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Sample records for del fuego ecosystem

  1. Linking invasive exotic vertebrates and their ecosystem impacts in Tierra del Fuego to test theory and determine action

    Science.gov (United States)

    Valenzuela, Alejandro E. J.; Anderson, Christopher B.; Fasola, Laura; Cabello, José L.

    2014-01-01

    Understanding processes and impacts of biological invasions is fundamental for ecology and management. Recent reviews summarized the mechanisms by which invasive species alter entire ecosystems, but quantitative assessments of these mechanisms are lacking for actual assemblages to determine their relative importance, frequency and patterns. We updated information on introduced vertebrates in the Tierra del Fuego Archipelago (TDF) via an exhaustive literature review and new data to evaluate ecosystem impact mechanisms and provide management recommendations. To date, 24 exotic vertebrates have naturalized in TDF, outnumbering natives nearly 2:1, with the North American beaver (Castor canadensis) and muskrat (Ondatra zibethica) being the most widely distributed species and also impacting the ecosystem through the greatest number of mechanisms. Introduced vertebrates occupied most parts of the archipelago with human-inhabited islands having greater taxa richness. All exotics potentially altered ecosystems by one or more mechanisms: 100% food webs, 92% invasional meltdown, 42% habitat modification, 38% disease or parasite transmission, 21% soil property and disturbance regime changes. Impact to habitat structure was the main clustering criterion for this assemblage. Within the species that physically alter habitats, we found two sub-groups: 1) large herbivores and 2) "others" including beavers and muskrats. Species that did not alter habitat were divided further into those with predatory trophic effects (carnivorous mammals and trout, sub-group 4) and the rest with assorted impacts (sub-group 3). By establishing high quality information on archipelago-wide assemblage, distribution, impacts and mechanisms for exotic vertebrates, we recommend, based on ecological criteria, prioritizing the management of sub-group 2. A secondary priority might be given to the carnivores in sub-group 4, while species in sub-groups 1 and 3 are less urgent. As the first systematic survey of

  2. Exploraciones Micológicas en Tierra del Fuego Mycological explorations in Tierra del Fuego

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    Irma J. Gamundí

    2007-07-01

    Full Text Available Se narran las expediciones marítimas y terrestres en Tierra del Fuego durante los siglos XIX y XX, desde el punto de vista de la exploración micológica cuyos resultados han sido vertidos en publicaciones, destacando las expediciones argentinas. Contiene mapas con las principales expediciones argentinas. Se hace una evaluación de la diversidad fúngica de acuerdo con los datos previamente analizados, comparando los registros de colección en ambos períodos que indican una duplicación del número total de taxones de 647 especies descriptas en el siglo XIX hasta 1269 en el siglo XX. Simultáneamente se observa una disminución del 50,4 % al 19.7 % en el número de especies nuevas publicadas. Se agrega una lista de coleccionistas y otra del estado de conservación ex situ de especies seleccionadas. Se hace un breve comentario sobre la conservación de hábitats colonizados por hongos que están perturbados por la explotación no sustentable de los recursos naturales.A narration of the leading maritime and terrestrial expeditions in Fuegia during the XIX and XX centuries is approached from the point of view of the mycological exploration and published results on the mycobiota, emphazising the Argentine expeditions. Maps with the itinerary of main Argentine expeditions is given. An evaluation of the fungal diversity according to the previous review is presented, comparing the fungal records during both periods that shows duplication of the total number of taxa from 647 species described in XIX century to 1269 in the XX century. Simultaneously there is a decrease from 50.4 % to 19.7 % in the number of new species published. A list of collectors and a table with the state of ex-situ conservation of selected species is presented. A brief comment is given on conservation of habitats supporting fungal population that are disturbed by unsustainable exploitation of natural resources.

  3. La técnica tradicional del estuco "a fuego"

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    Gonzalez Yunta, Francisco; González Cortina, Mariano; Lasheras Merino, Félix

    2010-01-01

    Dentro de las diferentes técnicas de acabados de paramentos que tradicionalmente se han ejecutado con mortero de cal destaca, por su dificultad, la realización del estuco a fuego. En su elaboración se empleaban morteros y pastas de cal con aditivos como pigmentos y jabones vegetales; con la aplicación final de una plancha metálica a una elevada temperatura se creaba una terminación continua que imitaba las piedras naturales. A pesar de que dichos acabados se han utilizado profusamente e...

  4. "Los avisadores del fuego": Rosenzweig, Benjamin, Kafka

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    Mate, Reyes

    2000-12-01

    Full Text Available There were thinkers who foretold in their time the signs of the coming catastrophe. They were not prophets but fine analysts. We are referring to Rosenzweig, Benjamin and Kafka. In the "idealism" of the philosophy that comes from Jonia and reaches Jena, Rosenzweig animadverted on the tendency to a totalitarianism that potentially converted it into an "ontology of war". Benjamin brought to light the radical ambiguity within the concept of progress, so fundamental to the illustrated thought. Barbarism, in general, and fascism, in particular, are not the opposite to progress but one of its possibilities. That fatal possibility is, for the victim, the rule. Kafka traced with foresight the fascist reduction of man to bare life in the recurrent animalisation of his characters, as well as the denial of the other in those presented as victims of incommunications.

    Hubo pensadores que supieron leer en su tiempo signos de la catástrofe venidera. No eran profetas sino finos analistas. Nos referimos a Rosenzweig, Benjamin y Kafka. Rosenzweig denunció en el "idealismo" de la filosofía que viene desde Jonia y llega hasta Jena la tendencia a un totalitarismo que la convertía en potencialmente en una "ontología de la guerra". Benjamin dejó constancia de la ambigüedad radical del concepto de progreso, tan fundamental para el pensamiento ilustrado. La barbarie, en general, y el fascismo, en particular, no son lo opuesto al progreso sino una de sus posibilidades. Esa fatal posibilidad es, para la víctima, la norma. Kafka capta anticipadamente la reducción fascista del hombre a nuda vida en la recurrente animalización de sus personajes, así como la negación del otro en sus personajes víctimas de la incomunicación.

  5. Cultural tourism in fragile institutional contexts: project for cultural routes in Tierra del Fuego

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    Garcés Feliu, Eugenio

    2012-01-01

    The following paper presents a project of Cultural Routes designed for the Chilean Tierra del Fuego, linked to promoting tourism and boosting the economy, through the development of a specific high standard tourism offer, linked to its natural and cultural heritage, with the purpose of capturing the potential income generation for Chile. The project had as main goal to enhance the competitiveness of the tourism sector of special interests in Tierra del Fuego, a key sector of South...

  6. The perceived image of Tierra del Fuego (Argentina in travel stories published by “TravelPod”

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    Patricia Andrea Mosti

    2017-07-01

    environmental conditions, with inhospitable landscapes and, by all appearances, a pristine ecosystem. Together these things form a constitutive part the territorial identity of southern Patagonia. The cartography, the scientific expeditions, the religious missions, the journalism and the literature played an important role in the diffusion and permanency of these representations. In modern Western societies, companies have positioned the concept as a powerful tourist resource, capable of motivating travelers coming to Tierra del Fuego. The present communication proposes an approximation to the perceived image of Tierra del Fuego, according to tourists’ statements in trip blogs, taking these chronicles from sources posted on the site Travelpod. The aim is to examine the contents of the perceived image and to investigate the ways that the concept “End of the World” is resignified. The tourists’ testimonies appeal always to the idea of the End of the World; these representations can be condensed to two dimensions, the one linked to physical – geographical aspects and another that recreates symbolic contents. In the perceived images of Tierra del Fuego, there is an intermingling of the archaic, the legend and the distance, the impregnable vastness of the nature and the recollection of heroic expeditions.

  7. Bryophyte-cyanobacteria associations during primary succession in recently Deglaciated areas of Tierra del Fuego (Chile).

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    Arróniz-Crespo, María; Pérez-Ortega, Sergio; De Los Ríos, Asunción; Green, T G Allan; Ochoa-Hueso, Raúl; Casermeiro, Miguel Ángel; de la Cruz, María Teresa; Pintado, Ana; Palacios, David; Rozzi, Ricardo; Tysklind, Niklas; Sancho, Leopoldo G

    2014-01-01

    Bryophyte establishment represents a positive feedback process that enhances soil development in newly exposed terrain. Further, biological nitrogen (N) fixation by cyanobacteria in association with mosses can be an important supply of N to terrestrial ecosystems, however the role of these associations during post-glacial primary succession is not yet fully understood. Here, we analyzed chronosequences in front of two receding glaciers with contrasting climatic conditions (wetter vs drier) at Cordillera Darwin (Tierra del Fuego) and found that most mosses had the capacity to support an epiphytic flora of cyanobacteria and exhibited high rates of N2 fixation. Pioneer moss-cyanobacteria associations showed the highest N2 fixation rates (4.60 and 4.96 µg N g-1 bryo. d-1) very early after glacier retreat (4 and 7 years) which may help accelerate soil development under wetter conditions. In drier climate, N2 fixation on bryophyte-cyanobacteria associations was also high (0.94 and 1.42 µg N g-1 bryo. d-1) but peaked at intermediate-aged sites (26 and 66 years). N2 fixation capacity on bryophytes was primarily driven by epiphytic cyanobacteria abundance rather than community composition. Most liverworts showed low colonization and N2 fixation rates, and mosses did not exhibit consistent differences across life forms and habitat (saxicolous vs terricolous). We also found a clear relationship between cyanobacteria genera and the stages of ecological succession, but no relationship was found with host species identity. Glacier forelands in Tierra del Fuego show fast rates of soil transformation which imply large quantities of N inputs. Our results highlight the potential contribution of bryophyte-cyanobacteria associations to N accumulation during post-glacial primary succession and further describe the factors that drive N2-fixation rates in post-glacial areas with very low N deposition.

  8. Bryophyte-Cyanobacteria Associations during Primary Succession in Recently Deglaciated Areas of Tierra del Fuego (Chile)

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    Arróniz-Crespo, María; Pérez-Ortega, Sergio; De los Ríos, Asunción; Green, T. G. Allan; Ochoa-Hueso, Raúl; Casermeiro, Miguel Ángel; de la Cruz, María Teresa; Pintado, Ana; Palacios, David; Rozzi, Ricardo; Tysklind, Niklas; Sancho, Leopoldo G.

    2014-01-01

    Bryophyte establishment represents a positive feedback process that enhances soil development in newly exposed terrain. Further, biological nitrogen (N) fixation by cyanobacteria in association with mosses can be an important supply of N to terrestrial ecosystems, however the role of these associations during post-glacial primary succession is not yet fully understood. Here, we analyzed chronosequences in front of two receding glaciers with contrasting climatic conditions (wetter vs drier) at Cordillera Darwin (Tierra del Fuego) and found that most mosses had the capacity to support an epiphytic flora of cyanobacteria and exhibited high rates of N2 fixation. Pioneer moss-cyanobacteria associations showed the highest N2 fixation rates (4.60 and 4.96 µg N g−1 bryo. d−1) very early after glacier retreat (4 and 7 years) which may help accelerate soil development under wetter conditions. In drier climate, N2 fixation on bryophyte-cyanobacteria associations was also high (0.94 and 1.42 µg N g−1 bryo. d−1) but peaked at intermediate-aged sites (26 and 66 years). N2 fixation capacity on bryophytes was primarily driven by epiphytic cyanobacteria abundance rather than community composition. Most liverworts showed low colonization and N2 fixation rates, and mosses did not exhibit consistent differences across life forms and habitat (saxicolous vs terricolous). We also found a clear relationship between cyanobacteria genera and the stages of ecological succession, but no relationship was found with host species identity. Glacier forelands in Tierra del Fuego show fast rates of soil transformation which imply large quantities of N inputs. Our results highlight the potential contribution of bryophyte-cyanobacteria associations to N accumulation during post-glacial primary succession and further describe the factors that drive N2-fixation rates in post-glacial areas with very low N deposition. PMID:24819926

  9. The architecture of the extremes cultural landscapes in Tierra del Fuego

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    Garcés Feliú, Eugenio

    2010-01-01

    This paper aims to analyze the relevance of applying the notion of extreme cultural landscape to Tierra del Fuego, as a complementary category to those defined by Unesco. It states that in Chile there are anumber of territories at the margins –in the end, along the border– that have been built as landscapes, specifics and concretes, where the exploitation of natural resources has proved profitable and the building of human settlements as been allowed. This is the case of Tierra del Fuego, con...

  10. Knowing for controlling: ecological effects of invasive vertebrates in Tierra del Fuego Conocer para controlar: efectos ecológicos de vertebrados invasores en Tierra del Fuego

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    CLAUDIA A SILVA

    2008-03-01

    Full Text Available The Tierra del Fuego (TDF archipelago is recognized as part o the last places on Earth that may still be considered wild. However, this condition may be threatened by the large number of invasive species present on the archipelago. These species can have significant effects on the ecology of the invaded ecosystems, at the genetic as well as at population, community and ecosystem levels. The aim of this study is to, by a bibliographic review, systematize existing information on the ecological impacts these species would be having on the TDF archipelago and detect information gaps in order to orient future research and effective management programs on these species. We restricted our review to vertebrate, non-marine invaders. We determined which species have invaded TDF, described their impacts on the archipelago and evaluated their potential impacts; this last issue was determined by reviewing some of the impacts these species have had in other geographic areas. Our findings indicate that at least nine vertebrate species (Salmo trutta, Salvelinus fontinalis, Oncorhynchus mykiss, Castor canadensis, Ondatra zibethicus, Oryctolagus cuniculus, Pseudalopex griseus, Mustela vison and Sus seroja have wild populations established away from human settlements in TDF. There is some scientific evidence on ecological impacts on the area for only five of these invaders, with the American beaver (Castor canadensis being the species monopolizing the greatest number of studies. These results contrast with the recognition, both in TDF and worldwide, of the potential of most of these species to cause significant ecological impacts, which makes it unlikely that the lack of verified impacts on TDF reflects an absence of significant effects of these invaders on the archipelago. We suggest that future research should focus on determining population density and distribution of these and other (i.e., feral species invasive vertebrates, as well as their impacts mainly on

  11. The architecture of the extremes cultural landscapes in Tierra del Fuego

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    Eugenio Garcés Feliú

    2010-03-01

    Full Text Available This paper aims to analyze the relevance of applying the notion of extreme cultural landscape to Tierra del Fuego, as a complementary category to those defined by Unesco. It states that in Chile there are anumber of territories at the margins –in the end, along the border– that have been built as landscapes, specifics and concretes, where the exploitation of natural resources has proved profitable and the building of human settlements as been allowed. This is the case of Tierra del Fuego, considered as a landscape and as a resource, according to Gregotti and Sola-Morales, that has been formed by a human process on the geographical support of Tierra del Fuego, and owes its existence to a process that transformed this territory into a product, placed south of the ice fields, southeast of the Strait of Magellan, in the confines of America, between south latitudes 52 and 55 degrees. On the other hand, reading the area in terms of palimpsest, according to Corboz, brings out several layers to form the extreme landscapes in Tierra del Fuego, considering some key issues including: the nomination of Magellan as extreme and special area by Cideze; the geographical context of Tierra del Fuego, as the exceptional finish of Patagonia and the gateway to Antarctica; the important collection of narratives and maps bequeathed by European explorers who recognized it; the rich cultural legacy of the aboriginal sélknam; and the human settlements, which emerged at the late nineteenth century, setting some recognizable and typical landscapes. In this way, we argued that the extreme cultural landscapes in Tierra del Fuego have been formed in the manner of overlapping layers, like a palimpsest, in a construction that transcends the physical territory, to settle in the Western cultural fantasy as an imaginary of that remote boundary.

  12. Cultural Tourism In Fragile Institutional Contexts Project For Cultural Routes In Tierra Del Fuego

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    Eugenio Garcés Feliú

    2012-12-01

    Full Text Available The following paper presents a project of Cultural Routes designed for the Chilean Tierra del Fuego, linked to promoting tourism and boosting the economy, through the development of a specific high standard tourism offer, linked to its natural and cultural heritage, with the purpose of capturing the potential income generation for Chile. The project had as main goal to enhance the competitiveness of the tourism sector of special interests in Tierra del Fuego, a key sector of Southern Patagonia, through the dissemination and transfer of technologies and knowledge, acquired in over 10 years of research and projects, onto the territory and local agents. These Cultural Routes build an innovative offer, capable of structuring the diverse touristic resources and strengthening the basis for the development of a new stage of national and international tourism market, located on the southern extreme of Chile and America.

  13. Taenia saginata Goeze, 1872 (Platyhelminthes: Cestoda: Taeniidae en un indígena de Tierra del Fuego, Chile

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    Eduardo I. Faúndez

    2015-06-01

    Full Text Available Se entrega el primer registro del céstodo Taenia saginata en un indígena de Tierra del Fuego (Patagonia chilena, correspondiente al año 1902. Se discute la importancia del registro y se entregan ilustraciones del ejemplar.

  14. Epidemiología de las lesiones por mordedura de perro en Tierra del Fuego, Argentina Epidemiology of dog bite lesions in Tierra del Fuego, Argentina

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    Fabián Zanini

    2008-02-01

    Full Text Available La convivencia del hombre y el perro ha resultado en beneficios mutuos durante miles de años, si bien en el último tiempo han surgido una serie de inconvenientes donde las lesiones por mordeduras ocupan un lugar destacado. El objetivo del presente trabajo fue describir las características epidemiológicas de las lesiones por mordedura de perro ocurridas a lo largo de un año en Tierra del Fuego. Se realizó un estudio observacional descriptivo, transversal, de los pacientes que ingresaron con lesiones por mordedura de perro al Servicio de Guardia Clínica y Pediátrica de los Hospitales y Centros de Salud desde el 1/3/05 hasta el 1/3/06. Se confeccionaron 382 planillas. El 49.5% fueron niños resultando más afectado el grupo de 5-9 años (44.4%; IC95% 37.2-51.8. En adultos correspondió al grupo de 15-24 años (29.5%; IC95% 23.2-36.5. Se registraron más lesiones en varones (57.6% que en mujeres (42.4% (x² = 8.6, p= 0.003. En los meses primavera y verano se registró el 56.5% de las lesiones, en la vía pública el 72.8% de ellas. Los perros de tamaño grande causaron el 49.7% (IC95% 44.6-54.9 de las lesiones. El 89.8% de los ataques fueron causados por perros ajenos. El 55.8% (IC95% 50.6-60.8 se registró en miembros inferiores y el 11% (IC95% 8.1-14.7 en cabeza y cuello. Los datos obtenidos demuestran que en Tierra del Fuego las lesiones por mordedura de perro afectan en forma permanente la salud e impactan en la calidad de vida de la población.The coexistence between man and dog has resulted in mutual benefits during thousands of years, nevertheless some problems have recently arisen where bite injuries have an important role. The aim of this work was to describe the epidemiological characteristics of dog bite lesions which occurred during a year in Tierra del Fuego. A descriptive observational, transversal study of patients who were admitted with dog bite injuries to clinic and pediatric emergency services of hospitals and health

  15. [Tierra del Fuego: the scientific-political construction of exclusion and counter-image of the ideal city dweller].

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    Nacach, Gabriela

    2012-01-01

    Due to its late incorporation into the national State, the social, economic and political setting of the Argentine province Tierra del Fuego differed from that of the rest of the national territory. In the construction of dependent otherness, objectifications and representations were imposed by state-related and non-state-related institutions, among other agencies. In this context, the Salesian mission of La Candelaria and Ushuaia's Jail for recidivists stand out as spaces in which biopolitics was concretised. The native population and criminals in Tierra del Fuego were those to be subjugated. The thesis of the extinction of the Indian and the simultaneous exaltation of the criminal as the subject of progress identified the scientific and political mechanisms by which the exclusion of certain social groups (Tierra del Fuego's indigenous population) and the inclusion of others (criminals) were regulated.

  16. CO2 and CH4 fluxes of contrasting pristine bogs in southern Patagonia (Tierra del Fuego, Argentina)

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    Münchberger, Wiebke; Blodau, Christian; Kleinebecker, Till; Pancotto, Veronica

    2015-04-01

    South Patagonian peatlands cover a wide range of the southern terrestrial area and thus are an important component of the terrestrial global carbon cycle. These extremely southern ecosystems have been accumulating organic material since the last glaciation up to now and are - in contrast to northern hemisphere bogs - virtually unaffected by human activities. So far, little attention has been given to these pristine ecosystems and great carbon reservoirs which will potentially be affected by climate change. We aim to fill the knowledge gap in the quantity of carbon released from these bogs and in what controls their fluxes. We study the temporal and spatial variability of carbon fluxes in two contrasting bog ecosystems in southern Patagonia, Tierra del Fuego. Sphagnum-dominated bog ecosystems in Tierra del Fuego are similar to the ones on the northern hemisphere, while cushion plant-dominated bogs can almost exclusively be found in southern Patagonia. These unique cushion plant-dominated bogs are found close to the coast and their occurrence changes gradually to Sphagnum-dominated bogs with increasing distance from the coast. We conduct closed chamber measurements and record relevant environmental variables for CO2 and CH4 fluxes during two austral vegetation periods from December to April. Chamber measurements are performed on microforms representing the main vegetation units of the studied bogs. Gas concentrations are measured with a fast analyzer (Los Gatos Ultraportable Greenhouse Gas Analyzer) allowing to accurately record CH4 fluxes in the ppm range. We present preliminary results of the carbon flux variability from south Patagonian peat bogs and give insights into their environmental controls. Carbon fluxes of these two bog types appear to be highly different. In contrast to Sphagnum-dominated bogs, cushion plant-dominated bogs release almost no CH4 while their CO2 flux in both, photosynthesis and respiration, can be twice as high as for Sphagnum

  17. Ecohydrological features of some contrasting mires in Tierra del Fuego, Argentina

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    A. Grootjans

    2010-01-01

    Full Text Available In November 2005, Tierra del Fuego (Argentina hosted the biennial conference and field excursion of the International Mire Conservation Group (IMCG. The group considered the vegetation, hydrology, peat stratigraphy and possible management options for about 20 mires which were visited during a seven-day excursion. We report here some field observations and measurements of electrical conductivity (EC25 in five mires which have been selected to encompass the most important ecohydrological features of the mires of Tierra del Fuego. Existing and new data on landscape topography and vegetation were combined in three-dimensional drawings. These drawings are actually conceptual models which could underpin further ecohydrological research, and proved to be very useful as a basis for discussions amongst conference participants about possible ecohydrological relationships. The mires that were studied developed under a wide range of climatic conditions and included fens and bogs. The bogs typically developed from lakes or fens and most are now dominated by Sphagnum magellanicum. This species forms large hummocks, and can invade weakly-buffered fens. Most of the mires were well preserved, but effects of human impact - such as road building and peat extraction - were also noticeable.

  18. State of knowledge of the Corallinales (Rhodophyta of Tierra del Fuego and the Antarctic Peninsula

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    María Laura Mendoza

    1999-12-01

    Full Text Available Corallinales (Rhodophyta in Tierra del Fuego are abundant, with 9 genera, 17 species and 1 subspecies. Pseudolithophyllum with 1 species (P. fueguianum, which represents 35.8% of the coralline algae, is dominant. The genera Parahydrolithon with 4 species (P. consociatum, P. discoideum, P. falklandicum, P. subantarcticum and 20%, Lithothamnion with 3 species (Lt. heterocladum, Lt. rugosum, Lt. granuliferum and 17.5%, and Synarthrophyton with 3 species (S. neglectum, S. patena, S. schmitzii and 12% share are abundant. Clathromorphum with 4 species (Cl. annulatum, Cl. lemoineanum, Cl. obtectulum, Cl. Variabile and a share of 5.8%, and Mesophyllum with 1 species (M. fueguianum and a share of 4.9% are frequent. The remaining three genera, Bossiella with 1 subspecies (B. orbigniana ssp. orbigniana, Corallina with 2 species (C. elongata, C. officinalis (1.1%, and Titanoderna with 1 species (T. conspectum (1% are scarce. C. officinalis is a cosmopolitan, and the other geniculate corallines are found in both hemispheres, whereas the crustose coralline occur only in the southern hemisphere. The characteristic vertical distribution of the species in the intertidal and subtidal zone of Tierra del Fuego is given. The Corallinales in the Antarctic Region are poorly known and need further investigation.

  19. La política del fuego: El desplazamiento contemporáneo del paradigma geopolítico

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    Marder, Michael

    2013-12-01

    Full Text Available This paper theoretizes the transition from a global regime of geopolitics (that is to say, the politics of the earth to a pyropolitical regime, or the politics of fire. Based in the political philosophy of Carl Schmitt, the thesis is that the certainty, stability, and order rooted in the earth are now being displaced by the anomie of fire, as the symbol and the concrete sphere of the political today.Este artículo teoriza la transición del régimen global geopolítico (es decir, la política de la tierra a régimen piropolítico, o la política del fuego. En base a filosofía política de Carl Schmitt, la tesis es que la certidumbre, estabilidad y orden arraigados en la tierra están desplazados por la anomia del fuego, como un símbolo y dominio concreto de lo político hoy.

  20. Guanaco’s diet and forage preferences in Nothofagus forest environments of Tierra del Fuego, Argentina

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    Quinteros, C.P.; Bava, J.; Gobbi, M.E.; Defossé, G.E.

    2017-11-01

    Aim of study: Guanaco (Lama guanicoe Müller), is a South American native ungulate widely distributed in Patagonia, which in the island of Tierra del Fuego (TF), extends its habitat into Nothofagus spp. forests. Within these forests, guanacos consume lenga (Nothofagus pumilio) leaves and twigs, and other understory species. The aim of this work was to determine: 1) the spring and summer diet of free ranging guanacos, and 2) which plants, grown in the forest understory, guanacos do prefer, or avoid, in these seasons of great forage abundance. Area of study: Tierra del Fuego (Argentina), on three representative areas which combined Nothofagus forests and adjacent meadows (vegas). Material and Methods: uanacos’ diet was determined by comparing epidermal and non-epidermal plant fragments with micro-histological analyses of feces. The analysis was made from composite samples of fresh feces, collected at the seasons of maximum forage productivity (spring and summer). Main results: During spring, 48% of guanacos’ diet was composed of lenga leaves, 30% of grass-like species, 15% of grasses, and less than 7% of herbs, shrubs, and lichens. In summer, 40% of the diet was composed of grasses, 30% of lenga leaves, 25% of grass-like species and the rest corresponded to herbs, shrubs, and lichens. Within the forest understory, guanaco selected lenga leaves and twigs, grass species were consumed according to their availability (or sometimes rejected), while other herbs were not consumed at all. Research highlights: Guanacos’ consumption preference for lenga, even considering the high availability of other forages, could adversely affect forest regeneration.

  1. Guanaco’s diet and forage preferences in Nothofagus forest environments of Tierra del Fuego, Argentina

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    Quinteros, C.P.; Bava, J.; Gobbi, M.E.; Defossé, G.E.

    2017-01-01

    Aim of study: Guanaco (Lama guanicoe Müller), is a South American native ungulate widely distributed in Patagonia, which in the island of Tierra del Fuego (TF), extends its habitat into Nothofagus spp. forests. Within these forests, guanacos consume lenga (Nothofagus pumilio) leaves and twigs, and other understory species. The aim of this work was to determine: 1) the spring and summer diet of free ranging guanacos, and 2) which plants, grown in the forest understory, guanacos do prefer, or avoid, in these seasons of great forage abundance. Area of study: Tierra del Fuego (Argentina), on three representative areas which combined Nothofagus forests and adjacent meadows (vegas). Material and Methods: uanacos’ diet was determined by comparing epidermal and non-epidermal plant fragments with micro-histological analyses of feces. The analysis was made from composite samples of fresh feces, collected at the seasons of maximum forage productivity (spring and summer). Main results: During spring, 48% of guanacos’ diet was composed of lenga leaves, 30% of grass-like species, 15% of grasses, and less than 7% of herbs, shrubs, and lichens. In summer, 40% of the diet was composed of grasses, 30% of lenga leaves, 25% of grass-like species and the rest corresponded to herbs, shrubs, and lichens. Within the forest understory, guanaco selected lenga leaves and twigs, grass species were consumed according to their availability (or sometimes rejected), while other herbs were not consumed at all. Research highlights: Guanacos’ consumption preference for lenga, even considering the high availability of other forages, could adversely affect forest regeneration.

  2. A new genus and new species of felt scales (Homoptera: Coccinea: Eriococcidae from Tierra del Fuego (Chile

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    Ilya A. Gavrilov-Zimin

    2016-10-01

    Full Text Available Telmatococcus igniumterrae gen. nov. et sp. nov. is described and illustrated based on the material collected from a sphagnum bog in the extreme southern part of South America (Tierra del Fuego. The new monotypic genus differs from all known genera of Eriococcidae in having short cylindrical truncated setae of the anal apparatus and pouches with numerous quinquelocular pores near the anal apparatus. The habitat of the new taxon is characterized.

  3. MICROFUNGAL COMPOSITION IN AN ASTELIA-DONATIA CUSHION PEATLAND IN TIERRA DEL FUEGO, ARGENTINA

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    Noelia I. Paredes

    2014-01-01

    Full Text Available En el Hemisferio Sur las turberas almacenan grandes cantidades de carbono en el suelo. A pesar de su importancia en el ciclo global del carbono, se sabe poco acerca de los procesos de descomposición y su diversidad fúngica. El presente estudio se realizó para describir la composición de hongos filamen - tosos en dos profundidades de una turbera compacta donde las especies vegetales predominantes son Astelia (Asteliaceae y Donatia (Donatiaceae en Moat, Tierra del Fuego, Argentina. De 48 muestras procesadas, se obtuvieron 338 aislamientos. Mediante el uso de diferentes metodologías de cultivo, a través de observación microscópica y por métodos moleculares identificamos 38 especies fúngicas y 18 géneros de Ascomycetes y Zygomycetes. Los aislamientos de Ascomycetes fueron los más abundantes, con dominancia de Penicillium y Trichoderma . Se describe la composición fúngica y se comparó la diversidad y equitatividad de las especies a dos profundidades de muestreo. No se encontraron diferencias significativas entre la composición de especies, la diversidad y equitatividad. La turbera estudiada es un ecosistema que presenta alta diversidad de especies fúngicas filamentosas, algunas de ellas descritas en otras turberas en todo el mundo.

  4. Rock Magnetic Properties of Laguna Carmen (Tierra del Fuego, Argentina): Implications for Paleomagnetic Reconstruction

    Science.gov (United States)

    Gogorza, C. G.; Orgeira, M. J.; Ponce, F.; Fernández, M.; Laprida, C.; Coronato, A.

    2013-05-01

    We report preliminary results obtained from a multi-proxy analysis including paleomagnetic and rock-magnetic studies of two sediment cores of Laguna Carmen (53°40'60" S 68°19'0" W, ~83m asl) in the semiarid steppe in northern Tierra del Fuego island, Southernmost Patagonia, Argentina. Two short cores (115 cm) were sampled using a Livingstone piston corer during the 2011 southern fall. Sediments are massive green clays (115 to 70 cm depth) with irregularly spaced thin sandy strata and lens. Massive yellow clay with thin sandy strata continues up to 30 cm depth; from here up to 10 cm yellow massive clays domain. The topmost 10 cm are mixed yellow and green clays with fine sand. Measurements of intensity and directions of Natural Remanent Magnetization (NRM), magnetic susceptibility, isothermal remanent magnetization, saturation isothermal remanent magnetization (SIRM), back field and anhysteretic remanent magnetization at 100 mT (ARM100mT) were performed and several associated parameters calculated (ARM100mT/k and SIRM/ ARM100mT). Also, as a first estimate of relative magnetic grain-size variations, the median destructive field of the NRM (MDFNRM), was determined. Additionally, we present results of magnetic parameters measured with vibrating sample magnetometer (VSM). The stability of the NRM was analyzed by alternating field demagnetization. The magnetic properties have shown variable values, showing changes in both grain size and concentration of magnetic minerals. It was found that the main carrier of remanence is magnetite with the presence of hematite in very low percentages. This is the first paleomagnetic study performed in lakes located in the northern, semiarid fuegian steppe, where humid-dry cycles have been interpreted all along the Holocene from an aeolian paleosoil sequence (Orgeira et el, 2012). Comparison between paleomagnetic records of Laguna Carmen and results obtained in earlier studies carried out at Laguna Potrok Aike (Gogorza et al., 2012

  5. Identificación de los mecanismos subyacentes a la invasión de Castor canadensis (Rodentia en el archipiélago de Tierra del Fuego, Chile Identifying the mechanisms underlying the invasion of Castor canadensis (Rodentia into Tierra del Fuego archipelago, Chile

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    PETRA K WALLEM

    2007-09-01

    conceptual sobre el cual se pueden desarrollar futuras investigaciones referentes a esta invasiónCastor canadensis is considered an archetypical ecosystem engineer, which modifies the state of biotic and abiotic factors through non-trophic interactions. This species was introduced by the Argentinean government into Tierra del Fuego island in 1946, and subsequently colonized autonomously the neighboring islands of Navarino, Dawson and Hoste. Currently this invader occupies contrasting ecosystems such as the Magellan subpolar beech forest and Patagonian scrub and steppe. This ability to colonize contrasting habitats suggests that beaver expansion will be limited mainly by hydrological resources, threatening to colonize the complete extent of temperate beech forests on the mainland (from 35 to 55° S. The present review proposes three hypotheses regarding the underlying mechanisms to this successful invasion: natural enemy escape, resource opportunities, and self-facilitation through non-trophic interactions. Current knowledge regarding beaver colonization and foraging behavior (e.g., habitat selection independently of forest availability, irruptive population growth, and apparent selective exploitation of Nothofagus pumilio, dominant species in the Magellan forest suggests that enemy escape and resource opportunity are the main mechanisms underlying this invasion. The observation of higher densities of active colonies, where the extent of beaver habitat modification is larger, suggests that self-facilitation may be relevant to the success of this invasion. Current information does not allow testing these hypotheses, but it provides a framework to develop future investigations regarding this invasion in Tierra del Fuego

  6. Health at the Extremes. Epidemiological and Sanitary Scene in Tierra del Fuego, 1890-1930

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    Romina Casali

    2014-05-01

    Full Text Available Objective: To characterize the epidemiological and sanitary conditions of the city of Ushuaia (National Territory of Tierra del Fuego at a key time in its history- a time in which interethnic contact and the consolidation of the Argentine nation-state were intensified as two parallel and related processes. Materials and methods: All death certificates available for the period 1890-1930 were analyzed, as well as relevant government documents and secondary sources in order to ob¬tain the health profile of the city and its relationship with the country in the following aspects: type of epidemiological phase, mortality rates, population structure, and the structure in health¬care. Conclusions: There was a great relevance of infectious diseases, and specially tuberculosis, among the population of the city in general, and among the indigenous and criminal population in particular. This epidemiological profile showed the shortcomings of a national health system that was trying to establish at the time, especially in a region difficult to reach.

  7. Functional ecology of soil microbial communities along a glacier forefield in Tierra del Fuego (Chile).

    Science.gov (United States)

    Fernández-Martínez, Miguel A; Pointing, Stephen B; Pérez-Ortega, Sergio; Arróniz-Crespo, María; Green, T G Allan; Rozzi, Ricardo; Sancho, Leopoldo G; de Los Ríos, Asunción

    2016-09-01

    A previously established chronosequence from Pia Glacier forefield in Tierra del Fuego (Chile) containing soils of different ages (from bare soils to forest ones) is analyzed. We used this chronosequence as framework to postulate that microbial successional development would be accompanied by changes in functionality. To test this, the GeoChip functional microarray was used to identify diversity of genes involved in microbial carbon and nitrogen metabolism, as well as other genes related to microbial stress response and biotic interactions. Changes in putative functionality generally reflected succession-related taxonomic composition of soil microbiota. Major shifts in carbon fixation and catabolism were observed, as well as major changes in nitrogen metabolism. At initial microbial dominated succession stages, microorganisms could be mainly involved in pathways that help to increase nutrient availability, while more complex microbial transformations such as denitrification and methanogenesis, and later degradation of complex organic substrates, could be more prevalent at vegetated successional states. Shifts in virus populations broadly reflected changes in microbial diversity. Conversely, stress response pathways appeared relatively well conserved for communities along the entire chronosequence. We conclude that nutrient utilization is likely the major driver of microbial succession in these soils. [Int Microbiol 19(3):161-173 (2016)]. Copyright© by the Spanish Society for Microbiology and Institute for Catalan Studies.

  8. EL SITIO HESHKAIA 35: NUEVOS DATOS SOBRE LA ARQUEOLOGÍA DE MOAT (TIERRA DEL FUEGO, ARGENTINA / Heshkaia 35 site: new data on the archaeology of Moat (Tierra del Fuego, Argentina

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    Atilio Francisco Zangrando

    2014-11-01

    Full Text Available arqueológicos recuperados en el sitio Heshkaia 35 (costa sur de Tierra del Fuego, Argentina. Este sitio se ubica en un ámbito costero en la sección media de la cuenca del río Moat y registra ocupaciones durante el Holoceno Tardío (ca. 800-500 AP. La diversidad tecnológica y el registro zooarqueológico señalan el desarrollo de actividades múltiples. Los artefactos líticos dominan el conjunto tecnológico. Los desechos líticos indican un fuerte énfasis hacia los estadios finales de talla, puesto de manifiesto en la baja presencia de artefactos con corteza y la elevada frecuencia de lascas de formatización y de reactivación de filos. El conjunto zooarqueológico se compone mayormente de restos óseos de guanacos. Los moluscos también habrían cumplido un rol significativo en la dieta. Restos óseos de mamíferos marinos, zorros, aves y peces están representados por frecuencias bajas. La composición artefactual y arqueofaunística estaría indicando que el aprovisionamiento de recursos se habría articulado principalmente desde el ámbito costero y no necesariamente en el mar. Se discuten las implicaciones de esta evidencia para las pautas conductuales de cazadores-recolectores en la costa sur de Tierra del Fuego. Palabras Clave: Arqueología de costas, Cazadores-recolectores, Tierra del Fuego, Holoceno Tardío   Abstract This paper presents and discusses the archaeological evidence from Heshkaia 35 site (southern coast of Tierra del Fuego, Argentina. This site is located in a coastal setting in the middle section of the Moat River Basin and records occupations during the Late Holocene (ca. 800-500 BP. Technological diversity and the zooarchaeological record point to the development of multiple activities. Lithic artifacts dominate the technological assemblage. Lithic debitage indicates a strong emphasis towards final stages of reduction, shown by the lower occurrence of artifacts with cortex and the high frequency resharpening

  9. Fate of a broad spectrum of perfluorinated compounds in soils and biota from Tierra del Fuego and Antarctica

    International Nuclear Information System (INIS)

    Llorca, Marta; Farré, Marinella; Tavano, Máximo Sebastián; Alonso, Bruno; Koremblit, Gabriel; Barceló, Damià

    2012-01-01

    In this study, the presence of 18 perfluorinated compounds was investigated in biota and environmental samples from the Antarctica and Tierra de Fuego, which were collected during a sampling campaign carried out along February and March 2010. 61 samples were analysed including fish, superficial soils, guano, algae, dung and tissues of Papua penguin by liquid chromatography coupled to tandem mass spectrometry. The concentrations of PFCs were ranging from 0.10 to 240 ng/g for most of the samples except for penguin dung, which presented levels between 95 and 603 ng/g for perfluorooctane sulfonate, and guano samples from Ushuaia, with concentration levels of 1190–2480 ng/g of perfluorohexanoic acid. PFCs acids presented, in general, the highest levels of concentration and perfluorooctanesulfonate was the most frequently found compound. The present study provides a significant amount of results, which globally supports the previous studies, related to the transport, deposition, biodegradation and bioaccumulation patterns of PFCs. - Highlights: ► 61 samples from the Antarctica and Tierra de Fuego analysed for the presence of 18 perfluorinated compounds. ► Acid compounds presented the highest levels of concentration and perfluorooctane sulfonate was the most frequently found. ► Concentrations in algae much higher than those in soils. ► Data supporting existing models for the transport, deposition, biodegradation and bioaccumulation patterns are presented. - 18 perfluorinated compounds assessed in biota and environmental samples from Tierra del Fuego and the Antarctica. Concentrations related to Compounds properties.

  10. Mires and mire types of Peninsula Mitre, Tierra del Fuego, Argentina

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    A. Grootjans

    2014-01-01

    Full Text Available In 2007, a field visit by members of the International Mire Conservation Group (IMCG to the Atlantic coast of Peninsula Mitre (the easternmost part of Isla Grande de Tierra del Fuego, Argentina gathered information on mire diversity in this remote wild area with largely pristine mires. Our expedition showed that Peninsula Mitre hosts a wide variety of habitats across two exciting ecological gradients: (i a regional west–east gradient from Sphagnum magellanicum dominated mires in the west to Astelia pumila dominated mires in the east; and (ii a gradient from extremely acid to extremely carbonate rich mire types induced by local bedrock. The large variety of hydromorphological mire types comprises raised bogs, blanket bogs, sloping fens, string fens, flat fens and calcareous spring fens. In the Atlantic coastal area, the abundance of Sphagnum magellanicum in the ombrogenic systems decreases conspicuously from west to east with the species being almost absent in the east. However, the fossil record shows thick layers of Sphagnum peat close beneath mire surfaces everywhere, indicating that substantial hydrological and ecological changes have taken place in the recent past. We observed large scale erosion in the mires along the Atlantic coast. Locally, well-developed fen systems are present, including calcareous spring fens with active travertine (tufa deposition. The regional vegetation can be regarded as a parallel to that of boreal oceanic regions in the northern hemisphere. The mires and peatlands of the peninsula are of global significance. They are impressive, peculiar, extensive and largely pristine mires in a globally very rare climatic and biogeographical context embedded in a landscape with significant natural dynamics. The damaging impact of free-roaming cattle on the mires and upland vegetation is, however, conspicuous and needs urgent attention. Peninsula Mitre deserves the highest possible protection, e.g. as a provincial protected

  11. Estudio de la estructura cortical en la Isla de Tierra del Fuego a partir de datos sismológicos

    OpenAIRE

    Buffoni, C.; Schimmel, Martin; Sabbione, N.C.; Rosa, M.L.

    2012-01-01

    La Isla de Tierra del Fuego (TdF) se encuentra ubicada en el extremo sur de la Cuenca de Magallanes, donde el borde transformante entre la Placa de Scotia y la Sudamericana define el Sistema de Fallas Magallanes-Fagnano (MFS), cuya falla principal tiene un movimiento sinestral. Con el fin de obtener información de la corteza, se realizó un análisis de funciones receptoras (FR) a partir de datos registrados en cinco estaciones sismológicas instaladas en la Isla. Una FR es el resultado de un pr...

  12. Estudios florísticos y ecológicos sobre las algas de agua dulce de turberas de Tierra del Fuego

    OpenAIRE

    Mataloni, María Gabriela

    1994-01-01

    En esta Tesis Doctoral se realizan diversas investigaciones florísticas y ecológicas sobre las algas de turberas de Sphagnum de la provincia de Tierra Fuego. Para ello se condijeron básicamente dos trabajos. en la primera parte se estudiaron ocho ojos de agua pertenecientes a siete turberas ubicadas en el sur de Tierra del Fuego. En cada una de ellas se muestrearon tanto el fitoplancton del agua libre como las algas que viven asociadas a Sphagnum a lo largo de un gradiente ambiental caracteri...

  13. Checklist of the Discomycetes (Fungi of Patagonia, Tierra del Fuego and adjacent antarctic areas

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    Irma J. Gamundí

    2004-01-01

    Full Text Available La información brindada en este catálogo consiste en registrar las especies de hongos pertenecientes a los órdenes Cyttariales, Helotiales, Ostropales, Pezizales, Rhytismatales y Thelebolales (Discomycetes coleccionadas en Patagonia, Tierra del Fuego y áreas adyacentes antárticas (Patagonia. Además datos sobre sus organismos asociados fueron localizados, resumidos, validados y editados. Las fuentes de información fueron las exsiccatae depositadas en colecciones de Argentina y otros países y de las publicaciones listadas en la bibliografía. Otros registros derivaron de observaciones de campo sobre material fresco y colecciones de referencia. La información fue acumulada en un sistema computarizado relacional de datos taxonómicos, nomenclaturales, bibliográficos, de distribución geográfica y de observaciones biológicas. Este sistema permite la acumulación de datos paralelos en diferentes idiomas, y distingue la información original de la opinión corriente de lo que puede significar esa información. En la Biological Records Database, 5029 registros fueron creados para observaciones sobre la ocurrencia temporal y espacial de los organismos vivos de la región. De éstos, 2613 corresponden a registros de colecciones de Discomycetes de la Patagonia y Tierra del Fuego, con la siguiente distribución: 1854 para a la Argentina, 687 para Chile y 72 para áreas adyacentes antárticas. Excluyendo los sinónimos, los Discomycetes están representados por 361 especies y taxones subespecíficos (160 géneros, 22 familias y 7 órdenes. Los registros remanentes fueron de organismos asociados con los Discomycetes: 163 animales (8 especies, 8 géneros, 6 familias y 5 órdenes; 2 Chromista; 223 hongos (52 especies, 54 géneros, 26 familias y 13 ódenes; 2028 plantas (159 especies, 122 géneros, 59 familias y 39 órdenes. Cada uno de estos taxones (y cada sinónimo conocido está representado por un registro separado en la Base de Datos Taxon

  14. Comportamiento del fuego en un pastizal del sitio ecológico ‘media loma’, región chaqueña occidental (Argentina

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    BRAVO, S

    2012-04-01

    Full Text Available ResumenEl comportamiento del fuego es uno de los componentes de la ecología del fenómeno y su caracterización es necesaria para su manejo y control. El objetivo de este trabajo fue caracterizar el comportamiento del fuego en un pastizal ubicado en el sitio ecológico ‘media loma’ ubicado en el Campo Experimental ´La María´, INTA EEA Santiago del Estero (28º 03’ S 64º 15’ E en una posición intermedia del paisaje, entre el bosque de dos quebrachos y la sabana. El fuego se aplicó en seis parcelas de dos sitios de estudio, estimándose la composición botánica, la carga de combustible fino y la densidad aparente del combustible en función de la altura en cada una de ellas. El comportamiento del fuego se caracterizó mediante la estimación de la velocidad de avance del frente de fuego y la longitud de llamas. Los datos obtenidos se analizaron mediante análisis de la varianza empleando ´sitio de estudio´ como variable independiente. Las correlaciones entre variables fueron evaluadas mediante el coeficiente de correlación de Kendall (τ. Aunque ubicados en un mismo sitio ecológico, los sitios de estudio presentaron dominancia diferencial de dos especies nativas, Trichloris pluriflora (E. Fournier y Pappophorum pappipherum (Lam. Kuntze. Las dos especies poseen diferente proporción de tallo y hoja en su biomasa aérea, diferencia que se reflejó en la carga de combustible fino y su densidad aparente (p > F = 0,0001 en ambos casos y en la velocidad de avance del frente de fuego (p >F = 0.0001. Esta última fue de 28 m*min-1 en el sitio de estudio 1, con dominancia de la primera especie; y 21 m*.min-1 en el sitio de estudio 2, con dominancia de la segunda, respectivamente. La longitud de llamas promedio fue de 3,5 m, pero superó los 6 m cuando participaron en la propagación del fuego especies arbustivas que poseen aceites esenciales y resinas en su follaje. Se observó correlación positiva y significativa (p F = 0,0001 in both

  15. Comentarios sobre la situación actual del fuego y su relación con la madera

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    Elvira Martín, Luis Miguel

    1987-10-01

    Full Text Available The history and importance of various agencies connected with the study of fire in our country is briefly set forth. Fundamental concepts in this field and their effect on fires are defined, while the behavior of wood with respect to other materials is analyzed. After an analysis of the current legislative situation regarding fires, the article ends by setting forth various problems fire poses for consumers and industry.

    Se expone brevemente la historia e intervención de los distintos Organismos en el estudio del fuego en nuestro país. Se definen conceptos fundamentales en este campo y su incidencia en el incendio, pasando revista al comportamiento de la madera en comparación con otros materiales. Junto con el análisis de la legislación y normalización, se termina exponiendo diversos problemas que se plantean en el campo del fuego al usuario y a la industria.

