater. Three of the cartridges additionally protected by glass fiber filters (Acrodisc AP-4523; Pall GmbH, Dreieich, GE

Environmental radioactivity at Machu Picchu Scientific Station

Energy Technology Data Exchange (ETDEWEB)

Gonzales, S; Osores, J; Jara, R [Direccion General de Seguridad Radiologica, Instituto Peruano de Energia Nuclear, Lima (Peru)

1998-07-01

Studies on environmental radioactivity at the Peruvian Scientific Station were carried out in the last two austral summer periods. The main objective of this study is to establish an environmental radiological monitoring program for evaluating environmental components and achieving a baseline study related to artificial and natural radioactivity levels. For this purpose, samples such as seaweeds, mosses, lichens, soil seawater, ice, marine sediment and underground water were collected from the area surrounding the station starting from Punta Crepin to Playa Inca and Playa Naylamp; then they were pre-conditioned in Machu Picchu Station and were sent to the Environmental Radioactivity laboratory of 'Racso' Peruvian Nuclear Center to conduct beta and gamma spectrometry. The Obtained results showed the presence of Cs-137 in geological components (soil and sediment) and in biological components (lichens and mosses). Nevertheless, those levels seem to be in a range of normal fluctuations after atmospheric nuclear testing and they are not considered to be dangerous to the ecosystem of the Antarctic Region. On the other hand, high concentration of Be-7 has been detected in seaweed and lichens. Other natural radionuclide detected were Ra-226, Bi-214 and K-40.

Environmental radioactivity at Machu Picchu Scientific Station

International Nuclear Information System (INIS)

Gonzales, S.; Osores, J.; Jara, R.

1998-01-01

Studies on environmental radioactivity at the Peruvian Scientific Station were carried out in the last two austral summer periods. The main objective of this study is to establish an environmental radiological monitoring program for evaluating environmental components and achieving a baseline study related to artificial and natural radioactivity levels. For this purpose, samples such as seaweeds, mosses, lichens, soil seawater, ice, marine sediment and underground water were collected from the area surrounding the station starting from Punta Crepin to Playa Inca and Playa Naylamp; then they were pre-conditioned in Machu Picchu Station and were sent to the Environmental Radioactivity laboratory of 'Racso' Peruvian Nuclear Center to conduct beta and gamma spectrometry. The Obtained results showed the presence of Cs-137 in geological components (soil and sediment) and in biological components (lichens and mosses). Nevertheless, those levels seem to be in a range of normal fluctuations after atmospheric nuclear testing and they are not considered to be dangerous to the ecosystem of the Antarctic Region. On the other hand, high concentration of Be-7 has been detected in seaweed and lichens. Other natural radionuclide detected were Ra-226, Bi-214 and K-40

Palaeoenvironmental history of Bap-Malar and Kanod playas of ...

Indian Academy of Sciences (India)

R. Narasimhan (Krishtel eMaging) 1461 1996 Oct 15 13:05:22

Methods. Two pits (W9 & W10) at Bap-Malar (figure 2), to a depth of about 4m, were excavated .... contain gypsum as a principal evaporate mineral, ... have yielded a good number of pollen represented ..... 4. Hill slopes. Not prominent. Prominent. 5. Topography. Gentle. Steep .... ery of Kot Diji pottery on these dunes opens.

Palaeoenvironmental history of Bap-Malar and Kanod playas of ...

Indian Academy of Sciences (India)

Malar and Kanod, have been investigated using palynology, geomorphology, archaeology, AMS-radiocarbon dating, stable isotopes, evaporite mineralogy and geoarchaeology. The principal objective was to obtain a reliable lithostratigraphy of ...

La silla anfibia marina Aquarius vuelve a las playas

OpenAIRE

BARBERA GUILLEM, RICARD; Gómez Herrero, Juan Alfonso; Bermejo Bosch, Ignacio; Navarro Garcia, Francisco Jose; SANCHEZ DE LARA, FERNANDO; Puigcerver Palau, Sergio Antonio; Lahuerta Martinez, Ruben; Moraga Maestre, Ramón

2012-01-01

[EN] Accessibility to recreational areas is a key aspect of quality of life of people with disa - bilities. In this project we have updated the layout of the amphibious wheelchair Aquarius. We have improved functionality, especially the manoeuvrability on the sand. In addition the new design results more attractive and stylish. This project has been supported by Generalitat Valenciana (Regional Valencian Government) within the II Plan de Competitividad de la Empresa Valenciana (PCEV) ...

Centro internacional para windsurfistas, playa de Vargas, Gran Canaria

OpenAIRE

Pérez Sosa, Isacó

2006-01-01

El proyecto propone realizar un centro internacional que reúna tanto las instalaciones necesarias para realizar competiciones de windsurf como un albergue, un gimnasio de mantenimiento e instalaciones para otras actividades acuáticas o de ocio complementarias. El edificio se desarrollará en tres construcciones bajas longitudinales que se adaptaran al terreno empotrándose a él y abriéndose hacia el mar. Originando éstas terrazas se sigue la forma común tradicional de asentamiento sobre el ter...

Herbert Marcuse's Theory of Play--A Social Philosophical Perspective.

Science.gov (United States)

Volkwien, Karin A. E.

Sport has been widely discussed, by conservatives who argue that sport operates within the realm of freedom, and so lies outside the deterministic nexus of capitalist economics and policies, and leftists who argue that sport reproduces the repressive features of capitalism and serves as an ideological tool of the latter. The purpose of this study…

Ecosistemas marino costeros: participación y sustentabilidad

OpenAIRE

Nicolás Cuvi

2014-01-01

Costas rocosas, estuarios y manglares. Puertos, barcos pesqueros, playas, olas. Escenarios donde la relación entre seres humanos y ambiente se singulariza por la presencia del mar.Donde emergen complejas entidades socioambientales, que se manifiestan a veces más, a veces menos, hacia medios de vida sustentables. Es lo que ilustran los tres artículos que componen este dossier.

Demonstration of Advanced Geophysics and Classification Methods on Munitions Response Sites: Closed Castner Range Fort Bliss, TX

Science.gov (United States)

2016-04-01

Basin has had a history of continuous, closed basin deposition, with Kansas playa complexes possibly united with Lake Cabeza de Vaca and/or Lake Lucero...Preparation Set up onsite project area Vegetation trimming Install blind seed items Labor Equipment rental Supplies Travel $74,499 TEMTADS Data...2,200 cued shots including re-collect, background, and IVS measurements) Project Geophysicist Equipment rental Supplies Travel $120,140 TEMTADS Data

Marta maailm / Marta Vaarik

Index Scriptorium Estoniae

Vaarik, Marta, 1987-

2007-01-01

Laulja Lenna Kuurmaa otsib kodu. ETV saatejuht Marko Reikop asutas oma firma "Darren" kontserdisarja "Armastatud superhitid läbi aegade" läbiviimiseks. Soome suusahüppaja ja meelelahutaja Matti Nykänen rokkis märtsikuus Gran Canarial pubis Playa del Inglesis Berry. Laulja Ivo Linna koos abikaasa Imbiga külastasid Prantsusmaad. Singlil "Suusapalavik" laulavad Koit Toome, Taisi Pettai ja telereporter Lembitu Kuuse

Estrategia para el balance cero CO2 en un desarrollo turístico mediterráneo existente

Directory of Open Access Journals (Sweden)

Fernández, A.

2011-10-01

Full Text Available The purpose of this article is to show the carbon reduction strategy for the integrated regeneration of Playa de Palma, Palma de Mallorca. The article will describe the strategy which has been established and the measures planned in order to reach the target of zero CO2 emissions for 2050, and will provide a description of an energy model based 100% on renewable energies. The strategies include not only technological measures aimed at energy efficiency and the integration of renewable energies in buildings and the urban environment, but also other measures designed to change energy consumption patterns. In this latter respect, in addition to citizen awareness programmes, energy demand management models based on intelligent electrical networks will be implemented. The viable implementation of the strategies requires the establishment of energy business models and models for the corporate structures set up around the Palma Beach energy agency.En este artículo se describirá la estrategia que se ha establecido en el desarrollo de regeneración integral de Playa de Palma (Palma de Mallorca y medidas planificadas con el fin implantar el objetivo de emisiones Cero CO2 para el 2050 y la descripción del modelo energético basado 100% en energías renovables. Las estrategias incluyen medidas tecnológicas de eficiencia energética e integración de renovables en edificios y ámbito urbano pero también otras que inciden en la modificación de los patrones de consumo. En este sentido se plantearán además de planes de sensibilización al ciudadano, modelos de la gestión de la demanda energética apoyados en redes eléctricas inteligentes. Así mismo se establecerán los modelos de negocio energético y estructuras societarias constituidas entorno al ente energético Playa de Palma requeridos para hacer viable la implantación de las estrategias.

NESTING ECOLOGY OF THE OLIVE RIDLEY SEA TURTLE (Lepidochelys olivacea (CHELONIIDAE AT EL VALLE BEACH, NORTHERN PACIFIC, COLOMBIA

Directory of Open Access Journals (Sweden)

Karla G. Barrientos-Muñoz

2014-09-01

Full Text Available En Colombia, la tortuga golfina (Lepidochelys olivacea es la más común de las tortugas anidantes. La playa El Valle es considerada la más importante para anidación en Suramérica. La intensa captura de hembras y saqueo de huevos para consumo y comercio local ha sido una práctica común por años. Realizamos un análisis de la ecología de anidación de la tortuga golfina en la Playa El Valle, Pacifico Norte, durante la temporada de 2008. Un total de 164 nidadas fueron transferidas a viveros de protección. El pico de anidación ocurrió durante la segunda quincena de agosto y septiembre con un 64,63 % de las posturas. A lo largo de la playa, el sector 3 presento la mayor frecuencia de anidación con 26 %. Los nidos fueron desovados principalmente en la zona 3, con 69 %. Encontramos 55 hembras y 46 fueron marcadas. El LCC fue (promedio± DE: 64,9 ± 2,4 cm y ACC fue (promedio ± DE: 68,6 ± 2,6 cm. Las hembras desovaron 87,3 ± 14,2 huevos por nidada. Registramos dos eventos de anidación por hembra, con un intervalo de (promedio ± DE: 18,8 ± 4,2 días. El producto reproductivo fue (promedio ± DE: 181,5 ± 34,8 huevos por hembra. El promedio en éxito de eclosión fue 81,1 ±12,1 % y de emergencia 77,6 ± 12,7 %. El período de incubación fue (promedio ± DE: 65 ± 4,7 días. Nuestros datos son una valiosa contribución al conocimiento de la ecología reproductiva de la población de tortugas golfina regional y globalmente.

Assessment of waterlogging in agricultural megaprojects in the closed drainage basins of the Western Desert of Egypt

Directory of Open Access Journals (Sweden)

M. El Bastawesy

2013-04-01

Full Text Available This paper investigates the development of waterlogging in the cultivated and arable areas within typical dryland closed drainage basins (e.g. the Farafra and Baharia Oases, which are located in the Western Desert of Egypt. Multi-temporal remote sensing data of the Landsat Thematic Mapper (TM and Enhanced Thematic Mapper (ETM+ were collected and processed to detect the land cover changes; cultivations, and the extent of water ponds and seepage channels. The Shuttle Radar Topography Mission (SRTM digital elevation model (DEM has been processed to delineate the catchment morphometrical parameters (i.e. drainage networks, catchment divides and surface areas of different basins and to examine the spatial distribution of cultivated fields and their relation to the extracted drainage networks. The soil of these closed drainage basins is mainly shallow and lithic with high calcium carbonate content; therefore, the downward percolation of excess irrigation water is limited by the development of subsurface hardpan, which also saturates the upper layer of soil with water. The subsurface seepage from the newly cultivated areas in the Farafra Oasis has revealed the pattern of buried alluvial channels, which are waterlogged and outlined by the growth of diagnostic saline shrubs. Furthermore, the courses of these waterlogged channels are coinciding with their counterparts of the SRTM DEM, and the recent satellite images show that the surface playas in the downstream of these channels are partially occupied by water ponds. On the other hand, a large water pond has occupied the main playa and submerged the surrounding fields, as a large area has been cultivated within a relatively small closed drainage basin in the Baharia Oasis. The geomorphology of closed drainage basins has to be considered when planning for a new cultivation in dryland catchments to better control waterlogging hazards. The "dry-drainage" concept can be implemented as the drainage and

Propuesta de indicadores alternos, a partir de un análisis basado en indicadores convencionales y las asimetrías en municipios turísticos con destinos de sol y playa

Directory of Open Access Journals (Sweden)

Reyna María Ibáñez Pérez

2017-01-01

Full Text Available México se ubica entre las naciones con mayor recepción de turistas, sin embargo, las condiciones asociadas a su desarrollo no son captadas por cifras institucionales. Por ello es necesario generar indicadores alternos para visualizar, bajo otra óptica, sus impactos. En es te trabajo se hace un análisis del comportamiento de variables socioeconómicas y turísticas de cuatro municipios con destinos de sol y playa de la Región Noroeste de México: Los Cabos, Mazatlán, Puerto Peñasco y Ensenada; con la finalidad de detectar difer encias y similitudes durante el periodo comprendido entre 2000 y 2015; así como complementar la información con indicadores alternos aquí propuestos. Para este fin, se utilizaron técnicas cuantitativas como agrupamiento de series de tiempo y estimación de tasas de crecimiento, además de que se empleó el método gráfico y se hizo una exhaustiva revisión de literatura. Los resultados revelaron que, aunque Ensenada contaba con mayor número y tasa de crecimiento de establecimientos de hospedaje, en 2015 presentó la menor cantidad de cuartos y unidades de hospedaje, de turistas, ocupación y estadía promedio; mientras que Los Cabos mantuvo la mayor cantidad y tasa de crecimiento de cuartos, turistas, estadía y ocupación promedio. En lo referente a variables demográ ficas y socioeconómicas, este último municipio mostró la tasa de crecimiento y densidad poblacional más elevada, el IDH más alto y el mayor nivel de remuneraciones. Mazatlán se ubicó en el nivel más bajo de marginación y pobreza, además de que obtuvo el ma yor grado de escolaridad. Esto revela que a largo plazo, no necesariamente el destino con mayores remuneraciones, infraestructura, estadía y ocupación ostentará los más bajos niveles de marginación o pobreza. Con relación a los indicadores propuestos, se c orroboró que el desarrollo turístico genera presiones importantes en el ambiente, ya sea por el incremento en la demanda

Lithium Resources for the 21st Century

Science.gov (United States)

Kesler, S.; Gruber, P.; Medina, P.; Keolian, G.; Everson, M. P.; Wallington, T.

2011-12-01

Lithium is an important industrial compound and the principal component of high energy-density batteries. Because it is the lightest solid element, these batteries are widely used in consumer electronics and are expected to be the basis for battery electric vehicles (BEVs), hybrid electric vehicles (HEVs) and plug-in hybrid electric vehicles (PHEVs) for the 21st century. In view of the large incremental demand for lithium that will result from expanded use of various types of EVs, long-term estimates of lithium demand and supply are advisable. For GDP growth rates of 2 to 3% and battery recycling rates of 90 to 100%, total demand for lithium for all markets is expected to be a maximum of 19.6 million tonnes through 2100. This includes 3.2 million tonnes for industrial compounds, 3.6 million tonnes for consumer electronics, and 12.8 million tonnes for EVs. Lithium-bearing mineral deposits that might supply this demand contain an estimated resource of approximately 39 million tonnes, although many of these deposits have not been adequately evaluated. These lithium-bearing mineral deposits are of two main types, non-marine playa-brine deposits and igneous deposits. Playa-brine deposits have the greatest immediate resource potential (estimated at 66% of global resources) and include the Salar de Atacama (Chile), the source of almost half of current world lithium production, as well as Zabuye (China/Tibet) and Hombre Muerto (Argentina). Additional important playa-brine lithium resources include Rincon (Argentina), Qaidam (China), Silver Peak (USA) and Uyuni (Bolivia), which together account for about 35% of the estimated global lithium resource. Information on the size and continuity of brine-bearing aquifers in many of these deposits is limited, and differences in chemical composition of brines from deposit to deposit require different extraction processes and yield different product mixes of lithium, boron, potassium and other elements. Numerous other brines in playas

Large-scale gravity sliding in the Miocene Shadow Valley Supradetachment Basin, Eastern Mojave Desert, California

Science.gov (United States)

Davis, G. A.; Friedmann, S. J.

2005-12-01

The Miocene Shadow Valley basin in the eastern Mojave Desert of California developed above the active west-dipping Kingston Range-Halloran Hills extensional detachment fault system between 13.5 and ca. 7 mybp. Although mass-wasting processes are common phenomena in supradetachment basins, the Shadow Valley basin is an exceptional locale for the study of such processes, especially rock-avalanches and gravity sliding. A score of megabreccias, interpreted as rock-avalanche deposits, and half that number of very large (> 1 km 2, up to 200 m thick), internally intact gravity-driven slide sheets are interbedded with various sedimentary facies. The slide sheets, variably composed of Proterozoic crystalline rocks and Proterozoic, Paleozoic, and Tertiary sedimentary strata, moved across both depositional and erosional surfaces in the basin. Although the majority consist of Paleozoic carbonate rocks, the largest slide sheet, the Eastern Star crystalline allochthon, contains Proterozoic gneisses and their sedimentary cover and is now preserved as klippen atop Miocene lacustrine and alluvial fan deposits over an area > 40 km 2. Estimates of slide sheet runouts into the basin from higher eastern and northern source terranes range from approximately a few km to > 10 km; in most cases the exact provenances of the slide blocks are not known. The basal contacts of Shadow Valley slide sheets are characteristically knife sharp, show few signs of lithologic mixing of upper- and lower-plate rocks, and locally exhibit slickensided and striated, planar fault-like bases. Pronounced folding of overridden Miocene lacustrine and fan deposits beneath the Eastern Star allochthon extends to depths up to 40 m at widely scattered localities. We conclude that this slow moving slide sheet encountered isolated topographic asperities (hills) and that stress transfer across the basal slide surface produced folding of footwall strata. Synkinematic gypsum veins in footwall playa sediments, with fibers

Las Andesitas Estrechura del Complejo Volcánico Piroclástico del Río Chubut Medio (Paleoceno-Eoceno Medio) The Estrechura Andesites from the Middle Rio Chubut Volcanic-Pyroclastic Complex (Paleocene-Middle Eocene)

OpenAIRE

E. Aragón; Y.E. Aguilera; V.C. Consoli; C.E. Cavarozzi; A. Ribot

2004-01-01

Las Andesitas Estrechura muestran una tendencia evolutiva basalto-traquita del tipo toleítico transicional. En esta secuencia la inmisciblidad líquida está presente desde los basaltos hasta las traquitas. Esto permite establecer que: los basaltos y traquibasaltos representan el magma que se está fraccionando; las traquiandesitas son la mezcla de magma basáltico enriquecido con líquido inmiscible y las traquitas son el líquido inmiscible alojado en el techo de la cámara magmática. Aunque estos...