  16. Diversity of endosymbiotic Nostoc in Gunnera magellanica from Tierra del Fuego, Chile [corrected].

    Science.gov (United States)

    Fernández-Martínez, M A; de Los Ríos, A; Sancho, L G; Pérez-Ortega, S

    2013-08-01

    Global warming is causing ice retreat in glaciers worldwide, most visibly over the last few decades in some areas of the planet. One of the most affected areas is the region of Tierra del Fuego (southern South America). Vascular plant recolonisation of recently deglaciated areas in this region is initiated by Gunnera magellanica, which forms symbiotic associations with the cyanobacterial genus Nostoc, a trait that likely confers advantages in this colonisation process. This symbiotic association in the genus Gunnera is notable as it represents the only known symbiotic relationship between angiosperms and cyanobacteria. The aim of this work was to study the genetic diversity of the Nostoc symbionts in Gunnera at three different, nested scale levels: specimen, population and region. Three different genomic regions were examined in the study: a fragment of the small subunit ribosomal RNA gene (16S), the RuBisCO large subunit gene coupled with its promoter sequence and a chaperon-like protein (rbcLX) and the ribosomal internal transcribed spacer (ITS) region. The identity of Nostoc as the symbiont was confirmed in all the infected rhizome tissue analysed. Strains isolated in the present study were closely related to strains known to form symbioses with other organisms, such as lichen-forming fungi or bryophytes. We found 12 unique haplotypes in the 16S rRNA (small subunit) region analysis, 19 unique haplotypes in the ITS region analysis and 57 in the RuBisCO proteins region (rbcLX). No genetic variability was found among Nostoc symbionts within a single host plant while Nostoc populations among different host plants within a given sampling site revealed major differences. Noteworthy, interpopulation variation was also shown between recently deglaciated soils and more ancient ones, between eastern and western sites and between northern and southern slopes of Cordillera Darwin. The cell structure of the symbiotic relationship was observed with low-temperature scanning

  17. Inferencias paleodietarias mediante isótopos estables en restos óseos humanos provenientes de Tierra del Fuego, Argentina

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    Schinder, Gala

    2003-01-01

    Full Text Available Las actuales lineas de acción vinculadas al uso de isótopos estables en la Isla Grande de Tierra del Fuego están orientándose a acotar factores de variación (especialmente la variación espacial y temporal y al cruce con otras lineas de evidencias como los estilos de vida. A partir de la ocupación europea en el Siglo XVIII se modificó el estilo de vida de las poblaciones históricas de la región. El presente trabajo tiene como objetivos explorar la variabilidad en cuanto al tipo de recursos consurnidos por hombres y mujeres a partir de la información isotópica obtenida de huesos de individuos provenientes de diferentes sectores geográficos (Norte, Sudeste y Beagle y la determinación de la composición de la dieta en términos de contenido proteico. Los datos isotópicos se complementaron con información etnográfica. El análisis Kruskal-Wallis sugiere que existen diferencias significativas entre los diferentes sectores geográficos, pero no se registraron diferencias significativas entre hombres y mujeres. Asimismo, los isótopos indican que los individuos del Sudeste consumían preferentemente dietas más ricas en proteínas que sus vecinos del norte de la Isla. En los últimos años, ha crecido el interé por los estudios orientados al análisis de la división sexual del trabajo en sociedades cazadoras recolectoras. Este trabajo constituye un primer aporte para evaluar la variabilidad en cuanto a las diferencias en la obtención de recursos entre sexos y el tipo de dieta en individuos históricos de Tierra del Fuego.

  18. Un suelo referible al periodo calido medieval en Patagonia Austral y Tierra del Fuego (Argentina. Aspectos cronologicos y paleoclimaticos

    Directory of Open Access Journals (Sweden)

    Favier Dubois, C. M.

    2002-08-01

    Full Text Available Geoarchaeological work done in Southernmost Patagonia and in the north of Tierra del Fuego, have revealed the recurrent presence of a paedogenesis interval represented by a soil of an A-AC-C profile, with a mollic epipedon, in the upper section of eolian and colluvial deposits of the late Holocene. This soil is today buried in the sites that have been analyzed, while it remains exposed in other areas of the landscape. Radiocarbon dates obtained on materials placed below it (maximum ages and those obtained by OCR (Oxidizable Carbon Ratio in the AC horizon of this soil (minimum ages, indicate the beginning of its development around the year 1000 BP. Its chronology and environmental implications suggest a relationship with the medieval climatic fluctuations called Medieval Warm Period or Medieval Optimum in Europe. This period has correlates detected in Patagonia by dendroclimatic studies.Estudios geoarqueológicos realizados en 5 localidades de Patagonia austral y norte Tierra del Fuego han revelado la recurrente presencia de un suelo de perfil A-AC-C, de epipedon mólico, en depósitos eólicos y coluviales del Holoceno tardío. Este suelo se observa sepultado en los yacimientos arqueológicos analizados, mientras que permanece expuesto en otras posiciones del paisaje. Numerosas edades máximas y mínimas obtenidas por 14C y por la técnica de OCR (Oxidizable Carbon Ratio indican el comienzo de su desarrollo hacia el 1000 AP. Su cronología e implicancias ambientales permiten vincularlo con fluctuaciones climáticas desarrolladas durante el denominado Período Cálido Medieval u Optimo Medieval Europeo, con correlatos detectados en Patagonia a través de estudios dendroclimáticos.

  19. Influencia del tratamiento «a fuego» en las características del estuco tradicional con cal

    Directory of Open Access Journals (Sweden)

    González-Yunta, F.

    2015-03-01

    Full Text Available This research advances in the attempt to recover the traditional technique of stucco by fire; paradigm of indoor decoration until half of 20th century due to its high quality marbled imitations. On its implementation process, it was used lime mortars with marble aggregates, mineral pigments and greases. With these materials, masses were prepared and extended into the walls, they were painted in fresco and ended with the passage of a heated metal tool. As with any other technique, the time passing over has blurred the knowledge on the subject, making very difficult the preservation or restoration of examples in our heritage. Despite of the limited literature, the process has been recovered; subjecting the samples prepared at different trials that have characterized the finished, both in its merits and its conferred characteristics by finally protecting the samples with a layer of wax, as was done traditionally.Esta investigación avanza en el intento de recuperar la técnica tradicional del estuco a fuego, paradigma de la decoración de espacios interiores hasta la mitad del s. XX por sus imitaciones marmóreas de gran calidad. Para ejecutarlos se utilizaban morteros de cal con áridos de mármol, pigmentos minerales y grasas; con estos materiales se preparaban y tendían las masas, se pintaban al fresco y se terminaban con el paso de una herramienta metálica caliente. Como sucede con otras técnicas, el paso del tiempo ha difuminado los conocimientos sobre la materia, haciendo muy difícil la conservación o restauración de los ejemplos en nuestro patrimonio. A partir de la escasa bibliografía existente se ha recuperado el proceso, sometiendo las muestras elaboradas a diferentes ensayos que han caracterizado el acabado final, tanto en sus características intrínsecas como en las que le son conferidas al proteger finalmente las muestras con una capa de cera, tal y como se realizaba tradicionalmente.

  20. Identifying potential differences in ontogentic ages between modern and archaeological Nacella deaurata shells, Tierra del Fuego, Argentina

    Science.gov (United States)

    Surge, D. M.; Godino, I. B. I.; Álvarez, M.; López, M. B. I.

    2017-12-01

    Patelloid limpet shells are common constituents of rocky shore habitats along the eastern Atlantic basin and are often found in archaeological shell middens. Nacella deaurata is an intertidal species found in the Magellanic Province along the southern tip of South America. Recent discoveries of archaeological shell middens in Tierra del Fuego, Argentina, identify N. deaurata as one of the abundant shells in these deposits. Preliminary observations reveal that modern N. deaurata shells achieve larger sizes compared to those found in the archaeological middens. Here, we provide preliminary data to test the hypothesis that the larger, modern specimens grow to older ontogenetic ages than the smaller archaeological specimens. Our results may provide insights into harvesting pressures on this species during the time when the archaeological sites were inhabited. Understanding their annual growth patterns also has important implications for generating oxygen isotope proxy data to reconstruct seasonal variation in sea surface temperature.

  1. Effect of resource spatial correlation and hunter-fisher-gatherer mobility on social cooperation in Tierra del Fuego.

    Directory of Open Access Journals (Sweden)

    José Ignacio Santos

    Full Text Available This article presents an agent-based model designed to explore the development of cooperation in hunter-fisher-gatherer societies that face a dilemma of sharing an unpredictable resource that is randomly distributed in space. The model is a stylised abstraction of the Yamana society, which inhabited the channels and islands of the southernmost part of Tierra del Fuego (Argentina-Chile. According to ethnographic sources, the Yamana developed cooperative behaviour supported by an indirect reciprocity mechanism: whenever someone found an extraordinary confluence of resources, such as a beached whale, they would use smoke signals to announce their find, bringing people together to share food and exchange different types of social capital. The model provides insight on how the spatial concentration of beachings and agents' movements in the space can influence cooperation. We conclude that the emergence of informal and dynamic communities that operate as a vigilance network preserves cooperation and makes defection very costly.

  2. Información molecular obtenida a partir de pieles de la colección del Museo Regional Fagnano, Río Grande, Tierra del Fuego

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    Petrigh, Romi

    2014-10-01

    Full Text Available En el presente trabajo se aplicaron técnicas moleculares sobre muestras poco conservadas de pieles depositadas en la colección del Museo Regional Monseñor Fagnano, Tierra del Fuego, Argentina, con el objetivo de identificar la especie con la que fueron confeccionadas. Se extrajeron pelos de mantas realizadas con pieles de guanaco (Lama guanicoe por Selk’nam y de una piel de puma (Puma concolor procedente de la provincia de Santa Cruz. Ambas muestras se encontraban almacenadas en el Museo Regional Monseñor Fagnano y en la Misión Salesiana Candelaria en Rio Grande, Tierra del Fuego, Argentina. La extracción de ADN de los fragmentos de pelos de 5mm de longitud se realizó en un buffer de lisis PCR-compatible. Se amplificaron por PCR fragmentos específicos de ADN mitocondrial y se secuenciaron. Las secuencias fueron comparadas con las depositadas en la base de secuencias de nucleótidos del National Center for Biotechnology Information (NCBI de Estados Unidos. La aplicación de técnicas moleculares permitió recuperar secuencias de ADN de muestras de pieles con un estado de conservación poco óptimo para análisis genéticos, pudiendo extenderse a otras fuentes de pelos como las fibras textiles de origen arqueológico de la región.

  3. Prometeo, el fuego y la esperanza: una posible cura del SIDA

    OpenAIRE

    Crisci, Jorge Víctor

    1993-01-01

    Prometeo fue castigado por los dioses por haber entregado el fuego sagrado a los hombres. Hoy el espíritu prometeico de la ciencia es reclamado una vez más para luchar contra flagelos de la humanidad como el cáncer o el SIDA. La botánica, entre muchas otras disciplinas científicas que trabajan sobre el tema, parece sugerir alternativas alentadoras. Sección: Divulgación Científica. Fundación Museo La Plata

  4. Reciente invasión del Archipiélago de Tierra del Fuego por la avispa Vespula germanica (Hymenoptera: Vespidae

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    Francisco J. SOLA

    2015-01-01

    Full Text Available Vespula germanica es una especie invasora de nivel mundial que ha sido detectada en la Patagonia continental de la Argentina y Chile. En este trabajo, ampliamos el rango de distribución de este véspido de la Patagonia, al Archipiélago de Tierra del Fuego. Indicamos ubicación, año y ambiente de cada avistamiento y/o captura. El patrón de expansión indicaría que esta especie está bien establecida tanto en áreas naturales como antrópicas, y probablemente ha dependido del transporte humano para llegar desde el continente. Esta comunicación breve sirve también para tomar medidas prácticas de mitigación y control de esta especie, incluyendo información básica para que la ciudadanía tome conciencia sobre su presencia y esto ayude a evitar su transporte a nuevos lugares. Finalmente, se recomienda mayor investigación para el manejo y control de esta especie invasora en Tierra del Fuego.

  5. Seismically-induced soft-sediment deformation structures associated with the Magallanes-Fagnano Fault System (Isla Grande de Tierra del Fuego, Argentina)

    Science.gov (United States)

    Onorato, M. Romina; Perucca, Laura; Coronato, Andrea; Rabassa, Jorge; López, Ramiro

    2016-10-01

    In this paper, evidence of paleoearthquake-induced soft-sediment deformation structures associated with the Magallanes-Fagnano Fault System in the Isla Grande de Tierra del Fuego, southern Argentina, has been identified. Well-preserved soft-sediment deformation structures were found in a Holocene sequence of the Udaeta pond. These structures were analyzed in terms of their geometrical characteristics, deformation mechanism, driving force system and possible trigger agent. They were also grouped in different morphological types: sand dykes, convolute lamination, load structures and faulted soft-sediment deformation features. Udaeta, a small pond in Argentina Tierra del Fuego, is considered a Quaternary pull-apart basin related to the Magallanes-Fagnano Fault System. The recognition of these seismically-induced features is an essential tool for paleoseismic studies. Since the three main urban centers in the Tierra del Fuego province of Argentina (Ushuaia, Río Grande and Tolhuin) have undergone an explosive growth in recent years, the results of this study will hopefully contribute to future analyses of the seismic risk of the region.

  6. A Geochemical and Sedimentary Record of High Southern Latitude Holocene Climate Evolution from Lago Fagnano, Tierra del Fuego

    Energy Technology Data Exchange (ETDEWEB)

    Moy, C M; Dunbar, R B; Guilderson, T P; Waldmann, N; Mucciarone, D A; Recasens, C; Austin, J A; Anselmetti, F S

    2010-11-19

    Situated at the southern margin of the hemispheric westerly wind belt and immediately north of the Antarctic Polar Frontal zone, Tierra del Fuego is well-positioned to monitor coupled changes in the ocean-atmosphere system of the high southern latitudes. Here we describe a Holocene paleoclimate record from sediment cores obtained from Lago Fagnano, a large lake in southern Tierra del Fuego at 55{sup o}S, to investigate past changes in climate related to these two important features of the global climate system. We use an AMS radiocarbon chronology for the last 8,000 years based on pollen concentrates, thereby avoiding contamination from bedrock-derived lignite. Our chronology is consistent with a tephrochronologic age date for deposits from the middle Holocene Volcan Hudson eruption. Combining bulk organic isotopic ({delta}{sup 13}C and {delta}{sup 15}N) and elemental (C and N) parameters with physical sediment properties allow us to better understand sediment provenance and transport mechanisms and to interpret Holocene climate and tectonic change during the last 8,000 years. Co-variability and long-term trends in C/N ratio, carbon accumulation rate, and magnetic susceptibility reflect an overall Holocene increase in the delivery of terrestrial organic and lithogenic material to the deep eastern basin. We attribute this variability to westerly wind-derived precipitation. Increased wind strength and precipitation in the late Holocene drives the Nothofagus forest eastward and enhances run-off and terrigenous inputs to the lake. Superimposed on the long-term trend are a series of abrupt 9 negative departures in C/N ratio, which constrain the presence of seismically-driven mass flow events in the record. We identify an increase in bulk {delta}{sup 13}C between 7,000 and 5,000 cal yr BP that we attribute to enhanced aquatic productivity driven by warmer summer temperatures. The Lago Fagnano {delta}{sup 13}C record shows similarities with Holocene records of sea surface

  7. Pathogenic and enzyme activities of the entomopathogenic fungus Tolypocladium cylindrosporum (Ascomycota: Hypocreales from Tierra del Fuego, Argentina

    Directory of Open Access Journals (Sweden)

    Ana C Scorsetti

    2012-06-01

    Full Text Available Tolypocladium cylindrosporum is an entomopathogenic fungi that has been studied as a biological control agent against insects of several orders. The fungus has been isolated from the soil as well as from insects of the orders Coleoptera, Lepidoptera, Diptera and Hymenoptera. In this study, we analyzed the ability of a strain of T. cylindrosporum, isolated from soil samples taken in Tierra del Fuego, Argentina, to produce hydrolytic enzymes, and to study the relationship of those activities to the fungus pathogenicity against pest aphids. We have made the traditional and molecular characterization of this strain of T. cylindrosporum. The expression of hydrolase activity in the fungal strain was estimated at three incubation temperatures (4ºC, 12ºC and 24ºC, on different agar media supplemented with the following specific substrates: chitin azure, Tween ® 20, casein, and urea for chitinase, lipase, protease, and urease activity, respectively. The hydrolytic-enzyme activity was estimated qualitatively according to the presence of a halo of clarification through hydrolase action, besides was expressed semi-quantitatively as the ratio between the hydrolytic-halo and colony diameters. The pathogenicity of the fungus was tested on adults of the aphid Rhopalosiphum padi at three temperatures of incubation (4ºC, 12ºC and 24ºC. The suspension was adjusted to a concentration of 1x10 7 conidia/ml. In pathogenicity assays at seven days post-inoculation, the fungus caused the mortality of adults of Ropalosiphum padi at different temperatures also showed a broad ability to grow on several agar-culture media, supplemented with different carbon sources at the three incubation temperatures tested. Although, the growth was greater with higher incubation temperatures (with maximum levels at 24°C, the fungus reached similar colony diameters after 15 days of incubation on the medium supplemented with Tween® 20 at the lower two incubation temperatures of 4

  8. Caracterización de suelos bajo bosques de Nothofagus betuloides (Mirb Blume, en Tierra del Fuego, Chile Characterization of soils of Nothofagus betuloides (Mirb Blume forests, in Tierra del Fuego, Chile

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    VÍCTOR GERDING

    2002-12-01

    Full Text Available En tres sectores de la parte occidental de Tierra del Fuego (54º45'-54º15' S, 68º40'-70º10' O se caracterizó morfológica, física y químicamente los suelos bajo bosques de coigüe de Magallanes (Nothofagus betuloides (Mirb Blume y sus especies asociadas lenga (Nothofagus pumilio (P. et E. Krasser y canelo (Drimys winteri Forst.. Se describieron 85 perfiles de suelo y aproximadamente 250 observaciones con bastón pedológico. Los suelos bajo coigüe de Magallanes eran jóvenes, muy influidos por la actividad volcánica, topografía y clima. Se observó la presencia de los órdenes Spodosol e Iceptisol, principalmente. En general los suelos eran delgados a muy delgados (mayoritariamente entre 10 y 40 cm, con un alto volumen de esqueleto, textura franca, estructura masiva a granular, capacidad de agua aprovechable baja y drenaje externo e interno moderado a lento. Además, presentan una alta acidez (pH 4-5,5, una baja oferta nutricional y muy altos niveles de saturación de aluminio (promedio > 60 %. El mantillo (Oe/Oa presentó condiciones adecuadas para el desarrollo radicular. Existe comúnmente un horizonte blanco (frecuentemente 10 YR 5/1-2 inmediatamente debajo del mantillo, con textura franco limosa y estructura masiva, con arraigamiento muy bajo. Se plantea como hipótesis que este horizonte se originó por depósitos de cenizas volcánicas y procesos de podzolización. Se concluye que la fertilidad de estos suelos es baja debido a limitantes físicas (dificultades de arraigamiento y químicas (acidez, toxicidad de aluminio, baja oferta de basesSoils under coigüe de Magallanes (Nothofagus betuloides (Mirb Blume forests, located in the oriental part of Tierra del Fuego (54º45'-54º15' S, 68º40'-70º10' W, were characterized morphologically, physically and chemically. Associated tree species were lenga (Nothofagus pumilio (P. et E. Krasser and canelo (Drimys winterii Forst.. A total of 85 soil profiles and approximately 250 soil

  9. Transferring Knowledge Gained From a Field Experience in Tierra del Fuego, the Uttermost Part of the Earth, to Central Texas Science Classrooms

    Science.gov (United States)

    Ormiston, C.; Dovzak, N.; Anderson, S.; Perry, E.; Ellins, K.; Tingle, D.; Knettel, P.; Redding, S.; Odle, K.

    2005-12-01

    As part of the UTIG's Teachers in the Field program, we, three teachers from Boerne High School in south-central Texas, and four of our students, collaborated with an international team of geoscientists studying the tectonic and climatic evolution of the Lago Fagnano region in Tierra del Fuego, Argentina, in March 2005. This unique field experience allowed us to participate in all aspects of the scientific process: the consideration of research questions, development of a research plan, collection of field data and observations, and synthesis and presentation of results. In addition to field work and reconnaissance tied directly to the project objectives, we characterized the modern chemical/physical soil and water parameters (temperature, pH, dissolved oxygen, NH4 content, etc.) and isotopic (18O and D) composition of the Lago Fagnano watershed. These data are now integrated into an existing database of comparable chemical/physical information gathered for North American sites through our summer field courses. We will utilize this rich data set to make Texas-Tierra del Fuego ecosystem comparisons with our classes. The level of mentoring, preparation and follow-up provided by an NSF GK-12 Fellow was a key factor contributing to the success of our experience and an important element in helping us transfer components of this challenging experience to our students. Before, during, and following a two-week field season at Lago Fagnano, we and our students were actively engaged as learners and as scientists. We acquired concepts and skills that are readily applicable in a classroom setting: geologic mapping, GIS applications, isotopic data collection and analysis, tectonics concepts, and a general understanding of how science is truly conducted. Other factors that contributed to a positive experience included the team of dynamic scientists, who encouraged, helped and inspired us, the strong support that we received from our high school campus and district level

  10. Influencia del fuego en la evolución de un suelo arenoso

    OpenAIRE

    Siljeström, Patricia; Clemente Salas, Luis

    1987-01-01

    14 páginas, 2 tablas, 2 perfiles, 13 referencias. Este trabajo se presentó como Comunicación a la VII Reunión sobre el Cuaternario de la Asociación Española para el Estudio del Cuaternario, celebrada en Santander, en 1987. Páginas 73-76, Capítulo II: Edafología, del libro de Actas.

  11. Mass balance evolution of Martial Este Glacier, Tierra del Fuego (Argentina for the period 1960–2099

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    M. Buttstädt

    2009-12-01

    Full Text Available The Martial Este Glacier in southern Tierra del Fuego was studied in order to estimate the surface mass balance from 1960 until 2099. For this reason a degree-day model was calibrated. Air temperature and precipitation data obtained from 3 weather stations as well as glaciological measurements were applied. The model was driven using a vertical air temperature gradient of 0.69 K/100 m, a degree-day factor for snow of 4.7 mm w.e. K−1 day−1, a degree-day factor for ice of 9.4 mm w.e. K−1 day−1 and a precipitation gradient of 22%/100 m. For the purpose of surface mass balance reconstruction for the time period 1960 until 2006 a winter vertical air temperature gradient of 0.57 K/100 m and a summer vertical air temperature gradient of 0.71 K/100 m were added as well as a digital terrain model. The key finding is an almost continuous negative mass balance of −772 mm w.e. a−1 throughout this period. While the calculation of the mass balance for the period 1960–2006 is based on instrumental records, the mass balance for the years 2007 until 2099 was estimated based on the IPCC SRES A2-scenario. To accomplish this estimation, the dataset of the global climate model HadCM3 was statistically downscaled to fit local conditions at Martial Este Glacier. Subsequently, the downscaled air temperature and precipitation were applied to a volume-area scaling glacier change model. Findings reveal an enduring deglaciation resulting in a surface area reduction of nearly 93% until 2099. This implicates that the Martial Este Glacier might be melted off at the beginning of the 22nd century.

  12. Rayleigh waves from correlation of seismic noise in Great Island of Tierra del Fuego, Argentina: Constraints on upper crustal structure

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    Carolina Buffoni

    2018-01-01

    Full Text Available In this study, the ambient seismic noise cross-correlation technique is applied to estimate the upper structure of the crust beneath Great Island of Tierra del Fuego (TdF, Argentina, by the analysis of short-period Rayleigh wave group velocities. The island, situated in the southernmost South America, is a key area of investigation among the interaction between the South American and Scotia plates and is considered as a very seismically active one. Through cross-correlating the vertical components of ambient seismic noise registered at four broadband stations in TdF, we were able to extract Rayleigh waves which were used to estimate group velocities in the period band of 2.5–16 s using a time-frequency analysis. Although ambient noise sources are distributed inhomogeneously, robust empirical Green's functions could be recovered from the cross-correlation of 12 months of ambient noise. The observed group velocities were inverted considering a non-linear iterative damped least-squares inversion procedure and several 1-D shear wave velocity models of the upper crust were obtained. According to the inversion results, the S-wave velocity ranges between 1.75 and 3.7 km/s in the first 10 km of crust, depending on the pair of stations considered. These results are in agreement to the major known surface and sub-surface geological and tectonic features known in the area. This study represents the first ambient seismic noise analysis in TdF in order to constraint the upper crust beneath this region. It can also be considered as a successful feasibility study for future analyses with a denser station deployment for a more detailed imaging of structure.

  13. VOCES EN EL BOSQUE: EL USO DE RECURSOS VEGETALES ENTRE CAZADORES-RECOLECTORES DE LA ZONA CENTRAL DE TIERRA DEL FUEGO

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    Laura Caruso

    2008-01-01

    Full Text Available Se estudiaron las modalidades de aprovechamiento de las plantas entre los Selknam de Tierra del Fuego (Argentina y se presentan aquí los resultados obtenidos a partir del análisis de los restos de madera carbonizada y sin carbonizar del sitito Ewan, ocupado a principios del siglo XX para la realización de un ritual de iniciación. Los resultados permitieron una mejor comprensión de las estrategias de aprovechamiento de las plantas entre las sociedades cazadoras-recolectoras. La identificación de las especies empleadas y el registro de las principales características morfométricas permitió documentar el aprovechamiento del "ñire" (Nothofagus antarctica. Esta especie, dominante en el entorno, fue utilizada para la construcción de la vivienda y como combustible. En ambos casos se seleccionaron troncos de forma y tamaño adecuados. Los resultados del trabajo arqueobotánico y su confrontación con los datos etnográficos evidenciaron la importancia de los recursos vegetales dentro de la dinámica socioeconómica de este grupo humano. Los recursos vegetales, más allá de su rol alimentario, fueron relevantes en otros aspectos tales como la tecnología, la construcción, el combustible y debieron constituir una ventaja considerable en el ámbito de los bosques de la zona central de Tierra del Fuego.

  14. Propiedades magnéticas y micromorfología de suelos en el sitio arqueológico Marazzi 2, Isla Grande de Tierra del Fuego, Chile

    OpenAIRE

    Ozán, Ivana Laura; Orgeira, Maria Julia

    2017-01-01

    El objetivo del presente trabajo es investigar el origen de la señal magnética (natural y/o antrópica) y su vinculación con la micromorfología de suelos, en dos perfiles del sitio arqueológico Marazzi 2, perteneciente al Holoceno tardío y ubicado en el noroeste de la Isla Grande de Tierra del Fuego (Chile). Los resultados muestran que el perfil P1 presenta un pico de la señal magnética (presencia de magnetita y/o titanomagnetita) entre los 30 - 70 cm, que coincide con un horizonte Ab y ABb en...

  15. 'Los avisadores del fuego': Franz Rosenzweig, Walter Benjamin y Franz Kafka

    OpenAIRE

    Mate, M. Reyes; Mayorga, Juan

    2000-01-01

    Hubo pensadores que supieron leer en su tiempo signos de la catástrofe venidera. No eran profetas sino finos analistas. Nos referimos a Rosenzweig, Benjamin y Kafka. Rosenzweig denunció en el "idealismo" de la filosofía que viene desde Jonia y llega hasta Jena la tendencia a un totalitarismo que la convertía en potencialmente en una "ontología de la guerra". Benjamin dejó constancia de la ambigüedad radical del concepto de progreso, tan fundamental para el pensamiento ilustrado. La barbarie, ...

  16. 3D modelling of the Salesian mission Nuestra Señora de la Candelaria cemetery (Río Grande, Tierra del Fuego, Argentina

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    Melisa A. Salerno

    2017-07-01

    Full Text Available The Salesian mission Nuestra Señora de La Candelaria operated between the late 19th and the mid-20th centuries in Río Grande (Tierra del Fuego, Argentina. Its cemetery still holds the remains of indigenous and religious people who lived in the institution, and settlers who lived nearby. For some years, the place has received the attention of a research project interested in discussing the dynamics of colonial relationships in Tierra del Fuego. The cemetery has a long history of changes, and even though it was declared part of the national and provincial heritage, its preservation conditions are relatively poor. In this article we present the work carried out to produce a 3D model of the cemetery, combining information obtained by planialtimetric and photographic survey. The result represents a detailed and photorealistic record of the materiality of the cemetery at present. Therefore, it does not only provide a relevant tool to colaborate in the promotion and protection of the archaeological heritage. It also provides a platform for future 3D modelling of historical images of the cemetery, with different research goals.

  17. Pathogenic and enzyme activities of the entomopathogenic fungus Tolypocladium cylindrosporum (Ascomycota: Hypocreales from Tierra del Fuego, Argentina

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    Ana C Scorsetti

    2012-06-01

    Full Text Available Tolypocladium cylindrosporum is an entomopathogenic fungi that has been studied as a biological control agent against insects of several orders. The fungus has been isolated from the soil as well as from insects of the orders Coleoptera, Lepidoptera, Diptera and Hymenoptera. In this study, we analyzed the ability of a strain of T. cylindrosporum, isolated from soil samples taken in Tierra del Fuego, Argentina, to produce hydrolytic enzymes, and to study the relationship of those activities to the fungus pathogenicity against pest aphids. We have made the traditional and molecular characterization of this strain of T. cylindrosporum. The expression of hydrolase activity in the fungal strain was estimated at three incubation temperatures (4ºC, 12ºC and 24ºC, on different agar media supplemented with the following specific substrates: chitin azure, Tween ® 20, casein, and urea for chitinase, lipase, protease, and urease activity, respectively. The hydrolytic-enzyme activity was estimated qualitatively according to the presence of a halo of clarification through hydrolase action, besides was expressed semi-quantitatively as the ratio between the hydrolytic-halo and colony diameters. The pathogenicity of the fungus was tested on adults of the aphid Rhopalosiphum padi at three temperatures of incubation (4ºC, 12ºC and 24ºC. The suspension was adjusted to a concentration of 1x10 7 conidia/ml. In pathogenicity assays at seven days post-inoculation, the fungus caused the mortality of adults of Ropalosiphum padi at different temperatures also showed a broad ability to grow on several agar-culture media, supplemented with different carbon sources at the three incubation temperatures tested. Although, the growth was greater with higher incubation temperatures (with maximum levels at 24°C, the fungus reached similar colony diameters after 15 days of incubation on the medium supplemented with Tween® 20 at the lower two incubation temperatures of 4

  18. Pathogenic and enzyme activities of the entomopathogenic fungus Tolypocladium cylindrosporum (Ascomycota: Hypocreales) from Tierra del Fuego, Argentina.

    Science.gov (United States)

    Scorsetti, Ana C; Elíades, Lorena A; Stenglein, Sebastián A; Cabello, Marta N; Pelizza, Sebastián A; Saparrat, Mario C N

    2012-06-01

    Tolypocladium cylindrosporum is an entomopathogenic fungi that has been studied as a biological control agent against insects of several orders. The fungus has been isolated from the soil as well as from insects of the orders Coleoptera, Lepidoptera, Diptera and Hymenoptera. In this study, we analyzed the ability of a strain of T cylindrosporum, isolated from soil samples taken in Tierra del Fuego, Argentina, to produce hydrolytic enzymes, and to study the relationship of those activities to the fungus pathogenicity against pest aphids. We have made the traditional and molecular characterization of this strain of T cylindrosporum. The expression of hydrolase activity in the fungal strain was estimated at three incubation temperatures (4 degreeC, 12 degreeC and 24 degreeC), on different agar media supplemented with the following specific substrates: chitin azure, Tween 20, casein, and urea for chitinase, lipase, protease, and urease activity, respectively. The hydrolytic-enzyme activity was estimated qualitatively according to the presence of a halo of clarification through hydrolase action, besides was expressed semi-quantitatively as the ratio between the hydrolytic-halo and colony diameters. The pathogenicity of the fungus was tested on adults of the aphid Rhopalosiphum padi at three temperatures of incubation (4 degree C, 12 degree C and 24 degree C). The suspension was adjusted to a concentration of 1x10(7) conidia/ml. In pathogenicity assays at seven days post-inoculation, the fungus caused the mortality of adults of Ropalosiphum padi at different temperatures also showed a broad ability to grow on several agar-culture media, supplemented with different carbon sources at the three incubation temperatures tested. Although, the growth was greater with higher incubation temperatures (with maximum levels at 24 degreeC), the fungus reached similar colony diameters after 15 days of incubation on the medium supplemented with Tween 20 at the lower two incubation

  19. Fuego y acero

    Directory of Open Access Journals (Sweden)

    Sfintesco, D.

    1965-03-01

    Full Text Available In a brief and appealing manner the author analysis the basic considerations which should be taken into account to deal effectively with the safety of steel structures in case of fire. He makes it clear that the safety measures must not be the result of a rather intuitive and hasty reaction to the possibility of a fire: for example, the costly covering of steel columns with fire resisting material, which in most cases is not necessary. A careful assessment of possible risks must be made, available means to reduce these must be adopted, and the potential losses in case of fire must be taken into account. The article is completed with a brief commentary on the new Italian Regulations, which are probably the most modern and advanced on this matter.El autor expone en este trabajo, en forma breve y llamativa, las bases en que conviene apoyarse para poder resolver racionalmente el problema de la seguridad de las estructuras de acero frente al fuego. Su lectura hace comprender claramente que no puede constituir esta base el temor irreflexivo, con sus secuelas de revestimientos y precauciones onerosos, e innecesarios la mayor parte de las veces, sino la ponderación prudente de los riesgos posibles, de los medios disponibles para combatir el peligro y de los daños probables que del incendio se puedan derivar. Termina el artículo con un rápido comentario del nuevo Reglamento italiano, probablemente el más moderno y avanzado de todos los existentes sobre esta materia de protección contra el fuego.

  20. Localización de hipocentros y determinación de su magnitud en Tierra del Fuego y zonas aledañas

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    Carolina Buffoni

    2009-12-01

    Full Text Available Nuevos hipocentros de sismos de baja a mediana magnitud han sido calculados con el fin de estudiar la sismicidad en la Isla de Tierra del Fuego y zonas aledañas. La región presenta un complejo escenario tectónico: la isla es atravesada por una falla transformante conocida como Falla de Magallanes-Fagnano la cual divide a Tierra del Fuego en dos bloques continentales. Esta falla constituye el mayor segmento continental del borde de las placas de Scotia y Sudamericana. La isla tiene una importante historia sismológica que incluye un evento de carácter destructivo ocurrido en diciembre de 1949 el cual alcanzó una magnitud de 7.8 en la escala de Richter. De un análisis de sismicidad histórica, se conocen reportes de sismos en los años 1929, 1930, 1944, 1949 y 1970. En el presente trabajo se ha realizado la localización de los hipocentros y el análisis de los errores en la determinación. A tal efecto se analizaron los registros de 5 estaciones sismológicas para el período enero 2007 - diciembre 2007. Más de 180 sismos fueron localizados y algunos de ellos comparados con los cinco eventos registrados por el NEIC (National Earthquake Information Center y el ISC (Internacional Seismological Centre para el mismo período. El cálculo de magnitud fue realizado a partir de la amplitud del primer arribo. La mayoría de los sismos tienen un valor de magnitud mb que se concentra entre 2 y 4 grados. Con respecto a la profundidad hipocentral, más del 50% de los eventos localizados tienen profundidades en los primeros 10 km. El mapa de sismicidad obtenido muestra una distribución de sismos sobre y en las cercanías de la falla Magallanes-Fagnano, una concentración de epicentros en el área de la Cordillera de Darwin y en los alrededores de la placa de Scotia, manifestando indicios de una correlación con el ambiente geotectónico del área de estudio.New hypocentre locations of earthquakes with low to medium magnitude have been calculated in

  1. Homicidios diarios. Análisis del discurso periodístico sobre homicidios por armas de fuego. Buenos Aires (Argentina 2001-2002

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    Leonardo Federico

    2010-01-01

    Full Text Available Durante los años 2001 y 2002, la Argentina atravesó una grave crisis política y social, alcanzando niveles de pobreza y exclusión inauditos. En esos años, los diferentes tipos de violencia urbana mostraron un marcado incremento, en especial los homicidios cometidos mediante el uso de armas de fuego, constituyéndose en una problemática social con importantes repercusiones para la salud pública. El presente artículo es producto de una investigación cualitativa que indagó, mediante un análisis crítico del discurso, las diferentes modalidades con que los diarios La Nación y Clarín dieron cuenta de los hechos acaecidos -durante dicho período- en la Ciudad Autónoma de Buenos Aires. Los datos se obtuvieron de la recopilación de material de hemeroteca, y fueron analizados a partir de una técnica propia referenciada en la Escuela Francesa de Análisis del Discurso. En cuanto a los resultados del estudio, se subraya: el posicionamiento más popular adoptado por el diario Clarín (lógica enunciativa de la verosimilitud, en contraposicióncon la búsqueda de objetividad de La Nación (lógica de la verificación, asumiendo ambos un carácter complementario en la producción y reproducción social de sentido, al dar cuenta de las muertes por homicidios ocasionadas mediante el uso de armas de fuego.

  2. EFECTO DE LA SEVERIDAD DEL FUEGO EN LAS CARACTERÍSTICAS DE LA ESTRUCTURA FORESTAL EN RODALES DE CONÍFERAS

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    Diana Y. Ávila-Flores

    2014-01-01

    Full Text Available El objetivo del presente trabajo fue realizar un análisis exploratorio de la distribución espacial del arbolado en rodales mixtos de coníferas de la Sierra Madre Oriental, afectados por un incendio en el verano de 1998, con el fin de conocer el grado en que la severidad de un incendio modifica las características estructurales de los mismos. El área seleccionada comprendió tres rodales mixtos de coníferas con tres grados de severidad de incendio (bajo, medio y alto. Los patrones de distribución espacial del arbolado se analizaron a través de la función K de Ripley. Asimismo, se analizó la interacción espacial de los árboles en relación con sus dimensiones y especies mediante una función de correlación de marca kmm(r. Se observó que conforme la severidad del incendio aumenta, la distribución espacial del arbolado tiende a la agregación y a la formación de rodales dimensionalmente heterogéneos, mientras que la composición de especies no fue afectada. El fuego influyó en estos bos- ques como un promotor de la diversidad dimensional, a pesar de que la mezcla espacial de especies tuvo una tendencia a la homogeneidad.

  3. SHRIMP chronology of the Magallanes Basin basement, Tierra del Fuego: Cambrian plutonism and Permian high-grade metamorphism Geocronología SHRIMP del basamento de la Cuenca de Magallanes, Tierra del Fuego: plutonismo Cámbrico y metamorfismo Pérmico de alto grado

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    Francisco Hervé

    2010-07-01

    Full Text Available Five new SHRTMP U-Pb zircon ages are reported for gneisses and foliated plutonic rocks belonging to the Tierra del Fuego igneous and metamorphic basement complex (TFIMC, obtained from the bottom of borehole cores through the Magallanes Basin. Three of the samples yielded weighted mean 206Pb/238U ages (523±7 Ma, 522±6 Ma and 538±6 Ma, interpreted as indicating Early Cambrian igneous crystallization of the host rocks. A migmatitic gneiss shows peaks at ca. 950-1,100 Ma and 560-650 Ma from inherited zircon grains in addition to two grains with ages of ca. 525 Ma, suggesting involvement of Grenvillian and Brasiliano material in the protolith of a Cambrian migmatite. A cordierite-sillimanite-garnet gneiss contains igneous zircons of Cambrian age and a population of U-rich metamorphic Permian zircons, indicating that a Permian high-grade metamorphic and anatectic (P=2-3 kbar, T=730-770°C event affected the Cambrian igneous rocks or sedimentary rocks derived from them. Cambrian/Ediacaran plutonic rocks are known from the basement of NW Argentina, the Sierra de la Ventana, the Cape Fold Belt in South Africa, and the Ross Orogen in Antarctica. The Permian metamorphic event is coeval with the deformation and low-grade metamorphism of the sedimentary successions that overlie the basement in many of these areas. In Tierra del Fuego at least 8 to 12 km of cover rocks were removed following the high-grade Permian metamorphic episode and the unconformable deposition of the Tobífera Formation volcanic rocks in the Middle to Late Jurassic. This eroded cover could nave been an important source of detritus for the conglomeratic Permian and Triassic? Successions of neighboring regions in South America, Africa and Antarctica.Cinco nuevas edades radiométricas logradas mediante análisis U-Pb en circón utilizando el SHRIMP, fueron determinadas en gneises y rocas plutónicas foliadas obtenidas desde el fondo de pozos de sondajes en la Cuenca de Magallanes y

  4. Effect of wildfire on soil physical and chemical properties in a Nothofagus glauca forest, Chile Efecto del fuego en las propiedades físicas y químicas en un bosque de Nothofagus glauca en Chile

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    CREIGHTON M. LITTON

    2003-12-01

    following fire (e.g., a reduction in organic matter content of the soil, decreased soil moisture, and increased soil pH. The results of this study have implications for the productivity and sustainable management of the native forest remnants that remain in this regionSe investigó el efecto de un incendio forestal sobre las propiedades físicas y químicas de un bosque de Nothofagus glauca (Phil. Krasser en la zona costera de la zona centro sur de Chile. Durante los dos primeros años después de ocurrido el incendio, se comparó la respuesta de ese suelo con otro de las mismas características, pero por donde no pasó el fuego, ubicado en forma adyacente. A pesar de que el efecto del fuego en las propiedades del suelo en este ecosistema altamente fragmentado son poco conocidas, ellas son comparables a otros ecosistemas forestales de zonas mediterráneas. Se examinaron tanto las propiedades físicas (densidad aparente, porcentaje de humedad y contenido de materia orgánica como las químicas (nitrógeno inorgánico intercambiable, fósforo extraíble, potasio intercambiable y pH del suelo. La información recogida sugiere que las propiedades del suelo en el ecosistema varían en su respuesta inicial. El contenido de materia orgánica y la humedad del suelo decrecen después del incendio y se mantienen en valores menores que en el sector no quemado, al menos en el tiempo de duración de este estudio. El potasio intercambiable inicialmente se incrementa después del incendio, pero luego decrecen con el tiempo y al final de dos años los valores son significativamente menores que en el sector no quemado. En cambio, tanto el fósforo intercambiable como el pH del suelo se incrementan inmediatamente después del incendio y permanecen en valores significativamente más altos que en el sector no quemado durante todo el tiempo de duración del estudio. El nitrógeno inorgánico intercambiable alcanza niveles más altos en el sector quemado en las mediciones de otoño (abril de

  5. Las imágenes inducidas de Tierra del Fuego (Argentina. Cambios y permanencias en el contenido de la promoción turística oficial (1990-2012

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    Patricia Andrea Mosti

    2016-01-01

    Full Text Available La imagen turística es una construcción mental y social que guarda relación con los atributos tangibles e intangibles del destino. La promoción turística contribuye a conformar la imagen del destino atendiendo a los imaginarios de los posibles consumidores y a los atributos del territorio que se deciden poner en valor y promocionar. El objetivo general de esta investigación es indagar sobre las continuidades y los cambios en el contenido del discurso promocional oficial de Tierra del Fuego y su vinculación con el imaginario de la región austral. Se analizó el contenido visual y textual del discurso promocional que se difunde en los folletos turísticos elaborados desde la década del 90’ hasta el presente.

  6. Primer registro de Dasypsyllus (Avesopsylla lasius lasius (Siphonaptera: Ceratophyllidae en nidos de golondrina chilena, Tachycineta meyeni (Passeriformes: Hirundinidae, en Ushuaia (Tierra del Fuego, Argentina

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    Rosana ARAMBURÚ

    2009-01-01

    Full Text Available La golondrina chilena, Tachycineta meyeni (Cabanis, nidifica en el centro de Chile y suroeste de Argentina. En invierno migra a Bolivia, Paraguay y al sureste de Brasil. Estas golondrinas ocuparon una serie de cajas-nido en Ushuaia, Tierra del Fuego. Luego de la temporada de cría, tratamos los nidos con acetato de etilo y los revisamos en búsqueda de artrópodos hematófagos. Encontramos pulgas adultas, que fueron fijadas, aclaradas, deshidratadas, diafanizadas y montadas en un derivado de clavo de olor para su observación al microsocopio óptico. Identificamos machos y hembras de Dasypsyllus (Avesopsylla lasius lasius (Rothschild. En Argentina, esta pulga es conocida solamente en Sierra de la Ventana (Buenos Aires, donde se la halló parasitando la golondrina barranquera, Notiochelidon cyanoleuca patagonica (Vieillot. La información disponible debería complementarse con prospecciones en localidades intermedias. Otras aves relacionadas con ambas golondrinas por la ocupación de nidos, como el rayadito (Aphrastura spinicauda (Gmelin, ratona común (Troglodytes aedon Vieillot, caminera común (Geositta cunicularia (Vieillot, hornero (Furnarius rufus (Gmelin, podrían contribuir a la dispersión de la pulga entre las dos localidades registradas.

  7. Species richness and faunistic affinities of the Gammaridea and Corophiidea (Amphipoda from shallow waters of southern Tierra del Fuego, Argentina: preliminary results

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    Ignacio Luis Chiesa

    2005-12-01

    Full Text Available Species richness and faunistic affinities of gammaridean and corophiidean amphipods from southern Tierra del Fuego were studied. The material was collected with dredges and grabs at 7 locations (15 sampling stations in a range of 5 to 35 m depth. A total of 61 species belonging to 20 families and 43 genera were identified. The genera Cephalophoxoides, Ceradocopsis and Photis are reported for the first time from the Magellan region and 3 species belonging to Atylus, Ischyrocerus and Photis appear to be new to science. Most of the species collected belong to Phoxocephalidae, whereas most individuals were contained in the Stenothoidae and Lysianassidae s.l. The analysis of the faunistic affinities showed that 16 species (39% are endemic to the Magellan region, 9 species (22% extend to the south, 5 species (12.2% to the north and 5 other species (12.2% to both the north and south. In addition, 6 species extend beyond the Magellan region as far as Oceania.

  8. Del compromiso ético a la manipulación. Las fotografías de un reportero de guerra en bajo el fuego (R. Spottiswoode, 1983

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    Elvira Loma Muro

    2011-04-01

    Full Text Available Es muy frecuente la presencia de la fotografía como elemento discursivo en el cine, de modo particular en las películas de tema bélico. La fotografía es una imagen de la realidad y, en el caso de la foto-documento (como por ejemplo la fotografía de guerra, pretende ser un reflejo veraz de la misma. Pero, por muchas razones, la objetividad de la fotografía puede verse alterada al permitir la técnica que su autor la manipule o al utilizarse con una finalidad distinta de para la que fue concebida. Sobre esa manipulación, sobre sus justificantes morales o sobre los intereses que la provocan se centran nuestras reflexiones. Estas se articulan a partir del filme Bajo el fuego (Roger Spottiswoode, 1983 que presenta la actuación de un reportero de guerra en el conflicto nicaragüense de 1979. Los tipos de instantáneas que realiza, sus intenciones y la ética de su comportamiento ofrecen muchos matices para el análisis.

  9. Herida penetrante del tórax por un proyectil de arma de fuego localizado inicialmente en el ventrículo izquierdo y luego en la arteria renal derecha

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    Cosío Lima, Ludmila; Gámiz González, Raúl; Cosío Pascal, Miguel

    2017-01-01

    Resumen: Objetivo: Presentar un caso de herida penetrante del corazón con migración del proyectil y comentar los criterios actuales para el manejo de este tipo de pacientes. Las heridas por proyectil de arma de fuego penetrantes a tórax cada día son más frecuentes en todo el mundo y traen aparejada una mortalidad considerable, ya que el calibre y el poder de las armas también son actualmente más letales. Los heridos que logran llegar vivos al hospital están generalmente supeditados a la atenc...

  10. Análisis del efecto del fuego y de la presencia de contaminantes sobre la actividad y biodiversidad microbiana del suelo

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    Turmero Hidalgo, Adriana Isabel

    2013-01-01

    La salud de un suelo se puede definir como la capacidad del mismo para funcionar como un sistema vivo dentro de un ecosistema, sustentar la productividad biológica, promover la calidad ambiental y mantener la salud de plantas, animales y del hombre. El concepto de salud del suelo se relaciona, por tanto, con las características biológicas, químicas y físicas del mismo, que son esenciales para una productividad agrícola sostenible a largo plazo, con un mínimo impacto ambiental. El estudio del...