Annual Report of the Chief of Engineers, U.S. Army, on Civil Works Activities 1961. Volume 1

Science.gov (United States)

1961-01-01

dollars) Classification Total Active De - Ink Total Active De - In- ferred active ferred active Navigation..------------------ 2,604 2,450 42 112 6,138...Sioux City, Iowa.... New York and New Jersey Channels, N.Y. and N.J.. Pike Island Locks and Dam, Ohio River, W. Va..... Playa Del Rey Inlet and Harbor...Jun 61 -1965 Do. Hall Meadow Brook, Conn __ . ___------- - Oct 60 1962 Reservoir. Hunt and Lima Lake Drainage District, Illinois

Ecosistemas marino costeros: participación y sustentabilidad

Directory of Open Access Journals (Sweden)

Nicolás Cuvi

2014-04-01

Full Text Available Costas rocosas, estuarios y manglares. Puertos, barcos pesqueros, playas, olas. Escenarios donde la relación entre seres humanos y ambiente se singulariza por la presencia del mar.Donde emergen complejas entidades socioambientales, que se manifiestan a veces más, a veces menos, hacia medios de vida sustentables. Es lo que ilustran los tres artículos que componen este dossier.

Consecuencias socio-económicas asociadas a la erosión costera en el Balneario Parque Mar Chiquita, Argentina

Directory of Open Access Journals (Sweden)

Alejandra Merlotto

2007-01-01

Full Text Available La erosión costera es un fenómeno natural que constituye un problema ambiental de gran importancia en la provincia de Buenos Aires (Argentina y especialmente en el Balneario Parque Mar Chiquita. Dada la magnitud del proceso erosivo, el objetivo de este trabajo ha sido analizar las implicancias socio-económicas que el mismo ha ocasionado en el pueblo. A partir de fotografías aéreas se evaluó la evolución de la ocupación urbana y la pérdida de lotes y viviendas en la franja costera en diversos cortes históricos y se revisó la legislación sobre fundación de pueblos. Se constató que la misma dejó importantes vacíos en cuanto a la determinación del dominio público en la zona adyacente a la playa, aprovechados por ciertos actores sociales para obtener mayores beneficios. La problemática ha originado importantes pérdidas económicas para el área debido a la gran cantidad de damnificados que no recibieron resarcimiento, sumado a un deterioro paisajístico que perjudicó el desarrollo del turismo de sol y playa.

Three-dimensional geologic mapping of the Cenozoic basin fill, Amargosa Desert basin, Nevada and California

Science.gov (United States)

Taylor, Emily M.; Sweetkind, Donald S.

2014-01-01

Understanding the subsurface geologic framework of the Cenozoic basin fill that underlies the Amargosa Desert in southern Nevada and southeastern California has been improved by using borehole data to construct three-dimensional lithologic and interpreted facies models. Lithologic data from 210 boreholes from a 20-kilometer (km) by 90-km area were reduced to a limited suite of descriptors based on geologic knowledge of the basin and distributed in three-dimensional space using interpolation methods. The resulting lithologic model of the Amargosa Desert basin portrays a complex system of interfingered coarse- to fine-grained alluvium, playa and palustrine deposits, eolian sands, and interbedded volcanic units. Lithologic units could not be represented in the model as a stacked stratigraphic sequence due to the complex interfingering of lithologic units and the absence of available time-stratigraphic markers. Instead, lithologic units were grouped into interpreted genetic classes, such as playa or alluvial fan, to create a three-dimensional model of the interpreted facies data. Three-dimensional facies models computed from these data portray the alluvial infilling of a tectonically formed basin with intermittent internal drainage and localized regional groundwater discharge. The lithologic and interpreted facies models compare favorably to resistivity, aeromagnetic, and geologic map data, lending confidence to the interpretation.

The economic valuation of the recreational benefits of Dichato Beach (tome-Chlie

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Sergio Alonso Orrego

1997-07-01

Full Text Available Las condiciones naturales y la infraestructura de servicios existente en la playa de Dichato (VIII Región-Chile, posibilitan la presencia de un considerable número de familias durante las temporadas de verano. Mediante la adecuada aplicación del método del costo de viaje, es posible estimar la demanda recreacional de la playa y sus beneficios económicos. El documento privilegia la modelación del número de viajes efectuados durante un período de tiempo determinado, y en este sentido presenta los resultados econométricos de los siguientes modelos estadísticos: estimación por mínimos cuadrados ordinarios de una forma funcional lineal (OLSL, y de una forma semi-log (OLSS; estimación por máxima verosimilitud de una forma funcional lineal (MLEL, de una semi-log (MLES, de una distribución Poisson tanto general (POIS como truncada (TPOIS, y de una distribución de una Binomial Negativa también general (BNEG como truncada (TBNEG. En total son ocho (8 modelos, de los cuales OLSL, OLSS, MLEL y MLES se caracterizan por generar estimadores basados en distribuciones de probabilidades continuas. Los restantes modelos POIS, TPOIS, BNEG y TBNEG, corresponden a distribuciones discretas.

Assessment and Determination land uses of Qom's Hoze Soltan Lake southern lands by FAO Agenda and It's Rehabilitation Strategies

Science.gov (United States)

Karimpour Reihan, Majid

2010-05-01

Increase of playas, decrease of water quality, soil and plant degradation is one of important problems in recent decays. Notwithstanding increase of playa wetlands- 4 million ha in our country- is perform some investigations about this biome and components and this lack of investigation is made degradation of water, soil, plant potentials and at least desertification. Then, management the biome and planning for sustainable development is very important because of sensitive this environments and has requirement to recognize ecological properties and components, so in this study, try to investigate fasting and latent this regions. At last for potentialization of region for rangeland, water and dry culture use, assessment and classification of region was performed with aim of FAO formula. According to this formula, environmental factors studied and performed grading and classifying. Basis on results, the region is not proper for dry farming and view of water farming and rangeland was settled in 5 and 6 classes. Latest result should be conserving the region. For this act, our introduced 13 halophyte plats with view of investigation of 20 factors. May god will, ganged this regions to good rangelands and forests of dry regions. Key words: Assessment of lands, Hoze Soltane of Qom, environmental factors, FAO, Compatible Plants, Reclamation strategies

The subspecific characters and distribution of the New World Skimmers - Rynchops nigra The subspecific characters and distribution of the New World Skimmers - Rynchops nigra

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Wetmore Alexander

1944-09-01

Full Text Available The distribution of the forms of the New World rayador, or skimmer, Rynchops nigra, and the characters that mark the geographic races, have been matters of interest to me for a number of years, an interest heightened by recent discussions in current literature of the identity of the birds found on the Pacific coast of Mexico, and far to the south in Chile. Investigation into these matters with the material available in the National Museum not being conclusive, specimens from Mexico and the West Indies southward to Argentina and Chile in other large collections in the United states have been assembled through the courtesy of Dr. Robert Cushman Murphy of the American Museum of Natural History, James l.. Peters of the Museum of Comparative Zoology,W. E. C. Todd of the Carnegie Museum, and Dr. Karl P. Schmidt of the Field Museum of Natural History. I have also to thank Dr. Alden H. Miller for the use of one specimen from Chubut in the Museum of Vertebrate Zoology, and Dean Amadon for certain notes on this group of birds that he had assembled.The distribution of the forms of the New World rayador, or skimmer, Rynchops nigra, and the characters that mark the geographic races, have been matters of interest to me for a number of years, an interest heightened by recent discussions in current literature of the identity of the birds found on the Pacific coast of Mexico, and far to the south in Chile. Investigation into these matters with the material available in the National Museum not being conclusive, specimens from Mexico and the West Indies southward to Argentina and Chile in other large collections in the United states have been assembled through the courtesy of Dr. Robert Cushman Murphy of the American Museum of Natural History, James l.. Peters of the Museum of Comparative Zoology,W. E. C. Todd of the Carnegie Museum, and Dr. Karl P. Schmidt of the Field Museum of Natural History. I have also to thank Dr. Alden H. Miller for the use of one specimen

Participation in Farm Markets in Rural Northwest Pakistan: A Regression Analysis

OpenAIRE

Inayatullah Jan

2012-01-01

Participation in farm markets is important for increasing income of farmers in the developing countries. A number of factors account for a household participation in agricultural marketing. This study attempts to explore such associated factors which playa significant role in farmers’ participation in farm markets in rural northwest Pakistan. Drawing on empirical data from the field survey; gur, vegetables, and milk were the main products offered for marketing in the area. The degree of speci...

Theater of Operations Construction in the Desert. A Handbook of Lessons Learned in the Middle East. Phase I.

Science.gov (United States)

1981-01-01

pavements (calcrete duricrusts ) for coarse aggregate sources, discard the top 1 ft because it is most highly contaminated by chlorides and sulfates. Most...The basic cross " sabkhas, sa/inas, salt playas and some sectional profile comprises a mountain duricrusts , unsuitable construction and a piedmont plain...various forms of metres below the surface, where for stops when sand and silts are damp: " duricrust ". The latter is often, but not example :,vers of

Actividades comunicativas en la clase de Inglés : project work. News about your city

OpenAIRE

Valero Garcés, Carmen

1991-01-01

In the context of language learning, projects are multiskill activities focusing on topics or themes rather than on specific language targets. Students themselves playa crucial part in the initial choice of subject matter and the decisions related to appropiate working method, the project timetable and the eventual «end product». Project work provides students with opportunities to recycle know language and skills in a relatively natural context because specific language a...

Army Support to the United States Border Patrol in the 21st Century

Science.gov (United States)

2011-05-19

and Lieutenant Colonel (Promotable) Clifford J. Weinstein (United States Marine Corps). Thank you for letting me travel this important journey and...Operating Bases in Deming and Playas , New Mexico. The 4-14 CAV was preparing for its deployment to the Joint Readiness Training Center (JRTC) at Fort Polk...write strategic policy. Once a suitable bench of key planners comes back to USBP, they can travel throughout the UCs and train other agents across the

Technical procedures for ecology: Environmental field program, Deaf Smith County Site, Texas: Final draft

International Nuclear Information System (INIS)

1987-08-01

This volume contains Technical Procedures pursuant to the Land Use Site Study Plan including walkover surveys for threatened, endangered, or candidate species; vegetation classification and mapping; reclamation planning; wetland and floodplain determination and characterization of playas; wildlife habitat mapping methods; mammal sampling; bird survey methods; reptile and amphibian survey methods; preexisting environmental; stress and disturbance studies methods; voucher specimens for plants; and voucher specimens to wildlife. 9 refs., 5 figs., 1 tab

PRAMU. Contamination sources

International Nuclear Information System (INIS)

Asenjo, Armando R.

2000-01-01

Mining and milling activities have been carried out in Argentina during the last 40 years, and nowadays National Atomic Energy Commission (CNEA) of Argentina is undertaking the Uranium Mining Environmental Restoration Project (PRAMU). The aim of this project is to achieve that in all the places where uranium mining activities were developed, to restore the environment as much as it is possible, according to the legislation in force. The sites which are studied are: Malargue (Mendoza province), Cordoba (Cordoba province), Los Gigantes (Cordoba province), Huemul (Mendoza province), Pichinan (Chubut province), Tonco (Salta province), La Estela (San Luis province), Los Colorados (La Rioja province). In order to develop the restoration project in each site, one of the first task to be performed is to know quantities and the chemical, physicals and radiological characteristics of the contamination sources. In the present paper the activities of PRAMU in this field, are informed. (author)

APLICACIÓN DEL MÉTODO TERRITORII EN DOS ASENTAMIENTOS ESPONTÁNEOS DE PUERTO MADRYN, ARGENTINA

Directory of Open Access Journals (Sweden)

María Paula Ferrari

2016-01-01

Full Text Available El objetivo del trabajo es realizar un diagnóstico socio-territorial de dos asentamientos espontáneos de la ciudad de Puerto Madryn (Chubut, Argentina: La Lomita y Alta Tensión, a partir de la aplicación del Método Territorii y sus ocho fases -territorios reales, vividos, pasados, legales, pensados, posibles, concertados e inteligentes. El propósito es acompañar a las comunidades en la construcción de territorios más sustentables e identificar en los actores partícipes del proceso en qué medida están presentes las cuatro modalidades de transformación propuestas por la Red Internacional de Inteligencia Territorial: subjetiva, social, ambiental y desicional, así como también las “cuatro patas de la mesa” de la inteligencia territorial latinoamericana: actores públicos, comunitarios, empresarios y científicos.

El polen de las mieles del valle de Río Negro, provincia fitogeográfica del monte (Argentina

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María C. Tellería

2000-01-01

Full Text Available Tellería, M. C. & Forcone, A. 2000. El polen de las mieles del valle de Río Negro, provinciafitogeográfica del monte (Argentina. Darwiniana 38(3-4: 273-277.Se realizó el análisis palinológico de 41 muestras de miel del valle de Río Negro. El contenido polínicode las muestras fue acetolizado e identificado por comparación con una colección de polen de referencia.Del total de muestras examinadas, 26 fueron mixtas y las restantes monoflorales de: Tamarix gallica (8muestras, Eucalyptus sp. (2 muestras, Melilotus sp. (1 muestra, Centaurea sp. (1 muestra, Prosopissp. (1 muestra, Brassicaceae (1 muestra y Monttea aphylla (1 muestra. Estas mieles pueden diferenciar-se de aquellas que se producen en el valle inferior del río Chubut, en la misma región fitogeográfica

Diversidad de musgos en ambientes degradados sujetos a restauración en el Parque Nacional Lago Puelo (Chubut, Argentina Moss diversity in degraded environments under restoring in the Lago Puelo National Park (Chubut, Argentina

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ADRIANA E ROVERE

2011-12-01

Full Text Available La restauración ecológica es una disciplina que intenta recuperar atributos perdidos en un ecosistema (diversidad de especies, estructura y función. El objetivo de este trabajo fue evaluar la diversidad de musgos y sus formas de vida en tres ambientes con diferentes niveles de degradación y los sustratos en los que estos se desarrollan. El área de estudio corresponde a un sector que se está restaurando dentro de la Reserva Nacional Lago Puelo. En ella se encuentran tres ambientes distintos: (1 área remanente de bosque maduro de Nothofagus dombeyi, (2 bosque secundario de Austrocedrus chilensis, y (3 matorral dominado por especies exóticas. Se recorrió cada uno de los ambientes, registrando los sustratos con musgos, formas de vida y géneros. Los resultados evidencian una reducción de los sustratos disponibles y de las especies presentes conforme avanza el grado de alteración, desde el área de bosque maduro de N. dombeyi (9 sustratos: 17 géneros: 7 formas de vida, al sector de bosque secundario de A. chilensis (6 sustratos: 8 géneros: 5 formas de vida, siendo menor en el matorral dominado por especies exóticas (1 sustrato: 4 géneros: 3 formas de vida. Los musgos desempeñan funciones importantes en los ecosistemas, son fundamentales en el balance hídrico, pioneros en suelos inestables controlando la erosión y colonizando sitios alterados, sirven como hábitat y alimento para invertebrados, y también constituyen sitios propicios para la germinación de plantas vasculares. Si bien algunas especies leñosas ven afectada su germinación por la presencia de musgos, estos facilitan la germinación de otras especies arbóreas de los bosques templados. Los resultados podrían ser utilizados en restauración, ya sea recreando los sustratos ausentes o realizando traslado de sustratos con musgos, a fin de favorecer la recuperación de áreas boscosas degradadas considerando la biodiversidad original.Ecological restoration is a discipline that seeks to recover the attributes of an ecosystem which have been lost (species diversity, structure and function. The objective of this work was to evaluate the diversity and different life forms of mosses in three environments with varying levels of degradation, as well as the different substrates they grow on. Our study area lies within Lago Puelo National Reserve, in a sector undergoing restoration. Three different environments are found in this sector: (1 a remnant of mature Nothofagus dombeyi forest, (2 secondary Austrocedrus chilensis forest and (3 scrubland dominated by exotic species. Each of these environments was analyzed, and substrates with mosses, life forms and genera were registered. Our results showed a decrease in available substrates and species present as the level of disturbance increased, from the area of mature N. dombeyi forest (9 substrates; 17genera; 7 life forms, followed by the A. chilensis secondary forest (6 substrates: 8 genera: 5 life forms , to the scrubland dominated by exotic species (1 substrate; 4 genera; 3 life forms. Mosses carry out important functions in ecosystems, as they are essential to the water balance, they are pioneers in unstable soils, where they control erosion and colonize disturbed sites, they provide habitat and food for invertebrates, and also constitute suitable sites for the germination of vascular plants. Although the germination of some woody species is negatively affected by the presence of mosses, the germination of other temperate forest tree species is favored. These results can be useful in restoration, whether for the recreation of absent substrates or the transfer of substrates with mosses, in order to promote the recovery of degraded forest areas to their original levels of biodiversity.

Aeolian sedimentation in the middle buntsandstein in the eifel north-south depression zone: Summary of the variability of sedimentary processes in a buntsandstein erg as a base for evaluation of the mutual relationships between aeolian sand seas and fluvial river systems in the mid-european buntsandstein

Science.gov (United States)

Mader, Detlef

The spectrum of aeolian depositional subenvironments in the upper Middle Buntsandstein Karlstal-Schichten sequence in the Eifel North-South-zone at the western margin of the Mid-European Triassic Basin comprises trains of larger and higher narrowly-spaced dunes in sand seas, isolated smaller and lower widely-spaced dunes in floodplains and interdune playas, dry interdune sheet sands, damp interdune adhesive sandflats, wet interdune playa lakes, rainfall runoff watercourses and ephemeral channels cutting through the dune belt, and deflation gravel lag veneers. Distinction of aeolian and fluvial sediments within the succession of closely intertonguing wind- and water-laid deposits is possible by independent analysis of the conventional criteria and the more modern stratification styles. Thick cross-bedded aeolian sand sequences originate as barchanoid-type dunes which accumulate and migrate in the regime of narrow to wide unimodal southeasterly to southwesterly trade winds in low northern palaeolatitude in summer when the intertropical convergence zone is shifted to the north. The predominantly transverse-ridge dunes accrete mainly by grainfall and subcritical climbing of wind ripples, subordinately also by grainflow interfingering with grainfall. Horizontal-laminated aeolian sands form as sand sheets in dry interdune playas by subcritical migration of wind ripple trains, rarely also by plane bed accretion. Thin cross-bedded dune sands or horizontal-laminated aeolian sands capping fluvial cyclothems originate by deflation of emerged alluvial bar sands during low-water stages and subsequent accumulation of the winnowed sand as widely-spaced dunelets or chains of wind ripples in desiccated parts of the adjoining floodplain. The aeolian sand layers at the base of lacustrine cyclothems record migration of isolated little dunes across the dry playa floor at the beginning of a wetting-upwards cyclothem, with the sand deriving from deflation of fluvial incursions or

Geohydrology and water utilization in the Willcox Basin, Graham and Cochise Counties, Arizona

Science.gov (United States)

Brown, S.G.; Schumann, Herbert H.

1969-01-01

The Willcox basin is an area of interior drainage in the northern part of Sulphur Springs Valley, Cochise and Graham Counties, Ariz. The basin comprises about 1,500 square miles, of which the valley floor occupies about 950 square miles. The basin probably formed during middle and late Tertiary time, when the area was subjected to large-scale faulting accompanied by the uplift of the mountain ranges that presently border it. During and after faulting, large quantities of alluvium were deposited in the closed basin. The rocks in the basin are divided into two broad groups--the rocks of the mountain blocks, of Precambrian through Tertiary age, and the rocks of the basin, of Tertiary and Quaternary age. The mountain blocks consist of igneous, metamorphic, and sedimentary rocks; the water-bearing characteristics of these rocks depend primarily on their degree of weathering and fracturing. Even in areas where these rocks are fractured and jointed, only small amounts of water have been developed. The rocks of the basin consist of moderately consolidated alluvium, poorly consolidated alluvium, and unconsolidated alluvium. The water-bearing characteristics of the moderately and poorly consolidated alluvium are not well known. The unconsolidated alluvium underlies most of the valley floor and consists of two facies, stream deposits and lake beds associated with the old playa. The lenticular sand and gravel layers interbedded in silt- and clay-size material of the unconsolidated alluvium constitute the principal aquifer in the basin. The other aquifers, which yield less water, consist of beds of poorly to moderately consolidated sand- and gravel-size material; these beds occur in both the poorly consolidated and moderately consolidated alluvium. In the Stewart area the median specific capacity of wells per 100 feet of saturated unconsolidated alluvium was 20 gallons per minute, and in the Kansas Settlement area the specific capacity of wells penetrating the poorly and

Necesidades de aprendizaje del especialista de Medicina General Integral, acerca de la conducta suicida Learning needs of the specialist in Integral General Medicine on the suicidal behavior

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Víctor Tadeo Pérez Martínez

2011-12-01

Full Text Available Introducción: Las necesidades de aprendizaje o capacitación se dan a partir del contraste entre el desempeño ideal y el real, bien sea para un individuo o un grupo determinado. Constituyen el punto de partida para la búsqueda de una solución pedagógica que capacite y contribuya a la transformación cualitativa de los servicios de salud. Su oportuna identificación, es una herramienta de la educación permanente. Objetivo: Identificar las necesidades de aprendizaje de los médicos que laboran en los equipos de atención primaria de salud, acerca de la conducta suicida, en tres policlínicos del municipio Playa. Métodos: Se realizó la identificación de las necesidades de aprendizaje mediante un cuestionario escrito, que se aplicó de forma colectiva y anónima a 20 especialistas de Medicina General Integral, seleccionados al azar, que laboran en tres policlínicos del extremo Este, del municipio Playa. Resultados: Se puntualizaron las deficiencias e insuficiencias de los conocimientos y habilidades profesionales acerca del comportamiento suicida, sobre todo en lo que se refiere a la perspectiva clínica de este complejo y multidimensional fenómeno. Conclusiones: A pesar de que la conducta suicida constituye, en el primer nivel de atención, uno de los programas priorizados, en lo que a salud mental se refiere, la mayoría de los especialistas presenta dificultades en la atención integral de estos pacientes, lo cual constituye un riesgo poco explorado. En ocasiones, su evaluación adolece, de elementos de indagación y análisis, lo que afecta el adecuado seguimiento de estos.Introduction: Learning needs or training appear from the contrast between the ideal and real performance whether for an subject or a determined group, being the start point for search of a educational solution training and contributing to qualitative transformation of health services. Its timely identification is a tool of the permanent education. Objectives: To

Edificio de apartamentos en la Playa del Inglés

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López Díaz, L.

1978-11-01

Full Text Available 432 apartments are distributed in the eight upper floors of this building, each including a bedroom, kitchen - dinning - living area, bath-room, laundry terrace and a small miscellaneous room near the entry vestibule. The public areas are located in an ample semi-basement and include a bar, a restaurant with kitchen area, night club, movie theater, shops, gymnasium with sauna bath, storage areas and a full range of facilities. The floorplan is Y-shaped to permit locating the vertical traffic core in its geometric hub, thus minimising the walking distance to each apartment. An interesting feature of the design is a pair of landscaped inner courtyards, one hexagonal in shape, surrounded by a ramp increasing the means for vertical movement of the public, and the other triangular, enclosed by the corridors leading to the apartments. The structural design is based on reinforced Steel construction and the façades are treated with prefab planters in a straight or a winding line enclosing respectively the galleries and the apartments terraces. The outside áreas include many and varied sports and recreational.

En sus ocho plantas superiores se han distribuido 432 apartamentos compuestos de: dormitorio, cocina-comedor-estar, cuarto de baño, terraza con tendedero, y un pequeño trastero en el vestíbulo de entrada. Las dependencias comunes como: bar, restaurante, cocina, sala de fiestas, cine, locales comerciales, gimnasio con sauna, almacenes y toda una serie de instalaciones, se han ubicado en el amplio semisótano. Se ha aprovechado la conformación de la planta según una gran Y para situar el núcleo de comunicaciones verticales en su centro geométrico, lo que permite reducir al máximo los recorridos de acceso a cada apartamento. Nota interesante de la obra son los dos patios interiores ajardinados; uno hexagonal, circundado por una rampa que amplía el número de las comunicaciones verticales, y el otro triangular, limitado por las galerías abiertas que conducen a los apartamentos. La construcción se ha llevado a cabo mediante una estructura de hormigón armado, resolviéndose las fachadas con jardineras prefabricadas que, según líneas rectas o sinusoidales, cierran galerías y terrazas, respectivamente. En las superficies exteriores se ha dispuesto un variado número de instalaciones deportivas y recreativas, así como un extenso espacio de aparcamiento.

Response of CO and H2 uptake to extremes of water stress in saline and non-saline soils

Science.gov (United States)

King, G.

2017-12-01

Neither carbon monoxide (CO) nor hydrogen (H2) have direct impacts on radiative forcing, but both play important roles in tropospheric chemistry. Soils affect both the fate and significance of atmospheric CO and H2 by acting as strong global gas sinks ( 15% and >75 %, respectively), but much remains unknown about the microbiology of these gases, including responses to key environmental drivers. The role of water availability, measured as water potential, has been addressed to a limited extent by earlier studies with results suggesting that CO and H2 uptake are strongly limited by water stress. However recent results indicate a much greater tolerance of water stress than previously suspected. Ex situ assays have shown that non-saline playa soils from the Alvord Basin (Oregon, USA) consumed atmospheric and exogenous hydrogen and CO under conditions of severe water stress. CO uptake occurred at water potentials values considered optimal for terrestrial bacterial growth. Surface soils that had been exposed to water potentials as low as -300 MPa also oxidized CO and H2 after brief equilibration at higher potentials (less water stress), indicating remarkable tolerance of desiccating conditions. Tolerance to water stress for CO and H2 uptake was also observed for soils from a montane rainforest (Hawai`i, USA). However, unlike playa soils rainforest soils seldom experience extended drought that would select for desiccation tolerance. While CO uptake by forest soils was more sensitive to water stress (limits -10MPa) than in playa soils, H2 uptake was observed at -90 MPa to -100 MPa. Tolerance at these levels might be due to the formation of intracellular water that limits the local effects of stress. Comparisons of water stress responses between saline and non-saline soils further suggested that communities of CO- and H2-oxidizing were generally robust with respect to stresses resulting from solute and matric effects. Collectively the results indicate that models of global

Geomorphic and land cover identification of dust sources in the eastern Great Basin of Utah, U.S.A.

Science.gov (United States)

Hahnenberger, Maura; Nicoll, Kathleen

2014-01-01

This study identifies anthropogenically disturbed areas and barren playa surfaces as the two primary dust source types that repeatedly contribute to dust storm events in the eastern Great Basin of western Utah, U.S.A. This semi-arid desert region is an important contributor to dust production in North America, with this study being the first to specifically identify and characterize regional dust sources. From 2004 to 2010, a total of 51 dust event days (DEDs) affected the air quality in Salt Lake City, UT. MODIS satellite imagery during 16 of these DEDs was analyzed to identify dust plumes, and assess the characteristics of dust source areas. A total of 168 plumes were identified, and showed mobilization of dust from Quaternary deposits located within the Bonneville Basin. This analysis identifies 4 major and 5 secondary source areas for dust in this region, which produce dust primarily during the spring and fall months and during moderate or greater drought conditions, with a Palmer Drought Index (PDI) of - 2 or less. The largest number of observed dust plumes (~ 60% of all plumes) originated from playas (ephemeral lakes) and are classified as barren land cover with a silty clay soil sediment surface. Playa surfaces in this region undergo numerous recurrent anthropogenic disturbances, including military operations and anthropogenic water withdrawal. Anthropogenic disturbance is necessary to produce dust from the vegetated landscape in the eastern Great Basin, as evidenced by the new dust source active from 2008 to 2010 in the area burned by the 2007 Milford Flat Fire; this fire was the largest in Utah's history due to extensive cover of invasive cheatgrass (Bromus tectorum) along with drought conditions. However, dust mobilization from the Milford Flat Burned Area was limited to regions that had been significantly disturbed by post-fire land management techniques that consisted of seeding, followed by chaining or tilling of the soil. Dust storms in the eastern

Stable chlorine isotopes in arid non-marine basins: Instances and possible fractionation mechanisms

International Nuclear Information System (INIS)

Eastoe, C.J.

2016-01-01

Stable chlorine isotopes are useful geochemical tracers in processes involving the formation and evolution of evaporitic halite. Halite and dissolved chloride in groundwater that has interacted with halite in arid non-marine basins has a δ 37 Cl range of 0 ± 3‰, far greater than the range for marine evaporites. Basins characterized by high positive (+1 to +3‰), near-0‰, and negative (−0.3 to −2.6‰) are documented. Halite in weathered crusts of sedimentary rocks has δ 37 Cl values as high as +5.6‰. Salt-excluding halophyte plants excrete salt with a δ 37 Cl range of −2.1 to −0.8‰. Differentiated rock chloride sources exist, e.g. in granitoid micas, but cannot provide sufficient chloride to account for the observed data. Single-pass application of known fractionating mechanisms, equilibrium salt-crystal interaction and disequilibrium diffusive transport, cannot account for the large ranges of δ 37 Cl. Cumulative fractionation as a result of multiple wetting-drying cycles in vadose playas that produce halite crusts can produce observed positive δ 37 Cl values in hundreds to thousands of cycles. Diffusive isotope fractionation as a result of multiple wetting-drying cycles operating at a spatial scale of 1–10 cm can produce high δ 37 Cl values in residual halite. Chloride in rainwater is subject to complex fractionation, but develops negative δ 37 Cl values in certain situations; such may explain halite deposits with bulk negative δ 37 Cl values. Future field studies will benefit from a better understanding of hydrology and rainwater chemistry, and systematic collection of data for both Cl and Br. - Highlights: • δ 37 Cl in halite from arid, non-marine sedimentary basins ranges from −3 to +5.5‰. • Cl − in vadose playas may develop large isotope fractionation through cyclic wetting and drying. • Cl − in phreatic playas undergoes no fractionation as a result of cyclic wetting and drying. • Cl − in weathered

The alignment of organisation strategy and risk appetite in the financial services industry

OpenAIRE

2014-01-01

M.Com. (Business Management) This study concerns itself with the concepts of strategy, risk management and risk appetite. Strategy and risk management playa very important role in any business, but it is very difficult to determine the interrelationship between strategy and risk. There is no scientific/academic proof and there is no model or framework on what the alignment between an organisation's strategy and risk appetite is. Therefore, the purpose of this study is to develop a risk app...

Coping Flexibility: Influencing Appraisals of Stress

Science.gov (United States)

1992-09-25

organism was exposed to fear- inducing stimuli (Cannon and de la Paz, 1911 ). The substance Wsympathin", later to be named epinephrine, was identified...coping repertoire must playa role in this process. Rigid application of problem-focused coping across controllable and uncontrollable situations may...cabbage :e a splice C a steak D a paper box .::. a fish 3. To stop severe bleeding A a razor blade B a lima bean C a light bulb D a shoe E

¿La violencia doméstica es percibida por mujeres de mediana edad?

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María T Ortiz Gómez

1999-01-01

Full Text Available Se realizó un estudio en el consultorio 63-1 ubicado en la zona de Jaimanitas, municipio Playa, Ciudad de La Habana con el objetivo de evaluar la percepción que tienen las mujeres comprendidas en la etapa climatérica acerca de la Violencia Intrafamiliar (VIF. Se seleccionaron la totalidad de las féminas que transitan por esta etapa. En el estudio se utilizaron técnicas cualitativas y cuantitativas de la investigación, para las cuales se aplicó el cuestionario elaborado al efecto y el test de depresión. Se constató en esa población la presencia de mujeres ama de casa, con nivel primario, casadas, pertenecientes a familias ampliadas incompletas y que perciben la VIF en su hogar.A study was conducted at the the family physician's office 63-1 located in Jaimanitas, Playa municipality, Havana City, aimed at evaluating how climateric women perceive intrafamily violence (IFV. Most of women going through this stage were selected. Qualitative and quantitative technique of investigation were utilized in the study. A questionnarie made to this end and the depressión test were also used. Married women who were housewives and had a primary educational level were found in that population. They were part of extended incomplete families and perceived intrafamily violence (IFV at home

Seroprevalence of antibodies against the excreted antigen superoxide dismutase by Trypanosoma cruzi in dogs from the Yucatan Peninsula (Mexico).

Science.gov (United States)

López-Cespedes, A; Longoni, S S; Sauri-Arceo, C H; Rodríguez-Vivas, R I; Villegas, N; Escobedo-Ortegón, J; Barrera-Pérez, M A; Sánchez-Moreno, M; Bolio González, M E; Marín, C

2013-06-01

Numerous studies have shown the role of dogs as a reservoir for the American trypanosomiasis, as the bridge connecting sylvatic and peridomestic cycles. The objective of this study was to determine the prevalence of American trypanosomiasis in the dog population (630 sera) from seven localities in the Yucatan Peninsula (city of Mérida and the towns of Molas, Playa del Carmen, Akumal, Xcalacoop, Xcalac and Xahuachol). These data are key for developing control measures for the disease. The sera were analysed to detect antibodies against Trypanosoma cruzi, using Fe-SOD excreted as the antigenic fraction by ELISA and Western blot as confirmation. The total prevalence found in the Yucatan Peninsula was some 14.76%, with 10.74% in the state of Yucatan (city of Mérida, towns of Molas and Xcalacoop) and 21.34% in the state of Quintana Roo (towns of Playa del Carmen, Akumal, Xcalac and Xahuachol). However, a more thorough epidemiological study of the dog population, both wild and urban, in the Yucatan Peninsula will be required to design a control strategy for these diseases, paying particular attention to the population affected and even broadening the study to other Mexican states as well as neighbouring countries. These results again confirm that iron-superoxide dismutase excreted by T. cruzi constitutes a good source of antigen for serodiagnosis in epidemiological studies. © 2012 Blackwell Verlag GmbH.

Información que tienen las madres sobre algunos aspectos de la sexualidad infantil entre 0 y 4 años

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Emilia Miyar Pieiga

2001-06-01

Full Text Available Se realizó un estudio descriptivo con una muestra de 20 madres de niños con edades comprendidas entre 0 y 4 años que acudieron a consulta de pediatría o ginecología de los policlínicos "26 de Julio" y el "Docente Playa", durante el mes de abril de 1998. Se entrevistaron a estas pacientes y se les aplicó un cuestionario para buscar la información que se necesitaba. Se pudo apreciar en el estudio un alto porcentaje de madres que no tenían adecuados conocimientos sobre sexualidad en general, ni sobre sexualidad infantil, además de inadecuados enfoques de género en la formación de valores sexuales desde la infancia.A descriptive study was conducted with a sample of 20 mothers with children aged 0-4 that visited the pediatrician or gynecologist's office at the "26 de Julio" Polyclinic and at the "Playa" Teaching Polyclinic in April, 1998. These patients were interviewed and a questionnaire was applied to obtain the necessary information. It was observed a high percentage of mothers that did not have an adequate knowledge either on sexuality in general or on infantile sexuality. They also had inappropiate gender approaches as regards the formation of sexual values since childhood.

The role of large arthropods in the development of halomorphic soils in the south of Siberia

Science.gov (United States)

Mordkovich, V. G.; Lyubechanskii, I. I.

2017-06-01

Soil sequences along catenas crossing the peripheral parts of shallow-water drying lakes in the south of Siberia have been studied. They include the sulfidic and typical playa (sor) solonchaks (Gleyic Solonchaks), playa solonchak over the buried solonetz (Gleyic Solonchak Thapto-Solonetz)), shallow solonetz-solonchak (Salic Solonetz), and solonetzic and solonchakous chernozemic-meadow soil (Luvic Gleyic Chernozem (Sodic, Salic)). This spatial sequence also represents a series of historical stages of the development of halomorphic soils: the amphibian, hydromorphic, semihydromorphic, and automorphic-paleohydromorphic stages. During all of them, the biogenic component plays a significant role in the matter budget of halomorphic soils. The diversity, number, and functional activity of large insects and spiders are particularly important. Their total abundance in the course of transformation of the halomorphic soils decreases from several thousand to about 100 specimens/(m2 day), whereas their species diversity increases from 17 to 45 species. Changes in the functional structure of the soil zoocenosis and its impact on the character and intensity of pedogenetic processes can be considered driving forces of the transformation of hydromorphic soils. This is ensured by the sequential alteration of the groups of invertebrates with different types of cenotic strategy and different mechanisms of adaptation to biotic and abiotic components of the soil in the course of the development of the soil zoocenosis.

Uranium and Molybdenum extraction from a Cerro Solo deposit ore

International Nuclear Information System (INIS)

Becquart, Elena T.; Arias, Maria J.; Fuente, Juan C. de la; Misischia, Yamila A.; Santa Cruz, Daniel E.; Tomellini, Guido C.

2009-01-01

Cerro Solo, located in Chubut, Argentina, is a sandstone type uranium-molybdenum deposit. Good recovery of both elements can be achieved by acid leaching of the ore but the presence of molybdenum in pregnant liquors is an inconvenient to uranium separation and purification. A two steps process is developed. A selective alkaline leaching of the ore with sodium hydroxide allows separating and recovering of molybdenum and after solid-liquid separation, the ore is acid leached to recover uranium. Several samples averaging 0,2% uranium and 0,1% molybdenum with variable U/Mo ratio have been used and in both steps, leaching and oxidant reagents concentration, temperature and residence time in a stirred tank leaching have been studied. In alkaline leaching molybdenum recoveries greater than 96% are achieved, with 1% uranium extraction. In acid leaching up to 93% of the uranium is extracted and Mo/U ratio in solvent extraction feed is between 0,013 and 0,025. (author)

Narrativas etnográficas sobre ballenas y balleneros en las costas de Chile

OpenAIRE

Quiroz, Daniel; Carreño, Gastón

2017-01-01

Resumen: La historia de la caza comercial de ballenas en Chile permite distinguir la presencia de tres tradiciones balleneras foráneas, que denominamos "yanqui", "noruega" y "japonesa", que se instalan sobre una tradición preexistente: la caza pasiva o el procesamiento de ballenas varadas en las playas, realizado no sólo por los pueblos originarios sino también por los europeos y sus descendientes. Este montaje de tradiciones configura una secuencia de procesos sobrepuestos que ha sido narrad...