  11. Análisis de nuevos estándares para reducir datos de gravedad: aplicación en Tierra del Fuego

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    Ana Carolina Pedraza De Marchi

    2011-12-01

    Full Text Available El objetivo principal de este trabajo consistió en investigar el uso de nuevos estándares y procedimientos para reducir datos de gravedad con el fin de mejorar la precisión, exactitud y utilidad geofísica de las anomalías de gravedad. Los nuevos estándares tienen en cuenta el mayor poder computacional actual, la moderna tecnología de posicionamiento satelital para determinar la altura y el posicionamiento de las estaciones gravimétricas, las mejoras en las bases de datos topográficos/batimétricos y nuevos algoritmos matemáticos. Están basados en procedimientos, protocolos, ecuaciones y parámetros internacionalmente aceptados y que en muchos casos difieren de los presentados en los actuales libros de textos y bases de datos gravimétricos existentes. El cambio más importante que sugieren los nuevos estándares es el uso del elipsoide de referencia terrestre internacionalmente adoptado para definir el datum vertical o superficie de referencia para las alturas (Hinze et al., 2005, debido al creciente uso del Sistema Global de Posicionamiento (GPS para realizar trabajos de campo gravimétricos. Las anomalías calculadas con los nuevos estándares podrían ser modificadas por el adjetivo "elipsoidal" (Hinze et al., 2005 para diferenciarlas de las anomalías que se calculan mediante las elevaciones convencionales referidas al geoide. Se usó la información existente en la provincia de Tierra del Fuego para hacer reducciones, siguiendo los procedimientos tradicionales y las nuevas recomendaciones y estándares. Se utilizaron los modelos digitales de terreno y modelos geopotenciales a fin de evaluar la eficacia de su uso en las reducciones gravimétricas. Se integró la información gravimétrica terrestre con anomalías de aire libre derivadas de la altimetría satelital en el mar, en un mapa combinado de anomalías isostáticas elipsoidales.The main objective of this study was to investigate the use of new standards and procedures for

  12. On the presence of upper paleocene rocks in the foreland succession at Cabo Nariz, Tierra del Fuego, Chile: Geology and new palynological and U-Pb data

    International Nuclear Information System (INIS)

    Sanchez, Alejandro; Pavlishina, Polina; Godoy, Estanislao; Herve, Francisco; Fanning, C.Mark

    2010-01-01

    On the west coast of Tierra del Fuego, south of Cabo Nariz, in Chile, Upper Cretaceous to Paleocene sedimentary successions of the Magallanes foreland basin crop out. The presence of dinoflagellate cysts, as well as radiometric U-Pb SHPJMP dating of detrital zircons, indicate that this succession ranges from the Campanian to Thanetian (Late Paleocene) in age. The base of the exposed sedimentary succession comprises siltstones of external platform facies (Cerro Cuchilla Formation), which are thrust over the Cabo Nariz Beds. The latter fonnation is divided into two members: a lower siltstone-dominated turbidite facies member and an upper member of sandstone-dominated turbidites, with sandstone and conglomerate channel facies. The presence of dinocysts in the Cerro Cuchilla Formation suggests a late Campanian to early Danian age. The fossil content in the Cabo Nariz Beds indicate a Selandian (Middle Paleocene) depositional age in accordance with the detrital zircon ages which provide a maximum possible Campanian age (76.5±0.7 Ma), and very close to the Thanetian (Late Paleocene) (57.6±1 Ma) depositional ages for the lower and upper member, respectively. The sedimentary succession of Cabo Nariz Beds, is interpreted as a north-northwest prograding submarine fan of middle to Late Paleocene age. It is considered to represent the deposition of detritus derived from an uplifting orogen located to the south. The detrital zircon age spectra suggest that there was a period of low intensity of magmatic activity in the source area around the K-T boundary

  13. Un nuevo mamífero introducido en la Tierra del Fuego: el "peludo" Chaetophractus villosus (Mammalia, Dasypodidae en Isla Grande A new introduced mammal in Tierra del Fuego: the "large hairy armadillo" Chaetophractus villosus (Mammalia, Dasypodidae in the Isla Grande island

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    SEBASTIÁN POLJAK

    2007-09-01

    Full Text Available El 66 % de la mastofauna de la Tierra del Fuego está compuesta por especies introducidas deliberadamente por cuestiones de índole económica, estética y caza deportiva. Entre ellas, el armadillo Chaetophractus villosus conocido vulgarmente como "peludo", que habita desde el Chaco de Bolivia y Paraguay hasta el sur de la provincia de Santa Cruz en Argentina, ha sido introducida en la Isla Grande de Tierra del Fuego hace unos 20 años. Las cuevas y hoyos son las evidencias indirectas más conspicuas de la actividad de esta especie y son utilizados en este trabajo para determinar la distribución y estimar la abundancia relativa de la población de armadillos en el sector argentino de la Isla Grande. Se clasificó a las cuevas en "cortas" para refugio temporario y/o forrajeo y "largas", de uso como madriguera o semipermanente. Chaetophractus villosus es una especie establecida en la isla donde ocupa un área de unos 484 km² y su distribución se encuentra asociada a la red de tuberías soterradas para extracción y transporte de hidrocarburos, debido a las modificaciones físicas que esta actividad causa en el suelo. Aunque la población es aún pequeña, se considera que dada la distribución alcanzada por C. villosus a partir de la introducción de pocos individuos y teniendo en cuenta las condiciones climáticas de la región, es posible que no sea el clima un factor determinante en la distribución de esta especie sino las barreras geográficas como el Estrecho de Magallanes al sur y el Río de La Plata hacia el esteSixty-six percent of the mammal fauna of Tierra del Fuego consists of introduced species with economical or sport hunting importance. The large hairy armadillo, Chaetophractus villosus, is distributed from the Chaco of Bolivia and Paraguay to the South of Santa Cruz province in Argentina and was introduced to Isla Grande about 20 years ago. Since the holes and subterranean excavations are the most conspicuous indications of

  14. Aspectos macroscópicos del hueso sometido al fuego. Revisión de las cremaciones descritas en el País Vasco desde la Arqueología.

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    Francisco Etxeberria

    1994-01-01

    Full Text Available Tras haber revisado la mayoría de las colecciones arqueológicas con restos humanos afectados por el fuego, se reinterpreta el fenómeno del ritual funerario valorando tambien otras posibilidades que deben ser tenidas en consideración. Con base en algunas experiencias propias realizadas, se describen los aspectos macroscópicos que presenta el hueso tras haber sido sometido a altas temperaturas constatando el diferente comportamiento entre el tejido fresco y el seco o antiguo.

  15. Primer registro de Dasypsyllus (Avesopsylla lasius lasius (Siphonaptera: Ceratophyllidae en nidos de golondrina chilena, Tachycineta meyeni (Passeriformes: Hirundinidae, en Ushuaia (Tierra del Fuego, Argentina First record of Dasypsyllus (Avesopsylla lasius lasius (Siphonaptera: Ceratophyllidae in Chilean swallow nests Tachycineta meyeni (Passeriformes: Hirundinidae in Ushuaia (Tierra del Fuego, Argentina

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    Rosana Aramburú

    2009-12-01

    Full Text Available La golondrina chilena, Tachycineta meyeni (Cabanis, nidifica en el centro de Chile y suroeste de Argentina. En invierno migra a Bolivia, Paraguay y al sureste de Brasil. Estas golondrinas ocuparon una serie de cajas-nido en Ushuaia, Tierra del Fuego. Luego de la temporada de cría, tratamos los nidos con acetato de etilo y los revisamos en búsqueda de artrópodos hematófagos. Encontramos pulgas adultas, que fueron fijadas, aclaradas, deshidratadas, diafanizadas y montadas en un derivado de clavo de olor para su observación al microsocopio óptico. Identificamos machos y hembras de Dasypsyllus (Avesopsylla lasius lasius (Rothschild. En Argentina, esta pulga es conocida solamente en Sierra de la Ventana (Buenos Aires, donde se la halló parasitando la golondrina barranquera, Notiochelidon cyanoleuca patagonica (Vieillot. La información disponible debería complementarse con prospecciones en localidades intermedias. Otras aves relacionadas con ambas golondrinas por la ocupación de nidos, como el rayadito (Aphrastura spinicauda (Gmelin, ratona común (Troglodytes aedon Vieillot, caminera común (Geositta cunicularia (Vieillot, hornero (Furnarius rufus (Gmelin, podrían contribuir a la dispersión de la pulga entre las dos localidades registradas.Chilean swallows Tachycineta meyeni (Cabanis nest in the central area in Chile and Southwest in Argentina. In winter, they migrate to Bolivia, Paraguay and Southeast of Brazil. A nest box population of Chilean swallows was established in Ushuaia, Tierra del Fuego. After the breeding season, we collected all nests, treated them with ethyl acetate, and inspected all the nest material for hematophagous arthropods. We found adult fleas, which were fixed, cleared, diaphanized, dehydrated, and mounted in a clove derivative for observation under a microscope. We identified males and females of Dasypsyllus (Avesopsylla lasius lasius (Rothschild. In Argentina, this flea is only known for Sierra de la Ventana

  16. Efecto del fuego y dinámica de las hidrófitas emergentes en el humedal de la Mintzita, Michoacán, México Fire and dynamics of the emergent hydrophytes of the Mintzita wetlands, Michoacán, México

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    Yazmín Escutia-Lara

    2009-12-01

    Full Text Available El estudio de la dinámica de humedales de aguas interiores de México, en particular del estado de Michoacán, ha sido muy limitado. Por lo tanto, en el año 2005 se inició un estudio de campo a través de parcelas permanentes para conocer la abundancia y distribución, a lo largo del tiempo, de las hidrófitas emergentes de los humedales de la Mintzita, en las cercanías de la ciudad de Morelia. A un año de iniciarse el trabajo (2006, la zona sufrió los efectos de un incendio que se propagó desde un terreno agrícola, disturbio que se repitió durante el tercer año del estudio (2007. Estos incendios permitieron documentar los efectos del fuego sobre la comunidad de hidrófitas emergentes en este sistema de humedales. Los efectos del fuego fueron diferenciales para las especies dominantes; Shoenoplectus americanus no fue afectada por el fuego, pero Typha domingensis redujo y modificó su cobertura a lo largo del gradiente hídrico, lo que ocasionó una pérdida de la zonación inicial característica de estas 2 especies. Durante el año 2005 se identificaron 34 especies; el siguiente año se perdieron 5, y finalmente en 2007 sólo se registraron 26. Entre las especies que se conservan, destaca Carex comosa, perteneciente a un género característico de humedales bien conservados, que aumentó su cobertura 133%. Los incendios afectaron de manera más intensa a especies facultativas y pastos, lo que sugiere que disturbios semejantes pueden mantener la estructura y composición florística de este tipo de ecosistemas.Study of the dynamics of continental wetlands in México, and in particular from the state of Michoacán, has been scarce. In response to this need, a field study was started in 2005 through the establishment of permanent plots to document changes in abundance and distribution through time of emergent hydrophytes of the Mintzita wetlands, near the city of Morelia. In the first and third years , the area suffered the effects of a

  17. Cambios en los usos y cubiertas del suelo y los efectos en la vulnerabilidad en las comarcas de montaña de Cataluña. Del rol del fuego como herramienta de gestión a los incendios como amenaza

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    Badia, A.

    2014-12-01

    Full Text Available Fire is one of the oldest and most efficient tools for managing land use in the Pyrenees and has contributed to shaping a landscape of great cultural and ecological diversity. Human actions affecting land cover have introduced certain changes that affect the role and our perception of forest fires, converting them from one of the normal processes of nature into a serious threat to ecosystems and to society. This study addresses the question: what specific changes in the Pyrenees have led to the current perception of forest fire as a risk or threat? Using GIS and statistical analysis, we conducted a quantitative assessment of land cover changes and we reviewed the forest fires that have occurred in the counties (comarques of the Catalan Pyrenees between 1993-2007, in terms of seasonality and some characteristics of the territory as altitude, slope and orientation. The results shows that: a land cover change tend to forestry and a more homogeneous landscape; b most surface burned occurred in bush and clear forest, what is a sign of the trend of forest transition; c there is a concentration of fires in winter ahead of summer and are located in accessible areas.En los Pirineos el fuego ha sido una de las herramientas más antiguas y eficientes de la historia de la gestión de los usos del suelo y ha contribuido a dar forma a un paisaje de una gran diversidad. La acción humana sobre la cubierta del suelo ha introducido algunas modificaciones, de forma que los incendios forestales han dejado de ser un proceso más del sistema natural para convertirse en una grave amenaza para los ecosistemas y para la sociedad. Utilizando técnicas SIG y análisis estadístico se cuantifican los cambios en las cubiertas del suelo y se hace una diagnosis de los puntos de ignición ocurridos en las comarcas de montaña del Pirineo catalán durante el periodo 1993- 2007, en función de la estacionalidad y algunas características del territorio como la altitud, la

  18. EL EFECTO DEL FUEGO EN LA RIQUEZA DE ESPECIES DE HONGOS MICORRIZÓGENOS ARBUSCULARES ASOCIADA A PLANTAS DE MATORRAL XERÓFILO EN EL PARQUE ECOLÓGICO “CUBITOS"

    Directory of Open Access Journals (Sweden)

    Eduardo Chimal-Sánchez

    2015-01-01

    Full Text Available Los hongos micorrizógenos arbusculares (HMA son esenciales para el funcionamiento de los ecosistemas, entre ellos, los áridos y semiáridos. Esta investigación evaluó el efecto del fuego sobre la riqueza de especies de HMA asociada a Cylindropuntia imbricata , Mimosa biuncifera y Zaluziana augusta . En el Parque Ecológico “Cubitos” de Pachuca, Hidalgo, se seleccionaron dos matorrales xerófilos: i conservado y ii perturbado por un incendio forestal. En cada matorral y de tres individuos de C. imbricata , M. biuncifera , Z. augusta y en áreas abiertas (AA libres de plantas, se recolectaron muestras de suelo (1 kg para la extracción de esporas y determinar la riqueza taxonómica de HMA por género y especie, así como la humedad y pH del suelo. Con un análisis de varianza, similitud y correspondencia se analizaron estas variables. La riqueza de HMA consistió de once morfo-especies distribuidas en seis familias. M. biuncifera en el sitio conservado presentó la mayor riqueza de HMA a nivel de género (6 y especie (6 y en el sitio perturbado fue C. imbricata con cuatro géneros y seis especies. El fuego redujo la riqueza de especies de HMA en un 50, 25 y 50% en M. biuncifera , Z. augusta y en las AA, respectivamente; mientras que, en C. imbricata se incrementó en un 34 %. La familia Gigasporaceae sólo estuvo asociada a M. biuncifera y Z. augusta en la condición conservada. El análisis de correspondencia sugiere que la identidad de la especie vegetal afecta la composición de especies de HMA.

  19. Condiciones de inicio y propagación de los fuegos de copa en masas de pinares

    OpenAIRE

    Fernández Alonso, José María

    2015-01-01

    La tesis aborda una problemática de especial interés científico-tecnológico relativa a los incendios forestales. Actualmente existe una escasez de información aplicable y fiable sobre el comportamiento del fuego de copa y el estado de desarrollo de los modelos predictivos de comportamiento del fuego es todavía incipiente. El proyecto plantea cuatro objetivos en relación al fuego de copa: (a) Cuantificación de los complejos de combustibles, característicos de pinares de Pinus pinaster, como...

  20. El efecto del fuego y las características topográficas sobre la vegetación y las propiedades del suelo en la zona de transición entre bosques y pastizales de las sierras de Córdoba, Argentina

    OpenAIRE

    Giorgis, Melisa Adriana; Cingolani, Ana María; Cabido, Marcelo Ruben

    2016-01-01

    En el contexto actual de cambio climático, el estudio de la dinámica de las zonas de transición entre bosques y pastizales tiene un papel fundamental, tanto a nivel científico como en la planificación del manejo de los ecosistemas. En este trabajo evaluamos el efecto combinado del fuego, la exposición de ladera y la posición topográfica sobre la vegetación y los suelos en una zona de transición entre bosques y pastizales en las montañas de Córdoba. Para ello elegimos cuatro áreas con diferent...

  1. Concepto de armas de fuego y balística

    OpenAIRE

    Colmenero Gil del Avalle, Jesús

    2014-01-01

    Se aborda el concepto de balística forense.Así como las ramas fundamentales en que se divide la ciencia balística: interna, externa, de efectos y comparativa o identificativa. El arma de fuego y su clasificación. Se explica en que consiste los troqueles de las armas, el calibre del arma y de la bala.La cartucheria, el estudio de los componentes del cartucho. Nomenclatura de los cartuchos. Finalmente se aborda la balística externa, trayectoria y distancia de un disparo. Universidad de Málag...

  2. Calibración del tiempo equivalente de exposición al fuego según el código técnico de la edificación

    Directory of Open Access Journals (Sweden)

    Arteaga Iriarte, Ángel

    2004-04-01

    Full Text Available Current tendency in regulation is that of adoptingperformance based codes where targets are establishedwithout demanding them to be reached in a certain way. In theapplication of this kind of codes, the designer must prove that,by means of his suggested solution, prearranged protectionlevels are reached or overcome. In the Spanish TechnicalBuilding Code the method of the Equivalent Time of FireExposure is given as a simplified alternative method to theprescriptive tables of minimal time of resistance demanded tothe structure of a building. In this work this method is appliedto different examples of buildings in order to extractconclusions on the suitability of its application.La tendencia existente en la reglamentación actual es la deadoptar normativas de carácter prestacional en las que seestablecen objetivos sin exigir que éstos deban alcanzarse deuna forma determinada. En la aplicación de este tipo dereglamentaciones, el proyectista debe demostrar que,mediante la solución propuesta, se alcanzan o superan losniveles de protección prefijados. En el Código Técnico de laEdificación se ofrece el método del Tiempo equivalente deexposición al fuego como un método simplificado alternativoa las tablas de tiempos mínimos de resistencia exigidos a laestructura de un edificio. En este trabajo se aplica estemétodo a distintos ejemplos de edificios tipo con el fin deextraer conclusiones sobre su aplicabilidad

  3. Trace elements deposition in the Tierra del Fuego region (south Patagonia) by using lichen transplants after the Puyehue-Cordón Caulle (north Patagonia) volcanic eruption in 2011.

    Science.gov (United States)

    Conti, Marcelo Enrique; Jasan, Raquel; Finoia, Maria Grazia; Iavicoli, Ivo; Plá, Rita

    2016-04-01

    Lichen Usnea barbata transplants were tested as a biomonitor of atmospheric deposition in an apparently pristine environment that is Tierra del Fuego region (Patagonia, Argentina). The present survey is connected with the volcanic eruption that started in north Patagonia on June 4, 2011 from the Puyehue-Cordón Caulle volcano, Chile (north Patagonia, at 1700 km of distance of our sampling sites). Lichens were collected in September 2011 (one month of exposure) and September 2012 (1 year of exposure) in 27 sites covering the northern region of the province where trees are not present. The atmospheric deposition of 27 elements by using Neutron Activation Analysis (NAA) was determined in the collected samples. The first aim of the study was to evaluate the influence of the volcanic eruption on the regional atmospheric deposition comparing our results with baseline data we determined in U. barbata in 2006 in the same sites. The second aim was to test possible patterns of bioaccumulation between the two sampling campaigns after the volcanic eruption. With respect to 2006 baseline levels, we found significant higher levels for As, Ba, Co, Cr, Cs, Na, Sb and U in lichens collected after 1 month of exposure (first sampling campaign--2011). Between the two sampling campaigns (2011-2012) after the eruption, lichens reflected the natural contamination by volcanic ashes with significantly higher median levels of Br, Cr, Fe, K, Na, Sc, and Se. Results confirmed the very good aptitude of U. barbata to reflect the levels of elements in the environment at global scale and to reflect the volcanic emissions at distant places. Volcanic eruptions cause the emission in the atmosphere of elevated levels of particulate matter. In this regard, our findings demonstrate the importance to evaluate the metal composition of the particles to avoid possible health effects.

  4. Respuesta de la madera ante el fuego en la construcción

    Directory of Open Access Journals (Sweden)

    Elvira Martín, Luis Miguel

    1984-03-01

    Full Text Available Not available.El presente artículo pretende dar una amplia visión del material madera y de los elementos que la utilizan como materia prima (tableros, puertas, etc., cuando se encuentran sometidos a la acción del fuego. Se hace un análisis partiendo de la base de realización de ensayos a partir de la Normativa española al respecto, considerando las especies más frecuentemente empleadas en nuestro país, y abarcando los aspectos de duración cortafuegos, estabilidad mecánica sin deformación y estanquidad a las llamas, sin olvidar la emisión de gases inflamables y clasificación frente al fuego. A través de la experiencia que el Laboratorio del Fuego del INIA posee, y que se exponen en esta colaboración, se pueden extraer consecuencias que permitan la utilización de la madera en construcción de una forma más lógica, eliminando algunos prejuicios que existen sobre su naturaleza y comportamiento frente al fuego.

  5. Definiciones y clasificaciones de armas de fuego

    OpenAIRE

    Ávila, Marianela; Proaño, Fernanda; Gómez, Andrés

    2011-01-01

    El siguiente comparativo realiza contrastes entre definiciones y clasificaciones de las armas de fuego, entre el comercio legal e ilegal, entre los países productores, exportadores e importadores, entre las tasas de homicidio por armas de fuego en los países de América Latina y entre los países en cuanto a su legislación sobre control y tenencia de armas, violencia armada y homicidios.

  6. Mineralogical, IR-spectral and geochemical monitoring of hydrothermal alteration in a deformed and metamorphosed Jurassic VMS deposit at Arroyo Rojo, Tierra del Fuego, Argentina

    Science.gov (United States)

    Biel, C.; Subías, I.; Acevedo, R. D.; Yusta, I.; Velasco, F.

    2012-04-01

    The Arroyo Rojo Zn-Pb-Cu volcanogenic massive sulfide deposit is the main deposit of the Fin del Mundo District in the Fuegian Andes, Argentina. This deposit is hosted by a Middle Jurassic volcanic and volcanoclastic sequence forming the Lemaire Formation. The latter consists, from the base up, of the following: rhyolitic and dacitic porphyritic rocks, ignimbrite, tuff, and flow. It is underlain by a pre-Jurassic basement and overlain by the hyaloclastic andesites of the Yahgán Formation. The Arroyo Rojo consists of stacked lenticular lenses that are associated with disseminated mineralization in both the footwall and the hanging wall. The internal structure of the ore lenses is marked by the occurrence of massive, semi-massive and banded facies, along with stringer and brecciated zones and minor ore disseminations. The mineral assemblage comprises mainly pyrite and sphalerite, with minor amounts of galena and chalcopyrite and rare pyrrhotite, arsenopyrite, tetrahedrite and bournonite. The ores and the volcanic host rocks have metamorphosed to greenschist facies and were overprinted by a penetrative tectonic foliation, which led to the development of mylonitic, and cataclastic textures, recrystallization and remobilization. Primary depositional characteristics and regional and hydrothermal alteration patterns were preserved despite deformation and metamorphism. Therefore, primary banding was preserved between facies boundaries. In addition, some remnants of magmatic origin are recognizable in preserved phenocrysts and volcaniclastic phenoclasts. Most of the volcanic and volcaniclastic rocks of the host sequence show a rhyolitic to rhyo-dacitic composition. Regional seafloor alteration, characterized by the presence of clinozoisite, Fe-chlorite and titanite, along with quartz and albite, is partially obliterated by hydrothermal alteration. The hydrothermal alteration is stratabound with the following assemblages, which developed from the base to top: (1) Quartz

  7. Los misioneros salesianos y la polémica sobre la extinción de los Selk’nam de Tierra del Fuego

    Directory of Open Access Journals (Sweden)

    María Andrea Nicoletti

    2006-12-01

    Full Text Available El proceso de extinción de los selk’nam generó una polémica dentro de la congregación de los salesianos alrededor de las causas que suscitaron su desaparición. Por medio de la reducción «Nuestra Señora de la Candelaria» llevada a cabo por monseñor Fagnano en 1893, se puso en marcha un plan de evangelización y «civilización» de los selk’nam. Estos aborígenes buscaban refugio en la reducción ante la persecución y asesinato perpetrados por los estancieros fueguinos. Las acechanzas, el contagio de enfermedades a las que los aborígenes no eran inmunes y el impacto cultural que provocó el sistema de reducciones, contribuyeron a su extinción. Los misioneros salesianos, protagonistas del proceso reduccional, analizaron las causas de la extinción poniendo el acento fundamentalmente en las matanzas de los estancieros y la violencia aplicada por las autoridades estatales, aun admitiendo las ocasionadas por el cambio cultural. La siguiente generación de salesianos, desde el estudio de las fuentes y la construcción de su propia historia, desplazó la causa violenta hacia motivos fisiológicos y culturales, con el fin de no poner en tela de juicio el rol que las familias de estancieros Braun Menéndez y Menéndez Behety, colaboradoras con la obra salesiana, tuvieron en este nefasto proceso.

  8. "Los avisadores del fuego": Rosenzweig, Benjamin, Kafka

    OpenAIRE

    Mate, Reyes; Mayorga, Juan

    2000-01-01

    There were thinkers who foretold in their time the signs of the coming catastrophe. They were not prophets but fine analysts. We are referring to Rosenzweig, Benjamin and Kafka. In the "idealism" of the philosophy that comes from Jonia and reaches Jena, Rosenzweig animadverted on the tendency to a totalitarianism that potentially converted it into an "ontology of war". Benjamin brought to light the radical ambiguity within the concept of progress, so fundamental to the illustrated thought. Ba...

  9. El Paleoceno-Mioceno de Península Mitre: antefosa y depocentro de techo de cuña de la cuenca Austral, Tierra del Fuego, Argentina The Paleocene-Miocene of Peninsula Mitre: foredeep and wedge-top of the Austral Basin, Tierra del Fuego, Argentina

    Directory of Open Access Journals (Sweden)

    Pablo J Torres Carbonell

    2009-07-01

    Full Text Available El sistema de cuenca de antepaís Austral-Malvinas adyacente al orógeno Fueguino comprende sedimen-titas marinas expuestas en el norte de Península Mitre, incluyendo 550 m de la antefosa del Paleoceno tardío-Eoceno temprano, y más de 2.900 m de la subcuenca María Luisa, depocentro de techo de cuña ('wedge-top' del Eoceno medio tardío-?Mioceno. La columna se subdivide en las formaciones La Barca (100 m, Paleoceno superior, Punta Noguera (450 m, Eoceno inferior, Leticia (30 m, Eoceno medio superior, Cerro Colorado (935 m, Eoceno medio superior-Eoceno superior, Puesto José (nom. nov., 1.600 m, Oligoceno y Malengüena (nom. nov., 216 m, ?Mioceno. La microfauna de la Formación Malengüena se distingue por el dominio de Globocassidulina cf brocha, y por su peculiar preservación, ambas características no reconocidas previamente en la porción argentina de la cuenca Austral. Se verifican discordancias sintectónicas entre el límite Paleoceno-Eoceno y el Eoceno medio, asociadas a una etapa de orogénesis regional: en el Eoceno más alto-Oligoceno basal, relacionada localmente con el anticlinal Campo del Medio; en el Oligoceno 'medio', asociada al retrocorrimiento Malengüena; y en el Mioceno ?inferior, relacionada con estructuras profundas de la faja corrida y plegada.The orogenic margin of the Austral-Malvinas foreland basin system is formed by a marine succession exposed at northern Península Mitre, composed of 550 m of the late Paleocene-early Eocene foredeep, and more than 2,900 m of the late middle Eocene-?Miocene María Luisa wedge-top sub-basin. The succession is subdivided in the following formations: La Barca (100 m, upper Paleocene, Punta Noguera (450 m, lower Eocene, Leticia (30 m, upper middle Eocene, Cerro Colorado (935 m, upper middle Eocene-upper Eocene, Puesto José (nom. nov, 1,600 m, Oligocene and Malengüena (nom. nov, 216 m, ?Miocene. The foraminiferal content of the Malengüena Formation is distinguished by the dominance

  10. Caracterización del registro bioarqueológico de Bahía Valentín, Tierra del Fuego: una aproximación desde la tafonomía

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    Tessone, Augusto

    2007-01-01

    Full Text Available Las condiciones de hallazgo de los materiales óseos humanos procedentes de bahía Valentín -donde predominan restos en superficie, sin relación anató- mica y con altos grados de perdidas óseas- nos condujo a evaluar en primera instancia la composición e integridad del registro bioarqueológico desde una perspectiva tafonómica. En un trabajo previo se presentaron los resultados alcanzados en el estudio de materiales obtenidos en el marco del proyecto Arqueología de la Margen Suroriental del Archipiélago Fueguino. En esta oportunidad, manteniendo la misma perspectiva de análisis, se incluye la muestra recuperada por el PEOAF entre los años 1984 y 1988. En primer lugar, se establece el número mínimo de individuos, contemplando la representación anatómica, elementos maduros o inmaduros y proximidad espacial. En segundo lugar, con el fin de identificar los procesos postmorten de destrucción y redepositación actuantes, se identificaron y cuantificaron las modificaciones de las superficies óseas del conjunto recuperado: meteorización, pérdida ósea, marcas de roedores, carnívoros y raíces y termoalteración. Finalmente, se discuten las implicaciones de los resultados obtenidos para la caracterización del registro bioarqueológico del área bajo estudio.

  11. The effect of heat and smoke on the emergence of exotic and native seedlings in a Mediterranean fire-free matorral of central Chile Efecto del calor y el humo sobre la emergencia de plántulas exóticas y nativas en un matorral mediterráneo libre de fuego en Chile central

    Directory of Open Access Journals (Sweden)

    JAVIER A FIGUEROA

    2012-03-01

    relacionadas con la historia del fuego in las poblaciones, un tema importante pobremente reconocido en la literatura.

  12. Fuego Volcano eruption (Guatemala, 1974): evidence of a tertiary fragmentation?

    International Nuclear Information System (INIS)

    Brenes-Andre, Jose

    2014-01-01

    Values for mode and dispersion calculated from SFT were analyzed using the SFT (Sequential Fragmentation/Transport) model to Fuego Volcano eruption (Guatemala, 1974). Analysis results have showed that the ideas initially proposed for Irazu, can be applied to Fuego Volcano. Experimental evidence was found corroborating the existence of tertiary fragmentations. (author) [es

  13. Desarrollo de productos de protección pasiva frente al fuego que incorporan subproductos industriales

    OpenAIRE

    Peña Aguado, Sara; Orantes Garcia, Carolina

    2009-01-01

    En caso de producirse un incendio, por los daños que se pueden ocasionar, la protección pasiva es un factor a tener muy en cuenta en el ámbito de la construcción. El conjunto de elementos constructivos en el desarrollo del incendio pueden experimentar una pérdida de rigidez y resistencia provocando el hundimiento de la estructura. Por tanto, el estudio de protección al fuego de las estructuras es elemental para garantizar la mayor seguridad. Uno de los objetivos del proyecto es el es...

  14. Combinación de colgajos locales y libre microvascularizado para reconstrucción del tercio facial inferior tras traumatismo por arma de fuego Combination of local and free microvascularized flaps for reconstruction of the lower third of the face after gunshot injury

    Directory of Open Access Journals (Sweden)

    Laura Villanueva-Alcojol

    2011-12-01

    Full Text Available El traumatismo por arma de fuego en el territorio maxilofacial constituye uno de los mayores retos a los que se enfrenta el cirujano a la hora de la reconstrucción. La diferencia esencial con otro tipo de traumatismos es la severidad de la lesión y la pérdida de tejidos óseos y blandos. Podemos encontrar en la literatura numerosos artículos sobre reconstrucción facial tras extirpación oncológica; sin embargo, hay pocos documentos que discutan la utilización de colgajos locales y libres microvascularizados para reconstrucción de defectos tras traumatismos de alta energía, y los algoritmos terapéuticos para reconstrucción postraumática. En este trabajo se presenta un caso de reconstrucción del tercio inferior facial tras intento de autolisis y se hace una revisión de los principios de tratamiento de este tipo de pacientes.Gunshot wounds to the maxillofacial region are a challenging problem for the surgeon responsible for reconstruction. The essential difference with respect to other injuries is the severity of the lesion and soft and hard tissue loss. Extensive literature exists on facial reconstruction following tumor extirpation, but there are few reports on the use of local flaps and free tissue transfer for the post-traumatic reconstruction of high-energy defects and therapeutic algorithms for post-traumatic reconstruction. The authors report the case of a patient with reconstruction of the lower third of the face after a suicide attempt and review the principles of treatment of these patients.

  15. Collaborative Monitoring and Hazard Mitigation at Fuego Volcano, Guatemala

    Science.gov (United States)

    Lyons, J. J.; Bluth, G. J.; Rose, W. I.; Patrick, M.; Johnson, J. B.; Stix, J.

    2007-05-01

    A portable, digital sensor network has been installed to closely monitor changing activity at Fuego volcano, which takes advantage of an international collaborative effort among Guatemala, U.S. and Canadian universities, and the Peace Corps. The goal of this effort is to improve the understanding shallow internal processes, and consequently to more effectively mitigate volcanic hazards. Fuego volcano has had more than 60 historical eruptions and nearly-continuous activity make it an ideal laboratory to study volcanic processes. Close monitoring is needed to identify base-line activity, and rapidly identify and disseminate changes in the activity which might threaten nearby communities. The sensor network is comprised of a miniature DOAS ultraviolet spectrometer fitted with a system for automated plume scans, a digital video camera, and two seismo-acoustic stations and portable dataloggers. These sensors are on loan from scientists who visited Fuego during short field seasons and donated use of their sensors to a resident Peace Corps Masters International student from Michigan Technological University for extended data collection. The sensor network is based around the local volcano observatory maintained by Instituto National de Sismologia, Vulcanologia, Metrologia e Hidrologia (INSIVUMEH). INSIVUMEH provides local support and historical knowledge of Fuego activity as well as a secure location for storage of scientific equipment, data processing, and charging of the batteries that power the sensors. The complete sensor network came online in mid-February 2007 and here we present preliminary results from concurrent gas, seismic, and acoustic monitoring of activity from Fuego volcano.

  16. Protección contra el Fuego: Investigación y Desarrollo técnico-comercial para fomentar el uso del a madera en la construcción

    OpenAIRE

    Contador, Patricia; Peña, A.

    2013-01-01

    Actualmente el uso masivo de la construcción con madera en Chile se ve ampliamente obstaculizado a causa de la desconfianza que surge por parte del usuario, el que prefiere vivir en casad de material debido al peligro de un incendio que involucra una vivienda de madera. Ello aún cuando nuestro país padece de un déficit habitacional bastante significativo y pese a ser la madera un material de gran versatilidad, resistencia sísmica, calidez, rapidez de construcción, fácil transporte y una buena...

  17. Colonización radical por endófitos fúngicos en Trithrinax campestris (Arecaceae de ecosistemas semiáridos del centro de Argentina Root colonization by fungal endophytes in Trithrinax campestris (Arecaceae from semiarid ecosystems from Central Argentine

    Directory of Open Access Journals (Sweden)

    Mónica A Lugo

    2011-12-01

    Full Text Available En ecosistemas áridos y semiáridos las raíces de las plantas suelen formar simbiosis con hongos, los que les proporcionan nutrientes y agua. Poco se conoce sobre los hongos asociados a palmeras nativas y cómo éstos podrían estar relacionados entre ellos. Se describe y cuantifica la colonización radical de los simbiontes de Trithrinax campestris en poblaciones leve y fuertemente afectadas por el fuego. T. campestris fue colonizada por hongos micorrícico-arbusculares (HMA y endófitos septados oscuros (ESO. La colonización por HMA fue del tipo intermedio entre los tipos Arum y Paris. La colonización por HMA y ESO y la producción de pelos radicales, presentó diferencias entre las poblaciones estudiadas. Los resultados sugieren que en T. campestris la relación entre hongos simbiontes/producción de pelos radicales podrían estar relacionada con su alta tolerancia al fuego y la aridez.In arid and semiarid ecosystems, roots frequently form symbiosis with fungi that provides access to nutrients and water. Knowledge regarding the study of fungal symbionts colonizing native palms roots is still scarce. We described, quantified and compared fungal colonization in roots of Trithrinax campestris from two environmental situations: population with weak-burning-signs and population with strong-burning-signs. T. campestris was colonized by arbuscular-mycorrhizal-fungi (AMF and dark-septate-endophytes (DSE. AMF colonization was an intermediate type between Arum and Paris. The AMF and DSE colonization and root hair production differed between populations. Our results suggest that in T. campestris the relation between fungal-symbionts and root-hair-production might be related to tolerance to burning and aridity.

  18. Glosa paseada bajo el fuego y la lluvia: cinco lentes para mirar el Chocó

    Directory of Open Access Journals (Sweden)

    Mónica María del Valle Idárraga

    2011-12-01

    Full Text Available A partir de la perspectiva general de la ecocrítica o ecopoética, este artículo analiza los modos como se representa la naturaleza y su relación con lo humano en la obra Glosa paseada bajo el fuego y la lluvia (1982 del escritor chocoano Carlos Arturo Caicedo Licona. Las cinco instancias de esa figuración que aquí se estudian ayudan a crear un universo simbólico que respalda una idea de chocoanidad cifrada en prácticas, creencias, recorridos y visiones desde un marco anterior a tecnologías de la identidad como la biodiversidad o la patrimonialización.Based on the general premises of Ecocriticism, this article explores the ways in which nature and its inter-relation to human beings is created in Glosa paseada bajo el fuego y la lluvia, a work by Carlos Arturo Caicedo Licona, a writer from Chocó, Colombia. Five instances of that representation are analyzed as pieces that, while describing practices, conceptions, beliefs and cartographic descriptions, structure an idea of Chocoan identity previous to current identity technologies, such as patrimonialization and biodiversity.

  19. Efectos de las cenizas y la repelencia al agua en suelos afectados por incendios forestales en ecosistemas mediterráneos = Ash and water repellency efects on soil hydrology in fire-afected Mediterranean ecosystems

    OpenAIRE

    Berenguer Bodí, Mercedes

    2012-01-01

    El fuego es un factor ecológico natural en la Tierra y ha actuado con diferente intensidad desde hace 400 millones de años. En condiciones de clima mediterráneo el fuego es un factor recurrente que las sociedades humanas han controlado desde hace milenios. Sin embargo, tras medio siglo de abandono agrícola y ganadero, la gestión del monte mediterráneo mediante el uso del fuego es inexistente. Además, con la recuperación de la vegetación, el fuego afecta ahora a una densa y continua masa fores...

  20. Fuego/Scefire MPMD Coupling L2 Milestone Executive Summary

    Energy Technology Data Exchange (ETDEWEB)

    Pierce, Flint [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Tencer, John [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Pautz, Shawn D. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Drumm, Clifton R. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2017-09-01

    This milestone campaign was focused on coupling Sandia physics codes SIERRA low Mach module Fuego and RAMSES Boltzmann transport code Sceptre(Scefire). Fuego enables simulation of low Mach, turbulent, reacting, particle laden flows on unstructured meshes using CVFEM for abnormal thermal environments throughout SNL and the larger national security community. Sceptre provides simulation for photon, neutron, and charged particle transport on unstructured meshes using Discontinuous Galerkin for radiation effects calculations at SNL and elsewhere. Coupling these ”best of breed” codes enables efficient modeling of thermal/fluid environments with radiation transport, including fires (pool, propellant, composite) as well as those with directed radiant fluxes. We seek to improve the experience of Fuego users who require radiation transport capabilities in two ways. The first is performance. We achieve this through leveraging additional computational resources for Scefire, reducing calculation times while leaving unaffected resources for fluid physics. This approach is new to Fuego, which previously utilized the same resources for both fluid and radiation solutions. The second improvement enables new radiation capabilities, including spectral (banded) radiation, beam boundary sources, and alternate radiation solvers (i.e. Pn). This summary provides an overview of these achievements.

  1. Resolución endovascular de lesiones por arma de fuego en la región cervical

    Directory of Open Access Journals (Sweden)

    Sebastián Rizzone

    2016-01-01

    Full Text Available Introducción: Las heridas producidas por armas de fuego que comprometen la región cervical son materia de controversia en cuanto a cuál es el mejor método para tratarlas. La resolución endovascular de este tipo de patología ha cobrado gran relevancia en los últimos años debido al desarrollo de nuevos dispositivos y, consecuentemente, a la menor incidencia de complicaciones inherentes al procedimiento. Objetivo: Determinar el rol del tratamiento endovascular en la resolución de las lesiones cervicales por arma de fuego. Material y métodos: Se incluyeron 76 pacientes que sufrieron lesiones cervicales por arma de fuego, a los cuales se les realizó angiografía de los vasos supraaórticos para decidir la conducta a seguir. Resultados: Del total de 76 pacientes, 47 (61,8% presentaron una angiografía patológica; de estos, en 26 se decidió la resolución endovascular de la lesión, implantándose 1,1 stents por paciente. La estadía intrahospitalaria fue en promedio de 10,4 días. A los 30 días de seguimiento, 2 pacientes presentaron secuela neurológica y uno evolucionó con sepsis. En el seguimiento alejado con un promedio de 4 años se registró una muerte a los 117 días de realizado el procedimiento. Conclusiones: La intervención endovascular ha ganado mayor protagonismo con el desarrollo de nuevos dispositivos que permiten el tratamiento de patologías cada vez más complejas y reducir el tiempo de internación intrahospitalaria, como también las complicaciones relacionadas con el procedimiento.

  2. Armas de fuego vs armas no letales

    OpenAIRE

    Sepúlveda Jiménez, Juan

    2016-01-01

    Cada vez son más los casos en donde una persona muere durante el forcejeo que mantiene con las Fuerzas y Cuerpos de Seguridad del Estado durante el proceso de detención. Esto supone un gran reto profesional para el médico forense que realiza la autopsia. En muchas ocasiones, los resultados obtenidos tras la autopsia no son entendidos por la sociedad, familiares del fallecido ni correctamente divulgados por los medios de comunicación, pareciendo que dicha muerte queda en un limbo judicial. ...

  3. Dinámica de la humedad de los combustibles y su relación con la ecología y el manejo de fuego en la región chaqueña occidental (Argentina) I: conceptos básicos

    OpenAIRE

    DEFOSSÉ, G.; BIANCHI, L.; DENTONI M.; KUNST, C.; LEDESMA, R.; BRAVO, S.

    2014-01-01

    El fuego es un modelador de la mayoría de los ecosistemas vegetales del mundo, entre ellos, los correspondientes a la región chaqueña argentina donde asimismo ha sido usado ampliamente como una herramienta de manejo de la vegetación. Dada una fuente de ignición, para que un fuego pueda prosperar deben existir ciertas condiciones. Entre ellas, el contenido de humedad del combustible (CH) juega un rol fundamental ya que su magnitud influirá en la probabilidad de ignición, en el posterior compor...

  4. Muerte por proyectil de arma de fuego (PAF): procesamiento de la escena y hallazgos de necropsia. Morgue Central de Lima 2011

    OpenAIRE

    Astuhuamán, Denisse; Aronés, Shérmany; Carrera, Rosa; Tejada, César; Velásquez, Róger

    2013-01-01

    Introducción: La información del levantamiento de cadáver constituye la primera fase de la necropsia requerida para contrastarla con información obtenida, por lo que es primordial su estudio. Objetivos: Revisión del procesamiento de escena y hallazgos de necropsia en casos de muerte por proyectil de arma de fuego (PAF). Diseño: Descriptivo, retrospectivo, transversal. Institución: Instituto de Medicina Legal, Ministerio Público, e Instituto de Patología, UNMSM. Material de estudio: Informes d...

  5. La mortalidad por armas de fuego en Argentina entre 1990 y 2008 Firearm mortality in Argentina, 1990-2008

    Directory of Open Access Journals (Sweden)

    Marina Gabriela Zunino

    2012-04-01

    Full Text Available Este es un estudio epidemiológico descriptivo de la mortalidad por armas de fuego en Argentina, 1990-2008. Se analizaron los porcentajes y las tasas de mortalidad por armas de fuego entre las jurisdicciones del país. Los datos provienen de la Dirección de Estadística e Información en Salud, Ministerio de Salud y Ambiente, República Argentina. Entre 1990-2008 se produjeron 358.484 muertes por causas externas de las cuales el 16,6% (59.339 correspondieron a armas de fuego. La Provincia de Buenos Aires presentó el porcentaje y tasas cruda y ajustada superiores. Las jurisdicciones de la Región Pampeana (incluye Provincia de Buenos Aires presentaron un perfil más homogéneo y similar al del país: aumento de las tasas en 1999-2002 y disminución en 2003-2006. Estos hallazgos se explicarían en parte por el deterioro socioeconómico vivido en Argentina a fines del siglo XX, que habría tenido mayor impacto en Provincia de Buenos Aires, por ser ésta una de las provincias con mayor desarrollo y dinamismo económico de Argentina. La situación de Provincia de Buenos Aires habría estado agravada por el hecho de tener una de las fuerzas policiales más represivas del país.This is a descriptive epidemiological study of firearm mortality in Argentina, 1990-2008. The study compared the firearm mortality percentages and rates between the country's jurisdictions. The data are from the Office of Health Statistics and Information, Ministry of Health. From 1990 to 2008 there were 358,484 deaths from external causes, of which 16.6% (59,339 were caused by firearms. The Province of Buenos Aires showed the highest percentage and crude and adjusted rates. The jurisdictions in the Pampeana region (including the Province of Buenos Aires showed a more homogeneous profile, similar to that of the country as a whole, with an increase in the rates from 1999 to 2002 and a decrease from 2003 to 2006. These findings are partially explained by the country

  6. SIERRA Low Mach Module: Fuego Theory Manual Version 4.44

    Energy Technology Data Exchange (ETDEWEB)

    Sierra Thermal/Fluid Team

    2017-04-01

    The SIERRA Low Mach Module: Fuego along with the SIERRA Participating Media Radiation Module: Syrinx, henceforth referred to as Fuego and Syrinx, respectively, are the key elements of the ASCI fire environment simulation project. The fire environment simulation project is directed at characterizing both open large-scale pool fires and building enclosure fires. Fuego represents the turbulent, buoyantly-driven incompressible flow, heat transfer, mass transfer, combustion, soot, and absorption coefficient model portion of the simulation software. Syrinx represents the participating-media thermal radiation mechanics. This project is an integral part of the SIERRA multi-mechanics software development project. Fuego depends heavily upon the core architecture developments provided by SIERRA for massively parallel computing, solution adaptivity, and mechanics coupling on unstructured grids.

  7. SIERRA Low Mach Module: Fuego Theory Manual Version 4.46.

    Energy Technology Data Exchange (ETDEWEB)

    Sierra Thermal/Fluid Team

    2017-09-01

    The SIERRA Low Mach Module: Fuego along with the SIERRA Participating Media Radiation Module: Syrinx, henceforth referred to as Fuego and Syrinx, respectively, are the key elements of the ASCI fire environment simulation project. The fire environment simulation project is directed at characterizing both open large-scale pool fires and building enclosure fires. Fuego represents the turbulent, buoyantly-driven incompressible flow, heat transfer, mass transfer, combustion, soot, and absorption coefficient model portion of the simulation software. Syrinx represents the participating-media thermal radiation mechanics. This project is an integral part of the SIERRA multi-mechanics software development project. Fuego depends heavily upon the core architecture developments provided by SIERRA for massively parallel computing, solution adaptivity, and mechanics coupling on unstructured grids.

  8. SIERRA Low Mach Module: Fuego User Manual Version 4.44

    Energy Technology Data Exchange (ETDEWEB)

    Sierra Thermal/Fluid Team

    2017-04-01

    The SIERRA Low Mach Module: Fuego along with the SIERRA Participating Media Radiation Module: Syrinx, henceforth referred to as Fuego and Syrinx, respectively, are the key elements of the ASCI fire environment simulation project. The fire environment simulation project is directed at characterizing both open large-scale pool fires and building enclosure fires. Fuego represents the turbulent, buoyantly-driven incompressible flow, heat transfer, mass transfer, combustion, soot, and absorption coefficient model portion of the simulation software. Syrinx represents the participating-media thermal radiation mechanics. This project is an integral part of the SIERRA multi-mechanics software development project. Fuego depends heavily upon the core architecture developments provided by SIERRA for massively parallel computing, solution adaptivity, and mechanics coupling on unstructured grids.

  9. SIERRA Low Mach Module: Fuego User Manual Version 4.46.

    Energy Technology Data Exchange (ETDEWEB)

    Sierra Thermal/Fluid Team

    2017-09-01

    The SIERRA Low Mach Module: Fuego along with the SIERRA Participating Media Radiation Module: Syrinx, henceforth referred to as Fuego and Syrinx, respectively, are the key elements of the ASCI fire environment simulation project. The fire environment simulation project is directed at characterizing both open large-scale pool fires and building enclosure fires. Fuego represents the turbulent, buoyantly-driven incompressible flow, heat transfer, mass transfer, combustion, soot, and absorption coefficient model portion of the simulation software. Syrinx represents the participating-media thermal radiation mechanics. This project is an integral part of the SIERRA multi-mechanics software development project. Fuego depends heavily upon the core architecture developments provided by SIERRA for massively parallel computing, solution adaptivity, and mechanics coupling on unstructured grids.

  10. Dinámica de la humedad de los combustibles y su relación con la ecología y manejo de fuego, region chaqueña occidental (Argentina) II: follaje y residuos de árboles y arbustos

    OpenAIRE

    Kunst, Carlos Roberto Guillermo; Ledesma, Ramona Ofelia; Bravo, S.; Defossé, Guillermo Emilio; Godoy, J.; Navarrete, V.

    2017-01-01

    El fuego es fenómeno frecuente en la región chaqueña argentina. El contenido de agua (CH, %) es un factor que define la inflamabilidad de los combustibles vegetales, y sus cambios en magnitud pueden ser usados para comprender la ecología y régimen del fuego en una región, para planificar su uso como prescripto; o como un indicador de riesgo para su prevención. En este trabajo se evaluó la dinámica de CH a través del tiempo del follaje (combustible vivo), hojarasca y residuos leñosos de distin...