Evaluación Rápida del Ecosistema Marino Desarrollado en la Zona de Carga de la Planta Pampa Melchorita de Perú LNG.

OpenAIRE

Chamorro, Alan; Contreras, Christian; Raschio, Giancarlo

2014-01-01

La Planta Pampa Melchorita de Perú LNG se establece sobre un ecosistema costero árido el cual limita por el oeste con un acantilado rocoso y cuyas condiciones ambientales corresponden a un ecosistema marino con playas, un litoral rocoso y una zona pelágica; las tres sub-unidades han sufrido modificaciones físicas, donde estas modificaciones podrían haber generado variaciones en la biodiversidad local. El principal objetivo del presente estudio es describir las principales características b...

Valoración económica ambiental del Parque Nacional Mochima de Venezuela

OpenAIRE

Álvarez Campero, Raul Iván

2016-01-01

El Parque Nacional Mochima de Venezuela cuenta con numerosas áreas recreativas con inmenso potencial turístico, y recreativo. Las áreas turísticas – recreativas del Parque Nacional Mochima consisten fundamentalmente en sus playas de gran belleza las cuales son visitadas por diversos tipos de turistas, quienes acceden a las mismas mediante transporte acuático en botes particulares, o contratados a empresas. A pesar de todo ese potencial turístico y sus bellezas naturales, el Parque Nacional...

Direct and indirect dating of gypsum occurrences in deserts using luminescence methods

International Nuclear Information System (INIS)

Nagar, Y.C.; Juyal, N.; Singhyi, A.K.; Kocurek, G.; Wadhawan, S.K.

2005-01-01

In the present study we have made an attempt to directly date gypsum or provide indirect age estimate for gypsum formation through dating the associated sediments (quartz) using the luminescence dating technique. In the direct dating of gypsum, we explored the Optically Stimulated Luminescence (OSL) and Thermally Stimulated Luminescence (TL) behaviour of gypsum. The associated sediments (indirect dating) were dated using the traces of quartz extract from gypsum (concentration 0.1% ) and the underlying and overlying quartz sand in playa

El Puerto de La Laja (Huelva, como Bien de Interés Cultural en la categoría de Sitio Histórico

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Emilio Romero Macías

2010-01-01

de sol y playa para el conocimiento de otras culturas y como plan dinamizador de zonas que han sido afectadas por el declive de la minería en nuestra provincia. Parte del poblado del Puerto de La Laja se encuentra actualmente rehabilitado para su explotación como turismo rural, por lo que la arquitectura en cierto modo ha tratado de conjuntar la antigua disposición de las casas con las mejoras realizadas para este tipo de uso.

El asma bronquial y su asociación con los cambios de tiempo The bronchial asthma and its association with the changes in the weather

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Tatiana de la Vega Pazitková

2010-12-01

Full Text Available INTRODUCCIÓN: el clima y el estado del tiempo influyen sobre la salud humana. El asma es una enfermedad psicosomática que constituye un problema de salud mundial, y es conocida la influencia de los factores ambientales en la aparición de las crisis de asma bronquial. OBJETIVOS: determinar los picos máximos de ocurrencia de las crisis de asma bronquial, en el municipio Playa, relacionándolas con los cambios meteorotrópicos. MÉTODOS: se recogió el total de personas que acudieron, diariamente, a los servicios de urgencia de los 9 policlínicos del municipio Playa, por crisis de asma bronquial, según hojas de cargo y reportes de la unidad de análisis y tendencias de salud municipal, entre el 1ro. de enero de 2007 y el 31 de diciembre de 2008. El dato recogido, acerca de la concurrencia de dichos pacientes, se contrastó con la información aportada por los mapas de modelos biometeorológicos. Se confeccionaron gráficos de frecuencia de casos, por día y por mes. Se realizaron intervalos para el histograma, y se ubicaron las diferentes policlínicas de acuerdo con los intervalos de frecuencia con que los pacientes acudieron a recibir los servicios de salud. RESULTADOS: bajo condiciones de hiperoxia atmosférica, la ocurrencia diaria de la enfermedad, mostró un valor igual o superior a 150 % de la media mensual respectiva, por lo que se evidenció una respuesta meteoro-patológica masiva de la población estudiada. CONCLUSIONES: los efectos meteorotrópicos asociados a los cambios bruscos del estado del tiempo pueden provocar impactos deletéreos sobre la salud humana.INTRODUCTION: the climate and the weather state influenced on the human health. The asthma is a psychosomatic disease which is a world health problem and it is known the influence of environmental factors on the appearance of bronchial asthma crises. OBJECTIVES: to determine the occurrence maximal peak of bronchial asthma crises in the Playa municipality relating it to the

Carbon budget in the eastern and central Arabian Sea: An Indian JGOFS synthesis

Digital Repository Service at National Institute of Oceanography (India)

Sarma, V.V.S.S.; Swathi, P.S.; DileepKumar, M.; PrasannaKumar, S.; Bhattathiri, P.M.A.; Madhupratap, M.; Ramaswamy, V.; Sarin, M.M.; Gauns, M.; Ramaiah, N.; Sardessai, S.; DeSousa, S.N.

of its unique monsoon-driven, dynamic, and complex biogeochemistry. The JGOFS (India) I HydfOsphcric-!\\tlllosphcri<: Research Center. Nagoya University, Nagoya, Japan. 2CS1R Centre ti.1r 'Aathcmutical 'Aodeling and Computer Simulation, Banr,alore-: India... while it was between 161 and 203 mg m J in SWM (M. Ciauns et aI., Mierozooplankton playa major role in the food web dynamics of the Arabian Sea, submitted to ,Marine Ecologt, Progress Series, 2002) (hereinafter referred to as Gauns et aI., submitted...

Protección del tramo de costa «La Guardia La Restinga» en Venezuela. 3:: Soluciones

OpenAIRE

Córdova López, Luis Fermín; Torres Hugues, Ronnie

2013-01-01

Una vez que se ha analizado en trabajos anteriores el comportamiento del oleaje, las corrientes y el transporte de sedimentos en el tramo costero «La Guardia La Restinga», en el cual se está produciendo una acelerada erosión de la playa, se plantean un grupo de acciones costeras para satisfacer las demandas realizadas por el Ministerio del Ambiente de este territorio. Las modificaciones en cuanto a la dinámica costera ocasionadas por estas obras son descritas en este trabajo. Behaviour of ...

El turismo rural como experiencia significativa y su estudio desde la fenomenologia existencial

OpenAIRE

Baltazar Bernal, Obdulia; Zavala Ruiz, Jesús

2015-01-01

El turismo rural es una moda ante la crisis del turismo masivo, estandarizado de sol y playa que no tiene una definición consensuada mundialmente porque lo rural tiene variadas significaciones. Primero, se hace un análisis etimológico del término "turismo rural", se propone una definición ampliada para el contexto mexicano como "turismo ranchero" y se exhibe un concepto multidimensional: económico, gerencial y fenomenológico. Luego, se esboza un marco de referencia desde una perspectiva fenom...

La conformación de una frontera interna en las riberas del Tesechoacán

OpenAIRE

Hoffmann , Odile; Palma , Rafael

2009-01-01

El capítulo trata de visualizar la lenta construcción regional en el Sur veracruzano, subrayando aquellos procesos históricos que intervienen en la configuración del municipio de Playa Vicente hasta llegar a su singular geografía actual. La diferenciación intra-regional fue un motor muy importante para los variados pulsos de colonización, esfuerzos que terminaron por incidir en las distinciones internas que hoy privan en el municipio: distinciones entre espacios poblados de otros despoblados,...

VALORACIÓN ECONÓMICA AMBIENTAL SEGÚN LA DISPONIBILIDAD A PAGAR POR EL TURISMO RURAL VIVENCIAL EN LA ISLA TAQUILE - PERÚ, 2013

OpenAIRE

Cayo Velasquez, Noemí Emperatriz

2014-01-01

La investigación tiene como finalidad determinar la valoración económica ambiental a partir de la disponibilidad a pagar de los turistas que realizan turismo rural vivencial en la isla de Taquile, de manera que permita conservar el medio ambiente y los espacios naturales, que actualmente se encuentran en riesgo de deterioro y contaminación; asimismo se reportan los recursos turísticos existentes en la isla de Taquile: el lago Titicaca, playas, orillas y muelles donde subyacen rasgos excepcion...

Dary a firemní filantropie

OpenAIRE

Zábranská, Žaneta

2008-01-01

This thesis deals with gifts, firstly with their general concept and secondly with donations and corporate philanthropy. The last part of thesis is dedicated to research the opinions on corporate philanthropy. Gifts playa major role in society. Their key role is to create a moral obligation between a donor and a recipient. There is always somebody who is obliged, but both parties can have the different view about the size of the debt and about the time to pay it back. There can be a reciproci...

Secuencias ópalo-arcillosas en zonas de borde de lago (Vicálvaro, cuenca del Tajo).

OpenAIRE

Bustillo, Mª Ángeles; Capitán, Javier

1990-01-01

El estudio petrológico y sedimentológico de las rocas opalinas de la Unidad Intermedia (Aragoniense Medio-Superior) en los alrededores de Vicálvaro ha determinado la existencia de dos tipos diferentes de manifestaciones silíceas: niveles opalinos a techo de secuencias de somerización (silcretas de playa-Iake) y formaciones nodulares en facies distales de abanicos aluviales. Las secuencias de somerización son definidas por dos términos generales (A y B), con sus pasos intermedios o de trans...

Calidad del agua de mar y su conocimiento por turistas nacionales: el caso de tres municipios costeros del estado de Nayarit, México.

OpenAIRE

Antonio Romualdo Márquez González; Sara Rubí Tovar Hernández; Verónica Alejandra Mondragón Jaimes

2017-01-01

El objetivo de este trabajo es saber si los turistas nacionales conocen la calidad bacteriológica del agua de mar de los sitios que visitaban en los municipios de San Blas, Compostela y Bahía de Banderas del estado de Nayarit. El estar oportunamente informados de los comunicados que emiten las autoridades ambientales y de salud, sobre la calidad del agua de mar de los principales destinos de playa y que podría representar una herramienta de suma importancia para planear el desplazamiento para...

Calidad del agua de mar y su conocimiento por turistas nacionales: el caso de tres municipios costeros del estado de Nayarit, México.

OpenAIRE

Márquez González, Antonio Romualdo; Tovar Hernández, Sara Rubí; Mondragón Jaimes, Verónica Alejandra

2017-01-01

Resumen El objetivo de este trabajo es saber si los turistas nacionales conocen la calidad bacteriológica del agua de mar de los sitios que visitaban en los municipios de San Blas, Compostela y Bahía de Banderas del estado de Nayarit. El estar oportunamente informados de los comunicados que emiten las autoridades ambientales y de salud, sobre la calidad del agua de mar de los principales destinos de playa y que podría representar una herramienta de suma importancia para planear el desplazamie...

Relaciones polen-vegetación de algunos taxa de la estepa patagónica (Argentina Pollen-vegetation relationships of some taxa from the Patagonian steppe (Argentina

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LIDIA S. BURRY

2001-06-01

Full Text Available La aplicación de un análisis de regresión lineal simple a datos de lluvia de polen y de vegetación, en una zona de la Patagonia (Provincia de Chubut, Argentina permitió relacionar cuantitativamente los porcentajes de lluvia polínica y de cobertura de la vegetación para los taxa Poaceae, Papilionoideae, tipo Senecio y Mulinum spinosum. Se obtuvo un buen ajuste de las rectas de regresión para cada uno de los taxa considerados, con coeficientes de correlación r de Pearson altos para M. spinosum (0,82 y tipo Senecio (0,81 y coeficientes algo menores en el caso de Poaceae (0,66 y Papilionoideae (0,61. Estas regresiones permitieron inferir la presencia o ausencia de polen regional y el valor predictivo de la presencia de polen en ausencia de la vegetación que lo produce. Al respecto, la lluvia de polen estudiada incluye el aporte regional (excepto Papilionoideae aun cuando M. spinosum tiene una baja contribución. Esta sobrerrepresentación es atribuible al transporte de larga distancia, a través de los vientos que provienen del oeste. Estas relaciones cuantitativas nos permitirán extrapolar cambios vegetacionales pasados en estos taxa a partir de espectros de polen fósil para el área de estudioThe use of simple linear regression to data of pollen rain and vegetation cover in Patagonia (Province of Chubut, Argentina allowed us to develop quantitative relationships between modern pollen rain perecentages and vegetation cover for the taxa Poaceae, Papilionoideae, Senecio type, and Mulinum spinosum. The analysis revealed a good fit of data to regression lines for all taxa, with high Pearson r coefficient values in the case of M. spinosum (0.82 and Senecio type (0.81, and somewhat lower values in the case of Poaceae (0.66 and Papilionoideae (0.61. These regressions allowed us to infer the presence or absence of regional pollen and predict the quantity of pollen in the absence of the vegetation producing it. In this regard, the studied pollen

Importancia del estudio del balance del contenido vaginal (BACOVA en el control preventivo de las trabajadoras sexuales Importance of studying the balance of vaginal content (BAVACO in the preventive control of sex workers

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Romina Bologno

2011-12-01

Full Text Available El objetivo de este trabajo fue estudiar a un grupo de 229 trabajadoras sexuales de Comodoro Rivadavia (Chubut, atendidas en centros públicos de salud de dicha ciudad, mediante la aplicación del método conocido como balance del contenido vaginal (BACOVA. Este método comprende el estudio morfológico de la microbiota vaginal, como así también de la reacción infamatoria. Incluye el análisis del contenido vaginal en fresco y por tinciones de Gram y de Giemsa, de modo de integrar la exploración de todo el panorama biológico. El 35,37 % de estas mujeres presentó microbiota normal (MN; el 15,72 %, microbiota intermedia (MI; el 23,14 %, vaginosis bacteriana (VB y el 10,48 %, vaginitis microbiana inespecífca (VMI. Los casos de vaginitis por levaduras y por Trichomonas vaginalis comprendieron el 8,30 % y 6,99 % de las mujeres, respectivamente. Se observó el desplazamiento de la MN hacia una MI, que se correspondió con el predominio de bacterias corineformes. Por otra parte, no se reconoció un marcado desequilibrio del contenido vaginal ante la colonización e infección por levaduras o por T. vaginalis: el 48 % de los casos de estas vaginitis convencionales no presentaron reacción infamatoria vaginal (RIV. El 24,89 % de los casos de MN presentaron una signifcativa RIV, y en más del 50 % de las mujeres se diagnosticaron disfunciones vaginales en ausencia de sintomatología. Estos resultados se podrían asociar a un incremento del riesgo gineco-obstétrico, lo que afecta la salud sexual y reproductiva de la población estudiada.The aim of this work was to study the vaginal microenvironment in sex workers from Comodoro Rivadavia, Chubut. For that purpose, BAVACO procedures were applied. A total of 229 female sex workers attended public health centers. Vaginal secretions were analyzed by Gram and Giemsa stains. The following results were obtained: normal microbiota 35.37 %, intermediate microbiota 15.72 %, bacterial vaginosis 23

WITHDRAWN: The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?

Science.gov (United States)

Rodríguez, C.; Aragón, E.; Castro, A.; Pedreira, R.; Sánchez-Navas, A.; Díaz-Alvarado, J.; D´Eramo, F.; Pinotti, L.; Aguilera, Y.; Cavarozzi, C.; Demartis, M.; Hernando, I. R.; Fuentes, T.

2017-10-01

The publisher regrets that an error occurred which led to the premature publication of this paper. This error bears no reflection on the article or its authors. The publisher apologizes to the authors and the readers for this unfortunate error in Journal of South American Earth Sciences, 78C (2017) 30 - 60, http://dx.doi.org/10.1016/j.jsames.2017.06.002. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal

Effects of solar ultraviolet radiation (UVR) on molecular diversity of plankton from the Chubut rivers estuary

International Nuclear Information System (INIS)

Manrique, J.M.; Halac, S.; Calvo, A.Y.; Villafane, V.; Jones, L.R.; Helbling, W.E.