  11. Dinámica de la humedad de los combustibles y su relación con la ecologíay manejo de fuego, region chaqueña occidental (Argentina) II: follaje y residuos de árboles y arbustos

    OpenAIRE

    KUNST,C; LEDESMA, R; BRAVO, S.; DEFOSSÉ, G.; GODOY, J.; NAVARRETE, V.

    2014-01-01

    El fuego es fenómeno frecuente en la región chaqueña argentina. El contenido de agua (CH, %) es un factor que define la inflamabilidad de los combustibles vegetales, y sus cambios en magnitud pueden ser usados para comprender la ecología y régimen del fuego en una región, para planificar su uso como prescripto; o como un indicador de riesgo para su prevención. En este trabajo se evaluó la dinámica de CH a través del tiempo del follaje (combustible vivo), hojarasca y residuos leñosos de distin...

  12. Llamas y rescoldos nacionales: Con la vida hicieron fuego, novela de Jesús Evaristo Casariego (1953 y película de Ana Mariscal (1957

    Directory of Open Access Journals (Sweden)

    Alfonso García, M.ª del Carmen

    2012-12-01

    Full Text Available This paper examines a novel by Jesús Evaristo Casariego entitled Con la vida hicieron fuego, published in 1953, and its adaptation to the cinema by Ana Mariscal in 1957. Starting out from a comparative analysis of the novel and the film highlighting the similarities and the differences between them, this paper explores the meaning of both artistic proposals. As a theoretical framework, it will rely on theories that explore the construction of national identity and its connections with gender issues.Este artículo estudia la novela de Jesús Evaristo Casariego titulada Con la vida hicieron fuego, publicada en 1953, y la adaptación cinematográfica de la obra que Ana Mariscal realizó en 1957. A partir de las similitudes y diferencias que revela el análisis comparativo del texto y el filme, el trabajo busca establecer el sentido de ambas propuestas artísticas desde la perspectiva que proporciona el marco teórico relativo a la construcción de la identidad nacional y sus relaciones con la de género.

  13. El tiempo equivalente de exposición al fuego en un edificio histórico

    Directory of Open Access Journals (Sweden)

    Orta, Belén

    2010-12-01

    Full Text Available When fire resistance of a structure is analysed, by means of Technical Building Code (CTE, it is possible to use simplified methods that fix values of resistances demanded from the structure, depending on use and building height of evacuation, independently of the sector, or it is possible to use the method of the equivalent Time that allows to consider the particular conditions of the studied sector (size, ventilation, structural material, active measures of fight against the fire, etc.. In most of projects the first route will be chosen, nevertheless when it is a question of a singular building that it needs a more detailed analysis, it will be appealed to the second one. This article exposes the difficulty of applying the method of the equivalent time by means CTE without consulting the Eurocode-1 (EC-1 or technical manuals. It is exposed up to where the Spanish norm comes and when it is necessary to come to the European one. The method is applied to a specific example, a space in two heights by a horizontal hollow in cover. Also it shows as the method of the equivalent time, as alternative, can generate a series of results with a wide dispersion of values obtained from the quantity of decisions that the rules allows depending on a few criteria that are not rigid. This diversity of results can make not learned person who does calculations, perplex. To finish conclusions on the obtained values are extracted and one thinks about the application of the method and the technician responsibility.

    Cuando se analiza la resistencia a fuego de una estructura, según el Código Técnico de Edificación (CTE, se puede recurrir a métodos simplificados que fijan valores de resistencias exigidas a la estructura, en función del uso y de la altura de evacuación del edificio, independientemente del sector, o bien se puede emplear el método del tiempo equivalente que permite considerar las condiciones particulares del sector estudiado (el tama

  14. Armas de fuego en el entorno urbano y políticas públicas de control

    Directory of Open Access Journals (Sweden)

    Luis Gerardo Gabaldón

    2017-02-01

    Full Text Available El artículo refiere datos de tres encuestas de victimización por armas de fuego levantadas en parroquias de Caracas, Venezuela, entre 2011 y 2012. Se observó predominancia de hombres y jóvenes como víctimas y victimarios y mayor incidencia de hechos contra las personas en los estratos más bajos. La denuncia se encuentra por debajo de los índices de otros estudios nacionales de victimización, aunque los hechos son calificados como graves por más del 80% de los encuestados y casi 90% considera riesgoso poseer armas de fuego en el hogar. El artículo concluye con una revisión de los resultados y propuestas de la Comisión Presidencial para el Control de Armas, Municiones y Desarme y las perspectivas para una política pública consensuada de control de la violencia asociada a las armas de fuego. O artigo apresenta dados de três pesquisas de vitimização por armas de fogo feitas em Caracas, Venezuela, entre 2011 e 2012. Observou-se a predominância de homens e jovens como vítimas e perpetradores e maior incidência de eventos contra as pessoas nos estratos sociais mais baixos. A denúncia é inferior às taxas de outros estudos nacionais de vitimização, embora os atos sejam classificados como graves por mais de 80% dos entrevistados e quase 90% considera arriscado possuir armas de fogo em casa. O artigo conclui revisando os resultados e propostas da Comissão Presidencial para o Controle de Armas, Munições e Desarmamento e as perspectivas de uma política pública de controle da violência associada a armas de fogo.Palavras-chave: armas de fogo, violência, crime, política pública, Venezuela Firearms in the Urban Environment and Public Control Policies reports data from three firearms victimization surveys carried out in Caracas, Venezuela, between 2011 and 2012. It was observed prevalence of men and youth as victims and perpetrators and a higher incidence of acts against people in the lower social stratas. The complaint is

  15. Evolución de la composición florística Post-fuego en un carrascal de Navarra (n de España

    Directory of Open Access Journals (Sweden)

    Cavero, R. Y.

    1999-12-01

    Full Text Available This paper presents results about floristic composition dynamics during four years after controlled fires in a Mediterranean pin-oak wood in Navarra (N Spain. The samples have been taken from eight permanent 1 m2 plots subjected to different treatments: different fire type, different situation on the field, and with or without not fired soil addition. The regeneration strategies of the species and the influence of the different treatments on the flora are analyzed. The floristic composition dynamics follows a general model: the species began to appear progressively. The number of species grows gradually to reach a maximum between one and three years after the fire. Later, the number of species diminishes. Post fire species are those that existed before the fire, that is to say, there is an autosuccession process.

    [es] Se presentan los resultados de cuatro años de estudio sobre la evolución de la composición florística de un carrascal mediterráneo sometido a fuegos controlados en Navarra (N de España. Los muestreos se han llevado a cabo en ocho cuadrados permanentes de 1 m2 de superficie, cada uno sometido a distinto tratamiento: distinto tipo de fuego, distinta situación en la parcela y adición o no de suelo no quemado. Se analizan la estrategia de regeneración de las especies que aparecen después de los fuegos y la influencia de los tratamientos en la regeneración de la flora. La evolución de la composición florística sigue un modelo general: las especies empiezan a aparecer progresivamente, su número crece hasta obtener un máximo entre el año y los cuatro años después de los fuegos, a partir del cual disminuye. Las especies que aparecen son las mismas que había previamente, es decir, se da un proceso de autosucesión. [fr] On présente les résultats de quatre ans d'étude sur l'évolution de la composition floristique d'un bois de chêne vert méditerranéen soumis à des feux contr

  16. Alternativas de manejo de la fertilidad del suelo en ecosistemas agropecuarios Management alternatives of soil fertility in livestock production ecosystems

    Directory of Open Access Journals (Sweden)

    Saray Sánchez

    2011-12-01

    Full Text Available En Cuba, debido a la degradación que presentan los suelos, se requiere de un manejo integrado para potenciar su capacidad productiva en beneficio del hombre y lograr el desarrollo sostenible y la seguridad alimentaria. Esta situación demanda que los profesionales, técnicos y responsables de la producción agropecuaria amplíen sus conocimientos relacionados con el manejo y conservación de este recurso, de modo que con su trabajo se pueda lograr un equilibrio en el sistema suelo-planta-animal, que posibilite mejorar el medio ambiente, lograr producciones más ecológicas y obtener mayores beneficios económicos y sociales para el país. En este artículo se presentan algunos resultados generados en diferentes instituciones científicas en cuanto al uso de tecnologías adecuadas en el manejo de la fertilidad del suelo en ecosistemas agropecuarios, así como las experiencias de su introducción en la práctica productiva con el fin de contribuir al desarrollo sostenible y la seguridad alimentaria en Cuba.In Cuba, due to soil degradation, integrated management is required to enhance their productive capacity in benefit of man and achieve sustainable development and the necessary food security. This situation demands that the professionals, technicians and people responsible for livestock production increase their knowledge related to the management and conservation of this resource, so that with their work balance can be achieved in the soil-plant-animal system, which allows improving the environment, achieving more ecological productions, and attaining higher economic and social benefits for the country. In this paper some results are shown generated in different scientific institutions regarding the use of adequate technologies of soil fertility management in agricultural and livestock production ecosystems, as well as the experiences of their introduction in productive practice in order to contribute to sustainable development and food

  17. Dos «coplas del fuego» sefardíes en busca de autor

    Directory of Open Access Journals (Sweden)

    Romero, Elena

    2005-01-01

    Full Text Available The present article presents the edition and study of two anonymous Sephardic coplas, namely the so-called El incendio de Salónica de 1839, preserved in a manuscript from Belgrade (1861, and El incendio de Constantinopla de 1883, known from four oral versions. The author suggests the exact place and date of the fires, as well as the authorship of both compositions, namely Sa‘adi Halevi and Ya‘aqob Yonah, respectively. If the interpretation proves correct, these coplas would constitute the oldest extant compositions by the two famous Saloniki copleros.

    En el presente artículo se editan y estudian dos coplas sefardíes que nos han llegado anónimas: las denominadas El incendio de Salónica de 1839, procedente de un manuscrito de Belgrado (1861; y El incendio de Constantinopla de 1883, conservada en cuatro versiones orales. En el estudio la autora determina el lugar y fecha de los incendios, así como sus posibles autorías -Sa‘adí Haleví y Ya‘acob Yoná, respectivamente-; de estar en lo cierto, se trataría de las coplas más antiguas que hoy por hoy conocemos de esos dos famosos copleros salonicenses.

  18. QBO Modulation of the Mesopause Gravity Wave Momentum Flux over Tierra del Fuego

    Science.gov (United States)

    De Wit, R. J.; Janches, D.; Fritts, D. C.; Hibbins, R. E.

    2016-01-01

    The interannual variability of the mesosphere and lower thermosphere (MLT) gravity wave momentum flux over southern mid latitudes (53.7degS) has been studied using more than 7 years of meteor radar observations at Ro Grande, Argentina. A modulation, with periods similar to that of the equatorial stratospheric quasi-biennial oscillation (QBO), is observed in the vertical flux of zonal as well as meridional momentum. The QBO signal is largest in the zonal component during summer and is in phase with the stratospheric QBO at 50 hPa (approx. 21 km). The relation between the stratospheric QBO and the QBO modulation in the MLT gravity wave forcing (derived from the divergence of the momentum flux) was found to be consistent with that expected from the Holton-Tan effect coupled to the interhemispheric coupling mechanism. These results provide the first observational support for the existence of the midlatitude gravity wave forcing anomalies as hypothesized in the interhemispheric coupling mechanism.

  19. Analysis of the interaction of deuterium plasmas with tungsten in the Fuego-Nuevo II device

    Science.gov (United States)

    Ramos, Gonzalo; Castillo, Fermín; Nieto, Martín; Martínez, Marco; Rangel, José; Herrera-Velázquez, Julio

    2012-10-01

    Tungsten is one of the main candidate materials for plasma-facing components in future fusion power plants. The Fuego-Nuevo II, a plasma focus device, which can produce dense magnetized helium and deuterium plasmas, has been adapted to address plasma-facing materials questions. In this paper we present results of tungsten targets exposed to deuterium plasmas in the Fuego Nuevo II device, using different experimental conditions. The plasma generated and accelerated in the coaxial gun is expected to have, before the pinch, energies of the order of hundreds eV and velocities of the order of 40,000 m s-1. At the pinch, the ions are reported to have energies of the order of 1.5 keV at most. The samples, analysed with a scanning electron microscope (SEM) in cross section show a damage profile to depths of the order of 580 nm, which are larger than those expected for ions with 1.5 keV, and may be evidence of ion acceleration. An analysis with the SRIM (Stopping Range of Ions in Matter) package calculations is shown.

  20. Necrosis Avascular Bilateral de cadera en paciente con VIH y traumatismo de arma de fuego.

    Directory of Open Access Journals (Sweden)

    Belkis J Menoni Blanco

    2011-01-01

    Full Text Available La Necrosis Avascular de Cadera (NAV es un proceso patológico infrecuente, originado por faltade irrigación de la articulación coxofemoral que implica necrosis y degeneración de los huesos que la conforman, causando dolor e impotencia funcional. Es más frecuente en varones jóvenes, pudiendo ser unilateral o bilateral. La etiología puede ser idiopática o estar relacionada a causas sistémicas como infección por VIH y su tratamiento depende de la severidad. En este reporte, se presenta un caso masculino de 35 años, seropositivo con tratamiento antirretroviral y antecedente de herida por arma de fuego de presentación inusual en cadera, sin lesión ósea aparente; quien refiere dolor de cadera izquierda, de fuerte intensidad, punzante, irradiado a rodilla izquierda, que produce limitación funcional. Al examen físico se evidencia marcha de Trendelemburg, con signos de Thomas y Patrick positivos. La radiografía demuestra NAV tipo Ficat-Arlet IV y es corregida mediante artroplastia total de cadera izquierda. Palabras claves: Necrosis Avascular de Cabeza de Fémur, VIH, Herida por arma de fuego.

  1. The shallow-water fish assemblage of Isla del Coco National Park, Costa Rica: structure and patterns in an isolated, predator-dominated ecosystem

    Directory of Open Access Journals (Sweden)

    Alan M. Friedlander

    2012-11-01

    Full Text Available Fishes at Isla del Coco National Park, Costa Rica, were surveyed as part of a larger scientific expedition to the area in September 2009. The average total biomass of nearshore fishes was 7.8 tonnes per ha, among the largest observed in the tropics, with apex predators such as sharks, jacks, and groupers accounting for nearly 40% of the total biomass. The abundance of reef and pelagic sharks, particularly large aggregations of threatened species such as the scalloped hammerhead shark (up to 42 hammerheads ha-1 and large schools of jacks and snappers show the capacity for high biomass in unfished ecosystems in the Eastern Tropical Pacific. However, the abundance of hammerhead and reef whitetip sharks appears to have been declining since the late 1990s, and likely causes may include increasing fishing pressure on sharks in the region and illegal fishing inside the Park. One Galapagos shark tagged on September 20, 2009 in the Isla del Coco National Park moved 255km southeast towards Malpelo Island in Colombia, when it stopped transmitting. These results contribute to the evidence that sharks conduct large-scale movements between marine protected areas (Isla del Coco, Malpelo, Galápagos in the Eastern tropical Pacific and emphasize the need for regional-scale management. More than half of the species and 90% of the individuals observed were endemic to the tropical eastern Pacific. These high biomass and endemicity values highlight the uniqueness of the fish assemblage at Isla del Coco and its importance as a global biodiversity hotspot.

  2. The shallow-water fish assemblage of Isla del Coco National Park, Costa Rica: structure and patterns in an isolated, predator-dominated ecosystem

    Directory of Open Access Journals (Sweden)

    Alan M. Friedlander

    2012-11-01

    Full Text Available Fishes at Isla del Coco National Park, Costa Rica, were surveyed as part of a larger scientific expedition to the area in September 2009. The average total biomass of nearshore fishes was 7.8 tonnes per ha, among the largest observed in the tropics, with apex predators such as sharks, jacks, and groupers accounting for nearly 40% of the total biomass. The abundance of reef and pelagic sharks, particularly large aggregations of threatened species such as the scalloped hammerhead shark (up to 42 hammerheads ha-1 and large schools of jacks and snappers show the capacity for high biomass in unfished ecosystems in the Eastern Tropical Pacific. However, the abundance of hammerhead and reef whitetip sharks appears to have been declining since the late 1990s, and likely causes may include increasing fishing pressure on sharks in the region and illegal fishing inside the Park. One Galapagos shark tagged on September 20, 2009 in the Isla del Coco National Park moved 255km southeast towards Malpelo Island in Colombia, when it stopped transmitting. These results contribute to the evidence that sharks conduct large-scale movements between marine protected areas (Isla del Coco, Malpelo, Galápagos in the Eastern tropical Pacific and emphasize the need for regional-scale management. More than half of the species and 90% of the individuals observed were endemic to the tropical eastern Pacific. These high biomass and endemicity values highlight the uniqueness of the fish assemblage at Isla del Coco and its importance as a global biodiversity hotspot.La biomasa promedio de peces costeros en el Parque Nacional Isla del Coco en septiembre de 2010 fue de 7,8 toneladas por hectárea, entre las más elevadas halladas jamás en zonas tropicales. Los grandes depredadores representaron el 40% de la biomasa total. La abundancia de tiburones costeros y pelágicos, particularmente las enormes agregaciones de tiburón martillo (hasta 42 individuos por hectárea y los

  3. Herida por proyectil de arma de fuego en un niño: Presentación de un caso Gunshot wound in a child: A case report

    Directory of Open Access Journals (Sweden)

    Juan Carlos Quintana Díaz

    2005-08-01

    Full Text Available Se presenta la evolución de un paciente masculino de 10 años que sufrió una herida por proyectil de arma de fuego en el párpado superior izquierdo jugando con otro niño, lo que lo provocó una ptosis palpebral marcada. Se realizó estudio radiográfico preoperatorio donde se encontró el proyectil alojado en la pared orbitaria superior. Se constató una excelente evolución posoperatoria del paciente una vez intervenido quirúrgicamente.The evolution of a 10-year-old male patient who had a marked palpebral ptosis as a result of a wound made by a bullet in the left upper eyelid while playing with another child, is presented. A preoperative radiographic study was conducted and the projectile was found in the upper orbital wall. An excellent postoperative evolution was observed once the patient underwent surgery.

  4. On the use of UAVs at active volcanoes: a case study from Volcan de Fuego, Guatemala

    Science.gov (United States)

    Watson, M.; Chigna, G.; Wood, K.; Richardson, T.; Liu, E.; Schellenberg, B.; Thomas, H.; Naismith, A.

    2017-12-01

    Volcan de Fuego, Guatemala, is one of Central America's most active systems. More than one hundred thousand people live within ten kilometres of the summit, many of them in profound poverty. Both the summit region and the volcano's steep sided valleys present significant access challenges, mostly associated with unacceptably high risk. Unmanned aerial vehicles (UAVs) offer the opportunity to observe, map and quantify emissions of tephra, gas, lava and heat flux and, using structure from motion algorithms, model dynamic topography. During recent campaigns, the team have completed observations of changes in the summit morphology immediately prior a paroxysmal eruption, mapped the key drainage systems after the fifth of May 2017 eruption and sampled the plume for tephra and gases using a range of onboard instruments. I will present the group's findings within a broader context of hazard mitigation and physical volcanology, and discuss the future of UAVs in volcano monitoring and research.

  5. La glosa de 1541 a los refranes que dizen las viejas tras el fuego

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    Hugo O. Bizzarri

    2001-11-01

    Full Text Available The Marqués de Santillana's Refranes que dizen las viejas tras el fuego had a widely Spreads diffusion during the XVIth century. The printing made in 1541 by Francisco Fernández de Córdoba not only points out a particular way of reception -that of the illustrated collection with short moral glosses- but also was one of the fundamental sources to Juan de Mal Lara's Philosophia vulgar (Sevilla, 1568. A transcription of the1541 printing preserved in only one copy which ­mproves Sbarbi's edition (1874 is presented in this article. This is, thus, an attempt to bring materials to the study of the Hispanic Refranero's early printed stage.

  6. Recuperación post-fuego de la comunidad de líquenes epífitos en la provincia de Córdoba, Argentina Post-fire recovery of the epiphytic-lichen community in Cordoba province, Argentina

    Directory of Open Access Journals (Sweden)

    Juan Manuel Rodriguez

    2009-09-01

    Full Text Available Los líquenes son reconocidos bioindicadores de la calidad del ambiente. Estudios de comunidades de líquenes en relación a los incendios forestales, han demostrado como responden al fuego por encima de las variables microambientales que modelan la comunidad en ausencia de este disturbio. El objetivo de la presente contribución es reconocer el efecto del fuego en la comunidad de líquenes del Bosque Serrano en Córdoba. Se seleccionaron dos zonas, una testigo y otra sometida a fuego en 1996. A través de un muestreo sistemático y estandarizado se relevó la presencia y cobertura de especies de líquenes en árboles y arbustos en las dos áreas estudiadas. Entre el área testigo y el incendiado la diversidad y cobertura de líquenes es similar pero varia su composición. Las especies en la zona incendiadas corresponden a líquenes heliófilos y adaptados a situaciones de estrés. El fuego como disturbio frecuente favorece la presencia de pocas especies con importantes coberturas que resistan las condiciones que el disturbio impone. Los incendios de alta intensidad y frecuencia dejan a la comunidad de líquenes sin posibilidades de desarrollo, disminuyendo la diversidad general y la calidad de los sistemas forestales en los que viven.Lichens are recognized bioindicators of environmental quality. Studies of lichen communities in relation to forest fires have shown the response to fire over micro-environmental variables that shape the community in the absence of this disturbance. The aim of this contribution is to recognize the effect of fire on the lichen community of Sierra Chaco in Cordoba province. Two areas were selected, one without past fire and the other with fire in 1996. Coverage and presence of lichen species on trees and shrubs were recorded in the two areas using systematic, standardized sampling. Diversity and coverage of lichens is similar between the two areas but composition varies. The lichen species in the burned area are

  7. Los indicadores de la dimensión social del desarrollo sostenible, el caso de Tierra del Fuego.

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    Mariano Hermida

    2017-11-01

    Full Text Available En el presente documento haremos especial énfasis en la dinámica social involucrada en el desarrollo sostenible, para ello parece necesario un recorrido teórico metodológico sobre el concepto en análisis. A su vez utilizaremos a la provincia más austral de la República Argentina como ejemplo para el desarrollo de la presente propuesta, en este sentido observaremos las dinámicas socio demográficas y socio económicas de la región, finalmente presentaremos los indicadores sociales propuestos en base a distintos criterios, principalmente los respectivos al abordaje teórico y a la calidad y disponibilidad de los datos.

  8. Herida facial por arma de fuego: presentación de un caso Facial wound caused by firearm: A case psresentation

    Directory of Open Access Journals (Sweden)

    Juan Carlos Quintana Díaz

    2007-06-01

    Full Text Available Se presenta un caso de un niño yemenita de 6 años de edad del poblado de Maabar que fue atendido por el equipo interdisciplinario de profesores cubanos del Hospital Al Waheda perteneciente a la Universidad de Thamar, el cual recibió una herida maxilofacial por proyectil de arma de fuego, que le ocasionó gran destrucción de los tejidos de la región nasal, zona por donde salió el proyectil. Se expone en el trabajo cómo se le salvó la vida a este niño y se reconstruyó el defecto facial gracias a la ardua labor de los profesores cubanos, que devolvieron a este niño a la sociedad con vida, con una excelente rehabilitación estética y funcional, demostrando una vez mas la humana labor de la medicina cubana en países hermanos.The case of a Yemenite child aged 6 with a maxillofacial wound caused by firearm involving destruction of nasal area tissues, oulet point of projectile, he is resident of Maabar built-up area is presented, who was cared by interdisciplinary staff of Cuban professors of Al Waheda Hospital of Thamar University. In present paper is showed the way how his life was saved, and facial defect was reconstructed thanks to arduous work of Cuban professors, who returned this child alive to society with an excellent cosmetic and functional rehabilitation, showing once again the human work of Cuban medicine in brother countries.

  9. Manejo terapéutico inicial de las heridas por arma de fuego en el territorio maxilofacial Initial therapeutic management of firearm wounds in the maxillofacial area

    Directory of Open Access Journals (Sweden)

    L. Ruiz Laza

    2006-10-01

    Full Text Available Introducción. Las heridas por armas de fuego son poco frecuentes en nuestro medio, de ahí que la experiencia en el manejo de las mismas sea limitada. En este artículo mostramos la experiencia de nuestro Servicio en el tratamiento de estas lesiones y realizamos una revisión del tema para intentar protocolizar la actuación inicial ante este tipo de pacientes. Material y Método. Presentamos seis casos tratados en nuestro Servicio durante el año 2002. Estudiamos las características demográficas, etiología, patrón de lesiones y tratamiento recibido. Resultados. Cinco hombres y una mujer presentaron heridas por arma de fuego durante este período, con una edad media de 38 años (Rango 13-74. La etiología más frecuente fue la agresión, seguido del intento de autolisis. Sólo un paciente requirió estabilización urgente de vía aérea mediante traqueotomía. No existieron complicaciones postoperatorias y sólo un enfermo requirió intervenciones secundarias por secuelas. Discusión. El aspecto más controvertido en el tratamiento de estas lesiones es el manejo quirúrgico de pacientes con lesiones extensas de la cara que involucran partes blandas y hueso, ya que pueden tratarse con técnicas reconstructivas complejas en el primer acto operatorio o, por el contrario, esta reconstrucción se puede realizar de forma diferida tras una primera fase de tratamiento quirúrgico de desbridamiento, estabilización de fracturas y cierre de partes blandas con técnicas simples. Pensamos que la elección del tipo de tratamiento debe ser individualizada en cada caso, aunque solemos optar por una reconstrucción diferida de los defectos tan pronto como sea posible.Introduction. The firearm injuries are not very common in our country, and the experience in its management is limited. In this review we show the experience of our Service in this wounds and review the literature to systematize the initial management of the firearm injuries in maxillofacial

  10. Fuego y Agua a la luz de la crónica de Viena.

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    María Concepción Porras Gil

    2017-06-01

    Full Text Available A finales de la Edad Media y a lo largo de la Edad Moderna, todos los aspectos que rodeaban a un príncipe servían para construir una imagen de poder. Un modelo que ordenaba contenidos y formas, y llevaba al heroísmo, a través de la historia, la utopía de buen gobierno representada por éste. Esta forma visual, revelada a través de ropas, gestos, magnificencia de los séquitos… se cuidó especialmente en el caso de entradas y fiestas urbanas, dónde las diferentes repúblicas compitieron por mostrar su relevancia y adhesión a la autoridad que ensalzaban. Por encima de lo habitual, como expresión de fausto se buscó la sorpresa, añadiendo a pendones, entoldados y otras formas de embellecimiento urbano, el empleo de fuegos y agua. A través de la Crónica de Viena se especifican algunos ejemplos en los que el fuego y el agua fueron determinantes, consiguiendo transformar la realidad en una estilización poetizada, definida por quienes la vieron como: “Gran Maravilla”. At the end of the Medieval Age and across the Modern Age, all the aspects surrounding a Prince used to be done in order to build an aspect of power. A model that ordered content and forms, leading towards heroism. Throughout history, the utopia of a good government was represented by this idea. This visual form, revealed throught clothes, gestures, the magnificent of the entourage… took special care in the case of entrances and urban parties, where diferent republics competed to show their relevance and union to the authority they extolled. Above usual, splendorous expression led to surprise, adding banners , awnings and others forms of beauty common in a city, like fires and water. Viena’s Chronicles specify some examples when fire and water were decisive, getting success when it comes to transform reality in a lyrical stylization, defined by whom saw it as: “Great Marvel”.

  11. Millennium Ecosystem Assessment: MA Ecosystems

    Data.gov (United States)

    National Aeronautics and Space Administration — The Millennium Ecosystem Assessment: MA Ecosystems provides data and information on the extent and classification of ecosystems circa 2000, including coastal,...

  12. A sensitivity analysis of volcanic aerosol dispersion in the stratosphere. [Mt. Fuego, Guatemala eruptions

    Science.gov (United States)

    Butler, C. F.

    1979-01-01

    A computer sensitivity analysis was performed to determine the uncertainties involved in the calculation of volcanic aerosol dispersion in the stratosphere using a 2 dimensional model. The Fuego volcanic event of 1974 was used. Aerosol dispersion processes that were included are: transport, sedimentation, gas phase sulfur chemistry, and aerosol growth. Calculated uncertainties are established from variations in the stratospheric aerosol layer decay times at 37 latitude for each dispersion process. Model profiles are also compared with lidar measurements. Results of the computer study are quite sensitive (factor of 2) to the assumed volcanic aerosol source function and the large variations in the parameterized transport between 15 and 20 km at subtropical latitudes. Sedimentation effects are uncertain by up to a factor of 1.5 because of the lack of aerosol size distribution data. The aerosol chemistry and growth, assuming that the stated mechanisms are correct, are essentially complete in several months after the eruption and cannot explain the differences between measured and modeled results.

  13. Necrosis Avascular Bilateral de cadera en paciente con VIH y traumatismo de arma de fuego.

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    Belkis J. Menoni Blanco

    2009-01-01

    Full Text Available La Necrosis Avascular de Cadera (NAV es un proceso patológico infrecuente, originado por falta de irrigación de la articulación coxofemoral que implica necrosis y degeneración de los huesos que la conforman, causando dolor e impotencia funcional. Es más frecuente en varones jóvenes, pudiendo ser unilateral o bilateral. La etiología puede ser idiopática o estar relacionada a causas sistémicas como infección por VIH y su tratamiento depende de la severidad. En este reporte, se presenta un caso masculino de 35 años, seropositivo con tratamiento antirretroviral y antecedente de herida por arma de fuego de presentación inusual en cadera, sin lesión ósea aparente, quien refiere dolor de cadera izquierda, de fuerte intensidad, punzante, irradiado a rodilla izquierda, que produce limitación funcional. Al examen físico se evidencia marcha de Trendelemburg, con signos de Thomas y Patrick positivos. La radiografía demuestra NAV tipo Ficat-Arlet IV y es corregida mediante artroplastia total de cadera izquierda.

  14. El incremento de la mortalidad por armas de fuego y su relación con el estancamiento de la esperanza de vida en México

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    Guillermo Julián González-Pérez

    Full Text Available Resumen Este estudio analiza la mortalidad por armas de fuego (AF en México y su impacto en la esperanza de vida (EV – comparado con otras causas de muerte- entre los trienios 2000-2002 y 2010-2012 e identifica el papel de los grupos de edad en la pérdida de años de EV por esta causa. A partir de datos oficiales se elaboraron tablas de vida abreviadas para México, por sexo, para ambos trienios; esto permitió calcular la EV temporaria entre 15 y 75 años y los años de esperanza de vida perdidos (AEVP entre ambas edades, por causa. Entre los hombres, la mortalidad por AF pasó de ser la causa que menos AEVP provocó en 2000-2002 a ser la principal causa de AEVP entre 15 y 75 años en 2010-2012. Entre las mujeres, fueron los AEVP por esta causa los que relativamente más crecieron. En ambos sexos el mayor aumento de los AEVP por AF fue entre 20 y 34 años. Los hallazgos indican que el aumento de la mortalidad por AF, sobre todo entre los jóvenes, ha contribuido sustancialmente al estancamiento de la esperanza de vida, e incluso a su descenso entre los hombres. Esto refleja que la violencia ligada a las AF no es solo un problema de seguridad sino también un problema de salud colectiva que debe ser afrontado de forma interdisciplinaria e intersectorial si se pretende incrementar la esperanza de vida del país.

  15. Aplicaciones ergonomicas para la mejoria del rendimiento de los brigadistas de incendios forestales

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    Felipe Esteban Meyer Cohen

    2003-07-01

    Full Text Available El presente estudio se generó como parte de un proyecto financiado por una agencia estatal denominada FONDEF, con el apoyo de cinco grandes empresas forestales. Su objetivo principal fue conocer la respuesta humana en el combate de incendios forestales, con el fin de contribuir a la organización de  programas de combate del fuego seguros y eficientes. Para cumplir con los objetivos específicos, fue necesario efectuar estudios en incendios y en  construcción de líneas de fuego. En los incendios se midió la respuesta fisiológica impuesta por la exposición a calor y el trabajo físico, registrándose continuamente la frecuencia cardíaca de los brigadistas. Se midieron también las temperaturas de bulbo seco, húmedo y de globo, la pendiente del terreno, las características del combustible, el estado del incendio y la calidad y el rendimiento,  obtenidos en brigadistas combatiendo el fuego en 605 ocasiones. Por su parte,  los ensayos de construcción de línea se llevaron a cabo  para establecer, bajo condiciones controladas, el efecto de las pausas y relevos.  

  16. DESPRECIADOS Y DESECHADOS. ITINERARIO DE LA CANUTOFOBIA EN CHILE EN LA PRIMERA MITAD DEL SIGLO XX

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    Miguel Ángel Mansilla

    2007-12-01

    Full Text Available Este artículo analiza testimonios y relatos publicados en las Revistas Fuego de Pentecostés (RFP sobre la discriminación e intolerancia religiosa que vivieron los pentecostales chilenos en la primera mitad del siglo XX. Se describen las formas y los espacios en que se materializaron dichas actitudes y prejuicios explicitadas en distintas metáforas ignominiosas como canutos y locos, sufridos principalmente en los templos pentecostales, predicaciones callejeras y el trabajo.

  17. Disruption of ecosystem processes in western North America by invasive species

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    Jeffrey S. Dukes

    2004-09-01

    Full Text Available Many ecosystems of western North America have been dramatically changed by non-native species. Here, we review ecological impacts of 56 plant, animal, fungus, and protist species that were brought to this region by humans. We discuss characteristics of invasive species that can lead to major ecosystem impacts, and explore how invasive species alter many different attributes of ecosystems. Specifically, we include examples of invasive species that affect geomorphology, fire regimes, hydrology, microclimate, atmospheric composition, nutrient cycling, and productivity. Finally, we review the direct consequences of biological invasions for some native species. We summarize examples from this paper in Appendix 1. Our examples illustrate how, as invasive species have become dominant across large areas of western North America's grassland, shrubland, dune, riparian, and estuarine ecosystems, the properties and functioning of these systems have changed. To date, some systems in this region, such as its forests, remain relatively unaffected by invasive species. However, recent attacks of forest pathogens highlight the potential vulnerability of these ecosystemsMuchos ecosistemas de Norteamérica occidental han cambiado dramáticamente a causa del efecto producido por especies no autóctonas. Aquí se muestra una revisión del impacto ecológico producido por 56 especies diferentes de plantas, animales y hongos, y especies de protistas que fueron traídos a esta región por humanos. Discutimos las características de las especies invasoras que pueden producir un gran impacto en el ecosistema, y exploramos cómo las especies invasoras pueden alterar de forma muy diferente los atributos de un ecosistema. Específicamente, incluimos ejemplos de especies invasoras que afectan a la geomorfología, a los regímenes del fuego, a la hidrología, al microclima, a la composición atmosférica, al ciclo de nutrientes, y a la productividad. Finalmente, revisamos las

  18. Ecosystem Services

    Science.gov (United States)

    Ecosystem goods and services are the many life-sustaining benefits we receive from nature and contribute to environmental and human health and well-being. Ecosystem-focused research will develop methods to measure ecosystem goods and services.

  19. Diseño de conexiones mecánicas tipo canal en vigas compuestas bajo fuego//Design of channel mechanical connections in composite beam in

    Directory of Open Access Journals (Sweden)

    Yisel Larrua‐Pardo

    2015-01-01

    Full Text Available En este trabajo se propusieron dos métodos, uno simplificado y otro gráfico alternativo para el diseño de la conexión mecánica tipo canal en vigas compuestas de hormigón y acero en situación de incendio, a partir del estudio de su comportamiento. Se utilizó como herramienta la modelación numérica. El método simplificado desarrollado considera temperaturas definidas a través de la modelación térmica del ensayo push-out en situación de incendio y es coherente con las expresiones de diseño de las conexiones mecánicas tipo canal a temperatura ambiente y la formulación existente para el diseño de las conexiones tipo perno a elevadas temperaturas. El método gráfico alternativopropuesto constituye una opción que permite obtener de una forma directa y rápida, la resistencia a elevadas temperaturas de la conexión mecánica tipo canal para un tiempo de resistencia al fuego, en función de su resistencia a temperatura ambiente.Palabras claves: conexión mecánica tipo canal, método simplificado, método gráfico alternativo, modelación numérica, incendio._______________________________________________________________________________AbstractIn this paper two methods to design of channel mechanical connection are proposed, a simplified one and graphical alternative another, both using the numerical analysis for the study of the mechanical connection behavior. The developed simplified method considers temperatures defined through thethermal modelling of the push-out test in fire and it is coherent with the design expressions of the channel mechanical connections to ambient temperature, and the current formulation for the design of the stud connections al elevated temperatures. The proposed alternative graphical method constitutes an option that allows obtaining, in a direct and quick way, the resistance to elevatedtemperatures of the channel mechanical connections for a determined time of resistance to the fire, according to its

  20. Influencia de los defecaderos de camélidos sobre el desarrollo vegetal y riqueza de especies en morrenas glaciales, Tierra del Fuego Camelid defecation influences vegetation development and species richnesss on glacial moraines, Tierra del Fuego

    Directory of Open Access Journals (Sweden)

    JUAN M. HENRÍQUEZ

    2004-09-01

    Full Text Available Los escasos trabajos de interacción planta-herbívoro en ambientes severos han concluido que los herbívoros tienen un rol menor sobre el proceso de colonización en los estados tempranos de la sucesión. Aquí se documentan los efectos de defecaderos de un herbívoro ungulado (Lamma guanicoe sobre los patrones vegetales en una intermorrena glacial reciente. Se evaluó la composición florística, frecuencia y síndrome de dispersión de las especies presentes sobre los defecaderos y sitios control. Parámetros de suelo fueron analizados en ambos substratos. La riqueza y diversidad de especies vasculares fueron significativamente mayores sobre los defecaderos. El síndrome de dispersión dominante es la anemocoría en la vegetación de ambos tipos de substratos. Los defecaderos presentan valores superiores de materia orgánica, nitrógeno y fósforo, indicando condiciones localmente más favorables para el establecimiento de plántulas en este ambiente pobre en nutrientes y materia orgánica. Finalmente, se discute acerca de los posibles mecanismos que originan la mayor riqueza y diversidad de especies sobre los defecaderos de guanaco, concluyendo que constituyen una fuente potencial de propágulos que puede acelerar el proceso de colonización en morrenas glaciaresThe few studies of herbivore-plant interaction in severe environments have concluded that the herbivores have a minor role on the process of colonization in the early states of the succession. This paper describes the effects of camelid (Lamma guanicoe dung heaps on vegetation patterns on a recent glacial moraine. Floristic composition, diversity, abundance and dispersion syndrome spectra of the vegetation growing on dung heaps was compared with that of control sites unaffected by camelid defecation. Soil parameters of both substrates were analyzed. Vascular species riches and diversity were significantly higher on dung heaps. Anemochory was the dominant dispersion syndrome on both substrate types. Dung heaps had higher levels of organic matter, nitrogen and phosphorus, suggesting more favorable substrate conditions. Thus, dung heaps appear to offer favorable sites for seedling establishment in an otherwise resource-poor environment, and their role as seed sources could accelerate the process of colonisation of glacial moraines

  1. MEDICINA DEL RENACIMIENTO ESPAÑOL

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    Adolfo de Francisco Zea

    1984-11-01

    Full Text Available

    Arnold Toynbee, historiador y filósofo inglés, en su "Estudio de la Historia" postula la tesis de que las civilizaciones crecen y se desarrollan en la medida en que son capaces de responder con éxito a los desafíos que se les presentan.

    Cuando esto no ocurre así, como es el caso de los nómadas mongoles del Asia Central, que tuvieron que enfrentarse a las difíciles exigencias de la vida en las estepas, terminan transformándose en esclavos de su medio ambiente lo que las torna incapaces de cualquier
    actividad creadora.

    No ocurre lo mismo con la mayoría de las civilizaciones occidentales, en las cuales cada reto ha determinado una respuesta exitosa que a la vez provoca desequilibrios que requieren nuevos ajustes creativos. Este impulso o "elan" del crecimiento, para usar la terminología de Bergson, está ejemplificado en el mito de Prometeo que atraviesa con su antorcha las esferas celestes para robar a Zeus el fuego para el hombre, y persuadirle de la necesidad de permitir el desarrollo perpetuo de la Humanidad.
    En el centro de una miniatura del siglo XV, aparece Prometeo animando la figura inerte del Hombre en el Paraíso. El fuego prometeico es una fuerza que da la vida, pero además simboliza el ardor de la curiosidad intelectual y del conocimiento, lo cual lleva consigo implícito el fruto peligroso de esa misma curiosidad...

  2. Estrategias de ideación y producción contemporáneas en las artes del fuego

    OpenAIRE

    Grassi, María Celia

    2014-01-01

    Este proyecto continua con la línea de investigación iniciada en el proyecto «Alternativas de tratamiento en la cerámica contemporánea. Serigrafía y fotocerámica. Mixes procedimentales». El asunto tratado es el desarrollo los mixes procedimentales en cerámica para ampliar los recursos estéticos y/o tecnológicos de los realizadores creativos en este campo. La nueva propuesta pretende dar un salto cualitativo centrado en las estrategias de ideación y de producción de los desarrollos espaciales ...

  3. CULTURE STUDIES ON THE LIFE-HISTORY OF CHORDARIA-LINEARIS (PHAEOPHYCEAE) FROM TIERRA-DEL-FUEGO, SOUTH-AMERICA

    NARCIS (Netherlands)

    PETERS, AF

    1992-01-01

    Studies of laboratory cultures of Chordaria linearis (Hooker et Harvey) Cotton from southernmost South America revealed that this species has an obligate sexual life history in which a macroscopic sporophyte alternates with a monoecious microscopic gametophyte. Sexual reproduction is isogamous and

  4. Long-term monitoring of thinning for silvopastoral purposes in Nothofagus antarctica forests of Tierra del Fuego, Argentina

    Directory of Open Access Journals (Sweden)

    Guillermo Martínez Pastur

    2018-05-01

    Research highlights: Monitoring of thinning for silvopastoral management must include easy and cheap measuring variables, e.g. diameter growth as a proxy for timber production objectives and hemispherical photos (crown cover and radiation as a proxy for pasture production. Long-term monitoring allowed to identify reliable indicators that assist new sustainable management alternatives.

  5. Early Diagnosis of Congenital Trypanosoma cruzi Infection, Using Shed Acute Phase Antigen, in Ushuaia, Tierra del Fuego, Argentina

    Science.gov (United States)

    Mallimaci, María Cristina; Sosa-Estani, Sergio; Russomando, Graciela; Sanchez, Zunilda; Sijvarger, Carina; Alvarez, Isabel Marcela; Barrionuevo, Lola; Lopez, Carlos; Segura, Elsa Leonor

    2010-01-01

    Chagas' disease, or American trypanosomiasis, is caused by the protozoan parasite Trypanasoma cruzi. It is estimated that 15,000 new cases of congenital T. cruzi transmission occur in the Americas each year. The aim of this study was to estimate the rate of congenital T. cruzi infection in infants born to infected women living in Ushuaia, Argentina, as well to assess a serologic test using Shed Acute Phase Antigen (SAPA) for a timely diagnosis of congenital infection. The rate of congenital infection among children in the study was 4.4% (3/68). Our results show that for infants younger than 30 days of age, matched blood samples from mother and infant were capable of identifying congenital transmission of infection using an enzyme-linked immunosorbent assay with SAPA. For infants older than 3 months, congenital infection could be ruled out using the same procedure. PMID:20064996

  6. Early migration and estuary stopover of introduced chinook salmon population in the Lapataia River Basin, southern Tierra del Fuego Island

    Science.gov (United States)

    Chalde, T.; Fernández, D. A.

    2017-12-01

    Established populations of chinook salmon (Oncorhynchus tshawytscha) have recently been reported in South America, at both Atlantic and Pacific basins. Several studies have evaluated different aspects of their life histories; however, little is known about the use of the estuaries by the juveniles of these populations. We examined spawning time, seaward migration timing, growth rate, scale patterns, diet, and geometric morphometric, contrasting the early life history during freshwater and estuary residence of a chinook population established in Lapataia Basin. Fall run spawning took place in March-April and the parr emerged in September. Two distinct seaward migration patterns were identified from sein net fishing records: one population segment migrating earlier to the estuary in October and a second group migrating later in February. The growth rate of fish captured at the estuary was significantly higher than the fish captured in freshwater. In addition, higher scale intercirculi distances were observed in estuary fish showing differences in growth rate. The feeding habitat in fish captured in both environments changed through time from bottom feeding to surface feeding and from significant diet overlap to no overlap. The morphology of the fish captured at the estuary was associated with the elongation of the caudal peduncle and a decrease in the condition factor index, both changes related to smolt transformation. The earlier migration and the higher growth rate of juveniles in the estuary together with fish of 1 + yo captured in this environment reveal that the estuary of Lapataia Basin is not only a stopover for the chinook salmon, but also a key habitat to reside and feed previous to the final seaward migration.

  7. Feeding habits of the false southern king crab Paralomis granulosa (Lithodidae in the Beagle Channel, Tierra del Fuego, Argentina

    Directory of Open Access Journals (Sweden)

    Laura Inés Comoglio

    1999-12-01

    Full Text Available Stomach contents of 282 false southern king crabs (Paralomis granulosa, between 10 to 90 mm CL from the Beagle Channel (Golondrina Bay and Roca Mora, Argentina, were examined by the frequency of occurrence method of analysis and by a food index. Roca Mora is an area where juveniles ( 60 mm CL are common; in this last area sexual segregation was also observed. The principal food groups for crabs of Golondrina Bay were algae, molluscs, crustaceans, bryozoans and foraminiferans; for crabs from Roca Mora the natural diet consisted of three major food groups: hydrozoans, echinoderms and foraminiferans. The relative frequency of different prey groups varied in relation to the size, season and sex. There were no significant differences in the quantity of food consumed by sexes in both areas. Generally small crabs ( 50 mm CL. Juveniles consumed a greater amount of food during winter and spring. In summer (moulting period, juveniles had the highest vacuity index. Adults consumed minor amounts of food during autumn, before the spawning-moulting-mating period when the vacuity index was higher (spring.

  8. Validation and uncertainty quantification of Fuego simulations of calorimeter heating in a wind-driven hydrocarbon pool fire.

    Energy Technology Data Exchange (ETDEWEB)

    Domino, Stefan Paul; Figueroa, Victor G.; Romero, Vicente Jose; Glaze, David Jason; Sherman, Martin P.; Luketa-Hanlin, Anay Josephine

    2009-12-01

    The objective of this work is to perform an uncertainty quantification (UQ) and model validation analysis of simulations of tests in the cross-wind test facility (XTF) at Sandia National Laboratories. In these tests, a calorimeter was subjected to a fire and the thermal response was measured via thermocouples. The UQ and validation analysis pertains to the experimental and predicted thermal response of the calorimeter. The calculations were performed using Sierra/Fuego/Syrinx/Calore, an Advanced Simulation and Computing (ASC) code capable of predicting object thermal response to a fire environment. Based on the validation results at eight diversely representative TC locations on the calorimeter the predicted calorimeter temperatures effectively bound the experimental temperatures. This post-validates Sandia's first integrated use of fire modeling with thermal response modeling and associated uncertainty estimates in an abnormal-thermal QMU analysis.

  9. Aprendizajes del Accidente de San Juan Ixhuatepec-México Learning from the Accident in San Juan Ixhuatepec-Mexico

    OpenAIRE

    Antioco López-Molina; Richart Vázquez-Román; Christian Díaz-Ovalle

    2012-01-01

    El índice Dow de fuego y explosión y la metodología del análisis cuantitativo del riesgo son aplicados para analizar uno de los accidentes más desafortunados en la historia mexicana: la explosión de tanques de almacenamiento de gas en la planta de San Juan Ixhuatepec en México. Estimaciones adicionales de la sobrepresión y radiación térmica producida durante el siniestro son llevadas a cabo para explicar el efecto dominó producido como consecuencia del incidente. Estas estimaciones dan eviden...

  10. Alpine ecosystems

    Science.gov (United States)

    P.W. Rundel; C.I. Millar

    2016-01-01

    Alpine ecosystems are typically defined as those areas occurring above treeline, while recognizing that alpine ecosystems at a local scale may be found below this boundary for reasons including geology, geomorphology, and microclimate. The lower limit of the alpine ecosystems, the climatic treeline, varies with latitude across California, ranging from about 3500 m in...

  11. Ecosystem Jenga!

    Science.gov (United States)

    Umphlett, Natalie; Brosius, Tierney; Laungani, Ramesh; Rousseau, Joe; Leslie-Pelecky, Diandra L.

    2009-01-01

    To give students a tangible model of an ecosystem and have them experience what could happen if a component of that ecosystem were removed; the authors developed a hands-on, inquiry-based activity that visually demonstrates the concept of a delicately balanced ecosystem through a modification of the popular game Jenga. This activity can be…

  12. Atención a pacientes con heridas maxilofaciales producidas por armas de fuego Care of patients presenting with maxillofacial wounds by firearms

    Directory of Open Access Journals (Sweden)

    Juan Carlos Quintana Díaz

    2010-06-01

    Full Text Available INTRODUCCIÓN. Los traumatismos y fracturas maxilofaciales ocasionan deformidades difíciles de ocultar por ser la cara la porción más visible del cuerpo. Este trabajo tuvo como objetivo documentar la atención a un grupo de pacientes con heridas maxilofaciales producidas por arma de fuego, que fueron atendidos por la brigada médica cubana del Hospital Al-Waheda de Maabar (República de Yemen. MÉTODOS. Se analizó un grupo de 9 pacientes con heridas maxilofaciales, atendidos en el Hospital Al-Waheda de Maabar, perteneciente a la Universidad de Thamar (Yemen, entre los años 2006 y 2008. Se recogieron los datos siguientes: nombre y apellidos edad, sexo, lesión principal, lesiones asociadas y tipo de tratamiento, así como la evolución de los pacientes. El método estadístico empleado fue el cálculo porcentual. RESULTADOS. Entre las principales lesiones tratadas se encontraron las fracturas mandibulares, nasales y dentoalveolares, para cuyo tratamiento se siguieron las normas de los protocolos establecidos para la atención de este tipo de afección. Los resultados fueron excelentes en todos los pacientes y hubo una rápida recuperación en todos los casos. Se obtuvieron muy buenos resultados estéticos y funcionales. CONCLUSIONES. Al comparar el estado preoperatorio y posoperatorio de los pacientes, se demostró la importancia de la atención integral del equipo de profesores cubanos.INTRODUCTION. Traumatisms and maxillofacial fractures cause deformities difficult to hide because of the face of the more visible portion of the body. The aim of present paper is to document the care to group of patients presenting with maxillofacial wounds caused by firearms, treated by the Cuban medical brigade of Thamar University Al-Waheda Hospital of Maabar (Republic of Yemen. METHODS. A group of 9 patients presenting with maxillofacial wounds caused by firearms treated in above mentioned hospital between 2006 and 2008. Following data were collected

  13. Participation of CIEMAT in studies of radioecology in european marine ecosystems; Participacion del Ciemat en estudios de radioecologia en ecosistemas marinos Europeos

    Energy Technology Data Exchange (ETDEWEB)

    Gasco, C.; Meral, J.; Gonzalez, A. M. [Ciemat. Madrid (Spain)

    1999-07-01

    In this report the different objectives and results achieved through the participation of the Aquatic Radioecology Laboratory for CIEMAT in some European Projects from 1994 up to now are detailed. A Description of the studied ecosystems, the sampling campaigns performed, and the analytical methods developed are presented as well. Finally the main results and conclusions obtained are summarized. (Author)

  14. Memorias del tercer simposio internacional sobre economía, planificación, y políticas de los incendios forestales: problemas y enfoques comunes

    Science.gov (United States)

    Armando González-Cabán

    2009-01-01

    Estas memorias resumen el resultado de un simposio diseñado para discutir los problemas actuales que confrontan las agencias con responsabilidad para la proteccion contra incendios forestales a nivel federal y estadual en los EE.UU., al igual que agencias en la comunidad internacional. Los temas discutidos en el simposio incluyen economía del fuego, teoría y modelos...

  15. Contenido de carbono en un ecosistema semiárido del centro de México / Carbon content in a semi-arid ecosystem in central Mexico

    Directory of Open Access Journals (Sweden)

    Rocio Becerril-Piña

    2014-01-01

    Full Text Available En las últimas décadas se han propuesto diversas ecuaciones alométricas (EA para especies tropicales y subtropicales a fin de estimar el contenido de carbono (CC en la biomasa aérea, sin embargo, los ecosistemas semiáridos han sido poco estudiados a pesar de constituir cerca del 40 % de la superficie de México. El objetivo de este estudio fue desarrollar EA para determinar el CC en la biomasa aérea en mezquite (Prosopis laevigata, huizache (Acacia farnesiana y herbáceas representativas de una región semiárida del centro del país. Se seleccionaron y muestrearon por método destructivo cinco individuos de cada especie para estimar biomasa seca total y por componente (hojas, ramas y fuste, los cuales se correlacionaron con parámetros de fácil medición en campo: cobertura de la copa, radio de la copa, altura total y volumen, encontrándose valores de R2 entre 0.96 y 0.80 dependiendo de la especie. Mediante información satelital se estimó la distribución espacial del CC en la Cuenca Dolores Hidalgo (Guanajuato, localizada en la región semiárida del centro de México. La cobertura vegetal del área de estudio se reclasificó en tres tipos: abierta, semiabierta y cerrada. El contenido de carbono en la cobertura abierta fue de 2.4 Mg C ha-1, semiabierta 10.26 Mg C ha-1 y cerrada de 21.20 Mg C ha-1. Los resultados sugieren que los ecosistemas semiáridos de la zona central de México representan un potencial considerable como sumideros de carbono con un promedio de 11 Mg C ha-1.

  16. Long-term behaviour of {sup 137}Cs in the lacustrine ecosystem of lake Viverone; Il comportamento a lungo termine del {sup 137}Cs nell`ecosistema lacustre del lago di Viverone

    Energy Technology Data Exchange (ETDEWEB)

    Spezzano, P.; Cerea, E.; Massironi, L.; Olivetta, A.; Bortoluzzi, S.; Nocente, M.; Berton, G. [ENEA, Centro Ricerche Saluggia, Vercelli (Italy). Dip. Ambiente

    1998-12-31

    For the evaluation of long term behaviour of {sup 137}Cs in a lacustrine ecosystem, for ten years after the Chernobyl nuclear accident several experimental studies have been conducted in the Viverone lake, a small, eutrophic, monomictic lake situated between Turin and Vercelli, in North-West Italy. Radiocaesium activities were measured in different components of the ecosystem, i.e. soil, water, sediment and biotas, and have been related with main environmental physico-chemical parameters. Changes in radiocaesium content with time provided information about transfer processes of this radionuclide into the lacustrine ecosystem. Levels of {sup 137}Cs in lake water after several years from deposition can be ascribed to the migration from catchment basin and to the remobilization from bottom sediments. However, experimental results do not allow to ascertain which of these two factors prevails over the other.

  17. Entrepreneurial Ecosystems

    NARCIS (Netherlands)

    Stam, F.C.; Spigel, Ben

    2016-01-01

    This paper reviews and discusses the emergent entrepreneurial ecosystem approach. Entrepreneurial ecosystems are defined as a set of interdependent actors and factors coordinated in such a way that they enable productive entrepreneurship within a particular territory. The purpose of this paper is to

  18. Impacts of global change on iberian forest ecosystems inferred from the spanish national forest inventory = Impactos del cambio global en ecosistemas forestales ibéricos a partir del inventario forestal nacional

    OpenAIRE

    Hernández Mateo, Laura

    2015-01-01

    Los efectos del cambio global sobre los bosques son una de las grandes preocupaciones de la sociedad del siglo XXI. Algunas de sus posibles consecuencias como son los efectos en la producción, la sostenibilidad, la pérdida de biodiversidad o cambios en la distribución y ensamblaje de especies forestales pueden tener grandes repercusiones sociales, ecológicas y económicas. La detección y seguimiento de estos efectos constituyen uno de los retos a los que se enfrentan en la actualidad científic...

  19. Validation predictions of a 13 m/s cross-wind fire for Fuego and the University of Waterloo dataset.

    Energy Technology Data Exchange (ETDEWEB)

    Brown, Alexander L.; Evans, Gregory Herbert (Sandia National Laboratories, Livermore, CA); Gill, Walter; Jarboe, Daniel T. (Sandia National Laboratories, Livermore, CA)

    2008-03-01

    Detailed herein are the results of a validation comparison. The experiment involved a 2 meter diameter liquid pool of Jet-A fuel in a 13 m/s crosswind. The scenario included a large cylindrical blocking object just down-stream of the fire. It also included seven smaller calorimeters and extensive instrumentation. The experiments were simulated with Fuego. The model included several conduction regions to model the response of the calorimeters, the floor, and the large cylindrical blocking object. A blind comparison was used to compare the simulation predictions with the experimental data. The more upstream data compared very well with the simulation predictions. The more downstream data did not compare very well with the simulation predictions. Further investigation suggests that features omitted from the original model contributed to the discrepancies. Observations are made with respect to the scenario that are aimed at helping an analyst approach a comparable problem in a way that may help improve the potential for quantitative accuracy.

  20. Análisis de la repelencia al agua en una pequeña cuenca hidrográfica afectada por fuego controlado en el área montañosa central de Portugal

    Directory of Open Access Journals (Sweden)

    Ceballos, A.

    1999-12-01

    Full Text Available In this work it is described and analyzed the water repellency observed in a small catchment subject to prescribed burning and located in mountainous central part of Portugal. As well, a discussion about the methodologies usually used to measure the soil hydrophobocity, the replicability between field and laboratory data is established. The results show the little influence in soil physical parameters and organic matter content of prescribed burning and indicate a close relationship between spatial distribution of Erica sp. and water repellency. The replicability between soil hydrophobocity data from the field and laboratory is limited; nevertheless, a high level of correspondence exists between Molarity of an Ethanol Droplet and Water Drop Penetration Time data in the laboratory.

    [es] - En el presente trabajo se describe y analiza la repelencia al agua detectada en una pequeña cuenca hidrográfica afectada por fuego controlado en el área montañosa central de Portugal. También se establece una discusión acerca de los métodos utilizados para medir la hidrofobia y el grado de correspondencia entre los resultados obtenidos en el campo y en el laboratorio. Los resultados muestran la escasa influencia del fuego controlado sobre los parámetros físicos y contenido de materia orgánica del suelo, indicando, sin embargo, una estrecha relación entre la distribuci��n espacial de Erica sp. y suelos más hidrófobos. El grado de replicación entre la hidrofobia medida en el campo y en el laboratorio es discreto; no obstante, en el laboratorio sí se ha encontrado un buen nivel de correspondencia entre las dos técnicas utilizadas (Molarity of an Ethanol Droplet y Water Drop Penetration Time. [fr] Dans cet article est décrit puis analysé le phénomène de répulsion à l'eau qui a été observé dans un petit bassin hydrographique soumis au feu contrôlé dans la zone montagneuse centrale du Portugal. Une discussion est

  1. Cambios en las propiedades del suelo, posteriores a un incendio en el Parque Nacional Natural de Los Nevados, Colombia Soil changes after a fire event in a páramo ecosystem: Los Nevados Natural National Park, Colombia

    Directory of Open Access Journals (Sweden)

    Juan Carlos Camargo-García

    2012-04-01

    Full Text Available En 2006 ocurrió un incendio en el Parque Nacional Natural de Los Nevados, Colombia, que afectó aproximadamente 2400 ha de ecosistema de páramo de sectores aledaños a la laguna del Otún (4 ° 46' 58.4" N y 75° 24' 26.8" O. Teniendo en cuenta la posible afectación de algunos servicios ecosistémicos proveídos por el suelo y la necesidad de encontrar variables que puedan ser utilizadas como indicadores del estado de este recurso, se realizó una evaluación de las propiedades físicas y químicas de los suelos en áreas afectadas (AA y no afectadas (NA por el incendio. Las evaluaciones se tuvieron inmediatamente después del evento (2006, dos años (2008 y tres años (2009 después. Se incluyeron áreas donde se implementaron estrategias de restauración y dos posiciones en el relieve: valle (turberas y laderas. Para identificar diferencias en las características del suelo evaluadas entre sitios afectados y no-afectados, posiciones topográficas y los tratamientos de restauración, se hizo una prueba no-paramétrica de Kruskall-Wallis. Posteriormente, para verificar relaciones entre variables, se realizó un análisis de correlación usando el coeficiente de Sperman. En general, la posición de valle mostró los cambios más drásticos en el suelo a través del tiempo de evaluación. Allí, más del 50% de la materia orgánica se perdió, generando cambios también en algunas propiedades físicas como la densidad aparente y la estabilidad estructural, que después de tres años, y a pesar de las actividades de restauración, muestran evidentes problemas de degradación. Con los resultados obtenidos ha sido posible definir variables indicadoras de las condiciones del suelo, que podrían ser usadas en programas de monitoreo de este recurso. Así mismo, se evidencia que los procesos de restauración en este ecosistema son lentos y se requiere un tiempo prolongado para generar cambios positivos en las propiedades de los suelos afectados, que

  2. Ecosystem thermodynamics

    International Nuclear Information System (INIS)

    Gomez Palacio, German Rau

    1998-01-01

    Ecology is no more a descriptive and self-sufficient science. Many viewpoints are needed simultaneously to give a full coverage of such complex systems: ecosystems. These viewpoints come from physics, chemistry, and nuclear physics, without a new far from equilibrium thermodynamics and without new mathematical tools such as catastrophe theory, fractal theory, cybernetics and network theory, the development of ecosystem science would never have reached the point of today. Some ideas are presented about the importance that concept such as energy, entropy, exergy information and none equilibrium have in the analysis of processes taking place in ecosystems

  3. El mundo del libro: octubre de 1961

    Directory of Open Access Journals (Sweden)

    Agustín Rodríguez Garavito

    1961-10-01

    Full Text Available El documento presenta las reseñas de los siguientes títulos: Los orígenes del modernismo en Colombia -Por Rafael Maya. Biblioteca de Autores Contemporáneos. Niebla en la sierra -Por Manuel González Martínez AEDITA-Editores. Bogotá, D. E. Madrugada en la sangre. Meridiano de fuego y otros poemas. Por Emilio Rico - Imprenta Departamental de Ibagué. Mujeres de Colombia. Por Gloria Pachón Castro y Flor de Nhora. Catálogo general de la Biblioteca Luis Ángel Arango. Volumen I Comprende: 000 a 299 Ivo Andric -Premio Nobel de Literatura 1961. Papeletas bibliográficas para el estudio de la historia de Colombia -Por Maurio Germán Romero, Guillermo Hernández de Alba, Sergio Elías Ortíz.

  4. Urban ecosystem

    Energy Technology Data Exchange (ETDEWEB)

    Duvigneaud, P

    1974-01-01

    The author considers the town as an ecosystem. He examines its various subdivisions (climate, soil, structure, human and non-human communities, etc.) for which he chooses examples with particular reference to the city of Brussels.

  5. Caracterización de la situación posincendio en el área afectada por el incendio de 2005 en el Parque Nacional de Torres del Paine (Chile a partir de imágenes multiespectrales Characteristics of areas affected by fire in 2005 at Parque Nacional de Torres del Paine (Chile as assessed from multispectral images

    Directory of Open Access Journals (Sweden)

    RAFAEL M NAVARRO CERRILLO

    2008-03-01

    Full Text Available El uso de sensores remotos para la evaluación de la severidad es una de los aspectos más importantes en el estudio de grandes incendios, así como la aplicación de los resultados para el proceso de restauración. En este trabajo se ha estudiado la aplicación de imágenes de los sensores Landsat ETM+ y ASTER para evaluar la vegetación previa, la superficie recorrida por el fuego y los daños producidos por el incendio ocurrido en el año 2005 en el Parque Nacional de Torres del Paine (Chile. Los resultados obtenidos indican que el índice delta NBR es bastante versátil para evaluar la superficie afectada, estimada en este caso en 17.138 ha, así como la severidad de los daños (Fiabilidad = 81,5 %; k = 0,73. Por otro lado, se ha confirmado la adecuación del uso de imágenes Landsat ETM+ para mejorar la calidad de los mapas de vegetación previa a la ocurrencia del fuego (Fiabilidad = 79,5 %; k = 0,75. La combinación de esta información se ha podido aplicar para apoyar la restauración del área afectada por el incendio. Sin embargo, los resultados también han mostrado algunas limitaciones de los sensores, en particular en la definición de ecosistemas con representaciones superficiales pequeñas y/o fragmentadas, lo cual sugiere que el uso de sensores de mayor resolución espacial puede mejorar los productos cartográficos finales y, por tanto, la calidad de los trabajos de restauraciónThe use of remote sensors is one of the most important aspects in the study of large fires for an assessment of their severity, as well as the application of the results to the restoration process. This work has studied the application of images from the Landsat ETM + ASTER sensors in order to evaluate the prior vegetation, the surface burned and the damage caused by a fire occurring in 2005 in the National Park of Torres del Paine (Chile. The results obtained indicate that the delta NBR index is reasonably versatile for evaluating the affected surface

  6. Strategic ecosystems of Colombia

    International Nuclear Information System (INIS)

    Marquez Calle German

    2002-01-01

    The author relates the ecosystems in Colombia, he makes a relationship between ecosystems and population, utility of the ecosystems, transformation of the ecosystems and poverty and he shows a methodology of identification of strategic ecosystems

  7. Transferencia de recursos alimentarios entre diferentes ambientes del ecosistema marino Transfer of food resources among different environments in the marine ecosystem

    Directory of Open Access Journals (Sweden)

    SEBASTIAN R. RODRIGUEZ

    2000-03-01

    Full Text Available Por décadas los ecólogos han centrado sus estudios en interacciones que involucran elementos de un mismo sistema, poniendo poco énfasis en aquellas que involucran elementos de ambientes aledaños. Estudios desarrollados en los últimos años han vuelto a llamar la atención respecto de la frecuencia con la que ocurre transferencia de energía (en la forma de nutrientes o alimento entre sistemas, ambientes y/o hábitats ecológicos, y las consecuencias de estos aportes energéticos a nivel poblacional o comunitario a distintas escalas espaciales y temporales en los sistemas involucrados. En la presente revisión se describen las vías de transferencia de energía más comunes de observar en el ecosistema marino, poniendo especial énfasis en el flujo de recursos tróficos (i.e., algas a la deriva y detritus desde bosques de macroalgas pardas submareales hacia ambientes intermareales en los sistemas templadosFor decades ecologists have focused their studies in interactions among elements of the same system, putting low emphasis in those that involve elements of border environments. Studies carried out in the last years have called the attention respect the frequent ocurrence of energy transfer (as nutrients or food among ecological systems, environments and/or habitats, and the consequences of these energy contributions at population or community levels and at different spatial and temporal scales. In this review the ways of energy transfer more commonly observed in the marine ecosystem are described. The flow of trophic resources (i.e., drift algae and detritus from subtidal kelps to intertidal environments in template systems, are emphasized

  8. La ciudad como laberinto psicótico en El padre mío y Jamás el fuego nunca de Diamela Eltit

    Directory of Open Access Journals (Sweden)

    Eugenia Brito Astrosa

    2015-05-01

    Full Text Available El presente artículo explora las relaciones entre psicosis y normalidad en dos textos escritos por Diamela Eltit, El Padre Mío y Jamás el Fuego Nunca , libros cuya construcción laberíntica espacial y lingüística expresa, de manera barroca, el terror y la violencia como efectos políticos deseados por la tiranía de la dictadura militar instalada en Chile desde 1973 hasta 1989, efectos no reparados durante la posdictadura y cuyas huellas se expanden por el cuerpo de la ciudadanía, a través de la enfermedad, la locura y la muerte. The present article explores relationships between psychosis and normality in two texts written by Diamela Eltit, El Padre Mío and Jamás el Fuego Nunca, are books which, through their spacially and linguistically labyrinthine constructions, express, with a baroque way, terror and violence as the political effects sought after by the military dictatorship installed in Chile from 1973 until 1989; effects never repaired during the post-dictatorship period and which have left a mortal imprint that expands through the body of the citizenship, through sickness, insanity, and death.

  9. Designer ecosystems

    NARCIS (Netherlands)

    Awasthi, Ashutosh; Singh, Kripal; O'Grady, Audrey; Courtney, Ronan; Kalra, Alok; Singh, Rana Pratap; Cerda Bolinches, Artemio; Steinberger, Yosef; Patra, D.D.

    2016-01-01

    Increase in human population is accelerating the rate of land use change, biodiversity loss and habitat degradation, triggering a serious threat to life supporting ecosystem services. Existing strategies for biological conservation remain insufficient to achieve a sustainable human-nature

  10. Memorias del segundo simposio internacional sobre políticas, planificación y economía de los programas de protección contra incendios forestales: una visión global; 2004 Abril 19–22; Córdoba, España

    Science.gov (United States)

    Armando González-Cabán

    2008-01-01

    Estas memorias resumen el resultado de un simposio diseñado para discutir los problemas actuales que confrontan las agencias con responsabilidad para la protección contra incendios forestales a nivel federal y estadual en los EE.UU., al igual que agencias en la comunidad internacional. Los temas discutidos en el simposio incluyen economía del fuego, teoría y modelos...

  11. Inconsistencias contaminantes: gobernación electoral y conflicto poselectoral en las elecciones presidenciales del 2006 en México

    OpenAIRE

    Andreas SCHEDLER

    2009-01-01

    RESUMEN: Cuando partidos o candidatos derrotados rechazan el resultado de una elección, casi invariablemente aseveran haber sido víctimas de fraude. La democracia les exige aceptar su derrota, el fraude los libera de esta exigencia. En muchos casos, es difícil para ciudadanos y observadores evaluar la veracidad de sus acusaciones. Como argumenta el presente ensayo, la presencia de inconsistencias en el ámbito de la gobernación electoral tiende a alimentar el fuego del conflicto poselectoral d...

  12. Vigilancia del riesgo de ocurrencia de incendios forestales mediante estaciones meteorológicas de superficie

    Directory of Open Access Journals (Sweden)

    I. M. Domínguez-Hurtado

    2008-01-01

    Full Text Available Para la estimación del riesgo de ocurrencia de incendios forestales se emplean diferentes variantes a nivel mundial, en este trabajo se propone un sistema de vigilancia para la detección del riesgo de ocurrencia de incendios forestales a partir de la información procedente de estaciones meteorológicas de superficie, debido básicamente a la carencia de salidas operativas diarias que evaluarán las condiciones de riesgo de fuegos a nivel nacional. Se emplearon los índices de Nesterov modificado y Monte Alegre, los cuales se estimaron a partir de los datos procedentes de las 68 estaciones meteorológicas de Cuba. A partir de dicha información se obtiene la salida mapificada diaria de cada uno de ellos, mediante la utilización de la técnica de interpolación bicubic spline. Se obtuvo un sistema operativo totalmente automatizado para la evaluación de las condiciones de riesgo de ocurrencia de incendios para Cuba, el cual brinda la posibilidad de completar y perfeccionar el sistema de vigilancia de fuegos, basado en la reducción de la escala temporal y el tratamiento de la información.

  13. Alteraciones por el fuego en la Cordillera de la Costa de Chile mediterráneo. Antecedentes en un parque nacional

    Directory of Open Access Journals (Sweden)

    Quintanilla Pérez, Víctor

    1996-12-01

    Full Text Available The Cerro de la Campana range, in the central part of Chile, is described. The area has several important features, and parts of it have been declared as National Park. Besides the high taxonomic and ecology diversity, both in animals and in plants, it has the southernmost forests of palm trees, as well as many other subtropical residual forests. Many species reach here the extreme south limit. But the ecosystems of the area are endangered and most of them have been decreasing or even vanishing in the past because of the human pressure. The main dangers come from fire and from slash cutting, although many natural communities there seem to be adapted to periodic burns. The consequences of these dangers and some protective measures are discussed.

    Se describe la cadena del Cerro de la Campana, cuyos recursos naturales han determinado la creación en la zona de un Parque Nacional. Los aspectos más interesantes de la zona se relacionan con la existencia en la misma de bosques subtropicales relictos, así como de bosquetes de palmeras en los que la familia palmáceas alcanza su límite extremo meridional. Por otra parte, la variedad ecológica del área es muy elevada, al igual que su riqueza específica, puesto que alberga 7tiuverosas especies de vertebrados, invertebrados y plantas. Muchas especies encuentran aquí su límite meridional absoluto. Sin embargo la zona se encuentra amenazada por la presión humana, especialmente en la forma de incendios forestales y tala masiva, a pesar de que muchas comunidades naturales parecen estar adaptadas a los incendios repetidos. En el trabajo se analizan las consecuencias de estas amenazas y se sugieren medidas encaminadas a la protección del paraje.

  14. Evaluación del estrato arbóreo en un área restaurada post-incendio en el parque ecológico Chipinque, México

    Directory of Open Access Journals (Sweden)

    E. Alanís-Rodríguez

    2008-01-01

    prácticas de restauración ejercidos en estas áreas modifican la diversidad y abundancia de las especies arbóreas y arbustivas presentes. Se registró un total de 11 especies arbóreas y arbustivas pertenecientes a siete familias, siendo la más importante la Fagaceae, con cuatro especies (Quercus rysophylla, Q. canbyi, Q. laeta y Q. laceyi, ya que este grupo se ve favorecido con los incendios forestales superficiales, debido a la capacidad de rebrote que es estimulado ante los efectos del aumento de la temperatura del suelo causada por el fuego.

  15. Desclasificando las huellas presentes de un pasado violento : La producción documental de la UNLP desde la organización del Estado terrorista (1976-1983) hasta la normalización de la universidad (1986)

    OpenAIRE

    Casareto, Laura Mariana

    2017-01-01

    De las interrupciones de la vida democrática que sufrió nuestro país, la última dictadura marcó a fuego la vida de las universidades, el autodenominado Proceso de Reorganización Nacional (PRN). En el ámbito universitario, unos días después del golpe de 1976, se dictó la ley 21.276 que puso a las Casas de Altos Estudios bajo la órbita del Poder Ejecutivo Nacional, el cual designó a interventores militares en dichas instituciones. En la universidad platense, el Teniente de Fragata Eduardo Sacco...

  16. La transformación del ecosistema mediático español: el caso de eldiario.es / The transformation of the Spanish media ecosystem: the case of eldiario.es

    Directory of Open Access Journals (Sweden)

    José Luis González Esteban

    2014-12-01

    Full Text Available El ecosistema mediático español se está transformando a ritmo vertiginoso, de manera similar a la política nacional y con muchas claves coincidentes como la participación ciudadana. Tras unos años de experimentación en torno a contenidos, organización y sobre todo modelos de negocio de los nuevos medios, en España se están consolidando proyectos de sumo interés. Uno de ellos es eldiario.es, medio nativo digital encabezado por el periodista Ignacio Escolar que se ha colocado entre los medios más influyentes del país, entre los más visitados en Internet, y ello gracias a un periodismo de calidad especializado en contenidos de política nacional, aderezados con un toque social. En el presente artículo se analiza la evolución de los medios nativos digitales en España durante el último lustro, poniendo el foco en el caso aludido por la originalidad de su modelo de negocio y por el impacto de sus contenidos de actualidad política. Abstract The Spanish media ecosystem is becoming a crazy pace, similar to the national policy and with many matching keys as citizen participation. After years of experimentation around content, organization, and especially business models of new media in Spain are consolidating projects of great interest. One is eldiario.es, digital native environment led by journalist Ignacio Escolar has been placed among the most influential media in the country, among the most visited on the Internet, thanks to quality journalism specializing in content of national policy seasoned with a social twist. In this paper the evolution of digital natives in Spain media is analyzed during the last five years, putting the focus on the case mentioned by the originality of its business model and the impact of current affairs content.

  17. Astronomical Ecosystems

    Science.gov (United States)

    Neuenschwander, D. E.; Finkenbinder, L. R.

    2004-05-01

    Just as quetzals and jaguars require specific ecological habitats to survive, so too must planets occupy a tightly constrained astronomical habitat to support life as we know it. With this theme in mind we relate the transferable features of our elementary astronomy course, "The Astronomical Basis of Life on Earth." Over the last five years, in a team-taught course that features a spring break field trip to Costa Rica, we have introduced astronomy through "astronomical ecosystems," emphasizing astronomical constraints on the prospects for life on Earth. Life requires energy, chemical elements, and long timescales, and we emphasize how cosmological, astrophysical, and geological realities, through stabilities and catastrophes, create and eliminate niches for biological life. The linkage between astronomy and biology gets immediate and personal: for example, studies in solar energy production are followed by hikes in the forest to examine the light-gathering strategies of photosynthetic organisms; a lesson on tides is conducted while standing up to our necks in one on a Pacific beach. Further linkages between astronomy and the human timescale concerns of biological diversity, cultural diversity, and environmental sustainability are natural and direct. Our experience of teaching "astronomy as habitat" strongly influences our "Astronomy 101" course in Oklahoma as well. This "inverted astrobiology" seems to transform our student's outlook, from the universe being something "out there" into something "we're in!" We thank the SNU Science Alumni support group "The Catalysts," and the SNU Quetzal Education and Research Center, San Gerardo de Dota, Costa Rica, for their support.

  18. Smoky indoor cooking fires are associated with elevated hemoglobin concentration in iron-deficient women Asocian el fuego con humo para cocinar dentro de la vivienda con concentraciones elevadas de hemoglobina en mujeres con deficiencia de hierro

    Directory of Open Access Journals (Sweden)

    Lynnette M. Neufeld

    2004-02-01

    combustión de materiales bioorgánicos utilizados como combustible, tales como la madera y los desechos agrícolas, está asociada con un mayor riesgo de padecer problemas respiratorios. Su efecto sobre otros aspectos de la salud, como el crecimiento fetal, no ha sido aún documentado adecuadamente. El objetivo del presente estudio, realizado en mujeres que utilizan combustible bioorgánico para cocinar en el interior de sus viviendas, fue determinar si el empleo de fuego "con humo" se asocia con una mayor concentración de hemoglobina en comparación con el uso de fogones "sin humo," es decir, cocinas diseñadas para reducir el nivel de contaminación del aire en el interior de las viviendas. Esta investigación es parte de una serie de estudios preliminares realizados para determinar la factibilidad y los posibles beneficios para la salud de una intervención aleatorizada dirigida a las cocinas, con el fin de reducir la contaminación del aire doméstico provocada por el empleo de combustibles bioorgánicos para cocinar. MÉTODOS: Entre marzo y agosto de 1994 se realizó un estudio observacional transversal en mujeres indígenas que utilizaban combustible bioorgánico y cocinaban en el interior de sus viviendas en comunidades rurales de las zonas montañosas de Guatemala. Se estudió a 89 mujeres que empleaban fogones sin humo (grupo no expuesto y 185 mujeres de las mismas comunidades que empleaban fogones que generaban humo (grupo expuesto. Ninguna estaba embarazada. Se tomaron muestras de sangre venosa y se determinaron las concentraciones de hemoglobina y de ferritina. Mediante análisis de regresión lineal múltiple se investigó la relación entre la exposición (fogones sin humo o fogones con humo y la concentración de hemoglobina, y se hicieron ajustes por posibles factores de confusión. RESULTADOS: No se encontró que la exposición al factor estudiado (fogones sin humo o con humo tuviera algún efecto en la concentración de hemoglobina, ya fuera mediante an

  19. ANALIZANDO LA VARIABILIDAD DEL REGISTRO ARQUEOLÓGICO EN SOCIEDADES CAZADORAS-RECOLECTORAS DESDE LA ETNOARQUEOLOGÍA (Analyzing Archaeological Record Variability in Hunter-Gatherers Societies from Ethnoarchaeology

    Directory of Open Access Journals (Sweden)

    Assumpció Vila Mitjà

    2009-03-01

    Full Text Available Desde 1986, nuestros proyectos de investigación (en colaboración con una contraparte argentina en la Isla Grande de Tierra del Fuego han tenido como objetivo destacado el desarrollo de una metodología para un adecuado reconocimiento de la organización social a partir de la evidencia arqueológica. El trabajo aquí presentado se concentra en uno de los asentamientos excavados durante estos proyectos, Túnel VII, ubicado en la parte argentina de la Isla Grande de Tierra del Fuego. El yacimiento, un «conchero», es altamente representativo de las sociedades canoeras de los canales fueguinos, al menos en su fase final. El método de excavación nos ha permitido reconocer la detallada secuencia de una serie de, al menos, diez episodios discretos de ocupación a lo largo de un siglo, que tuvieron lugar en la práctica totalidad de las estaciones del año. Los momentos de ocupación de Túnel VII no llevan vinculadas específicas pautas estacionales. Son estrategias de subsistencia especializadas pero «flexibles» que no se ven representadas en la estructura conceptual dual «collector» o «forager», es decir, una «especialización en la no especialización». La misma evidencia ha servido para fijar claros y definitorios comportamientos generales respecto al uso del espacio. ENGLISH: From 1986, our research projects in Isla Grande of Tierra del Fuego, in collaboration with other Argentinian team, have emphasized the goal of developing a methodology for a proper archaeological recognition of the social organization from archaeological evidence. The work presented here focuses on one of the settlements excavated during these projects, VII Tunnel, located on the Argentine side of the Isla Grande of Tierra del Fuego. The site is highly representative of the canoe societies of the fueguian channels, at least in its final phase. The excavation method allow us to recognize the detailed sequence of a series of at least ten discrete episodes of

  20. ¿Echando leña al fuego? Análisis institucionalista de la dinámica del dinero y el crédito

    Directory of Open Access Journals (Sweden)

    Javier Arribas Cámara

    2017-01-01

    Full Text Available En este trabajo se analiza la evolución de la relación entre la masa monetaria y el crédito bancario, con objeto de observar si existe una relación entre masa monetaria y crédito bancario. Esta relación ha sido establecida por la interpretación institucionalista mediante la hipótesis “echando leña al fuego” (fueling the flames propuesta en el modelo Kindleberger-Minsky, en la teoría de la endogeneidad monetaria. Con el objeto de identificar las relaciones causales predominantes se estima la prueba de no-Causalidad de Granger en una aproximación a Estados Unidos, Alemania y España entre 1960-2008.

  1. La cara oculta del TDAH

    Directory of Open Access Journals (Sweden)

    Carlos Ramos Galarza

    2016-05-01

    Full Text Available El trastorno por déficit de atención con hiperactividad (TDAH es el principal diagnóstico psiquiátrico que reciben niños y adolescentes. Poco se ha relatado sobre los significados que se construyen alrededor de un individuo que recibe esta categoría diagnóstica, siendo la principal construcción social en torno a este trastorno, el de concebir a la persona que lo padece como un ser que posee una mente enferma, la cual debe ser medicada para enrumbarse en los estándares cognitivos y comportamentales establecidos desde la cultura, la ciencia, lo social, en fin, desde lo inventado por los humanos. En el presente artículo se juega a poner las manos en el fuego, para describir y analizar, desde un paradigma crítico, las prácticas ocultas que se construyen en lo implícito del diagnóstico del TDAH. La metodología seguida en este estudio fue la revisión de artículos indexados en las bases de datos Latindex, Scopus y Web of Science desde el 2001 hasta el 2014. Los términos de búsqueda utilizados fueron construcción del TDAH, narrativa construida en el TDAH, significados que emergen en el TDAH, e investigación cualitativa en el TDAH, tanto en español como en inglés. La principal conclusión que emerge en el presente análisis es la invitación a reflexionar sobre el papel que jugamos los actores envueltos en la práctica de la salud mental infantil, en donde un diagnóstico psicopatológico puede influir de forma descomunal en la construcción de la identidad del ser humano, en especial de quienes pueden cumplir la sintomatología asociada al TDAH.

  2. Measuring Entrepreneurial Ecosystems

    OpenAIRE

    Stam, F.C.

    2017-01-01

    How can entrepreneurial ecosystems and productive entrepreneurship can be traced empirically and how is entrepreneurship related to entrepreneurial ecosystems. The analyses in this chapter show the value of taking a systems view on the context of entrepreneurship. We measure entrepreneurial ecosystem elements and use these to compose an entrepreneurial ecosystem index. Next, we measure the output of entrepreneurial ecosystems with different indicators of high-growth firms. We use the 12 provi...

  3. Mapping Ecosystem Services

    OpenAIRE

    Georgiev,Teodor; Burkhard,Benjamin; Maes,Joachim

    2017-01-01

    Ecosystem services are the contributions of ecosystem structure and function (in combination with other inputs) to human well-being. That means, humankind is strongly dependent on well-functioning ecosystems and natural capital that are the base for a constant flow of ecosystem services from nature to society. Therefore ecosystem services have the potential to become a major tool for policy and decision making on global, national, regional and local scales. Possible applications are manifold:...

  4. Transformation of Digital Ecosystems

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Hedman, Jonas

    2014-01-01

    the Digital Ecosystem Technology Transformation (DETT) framework for explaining technology-based transformation of digital ecosystems by integrating theories of business and technology ecosystems. The framework depicts ecosystem transformation as distributed and emergent from micro-, meso-, and macro- level......In digital ecosystems, the fusion relation between business and technology means that the decision of technical compatibility of the offering is also the decision of how to position the firm relative to the coopetive relations that characterize business ecosystems. In this article we develop...... coopetition. The DETT framework consists an alternative to the existing explanations of digital ecosystem transformation as the rational management of one central actor balancing ecosystem tensions. We illustrate the use of the framework by a case study of transformation in the digital payment ecosystem...

  5. Ecosystem degradation in India

    International Nuclear Information System (INIS)

    Sinha, B.N.

    1990-01-01

    Environmental and ecosystem studies have assumed greater relevance in the last decade of the twentieth century than even before. The urban settlements are becoming over-crowded and industries are increasingly polluting the air, water and sound in our larger metropolises. Degradation of different types of ecosystem are discussed in this book, Ecosystem Degradation in India. The book has been divided into seven chapters: Introduction, Coastal and Delta Ecosystem, River Basin Ecosystem, Mountain Ecosystem, Forest Ecosystem, Urban Ecosystem and the last chapter deals with the Environmental Problems and Planning. In the introduction the environmental and ecosystem degradation problems in India is highlighted as a whole while in other chapters mostly case studies by experts who know their respective terrain very intimately are included. The case study papers cover most part of India and deal with local problems, stretching from east coast to west coast and from Kashmir to Kanyakumari. (author)

  6. Estudio preliminar del desarrollo muscular y su posible funcionalidad en una población cazadora fueguina

    Directory of Open Access Journals (Sweden)

    Kozameh, Livia Febes

    2001-01-01

    Full Text Available En una primera etapa, este estudio propone analizar las fijaciones de ciertas inserciones musculares correspondientes a cinturas escapulares, brazos y antebrazos. El desarrollo de estas fijaciones, observado en restos óseos de una población cazadora, es tomado como indicador de algunos movimientos predominantes, los que sumados al tipo de esfuerzo muscular demandado podrían indicar distintas actividades cotidianas de estos pobladores. Los restos utilizados provienen de diversos sitios excavados durante la década del ´80 en Península Mitre, Isla Grande de Tierra del Fuego. El análisis osteológico se llevó a cabo mediante la observación macroscópica estructural y con lupa binocular. Se observó un marcado desarrollo en las diversas inserciones musculares analizadas, lo que sugeriría una gran demanda funcional de la estructura muscular de estos individuos.

  7. Measuring Entrepreneurial Ecosystems

    NARCIS (Netherlands)

    Stam, F.C.

    How can entrepreneurial ecosystems and productive entrepreneurship can be traced empirically and how is entrepreneurship related to entrepreneurial ecosystems. The analyses in this chapter show the value of taking a systems view on the context of entrepreneurship. We measure entrepreneurial

  8. Coral reefs - Specialized ecosystems

    Digital Repository Service at National Institute of Oceanography (India)

    Wafar, M.V.M.

    This paper discusses briefly some aspects that characterize and differentiate coral reef ecosystems from other tropical marine ecosystems. A brief account on the resources that are extractable from coral reefs, their susceptibility to natural...

  9. Ecosystem classification, Chapter 2

    Science.gov (United States)

    M.J. Robin-Abbott; L.H. Pardo

    2011-01-01

    The ecosystem classification in this report is based on the ecoregions developed through the Commission for Environmental Cooperation (CEC) for North America (CEC 1997). Only ecosystems that occur in the United States are included. CEC ecoregions are described, with slight modifications, below (CEC 1997) and shown in Figures 2.1 and 2.2. We chose this ecosystem...

  10. On Man and Ecosystems.

    Science.gov (United States)

    Brookfield, Harold

    1982-01-01

    Distinctions between natural ecosystems and human ecosystems are misleading. Natural and social sciences can be integrated through the concept of a "human-use ecosystem," in which social scientists analyze the community, household, and individual, and natural scientists analyze the land. Includes a case study of St. Kitts. (KC)

  11. Global Ecosystem Restoration Index

    DEFF Research Database (Denmark)

    Fernandez, Miguel; Garcia, Monica; Fernandez, Nestor

    2015-01-01

    The Global ecosystem restoration index (GERI) is a composite index that integrates structural and functional aspects of the ecosystem restoration process. These elements are evaluated through a window that looks into a baseline for degraded ecosystems with the objective to assess restoration...

  12. Towards ecosystem accounting

    NARCIS (Netherlands)

    Duku, C.; Rathjens, H.; Zwart, S.J.; Hein, L.

    2015-01-01

    Ecosystem accounting is an emerging field that aims to provide a consistent approach to analysing environment-economy interactions. One of the specific features of ecosystem accounting is the distinction between the capacity and the flow of ecosystem services. Ecohydrological modelling to support

  13. Rights to ecosystem services

    NARCIS (Netherlands)

    Davidson, M.

    2014-01-01

    Ecosystem services are the benefits people obtain from ecosystems. Many of these services are provided outside the borders of the land where they are produced; this article investigates who is entitled to these non-excludable ecosystem services from two libertarian perspectives. Taking a

  14. Peces del Noroeste del Ecuador

    OpenAIRE

    Barriga, Ramiro

    1994-01-01

    La ictiofauna del occidente del Ecuador es poco conocida. Los peces del noroccidente son diferentes a los del suroccidente del Ecuador. 34 familias y 82 especies fueron colectadas que equivale al 11 % de las especies de peces continentales registradas en el Ecuador. Icteogeográficamente se sabe que la costa ecuatoriana posee dos provincias: la del Pacifico Norte y la del Guayas, se determinó que el límite de las dos provincias es el río Santiago ya que las especies del mencionado río so...

  15. Establishment of Chinook salmon (Oncorhynchus tshawytscha in Pacific basins of southern South America and its potential ecosystem implications Establecimiento del salmón Chinook (Oncorhynchus tshawytscha en cuencas del Pacífico sur de Sudamérica y sus potenciales implicancias ecosistémicas

    Directory of Open Access Journals (Sweden)

    DORIS SOTO

    2007-03-01

    management tools and approaches to control the populations avoiding irreversible ecosystem disruptions and social conflictsLos salmonídeos no son nativos del hemisferio sur, y es así que las truchas (arcoiris y café se establecieron en el sur de Sudamérica hace un siglo. La mayoría de los intentos por introducir salmones anádromos falló hasta el establecimiento de la acuicultura en los años ochenta. A partir de 1990, aparentemente debido a escapes de Oncorhynchus tshawytscha (salmón Chinook de cultivo, se están produciendo retornos reproductivos de esta especie en cuencas chilenas y argentinas al sur de los 39º S. En este trabajo se muestra la ocurrencia histórica y espacial de salmón chinook en cuatro cuencas de vertiente Pacífica durante la última década. Nuestro objetivo es establecer el progreso de su establecimiento al tiempo que se proyectan algunos impactos así como alternativas de manejo. En Chile, el muestreo se realizó entre 1995 y 2005 incluyendo los ríos Petrohué, Poicas, Río Negro-Hornopirén, y el Lago Puyehue, en la X Región. En Argentina los ríos muestreados incluyen al Futaleufú, Carrenleufú y Pico. En las cuencas chilenas y argentinas los Chinook reproductivos alcanzaban 73 a 130 cm de largo total encontrándose los más pequeños en el Lago Puyehue donde la población estaría encerrada. En el Río Petrohué, los retornos variaron de año en año alcanzando máximos en 1996 y en el 2004 de hasta 500 kg de pescado en una extensión de 100 m de río. La distribución temporal de juveniles sugiere que principalmente se trata del tipo chinook oceánico ya que migrarían al mar durante el primer año de vida. Como se observa en Petrohué, poblaciones reproductivas de la especie aportarían cantidades relevantes de nutrientes de origen marino tal como ocurre en sus hábitats naturales, produciendo así una importante perturbación a los balances y ciclos naturales en estos sitios. El establecimiento de poblaciones de Chinook en el sur de

  16. Ecosystem approach to promoting appropriate antibiotic use for children in indigenous communities in Ecuador Enfoque ecosistémico de promoción del uso adecuado de antibióticos en niños de comunidades indígenas del Ecuador

    Directory of Open Access Journals (Sweden)

    Georgina Muñoz

    2011-12-01

    Full Text Available OBJECTIVE: To collect baseline data on infectious diseases and antibiotic use in two Andean indigenous communities in Ecuador in order to determine the feasibility and acceptability of applying an ecosystem approach to address associated problems. METHODS: In visits to 65 households with children under age 5 years, environmental risk factors for infectious diseases were evaluated through rapid assessment. Caregivers' knowledge, attitudes, and practices related to antibiotic use were determined through a knowledge, practices, and coverage survey; antibiotic use was gleaned from inspection of medicine chests; and overall health of the 91 children (including nutritional status was assessed. A workshop was held to share results and to craft a multicomponent intervention using an ecohealth framework. RESULTS: Numerous environmental risk factors were identified, especially related to water and sanitation. Knowledge, attitudes, and practices revealed use of traditional and Western medicines and serious knowledge gaps. Antibiotics were present in 60.9% of households in Correuco and 46.8% in La Posta; malnutrition rates were 22.2% in Correuco and 26.1% in La Posta; diarrheic episodes were experienced in the previous month by 26.7% of children in Correuco and 47.8% in La Posta, with antibiotics prescribed in 50.0% and 47.1% of cases, respectively; and acute respiratory infections were incurred by 28.9% of children in Correuco and 47.8% in La Posta, with antibiotics prescribed in 53.8% and 50.0% of cases, respectively. CONCLUSIONS: Environmental, social, and cultural factors must be addressed to prevent antibiotic resistance in addition to training health personnel. An ecosystem approach is well-suited for this goal.OBJETIVO: Recopilar datos iniciales sobre las enfermedades infecciosas y el uso de antibióticos en dos comunidades indígenas andinas del Ecuador, con el objeto de determinar la factibilidad y la aceptabilidad de aplicar un enfoque ecosist

  17. Las pruebas de significación estadística: seis décadas de fuegos artificiales

    Directory of Open Access Journals (Sweden)

    Luis C. Silva-Aycaguer

    2016-09-01

    Full Text Available Tras varios decenios de críticas a las técnicas inferenciales basadas en las pruebas de significación estadística orientadas al rechazo de la llamada hipótesis nula y, a pesar del notable consenso alcanzado entre los estadísticos profesionales, este recurso se mantiene vigente tanto en las publicaciones biomédicas, entre ellas las de Salud Pública, como en cursos introductorios de estadística. Entre las muchas deficiencias señaladas por los más prominentes especialistas se destacan tres por ser las más obvias y fáciles de comprender: que no contribuyen a cumplimentar la encomienda de la ciencia, que se conocen de antemano las respuestas a las preguntas que se encaran por su conducto y que los resultados que producen dependen de un elemento ajeno a la realidad estudiada: el tamaño muestral. El artículo discute en detalle tales limitaciones, ilustra su perniciosa presencia en la investigación actual y valora las razones para la subsistencia de la sinrazón en esta materia.

  18. Ecosystem services in ECOCLIM

    DEFF Research Database (Denmark)

    Sørensen, Lise Lotte; Boegh, Eva; Bendtsen, J

    that actions initiated to reduce anthropogenic GHG emissions are sustainable and not destructive to existing ecosystem services. Therefore it is important to address i.e. land use change in relation to the regulating services of the ecosystems, such as carbon sequestration and climate regulation. At present...... a thorough understanding of the ecosystem processes controlling the uptake or emissions of GHG is fundamental. Here we present ECOCLIM in the context of ecosystem services and the experimental studies within ECOCLIM which will lead to an enhanced understanding of Danish ecosystems....

  19. Fishing for ecosystem services.

    Science.gov (United States)

    Pope, Kevin L; Pegg, Mark A; Cole, Nicholas W; Siddons, Stephen F; Fedele, Alexis D; Harmon, Brian S; Ruskamp, Ryan L; Turner, Dylan R; Uerling, Caleb C

    2016-12-01

    Ecosystems are commonly exploited and manipulated to maximize certain human benefits. Such changes can degrade systems, leading to cascading negative effects that may be initially undetected, yet ultimately result in a reduction, or complete loss, of certain valuable ecosystem services. Ecosystem-based management is intended to maintain ecosystem quality and minimize the risk of irreversible change to natural assemblages of species and to ecosystem processes while obtaining and maintaining long-term socioeconomic benefits. We discuss policy decisions in fishery management related to commonly manipulated environments with a focus on influences to ecosystem services. By focusing on broader scales, managing for ecosystem services, and taking a more proactive approach, we expect sustainable, quality fisheries that are resilient to future disturbances. To that end, we contend that: (1) management always involves tradeoffs; (2) explicit management of fisheries for ecosystem services could facilitate a transition from reactive to proactive management; and (3) adaptive co-management is a process that could enhance management for ecosystem services. We propose adaptive co-management with an ecosystem service framework where actions are implemented within ecosystem boundaries, rather than political boundaries, through strong interjurisdictional relationships. Published by Elsevier Ltd.