2010-01-01

Within the framework of a project designed to evaluate the impact of UVR upon estuarine plankton, we present here a molecular analysis of plankton diversity. Water samples were exposed to three radiation treatments (PAR, PAR + UV-A and PAR + UV-A + UV-B) in microcosms for ca 10 days during the Austral summer. At the beginning (t 0 ) and at the end of the experiment samples were filtered 0 through 20, 10, 5 and 0.22 μm pore sizes. The DNA amount retained in each filter indicated that most of the plankton biomass was in the 0.22-5 μm fraction at t0. In contrast, at the end of the experiment this proportion changed according to the radiation treatment and big cells (> 20 μm) dominated. An rDNA library was obtained from the DNA corresponding to the 0.22-5 μm fraction. There was no relationship between treatments and the number and frequency of restriction genotypes. Analyses of 27 clones fraction from t 0 indicated the presence of three genera of Rhodobacteraceae, one genus of Rhodospirillaceae, one SAR11 genus, one genus of Bacillaceae, an unclassified sequences of Alphaproteobacteria, Actinobacteria and Rhodospirillaceae. Also, there were six sequences similar to Ostreococcus tauri (Mamiellales). Even though the sequence analyses are still ongoing, our initial data suggest a big impact of UV-B radiation in the amount and composition of the plankton community towards big cells. (authors)

GEOLOGICAL FEATURES OF NEOGENE BASINS HOSTING BORATE DEPOSITS: AN OVERVIEW OF DEPOSITS AND FUTURE FORECAST, TURKEY

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Cahit HELVACI

2015-12-01

hydroboracite are present in west Anatolia, Death Valley, California, and Sijes (Argentina. Quaternary borates are present in salars (Andes and playa- lakes and salt pans (USA-Tibet. Boron is a rare element in the Earth’s crust, but extraordinary concentrations can be found in limited places. The formation of borate deposits can be classified as follows: a skarn group associated with intrusives and consisting of silicates and iron oxides; a magnesium oxide group hosted by marine evaporitic sediments; and a sodium– and calcium–borate hydrates group associated with playa-lake sediments and explosive volcanic activity. Some conditions are essential for the formation of economically viable borate deposits in playa-lake volcano-sedimentary sequences: formation of playa-lake environment; concentration of boron in the playa lake, sourced from andesitic to rhyolitic volcanics, direct ash fall into the basin, or hydrothermal solutions along graben faults; thermal springs near the area of volcanism; arid to semi-arid climatic conditions; and lake water with a pH of between 8.5 and 11. A borate is defined as any compound that contains or supplies boric oxide (B2O3. A large number of minerals contain boric oxide, but the three that are most important from a worldwide commercial standpoint are borax, ulexite, and colemanite, which are produced in a limited number of countries. Turkey has the largest borax, ulexite and colemanite reserves in the world and all the world’s countries are dependent upon the colemanite and ulexite reserves of Turkey. Most of the world’s commercial borate deposits are mined by open pit methods. Brines from Searles Lake, and presumably the Chinese sources, are recovered by either controlled evaporation or carbonation. Boric acid is one of the final products produced from most of the processes. Further research on the mineralogy and chemistry of borate minerals and associated minerals will the production and utilization of borate end-products. �

Análisis multicriterio del impacto potencial del turismo en la anidación de las tortugas marinas en Chalacatepec, Jalisco

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Y. Flores-Monter

2015-01-01

Full Text Available Introducción: El litoral mexicano presenta hábitats aptos para la reproducción, refugio y crianza de tortugas marinas. Sin embargo, en la costa Chalacatepec, Jalisco, esta aptitud puede estar amenazada por el Proyecto Desarrollo Vistas (PDV, un complejo turístico mixto: hotelero, residencial, comercial y deportivo. El objetivo de la presente investigación, es evaluar el impacto potencial del turismo sobre la anidación de tortugas en dos etapas: a Preparación y construcción y b Operación y mantenimiento, como una herramienta de ayuda a la toma de decisiones en la conservación de las especies Lepidochelys olivácea (tortuga golfina, Chelonia agassizii (tortuga prieta y Dermochelys coriácea (tortuga laúd. Método: Se calculó la densidad de anidación (nidos por kilómetro y se utilizó el método de evaluación multicriterio (EMC discreto Proceso Analítico Jerárquico (PAJ, para estimar el impacto de 8 amenazas turísticas: desmonte y despalme, excavaciones, rellenos, contaminación sonora, residuos sólidos, presencia de personal de obra y construcciones provisionales, iluminación artificial del frente de playa y concentración de visitantes. Se construyó una matriz de comparación, se asignó un peso a cada amenaza, y mediante el uso de un SIG se generaron los mapas de impacto potencial del turismo. Resultados: Las amenazas con mayor peso o ponderación (eigenvector total fueron los rellenos (0.36482 y la concentración de visitantes (0.38194. La construcción y operación turística puede afectar el 59.8% de las anidaciones e impactar principalmente en la costa sur el km 1 (1 142 registros de nidos colectados y, en la costa norte el km 1 (329 nidos, km 3 (311 nidos, km 4 (268 nidos y km 5 (151 nidos. Discusión o Conclusión: La playa de anidación en Chalacatepec es de gran importancia para la protección y conservación de las tortugas marinas. La presente EMC fue una herramienta adecuada para estimar las consecuencias del

Imágenes icónicas. Contrastes en la representación audiovisual del ‘pequeño Aylan’ en el periodismo televisivo español y europeo

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Estrella ISRAEL-GARZÓN

2017-07-01

Full Text Available El objetivo de esta investigación es la realización de un análisis contrastivo de la cobertura televisiva de un acontecimiento dramático y de carácter global: la representación audiovisual de un naufragio en las costas de Turquía y, en particular, la recogida en la playa de Bodrum del cuerpo sin vida de un niño sirio de tres años llamado Aylan Kurdi. Su muerte se contextualiza en la huida desesperada de miles de personas hacia Europa, a través de un mar Mediterráneo donde muchos se han dejado la vida. Este estudio reúne las noticias emitidas, en la segunda edición de noche, de los informativos de las cinco grandes cadenas generalistas en España: Telecinco, Cuatro, Antena 3, La Sexta y TVE 1, y compara los resultados con el tratamiento ofrecido en tres televisiones europeas: RAI 1, France 2 y ARD. Como conclusión general, se observa un énfasis acusado, en el uso de la imagen del pequeño sobre la playa, en el marco de un relato más emotivo que informativo. Estamos ante un hecho que trasciende el acontecimiento para convertirse en un icono global, donde Aylan se eleva al rango de símbolo dramático de la tragedia de los refugiados.

Hydrogeochemical and stream-sediment survey (NURE). Preliminary report on the Smoke Creek Desert Basin pilot study (Nevada)

International Nuclear Information System (INIS)

1976-01-01

The Lawrence Livermore Laboratory (LLL) is conducting a hydrogeochemical and stream-sediment survey in the seven western states as part of ERDA's National Uranium Resources Evaluation (NURE) Program. The objective of this survey is to develop a geochemical data base for use by the private sector to locate regions of anomalous uranium content. Prior to wide area coverage, several pilot studies are being undertaken to develop and evaluate sampling and analytical techniques. The second through fifth of these studies were conducted in four playa basins in Nevada, selected to represent different regional geology and uranium occurrence. This study in the Smoke Creek Desert Basin, characterizes igneous surface geology with known uranium occurrences. The Smoke Creek Desert Basin is the largest of the four playa basins and contains an areaof about 2700 square kilometers (1003 square miles). The basin is bordered on the east by the Fox Hills and on the north and east by the Granite Ranges which are characterized by granite, pegmatites, and Tertiary rocks very similar to the lithology of the Winnemucca Basin boundary ranges (study UCID-16911-P-2). On the west the Desert is bordered by an area of extensive basalt flow. There is no known uranium occurrence in the area, and metallization of any kind is scarce. This study is applicable to the western igneous portion of the Basin and Range Province which includes southeastern Oregon, western Nevada, and southeastern California. This report contains only analytical data and sample locations

AVALIAÇÃO DE METODOLOGIA DE AQUISIÇÃO DE DADOS PARA REPRESENTAÇÃO DE FEIÇÕES MORFOLÓGICAS DE PRAIAS ARENOSAS ATRAVÉS DE MODELO DIGITAL DE ELEVAÇÃO

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André Luis Silva dos Santos

2015-01-01

Full Text Available En el litoral septentrional de Rio Grande do Norte (RN la dinámica costera ha sido analizada a partir de la comparación multitemporal de Modelos Digitales de Elevaciones (MDE generados por método geodésico basado en el posicionamiento y en la altimetría GNSS en relación al Sistema Geodésico Brasileño (SGB. Eso tiene posibilitado la mensuración de las alteraciones morfológicas de corta duración (intranual en escala regional. Para validar el nivel de confiabilidad de la metodología geodésica, ha sido realizado un estudio de caso en la playa de Soledade, Macau/RN, en que el método geodésico fue comparado con el topográfico a partir de la medición de distancias y ángulos, considerados como referencias. En el análisis cualitativo, se observó que los dos modelos presentaran sensibilidad para representar las características morfológicas de las playas del área de estudio. Cuantitativamente, las distinciones de las altitudes ortométricas obtenidas en relación a las de referencia, en nueve puntos de control externos, tuvieron precisión decimétrica en los dos modelos, con media de -0,244m para el método topográfico y 0,139m para el método geodésico.

Prevalencia de sífilis congénita en tres hospitales públicos de Baja California, México, 2012-2015

OpenAIRE

Jorge Luis Arellano-Estrada; Cinthia Selene López-Lara; Erendida Barreras-Valenzuela

2017-01-01

Señor editor: Presentamos los resultados de un estudio descriptivo con base en datos de estudio epidemiológico (EE) de caso para sífilis congénita (SC). El formato contiene antecedentes, síntomas, evolución y asociación con factores de riesgo (FR) del binomio madre-hijo. El análisis se basa en identificar la prevalencia de SC en los Hospitales de la Secretaría de Salud (SSa) de los municipios de Tijuana, Playas de Rosarito y Tecate, Baja California, de 2012 a 2015.

Análisis morfológico y sedimentológico de la llanura aluvial entre Orpesa y la Ribera de Cabanes

OpenAIRE

Segura Beltrán, Francisca S.; Sanjaume Saumell, Eulalia

1986-01-01

Este estudio analiza, por u na parte, algunos aspectos sedimentológicos y mineralógicos de los co­nos aluviales del Xinxilla y del Barranc de la Font del Campello y, por otra, los sedimentos playeros situados entre el extremo meridional de la marjal de Torreblanca y la zona del Morro de Gas (Orpe­sa), con el fin de poder determinar la mayor o menor importancia de los materiales continentales, tanto en la formación de la llanura costera como en la composición de la playa actual. Los sedim...

Libro rojo de los invertebrados marinos de Colombia.

OpenAIRE

2002-01-01

La fauna de invertebrados marinos continúa recibiendo menos atención que la de los terrestres y de agua dulce, como un reflejo de sus amplios Rangel 1995, Chaves y Arango 1998). En el mar Caribe, el país cuenta con 1600 km de costa y en el océano Pacífico con 1300 km, en donde se encuentra una gran diversidad de ecosistemas marinos y costeros como los arrecifes coralinos, manglares y bosques de transición, sistemas de playas y acantilados, estuarios, deltas y lagunas costeras, lechos de pasto...

Devonian lacustrine shore zone architecture imaged with ground penetrating radar

DEFF Research Database (Denmark)

Andrews, Steven D.; Moreau, Julien; Archer, Stuart

. The shore zone sandstones overlie playa facies which contain abundant desiccation horizons, reflecting the most arid phase in the climatically controlled lacustrine cycle. As climatic conditions ameliorated the rejuvenation of fluvial systems resulted in the transport of sand out into the basin. Initial...... deposition was limited to intermittent events where sediment was laid down on a water saturated substrate. Some of these may have occurr­­­ed subaqueously as small scale turbidity flows. High resolution fluctuations in lake level resulted in periodic short lived reworking events along the lake margin which...

El turismo de naturaleza en espacios naturales. El caso del parque regional de las Salinas y Arenales de San Pedro del Pinatar

OpenAIRE

Ballesteros Pelegrín, Gustavo Alfonso

2014-01-01

Los espacios naturales atraen a turistas que buscan el contacto con la naturaleza, surgiendo nuevos productos turísticos. Surgen, de este modo, nuevos productos turísticos. En la oferta de turismo de naturaleza del Parque Regional de las Salinas y Arenales de San Pedro del Pinatar destaca: deportes en la naturaleza, aventura y ecoturismo. Este último se divide en: turismo ornitológico y fotográfico, que junto al tradicional de sol y playa y de salud, se ve favorecido por su situación geográfi...

Revisión de registros y notas de Pingüino Rey (Aptenodytes patagonicus) y el Pingüino Penacho Amarillo (Eudyptes chrysocome) en Brasil

OpenAIRE

Barquete, Viviane; Bugoni, Leandro; Silva-Filho, Rodolfo P.; Adornes, Andrea C.

2006-01-01

En este estudio se presenta una revisión de hallazgos previos y nuevos registros del Pingüino Rey (Aptenodytes patagonicus) y del Pingüino Penacho Amarillo (Eudyptes chrysocome) en la costa de Brasil. En total se registraron seis individuos de Pingüino Rey y diez de Pingüino de Penacho Amarillo. Tanto juveniles como adultos de las dos especies fueron encontrados en las playas, especialmente en Rio Grande do Sul, sur de Brasil. Los registros de Pingüino Rey están restringidos al verano, mientr...

Quality-Assurance Plan for Water-Quality Activities of the U.S. Geological Survey in Miami, Florida

Science.gov (United States)

2003-01-01

Jacqueline Lima GS-12 GS-10 GS-09 GS-09 GS-08 GS-07 GS-06 GS-06 GS-04 GS-04Eleanor Seymore Surface-Water Data Collections & Jon Woolverton Jorge Agis...Thomas J. Smith, III Gordon Anderson Kevin Whelan Don De Angelis Allison Snow GS-13 GS-07 GS-05 GS-12 GS-13 GS-07 GS-12 GS-13 GS-09 GS-07 GS-14 GS-07...fan, active, inactive, inventory only playa , month day year stream channel, digital rec- order, North American Datum of 1927 North American Datum of

Final Environmental Impact Statement MX: Buried Trench Construction and Test Project.

Science.gov (United States)

1977-11-01

is part of the playa area of San Cristo - bal Wash. 12 SEE FVtJ.E 9, FO V ftL ENTRANCE RAMP’Y- SEE FIGURE 10 FOR DETAIL PROPOSED SHORT SECTION OF BURIED...COUNTY MARICOPA COUNTY . MOUNT PERENT AMOUNT PERCENT AMOUNT PERCENT AMOUNT PERCENT Aqrtculture 5.5 23.1 10.1 2.3 5.1 21.9 10.3 2.3 Mining and 2uarrying...evening are being recorded verbatim by Miss Christy Olesek, a qualified Court Reporter. Now the transcript of the hearing will be forwarded to the

Enfermería extrahospitalaria: Actuación en las lesiones por animales marinos.

OpenAIRE

Carmona Simarro, J.V.; Villalba Lizandra, N.

2003-01-01

Año tras año, durante los veranos, comprobamos cómo la incidencia de lesiones por la acción de los animales marinos ha sido significativa en toda la costa Mediterránea, asociada al aumento de la temperatura. La mejoría en la calidad de las aguas de las playas, el buen tiempo y el turismo han provocado que prácticamente durante los meses de julio, agosto y septiembre, éstas hayan estado casi llenas, lo que ha provocado una incidencia mayor de lesiones por los animales marin...

CUANTIFICACIÓN DE CARBOHIDRATOS, POLIFENOLES Y SULFATOS EN EXTRACTOS DE MACROALGAS PROMISORIAS PARA LA ACUICULTURA

OpenAIRE

Salas, N.; Lengua, R.; Becerra, E.; Bazán, D.; Santome, S.; Córdova, C.

2015-01-01

En el presente trabajo, se  determinó el contenido de Carbohidratos, polifenoles y  sulfatos en muestras de macroalgas marinas, las que se recolectaron en la  Bahía de Pisco-Ica y  en la  playa de Barranco. Las muestras estudiadas son las siguientes:    Macrocystis Pyrifera, Ulva Nematoidea, Lessonia Trabeculata, Chondracanthus Chamissoi. Se observó que el alga     Chondracanthus Chamissoi  femenina  es la que tiene mayor cantidad de carbohidratos,  el   alga Macrocystis Pyrifera  es la que  ...

Nuevos registros de hongos marinos en el litoral sur de Guantánamo, Cuba

OpenAIRE

Samón Legrá, E.; Enríquez Lavandera, D.

2010-01-01

Por primera vez se realizó la identificación de hongos marinos filamentosos aislados en cuatro playas del litoral sur de la provincia de Guantánamo, Cuba. Para el aislamiento de los hongos se empleó el método indirecto de incubación de sustratos vegetales en cámara húmeda. Se describieron 25 especies de hongos marinos: 18 ascomicetes, seis hongos mitospóricos y un basidiomiceto. De las especies descritas, seis constituyen nuevos registros para el país. Con estos resultados, el número total de...

Un soldado de Cristo. Recuerdo y aventura de Monseñor Luis Irazi

Directory of Open Access Journals (Sweden)

Adel López Gómez

1966-12-01

Full Text Available El mar estaba allí, junto a él -junto a nosotros- cuando volví a verle. No importa que fuese otro rincón oceánico. Que fueran otra playa, otras arenas, otros cocoteros. Era, sin embargo, su mar, compañero inmenso de su larga aventura, teatro de su batalla, eventual horizonte de su nostalgia. Allí volvía a encontrarle, con un fondo de alcatraces, de barcos pesqueros en reposo y canoas inmóviles en la inmovilidad de la bahía.

Description of floodplains and wetlands, Deaf Smith County site, Texas

International Nuclear Information System (INIS)

1986-11-01

Floodplains and wetlands are important features of the Texas Panhandle landscape, and are found on the Deaf Smith County site and in its vicinity. Use or disturbance of floodplains and wetlands in relation to the Civilian Radioactive Waste Management Program is subject to environmental review requirements implementing two Executive Orders. This report provides general information on playa wetlands in the Texas Panhandle, and describes and maps floodplains and wetlands on the Deaf Smith site and in its vicinity. The report is based on the published literature, with information from limited field reconnaissance included

Regional setting, distribution and genesis of surficial uranium deposits in calcretes and associated sediments in Western Australia

International Nuclear Information System (INIS)

Butt, C.R.M.; Mann, A.W.; Horwitz, R.C.

1984-01-01

Surficial uranium deposits in Western Australia are largely in the Yilgarn Block in areas of Archean granitoids and greenstones, and in the Gascoyne Province in Proterozoic granites and gneisses. The region has had a long weathering history marked by continuous planation developing a regolith up to 100 metres thick. The distribution of calcrete type uranium deposits is controlled by geologic as well as weathering, erosion and climatic factors. Valley, playa and terrace deposits are recognized. The principal known surficial uranium deposit, Yeelirrie, occurs in the Yilgarn block as a valley deposit. (author)

Estudio de los impactos socioculturales de la actividad turística y su incidencia sobre la comuna montañita

OpenAIRE

Coronel A., Lidice; Marquez A., Maria De Los Angeles; Ricaurte Quijano, Carla

2009-01-01

Se dice que el turismo es el futuro y que puede sacar adelante a un país, aclaración cierta, ya que el turismo tiene una gran capacidad de generar empleos o ingresos. Montañita se ha convertido en lugar de residencia para muchos turistas extranjeros que han sido cautivados por sus playas y paisajes, entre ellos jóvenes surfistas. Algunos de ellos han montando negocios como hoteles y restaurantes de estilo rústico principalmente en el centro del pueblo. Hoy en día el público predominante qu...

Consolidación de un destino turístico: Ibiza a finales del siglo XX

OpenAIRE

Cardona, José Ramón; Jiménez Caballero, José Luis (Coordinador)

2016-01-01

Ibiza es un destino turístico del Mediterráneo conocido internacionalmente por su oferta de sol y playa, sus discotecas y por la presencia de hippies en el pasado. Desde finales de los cincuenta hasta los setenta, la isla vivió un rápido crecimiento del sector turístico que tuvo impacto en los medios de comunicación. A finales de los setenta aparecieron grupos ecologistas, protestas solicitando frenar el deterioro de la isla y grupos críticos con las consecuencias del turi...

Nuevos materiales para la especiación de mercurio: biotransformación de metales en organismos modelo

OpenAIRE

Zarco Fernández, Sonia

2016-01-01

La contaminación medioambiental representa un problema de gran importancia en la actualidad. Estamos acostumbrados a escuchar por los medios de comunicación los numerosos casos que suceden a nuestro alrededor: la contaminación de ríos, lagos o playas por vertidos residuales; la contaminación de los suelos por utilización indebida de ciertos fertilizantes o por las actividades mineras de la zona; o la contaminación del aire ocasionada por el masivo número de automóviles y zonas industriales en...

Modelo Predictivo para la Permanencia en la Educación Superior

OpenAIRE

Rodríguez, Vera Montserrat; González Campos, José; Patricio Aguilera, Juan

2017-01-01

El objetivo de este trabajo es reportar el modelo multivariado predictivo para la permanencia universitaria a partir de atributos previos al ingreso a la universidad y de variables medidas durante el primer semestre de 2017 de los estudiantes de la Universidad de Playa Ancha que ingresaron a la universidad a través del Programa de Acompañamiento y Acceso Efectivo a la Educación Superior del Ministerio de Educación de Chile.El presente texto describe de manera breve el modelo de Tinto (1975). ...