  20. SIMPOSIO "ASPECTOS MÉDICOS DE LA ERUPCIÓN DEL NEVADO DEL RUIZ". CONCLUSIONES PRELIMINARES

    Directory of Open Access Journals (Sweden)

    Academia Nacional de Medicina

    1986-12-01

    Full Text Available

    El Comité Organizador del Simposio "' Aspéctos Medicos de la Erupción Volcanica del Nevado del Ruiz". confor­mado por los doctores Pablo Gomez Martinez, Jose Felix Patino, Valentin Malagón, German Fernandez. Ivan Munera y Luis Jorge Perez, se permite informar a la opinion publica, las conclusiones preliminares a las que ha llegado despues de haber analizado todas las ponencias presentadas por las personas y entidades que atendieron sobrevivientes de la catastrofe de noviembre de 1985.

    1. Aspectos geológicos

    Colombia está situada en el area denominada Cinturón de Fuego, que envuelve el Oceano Pacifico y en su conformación geográfica se encuentran 30 volcanes, situados en su mayorla en la Cordillera Central. De estos, 11 están en mayor o menor actividad y 7 tienen historia de erupciones. Las capas geol6ógicas sobre las cuales se extiende el pals presentan zonas de elevada sismicidad

    Las caracterlsticas de la erupción del Nevado del Ruiz permiten clasificarlo como un volcan de tipo "'Pliniano- explosivo". que puede emitir enorme cantidad de gases y fragmentos sólidos a grandes velocidades y altas tempe­raturas, como tambien lodo caliente, con deshielo de las nieves perpetuas cuyo resultado es Ia formación del "lahar" que sepultó las poblaciones y cubrió extensas zonas de terreno. Estas erupciones se presentan de manera intermitente y su comportamiento es impredecible. Existe siempre la posibilidad de erupciones late­rales que aumentan su peligro y radio de acción.

    El "lahar" fue una avalancha de lodo que cubrió a la poblacion de Armero; lo componían materiales inorgánicos provenientes del volcan, mezclados con los materiales orgánicos presentes en las tierras fertiles dedicadas a la agricultura y la ganadería. Estudios microbiológicos demostraron la presencia de una rica flora bacteriana y de hongos...

  1. Ecosystem-based management and the wealth of ecosystems

    OpenAIRE

    Yun, Seong Do; Hutniczak, Barbara; Abbott, Joshua K.; Fenichel, Eli P.

    2017-01-01

    Ecosystems store vast quantities of wealth, but difficulties measuring wealth held in ecosystems prevent its inclusion in accounting systems. Ecosystem-based management endeavors to manage ecosystems holistically. However, ecosystem-based management lacks headline indicators to evaluate performance. We unify the inclusive wealth and ecosystem-based management paradigms, allowing apples-to-apples comparisons between the wealth of the ecosystem and other forms of wealth, while providing a headl...

  2. Seasonal shift in net ecosystem production in a tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Ram, A.S.P.; Nair, S.; Chandramohan, D.

    ) and community respiration (R). Measurements of these variables are a prerequisite to assess the trophic status of aquatic ecosystems. Del Giorgio et al. (1997) suggested that metabolic balance depends on the primary productivity of the system. The rate...), and heterotrophy is not restricted to oligotrophic sys- tems. Of late, there has been considerable debate on the role of planktonic communities as sources (del Giorgio et al. 1997; Duarte et al. 2001) or sinks (Williams 1998) of carbon in subtropical and temperate...

  3. Biometría del esqueleto postcraneal en muestras del Holoceno tardío de la Cuenca del Lago Salitroso (provincia de Santa Cruz

    Directory of Open Access Journals (Sweden)

    Barrientos, Gustavo

    2001-01-01

    Full Text Available El objetivo de la presente comunicación es presentar la información osteométrica correspondiente al esqueleto postcraneal de una muestra de 18 individuos adultos de diferente sexo y edad, provenientes la cuenca del lago Salitroso (N.O. de la provincia de Santa Cruz. Los mismos fueron recuperados a partir de la excavación de chenques y hoquedades naturales sobre roca, con un rango de edades radiocarbónicas situado entre ca. 2500 y 300 años AP. El presente estudio se integra a una investigación de mayores alcances orientada a analizar la evolución de las poblaciones humanas del centro-sur de la Patagonia continental durante el Holoceno tardío. En este estudio se consideraron 45 variables métricas correspondientes a 10 unidades anatómicas del esqueleto postcraneano (húmero, radio, cúbito, clavícula, fémur, tibia, peroné, escápula, sacro y coxal. A nivel de la localidad, se establecieron comparaciones basadas en análisis uni y multivariados entre el conjunto de entierros más antiguo (ca. 2500-1800 años AP con el más reciente (ca. 1000-300 años AP, con la finalidad de detectar diferencias significativas entre ambas submuestras cronológicas. Finalmente, se analizaron los datos regionales en relación con la variabilidad registrada en otras muestras de Patagonia continental (Chubut y sur de Santa Cruz y Tierra del Fuego.

  4. Silvicultural operation on the forest ecosystems: Methodology for forest hydrological monitoring; Effetti del taglio sugli ecosistemi forestali in ambiente montamo: Proposte metologiche per il monitoraggio dell`idrologia forestale

    Energy Technology Data Exchange (ETDEWEB)

    Andreotti, A; Collina, M; Serra, F; Naviglio, L [ENEA, Centro Ricerche Brasimone, Bologna (Italy). Dipt. Ambiente; Bonora, P [ENEA, Centro Ricerche ` E. Clementel` , Bologna (Italy). Dipt. Ambiente; Gregori, E; Napoli, R [Istituto Sperimentale per lo Studio e la Difesa del Suolo, Firenze (Italy)

    1997-03-01

    During 1994, Ente Nazionale per l`Energia Elettrica, with the contribution of the Ministry of Agricultural, Alimentary and Forest Resources, started a research program to assess the effects of the silvicultural operations on the forest ecosystems, investigating particularly the hydrological aspects, the erosion and the nutrient cycle. The research must monitor two forest plots coinciding with two secondary watersheds in the Torto stream valley (Northern Italy - high Bolognan Appennines) during about ten years. One plot will be let naturally evolve, while the other one, after a period of 3-5 years, must be subject to a cut; the comparison between the two plots will allow us to evaluate the nature and the size of the changes induced in the ecosystem by man through the silvicultural operations. Because of the complexity of the environmental parameters the authors want to study, initially it was necessary to determine methodology and instruments required for attaining the set goals. In this technical report are shown the results the authors obtained at the end of this first testing and setting up period, and therefore it assumes the form of a methodological protocol for carrying out the research itself.

  5. BUSINESS ECOSYSTEMS VS BUSINESS DIGITAL ECOSYSTEMS

    Directory of Open Access Journals (Sweden)

    Marinela Lazarica

    2006-05-01

    Full Text Available E-business is often described as the small organisations’ gateway to global business and markets. The adoption of Internet-based technologies for e-business is a continuous process, with sequential steps of evolution. The latter step in the adoption of Internet-based technologies for business, where the business services and the software components are supported by a pervasive software environment, which shows an evolutionary and self-organising behaviour are named digital business ecosystems. The digital business ecosystems are characterized by intelligent software components and services, knowledge transfer, interactive training frameworks and integration of business processes and e-government models.

  6. Belowground ecosystems [chapter 9

    Science.gov (United States)

    Carole Coe Klopatek

    1995-01-01

    The USDA Forest Service defined ecosystem management as "an ecological approach to achieve multiple-use management of national forests and grasslands by blending the needs of people and environmental values in such a way that national forests and grasslands represent diverse, healthy, productive, and sustainable ecosystems" (June 4, 1992, letter from Chief FS...

  7. Payments for Ecosystem Services

    DEFF Research Database (Denmark)

    Chan, Kai M.A; Anderson, Emily K.; Chapman, Mollie

    2017-01-01

    Payments for ecosystem services (PES) programs are one prominent strategy to address economic externalities of resource extraction and commodity production, improving both social and ecological outcomes. But do PES and related incentive programs achieve that lofty goal? Along with considerable en...... sustainable relationships with nature, conserving and restoring ecosystems and their benefits for people now and in the future....

  8. Ecosystem Management and Sustainability

    Science.gov (United States)

    J.D. Peine; B.L. Jacobs; K.E. Franzreb; M.R. Stevens

    2011-01-01

    Ecosystem management (EM) promotes an integrated approach to environmental issues; its central goal is the protection of entire ecosystems. By focusing on an interdisciplinary solution to environmental challenges, EM can help to synthesize societal, economic scientific, and governmental goals. Furthermore, as EM becomes part of the foundation of environmental...

  9. Radionuclides in terrestrial ecosystems

    International Nuclear Information System (INIS)

    Bocock, K.L.

    1981-01-01

    This report summarizes information on the distribution and movement of radionuclides in semi-natural terrestrial ecosystems in north-west England with particular emphasis on inputs to, and outputs from ecosystems; on plant and soil aspects; and on radionuclides in fallout and in discharges by the nuclear industry. (author)

  10. Coastal ecosystems, productivity and ecosystem protection: Coastal ecosystem management

    International Nuclear Information System (INIS)

    Ngoile, M.A.K.; Horrill, C.J.

    1993-01-01

    The coastal zone is a complex ecosystem under the influence of physical, chemical and biological processes. Under natural conditions these processes interact and maintain an equilibrium in the coastal ecosystem. Man makes a variety of important uses of coastal resources, ranging from harvesting of living resources, extraction of nonliving resources, and recreation, to the disposal of wastes. Man's extensive use of the oceans introduces factors which bring about an imbalance in the natural processes, and may result in harmful and hazardous effects to life hindering further use. Man's pressure on the resources of the coastal zone is already manifest and will increase manifold. This calls for an immediate solution to the protection and sustainable use of coastal resources. The current sectorized approach to the management of human activities will not solve the problem because the different resources of the coastal zone interact in such a manner that disturbances in one cause imbalance in the others. This is further complicated by the sectorized approach to research and limited communication between policy makers, managers, and scientists. This paper discusses strategies for managing coastal-resources use through an integrated approach. The coastal zone is presented as a unified ecosystem in equilibrium and shows that man's extensive use of the coastal resources destabilizes this equilibrium. Examples from the East Africa Region are presented. 15 refs, 2 figs, 3 tabs

  11. Armas en las casas burgalesas del siglo XVIII. Entre la funcionalidad y el exhibicionismo

    Directory of Open Access Journals (Sweden)

    Francisco José SANZ DE LA HIGUERA

    2012-12-01

    Full Text Available En los interiores domésticos del Burgos del siglo XVIII, los inventarios post mortem permiten un análisis intenso de un aspecto bastante desconocido e inquietante de la cultura material, la posesión y usufructo de armas entre la población urbana del Antiguo Régimen. No todas las categorías socioprofesionales y socioeconómicas tenían acceso de la misma manera a las armas de fuego o a las armas «blancas» y su disponibilidad cambia a lo largo de la centuria. ¿Quiénes eran propietarios de armas? ¿Cuál era su peso relativo sobre el volumen de sus fortunas? ¿A qué responde su aparición en las viviendas? ¿Protección personal y doméstica, exigencias profesionales, exhibicionismo en la jerarquía social y boato, necesidad cinegética? ¿Qué grado de permeabilidad y penetración conocieron las armas a lo largo del Setecientos?

  12. Mapping cultural ecosystem services:

    DEFF Research Database (Denmark)

    Paracchini, Maria Luisa; Zulian, Grazia; Kopperoinen, Leena

    2014-01-01

    Research on ecosystem services mapping and valuing has increased significantly in recent years. However, compared to provisioning and regulating services, cultural ecosystem services have not yet been fully integrated into operational frameworks. One reason for this is that transdisciplinarity...... surveys are a main source of information. Among cultural ecosystem services, assessment of outdoor recreation can be based on a large pool of literature developed mostly in social and medical science, and landscape and ecology studies. This paper presents a methodology to include recreation...... in the conceptual framework for EU wide ecosystem assessments (Maes et al., 2013), which couples existing approaches for recreation management at country level with behavioural data derived from surveys, and population distribution data. The proposed framework is based on three components: the ecosystem function...

  13. Externalities assessment of a coal power plant in the forest ecosystems in Valdecaballeros Area; Estimacion de las externalidades de una central termica de carbon en los ecosistemas forestales del Area de Valdecaballeros

    Energy Technology Data Exchange (ETDEWEB)

    Laforga, P; Planas, B

    1995-07-01

    The book is divided in two parts. The first one analyzes the critical load and level concepts, and the methodological framework for Environmental Impact Statement (E.L.S.). In line with this, critical loads and levels represent the system vulnerability and excedances of critical values identify zones where impacts could occur. These are evaluated according to a set of criteria, talking into account present and future land use, their socio cultural interest, economic value of their natural resources and ecological quality of the whole system. In addition to Environment Impact Statement of air pollutants, the proposed formalism allows assessing the external cost of gaseous emission. The second part applies the developed ideas to a practical case: a hypothetical coal power plant on Valdecaballeros (Badajoz, Spain). Environmental impact on forestry ecosystems is studied on a 70 km radius area around the plant. The assessment of the external costs rely on yield losses associated with gaseous emission of the hypothetical plant. (Author) 100 refs.

  14. Ecosystem approach in education

    Science.gov (United States)

    Nabiullin, Iskander

    2017-04-01

    Environmental education is a base for sustainable development. Therefore, in our school we pay great attention to environmental education. Environmental education in our school is based on ecosystem approach. What is an ecosystem approach? Ecosystem is a fundamental concept of ecology. Living organisms and their non-living environments interact with each other as a system, and the biosphere planet functions as a global ecosystem. Therefore, it is necessary for children to understand relationships in ecosystems, and we have to develop systems thinking in our students. Ecosystem approach and systems thinking should help us to solve global environmental problems. How do we implement the ecosystem approach? Students must understand that our biosphere functions as a single ecosystem and even small changes can lead to environmental disasters. Even the disappearance of one plant or animal species can lead to irreversible consequences. So in the classroom we learn the importance of each living organism for the nature. We pay special attention to endangered species, which are listed in the Red Data List. Kids are doing projects about these organisms, make videos, print brochures and newspapers. Fieldwork also plays an important role for ecosystem approach. Every summer, we go out for expeditions to study species of plants and animals listed in the Red Data List of Tatarstan. In class, students often write essays on behalf of any endangered species of plants or animals, this also helps them to understand the importance of each living organism in nature. Each spring we organise a festival of environmental projects among students. Groups of 4-5 students work on a solution of environmental problems, such as water, air or soil pollution, waste recycling, the loss of biodiversity, etc. Participants shoot a clip about their project, print brochures. Furthermore, some of the students participate in national and international scientific Olympiads with their projects. In addition to

  15. Diversity, dynamics and biogeography of Chilean benthic nearshore ecosystems: an overview and guidelines for conservation Diversidad, dinámica y biogeografía del ecosistema costero bentónico de Chile: revisión y bases para conservación marina

    Directory of Open Access Journals (Sweden)

    MIRIAM FERNANDEZ

    2000-12-01

    characteristics in terms of ecosystem processes (e.g., particular disturbance and upwelling regimes in coastal marine ecosystems and species (e.g., endemic and keystone species. For most marine invertebrates and macroalgae, hotspots in species diversity are present in southern Chile. New studies addressing the causal factors generating these large-scale patterns of species distribution are also needed; information about coastal oceanography and larval supply is still poor. This information crucial for the design of a marine reserve network. The information available on community structure and ecosystem functioning, especially highlighting the effect of human impact, comes from very few geographic regions. More information about community structure for other areas of the coast is required, particularly considering the strong differences in temperature, circulation patterns, habitat heterogeneity, species composition, as well as of upwelling and El Niño effects along the 4,000 km of coastline. Finally, we list what we think are the most harmful human activities by area and environment along the coast, and integrate this information to suggest possible environmental indicators, and basic needs and guidelines for marine conservation in ChileA pesar de que Chile ha sido un país pionero en estudios del efecto del impacto humano sobre la estructura comunitaria en ambientes marinos, y a pesar de la enorme importancia económica y social que el ambiente marino tiene para el país, el desarrollo de programas de conservación marina y de bases científicas para la sustentabilidad no se han generado a la misma tasa a la que han explotado los recursos y se ha utilizado el ambiente costero para diversos fines. Aunque nosotros pensamos que el establecimiento de planes de conservación a lo largo de la costa de Chile debe basarse en varios factores, los principios científicos, biológicos y ecológicos deben guiar muchos de estos esfuerzos, y en este trabajo nosotros intentamos presentar una

  16. Dieta del Cernícalo Americano (Falco sparverius Linnaeus, 1758 en dos hábitats interandinos del norte de Ecuador

    Directory of Open Access Journals (Sweden)

    Glenda M. Pozo-Zamora

    2017-07-01

    Full Text Available El cernícalo americano es una especie de ave rapaz ampliamente distribuida desde Alaska hasta Tierra de Fuego en Argentina. Su dieta generalista está basada principalmente en invertebrados. En Ecuador existe escasa información biológica de ésta especie, desconociéndose aspectos de alimentación. En el presente trabajo se da a conocer la dieta del cernícalo americano, por medio del análisis de egagrópilas colectadas en dos hábitats ubicados en la región interandina en el norte de Ecuador. Los ítems más representativos para Sangolquí y Tababela fueron los coleópteros (48.4 y 39.5%, seguidos por orthópteros (31.3 y 30.7 % respectivamente. En términos de biomasa, los mamíferos son los más importantes dentro de la dieta del cernícalo americano con el 40.3% para Sangolquí y el 70.8% en Tababela. El índice de Shannon (H´= 1.894 indica una mediana diversidad de presas, y la amplitud de dieta (0.26 indica que ésta especie presenta una dieta especialista, difiriendo de otros hábitats donde presenta dieta generalista.

  17. Ecosystem quality in LCIA

    DEFF Research Database (Denmark)

    Woods, John S.; Damiani, Mattia; Fantke, Peter

    2017-01-01

    Purpose: Life cycle impact assessment (LCIA) results are used to assess potential environmental impacts of different products and services. As part of the UNEP-SETAC life cycle initiative flagship project that aims to harmonize indicators of potential environmental impacts, we provide a consensus...... viewpoint and recommendations for future developments in LCIA related to the ecosystem quality area of protection (AoP). Through our recommendations, we aim to encourage LCIA developments that improve the usefulness and global acceptability of LCIA results. Methods: We analyze current ecosystem quality...... metrics and provide recommendations to the LCIA research community for achieving further developments towards comparable and more ecologically relevant metrics addressing ecosystem quality. Results and discussion: We recommend that LCIA development for ecosystem quality should tend towards species...

  18. List identifies threatened ecosystems

    Science.gov (United States)

    Showstack, Randy

    2012-09-01

    The International Union for Conservation of Nature (IUCN) announced on 9 September that it will develop a new Red List of Ecosystems that will identify which ecosystems are vulnerable or endangered. The list, which is modeled on the group's Red List of Threatened Species™, could help to guide conservation activities and influence policy processes such as the Convention on Biological Diversity, according to the group. “We will assess the status of marine, terrestrial, freshwater, and subterranean ecosystems at local, regional, and global levels,” stated Jon Paul Rodriguez, leader of IUCN's Ecosystems Red List Thematic Group. “The assessment can then form the basis for concerted implementation action so that we can manage them sustainably if their risk of collapse is low or restore them if they are threatened and then monitor their recovery.”

  19. Formation of Service Ecosystems

    DEFF Research Database (Denmark)

    Jonas, Julia M.; Sörhammar, David; Satzger, Gerhard

    – i.e. the “birth phase” (Moore, 2009) of a service ecosystem. This paper, therefore, aims to explore how the somewhat “magic” processes of service ecosystem formation that are being taken for granted actually occur. Methodology/Approach: Building on a review of core elements in the definitions...... for Harvard students) or value proposition (share messages, photos, videos, etc. with friends). Processes of configuring actors, resources, and value propositions are influenced by the structural embeddedness of the service ecosystem (e.g., regional infrastructure, existing networks of actors, or resource...... availability) as well as guided by the actors’ own and shared institutions (e.g., rules, norms,and beliefs).We contextualize each starting point with illustrative cases and analyze the service ecosystem configuration process: “Axoon/Trumpf” (initiated by resources), “JOSEPHS – the service manufactory...

  20. Revisiting software ecosystems research

    DEFF Research Database (Denmark)

    Manikas, Konstantinos

    2016-01-01

    ‘Software ecosystems’ is argued to first appear as a concept more than 10 years ago and software ecosystem research started to take off in 2010. We conduct a systematic literature study, based on the most extensive literature review in the field up to date, with two primarily aims: (a) to provide...... an updated overview of the field and (b) to document evolution in the field. In total, we analyze 231 papers from 2007 until 2014 and provide an overview of the research in software ecosystems. Our analysis reveals a field that is rapidly growing both in volume and empirical focus while becoming more mature...... from evolving. We propose means for future research and the community to address them. Finally, our analysis shapes the view of the field having evolved outside the existing definitions of software ecosystems and thus propose the update of the definition of software ecosystems....

  1. Ecosystem Analysis Program

    International Nuclear Information System (INIS)

    Burgess, R.L.

    1978-01-01

    Progress is reported on the following research programs: analysis and modeling of ecosystems; EDFB/IBP data center; biome analysis studies; land/water interaction studies; and computer programs for development of models

  2. Potential universal applicability of soil bioindicators: evaluation in three temperate ecosystems Aplicación potencial universal de bioindicadores del suelo: su evaluación en tres ecosistemas templados

    Directory of Open Access Journals (Sweden)

    Mirta G González

    2007-12-01

    Full Text Available Three selected soils from three countries with temperate climates have been analyzed. Two of the soils are silty loams (Buenos Aires, Argentina, and Salamanca, Spain and the third one is a sandy loam (Peccioli, Italy. Soil samples representing three agricultural managements were obtained from the top layer (0-10 cm, i.e. intensively cultivated, cultivated and undisturbed native soils. Soil organic carbon (SOC, total nitrogen (Nt, ATP, urease, protease, phosphatase, b-glucosidase, dehydrogenase (DHA, and arginine ammonification (ARA were determined and compared. SOC and Nt were significantly higher (P Se compararon las actividades enzimáticas de distintos ecosistemas con diferentes características de uso de suelo para utilizarlas como bioindicadores. Se analizaron suelos de tres países de climas templados. Dos de los suelos presentan textura franco limosa (Buenos Aires, Argentina y Salamanca, España y el tercero franco arenosa (Peccioli, Italia. Se obtuvieron muestras de 10 cm de profundidad provenientes de tres manejos diferentes en cada uno de ellos: agricultura intensiva, rotación cultivo-pastura y suelo nativo. En todos los sitios se determinaron y compararon el Carbono orgánico(SOC, Nitrógeno total(Nt, contenido de ATP, acividad enzimática de la ureasa, proteasa, fosfatasa, b-glucosidasa, deshidrogenasa (DHA y arginina(ARA. Se encontró una buena correlación (p < 0,05 entre ATP, DHA, ARA con el SOC y Nt, indicando que estos parámetros del suelo están relacionados con las propiedades biológicas y la actividad bioquímica. No se encontró correlación entre DHA con el SOC, con el Nt , ni con la actividad de la proteasa en suelos de agricultura intensiva, indicando que en ecosistemas de bajos contenidos de sustratos exógenos para metabolizar, los microorganismos están en un nivel bajo de actividad. La similitud de los resultados obtenidos de los suelos de tres diferentes países confirman la utilidad de las variables bioqu

  3. Stakeholder Values and Ecosystems

    OpenAIRE

    Sveinsdottir, Thordis; Wessels, Bridgette; Smallwood, Rod; Linde, Peter; Kalla, Vasso; Tsoukala, Victoria; Sondervan, Jeroen

    2013-01-01

    This report is the deliverable for Work Package 1 (WP1), Stakeholder Values and Ecosystems, of the EU FP7 funded project RECODE (Grant Agreement No: 321463), which focuses on developing Policy Recommendations for Open Access to Research Data in Europe. WP1 focuses on understanding stakeholder values and ecosystems in Open Access, dissemination and preservation in the area of scientific and scholarly data (thus not government data). The objectives of this WP are as follows: • Identify and map ...

  4. Terrestrial ecosystems and biodiversity

    CSIR Research Space (South Africa)

    Davis-Reddy, Claire

    2017-10-01

    Full Text Available Ecoregions Terrestrial Biomes Protected Areas Climate Risk and Vulnerability: A Handbook for Southern Africa | 75 7.2. Non-climatic drivers of ecosystem change 7.2.1. Land-use change, habitat loss and fragmentation Land-use change and landscape... concentrations of endemic plant and animal species, but these mainly occur in areas that are most threatened by human activity. Diverse terrestrial ecosystems in the region include tropical and sub-tropical forests, deserts, savannas, grasslands, mangroves...

  5. Privacy driven internet ecosystem

    OpenAIRE

    Trinh, Tuan Anh; Gyarmati, Laszlo

    2012-01-01

    The dominant business model of today's Internet is built upon advertisements; users can access Internet services while the providers show ads to them. Although significant efforts have been made to model and analyze the economic aspects of this ecosystem, the heart of the current status quo, namely privacy, has not received the attention of the research community yet. Accordingly, we propose an economic model of the privacy driven Internet ecosystem where privacy is handled as an asset that c...

  6. Monetary accounting of ecosystem services

    NARCIS (Netherlands)

    Remme, R.P.; Edens, Bram; Schröter, Matthias; Hein, Lars

    2015-01-01

    Ecosystem accounting aims to provide a better understanding of ecosystem contributions to the economy in a spatially explicit way. Ecosystem accounting monitors ecosystem services and measures their monetary value using exchange values consistent with the System of National Accounts (SNA). We

  7. Diversos usos instrumentales del aparato masticatorio en restos humanos de la Patagonia Argentina

    Directory of Open Access Journals (Sweden)

    Kozameh, Livia Febes

    2005-01-01

    Full Text Available Desgastes dentarios atípicos y disarmónicos, asociados a patologías sugirieron la posibilidad que los mismos se hubieran producido por una actividad masticatoria excesiva y no alimentaria. La variedad de rastros registrados sugiere el uso de la boca con fines instrumentales, como recurso posiblemente constante. Los casos seleccionados son seis y sus rasgos predominantes se describen sucintamente. 1 Muestra dentaria de canoeros fueguinos. Fracturas cuspídeas pulimentadas únicamente en denticiones femeninas.2Resto de cazador canoero del Beagle. Notables desgastes dentarios con distintas angulaciones a modo de zigzag. Raíces en función oclusal con procesos alveolares concomitantes. 3Resto de cazador pedestre de Tierra del Fuego. Disminución del tamaño coronal de los dientes anteriores y primeros premolares, con pérdida completa de su morfología. Los bordes incisales exhiben tres planos de desgaste con diferentes direcciones. 4 y 5Cazadores de Santa Cruz. En uno de ellos los desgastes coronales son convexos en todos sus dientes. Patologías alveolares. En el otro ejemplar el desgaste tornó cilíndricas las coronas de las piezas anteriores. 6Resto femenino de Chubut. Pérdida prematura de los cuatro dientes anteriores con compromiso óseo y canino transpuesto.

  8. Dimensions of ecosystem theory

    International Nuclear Information System (INIS)

    O'Neill, R.V.; Reichle, D.E.

    1979-01-01

    Various dimensions of ecosystem structure and behavior that seem to develop from the ubiquitous phenomena of system growth and persistence were studied. While growth and persistence attributes of ecosystems may appear to be simplistic phenomena upon which to base a comprehensive ecosystem theory, these same attributes have been fundamental to the theoretical development of other biological disciplines. These attributes were explored at a hierarchical level in a self-organizing system, and adaptive system strategies that result were analyzed. Previously developed causative relations (Reichle et al., 1975c) were examined, their theoretical implications expounded upon, and the assumptions tested with data from a variety of forest types. The conclusions are not a theory in themselves, but a state of organization of concepts contributing towards a unifying theory, along the lines promulgated by Bray (1958). The inferences drawn rely heavily upon data from forested ecosystems of the world, and have yet to be validated against data from a much more diverse range of ecosystem types. Not all of the interpretations are logically tight - there is room for other explanations, which it is hoped will provide fruitful grounds for further speculation

  9. Fire ecology and management in grasslands of the American Southwest (Ecologia a de fuego y manejo de pastizales en el Sudoeste Norteamericano)

    Science.gov (United States)

    Guy R. McPherson

    2006-01-01

    Many ecologists have indicated that fire is as important as wind or precipitation in shaping North American ecosystems. There is little question that fire is prevalent in grasslands and that it contributes to the structure and function of such systems in the Southwest. In this paper I outline pre-settlement fire regimes, then describe post-settlement regimes and...

  10. Ecosystem Vulnerability Review: Proposal of an Interdisciplinary Ecosystem Assessment Approach

    Science.gov (United States)

    Weißhuhn, Peter; Müller, Felix; Wiggering, Hubert

    2018-06-01

    To safeguard the sustainable use of ecosystems and their services, early detection of potentially damaging changes in functional capabilities is needed. To support a proper ecosystem management, the analysis of an ecosystem's vulnerability provide information on its weaknesses as well as on its capacity to recover after suffering an impact. However, the application of the vulnerability concept to ecosystems is still an emerging topic. After providing background on the vulnerability concept, we summarize existing ecosystem vulnerability research on the basis of a systematic literature review with a special focus on ecosystem type, disciplinary background, and more detailed definition of the ecosystem vulnerability components. Using the Web of ScienceTM Core Collection, we overviewed the literature from 1991 onwards but used the 5 years from 2011 to 2015 for an in-depth analysis, including 129 articles. We found that ecosystem vulnerability analysis has been applied most notably in conservation biology, climate change research, and ecological risk assessments, pinpointing a limited spreading across the environmental sciences. It occurred primarily within marine and freshwater ecosystems. To avoid confusion, we recommend using the unambiguous term ecosystem vulnerability rather than ecological, environmental, population, or community vulnerability. Further, common ground has been identified, on which to define the ecosystem vulnerability components exposure, sensitivity, and adaptive capacity. We propose a framework for ecosystem assessments that coherently connects the concepts of vulnerability, resilience, and adaptability as different ecosystem responses. A short outlook on the possible operationalization of the concept by ecosystem vulnerabilty indices, and a conclusion section complete the review.

  11. An overview of interactions among oceanography, marine ecosystems, climatic and human disruptions along the eastern margins of the Pacific Ocean Una visión general de las interacciones entre la oceanografía, los ecosistemas marinos y las disrupciones climáticas y antrópicas en los márgenes este del Océano Pacífico

    Directory of Open Access Journals (Sweden)

    PATRICIA M. HALPIN

    2004-09-01

    Full Text Available Physical processes, biotic processes and human activities all act to shape marine ecosystems. Future management of these valuable ecosystems requires an integrative approach that takes into account complicated organismal interactions, oceanographic processes that span large scales of time and space, and how anthropogenic effects interact with the natural environment. The temperate west coasts of North and South America represent a unique opportunity for comparison, as many of the same oceanographic processes, particularly upwelling, occur off both coasts. Additionally, a number of marine ecosystems in both areas have surprising parallels. Here we present an overview of the oceanographic processes that dominate the coastlines, and give examples of ecosystems and the effects that oceanography, human activities and their interaction have on the communitiesLos procesos físicos y biológicos y las actividades humanas determinan los ecosistemas marinos. El manejo futuro de estos valiosos ecosistemas requiere de una aproximación integrativa que considere las complejas interacciones entre individuos, los procesos oceanográficos que se desarrollan a gran escala espacial y temporal, y la interacción de los efectos antropogénicos con el medio ambiente. Las costas templadas del oeste de Norteamérica y Sudamérica representan una oportunidad única para efectuar comparaciones ya que muchos procesos oceanográficos, particularmente la surgencia costera, ocurren en ambas costas. Adicionalmente, numerosos ecosistemas marinos en ambas áreas presentan sorprendentes paralelos. La presente revisión ofrece una visión general de los procesos oceanográficos dominantes en ambas costas y ofrece ejemplos de ecosistemas y los efectos que la oceanografía, las actividades humanas y las interacciones entre individuos tienen sobre las comunidades marinas

  12. Working group 7: Ecosystems

    International Nuclear Information System (INIS)

    Verheyen, R.

    1976-01-01

    The purpose of this article is to evaluate the environmental impact of nuclear power plants. The effects of ionizing radiations, of the thermal and chemical pollution on aquatic ecosystems as well as on terrestrial ecosystems have been estimated. After a general survey of such effects and their interaction, practical conclusions in regard to determined areas such as Meuse-Escaut marine and the coast have been drawn. The contamination effects of food chains have been evaluted under deliberately pessimistic conditions with regard to the choice of the radionuclide as well as of concentration factors. Following the biodegradation conditions of the surface waters, criteria for the quality of the aquatic ecosystems have been established. Finally, attention has been paid on certain factors affecting the site selection especially within the frame of the nature conservation. The effects of cooling towers have been also considered. (G.C.)

  13. Sea Ice Ecosystems

    Science.gov (United States)

    Arrigo, Kevin R.

    2014-01-01

    Polar sea ice is one of the largest ecosystems on Earth. The liquid brine fraction of the ice matrix is home to a diverse array of organisms, ranging from tiny archaea to larger fish and invertebrates. These organisms can tolerate high brine salinity and low temperature but do best when conditions are milder. Thriving ice algal communities, generally dominated by diatoms, live at the ice/water interface and in recently flooded surface and interior layers, especially during spring, when temperatures begin to rise. Although protists dominate the sea ice biomass, heterotrophic bacteria are also abundant. The sea ice ecosystem provides food for a host of animals, with crustaceans being the most conspicuous. Uneaten organic matter from the ice sinks through the water column and feeds benthic ecosystems. As sea ice extent declines, ice algae likely contribute a shrinking fraction of the total amount of organic matter produced in polar waters.

  14. LOS DESTINOS DEL ZAPATISMO Y LA CUESTIÓN DE LA AUTONOMÍA

    Directory of Open Access Journals (Sweden)

    Rafael Miranda Redondo

    2017-08-01

    Full Text Available En el artículo a continuación abordamos la cuestión de los destinos del zapatismo como movimiento social a la luz de la cuestión de la autonomía. Ese cometido lo trabajamos a la luz de hipótesis de Castoriadis en el sentido de que el punto clave, en lo que a la autonomía se refiere, no es la resistencia, la identidad o el comunitarismo, mucho menos el relativismo o el supuesto universalismo y si la relación respecto a la institución que está en el propio origen. En este sentido la prueba de fuego respecto al aporte de los movimientos sociales en el sentido del proyecto de autonomía pasa por la negativa de ocultar el poder instituyente que resignifica el propio origen, sometiendo dicha tendencia a la autoalteración y en ese sentido no respecto de lo que es y si respecto de lo que va a ser. Dos instituciones están en el origen del zapatismo contemporáneo, el marxismo y la teología de la liberación, que en versión tercermundista mesiánica, en boca del fanonísmo y el foquísmo, permean los ambientes del activismo político y de la academia, gracias al ultimo recurso de la identidad como algo esencial. En seguimiento a un prolongado ejercicio de dialogo con esa cultura política adelantamos en el cierre del presente escrito una tendencia al cuestionamiento radical en lo que a la teología de la liberación se refiere por un lado y una asignatura pendiente, un duelo congelado diríamos, respecto al marxismo.

  15. Potencial del Agua del suelo

    Directory of Open Access Journals (Sweden)

    Bustamante Heliodoro

    1986-12-01

    Full Text Available La energía potencial del agua presenta diferencias de un punto del suelo a otro; esas diferencias son las que originan el movimiento del agua de acuerdo a la tendencia universal de la materia en el sentido de moverse de donde la energía potencial es mayor a donde dicha energía es menor. En el suelo el agua en consecuencia se mueve hacia donde su energía decrece hasta lograr su estado de equilibrio. Se desprende entonces que la cantidad de energía potencial absoluta contenida en el agua, no es importante por sí misma, sino por su relación con la energía en diferentes lugares dentro del suelo. El concepto Potencial de agua del suelo es un criterio para esta energía.

  16. Governance of Ecosystem Services

    NARCIS (Netherlands)

    Primmer, Eeva; Jokinen, Pekka; Blicharska, Malgorzata; Barton, David N.; Bugter, Rob; Potschin, Marion

    2015-01-01

    Biodiversity conservation policies justified with science and intrinsic value arguments have produced disappointing outcomes, and the need for conservation is now being additionally justified with the concept of ecosystem services. However, little, if any empirical attention is paid to ways in

  17. Shelf-sea ecosystems

    Energy Technology Data Exchange (ETDEWEB)

    Walsh, J J

    1980-01-01

    An analysis of the food chain dynamics of the Oregon, Alaskan, and New York shelves is made with respect to differences in physical forcing of these ecosystems. The world's shelves are 10% of the area of the ocean, yield 99% of the world's fish catch, and may be a major sink in the global CO/sub 2/ budget.

  18. Partitioning ecosystems for sustainability.

    Science.gov (United States)

    Murray, Martyn G

    2016-03-01

    Decline in the abundance of renewable natural resources (RNRs) coupled with increasing demands of an expanding human population will greatly intensify competition for Earth's natural resources during this century, yet curiously, analytical approaches to the management of productive ecosystems (ecological theory of wildlife harvesting, tragedy of the commons, green economics, and bioeconomics) give only peripheral attention to the driving influence of competition on resource exploitation. Here, I apply resource competition theory (RCT) to the exploitation of RNRs and derive four general policies in support of their sustainable and equitable use: (1) regulate resource extraction technology to avoid damage to the resource base; (2) increase efficiency of resource use and reduce waste at every step in the resource supply chain and distribution network; (3) partition ecosystems with the harvesting niche as the basic organizing principle for sustainable management of natural resources by multiple users; and (4) increase negative feedback between consumer and resource to bring about long-term sustainable use. A simple policy framework demonstrates how RCT integrates with other elements of sustainability science to better manage productive ecosystems. Several problem areas of RNR management are discussed in the light of RCT, including tragedy of the commons, overharvesting, resource collapse, bycatch, single species quotas, and simplification of ecosystems.

  19. Payment for ecosystem services

    DEFF Research Database (Denmark)

    Zandersen, Marianne; Oddershede, Jakob Stoktoft; Pedersen, Anders Branth

    Research question: Northern Europe experiences an increasingly wet climate, leading to more frequent and severe fluvial flood events. Ecosystem-based Adaptation (EbA) is becoming recognised as a valuable yet under-utilised means to alleviating negative effects of a changing climate. This however,...

  20. Biocomplexity in Mangrove Ecosystems

    Science.gov (United States)

    Feller, I. C.; Lovelock, C. E.; Berger, U.; McKee, K. L.; Joye, S. B.; Ball, M. C.

    2010-01-01

    Mangroves are an ecological assemblage of trees and shrubs adapted to grow in intertidal environments along tropical coasts. Despite repeated demonstration of their economic and societal value, more than 50% of the world's mangroves have been destroyed, 35% in the past two decades to aquaculture and coastal development, altered hydrology, sea-level rise, and nutrient overenrichment. Variations in the structure and function of mangrove ecosystems have generally been described solely on the basis of a hierarchical classification of the physical characteristics of the intertidal environment, including climate, geomorphology, topography, and hydrology. Here, we use the concept of emergent properties at multiple levels within a hierarchical framework to review how the interplay between specialized adaptations and extreme trait plasticity that characterizes mangroves and intertidal environments gives rise to the biocomplexity that distinguishes mangrove ecosystems. The traits that allow mangroves to tolerate variable salinity, flooding, and nutrient availability influence ecosystem processes and ultimately the services they provide. We conclude that an integrated research strategy using emergent properties in empirical and theoretical studies provides a holistic approach for understanding and managing mangrove ecosystems.

  1. [Urban ecosystem services: A review].

    Science.gov (United States)

    Mao, Qi-zheng; Huang, Gan-lin; Wu, Jian-guo

    2015-04-01

    Maintaining and improving ecosystem services in urban areas and human well-being are essential for sustainable development and therefore constitute an important topic in urban ecology. Here we reviewed studies on ecosystem services in urban areas. Based on the concept and classification of urban ecosystem services, we summarized characteristics of urban ecosystem services, including the human domination, high demand of ecosystem services in urban areas, spatial heterogeneity and temporal dynamics of ecosystem services supply and demand in urban areas, multi-services of urban green infrastructures, the socio-economic dimension of ecosystem services supply and ecosystem disservices in urban areas. Among different urban ecosystem services, the regulating service and cultural service are particularly indispensable to benefit human health. We pointed out that tradeoffs among different types of ecosystem services mostly occur between supportive service and cultural service, as well as regulating service and cultural service. In particular, we emphasized the relationship between landscape design (i.e. green infrastructure) and ecosystem services supply. Finally, we discussed current gaps to link urban ecosystem services studies to landscape design and management and pointed out several directions for future research in urban ecosystem services.

  2. Reservorios y flujos de carbono en un gradiente de intensificación de usos del suelo de un ecosistema mediterráneo: factores de control y capacidad de secuestro de carbono = Carbon pools and fluxes along a land use intensification gradient in a Mediterranean ecosystem: controls and carbon sequestration capacity

    OpenAIRE

    Almagro Bonmatí, María

    2011-01-01

    Se estudia el ciclo del carbono en diferentes usos del suelo (uso forestal, campo agrícola abandonado y olivar de secano) de un ecosistema mediterráneo ante la perspectiva del cambio climático. La hipótesis general de esta tesis es que los cambios en los patrones (estructura y distribución espacial) y tipo de vegetación resultantes de la intensificación de los usos del suelo causarán alteraciones en las condiciones microclimáticas (temperatura y humedad del suelo) y en las características del...

  3. Millennium Ecosystem Assessment: MA Population

    Data.gov (United States)

    National Aeronautics and Space Administration — The Millennium Ecosystem Assessment: MA Population data sets provide baseline population information as one of the drivers of ecosystem change. The data helped in...

  4. Economic viewpoints on ecosystem services

    NARCIS (Netherlands)

    Silvis, H.J.; Heide, van der C.M.

    2013-01-01

    to help determine the different values of ecosystems. Ecosystem services are usually divided into four categories: provisioning services, regulating services, cultural services and habitat services (previously denoted as supporting services). This overview highlights economic theories about

  5. Interregional flows of ecosystem services

    NARCIS (Netherlands)

    Schröter, Matthias; Koellner, Thomas; Alkemade, Rob; Arnhold, Sebastian; Bagstad, Kenneth J.; Erb, Karl Heinz; Frank, Karin; Kastner, Thomas; Kissinger, Meidad; Liu, Jianguo; López-Hoffman, Laura; Maes, Joachim; Marques, Alexandra; Martín-López, Berta; Meyer, Carsten; Schulp, Catharina J.E.; Thober, Jule; Wolff, Sarah; Bonn, Aletta

    2018-01-01

    Conserving and managing global natural capital requires an understanding of the complexity of flows of ecosystem services across geographic boundaries. Failing to understand and to incorporate these flows into national and international ecosystem assessments leads to incomplete and potentially

  6. del alcoholismo

    Directory of Open Access Journals (Sweden)

    Rodrigo Arias Duque

    2005-01-01

    Full Text Available Desde el punto de vista farmacológico, es importante comprender qué es el alcohol y cómo actúa en el organismo. No existe una causa simple, sino una interacción complicada de factores neuroquímicos, fisiológicos, psicológicos y sociales que originan y desarrollan esta grave enfermedad fármaco-dependiente. La acción psicofisiológica y farmacodinámica del alcohol es fundamentalmente depresiva, por la reducción de la transmisión sináptica en el sistema nervioso humano. Es un hecho conocido que el consumo excesivo de alcohol causa una disfunción aguda y crónica del cerebro, produciendo trastornos en el sistema nervioso central, presentando alteraciones en la memoria y en las funciones intelectuales como cálculo, comprensión y aprendizaje. A nivel hepático tiene lugar, en su mayoría, el metabolismo del alcohol, produciéndose un hígado graso alcohólico, aumentando el tamaño, terminando en necrosis e inflamación grave del hígado; esto se llama hepatitis alcohólica, y si se sigue consumiendo alcohol se desarrollará la cirrosis. El alcohol también ha estado relacionado con alteraciones del miocardio; se ha constatado en animales de experimentación sanos que tanto la velocidad de contracción del músculo cardiaco y su máxima tensión disminuyen en presencia del alcohol, como consecuencia, la fuerza de cada contracción y el aumento de presión en el ventrículo izquierdo son menores, perdiendo eficacia el corazón como bomba.

  7. Preface: Ecosystem services, ecosystem health and human communities

    Science.gov (United States)

    Plag, Hans-Peter

    2018-04-01

    This special issue contains a collection of manuscripts that were originally intended to be included in the special issue on "Physics and Economics of Ecosystem Services Flows" (Volume 101, guest editors H. Su, J. Dong and S. Nagarajan) and "Biogeochemical Processes in the Changing Wetland Environment" (Volume 103, guest editors J. Bai, L. Huang and H. Gao). All of them are addressing issues related to ecosystem services in different settings. Ecosystem services are of high value for both the ecosystems and human communities, and understanding the impacts of environmental processes and human activities on ecosystems is of fundamental importance for the preservation of these services.

  8. Promoting Transfer of Ecosystems Concepts

    Science.gov (United States)

    Yu, Yawen; Hmelo-Silver, Cindy E.; Jordan, Rebecca; Eberbach, Catherine; Sinha, Suparna

    2016-01-01

    This study examines to what extent students transferred their knowledge from a familiar aquatic ecosystem to an unfamiliar rainforest ecosystem after participating in a technology-rich inquiry curriculum. We coded students' drawings for components of important ecosystems concepts at pre- and posttest. Our analysis examined the extent to which each…

  9. The Coevolution of Digital Ecosystems

    Science.gov (United States)

    SungYong, Um

    2016-01-01

    Digital ecosystems are one of the most important strategic issues in the current digital economy. Digital ecosystems are dynamic and generative. They evolve as new firms join and as heterogeneous systems are integrated into other systems. These features digital ecosystems determine economic and technological success in the competition among…

  10. Diversidad taxonómica y denso-actividad de solífugos (Arachnida: Solifugae asociados a un ecosistema desértico costero del centro norte de Chile Taxonomic diversity and density-activity of solpugids (Arachnida: Solifugae in a coastal desert ecosystem in the northern centre of Chile

    Directory of Open Access Journals (Sweden)

    Daniel E. Valdivia

    2008-06-01

    Full Text Available En Chile, el orden Solifugae está representado por 14 especies agrupadas en 10 géneros, distribuidos en las tres familias descritas en Sudamérica: Ammotrechidae, Mummuciidae y Daesiidae. En el presente trabajo se documenta la composición genérica y/o específica de solífugos asociados a un ecosistema desértico costero del centro norte de Chile, y se muestran las variaciones de su denso-actividad. El estudio se realizó en el sector costero de Punta de Choros (29°21'S, 71°10'O; 17 msnm, durante los meses de junio, agosto, octubre y noviembre de 2005. Entre los 249 ejemplares capturados, se reconoció la presencia de tres familias, cuatro géneros y cinco especies. Éstas fueron Procleobis sp., Sedna pirata Muma (Ammotrechidae, Mummucia sp., Mummucia variegata (Gervais (Mummuciidae y Ammotrechelis goetschi Roewer (Daesiidae. La mayor denso-actividad de solífugos se registró en los meses de octubre, 5 especies (ca 30 % del total capturado; y noviembre, 3 especies (ca 41 % del total capturado. Mientras que algunas especies se mostraron activas durante todo el período de estudio (e.g., Ammotrechelis goetschi, otras presentaron actividad parcial. Por ejemplo, Mummucia variegata manifestó actividad entre agosto y noviembre; Sedna pirata entre octubre y noviembre y tanto Procleobis sp. como Mummucia sp. estuvieron activas sólo en octubre. La diversidad y la denso-actividad de Solifugae estarían determinadas por factores biológicos y ecológicos.In Chile the order Solifugae is represented by 14 species arranged in 10 genera distributed among the three families described for South America: Ammotrechidae, Mummuciidae and Daesiidae. The present work documents the taxonomic composition of solpugids in a desert coastal ecosystem of the northern centre of Chile and describes variation in their density-activity. The study was carried out in the coastal sector of Punta de Choros (29°21'S, 71°10'W; 17 masl during June, August, October and

  11. Marine Ecosystem Services

    DEFF Research Database (Denmark)

    Hasler, Berit; Ahtiainen, Heini; Hasselström, Linus

    MARECOS (Marine Ecosystem Services) er et tværfagligt studie, der har haft til formål at tilvejebringe information vedrørende kortlægning og værdisætning af økosystemtjenester, som kan anvendes i forbindelse med udformning af regulering på det marine område såvel nationalt, som regionalt og inter...

  12. Comedia y Barroco. Narrativas del cuerpo en los círculos teatrales libertinos

    Directory of Open Access Journals (Sweden)

    Walter Nelson Musich

    2012-07-01

    Full Text Available Nuestro análisis se centrará en las narrativas del cuerpo que se dejan entrever en dos producciones teatrales cómicas: en Le pédant joué (1654 de Cyrano de Bergerac y en Le malade imaginaire (1673 de Molière. Habiendo seleccionado el género cómico-satírico por su carácter irreverente que solapa bajo la risa la crítica (y en ella otra retórica sobre los cuerpos y escogiendo esta dupla de dramaturgos debido a su, reiteradamente marcada, pertenencia al grupo de los libertinos o librepensadores. La presente investigación parte de pensar que las condiciones políticas en las que se escribieron las piezas teatrales (fines inmediatos de la Fronda y plena consolidación del modelo absolutista con Luis XIV conjugadas con la peculiar construcción de la mirada de estos dramaturgos libertinos, como capaces de hablar desde una presunta lejanía y en algunos casos neutralidad, nos posibilitan encontrar otras contemplaciones y concepciones sobre los cuerpos en su proceso de producción social. Concepciones que en medio de una época marcada a fuego por la pertenencia estamentaria (estamentos en pleno proceso de redelimitación se organizan en narrativas y críticas sociopolíticas, inaugurando una proto-sociología.

  13. The river ecosystem

    International Nuclear Information System (INIS)

    Descy, J.P.; Lambinon, J.

    1984-01-01

    From the standpoint of the ecologist, a river is an ecosystem characterized by its biocoenosis, in dynamic equilibrium with the abiotic environment. This ecosystem can be envisaged at the structural level by examining its physical, chemical and biological properties, together with the relationships existing between these compartments. The biocoenotic structure of a river is relatively complex: it manifests, among other specific features, the presence of plankton communities which show marked space-time variations. The function of the river ecosystem can be approximated by a study of the relationships between the biotic and abiotic components: primary production, secondary production, recycling of organic matter, etc. Lotic environments are subject to frequent disturbance from various forms of man-made pollution: organic pollution, eutrophization, thermal pollution, mineral pollution, contamination by organic and mineral micropollutants, as well as by radionuclides, mechanical pollution and physical degradation. The biocoenotic effects of these forms of pollution may be evaluated, in particular, using biological indicators (bioindicators): these are either able to show the overall impact of the pollution on the biocoenosis or else they permit the detection and evaluation of certain pollutant forms. (author)

  14. Characterizing the Danish telemedicine ecosystem

    DEFF Research Database (Denmark)

    Manikas, Konstantinos; Hansen, Klaus Marius

    2013-01-01

    and interoperability issues, silo solutions, and lack of guidelines and standards. In this paper, we characterise the ecosystem evolved around the telemedicine services in Denmark and study the actors involved in this ecosystem. We establish a method for this study, where we define two actor roles and ways...... of characterizing actor contributions, and apply the method to the largest healthcare region of Denmark. Our findings reveal an ecosystem that is relatively closed to new actors, where the actors tend to be related to single telemedicine applications, the applications have low connectivity, and the most influential...... actors of the ecosystem can be characterised as both being beneficial and inhibitory to the ecosystem prosperity....

  15. Presentación del Libro “Tres Médicos Árabes” Rhases, Averroes, Avicena

    Directory of Open Access Journals (Sweden)

    Efraim Otero Ruiz

    2007-12-01

    Pero esa misma migratoriedad, especialmente de las del norte, hizo que gradualmente se extendieran por Siria, Mesopotamia y por todo el antiguo imperio Persa hasta la India, por el oriente; y por Egipto y la costa norte del Africa hasta Gibraltar, por el occidente. Unidos por lenguajes ancestrales derivados del sumerio, el babilonio, el sánscrito y el urdu, que dieron origen al idioma árabe, en esas regiones había enclaves de muchas tribus y muchas religiones, mono y politeístas. El genio de Mahoma y su Corán fue el unificarlos monoteísticamente y darles un sentido de trascendencia, en esta vida y en la otra. Por eso, en el milenio que nos ocupa, se cumplió lo que después describiría maravillosamente Carlyle, el pensador inglés: Aquella estirpe, polvo inflamable por mucho tiempo aislado en el desierto, de golpe prendió fuego y sus llamas formidables se elevaron al cielo desde Dehli, en la India, hasta Granada en España...

  16. Ecosystem Management. A Management View

    DEFF Research Database (Denmark)

    Ravn-Jonsen, Lars

    The need for management of the marine ecosystem using a broad perspective has been recommended under a variety of names. This paper uses the term Ecosystem Management, which is seen as a convergence between the ecological idea of an organisational hierarchy and the idea of strategic planning...... with a planning hierarchy---with the ecosystem being the strategic planning level. Management planning requires, in order to establish a quantifiable means and ends chain, that the goals at the ecosystem level can be linked to operational levels; ecosystem properties must therefore be reducible to lower...... organisational levels. Emergence caused by constraints at both the component and system levels gives rise to phenomena that can create links between the ecosystem and operational levels. To create these links, the ecosystem's functional elements must be grouped according to their functionality, ignoring any...

  17. Ecosystem-based management and the wealth of ecosystems

    Science.gov (United States)

    Yun, Seong Do; Hutniczak, Barbara; Abbott, Joshua K.; Fenichel, Eli P.

    2017-01-01

    We merge inclusive wealth theory with ecosystem-based management (EBM) to address two challenges in the science of sustainable management of ecosystems. First, we generalize natural capital theory to approximate realized shadow prices for multiple interacting natural capital stocks (species) making up an ecosystem. These prices enable ecosystem components to be better included in wealth-based sustainability measures. We show that ecosystems are best envisioned as portfolios of assets, where the portfolio’s performance depends on the performance of the underlying assets influenced by their interactions. Second, changes in ecosystem wealth provide an attractive headline index for EBM, regardless of whether ecosystem wealth is ultimately included in a broader wealth index. We apply our approach to the Baltic Sea ecosystem, focusing on the interacting community of three commercially important fish species: cod, herring, and sprat. Our results incorporate supporting services embodied in the shadow price of a species through its trophic interactions. Prey fish have greater shadow prices than expected based on market value, and predatory fish have lower shadow prices than expected based on market value. These results are because correctly measured shadow prices reflect interdependence and limits to substitution. We project that ecosystem wealth in the Baltic Sea fishery ecosystem generally increases conditional on the EBM-inspired multispecies maximum sustainable yield management beginning in 2017, whereas continuing the current single-species management generally results in declining wealth. PMID:28588145

  18. Ecosystem-based management and the wealth of ecosystems.

    Science.gov (United States)

    Yun, Seong Do; Hutniczak, Barbara; Abbott, Joshua K; Fenichel, Eli P

    2017-06-20

    We merge inclusive wealth theory with ecosystem-based management (EBM) to address two challenges in the science of sustainable management of ecosystems. First, we generalize natural capital theory to approximate realized shadow prices for multiple interacting natural capital stocks (species) making up an ecosystem. These prices enable ecosystem components to be better included in wealth-based sustainability measures. We show that ecosystems are best envisioned as portfolios of assets, where the portfolio's performance depends on the performance of the underlying assets influenced by their interactions. Second, changes in ecosystem wealth provide an attractive headline index for EBM, regardless of whether ecosystem wealth is ultimately included in a broader wealth index. We apply our approach to the Baltic Sea ecosystem, focusing on the interacting community of three commercially important fish species: cod, herring, and sprat. Our results incorporate supporting services embodied in the shadow price of a species through its trophic interactions. Prey fish have greater shadow prices than expected based on market value, and predatory fish have lower shadow prices than expected based on market value. These results are because correctly measured shadow prices reflect interdependence and limits to substitution. We project that ecosystem wealth in the Baltic Sea fishery ecosystem generally increases conditional on the EBM-inspired multispecies maximum sustainable yield management beginning in 2017, whereas continuing the current single-species management generally results in declining wealth.

  19. Culturas del Mundo

    DEFF Research Database (Denmark)

    Benwell, Ann Fenger; Costa, Alberto; Waehle, Espen

    2006-01-01

    ’Culturas del mundo. Colecciones del Museo Nacional de Dinamarca’ with Ann Fenger Benwell in Culturas del Mundo. Colecciones del Museo Nacional de Dinamarca, ed. Silvia Sauquet, Fundación "la Caixa", Barcelona 2006, pp. 31-39......’Culturas del mundo. Colecciones del Museo Nacional de Dinamarca’ with Ann Fenger Benwell in Culturas del Mundo. Colecciones del Museo Nacional de Dinamarca, ed. Silvia Sauquet, Fundación "la Caixa", Barcelona 2006, pp. 31-39...

  20. Effects of a large scale nitrogen and phosphorous fertilization on the ecosystem functioning of a Mediterranean tree-grass ecosystem

    Science.gov (United States)

    Migliavacca, Mirco; El Madany, Tarek; Perez-Priego, Oscar; Carrara, Arnaud; Hammer, Tiana; Henkel, Kathin; Kolle, Olaf; Luo, Yunpeng; Moreno, Gerardo; Morris, Kendalynn; Nair, Richard; Schrumpf, Marion; Wutzler, Thomas; Reichstein, Markus

    2017-04-01

    Recent studies have shown how human induced N/P imbalances affect essential ecosystem processes, and might be particularly important in water-limited ecosystems. In this contribution we will present results from an ecosystem scale nutrient manipulation experiment on a Mediterranean tree-grass ecosystem (Majadas del Tietar, Spain). Specifically, we will show how ecosystem functioning (e.g. light use efficiency, water use efficiency - WUE, albedo) changes as consequence of N and NP fertilization. A cluster of eddy covariance (EC) flux towers has been set up beside a long-term EC site (Control site) to measured high temporal resolution C and water fluxes between the ecosystem and the atmosphere. The sites were selected in a way to have similar pre-treatment conditions. Two out of three EC footprint areas (18 Ha) were fertilized with N and NP at the beginning of 2015 and 2016. To interpret the variations in C and water fluxes measured with the EC systems we monitored spatial and temporal variations in phenology, plant traits, species richness, and tree transpiration by using sap-flow meters, digital repeat photography, as well as soil sampling. The results show a consistent increase ( 15% compared to the Control site) in net ecosystem production (NEP) observed both in the N and the NP treatments. An increase of evapotranspiration (ET) of about 15% and 10% is observed in the N and NP site, respectively, indicating an increase of WUE in the NP treatment. The partitioning of the NEP into its gross components, the gross primary production (GPP) and the total ecosystem respiration (TER), show that the fertilization stimulated more GPP rather than TER, increasing therefore the capability of the ecosystem to act as carbon sink. The effects of fertilization are pronounced in spring and autumn and negligible in summer. This indicates that grass reacted much more than trees to N and NP addition. An increase of greenness and also an earlier green-up of grass in the N and NP sites

  1. La verificación internacional: condición decisiva en la solución negociada del conflicto armado colombiano

    Directory of Open Access Journals (Sweden)

    Paula Bejarano Mahecha

    2017-11-01

    Full Text Available Históricamente, las causas del fracaso de las negociaciones de paz entre el Gobierno nacional y las farc-ep han sido la imposibilidad de superar la enorme desconfianza entre las partes y el uso táctico dado a las negociaciones en el pasado. Sin embargo, y a partir del marco de análisis propuesto por Bárbara Walter (1997, el éxito de las negociaciones adelantadas en el Gobierno del presidente Juan Manuel Santos Calderón con las farc-ep puede atribuirse a la participación de la Organización de las Naciones Unidas (ONU en la coordinación del Mecanismo de Monitoreo y Verificación para el Acuerdo de Cese al Fuego y de Hostilidades Bilateral y Definitivo, y como una instancia de verificación de la dejación de armas por parte de la guerrilla.

  2. Sustainable web ecosystem design

    CERN Document Server

    O'Toole, Greg

    2013-01-01

    This book is about the process of creating web-based systems (i.e., websites, content, etc.) that consider each of the parts, the modules, the organisms - binary or otherwise - that make up a balanced, sustainable web ecosystem. In the current media-rich environment, a website is more than a collection of relative html documents of text and images on a static desktop computer monitor. There is now an unlimited combination of screens, devices, platforms, browsers, locations, versions, users, and exabytes of data with which to interact. Written in a highly approachable, practical style, this boo

  3. NUEVAS EVIDENCIAS SOBRE LA EDAD DE ABANDONO DEL SITIO ARQUEOLÓGICO PLAZUELAS (GUANAJUATO, MÉXICO MEDIANTE LA DATACIÓN ARQUEOMAGNÉTICA DE UN PISO QUEMADO (New Evidence of the Date of Abandonment of the Plazuelas Archaeological Site in Guanajuato, Mexico through Archaeomagnetic Dating of a Burned Floor

    Directory of Open Access Journals (Sweden)

    Juan Morales

    2015-10-01

    Full Text Available Se presentan los resultados de la datación arqueomagnética de un piso quemado del sitio arqueológico Plazuelas, Guanajuato. La carencia de una datación para la edad de abandono del sitio, detallada en relatos etnohistóricos, así como de carbón asociado a esta etapa, motivó la aplicación de un método alternativo de datación, independiente de los métodos tradicionales. La edad obtenida en este estudio, como la más probable para la última exposición al fuego del piso analizado, es bastante congruente con las evidencias arqueológicas disponibles para el sitio Plazuelas. Difícilmente una exposición posterior al fuego (ya sea de origen natural o provocada por el hombre daría como resultado una combinación de valores para los tres parámetros magnéticos determinados que convergieran en el intervalo de edad estimado para el abandono del sitio en cuestión. ENGLISH: The results of the archaeomagnetic dating of a burned floor from the archaeological site Plazuelas, Guanajuato, Mexico, are presented. The lack of an absolute date for the age of abandonment of the site, which is detailed in ethnohistorical accounts, as well as the lack of carbon remains conclusively associated with this stage, led to the implementation of an alternative method. The age obtained in this study, most likely representing the floor’s last exposure to fire, is quite consistent with the available archaeological evidence for the site’s date of abandonment. A subsequent exposure to fire (either natural or anthropogenic would not likely yield a combination of three magnetic parameters that would converge around the estimated period of abandonment of the site under study.

  4. Radio-capacity of ecosystems

    International Nuclear Information System (INIS)

    Kultakhmedov, Yu.; Kultakhmedova-Vyshnyakova, V.

    1997-01-01

    This paper consider a universal approach to ecosystems of different types, based on representation of their radio-capacity. The concept of ecosystem includes reproduction of components (bio-productivity) and conditions such as maintaining of environment quality. Radio-capacity in the case of radionuclide pollution appears in accumulation and redistribution of radionuclides in the ecosystem. As a result the radionuclides are redistributed and buried in soil or lake bottom sediments. Estimation models for the radio-capacity of water and terrestrial ecosystems are represented. The calculations of the radio-capacity factor of water ecosystems are performed, and the high radio-capacity of a freshwater reservoir (F=0.6-0.8) and extremely high radio-capacity of a reservoir cascade (F c =0.99) is shown material from the Dnieper's cascade reservoirs. The methods of radio-capacity estimation of agroecosystems, wood and marine ecosystems are developed. (authors)

  5. Espejel Carvajal Claudia, La justicia y el fuego. Dos claves para leer la Relación de Michoacán

    OpenAIRE

    Michelet, Dominique

    2014-01-01

    Il est des ouvrages sur lesquels il n’est jamais trop tard pour attirer l’attention des lecteurs, au-delà des cercles des spécialistes qui, eux, en connaissent ou, au moins, en supputent les mérites dès avant leur parution. Tel est le cas de cette somme que Claudia Espejel a su tirer de sa thèse de doctorat, soutenue en 2004 au Centre d’études historiques du Colegio de Michoacán. La Relación de Michoacán – ou, plus exactement, la Relación de las cerimonias y rictos y población y gobernación d...

  6. Ecosystem services for energy security

    Energy Technology Data Exchange (ETDEWEB)

    Athanas, Andrea; McCormick, Nadine

    2010-09-15

    The world is at an energy crossroads. The changes underway will have implications for ecosystems and livelihoods. Energy security is the reliable supply of affordable energy, of which there are two dimensions; reliability and resilience. Changes in ecosystem services linked to degradation and climate change have the potential to impact both on the reliabiity of energy systems and on their resiliance. Investing in ecosystems can help safeguard energy systems, and mitigate unforeseen risks to energy security. The energy and conservation community should come together to build reliable and resilliant energy systems in ways which recognise and value supporting ecosystems.

  7. Millennium Ecosystem Assessment: MA Biodiversity

    Data.gov (United States)

    National Aeronautics and Space Administration — The Millennium Ecosystem Assessment: MA Biodiversity provides data and information on amphibians, disease agents (extent and distribution of infectious and parasitic...

  8. Microbial biodiversity of Sardinian oleic ecosystems.

    Science.gov (United States)

    Santona, Mario; Sanna, Maria Lina; Multineddu, Chiara; Fancello, Francesco; de la Fuente, Sara Audije; Dettori, Sandro; Zara, Severino

    2018-04-01

    The olives are rich in microorganisms that, during the extraction process may persist in the oils and can influence their physicochemical and sensory characteristics. In this work, and for the first time, we isolated and identified microbial species, yeast and bacteria, present during the production process in four Sardinian (Italy) oleic ecosystems. Among these varieties, we found that Nera di Gonnos was associated to the highest microbial biodiversity, which was followed by Bosana, Nocellara del Belice and Semidana. Among the different microbial species isolated, some are specific of olive ecological niches, such as Cryptococcus spp and Serratia spp; and others to olive oils such as Candida spp and Saccharomyces. Some other species identified in this work were not found before in oleic ecosystems. The enzymatic analyses of yeast and bacteria showed that they have good β-glucosidase activity and yeast also showed good β-glucanase activity. The majority of bacteria presented lipolytic and catalase activities while in yeast were species-specific. Interestingly, yeast and bacteria isolates presented a high resistance to bile acid, and about 65% of the yeast were able to resist at pH 2.5 for 2 h. Finally, bacteria showed no biofilm activity compared to yeast. Copyright © 2017 Elsevier Ltd. All rights reserved.

  9. Mercury in Nordic ecosystems

    Energy Technology Data Exchange (ETDEWEB)

    Munthe, John; Waengberg, Ingvar (IVL Swedish Environmental Research Inst., Stockholm (SE)); Rognerud, Sigurd; Fjeld, Eirik (Norwegian Inst. for Water Research (NIVA), Oslo (Norway)); Verta, Matti; Porvari, Petri (Finnish Environment Inst. (SYKE), Helsinki (Finland)); Meili, Markus (Inst. of Applied Environmental Research (ITM), Stockholm (Sweden))

    2007-12-15

    This report provides a first comprehensive compilation and assessment of available data on mercury in air, precipitation, sediments and fish in the Nordic countries. The main conclusion is that mercury levels in Nordic ecosystems continue to be affected by long-range atmospheric transport. The geographical patterns of mercury concentrations in both sediments and fish are also strongly affected by ecosystem characteristics and in some regions possibly by historical pollution. An evaluation of geographical variations in mercury concentrations in precipitation indicates that the influence from anthropogenic sources from Central European areas is still significant. The annual variability of deposition is large and dependant of precipitation amounts. An evaluation of data from stations around the North Sea has indicated a significant decrease in mercury concentrations in precipitation indicating a continuous decrease of emissions in Europe (Waengberg et al., 2007). For mercury in air (TGM), the geographical pattern is less pronounced indicating the influence of mercury emissions and distribution over a larger geographical area (i.e. hemispherical transport). Comparison of recent (surficial) and historical lake sediments show significantly elevated concentrations of mercury most likely caused by anthropogenic atmospheric deposition over the past century. The highest pollution impact was observed in the coastal areas of southern Norway, in south western Finland and in Sweden from the coastal areas in the southwest across the central parts to the north-east. The general increase in recent versus old sediments was 2-5 fold. Data on mercury in Nordic freshwater fish was assembled and evaluated with respect to geographical variations. The fish data were further compared with temporal and spatial trends in mercury deposition and mercury contamination of lake sediments in order to investigate the coupling between atmospheric transport and deposition of mercury and local mercury

  10. Appropriate experimental ecosystem warming methods by ecosystem, objective, and practicality

    Science.gov (United States)

    E.L. Aronson; S.G. McNulty

    2009-01-01

    The temperature of the Earth is rising, and is highly likely to continue to do so for the foreseeable future. The study of the effects of sustained heating on the ecosystems of the world is necessary so that wemight predict and respond to coming changes on both large and small spatial scales. To this end, ecosystem warming studies have...

  11. Ash in fire affected ecosystems

    Science.gov (United States)

    Pereira, Paulo; Jordan, Antonio; Cerda, Artemi; Martin, Deborah

    2015-04-01

    -263. Dlapa, P., Bodí, M.B., Mataix-Solera, J., Cerdà, A., Doerr, S.H., Organic matter and wettability characteristics of wildfire ash from Mediterranean conifer forests. Catena. doi:10.1016/j.catena.2014.06.018 Dorta Almenar, I., Navarro Rivero, F.J., Arbelo, C.D., Rodríguez, A., Notario del Pino, J., The temporal distribution of water-soluble nutrients from high mountain soils following a wildfire within legume scrubland of Tenerife, Canary Islands, Spain. Catena. Escuday, M., Arancibia-Miranda, N., Pizarro, C., Antilén, M., Effect of ash from forest fires on leaching in volcanic soils. Catena. doi:10.1016/j.catena.2014.08.006 León, J., Echeverría, M.T., Marti, C., Badía, D., Can ash control infiltration rate after burning? An example in burned calcareous and gypseous soils in the Ebro Basin (NE Spain). Catena. doi:10.1016/j.catena.2014.05.024 Lombao, A., Barreiro, A., Carballas, T., Fontúrbel, M.T., Martín, C., Vega, J.A., Fernández, C., Díaz-Raviña, M., 2014. Changes in soil properties after a wildfire in Fragas do Eume Natural Park (Galicia, NW Spain). Catena. doi:10.1016/j.catena.2014.08.007 Pereira, P., Jordan, A., Cerda, A., Martin, D. (2014) Editorial: The role of ash in fire-affected ecosystems, Catena (In press) doi:10.1016/j.catena.2014.11.016 Pereira, P., Úbeda, X., Martin, D., Mataix-Solera, J., Cerdà, A., Burguet, M. (2014a) Wildfire effects on extractable elements in ash from a Pinus pinaster forest in Portugal, Hydrological Processes, 28, 3681-3690. Pereira, P., Ubeda, X., Mataix-Solera, J., Oliva, M., Novara, A. (2014) Short-term spatio-temporal spring grassland fire effects on soil colour,organic matter and water repellency in Lithuania, Solid Earth, 5, 209-225. Silva, V., Pereira, J.S., Campos, I., Keizer, J.J., Gonçalves, F., Abrantes, N., Toxicity assessment of aqueous extracts of ash from forest fires. Catena doi:10.1016/j.catena.2014.06.021

  12. Radionuclides in forest ecosystems

    International Nuclear Information System (INIS)

    Strebl, F.; Bossew, P.; Kienzl, K.; Hiesel, E.

    2000-01-01

    Some regions within Austria were highly contaminated (> 50 kBq m -2 ) with radiocaesium by the deposition event following the Chernobyl reactor accident in 1986. Monitoring carried out by several Austrian institutions showed that in contrast to agricultural products radiocaesium levels in wild berries, mushrooms and game meat from forest ecosystems remained considerably higher over the years. To find reasons for this contrasting radioecological behavior and for the derivation of model input parameters, an extended study about the distribution of 137 Cs within three Austrian forest stands was carried out between 1987 and 1997. Results of this and subsequent studies are summarized and include the following ecosystem compartments: forest soils, litter, trees, bilberry, mushrooms, mosses, ferns, lichen, other vegetation, insects, small mammals, game animals and surface water. Besides the investigation of radioecological behavior an estimation of pool sizes and transfer rates as well as radioecological residence half times for 137 Cs in different forest species was used to compile a radiocaesium balance for the years 1988 and 1996. Soil proved to be an effective sink for radiocaesium contamination, but in long-term perspective it can act as a source for the contamination of vegetation and higher levels of the food-chain as well. Due to the high standing biomass trees represent the largest 'living' radiocaesium pool within the investigated forest stand. Dose estimations based on average consume habits gave no significant increase (less than 0.4 %) of the annual average population radiation dose due to the ingestion of forest products from the investigated forest stands. (author)

  13. Using indicators and models for an ecosystem approach to fisheries and aquaculture management: the anchovy fishery and Pacific oyster culture in Chile: case studies Aplicación de indicadores y modelos para un enfoque ecosistémico de la pesca y la acuicultura: pesquería de anchoveta y cultivo de ostra del Pacífico en Chile: casos de estudio

    Directory of Open Access Journals (Sweden)

    Claudio Silva

    2012-11-01

    Full Text Available This study illustrate the use of indicators and models to support the Ecosystem Approach to Fisheries and Aquaculture management using two case studies in Chile: prediction of environmental variability effects upon anchovy (Engraulis ringens fishery of northern Chile and prediction of suitable sites and carrying capacity of Pacific oyster (Crassostrea gigas culture using FARM and geographic information system (GIS models in the Valdivia estuary. A three stage approach was applied: Stage 1 considers spatiotemporal ecosystem indicators (fisheries, aquaculture, environmental, and regulatory, Stage 2 uses statistical relationships between indicators, GIS, and other simulation models (e.g., artificial neural networks and FARM of environment-resources interaction, and Stage 3 is the analysis and validation of models outputs. The methodology illustrates how indicators and models may be used to assist decision-makers in developing an ecosystem approach to fisheries and aquaculture. The application of these approaches provides an integrative methodology for abundance prediction of anchovy and site selection for shellfish aquaculture, despite limitations in the available data.Este trabajo muestra el uso de indicadores y modelos para apoyar la aplicación del enfoque ecosistémico en la gestión de la pesca y la acuicultura, mediante dos casos de estudios en Chile: predicción de los efectos de la variabilidad ambiental en la pesquería de anchoveta (Engraulis ringens en la zona norte de Chile y la predicción de sitios aptos y capacidad de carga para el cultivo de la ostra del Pacífico (Crassostrea gigas en el estuario de Valdivia. Se aplicó un enfoque metodológico de tres etapas: etapa 1 considera indicadores espacio-temporales del ecosistema (pesca, acuicultura, medio ambiente y legislación; etapa 2 utiliza relaciones estadísticas entre los indicadores, funciones de SIG (Sistemas de Información Geográfica, y otros modelos de simulación (Redes

  14. Risk of fire and dust explosions analysis in thermal Power station of ''As Pontes''; Analisis del Riesgo de fuego y Explosion en la Central Termica As Pontes

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-07-01

    Among the numerous difficulties come up in the industrial processes that operate with coal, the handling of combustible solids constitutes a priority objective because of the potential risk of fire and dust explosions that implies. The aim of this project was to determine the coal usage conditions that assure total safety in its manipulation avoiding every risks at the Thermal Power Station. Several variables had to be considered starting with the basis concept of coal, which ranges very different types, compositions and origins and studying the coal handling and operation condition on different areas in the Thermal Power Station. (Author)

  15. Understanding the mobile money ecosystem

    DEFF Research Database (Denmark)

    Tobbin, P.

    2011-01-01

    This paper discusses the structure of the new mobile money ecosystem and the roles of its key players. Mobile money is an evolving sector both in volume and in economic impact especially in the developing world. The paper is an exploratory study that investigates the structure of the ecosystem, p...

  16. Towards ecosystem-based management

    NARCIS (Netherlands)

    Tam, Jamie C.; Link, Jason S.; Rossberg, Axel G.; Rogers, Stuart I.; Levin, Philip S.; Rochet, Marie-Joelle; Bundy, Alida; Belgrano, Andrea; Libralato, Simone; Tomczak, Maciej; Wolfshaar, van de K.E.; Pranovi, Fabio; Gorokhova, Elena; Large, Scott I.; Niquil, Nathalie; Greenstreet, Simon P.R.; Druon, Jean-Noel; Lesutiene, Jurate; Johansen, Marie; Preciado, Izaskun; Patricio, Joana; Palialexis, Andreas; Tett, Paul; Johansen, Geir O.; Houle, Jennifer; Rindorf, Anna

    2017-01-01

    Modern approaches to Ecosystem-Based Management and sustainable use of marine resources must account for the myriad of pressures (interspecies, human and environmental) affecting marine ecosystems. The network of feeding interactions between co-existing species and populations (food webs) are an

  17. Ecology in Small Aquatic Ecosystems

    DEFF Research Database (Denmark)

    Andersen, Mikkel René

    Small ecosystems are many-fold more abundant than their larger counterparts. Both on regional and global scale small lakes outnumber medium and large lakes and account for a much larger surface area. Small streams are also far more common than rivers. Despite their abundance small ecosystems are ...

  18. Bottomland Hardwood Ecosystem Management Project

    Science.gov (United States)

    John A. Stanturf; Calvin E. Meier

    1994-01-01

    Federal agency approaches to land management are undergoing a shift from parcel-specific concerns toward a more holistic, ecosystem management approach. Southern bottomland hardwood ecosystems provide important environmental services and commodity goods (Wharton et al. 1982), yet much of our knowledge of these systems comes from anecdotal information. The Bottomland...

  19. Carbon allocation in forest ecosystems

    Science.gov (United States)

    Creighton M. Litton; James W. Raich; Michael G. Ryan

    2007-01-01

    Carbon allocation plays a critical role in forest ecosystem carbon cycling. We reviewed existing literature and compiled annual carbon budgets for forest ecosystems to test a series of hypotheses addressing the patterns, plasticity, and limits of three components of allocation: biomass, the amount of material present; flux, the flow of carbon to a component per unit...

  20. Challenges in software ecosystems research

    NARCIS (Netherlands)

    Serebrenik, A.; Mens, T.; Crnkovic, I.

    2015-01-01

    The paper is a meta-analysis of the research field of software ecosystems, by method of surveying 26 authors in the field. It presents a relevant list of literature and six themes in which challenges for software ecosystems can be grouped: Architecture and Design, Governance, Dynamics and Evolution,

  1. Forest Ecosystem services: Water resources

    Science.gov (United States)

    Thomas P. Holmes; James Vose; Travis Warziniack; Bill Holman

    2017-01-01

    Since the publication of the Millennium Ecosystem Assessment (MEA 2005), awareness has steadily grown regarding the importance of maintaining natural capital. Forest vegetation is a valuable source of natural capital, and the regulation of water quantity and quality is among the most important forest ecosystem services in many regions around the world. Changes in...

  2. An Indicator for ecosystem externalities in fishing

    DEFF Research Database (Denmark)

    Ravn-Jonsen, Lars; Andersen, Ken Haste; Vestergaard, Niels

    Ecosystem externalities arise when one use of an ecosystem affects its other uses through the production functions of the ecosystem.We use simulations from a size-spectrum ecosystem model to investigate the ecosystem externality created by fishing of multiple species. The model is based upon...

  3. Ecosystem Services : In Nordic Freshwater Management

    DEFF Research Database (Denmark)

    Magnussen, Kristin; Hasler, Berit; Zandersen, Marianne

    Human wellbeing is dependent upon and benefit from ecosystem services which are delivered by well-functioning ecosystems. Ecosystem services can be mapped and assessed consistently within an ecosystem service framework. This project aims to explore the use and usefulness of the ecosystem service ...

  4. Complex effects of ecosystem engineer loss on benthic ecosystem response to detrital macroalgae

    NARCIS (Netherlands)

    Rossi, F.; Gribsholt, B.; Gazeau, F.; Di Santo, V.; Middelburg, J.J.

    2013-01-01

    Ecosystem engineers change abiotic conditions, community assembly and ecosystem functioning. Consequently, their loss may modify thresholds of ecosystem response to disturbance and undermine ecosystem stability. This study investigates how loss of the bioturbating lugworm Arenicola marina modifies

  5. Complex Effects of Ecosystem Engineer Loss on Benthic Ecosystem Response to Detrital Macroalgae

    NARCIS (Netherlands)

    Rossi, F.; Gribsholt, B.; Gazeau, F.; Di Santo, V.; Middelburg, J.J.

    2013-01-01

    Ecosystem engineers change abiotic conditions, community assembly and ecosystem functioning. Consequently, their loss may modify thresholds of ecosystem response to disturbance and undermine ecosystem stability. This study investigates how loss of the bioturbating lugworm Arenicola marina modifies

  6. Linking ecosystem characteristics to final ecosystem services for public policy

    Science.gov (United States)

    Wong, Christina P; Jiang, Bo; Kinzig, Ann P; Lee, Kai N; Ouyang, Zhiyun

    2015-01-01

    Governments worldwide are recognising ecosystem services as an approach to address sustainability challenges. Decision-makers need credible and legitimate measurements of ecosystem services to evaluate decisions for trade-offs to make wise choices. Managers lack these measurements because of a data gap linking ecosystem characteristics to final ecosystem services. The dominant method to address the data gap is benefit transfer using ecological data from one location to estimate ecosystem services at other locations with similar land cover. However, benefit transfer is only valid once the data gap is adequately resolved. Disciplinary frames separating ecology from economics and policy have resulted in confusion on concepts and methods preventing progress on the data gap. In this study, we present a 10-step approach to unify concepts, methods and data from the disparate disciplines to offer guidance on overcoming the data gap. We suggest: (1) estimate ecosystem characteristics using biophysical models, (2) identify final ecosystem services using endpoints and (3) connect them using ecological production functions to quantify biophysical trade-offs. The guidance is strategic for public policy because analysts need to be: (1) realistic when setting priorities, (2) attentive to timelines to acquire relevant data, given resources and (3) responsive to the needs of decision-makers. PMID:25394857

  7. Linking ecosystem characteristics to final ecosystem services for public policy.

    Science.gov (United States)

    Wong, Christina P; Jiang, Bo; Kinzig, Ann P; Lee, Kai N; Ouyang, Zhiyun

    2015-01-01

    Governments worldwide are recognising ecosystem services as an approach to address sustainability challenges. Decision-makers need credible and legitimate measurements of ecosystem services to evaluate decisions for trade-offs to make wise choices. Managers lack these measurements because of a data gap linking ecosystem characteristics to final ecosystem services. The dominant method to address the data gap is benefit transfer using ecological data from one location to estimate ecosystem services at other locations with similar land cover. However, benefit transfer is only valid once the data gap is adequately resolved. Disciplinary frames separating ecology from economics and policy have resulted in confusion on concepts and methods preventing progress on the data gap. In this study, we present a 10-step approach to unify concepts, methods and data from the disparate disciplines to offer guidance on overcoming the data gap. We suggest: (1) estimate ecosystem characteristics using biophysical models, (2) identify final ecosystem services using endpoints and (3) connect them using ecological production functions to quantify biophysical trade-offs. The guidance is strategic for public policy because analysts need to be: (1) realistic when setting priorities, (2) attentive to timelines to acquire relevant data, given resources and (3) responsive to the needs of decision-makers. © 2014 The Authors. Ecology Letters published by John Wiley & Sons Ltd and CNRS.

  8. Methodology for the study of the Mexican Volcanic Belt; Metodologia para el estudio del Cinturon Volcanico Mexicano

    Energy Technology Data Exchange (ETDEWEB)

    Pal Verma, Surendra [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1990-12-31

    The Mexican Volcanic Belt (MVB) is an structure 20 to 150 kilometers wide an {approx}1000 km long, oriented approximately east-west, from nearby Puerto Vallarta up until Veracruz; it contains a great number ({approx}7000) of volcanic apparatus or volcanic centers (Verma, 1987a, and the cited references in this paper). Fig. 1 represents the location of some of its main volcanic centers. The MVB forms part of the ring of fire that extends all along the circumpacific region (see Fig. 2) named this way because it refers to a very high volcanoes population (many of them active volcanoes), to its seismic activity and to the large geothermal manifestations. [Espanol] El Cinturon Volcanico Mexicano (CVM) es una estructura de 20 a 150 kilometros de ancho, {approx}1,000 km de largo, orientada aproximadamente este-oeste desde cerca de Puerto Vallarta hasta Veracruz; contiene gran numero ({approx}7,000) de aparatos o centros volcanicos (Verma, 1987a, y las referencias citadas en este trabajo). La figura 1 presenta la localizacion de algunos de sus principales centros volcanicos. El CVM forma parte del llamado anillo del fuego, que se extiende a todo lo largo de la region circumpacifica (vease la Fig. 2), denominada asi porque se trata de una poblacion muy alta de volcanes (mucho de ellos activos), de la actividad sismica y de grandes manifestaciones geotermicas.

  9. Methodology for the study of the Mexican Volcanic Belt; Metodologia para el estudio del Cinturon Volcanico Mexicano

    Energy Technology Data Exchange (ETDEWEB)

    Pal Verma, Surendra [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1991-12-31

    The Mexican Volcanic Belt (MVB) is an structure 20 to 150 kilometers wide an {approx}1000 km long, oriented approximately east-west, from nearby Puerto Vallarta up until Veracruz; it contains a great number ({approx}7000) of volcanic apparatus or volcanic centers (Verma, 1987a, and the cited references in this paper). Fig. 1 represents the location of some of its main volcanic centers. The MVB forms part of the ring of fire that extends all along the circumpacific region (see Fig. 2) named this way because it refers to a very high volcanoes population (many of them active volcanoes), to its seismic activity and to the large geothermal manifestations. [Espanol] El Cinturon Volcanico Mexicano (CVM) es una estructura de 20 a 150 kilometros de ancho, {approx}1,000 km de largo, orientada aproximadamente este-oeste desde cerca de Puerto Vallarta hasta Veracruz; contiene gran numero ({approx}7,000) de aparatos o centros volcanicos (Verma, 1987a, y las referencias citadas en este trabajo). La figura 1 presenta la localizacion de algunos de sus principales centros volcanicos. El CVM forma parte del llamado anillo del fuego, que se extiende a todo lo largo de la region circumpacifica (vease la Fig. 2), denominada asi porque se trata de una poblacion muy alta de volcanes (mucho de ellos activos), de la actividad sismica y de grandes manifestaciones geotermicas.

  10. Il dono del racconto

    DEFF Research Database (Denmark)

    Polito, Paola

    1998-01-01

    L'articolo indaga a vari livelli strutturali del romanzo "Il coraggio del pettirosso" (rete metaforica, dialogismo diegetico, dialogismo come fenomeno di voce, strategie discorsive messe in atto dalla voce narrante, stile colloquiale) la complessa realizzazione testuale del genere narrativo...

  11. Biodiversity, climate change, and ecosystem services

    CSIR Research Space (South Africa)

    Mooney, H

    2009-08-01

    Full Text Available of ecosystems, deepen our understanding of the biological underpinnings for ecosystem service delivery and develop new tools and techniques for maintaining and restoring resilient biological and social systems. We will be building on an ecosystem foundation...

  12. Towards a consistent approach for ecosystem accounting

    NARCIS (Netherlands)

    Edens, B.; Hein, L.G.

    2013-01-01

    In spite of an increasing interest in environmental economic accounting, there is still very limited experience with the integration of ecosystem services and ecosystem capital in national accounts. This paper identifies four key methodological challenges in developing ecosystem accounts: the

  13. Radionuclides in terrestrial ecosystems

    International Nuclear Information System (INIS)

    Howard, B.J.; Kennedy, V.H.; Nelson, A.

    1983-06-01

    A bibliographical database has been developed to provide quick access to research and background literature in the field of radioecology. This is a development of an earlier database described by Nelson (Bocock 1981). ITE's particular fields of interest have led to a subject bias in the bibliography towards studies in Cumbria, especially those concerned with radionuclides originating from the reprocessing plant at Sellafield, and towards ecological research studies that are complementary to radionuclide studies. Other subjects covered, include the chemistry of radionuclides, budgets and transfers within ecosystems and techniques for the analysis of environmental samples. ITE's research objectives have led to the establishment of a specialized database which is intended to complement rather than compete with the large international databases made available by suppliers such as IRS-DIALTECH or DIALOG. Currently the database holds about 1900 references which are stored on a 2 1/2 megabyte hard disk on a Digital PDP11/34 computer operating under a time shared system. The references follow a standard format. (author)

  14. La cucharilla diatérmica en el tratamiento del cáncer

    Directory of Open Access Journals (Sweden)

    Roberto Restrepo

    1946-03-01

    Full Text Available Frecuentemente se halla el radioterapeuta con masas cancerosas ulceradas, focos de infección que le presentan dificultades para un tratamiento adecuado. Estas masas son a veces obstáculo para aplicaciones correctas de rayos X, porque la masa misma, por su espesor, impide el paso de muchas radiaciones cuando se usan rayos de larga longitud de onda. Así, para hacer llegar suficiente dosis a la parte central de un cáncer, como hay que irradiar también tejido sano en el margen, a este último llega una cantidad grande de radiaciones que ponen en peligro su integridad, cuando a la base del tumor sólo ha llegado uan parte insuficiente de radiaciones, que a veces no alcanza a ser cancericida, a menos que se acudiera al método de fuegos cruzados, que larga el tratamiento y expone a la superposición de campos con todos sus inconvenientes. Y cuando se usa un aparato de pasta con radio las dificultades son a veces de orden mecánico.

  15. Ecosystem overfishing in the ocean.

    Science.gov (United States)

    Coll, Marta; Libralato, Simone; Tudela, Sergi; Palomera, Isabel; Pranovi, Fabio

    2008-01-01

    Fisheries catches represent a net export of mass and energy that can no longer be used by trophic levels higher than those fished. Thus, exploitation implies a depletion of secondary production of higher trophic levels (here the production of mass and energy by herbivores and carnivores in the ecosystem) due to the removal of prey. The depletion of secondary production due to the export of biomass and energy through catches was recently formulated as a proxy for evaluating the ecosystem impacts of fishing-i.e., the level of ecosystem overfishing. Here we evaluate the historical and current risk of ecosystem overfishing at a global scale by quantifying the depletion of secondary production using the best available fisheries and ecological data (i.e., catch and primary production). Our results highlight an increasing trend in the number of unsustainable fisheries (i.e., an increase in the risk of ecosystem overfishing) from the 1950s to the 2000s, and illustrate the worldwide geographic expansion of overfishing. These results enable to assess when and where fishing became unsustainable at the ecosystem level. At present, total catch per capita from Large Marine Ecosystems is at least twice the value estimated to ensure fishing at moderate sustainable levels.

  16. Ecosystems science: Genes to landscapes

    Science.gov (United States)

    ,

    2018-05-09

    Bountiful fisheries, healthy and resilient wildlife, flourishing forests and vibrant grasslands are coveted resources that benefit all Americans. U.S. Geological Survey (USGS) science supports the conservation and management of the Nation’s fish and wildlife, and the landscapes they inhabit. Our biological resources—ecosystems and the wild things that live in them—are the foundation of our conservation heritage and an economic asset to current and future generations of Americans.The USGS Ecosystems Mission Area, the biological research arm of the Department of the Interior (DOI), provides science to help America achieve sustainable management and conservation of its biological resources. This work is done within the broader mission of the USGS—to serve the Nation with science that advances understanding of our natural resources, informs land and water stewardship, and helps safeguard communities from natural and environmental hazards. The Ecosystems Mission Area provides research, technical assistance, and education conducted by Cooperative Research Units and Science Centers located in nearly every State.The quality of life and economic strength in America hinges on healthy ecosystems that support living things and natural processes. Ecosystem science better enables society to understand how and why ecosystems change and to guide actions that can prevent damage to, and restore and sustain ecosystems. It is through this knowledge that informed decisions are made about natural resources that can enhance our Nation’s economic and environmental well-being.

  17. Ecosystem services provided by bats.

    Science.gov (United States)

    Kunz, Thomas H; Braun de Torrez, Elizabeth; Bauer, Dana; Lobova, Tatyana; Fleming, Theodore H

    2011-03-01

    Ecosystem services are the benefits obtained from the environment that increase human well-being. Economic valuation is conducted by measuring the human welfare gains or losses that result from changes in the provision of ecosystem services. Bats have long been postulated to play important roles in arthropod suppression, seed dispersal, and pollination; however, only recently have these ecosystem services begun to be thoroughly evaluated. Here, we review the available literature on the ecological and economic impact of ecosystem services provided by bats. We describe dietary preferences, foraging behaviors, adaptations, and phylogenetic histories of insectivorous, frugivorous, and nectarivorous bats worldwide in the context of their respective ecosystem services. For each trophic ensemble, we discuss the consequences of these ecological interactions on both natural and agricultural systems. Throughout this review, we highlight the research needed to fully determine the ecosystem services in question. Finally, we provide a comprehensive overview of economic valuation of ecosystem services. Unfortunately, few studies estimating the economic value of ecosystem services provided by bats have been conducted to date; however, we outline a framework that could be used in future studies to more fully address this question. Consumptive goods provided by bats, such as food and guano, are often exchanged in markets where the market price indicates an economic value. Nonmarket valuation methods can be used to estimate the economic value of nonconsumptive services, including inputs to agricultural production and recreational activities. Information on the ecological and economic value of ecosystem services provided by bats can be used to inform decisions regarding where and when to protect or restore bat populations and associated habitats, as well as to improve public perception of bats. © 2011 New York Academy of Sciences.

  18. Ecosystem Services: Benefits Supplied to Human Societies by Natural Ecosystems

    Science.gov (United States)

    The module provides a link to an article that is part of a series of articles in Issues in Ecology. This article discusses the many services an ecosystem provides in order to sustain and fulfill human needs.

  19. del cambio

    Directory of Open Access Journals (Sweden)

    Alejandro Canales

    2006-01-01

    Full Text Available El artículo analiza las propuestas y los compromisos en materia de cobertura y de financiamiento en el periodo 2000-2006. En particular, revisa las modificaciones y los ajustes de los tres principales documentos en los que se expresaron las iniciativas: el de la Asociación Nacional de Universidades e Instituciones de Educación Superior, el del equipo de la transición y el programa sectorial. Los resultados muestran que las cifras de atención a la demanda educativa e inversión quedaron lejos de las metas autoimpuestas por el gobierno federal y que será necesario realizar mayores esfuerzos para atender tales desafíos.

  20. Puako Ecosystem Model Output Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Coral reefs provide a wide range of ecosystem services that are valued differently by different users. Managers are challenged to comprehensively address the full...

  1. Soil-based ecosystem services

    DEFF Research Database (Denmark)

    Ghaley, Bhim Bahadur; Porter, John Roy; Sandhu, Harpinder S.

    2014-01-01

    Among the soil-based ecosystem services (ES), nutrient cycling and carbon sequestration have direct influence on the biogeochemical cycles and greenhouse gas emissions affecting provision of other ES that support human existence. We reviewed methods to assess the two key ES by identifying...... their strengths and weaknesses and have made suggestions for using appropriate methods for better understanding of the ecosystem functions for the provision of ES. Relevant papers for the review were chosen on the basis of (i) diversity of studies on the two key ES in different ecosystems, (ii) methodologies...... applied and (iii) detailed descriptions of the trial locations in terms of vegetation, soil type, location and climatic information. We concluded that (i) elemental stoichiometrical ratios could be a potential approach to assess the health of ecosystems in terms of provision of the two ES discussed, (ii...

  2. Mineral nutrients in mediterranean ecosystems

    CSIR Research Space (South Africa)

    Day, JA

    1983-06-01

    Full Text Available The notion of ecological convergence has influenced taxonomists and biogeographers since the development of ecology in the mid-nineteenth century. Our initial understanding of the ecosystems of the world resulted from plant geographers...

  3. Ecosystem overfishing in the ocean

    OpenAIRE

    Coll, M; Libralato, S; Tutela, S; Palomera, I; Pranovi, F.

    2008-01-01

    Fisheries catches represent a net export of mass and energy that can no longer be used by trophic levels higher than those fished. Thus, exploitation implies a depletion of secondary production of higher trophic levels (here the production of mass and energy by herbivores and carnivores in the ecosystem) due to the removal of prey. The depletion of secondary production due to the export of biomass and energy through catches was recently formulated as a proxy for evaluating the ecosystem impac...

  4. nitrogen saturation in stream ecosystems

    OpenAIRE

    Earl, S. R.; Valett, H. M.; Webster, J. R.

    2006-01-01

    The concept of nitrogen (N) saturation has organized the assessment of N loading in terrestrial ecosystems. Here we extend the concept to lotic ecosystems by coupling Michaelis-Menten kinetics and nutrient spiraling. We propose a series of saturation response types, which may be used to characterize the proximity of streams to N saturation. We conducted a series of short-term N releases using a tracer ((NO3)-N-15-N) to measure uptake. Experiments were conducted in streams spanning a gradient ...

  5. Cycling indices for ecosystem models

    International Nuclear Information System (INIS)

    Carney, J.H.; Gardner, R.H.; Mankin, J.B.; DeAngelis, D.L.

    1979-01-01

    The study of ecosystems is aided by representing structural and functional groups of organisms or processes as discrete components. A complex compartment model will explicitly map pathways from one compartment to another and specify transfer rates. This quantitative description allows insight into the dynamics of flow of nutrients, toxic chemicals, radionuclides, or energy. Three new indices that calculate compartment-specific probabilities of occurrence and recycling and illustrate the problem of applying these indices to ecosystem models are presented

  6. Interaction webs in arctic ecosystems

    DEFF Research Database (Denmark)

    Schmidt, Niels Martin; Hardwick, Bess; Gilg, Olivier

    2017-01-01

    How species interact modulate their dynamics, their response to environmental change, and ultimately the functioning and stability of entire communities. Work conducted at Zackenberg, Northeast Greenland, has changed our view on how networks of arctic biotic interactions are structured, how they ...... that the combination of long-term, ecosystem-based monitoring, and targeted research projects offers the most fruitful basis for understanding and predicting the future of arctic ecosystems....