Los artesanos de la luz. Boceto picassiano de Pablo Picasso

Directory of Open Access Journals (Sweden)

Hector Rojas Herazo

1966-11-01

Full Text Available En una playa de Antíbes -enérgico vaho de limoneros, de crustáceos, de fúlgidos peces entre el cobre solar- aparece Pablo Picasso. Sólido él, prieto de sí mismo, grave y concentrado, con su sólida arquitectura de toro bravo, de toro de lidia español, de toro altamirense que trae enredados en sus cuernos los primarios racimos atesorados en la caverna. Corajuda la vida de este hombre. Un primitivo peligroso. Ojos saltones, desafiantes, inquisitivos...

Ecological investigations at the Pantex Plant Site, 1992

International Nuclear Information System (INIS)

Cushing, C.E.; Mazaika, R.R.; Phillips, R.C.

1993-09-01

In 1992, Pantex requested that Pacific Northwest Laboratory (PNL) conduct a series of ecological surveys to provide baseline information for designing detailed ecological studies on the various ecosystems present at the Pantex plant site near Amarillo, Texas. To this end, PNL scientist and technicians visited the site at different times to conduct investigations and collect samples: July 6--13: birds, small mammals, general habitat assessment; August 10--14: wetland vegetation, birds, small mammals, Playa invertebrates; and September 7--11: birds, small mammals. This report presents the results of these three surveys

Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil Variación diaria y mareal de ensambles de peces en la zona de surf de una playa protegida en el sur de Brasil

Directory of Open Access Journals (Sweden)

Fabiana C Félix-Hackradt

2010-01-01

Full Text Available Diel and tidal variations of fish assemblages were assessed at Pontal beach, southern Brazil, using a seine net. Species richness was greater at night, whereas fish number, weight, and richness (cornmunity indicators were all influenced by the tidal state. Samples from rising tides were more representative, probably due to onshore fish movements for feeding purposes. However, lower catches were associated with high tides, mainly through net avoidance, indicating that sampling in these conditions is not highly informative. Clupeoids exhibited greater variation in a 24 h period, and the night occurrence of A. tricolor and daylight shoaling of Harengula clupeola, Anchoa parva and Sardinella brasiliensis suggested distinct strategies for avoiding daylight predators. In some species, this behaviour may have been induced by the bottom morphology and tidal state, facilitating nearshore grouping. In addition to being caught at night, the occurrences of Menticirrhus littoralis, Pomadasys corvinaefórmis, Umbrina coroides and Hyporhamphus unifasciatus indicated a spatial niche partition according to tidal state. Although not evaluated properly, temporal fluctuations could reflect species recruitment patterns. Seasonal fluctuations have to be considered when analysing short-term changes in the cornmunity as such fluctuations are synchronized with the natural history of the species, making it difficult to interpret short-term variations in isolation.Se utilizó una red de arrastre para evaluar la variación diaria y mareal del ensamble de peces en la playa de Pontal, sur de Brasil. Se encontró la mayor riqueza de especies durante la noche mientras que la abundancia, peso y riqueza (indicadores de la comunidad fueron influenciados por la marea. Las muestras de marea creciente fueron las más representativas debido probablemente a los movimientos costeros con fines alimentarios; sin embargo, las menores capturas estuvieron asociadas a pleamares debido a la

Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the Vermejo Project area and the Maxwell National Wildlife Refuge, Colfax County, northeastern New Mexico, 1993

Science.gov (United States)

Bartolino, J.R.; Garrabrant, L.A.; Wilson, Mark; Lusk, J.D.

1996-01-01

invertebrates. Concentrations of other elements were below their respective toxicity levels. Plants, invertebrates, fish, and fish fillets were collected and analyzed. These analyses were compared to diagnostic criteria and to each other to determine the extent of bioaccumulation of trace elements. Plants contained larger dry weight concentrations of aluminum, arsenic, boron, chromium, iron, lead, magnesium, manganese, nickel, and vanadium than invertebrates and fish. Adult brine flies, gathered from playas, contained larger geometric mean dry weight concentrations of boron, magnesium, and selenium than other invertebrates. Of all samples collected, the largest mercury concentrations were found in fish fillets, although these concentrations were below levels of concern. Mercury and selenium bioaccumulation was evident in various habitats of the study area. Biological samples from Natural playa, an endemic wetland, and Half playa, a playa that receives additional water through seepage and irrigation delivery canals, generally had elevated concentrations of boron, iron, magnesium, and selenium than samples from reservoir and river sites. Selenium concentrations were lowest in biota from the two reservoir sites, although a wetland immediately downstream from the dam impounding Lake No. 13 (created by seepage from the reservoir) had elevated concentrations of selenium in biota. The geometric mean selenium concentration of whole-fish samples, except those from Lakes No. 13 and No. 14, exceeded the 5-mg/g dry weight selenium concentration that demarcates the approximate lower limit of the threshold range of concentrations that have been associated with adverse effects on piscine reproduction. Biota collected on and in the area around Maxwell National Wildlife Refuge contained concentrations of selenium that are in the low

Fish waste as an alternative resource for gulls along the Patagonian coast: availability, use, and potential consequences

Energy Technology Data Exchange (ETDEWEB)

Yorio, Pablo; Caille, Guillermo

2004-04-01

We evaluated the volumes of waste from fish processing plants in Chubut Province, Argentina, and discuss its potential consequences for Kelp Gull (Larus dominicanus) population dynamics and coastal management. Mean volume of waste produced between 1989 and 2001 in three coastal cities was 49.8 {+-} 10.9 thousand tons y{sup -1}. The amount of waste varied between years and cities, being larger at Puerto Madryn and Comodoro Rivadavia than at Rawson (24.1, 19.3 and 6.4 thousand tons y{sup -1}, respectively). Waste was disposed at the three cities during all months of the sampled years. Large numbers of Kelp Gulls have been recorded taking advantage of fish waste disposed at these waste sites throughout the year. Considering its energetic content, waste generated at processing plants may support a population of between 101 000 and 209 000 Kelp Gulls. Fish waste could be contributing to their population expansion through increased survival and breeding success. Conflicts due to the use of waste and derived effects on other coastal species and human populations could be minimized by adequate fish waste management.

The non-nuclear legislation and the communal property

International Nuclear Information System (INIS)

Ciallella R, Norberto; Grancelli Cha, Nestor

1996-01-01

Since 1984, year in which the Bolson Municipality, Rio Negro province, declared the town a 'Non Nuclear Area', began to appear an abundant legislation that generically, it is know as 'Non Nuclear'. The provinces of Buenos Aires, Chubut, Formosa, La Pampa, Santa Cruz and Tierra del Fuego, have in their respective Constitutions non nuclear articles, while the provinces of Catamarca, Cordoba, Corrientes, Chaco, Entre Rios, Formosa, Rio Negro, San Luis, Santa Cruz, Santa Fe, Tierra del Fuego and Tucuman have sanctioned in their respective jurisdictions non nuclear laws. New projects of these laws are in consideration and treatment in the provinces of Catamarca, La Pampa, Mendoza, Santiago del Estero and Rio Negro. The present work compiles and analyzes the available information on this subject. Although the topic is not regulatory, it could have involved in the regulatory area in an eventual situation that could be presented between regulatory laws of federal and provincials reaches. This work describes the current situation and the probabilities consequences of the mentioned legislation. (author)

Selected contributions from the 9th International Conference on Tidal Sedimentology, November 2015, Puerto Madryn, Patagonia, Argentina: an introduction

Science.gov (United States)

Scasso, Roberto A.; Cuitiño, José I.

2017-08-01

This special issue of Geo-Marine Letters presents selected contributions from the 9th International Conference on Tidal Sedimentology held on 17-19 November 2015 in Puerto Madryn, Chubut Province, Patagonia, Argentina. The guest editors are the conference organizers Roberto A. Scasso and José I. Cuitiño. Gerardo M. Perillo was the head of the Scientific Committee. The conferences on tidal sedimentology have been traditionally held every 4 years. However, only 3 years separated the last conference held in Caen (France, 2012) from this conference. Increasing numbers of contributions and the growing interest in tidal sedimentation have been the reasons for shortening the inter-conference period. The 2015 conference served as a discussion forum focusing on advances in modern and ancient tidal sedimentation at different locations worldwide. The papers presented in this Special Issue provide a selective view of the latest research results, the main topics dealing with tidal hydrodynamics and sediment transport, tidal coastal morphodynamics, modern and ancient tidal sedimentation, geotechnical processes in tidal environments, and tidal basins, facies and reservoirs.

Fish waste as an alternative resource for gulls along the Patagonian coast: availability, use, and potential consequences

International Nuclear Information System (INIS)

Yorio, Pablo; Caille, Guillermo

2004-01-01

We evaluated the volumes of waste from fish processing plants in Chubut Province, Argentina, and discuss its potential consequences for Kelp Gull (Larus dominicanus) population dynamics and coastal management. Mean volume of waste produced between 1989 and 2001 in three coastal cities was 49.8 ± 10.9 thousand tons y -1 . The amount of waste varied between years and cities, being larger at Puerto Madryn and Comodoro Rivadavia than at Rawson (24.1, 19.3 and 6.4 thousand tons y -1 , respectively). Waste was disposed at the three cities during all months of the sampled years. Large numbers of Kelp Gulls have been recorded taking advantage of fish waste disposed at these waste sites throughout the year. Considering its energetic content, waste generated at processing plants may support a population of between 101 000 and 209 000 Kelp Gulls. Fish waste could be contributing to their population expansion through increased survival and breeding success. Conflicts due to the use of waste and derived effects on other coastal species and human populations could be minimized by adequate fish waste management

Radiological environmental monitoring around the mining sites in Argentina

International Nuclear Information System (INIS)

Quintana, Eduardo E.; Gomez, Juan C.; Palacios, Miguel A.

2004-01-01

The uranium mining industry began its development in Argentina in the fifties. Since then, several installations have operated as uranium underground mining until late seventies, when that mines were closed. Since then, open pit exploitation has been used. Milling facilities were installed in the mining areas or close to them. The environmental radiological surveillance and the impact assessment presented in this work are referred to the uranium ore mining and milling plants Tonco, in Salta province; Pichinan, in Chubut province; San Rafael and Malargue, in Mendoza province; Los Gigantes, in Cordoba province; La Estela, in San Luis province and Los Colorados in La Rioja province. The environmental radiological surveillance programme results carried out from the beginning of the operations are presented and include uranium and radium concentrations in surface waters and sediments. The results obtained in waters upstream and downstream the uranium mining complexes are compared and no significant differences were observed. Moreover, taking into consideration the critical exposition pathways of the population living in the area, no significant levels of exposition were observed. (author)

El patrimonio industrial petrolero en la Patagonia: Comodoro Rivadavia (Argentina y Cerro Sombrero (Chile. Una perspectiva comparada

Directory of Open Access Journals (Sweden)

Pía Acevedo Méndez

2016-01-01

Full Text Available El hallazgo de petróleo en Comodoro Rivadavia (Chubut, Argentina y en Manantiales (Tierra del Fuego, lado chileno, motivó la construcción de espacios socioproductivos bajo el modelo de Company Towns. En el caso argentino la empresa estatal Yacimientos Petrolíferos Fiscales (Y.P.F creó el Campamento Central y la Empresa Nacional del Petróleo (ENAP creó Cerro Sombrero en Chile, los que en la década de 1970 formaron dos tejidos urbanos (barrio en el caso argentino y pueblo en el caso chileno. En esta dinámica se transformó el modo de habitar de ambos espacios, que se convirtieron en potenciales elementos turísticos, teniendo en cuenta que desde el año 2014 poseen reconocimiento patrimonial relacionado con su pasado petrolero y su arquitectura moderna. El objetivo es comparar cómo ambas empresas petroleras estatales construyeron dichos espacios “urbanos” y sus comunidades sociolaborales e indagar en la relación identidad/ patrimonio de ypefeanos y enapinos.

Evaluación de la correlación entre atributos genéticos y apellidos: características de STRs autosómicos en individuos con apellido Mapuche y Europeo

Directory of Open Access Journals (Sweden)

Sala, Andrea

2006-01-01

Full Text Available Uno de los criterios de identificación vigente en los países occidentales es el determinado por el apellido. En ciertas regiones los apellidos pueden asociarse a grupos humanos definidos. Con el objeto de evaluar una posible correlación entre el origen étnico de diversas poblaciones se compararon las características genéticas de individuos cuyos apellidos incluyen elementos lingüísticos Mapuche con otros asociados a un origen europeo. En el presente trabajo se investigaron 168 individuos varones no relacionados, provenientes de las provincias patagónicas de Río Negro y Chubut, seleccionándose en cada provincia un número comparable de individuos con apellido Mapuche y europeo. Se analizaron 15 microsatélites (STRs autosómicos, ampliamente usados en identificación humana. Los resultados obtenidos indican una diferencia significativa entre el grupo Mapuche y el europeo (Fst: 0.055; p < 0,05. Los resultados de distancias genéticas sugieren que el grupo Mapuche es genéticamente distante de las poblaciones con apellido no aborigen.

The non-nuclear legislation and the communal property; La legislacion no nuclear y el bien comun

Energy Technology Data Exchange (ETDEWEB)

Ciallella R, Norberto; Grancelli Cha, Nestor

1996-07-01

Since 1984, year in which the Bolson Municipality, Rio Negro province, declared the town a 'Non Nuclear Area', began to appear an abundant legislation that generically, it is know as 'Non Nuclear'. The provinces of Buenos Aires, Chubut, Formosa, La Pampa, Santa Cruz and Tierra del Fuego, have in their respective Constitutions non nuclear articles, while the provinces of Catamarca, Cordoba, Corrientes, Chaco, Entre Rios, Formosa, Rio Negro, San Luis, Santa Cruz, Santa Fe, Tierra del Fuego and Tucuman have sanctioned in their respective jurisdictions non nuclear laws. New projects of these laws are in consideration and treatment in the provinces of Catamarca, La Pampa, Mendoza, Santiago del Estero and Rio Negro. The present work compiles and analyzes the available information on this subject. Although the topic is not regulatory, it could have involved in the regulatory area in an eventual situation that could be presented between regulatory laws of federal and provincials reaches. This work describes the current situation and the probabilities consequences of the mentioned legislation. (author)

Formation and Thermal Infrared Spectroscopy of Halite Crusts

Science.gov (United States)

Baldridge, A. M.; Christensen, P. R.

2003-12-01

Efflorescent salt crusts form as groundwater evaporates from capillary updraw of brine through sediment. Salts precipitate at the surface, coating and cementing the upper few layers of sediment. If enough brine is present to completely saturate and pond on top of the surface, halite will precipitate at the surface of the brine and settle out as layers of crystalline salt on top of the sediment. In playa environments, salts such as sulfates, carbonates and halides, and forms such crusts. In remote sensing studies of such surfaces, it is important to understand how the presence of salt crusts affects the spectral features of the surrounding sediment. This is especially true when the crusts form from a non-absorbing salt such as halite. Halite has been observed to exhibit unusual spectral properties in the thermal infrared. Specifically, granular mixtures of minerals with halite produced spectra in which the spectral features inverted form reflectivity, shifted to shorter wavelengths and the spectral contrast increased near absorption bands. However, in crusted surfaces, in which the halite cements, coats or overlays the mineral grains, the presence of halite has a different affect on the spectra. This work will examine the precipitation of halite and the formation of salt crusts for several sediment and brine mixtures. Laboratory measurements of thermal emission spectra for the crusts will be compared to previous studies for particulate mixtures of halite with minerals and well as to natural surface crusts. Detailed knowledge of such surfaces will allow for their discrimination and identification in terrestrial playa settings as well as in paleo-environments on Mars.

Origin of the Okrouhlá Radouň episyenite-hosted uranium deposit, Bohemian Massif, Czech Republic: fluid inclusion and stable isotope constraints

Science.gov (United States)

Dolníček, Zdeněk; René, Miloš; Hermannová, Sylvie; Prochaska, Walter

2014-04-01

The Okrouhlá Radouň shear zone hosted uranium deposit is developed along the contact of Variscan granites and high-grade metasedimentary rocks of the Moldanubian Zone of the Bohemian Massif. The pre-ore pervasive alteration of wall rocks is characterized by chloritization of mafic minerals, followed by albitization of feldspars and dissolution of quartz giving rise to episyenites. The subsequent fluid circulation led to precipitation of disseminated uraninite and coffinite, and later on, post-ore quartz and carbonate mineralization containing base metal sulfides. The fluid inclusion and stable isotope data suggest low homogenization temperatures (˜50-140 °C during pre-ore albitization and post-ore carbonatization, up to 230 °C during pre-ore chloritization), variable fluid salinities (0-25 wt.% NaCl eq.), low fluid δ18O values (-10 to +2 ‰ V-SMOW), low fluid δ13C values (-9 to -15 ‰ V-PDB), and highly variable ionic composition of the aqueous fluids (especially Na/Ca, Br/Cl, I/Cl, SO4/Cl, NO3/Cl ratios). The available data suggest participation of three fluid endmembers of primarily surficial origin during alteration and mineralization at the deposit: (1) local meteoric water, (2) Na-Ca-Cl basinal brines or shield brines, (3) SO4-NO3-Cl-(H)CO3 playa-like fluids. Pre-ore albitization was caused by circulation of alkaline, oxidized, and Na-rich playa fluids, whereas basinal/shield brines and meteoric water were more important during the post-ore stage of alteration.

La atención ginecológica en niñas de 0 a 10 años

Directory of Open Access Journals (Sweden)

Miguel Lugones Botell

2002-06-01

Full Text Available Se realizó un estudio retrospectivo de 150 pacientes de 0 a 10 años de edad atendidas con historias clínicas en la consulta de ginecología infantojuvenil en el municipio Playa, entre el 1ro. de septiembre de 1996 y el 30 de noviembre de 2001, y se analizaron las variables siguientes: principales motivos de consulta en relación con la edad, principales causas de leucorrea o vulvovaginitis, causas de trastornos de la pubertad y causas de dolor pelviano. Se concluyó que los principales motivos de consulta fueron la leucorrea o vulvovaginitis, los trastornos de la pubertad y el dolor pelviano. Fue la vaginosis bacteriana la principal causa de leucorrea, la telarquia precoz la principal causa de trastorno de la pubertad, y el dolor pelviano fue ocasionado en la mayoría de las niñas por giardiasis.A retrospective study of 150 patients aged 0-10 years, seen at the infant-juvenile gynecological service in Playa municipality from September 1996 to November, 2001, was made. The following variables were analyzed: main reasons for going to doctor´s in related to age, main causes of leukorrea or vulvovaginits, causes of disorders in puberty and causes of pelvic pain. It was concluded that the main reasons for going to the doctor´s were leukorrea, vulvovaginits, puberty disorders and pelvic pain. Bacterial vaginosis was the main cause of leukorrea, early telarchia was the main cause of puberty disorders whereas pelvic pain was due to giardiasis in most of the girls.

Two depositional models for Pliocene coastal plain fluvial systems, Goliad Formation, south Texas Gulf Coastal plain

International Nuclear Information System (INIS)

Hoel, H.D.; Galloway, W.E.

1983-01-01

The Goliad Formation consists of four depositional systems-the Realitos and Mathis bed-load fluvial systems in the southwest and the Cuero and Eagle Lake mixed-load fluvial systems in the northeast. Five facies are recognized in the Realitos and Mathis bed-load fluvial systems: (1) primary channel-fill facies, (2) chaotic flood channel-fill facies, (3) complex splay facies, (4) flood plain facies, and (5) playa facies. A model for Realitos-Mathis depositional environments shows arid-climate braided stream complexes with extremely coarse sediment load, highly variable discharge, and marked channel instability. Broad, shallow, straight to slightly sinuous primary channels were flanked by wide flood channels. Flood channels passed laterally into broad, low-relief flood plains. Small playas occupied topographic lows near large channel axes. Three facies are recognized in the Cuero and Eagle Lake mixed-load fluvial systems: (1) channel-fill facies, (2) crevasse splay facies, and (3) flood plain facies. A model for Cuero-Eagle Lake depositional environments shows coarse-grained meander belts in a semi-arid climate. Slightly to moderately sinuous meandering streams were flanked by low, poorly developed natural levees. Crevasse splays were common, but tended to be broad and ill-defined. Extensive, low-relief flood plains occupied interaxial areas. The model proposed for the Realitos and Mathis fluvial systems may aid in recognition of analogous ancient depositional systems. In addition, since facies characteristics exercise broad controls on Goliad uranium mineralization, the proposed depositional models aid in defining target zones for Goliad uranium exploration

Technical procedures for the implementation of cultural resource site studies, Deaf Smith County, Texas: Preliminary draft

International Nuclear Information System (INIS)

1987-01-01

Cultural resources at the Deaf Smith County site will be identified, evaluated and managed through the implementation of studies detailed in the Site Study Plan for Cultural Resources. This technical procedure outlines the conduct of pedestrian survey and the documentation of identified cultural resources. The purpose of the field surveys is to identify and document cultural resources in the areas that will be affected by site characterization activities and to record the environmental setting of identified cultural resources. Three pedestrian surveys will cover 100 percent of the on-site and off-site project areas. Survey 1 will provide coverage of the Repository Surface Facility (RSF) area, which includes the Exploratory Shaft Facility (ESF) and two linear engineering design borehole (EDBH) seismic survey corridors. Survey 2 will provide coverage of a 39 km 2 (15 mi 2 ) area that includes the 23 km 2 (9 mi 2 ) Deaf Smith County site plus a 0.4 to 0.8 kM (1/4 to 1/2 mi) border area but excludes the area covered by Survey 1. Survey 3 will cover offsite geotechnical test areas, such as the locations of playa boreholes, deep playa wells, hydrologic tests, site foundation borings, and their access routes. The purpose of site documentation or recording is to address the project information needs for land use permits and approvals, engineering design support, and cultural resource evaluation for National Register of Historic Places eligibility. Site documentation will consist of gathering sufficient data on identified resources to complete Texas Natural Resource Information System (TNRIS). 7 refs., 3 figs

National Uranium Resource Evaluation: Lovelock Quadrangle, Nevada and California

International Nuclear Information System (INIS)

Berry, V.P.; Bradley, M.T.; Nagy, P.A.

1982-08-01

Uranium resources of the Lovelock Quadrangle, Nevada and California, were evaluated to a depth of 1500 m using available surface and subsurface geological information. Uranium occurrences reported in the literature and in reports of the Atomic Energy Commission were located, sampled, and described in detail. Areas of anomalous radioactivity, as interpreted from the aerial radiometric reconnaissance survey and from the hydrochemical and stream-sediment reconnaissance survey reports, were also investigated. A general reconnaissance of the geologic environments exposed in surface outcrops was carried out; and over 400 rock, sediment, and water geochemical analyses were made from the samples taken. Additionally, 119 rock samples were petrographically studied. A total of 21 occurrences were located, sampled, and described in detail. Six uranium occurrences, previously unreported in the literature, were located during hydrogeochemical and stream-sediment reconnaissance, aerial radiometric reconnaissance survey followup, or general outcrop reconnaissance. Nine areas of uranium favorability were delineated within the Lovelock Quadrangle. One area, which contains the basal units of the Hartford Hill Rhyolite, is favorable for hydroallogenic uranium deposits. Eight areas are favorable for uranium deposits in playa sediments. These playas are considered favorable for nonmarine carbonaceous sediment deposits and evaporative deposits. The total volume of rock in favorable areas of the Lovelock Quadrangle is estimated to be 190 km 3 . The remaining geologic units are considered to be unfavorable for uranium deposits. These include upper Paleozoic and Mesozoic volcanic, plutonic, sedimentary, and metamorphic rocks. Also unfavorable are Tertiary and Quaternary volcanic flows and intrusive phases, tuffs, and sediments

Conceptual characterization of the system of fractures of the rock mass known as Sierra del Medio (Chubut)

International Nuclear Information System (INIS)

Ventura, M.A.

1990-01-01

This work characterizes conceptually the system of fractures of the rock mass known as Sierra del Medio and its surroundings. The purpose of this characterization is to define the spectra of flow regimes which must be covered in computational models to be used in the prediction of the thermohydraulic effects of the eventual emplacement of a high-level radioactive waste repository. The analysis of the available data from previous studies was performed in order to determine qualitative data to be used in the stage of feasibility studied. The flow of water roughly N-S is defined by two systems of vertical, almost orthogonal fractures and surrounded by large faults. A set of hypotheses were considered which allow, supposing a given distribution of surface fractures, to establish the variations according to depth. The usual ways of obtaining the permeability and the hydraulic conductivity in fractured porous media are summarized in an appendix. (Author) [es

The radiation stress and beaches; El tensor de radiacion y las playas

Energy Technology Data Exchange (ETDEWEB)

Lechuga Alvaro, A. [Ministerio de Fomento (Spain)

1998-06-01

In this paper we summarize the main characteristics of the radiation stress on shallow water and its relation ship with the sediment transport. After Longuet-Higguins and Stewart presented the concept and applications of the radiation stress there have been several studies showing some aspects of the integral characteristics of the wave nonlinearity. First of all we describe the radiation stress and its components when we change coordinates. Thirdly we generalize the coordinates using the differential operators in orthogonal curvilinear coordinates. The problem is strongly simplified and also is the sedimentary circulation and dynamics. A quick look at the term of the equation shows us the main characteristics of sediment transports both in deep and shallow water. Some conclusions can be drawn of it. (Author)

Relevamientos semicuantitativo para el estudio de la morfología de playa

OpenAIRE

Marcos, Angel; Fernández, Elba; Caló, Jorge; Huespe, Ricardo

2009-01-01

El cambio climático global y sus efectos sobre las ambientalmente sensibles áreas costeras han llevado, tanto a los organismos científicos como económicos, a poner en ejecución planes de manejo costero. Un punto débil de este esquema es la falta de datos estadísticos, sobre todo en países del llamado Tercer Mundo, que por sus características económicas no destinan fondos para este tipo de estudio. Es por ello interesante ejecutar metodologías de relevamiento de bajo costo, accesibles aún a pe...

ECOLODGE EN LA PLAYA Y MANGLARES DE SAN PEDRO – SECHURA - PIURA

OpenAIRE

Aquino Celis, Ana María; Universidad Nacional de Piura

2016-01-01

El Perú, dueño de un pasado grandioso y de una geografía variada e imponente, posee también un gran potencial en el borde costero Piurano.Dado el interés en preservar el hábitat de las diferentes especies que alberga la zona, se propone: poder interactuar directamente con el Santuario Ecológico Regional, previo establecimiento de políticas de conservación y de la educación ambiental a la población en temas puntuales, tales como: ecología, humedales, sostenibilidad y desarrollo de la comunidad...

Attack for aquatic animals (shark and alligator): Report of two fatal cases in the Bocas del Toro province (Panama)

OpenAIRE

Mendieta, C.; Duarte, A.

2009-01-01

Los ataques por animales acuáticos, y especialmente los producidos por tiburón y cocodrilo, son muy poco frecuentes. Se han descrito ataques por tiburón en países como Australia, Sudáfrica, Brasil, Bahamas, México y Puerto Rico, algunos con resultado fatal en los últimos cinco años. En Panamá, los casos descritos de ataques por escualo son escasos, siendo el último descrito con resultado no fatal en julio de 2008 en una playa de la localidad de San Carlos mientras que el último caso fatal se ...

La sedimentación salina actual en las lagunas de La Mancha: una síntesis.

OpenAIRE

Peña Zarzuelo, Antonio de la; Marfil, R.

1986-01-01

[ES] La Mancha es una región natural de más de 30.000 Km2, caracterizada por una topografía extraordinariamente plana y un clima de tipo semiárido (Cuadro 1, Fig. 2), en la que existen numerosas lagunas salinas (Fig. 1), la mayoría de las cuales, por su régimen anual, pueden ser consideradas como «playa-lakes» (Fig. 3). Desde el punto de vista hidroquimico sus salmueras están integradas por: a) aniones: SO4 y Cl, con CO3 y CO 3H subordinados, y b) cationes: Mg 2+ y ...

Levantamientos y seguimientos topo-batimétricos en ingeniería de costas

OpenAIRE

Esteban Chapapría, Vicent; Aguilar, José; Serra Peris, José; Medina, Josep R.

1995-01-01

Se describen los métodos de ejecución de trabajos topográficos y batimétricos de seguimiento de playas, esenciales para la comprensión y control de los procesos litorales. Se plantea el problema de la medición de profundidades y de otras variables descriptivas de la fenomenología oceánica y las fuentes de error dependiendo de las técnicas y métodos empleados. Se comparan los errores de medida típicos de los sistemas de medición de profundidades habituales señalando los niveles de error ...

Las ciudades históricas españolas como destinos turísticos. Patrimonio cultural y sistema de acogida local

OpenAIRE

Grupo de Investigación

2006-01-01

Durante los últimos años se asiste a un totiempo eclipsadas por los destinos de sol y playa. Estas ciudades focalizan buena parte de los flujos de turismo cultural de nuestro país, en especial de un turismo ligado a la contemplación y disfrute del patrimonio histórico. Sin embargo, ciudades históricas y turismo cultural no son realidades equivalentes: por una parte, estas ciudades tienden a potenciarse como destinos incipientes de turismo de reuniones, sobre la base de una dotación creciente ...

Online Resource for Earth-Observing Satellite Sensor Calibration

Science.gov (United States)

McCorkel, J.; Czapla-Myers, J.; Thome, K.; Wenny, B.

2015-01-01

The Radiometric Calibration Test Site (RadCaTS) at Railroad Valley Playa, Nevada is being developed by the University of Arizona to enable improved accuracy and consistency for airborne and satellite sensor calibration. Primary instrumentation at the site consists of ground-viewing radiometers, a sun photometer, and a meteorological station. Measurements made by these instruments are used to calculate surface reflectance, atmospheric properties and a prediction for top-of-atmosphere reflectance and radiance. This work will leverage research for RadCaTS, and describe the requirements for an online database, associated data formats and quality control, and processing levels.

El sustento ambiental de la actividad turística de los centros del litoral

OpenAIRE

Ferraro, Rosana; Echechuri, Héctor

1999-01-01

La base económico-productiva de los centros urbanos del litoral marítimo bonaerense es la actividad turística, en su modalidad de sol y playa. La base de sustentación de dicha actividad socioeconómica es la presencia de un sistema natural de gran riqueza paisajística. El presente trabajo identifica unidades homogéneas de paisaje, basadas en la selección de tres indicadores claves del mismo, la geomorfología, la vegetación y el uso del suelo para posteriormente ponderar dichas unidades en su c...

Environmental Impact Statement. Proposed Closure of Los Angeles AFB, California and Relocation of Space Systems Division. Appendix F. Public Comments

Science.gov (United States)

1990-11-01

California) 40 33 Robert J. Wickmire (Hermosa Beach, California) 269 34 J. Lane Zercher ( Playa Del Rey, California) 68 I Ballistic Missile Organization San...71W3M IYT IA AY ACLL. RZA&Y 1CR IT. =MWSIN 3M.O1 SOF RT To IMPAIC us0 am"I REALLY WMRS. I LIMA am IRE REAR 2 VMS. or MAYOR. in 3 MRI isW. HO T DIOG...ITO USR 1, RUFSA . RE.EECT TEACULURTR RECURSDO 17 ARC FUTURE MaAGRS OFUERO WAEIL R DE t5 S INIR1 JANUARY o COFPLWI. N CR UAEAIDOCS SAUTE, AR SISCUNSRE

Factores de riesgo asociados a la hipertensión arterial en mujeres climatéricas

OpenAIRE

Miguel Lugones Botell; Tatiana Dávalos Sarría; Julia Pérez Piñeiro

2002-01-01

Se realizó un estudio descriptivo y transversal en 8 consultorios médicos del Policlínico Docente "26 de Julio", del municipio Playa, con las mujeres hipertensas comprendidas entre las edades de 40 a 59 años, las que fueron estudiadas en el período comprendido entre el 1ero. de febrero de 1999 y el 31 de diciembre de 1999. En cada consultorio se partió del registro de dispensarización y se incluyó a todas las mujeres hipertensas esenciales. Como criterio de exclusión se estableció no incluir ...

El ingreso en el hogar y su costo directo en Cuba The direct costs of home care in Cuba

OpenAIRE

Isabel M. Barroso Utra; Anai García Fariñas; Armando Rodríguez Salvá; Pol de Vos; Mariano Bonet Gorbea; Patrick Van Der Stuyft

2007-01-01

OBJETIVOS: Analizar el tiempo de estadía en ingreso en el hogar (IH) y su costo diario y por paciente en Cuba, según el diagnóstico al ingreso y la zona donde se brinda el servicio. MÉTODOS: Se analizó la información de los 837 pacientes en IH entre julio de 2001 y junio de 2002 en un área del municipio Playa, en Ciudad de La Habana (zona urbana metropolitana), una del municipio Cruces, en Cienfuegos (zona urbana no metropolitana), otra del Municipio Unión de Reyes, en Matanzas (zona rural) y...

Segmentación y medición de zonas costeras en secuencias de videos

OpenAIRE

Revollo Sarmiento, Natalia; Cipolletti, Marina P.; Delrieux, Claudio; Perillo, Gerardo M. E.; Piccolo, M. Cintia

2010-01-01

El procesamiento de imágenes y videos es una de las técnicas mas usadas para extraer información cualitativa y cuantitativa que sirve de apoyo a las toma de decisiones. En este trabajo se propone la segmentación y medición de las áreas que conforman la playa empleando procesamiento de video. Los videos fueron captados con videocámaras de bajo costo y procesados en equipos convencionales empleando un lenguaje estándar de programación y bibliotecas de visión por computadora. Se aplicaron algori...

Evaluación de la varazón y contaminación en la Bahía Paracas – Pisco

OpenAIRE

Jacinto, María Elena; Martínez, Carlos; Sánchez, Sonia; Flores, Georgina; Pizarro, Luis

1996-01-01

Presenta los resultados de las prospecciones realizadas el 29 de abril y el 4-7 de mayo de 1995 como consecuencia de la varazón de lizas acaecido el 25 de abril en las playas de Santo Domingo, Pisco-Perú. Durante el operativo se realizó una evaluación, física, química y biológica del ecosistema marino costero el cual incluyó la cuantificación de hidrocarburos de petróleo. Los resultados demostraron condiciones críticas en el ambiente acuático (anoxia, sulfuros elevados, grandes cantidades de ...

Review of soil moisture flux studies at the Nevada Test Site, Nye County, Nevada

International Nuclear Information System (INIS)

Tyler, S.W.

1987-04-01

This report documents almost 30 years of research on soil moisture movement and recharge at the Department of Energy, Nevada Test Site. Although data is scarce, three distinct topographic zones are represented: alluvial valleys, inundated terrains, and upland terrain. Recharge in alluvial valleys was found to be very small or negligible. Ponded areas such as playas and subsidence craters showed significant amounts of recharge. Data in the upland terrains is very scarce but one area, Rainier Mesa, shows active recharge of up to three percent of the annual average precipitation in fractured volcanic tuff. The report summarizes the results

Lake Austin uranium deposit, Western Australia

International Nuclear Information System (INIS)

Heath, A.G.; Deutscher, R.L.; Butt, C.R.M.

1984-01-01

The Lake Austin uranium deposit is a calcrete type deposit in the Yilgarn Block, near Cue, in a catchment area of granitoids and greenstones. The uranium is in valley fill and the sediments of the Lake Austin playa. The mineralization occurs over 1 to 6 meter thickness close to the water table in calcrete overlying clays and/or weathered bedrock. The principal uranium mineral is carnotite. Waters in nearby channels have an uranium content of over 30 ppb. The chloride content of the water increases downstream in the nearby drainages, as does the uranium and vanadium content. (author)

SPINAL CORD INJURY DUE TO DIVING ACCIDENTS AND STRESS AMONG ARTISANAL FISHERS

OpenAIRE

Eliane Santos Cavalcante; João Mário Pessoa Júnior; Izaura Luzia Silvério Freire; Ana Cristina Mancussi e Faro; Gilson de Vasconcelos Torres; Francisco Arnoldo Nunes de Miranda

2017-01-01

Objetivo: analizar la presencia y los síntomas de estrés en pescadores artesanales víctimas de lesión medular. Método: estudio descriptivo, seccional y cuantitativo, realizado con una muestra no probabilístico de 44 pescadores víctimas de lesión medular en las playas del litoral norte de Rio Grande do Norte. Los datos fueron recolectados por medio de la aplicación de inventario sobre presencia y síntomas de estrés para adultos, contemplando aún características sociodemográficas y clínica...

Prevalencia de sífilis congénita en tres hospitales públicos de Baja California, México, 2012-2015

Directory of Open Access Journals (Sweden)

Jorge Luis Arellano-Estrada

2017-08-01

Full Text Available Señor editor: Presentamos los resultados de un estudio descriptivo con base en datos de estudio epidemiológico (EE de caso para sífilis congénita (SC. El formato contiene antecedentes, síntomas, evolución y asociación con factores de riesgo (FR del binomio madre-hijo. El análisis se basa en identificar la prevalencia de SC en los Hospitales de la Secretaría de Salud (SSa de los municipios de Tijuana, Playas de Rosarito y Tecate, Baja California, de 2012 a 2015.

Palinofloras de las formaciones El Morterito y Palo Pintado [Mioceno Superior-Plioceno Inferior], noroeste de Argentina

OpenAIRE

Horn, Maricel Yanina

2014-01-01

En esta Tesis Doctoral se presenta el estudio palinológico de dos unidades litológicas del Mioceno Tardío/Plioceno de Argentina: la Formación El Morterito (Aloformación Playa del Zorro) aflorante en el valle del Cajón, provincia de Catamarca y Formación Palo Pintado en el Valle Calchaquí, provincia de Salta. La sucesión Neógena del valle del Cajón fue primeramente descripta como Formación El Morterito, posteriormente se reconocieron tres Aloformaciones. Considerando las áreas de distribución ...

Cultivo del pargo de la mancha Lutjanus guttatus (pisces: Lutjanidae en jaulas flotantes.

Directory of Open Access Journals (Sweden)

Ricardo Gutiérrez Vargas

2016-03-01

Full Text Available En dos ensayos paralelos realizados frente a Playa Pájaros, en el Golfo de Nicoya, se engordaron pargos manchados (Lutjanus guttatus obtenidos del medio hasta 275 y 485 g, respectivamente, usando fauna de descarte obtenida de barcos camaroneros. La tasa de crecimiento fue de 1,87 y 1,7 g/día, respectivamente, el factor de conversión fue de 7,88 (alimento húmedo o 1,77 (alimento seco. La mortalidad se estimó en un 6% en todo el experimento. Se calcularon los costos de alimentación usando la fauna de descarte.

La revitalización del Centro Histórico de Santo Domingo: estudio y análisis de las leyes y políticas públicas del patrimonio histórico y cultural

OpenAIRE

Grace Mateo Rosario; Maria Letícia Mazzucchi Ferreira

2016-01-01

La República Dominicana actualmente representa un gran atractivo turístico en el Caribe. El país es conocido por poseer bellas playas y reservas naturales, clima tropical agradable y numerosos lugares de interés histórico, ecológico y cultural. El área de estudio que tiene la identidad y herencia cultural en su máxima expresión, se encuentra localizada en el Centro Histórico de Santo Domingo, una ciudad que tiene una combinación de viviendas y edificaciones históricas de los primeros asentami...

Applying Independent Component Analysis on Sentinel-2 Imagery to Characterize Geomorphological Responses to an Extreme Flood Event near the Non-Vegetated Río Colorado Terminus, Salar de Uyuni, Bolivia

Directory of Open Access Journals (Sweden)

Jiaguang Li

2018-05-01

Full Text Available In some internally-draining dryland basins, ephemeral river systems terminate at the margins of playas. Extreme floods can exert significant geomorphological impacts on the lower reaches of these river systems and the playas, including causing changes to flood extent, channel-floodplain morphology, and sediment dispersal. However, the characterization of these impacts using remote sensing approaches has been challenging owing to variable vegetation and cloud cover, as well as the commonly limited spatial and temporal resolution of data. Here, we use Sentinel-2 Multispectral Instrument (MSI data to investigate the flood extent, flood patterns and channel-floodplain morphodynamics resulting from an extreme flood near the non-vegetated terminus of the Río Colorado, located at the margins of the world’s largest playa (Salar de Uyuni, Bolivia. Daily maximum precipitation frequency analysis based on a 42-year record of daily precipitation data (1976 through 2017 indicates that an approximately 40-year precipitation event (40.7 mm occurred on 6 January 2017, and this was associated with an extreme flood. Sentinel-2 data acquired after this extreme flood were used to separate water bodies and land, first by using modified normalized difference water index (MNDWI, and then by subsequently applying independent component analysis (ICA on the land section of the combined pre- and post-flood images to extract flooding areas. The area around the Río Colorado terminus system was classified into three categories: water bodies, wet land, and dry land. The results are in agreement with visual assessment, with an overall accuracy of 96% and Kappa of 0.9 for water-land classification and an overall accuracy of 83% and Kappa of 0.65 for dry land-wet land classification. The flood extent mapping revealed preferential overbank flow paths on the floodplain, which were closely related to geomorphological changes. Changes included the formation and enlargement of

Promoting the healthy, safe use of recreational waters Por un uso saludable y seguro de las aguas de recreo

Directory of Open Access Journals (Sweden)

2003-11-01

Full Text Available Las actividades acuáticas recreativas pueden ofrecer beneficios considerables para la salud y el bienestar de las personas. Por ejemplo, los lagos y los ríos pueden brindar un ambiente adecuado para el descanso, la actividad física y el esparcimiento. Además, muchos países de todas las latitudes dependen de sus extensas playas cubiertas de arena para atraer a los turistas, y los desembolsos de esos visitantes contribuyen a la economía local. Sin embargo, esas actividades acuáticas también pueden representar riesgos para la salud, ya que aguas contaminadas o poco seguras en lugares de recreo pueden conducir a infecciones y enfermedades, lesiones e incluso la muerte. Para ayudar a lidiar con este tipo de problemas, la Organización Mundial de la Salud (OMS emitió recientemente un informe titulado Directrices para un Medio Acuático Recreativo Seguro (Guidelines for Safe Recreational Water Environments. El texto está dirigido a reducir las muertes y lesiones de los bañistas, así como a hacer las playas y los espacios recreativos acuáticos más seguros para el descanso, los ejercicios y el esparcimiento. El nuevo informe de la OMS trata sobre riesgos tales como el de ahogarse y recibir lesiones; la exposición al frío, el calor y las radiaciones solares; la calidad del agua; la contaminación de la arena de las playas; y la exposición a algas, agentes químicos y físicos, así como a organismos acuáticos peligrosos. Las directrices propuestas en el informe de la OMS deben servir de base para desarrollar estrategias nacionales e internacionales -como estándares y regulaciones-, para controlar los riesgos para la salud que se pueden encontrar en los medios acuáticos de recreo y, al mismo tiempo, deben ofrecer un marco de trabajo para las autoridades locales encargadas de tomar decisiones. Estas directrices también se pueden utilizar como material de referencia para las industrias y los operadores que preparan proyectos de

Uranium in South America with Emphasis on the Brazilian Uranium Province (Summary L'uranium en Amérique du Sud et plus particulièrement dans la province uranifère brésilienne (résumé

Directory of Open Access Journals (Sweden)

Forman J. M. A.

2006-11-01

Full Text Available The search for uranium hos been going on in South America for the last 30 years and has led to discoveries of deposits in the following countries: Brazil, Argentine, Venezuela, Peru, Chile, Colombia and Ecuador. - In addition to the already known deposits in Brazil at Pocas de Caldas (Minas Gerais, Figueira (Parana and Quadrilatère Ferrifère (Minas Gerais, other deposits have been discovered at Itatiaia where the uranium is associated with phosphates, in the Lagoa Real region where the uranium is in microclinal gneiss, and in the Rio Preto region. Nearly 100 ore shows have been found in Lower Precarnbrian shales covered by Middle Precambrion quartzose sandstore. The industrial complexes of Pocas de Caldas and Fiqueira will start production respectively in 1980 and 1983. - In Argentina the mains deposits are in the Serra Pintada (Mendoza Province, at Los Adobes and Cerro Condor (Chubut Province and at Don Otto in the northern part of the country. Reserves now known and those being developed are very promising for the future. Pendant les 30 dernières années la recherche de l'uranium s'est poursuivie en Amérique du Sud et a abouti à la découverte de gisements dans les pays suivants : Brésil, Argentine, Venezuela, Pérou, Chili, Colombie et Équateur. . - Au Brésil, outre les gisements déjà connus de Poças de Caldas (Minas Gerais de Figueira (Parana et du Quadrilatère Ferrifère des Minas Gerais, d'autres gisements ont été découverts à Itatiaia où l'uranium est associé à des phosphates, dans la zone de Lagoa Real où l'uranium se trouve dans des gneiss à microcline et dans la région de Rio Preto. Près de 100 indices minéralisés sont reconnus dans les schistes du Précambrien inférieur recouverts par des grès quartzeux d'âge précambrien moyen. Les complexes industriels de Pocas de Caldas et de Figueira entreront en production respectivement en 1980 et 1983. - En Argentine, les principaux gisements se trouvent dans la

SEDIMENTOLOGICAL PARAMETERS AND DATING OF POSTBARREIRAS SEDIMENTS FROM REGION THE COASTLINE

Directory of Open Access Journals (Sweden)

Cristiano Marcelo Pereira de Souza

2016-01-01

Full Text Available Aunque hay algunas obras de los años 80, poco se sabe sobre el origen y los mecanismos de los depósitos de sedimentos la formación Barreiras. El objetivo del presente trabajo fue analizar los parámetros sedimentológico, morfología de los granos y la datación de sedimentos. Se recogieron muestras de sedimentos Pós-Barreiras y sedimentos de la playa, en el que se sometieron a la dispersión de arcilla y limo, utilizando NaOH 0,1 mol L-1 ; la fracción de arena se separó a intervalos de 1/2 phi [ ] y la morfología del grano se analizó por medio de microscopio óptico. Utilizó la datación de muestras por el método de luminiscencia óptica- mente estimulada. Los resultados indican que los sedimentos Pós-Barreiras fueron depositados en ambiente de alta energía, presumiblemente por el aumento de la contribución de los procesos marinos con posible reelaboración viento. Los sedimentos de la playa delanteros mostraron características eólicas. Las edades determinaron que la deposición de los sedimentos Pós-Barreiras fue a finales del Pleistoceno al Holoceno (de 6.9 a el 85,4 ka. La posición latitudinal de los sedimentos Pós-Barreiras (40 a 150 m no se puede asociar con cualquier aumento del nivel del mar conocido, posiblemente, la que aparece que procesos neotectónicos han promovido la elevación.

Regional and climatic controls on seasonal dust deposition in the southwestern U.S.

Science.gov (United States)

Reheis, M.C.; Urban, F.E.

2011-01-01

Vertical dust deposition rates (dust flux) are a complex response to the interaction of seasonal precipitation, wind, changes in plant cover and land use, dust source type, and local vs. distant dust emission in the southwestern U.S. Seasonal dust flux in the Mojave-southern Great Basin (MSGB) deserts, measured from 1999 to 2008, is similar in summer-fall and winter-spring, and antecedent precipitation tends to suppress dust flux in winter-spring. In contrast, dust flux in the eastern Colorado Plateau (ECP) region is much larger in summer-fall than in winter-spring, and twice as large as in the MSGB. ECP dust is related to wind speed, and in the winter-spring to antecedent moisture. Higher summer dust flux in the ECP is likely due to gustier winds and runoff during monsoonal storms when temperature is also higher. Source types in the MSGB and land use in the ECP have important effects on seasonal dust flux. In the MSGB, wet playas produce salt-rich dust during wetter seasons, whereas antecedent and current moisture suppress dust emission from alluvial and dry-playa sources during winter-spring. In the ECP under drought conditions, dust flux at a grazed-and-plowed site increased greatly, and also increased at three annualized, previously grazed sites. Dust fluxes remained relatively consistent at ungrazed and currently grazed sites that have maintained perennial vegetation cover. Under predicted scenarios of future climate change, these results suggest that an increase in summer storms may increase dust flux in both areas, but resultant effects will depend on source type, land use, and vegetation cover. ?? 2011.

Persistent leatherback turtle migrations present opportunities for conservation.

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George L Shillinger

2008-07-01

Full Text Available Effective transboundary conservation of highly migratory marine animals requires international management cooperation as well as clear scientific information about habitat use by these species. Populations of leatherback turtles (Dermochelys coriacea in the eastern Pacific have declined by >90% during the past two decades, primarily due to unsustainable egg harvest and fisheries bycatch mortality. While research and conservation efforts on nesting beaches are ongoing, relatively little is known about this population of leatherbacks' oceanic habitat use and migration pathways. We present the largest multi-year (2004-2005, 2005-2006, and 2007 satellite tracking dataset (12,095 cumulative satellite tracking days collected for leatherback turtles. Forty-six females were electronically tagged during three field seasons at Playa Grande, Costa Rica, the largest extant nesting colony in the eastern Pacific. After completing nesting, the turtles headed southward, traversing the dynamic equatorial currents with rapid, directed movements. In contrast to the highly varied dispersal patterns seen in many other sea turtle populations, leatherbacks from Playa Grande traveled within a persistent migration corridor from Costa Rica, past the equator, and into the South Pacific Gyre, a vast, low-energy, low-productivity region. We describe the predictable effects of ocean currents on a leatherback migration corridor and characterize long-distance movements by the turtles in the eastern South Pacific. These data from high seas habitats will also elucidate potential areas for mitigating fisheries bycatch interactions. These findings directly inform existing multinational conservation frameworks and provide immediate regions in the migration corridor where conservation can be implemented. We identify high seas locations for focusing future conservation efforts within the leatherback dispersal zone in the South Pacific Gyre.

Atención Ginecológica en pediatría: Algunos resultados de nuestro trabajo

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Miguel Lugones Botell

2002-06-01

Full Text Available Se realizó un estudio descriptivo y transversal de 150 pacientes de 0 a 10 años de edad, atendidas con historias clínicas en la consulta de Ginecología Infanto Juvenil en el municipio Playa, entre el 1ro. de septiembre de 1996 y el 30 de noviembre del 2001, donde se analizaron las siguientes variables: principales motivos de consulta en relación con la edad, principales causas de leucorrea o vulvovaginitis, causas de trastornos de la pubertad y causas de dolor pelviano. Se concluye que los principales motivos de consulta fueron la leucorrea o vulvovaginitis, los trastornos de la pubertad y el dolor pelviano, y las principales causas de éstas fueron la vaginosis bacteriana como principal causa de leucorrea; la telarquia precoz, en el trastorno de la pubertad y la giardiasis, en el dolor pelviano en la mayoría de las niñas.A descriptive cross-sectional study was conducted on 150 patients aged 0-10 years, seen with their medical histories at the Pediatric-Juvenile Gynecology Outpatient Service in Playa municipality from September 1st,1996 to November 30th,2001. The study analyzed the following variables: principal reasons for going to see the gynecologist according to age, main causes of leukorrhea or vulvovaginitis, causes of puberty disorders and of pelvic pain. It was concluded that the main reasons for going to the gynecologist were leukorrhea or vulvovaginitis, puberty disorders and pelvic pain, whereas the main cause of leukorrhea was bacterial vaginosis, puberty disorders resulted from premature thelarche, and pelvic pain was caused by giardiasis in most of the girls.

Selection of geohydrologic boundaries for ground-water flow models, Yucca Mountain, Nevada

International Nuclear Information System (INIS)

Downey, J.S.; Gutentag, E.D.; Kolm, K.E.

1990-01-01

The conceptual ground-water model of the southern Nevada/Death Valley, California region presented in this paper includes two aquifer systems: a shallow, intermontane, mostly unconfined aquifer composed of unconsolidated or poorly consolidated sediments and consolidated, layered volcanics, and a deep, regional multiple-layered, confined aquifer system composed of faulted and fractured carbonate and volcanic rocks. The potentiometric surfaces of both aquifer systems indicate that ground water leaks vertically from the deeper to the shallower geologic units, and that water in the shallower aquifer may not flow beyond the intermontane subbasin, whereas water in the deeper aquifer may indicate transbasinal flow to the playas in Death Valley. Most of the hydrologic boundaries of the regional aquifer systems in the Yucca Mountain region are geologically complex. Most of the existing numerical models simulating the ground-water flow system in the Yucca Mountain region are based on limited potentiometric-head data elevation and precipitation estimates, and simplified geology. These models are two-dimensional, and are not adequate. The alternative approach to estimating unknown boundary conditions for the regional ground-water flow system involves the following steps: (1) Incorporate known boundary-conditions data from the playas in Death Valley and the Ash Meadows spring line; (2) use estimated boundary data based on geological, pedological, geomorphological, botanical, and hydrological observations; (3) test these initial boundary conditions with three-dimensional models, both steady-state and transient; (4) back-calculate the boundary conditions for the northern, northwestern, northeastern and eastern flux boundaries; (5) compare these calculated values with known data during model calibration steps; and (6) adjust the model. 9 refs., 6 figs

Persistent Leatherback Turtle Migrations Present Opportunities for Conservation

Science.gov (United States)

Shillinger, George L; Palacios, Daniel M; Bailey, Helen; Bograd, Steven J; Swithenbank, Alan M; Gaspar, Philippe; Wallace, Bryan P; Spotila, James R; Paladino, Frank V; Piedra, Rotney; Eckert, Scott A; Block, Barbara A

2008-01-01

Effective transboundary conservation of highly migratory marine animals requires international management cooperation as well as clear scientific information about habitat use by these species. Populations of leatherback turtles (Dermochelys coriacea) in the eastern Pacific have declined by >90% during the past two decades, primarily due to unsustainable egg harvest and fisheries bycatch mortality. While research and conservation efforts on nesting beaches are ongoing, relatively little is known about this population of leatherbacks' oceanic habitat use and migration pathways. We present the largest multi-year (2004–2005, 2005–2006, and 2007) satellite tracking dataset (12,095 cumulative satellite tracking days) collected for leatherback turtles. Forty-six females were electronically tagged during three field seasons at Playa Grande, Costa Rica, the largest extant nesting colony in the eastern Pacific. After completing nesting, the turtles headed southward, traversing the dynamic equatorial currents with rapid, directed movements. In contrast to the highly varied dispersal patterns seen in many other sea turtle populations, leatherbacks from Playa Grande traveled within a persistent migration corridor from Costa Rica, past the equator, and into the South Pacific Gyre, a vast, low-energy, low-productivity region. We describe the predictable effects of ocean currents on a leatherback migration corridor and characterize long-distance movements by the turtles in the eastern South Pacific. These data from high seas habitats will also elucidate potential areas for mitigating fisheries bycatch interactions. These findings directly inform existing multinational conservation frameworks and provide immediate regions in the migration corridor where conservation can be implemented. We identify high seas locations for focusing future conservation efforts within the leatherback dispersal zone in the South Pacific Gyre. PMID:18630987

Métodos de investigación diversos en el estudio de la salud familiar

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María T Ortiz Gómez

1999-04-01

Full Text Available Se realiza un estudio descriptivo a través del uso de métodos cualitativos y cuantitativos de investigación con el objetivo de caracterizar los problemas de salud familiar en la comunidad de Jaimanitas, ubicada en el municipio Playa, de Ciudad de La Habana. Para el análisis cuantitativo se seleccionaron 96 familias a las que se aplicó el instrumento cubano FFSIL y un cuestionario elaborado al efecto. El estudio cualitativo se realiza mediante el modelo del Juicio Grupal Ponderado, que permite indentificar, priorizar y explicar los problemas a través de la participación de cuatro grupos de actores sociales vinculados a la Salud Familiar. Con el empleo de estas técnicas se aprecia la similitud de sus resultados, en tanto se constatan dificultades en el funcionamiento familiar a expensas del divorcio, alcoholismo, problemas de la vivienda y migracionesA descriptive study is conducted by using qualitative and quantitative research methods aimed at characterizing the family health problems in the community of Jaimanitas, located in Playa municipality, in Havana City. 96 families were selected for the quantitative analysis. The FFSIL Cuban instrument and a questionnarie designed to this end were used. The qualitative study is carried out by using the model of Adjusted Group Judgement that allows to identify, give priority and explain the problems through the participation of 4 groups of oficial actors connected with Family Health. On using these technique it is observed that their results are similar. Divorce, drinking, housing problems and migration are among the commones difficulties affecting the family