  7. El efecto de las plantaciones forestales sobre el funcionamiento de los ecosistemas sudamericanos / The effect of tree plantations on south american ecosystems functioning

    Directory of Open Access Journals (Sweden)

    Germán Baldi

    2008-09-01

    Full Text Available El establecimiento de plantaciones forestales sobre áreas bajo vegetaciónoriginal o uso agrícolo-ganadero se expande en la mayoría de los países de Sudamérica, incentivado por los altos rendimientos, el apoyo fi scal y por el inminente comercio de bonos de carbono. En este trabajo se evaluócómo esta transformación afecta la producción de biomasa y la dinámicadel agua sintetizando información preexistente y original. Mediciones satelitales muestran que el “Índice de Vegetación de DiferenciasNormalizadas” (NDVI de las plantaciones forestales superó a la dela matriz del paisaje agrícolo-ganadera en todos los países y regiones ecológicas analizadas y –con excepción de los bosques valdivianos- a todos los tipos de vegetación original. A escala regional, este aumento enla productividad fue acompañado en el litoral del Río Uruguay por una mayor evapotranspiración y un menor rendimiento hidrológico que redujoa la mitad el caudal de cuencas forestadas, en acuerdo con lo observado en pastizales forestados de la región. Es apremiante generar informaciónacerca de otros impactos de las forestaciones tales como cambios en la dinámica del fuego y el avance de especies invasoras. Reconocer integralmente la infl uencia de las forestaciones sobre la producción de servicios y bienes permitirá plantear sistemas y políticas forestales más sustentables y útiles para la sociedad.

  8. La superaci??n del modelo del ??ngel del hogar:

    OpenAIRE

    Hurtado Mu??oz, M??nica

    2012-01-01

    La Tesis Doctoral titulada "La superaci??n del modelo del "??ngel del hogar". Recuperaci??n de la escritora Leonor Canalejas y Fustegueras (1869-1945)" aborda, en primer lugar, un an??lisis sociol??gico de las circunstancias que rodearon a la mujer espa??ola en el cambio de siglo en el ??mbito social y educativo, en un intento de esclarecer las caracter??sticas propias del contexto en el que la mujer accede a la intelectualidad en general y a la literatura en particular. Esta parte concluye q...

  9. Gonzalo Rojas: la infancia del poeta en Lebu. Una unidad didáctica por tareas

    Directory of Open Access Journals (Sweden)

    Puga Larraín, Juana

    2011-06-01

    Full Text Available Suplemento del número 12 de marcoELE (enero - junio de 2011 La unidad didáctica Gonzalo Rojas: la infancia del poeta en Lebu fue mi trabajo final del seminario “Enfoque por Tareas: programaciones y metodología”, dictado por Sheila Estaire, en el Programa de Máster en Enseñanza del Español como Lengua Extranjera (MEELE 2004-2005, de la Universidad Antonio de Nebrija, en Madrid. Posteriormente, a partir de ese trabajo, y bajo la dirección de Estaire, realicé mi Memoria de Máster: “Los principios del enfoque por tareas y su aplicación en la programación de la Unidad Didáctica Gonzalo Rojas: la infancia del poeta en Lebu “. Este libro corresponde a esa Memoria. En la primera parte, se revisan los aspectos teóricos; después de dar una mirada al Enfoque Comunicativo que da origen al Enfoque por Tareas, se presentan los fundamentos de éste último. En la segunda parte, se describen las Tareas que componen esta Unidad Didáctica. En la tercera parte, damos cuenta de la implementación de la Unidad Didáctica, el año 2005, en un curso del Programa de Lengua y Cultura de la Universidad de California en Concepción, al que asistieron veintidós estudiantes de diversas carreras de esa universidad. Finalmente, en los anexos, entregamos los resultados del trabajo de los estudiantes y el material necesario para implementar la unidad. La unidad didáctica Gonzalo Rojas: la infancia del poeta en Lebu, comienza con la presentación de mi documental Gonzalo Rojas: la casa, el fuego, el río; y con el análisis del poema Carbón, en el que el poeta habla de su infancia en Lebu y de su padre minero. Las primeras dieciocho tareas están destinadas a conocer al poeta, su pueblo natal, y a profundizar en el texto del poema. Posteriormente, hay tres tareas que buscan establecer una relación entre los poemas Carbón y El padre, de Pablo Neruda; y entre los primeros años de vida de ambos poetas. La tarea final de la unidad didáctica consiste en

  10. Defining Ecosystem Assets for Natural Capital Accounting.

    Science.gov (United States)

    Hein, Lars; Bagstad, Ken; Edens, Bram; Obst, Carl; de Jong, Rixt; Lesschen, Jan Peter

    2016-01-01

    In natural capital accounting, ecosystems are assets that provide ecosystem services to people. Assets can be measured using both physical and monetary units. In the international System of Environmental-Economic Accounting, ecosystem assets are generally valued on the basis of the net present value of the expected flow of ecosystem services. In this paper we argue that several additional conceptualisations of ecosystem assets are needed to understand ecosystems as assets, in support of ecosystem assessments, ecosystem accounting and ecosystem management. In particular, we define ecosystems' capacity and capability to supply ecosystem services, as well as the potential supply of ecosystem services. Capacity relates to sustainable use levels of multiple ecosystem services, capability involves prioritising the use of one ecosystem service over a basket of services, and potential supply considers the ability of ecosystems to generate services regardless of demand for these services. We ground our definitions in the ecosystem services and accounting literature, and illustrate and compare the concepts of flow, capacity, capability, and potential supply with a range of conceptual and real-world examples drawn from case studies in Europe and North America. Our paper contributes to the development of measurement frameworks for natural capital to support environmental accounting and other assessment frameworks.

  11. Developing spatial biophysical accounting for multiple ecosystem services

    NARCIS (Netherlands)

    Remme, R.P.; Schroter, M.; Hein, L.G.

    2014-01-01

    Ecosystem accounting is receiving increasing interest as a way to systematically monitor the conditions of ecosystems and the ecosystem services they provide. A critical element of ecosystem accounting is understanding spatially explicit flows of ecosystem services. We developed spatial biophysical

  12. Ensemble ecosystem modeling for predicting ecosystem response to predator reintroduction.

    Science.gov (United States)

    Baker, Christopher M; Gordon, Ascelin; Bode, Michael

    2017-04-01

    Introducing a new or extirpated species to an ecosystem is risky, and managers need quantitative methods that can predict the consequences for the recipient ecosystem. Proponents of keystone predator reintroductions commonly argue that the presence of the predator will restore ecosystem function, but this has not always been the case, and mathematical modeling has an important role to play in predicting how reintroductions will likely play out. We devised an ensemble modeling method that integrates species interaction networks and dynamic community simulations and used it to describe the range of plausible consequences of 2 keystone-predator reintroductions: wolves (Canis lupus) to Yellowstone National Park and dingoes (Canis dingo) to a national park in Australia. Although previous methods for predicting ecosystem responses to such interventions focused on predicting changes around a given equilibrium, we used Lotka-Volterra equations to predict changing abundances through time. We applied our method to interaction networks for wolves in Yellowstone National Park and for dingoes in Australia. Our model replicated the observed dynamics in Yellowstone National Park and produced a larger range of potential outcomes for the dingo network. However, we also found that changes in small vertebrates or invertebrates gave a good indication about the potential future state of the system. Our method allowed us to predict when the systems were far from equilibrium. Our results showed that the method can also be used to predict which species may increase or decrease following a reintroduction and can identify species that are important to monitor (i.e., species whose changes in abundance give extra insight into broad changes in the system). Ensemble ecosystem modeling can also be applied to assess the ecosystem-wide implications of other types of interventions including assisted migration, biocontrol, and invasive species eradication. © 2016 Society for Conservation Biology.

  13. Progress and challenges in the development of ecosystem accounting as a tool to analyse ecosystem capital

    NARCIS (Netherlands)

    Hein, Lars; Obst, Carl; Edens, Bram; Remme, R.P.

    2015-01-01

    Ecosystem accounting has been developed as a systematic approach to incorporate measures of ecosystem services and ecosystem assets into an accounting structure. Ecosystem accounting involves spatially explicit modelling of ecosystem services and assets, in both physical and monetary terms. A

  14. Marco actual del suicidio e ideas suicidas en personal sanitario

    Directory of Open Access Journals (Sweden)

    M. Cano-Langreo

    2014-03-01

    Full Text Available Introducción: El suicidio es un problema de salud pública en muchos países. Varios estudios han demostrado factores de riesgo laborales asociados a ideación suicida y altos índices de suicidio en el personal sanitario con respecto a la población general. Objetivos: Describir la situación actual del suicidio en el personal sanitario y evaluar las características demográficas, factores laborales relacionados con ideación suicida y tendencias de acuerdo a la localización geográfica y además compararlas con la población general u otras profesiones. Método: Revisión bibliográfica en diferentes bases de datos, en dos fases: búsqueda/selección de artículos y evaluación de 20 estudios seleccionados. Resultados: El personal sanitario tiene mayor riesgo de suicidio comparado con la población general y otras profesiones. Se evidenció mayor riesgo en los sectores de enfermería, farmacéutico, odontología y medicina. Las especialidades médicas con mayor riesgo son anestesiología y psiquiatría. La tasa de suicidio es mayor en mujeres. Se objetiva mayor riesgo en grupos de mayor edad. En cuanto los métodos más utilizados en EEUU son las armas de fuego, mientras que en otros países es la sobredosis de drogas. Las experiencias desagradables recientes/acoso laboral, el burnout y conflictos laborales han demostrado ser factores de riesgo en la ideación suicida en médicos. Conclusiones: Existen diferencias demográficas en las características del suicidio de acuerdo a diferentes poblaciones estudiadas. Los métodos empleados en médicos por países son diferentes, que posiblemente se deban a la influencia cultural de cada país. Se han encontrado factores asociados entre riesgo e ideación suicida. Sería importante trabajar en ellos para elaborar estrategias de prevención en esta población.

  15. Parallel ecological networks in ecosystems

    Science.gov (United States)

    Olff, Han; Alonso, David; Berg, Matty P.; Eriksson, B. Klemens; Loreau, Michel; Piersma, Theunis; Rooney, Neil

    2009-01-01

    In ecosystems, species interact with other species directly and through abiotic factors in multiple ways, often forming complex networks of various types of ecological interaction. Out of this suite of interactions, predator–prey interactions have received most attention. The resulting food webs, however, will always operate simultaneously with networks based on other types of ecological interaction, such as through the activities of ecosystem engineers or mutualistic interactions. Little is known about how to classify, organize and quantify these other ecological networks and their mutual interplay. The aim of this paper is to provide new and testable ideas on how to understand and model ecosystems in which many different types of ecological interaction operate simultaneously. We approach this problem by first identifying six main types of interaction that operate within ecosystems, of which food web interactions are one. Then, we propose that food webs are structured among two main axes of organization: a vertical (classic) axis representing trophic position and a new horizontal ‘ecological stoichiometry’ axis representing decreasing palatability of plant parts and detritus for herbivores and detrivores and slower turnover times. The usefulness of these new ideas is then explored with three very different ecosystems as test cases: temperate intertidal mudflats; temperate short grass prairie; and tropical savannah. PMID:19451126

  16. Ecosystem services provided by waterbirds.

    Science.gov (United States)

    Green, Andy J; Elmberg, Johan

    2014-02-01

    Ecosystem services are ecosystem processes that directly or indirectly benefit human well-being. There has been much recent literature identifying different services and the communities and species that provide them. This is a vital first step towards management and maintenance of these services. In this review, we specifically address the waterbirds, which play key functional roles in many aquatic ecosystems, including as predators, herbivores and vectors of seeds, invertebrates and nutrients, although these roles have often been overlooked. Waterbirds can maintain the diversity of other organisms, control pests, be effective bioindicators of ecological conditions, and act as sentinels of potential disease outbreaks. They also provide important provisioning (meat, feathers, eggs, etc.) and cultural services to both indigenous and westernized societies. We identify key gaps in the understanding of ecosystem services provided by waterbirds and areas for future research required to clarify their functional role in ecosystems and the services they provide. We consider how the economic value of these services could be calculated, giving some examples. Such valuation will provide powerful arguments for waterbird conservation. © 2013 The Authors. Biological Reviews © 2013 Cambridge Philosophical Society.

  17. Belowground dynamics in mangrove ecosystems

    Science.gov (United States)

    McKee, Karen L.

    2004-01-01

    Mangrove ecosystems are tropical/subtropical communities of primarily tree species that grow in the intertidal zone. These tidal communities are important coastal ecosystems that are valued for a variety of ecological and societal goods and services (fig. 1). Mangrove wetlands are important filters of materials moving between the land and sea, trapping sediment, nutrients, and pollutants in runoff from uplands and preventing their direct introduction into sensitive marine ecosystems such as seagrass beds and coral reefs. Mangroves serve as nursery grounds and refuge for a variety of organisms and are consequently vital to the biological productivity of coastal waters. Furthermore, because mangroves are highly resilient to disturbances such as hurricanes, they represent a self-sustaining, protective barrier for human populations living in the coastal zone. Mangrove ecosystems also contribute to shoreline stabilization through consolidation of unstable mineral sediments and peat formation. In order to help conserve mangrove ecoystems, scientists with the United States Geological Survey (USGS) at the National Wetlands Research Center are working to more fully understand the dynamics that impact these vital ecosystems.

  18. Influence of the prunnig of trees on the volume and distribution of the rain on the floor in dehesa ecosystem; Influencia de la poda del arbolado en el volumen y distribucion de la lluvia sobre el suelo en el ecosistema dehesa

    Energy Technology Data Exchange (ETDEWEB)

    Mateos Rodriguez, A. B.; Schnabel, S.

    2009-07-01

    Dehesas are dominant ecosystems in the region of Extremadure (SW Spain), being Quercus species, mainly holm and cork oaks the dominant tree species. Those species undertake a very important role on the dehesa landscapes as essential elements for the adequate functioning of the systems. Among other issues, tree cover affects the spatial distribution of rainfall. (Author) 4 refs.

  19. Defining Ecosystem Assets for Natural Capital Accounting

    Science.gov (United States)

    Hein, Lars; Bagstad, Ken; Edens, Bram; Obst, Carl; de Jong, Rixt; Lesschen, Jan Peter

    2016-01-01

    In natural capital accounting, ecosystems are assets that provide ecosystem services to people. Assets can be measured using both physical and monetary units. In the international System of Environmental-Economic Accounting, ecosystem assets are generally valued on the basis of the net present value of the expected flow of ecosystem services. In this paper we argue that several additional conceptualisations of ecosystem assets are needed to understand ecosystems as assets, in support of ecosystem assessments, ecosystem accounting and ecosystem management. In particular, we define ecosystems’ capacity and capability to supply ecosystem services, as well as the potential supply of ecosystem services. Capacity relates to sustainable use levels of multiple ecosystem services, capability involves prioritising the use of one ecosystem service over a basket of services, and potential supply considers the ability of ecosystems to generate services regardless of demand for these services. We ground our definitions in the ecosystem services and accounting literature, and illustrate and compare the concepts of flow, capacity, capability, and potential supply with a range of conceptual and real-world examples drawn from case studies in Europe and North America. Our paper contributes to the development of measurement frameworks for natural capital to support environmental accounting and other assessment frameworks. PMID:27828969

  20. Defining ecosystem assets for natural capital accounting

    Science.gov (United States)

    Hein, Lars; Bagstad, Kenneth J.; Edens, Bram; Obst, Carl; de Jong, Rixt; Lesschen, Jan Peter

    2016-01-01

    In natural capital accounting, ecosystems are assets that provide ecosystem services to people. Assets can be measured using both physical and monetary units. In the international System of Environmental-Economic Accounting, ecosystem assets are generally valued on the basis of the net present value of the expected flow of ecosystem services. In this paper we argue that several additional conceptualisations of ecosystem assets are needed to understand ecosystems as assets, in support of ecosystem assessments, ecosystem accounting and ecosystem management. In particular, we define ecosystems’ capacity and capability to supply ecosystem services, as well as the potential supply of ecosystem services. Capacity relates to sustainable use levels of multiple ecosystem services, capability involves prioritising the use of one ecosystem service over a basket of services, and potential supply considers the ability of ecosystems to generate services regardless of demand for these services. We ground our definitions in the ecosystem services and accounting literature, and illustrate and compare the concepts of flow, capacity, capability, and potential supply with a range of conceptual and real-world examples drawn from case studies in Europe and North America. Our paper contributes to the development of measurement frameworks for natural capital to support environmental accounting and other assessment frameworks.

  1. La pintura como metáfora y máscara: la concepción del arte en María Zambrano

    Directory of Open Access Journals (Sweden)

    Heura Posada

    2012-03-01

    Full Text Available En este artículo se aborda el pensamiento de María Zambrano como una losofía inspiradora para la ciudadanía de hoy. Dentro de los múltiples temas tratados por la autora, la pintura gura entre ellos como “un lugar privilegiado donde detener la mirada”. La mirada, un aspecto primordial para la autora, se entrena y nos revela aspectos de la vida que no podemos retener sin detener el tiempo en la contemplación de ciertas imágenes, como para ella será la imagen de Santa Bárbara del Maestro de Flémalle en el mueso del Prado. Años más tarde, después de su largo exilio, María Zambrano escribe sobre lo que ha representado para ella mirar a Bárbara “en su Ser, estando en ella misma”. La pintura, nos dice Zambrano, es agua y “nace de las cavernas, en la noche perenne, al resplandor desigual del fuego, adherida a la roca desnuda”. Pensar y contemplar la pintura es hacerlo acerca del origen de lo humano, del trabajo y de su condición de posibilidad, así como de su porvenir. El tiempo para contemplar la pintura nos devuelve un tiempo humanizado donde es posible el pensamiento y la proyección, con sentido, de la vida humana. Desde el pensamiento de la autora podemos hacer conexiones hacia otros pensadores, a menudo más conocidos y difundidos que ella, a través de algunos conceptos como el tiempo, la persona, la razón (poética, la democracia o el arte.

  2. Bundling ecosystem services in Denmark

    DEFF Research Database (Denmark)

    Turner, Katrine Grace; Odgaard, Mette Vestergaard; Bøcher, Peder Klith

    2014-01-01

    We made a spatial analysis of 11 ecosystem services at a 10 km × 10 km grid scale covering most of Denmark. Our objective was to describe their spatial distribution and interactions and also to analyze whether they formed specific bundle types on a regional scale in the Danish cultural landscape....... We found clustered distribution patterns of ecosystem services across the country. There was a significant tendency for trade-offs between on the one hand cultural and regulating services and on the other provisioning services, and we also found the potential of regulating and cultural services...... to form synergies. We identified six distinct ecosystem service bundle types, indicating multiple interactions at a landscape level. The bundle types showed specialized areas of agricultural production, high provision of cultural services at the coasts, multifunctional mixed-use bundle types around urban...

  3. Valuation of rangeland ecosystem services

    Science.gov (United States)

    Gascoigne, W.R.

    2011-01-01

    Economic valuation lends itself well to the anthropocentric orientation of ecosystem services. An economic perspective on ecosystems portrays them as natural assets providing a flow of goods and services valuable to individuals and society collectively. A few examples include the purification of drinking water, reduced risk from flooding and other extreme events, pollination of agricultural crops, climate regulation, and recreation opportunities from plant and animal habitat maintenance, among many others. Once these goods and services are identified and quantified, they can be monetized to complete the valuation process. The monetization of ecosystem goods and services (in the form of dollars) provides a common metric that allows for cross-comparison of attributes and evaluation of differing ecological scenarios. Complicating the monetization process is the fact that most of these goods and services are public and non-market in nature; meaning they are non-rival and non-exclusive and are typically not sold in a traditional market setting where monetary values are revealed. Instead, one must employ non-market valuation techniques, with primary valuation methods typically being very time and resource consuming, intimidating to non-economists, and often impractical. For these reasons, benefit transfer methods have gained popularity. This methodology harnesses the primary collection results of existing studies to make inferences about the economic values of non-market goods and services at an alternative policy site (in place and/or in time). For instance, if a primary valuation study on oak reestablishment on rangelands in southern California yielded a value of $30 per-acre associated with water regulation, this result can be transferred, with some adjustments, to say something about the value of an acre of oaks on rangelands in northern portions of the state. The economic valuation of rangeland ecosystem services has many roles. Economic values may be used as input

  4. Biología poblacional de huirales submareales de Macrocystis integrifolia y Lessonia trabeculata (Laminariales, Phaeophyceae en un ecosistema de surgencia del norte de Chile: variabilidad interanual y El Niño 1997-1998 Population biology of the subtidal kelps Macrocystis integrifolia and Lessonia trabeculata (Laminariales, Phaeophyceae in an upwelling ecosystem of northern Chile: interannual variability and El Niño 1997-1998

    Directory of Open Access Journals (Sweden)

    J.M. ALONSO VEGA

    2005-03-01

    Full Text Available This paper describes the population biology of Lessonia trabeculata and Macrocystis integrifolia during and after the 1997-1998 El Niño in an area of permanent coastal upwelling in northern Chile. Spatial and temporal patterns of distribution were evaluated seasonally for adult and juvenile sporophytes of both species between 1996 and 2003. These two kelp form an assemblage distributed between 2 and 15 m depth, with disjunct patterns along a bathymetric gradient, including two morphs of L. trabeculata, the occurrence of which depends on the presence or absence of M. integrifolia. During the 1997-1998 El Niño the spatial-temporal patterns of abundance of the kelp assemblage were maintained by the continuity of coastal upwelling, which buffered and moderated superficial warming of the sea and depletion of nutrients. In this context, localities associated with coastal upwelling areas could function as "sources" of reproductive propagules after passage of El Niño, thus increasing kelp recolonization rates in "sink" localities, which suffered local kelp extinctions. Intensification of upwelling processes after the 1998-2000 La Niña increased nutrient inputs into subtidal habitats, favoring the productivity of the kelp assemblage. However, an abrupt change in the spatial-temporal patterns of abundance of the black sea urchin Tetrapygus niger, the most conspicuous benthic grazer in northern Chile, produced local extinctions of M. integrifolia and compression of the range of bathymetric distribution of L. trabeculata. Top-down (mortality of benthic carnivores during the 1997-1998 El Niño and bottom-up effects (intensity and frequency of upwelling in this subtidal coastal ecosystem appear to regulate the kelp-herbivore interactions in the study area. The main sources of reproductive propagules for the re-establishment of the assemblage kelp were fertile sporophytes which included isolated, low density patches of M.integrifolia located within the bed

  5. Controls on winter ecosystem respiration in temperate and boreal ecosystems

    Science.gov (United States)

    T. Wang; P. Ciais; S.L. Piao; C. Ottle; P. Brender; F. Maignan; A. Arain; A. Cescatti; D. Gianelle; C. Gough; L Gu; P. Lafleur; T. Laurila; B. Marcolla; H. Margolis; L. Montagnani; E. Moors; N. Saigusa; T. Vesala; G. Wohlfahrt; C. Koven; A. Black; E. Dellwik; A. Don; D. Hollinger; A. Knohl; R. Monson; J. Munger; A. Suyker; A. Varlagin; S. Verma

    2011-01-01

    Winter CO2 fluxes represent an important component of the annual carbon budget in northern ecosystems. Understanding winter respiration processes and their responses to climate change is also central to our ability to assess terrestrial carbon cycle and climate feedbacks in the future. However, the factors influencing the spatial and temporal...

  6. Mapping monetary values of ecosystem services in support of developing ecosystem accounts

    NARCIS (Netherlands)

    Sumarga, Elham; Hein, Lars; Edens, Bram; Suwarno, Aritta

    2015-01-01

    Ecosystem accounting has been proposed as a comprehensive, innovative approach to natural capital accounting, and basically involves the biophysical and monetary analysis of ecosystem services in a national accounting framework. Characteristic for ecosystem accounting is the spatial approach

  7. Scenarios for Ecosystem Services: An Overview

    Directory of Open Access Journals (Sweden)

    Stephen R. Carpenter

    2006-06-01

    Full Text Available The Millennium Ecosystem Assessment (MA scenarios address changes in ecosystem services and their implications for human well-being. Ecological changes pose special challenges for long-term thinking, because of the possibility of regime shifts that occur rapidly yet alter the availability of ecosystem services for generations. Moreover, ecological feedbacks can intensify human modification of ecosystems, creating a spiral of poverty and ecosystem degradation. Such complex dynamics were evaluated by a mixture of qualitative and quantitative analyses in the MA scenarios. Collectively, the scenarios explore problems such as the connections of poverty reduction and ecosystem services, and trade-offs among ecosystem services. Several promising approaches are considered by the scenarios, including uses of biodiversity to build resilience of ecosystem services, actively adaptive management, and green technology. Although the scenarios do not prescribe an optimal path, they illuminate the consequences of different policies toward ecosystem services.

  8. Software ecosystems – a systematic literature review

    DEFF Research Database (Denmark)

    Manikas, Konstantinos; Hansen, Klaus Marius

    2013-01-01

    A software ecosystem is the interaction of a set of actors on top of a common technological platform that results in a number of software solutions or services. Arguably, software ecosystems are gaining importance with the advent of, e.g., the Google Android, Apache, and Salesforce.com ecosystems....... However, there exists no systematic overview of the research done on software ecosystems from a software engineering perspective. We performed a systematic literature review of software ecosystem research, analyzing 90 papers on the subject taken from a gross collection of 420. Our main conclusions...... are that while research on software ecosystems is increasing (a) there is little consensus on what constitutes a software ecosystem, (b) few analytical models of software ecosystems exist, and (c) little research is done in the context of real-world ecosystems. This work provides an overview of the field, while...

  9. Quantifying the web browser ecosystem.

    Science.gov (United States)

    Ferdman, Sela; Minkov, Einat; Bekkerman, Ron; Gefen, David

    2017-01-01

    Contrary to the assumption that web browsers are designed to support the user, an examination of a 900,000 distinct PCs shows that web browsers comprise a complex ecosystem with millions of addons collaborating and competing with each other. It is possible for addons to "sneak in" through third party installations or to get "kicked out" by their competitors without user involvement. This study examines that ecosystem quantitatively by constructing a large-scale graph with nodes corresponding to users, addons, and words (terms) that describe addon functionality. Analyzing addon interactions at user level using the Personalized PageRank (PPR) random walk measure shows that the graph demonstrates ecological resilience. Adapting the PPR model to analyzing the browser ecosystem at the level of addon manufacturer, the study shows that some addon companies are in symbiosis and others clash with each other as shown by analyzing the behavior of 18 prominent addon manufacturers. Results may herald insight on how other evolving internet ecosystems may behave, and suggest a methodology for measuring this behavior. Specifically, applying such a methodology could transform the addon market.

  10. Mangrove ecosystems under climate change

    Science.gov (United States)

    Jennerjahn, T.C.; Gilman, E.; Krauss, Ken W.; Lacerda, L.D.; Nordhaus, I.; Wolanski, E.

    2017-01-01

    This chapter assesses the response of mangrove ecosystems to possible outcomes of climate change, with regard to the following categories: (i) distribution, diversity, and community composition, (ii) physiology of flora and fauna, (iii) water budget, (iv) productivity and remineralization, (v) carbon storage in biomass and sediments, and (vi) the filter function for elements beneficial or harmful to life. These categories are then used to identify the regions most vulnerable to climate change. The four most important factors determining the response of mangrove ecosystems to climate change are sea level rise, an increase in frequency and/or intensity of storms, increases in temperature, and aridity. While these changes may be beneficial for some mangrove forests at latitudinal distribution limits, they will threaten forest structure and functions and related ecosystem services in most cases. The interaction of climate change with human interventions is discussed, as well as the effects on ecosystem services including possible adaptation and management options. The chapter closes with an outlook on knowledge gaps and priority research needed to fill these gaps.

  11. Ecosystem Restoration: Fact or Fancy?

    Science.gov (United States)

    John A. Stanturf; Callie J. Schweitzer; Stephen H. Schoenholtz; James P. Barnett; Charles K. McMahon; Donald J. Tomszak

    1998-01-01

    Ecological restoration is generally accepted as the reestablishment of natural ecological processes that produce certain dynamic ecosystem properties of structure, function, and processes. But restore to what? The most frequently used conceptual model for the restoration process is the shift of conditions from some current (degraded) dynamic state to some past dynamic...

  12. Conditions for entrepreneurial ecosystem development

    DEFF Research Database (Denmark)

    Radziwon, Agnieszka; Bogers, Marcel; Brem, Alexander

    ecosystems. The key findings discussed in the paper include general organizational requirements and governing structures, the role of leadership and ownership of the initiatives, and suggestions for potential collaborative areas. The paper concludes with suggestions both for potential inter......-firm collaborative areas and for policy makers’ support....

  13. Forest operations for ecosystem management

    Science.gov (United States)

    Robert B. Rummer; John Baumgras; Joe McNeel

    1997-01-01

    The evolution of modern forest resource management is focusing on ecologically sensitive forest operations. This shift in management strategies is producing a new set of functional requirements for forest operations. Systems to implement ecosystem management prescriptions may need to be economically viable over a wider range of piece sizes, for example. Increasing...

  14. Parallel ecological networks in ecosystems

    NARCIS (Netherlands)

    Olff, Han; Alonso, David; Berg, Matty P.; Eriksson, B. Klemens; Loreau, Michel; Piersma, Theunis; Rooney, Neil

    2009-01-01

    In ecosystems, species interact with other species directly and through abiotic factors in multiple ways, often forming complex networks of various types of ecological interaction. Out of this suite of interactions, predator-prey interactions have received most attention. The resulting food webs,

  15. Biological invasions in forest ecosystems

    Science.gov (United States)

    Andrew M. Liebhold; Eckehard G. Brockerhoff; Susan Kalisz; Martin A. Nuñez; David A. Wardle; Michael J. Wingfield

    2017-01-01

    Forests play critical roles in global ecosystem processes and provide numerous services to society. But forests are increasingly affected by a variety of human influences, especially those resulting from biological invasions. Species invading forests include woody and herbaceous plants, many animal species including mammals and invertebrates, as well as a variety of...

  16. Simulating the net ecosystem CO

    NARCIS (Netherlands)

    Vuichard, Nicolas; Ciais, Philippe; Viovy, Nicolas; Li, Longhui; Ceschia, Eric; Wattenbach, Martin; Bernhofer, Christian; Emmel, Carmen; Grünwald, Thomas; Jans, Wilma; Loubet, Benjamin; Wu, Xiuchen

    2016-01-01

    Over the last decade, efforts have been carried on to develop and evaluate versions of global terrestrial ecosystem models (GTEM) in which crop specificities are represented. The goal of this study is to evaluate the ability of the ORCHIDEE-STICS (Organising Carbon and Hydrology In Dynamic

  17. 1 Ecosystem-based.cdr

    African Journals Online (AJOL)

    Administrator

    Abstract. The ecosystem approach is a widely accepted framework for natural resource ... Here, we present a set of indicators, and a toolkit to aid their application, that are intended to support the ... Ability to adapt to different spatial scales ... growth of plants and algae, which may increase to create .... taxonomic resources).

  18. Microtopography recreation benefits ecosystem restoration

    Science.gov (United States)

    Wei Wei; Liding Chen; Lei Yang; F. Fred Samadani; Ge Sun

    2012-01-01

    Within the context of global warming and accelerated human activities, the surrounding environments of many terrestrial ecosystems worldwide have become increasingly deteriorated, such that finding suitable methods and effective environmental technology to confront climate change and prevent land degradation is critical to the health and sustainability of the earth. In...

  19. Stability measures in arid ecosystems

    Science.gov (United States)

    Nosshi, M. I.; Brunsell, N. A.; Koerner, S.

    2015-12-01

    Stability, the capacity of ecosystems to persist in the face of change, has proven its relevance as a fundamental component of ecological theory. Here, we would like to explore meaningful and quantifiable metrics to define stability, with a focus on highly variable arid and semi-arid savanna ecosystems. Recognizing the importance of a characteristic timescale to any definition of stability, our metrics will be focused scales from annual to multi-annual, capturing different aspects of stability. Our three measures of stability, in increasing order of temporal scale, are: (1) Ecosystem resistance, quantified as the degree to which the system maintains its mean state in response to a perturbation (drought), based on inter-annual variability in Normalized Difference Vegetation Index (NDVI). (2) An optimization approach, relevant to arid systems with pulse dynamics, that models vegetation structure and function based on a trade off between the ability to respond to resource availability and avoid stress. (3) Community resilience, measured as species turnover rate (β diversity). Understanding the nature of stability in structurally-diverse arid ecosystems, which are highly variable, yields theoretical insight which has practical implications.

  20. Quantifying the web browser ecosystem

    Science.gov (United States)

    Ferdman, Sela; Minkov, Einat; Gefen, David

    2017-01-01

    Contrary to the assumption that web browsers are designed to support the user, an examination of a 900,000 distinct PCs shows that web browsers comprise a complex ecosystem with millions of addons collaborating and competing with each other. It is possible for addons to “sneak in” through third party installations or to get “kicked out” by their competitors without user involvement. This study examines that ecosystem quantitatively by constructing a large-scale graph with nodes corresponding to users, addons, and words (terms) that describe addon functionality. Analyzing addon interactions at user level using the Personalized PageRank (PPR) random walk measure shows that the graph demonstrates ecological resilience. Adapting the PPR model to analyzing the browser ecosystem at the level of addon manufacturer, the study shows that some addon companies are in symbiosis and others clash with each other as shown by analyzing the behavior of 18 prominent addon manufacturers. Results may herald insight on how other evolving internet ecosystems may behave, and suggest a methodology for measuring this behavior. Specifically, applying such a methodology could transform the addon market. PMID:28644833

  1. Future directions of ecosystem science

    Science.gov (United States)

    Baron, Jill S.; Galvin, Kathleen A.

    1990-01-01

    Scientific knowledge about ecosystem structure and function has expanded greatly during the past few decades. Terrestrial and aquatic nutrient cycling, ecosystem energetics, population dynamics, belowground processes, and food webs have been studied at the plot, stand, watershed, and landscape levels at many locations around the globe. Ideas about terrestrial-atmospheric interactions and human interference in these processes have changed dramatically. There is new appreciation of the need to incorporate into ecosystem studies the interactions between human populations and the ecosystem, not only because humans affect ecosystem processes, but because these systems support human populations (Glantz 1988, Holden 1988, Parry et al. 1988, WCED 1987). Recent advances in ecosystem science are due, in part, to technological improvements in computing power, new laboratory and field physical and chemical analytical techniques, and satellite imagery for remote sensing of Earth's structure and dynamics. Modeling and geographic information systems have provided the capability for integrating multiple data sets with process simulations to generate hypotheses about regional ecosystem function. Concurrent with these scientific developments has been a growing concern about the links between the health of the environment and world-wide industrial, land, and resource-management practices. Environmental damage at the local level was widely recognized in the 1960s, prompting the environmental movement of that decade. Regional environmental problems with multiple effects and politically difficult solutions have been perceived more recently; the issue of acidic deposition provides an example of such a second-generation concern (Clark and Holling 1985). Today there is a growing awareness of global-scale environmental degradation brought about by the combined actions of all peoples on Earth (Clark 1989, Woodmansee et al. 1988). The three levels of environmental concern--local, regional

  2. [Research progress of ecosystem service flow.

    Science.gov (United States)

    Liu, Hui Min; Fan, Yu Long; Ding, Sheng Yan

    2016-07-01

    With the development of social economy, human disturbance has resulted in a variety of ecosystem service degradation or disappearance. Ecosystem services flow plays an important role in delivery, transformation and maintenance of ecosystem services, and becomes one of the new research directions. In this paper, based on the classification of ecosystem services flow, we analyzed ecosystem service delivery carrier, and investigated the mechanism of ecosystem service flow, including the information, property, scale features, quantification and cartography. Moreover, a tentative analysis on cost-effective of ecosystem services flow (such as transportation costs, conversion costs, usage costs and cost of relativity) was made to analyze the consumption cost in ecosystem services flow process. It aimed to analyze dissipation cost in ecosystem services flow process. To a certain extent, the study of ecosystem service flow solved the problem of "double counting" in ecosystem services valuation, which could make a contribution for the sake of recognizing hot supply and consumption spots of ecosystem services. In addition, it would be conducive to maximizing the ecosystem service benefits in the transmission process and putting forward scientific and reasonable ecological compensation.

  3. Acerca del moho

    Science.gov (United States)

    El moho forma parte del medio ambiente natural. Afuera del hogar, el moho juega un papel en la naturaleza al desintegrar materias organicas tales como las hojas que se han caido o los arboles muertos. El moho puede crecer adentro del hogar cuando las espor

  4. Del bit al qubit

    OpenAIRE

    Torras Font, Josep

    2011-01-01

    Aquest document pretén donar una visió del desenvolupament dels computadors electrònics i dels components que els han fet possibles. Dintre de les opcions de futur en computació, també intenta donar una visió de les bases en que es fonamenta la computació quàntica.

  5. Our natural capital: Ecosystem service delivery

    CSIR Research Space (South Africa)

    Dziba, L

    2012-10-01

    Full Text Available new technologies in Earth observation that target relevant ecosystem attributes for monitoring ecosystem service changes, tools for spatial development planning in multifunctional landscapes such as ecological infrastructure mapping for disaster...

  6. Grazing management that regenerates ecosystem function and ...

    African Journals Online (AJOL)

    Grazing management that regenerates ecosystem function and grazingland ... in ecosystem improvement, productivity, soil carbon and fertility, water-holding ... for sufficient time to produce resource improvement, sound animal production, and ...

  7. Identifying national freshwater ecosystem priority areas

    CSIR Research Space (South Africa)

    Nel, JL

    2012-10-01

    Full Text Available This presentation highlights the use of systematic conservation planning to identify priority areas for managing the health of freshwater ecosystems and their associated biodiversity and ecosystem services....

  8. Analyzing, Modelling, and Designing Software Ecosystems

    DEFF Research Database (Denmark)

    Manikas, Konstantinos

    as the software development and distribution by a set of actors dependent on each other and the ecosystem. We commence on the hypothesis that the establishment of a software ecosystem on the telemedicine services of Denmark would address these issues and investigate how a software ecosystem can foster...... the development, implementation, and use of telemedicine services. We initially expand the theory of software ecosystems by contributing to the definition and understanding of software ecosystems, providing means of analyzing existing and designing new ecosystems, and defining and measuring the qualities...... of software ecosystems. We use these contributions to design a software ecosystem in the telemedicine services of Denmark with (i) a common platform that supports and promotes development from different actors, (ii) high software interaction, (iii) strong social network of actors, (iv) robust business...

  9. Adventures in holistic ecosystem modelling: the cumberland basin ecosystem model

    Science.gov (United States)

    Gordon, D. C.; Keizer, P. D.; Daborn, G. R.; Schwinghamer, P.; Silvert, W. L.

    A holistic ecosystem model has been developed for the Cumberland Basin, a turbid macrotidal estuary at the head of Canada's Bay of Fundy. The model was constructed as a group exercise involving several dozen scientists. Philosophy of approach and methods were patterned after the BOEDE Ems-Dollard modelling project. The model is one-dimensional, has 3 compartments and 3 boundaries, and is composed of 3 separate submodels (physical, pelagic and benthic). The 28 biological state variables cover the complete estuarine ecosystem and represent broad functional groups of organisms based on trophic relationships. Although still under development and not yet validated, the model has been verified and has reached the stage where most state variables provide reasonable output. The modelling process has stimulated interdisciplinary discussion, identified important data gaps and produced a quantitative tool which can be used to examine ecological hypotheses and determine critical environmental processes. As a result, Canadian scientists have a much better understanding of the Cumberland Basin ecosystem and are better able to provide competent advice on environmental management.

  10. Ecological Values of Mangrove Forest Ecosystem

    OpenAIRE

    Kusmana, Cecep

    1996-01-01

    Research on quantification of ecological values of mangrove forest ecosystem are urgently needed, due to its importance as the basics for utilization and management of resources. From the ecological point of vlew, the main prohlem of mangrove ecosystem is rarity and inconsistency of data and limited accurate methods inquantifying ecological values of that ecosystem. Results show that mangrove has the significant ecological values on coastal ecosystem. However, there must be further research t...

  11. Socio-ecosystems and urban habitats

    Science.gov (United States)

    Margarita V. Alario

    2007-01-01

    The Millennium Ecosystem Assessment (MA)—a United Nations effort to assess the health of major global ecosystems—reported that over the past 50 years, humans have changed ecosystems more rapidly and extensively than in any comparable time in history. Around two thirds of the ecosystems services (anything from fresh water to air) are being degraded or used unsustainably...

  12. Indicators for mapping ecosystem services: a review

    OpenAIRE

    EGOH BENIS NCHINE; DRAKOU EVANGELIA; DUNBAR MARTHA BONNET; MAES JOACHIM; WILLEMEN LOUISE

    2012-01-01

    Ecosystem services are the benefits that humans derive from ecosystems, such as food provisioning, water regulating and provisioning, soil productivity, and use of natural areas for recreation. The current challenge is to mainstream ecosystem services into policies and practices in order to ensure the continuous provision of these benefits to humans. The European Union has adopted an EU Biodiversity Strategy for 2020 in which the target of safeguarding ecosystem services is explicitly include...

  13. A tiered approach for ecosystem services mapping

    OpenAIRE

    Grêt-Regamey, Adrienne; Weibel, Bettina; Rabe, Sven-Erik; Burkhard, Benjamin

    2017-01-01

    Mapping ecosystem services delivers essential insights into the spatial characteristics of various goods’ and services’ flows from nature to human society. It has become a central topic of science, policy, business and society – all belonging on functioning ecosystems. This textbook summarises the current state-of-the-art of ecosystem services mapping, related theory and methods, different ecosystem service quantification and modelling approaches as well as practical applications. The book...

  14. The Multifaceted Aspects of Ecosystem Integrity

    OpenAIRE

    Giulio A. De Leo; Simon A. Levin

    1997-01-01

    The need to reduce human impacts on ecosystems creates pressure for adequate response, but the rush to solutions fosters the oversimplification of such notions as sustainable development and ecosystem health. Hence, it favors the tendency to ignore the complexity of natural systems. In this paper, after a brief analysis of the use and abuse of the notion of ecosystem health, we address the problem of a sound definition of ecosystem integrity, critically review the different methodological and...

  15. Fort Collins Science Center: Ecosystem Dynamics

    Science.gov (United States)

    Bowen, Zack

    2004-01-01

    Many challenging natural resource management issues require consideration of a web of interactions among ecosystem components. The spatial and temporal complexity of these ecosystem problems demands an interdisciplinary approach integrating biotic and abiotic processes. The goals of the Ecosystem Dynamics Branch are to provide sound science to aid federal resource managers and use long-term, place-focused research and monitoring on federal lands to advance ecosystem science.

  16. Towards a network ecology of software ecosystems

    DEFF Research Database (Denmark)

    Hansen, Klaus Marius; Manikas, Konstantinos

    2013-01-01

    of the "network ecology'' approach to the analysis of natural ecosystems. In doing so, we mine the Maven central Java repository and analyze two OSGi ecosystems: Apache Felix and Eclipse Equinox. In particular, we define the concept of an ecosystem ``neighborhood'', apply network ecology metrics...

  17. The biodiversity-dependent ecosystem service debt.

    Science.gov (United States)

    Isbell, Forest; Tilman, David; Polasky, Stephen; Loreau, Michel

    2015-02-01

    Habitat destruction is driving biodiversity loss in remaining ecosystems, and ecosystem functioning and services often directly depend on biodiversity. Thus, biodiversity loss is likely creating an ecosystem service debt: a gradual loss of biodiversity-dependent benefits that people obtain from remaining fragments of natural ecosystems. Here, we develop an approach for quantifying ecosystem service debts, and illustrate its use to estimate how one anthropogenic driver, habitat destruction, could indirectly diminish one ecosystem service, carbon storage, by creating an extinction debt. We estimate that c. 2-21 Pg C could be gradually emitted globally in remaining ecosystem fragments because of plant species loss caused by nearby habitat destruction. The wide range for this estimate reflects substantial uncertainties in how many plant species will be lost, how much species loss will impact ecosystem functioning and whether plant species loss will decrease soil carbon. Our exploratory analysis suggests that biodiversity-dependent ecosystem service debts can be globally substantial, even when locally small, if they occur diffusely across vast areas of remaining ecosystems. There is substantial value in conserving not only the quantity (area), but also the quality (biodiversity) of natural ecosystems for the sustainable provision of ecosystem services. © 2014 John Wiley & Sons Ltd/CNRS.

  18. Indicators for mapping ecosystem services: a review

    NARCIS (Netherlands)

    Egoh, Benis N; Drakou, Evangelia; Dunbar, Martha B.; Maes, Joachim; Willemen, Louise

    2012-01-01

    Ecosystem services are the benefits that humans derive from ecosystems, such as food provisioning, water regulating and provisioning, soil productivity, and use of natural areas for recreation. The current challenge is to mainstream ecosystem services into policies and practices in order to ensure

  19. Process-Based Thinking in Ecosystem Education

    Science.gov (United States)

    Jordan, Rebecca C.; Gray, Steven A.; Brooks, Wesley R.; Honwad, Sameer; Hmelo-Silver, Cindy E.

    2013-01-01

    Understanding complex systems such as ecosystems is difficult for young K-12 students, and students' representations of ecosystems are often limited to nebulously defined relationships between macro-level structural components inherent to the ecosystem in focus (rainforest, desert, pond, etc.) instead of generalizing processes across ecosystems…

  20. Towards a national ecosystem assessment in Germany

    DEFF Research Database (Denmark)

    Albert, Christian; Neßhöver, Carsten; Schröter, Matthias

    2017-01-01

    We present options for a National Ecosystem Assessment in Germany (NEA-DE) that could inform decision-makers on the state and trends of ecosystems and ecosystem services. Characterizing a NEA-DE, we argue that its cross-sectoral, integrative approach would have the advantages of increased...

  1. Biotic elements of NPP techno-ecosystem

    International Nuclear Information System (INIS)

    Protasov, A.A.; Silaeva, A.A.

    2013-01-01

    Specific features of biotic elements in the NPP techno-ecosystems were considered and compared with natural ecosystems. Relationships between biotic communities and environmental factors that are specific to the techno-ecosystems were discussed, and the problems of limitation of biological hindrances in operation of equipment, principles of hydrobiological and environmental monitoring were considered.

  2. Defining ecosystem assets for natural capital accounting

    NARCIS (Netherlands)

    Hein, Lars; Bagstad, Ken; Edens, Bram; Obst, Carl; Jong, de Rixt; Lesschen, Jan Peter

    2016-01-01

    In natural capital accounting, ecosystems are assets that provide ecosystem services to people. Assets can be measured using both physical and monetary units. In the international System of Environmental-Economic Accounting, ecosystem assets are generally valued on the basis of the net present

  3. Weapon in houses in Burgos in the eighteenth century. Between functionality and exhibitionism Armas en las casas burgalesas del siglo XVIII. Entre la funcionalidad y el exhibicionismo

    Directory of Open Access Journals (Sweden)

    Francisco José SANZ DE LA HIGUERA

    2012-12-01

    Full Text Available In domestic interiors in Burgos in the eighteenth century, the post-mortem inventories allow a deep analysis of a rather unknown and disturbing aspect of material culture, the ownership and use of weapons among the urban population of the old Regime. Not all socio-professional and socio-economic categories have access in the same way to firearms or «white» weapons and their availability changes throughout the century. Who owned the weapons? What was their weight on the volume of their fortunes? What accounts for their presence at homes? Personal and domestic protection, professional requirements, exhibitionism in the social hierarchy and ostentation, hunting needs? How much permeability and penetration did weapons know throughout the eighteenth century?En los interiores domésticos del Burgos del siglo XVIII, los inventarios post mortem permiten un análisis intenso de un aspecto bastante desconocido e inquietante de la cultura material, la posesión y usufructo de armas entre la población urbana del Antiguo Régimen. No todas las categorías socioprofesionales y socioeconómicas tenían acceso de la misma manera a las armas de fuego o a las armas «blancas» y su disponibilidad cambia a lo largo de la centuria. ¿Quiénes eran propietarios de armas? ¿Cuál era su peso relativo sobre el volumen de sus fortunas? ¿A qué responde su aparición en las viviendas? ¿Protección personal y doméstica, exigencias profesionales, exhibicionismo en la jerarquía social y boato, necesidad cinegética? ¿Qué grado de permeabilidad y penetración conocieron las armas a lo largo del Setecientos?

  4. Perception, acquisition and use of ecosystem services: human behavior, and ecosystem management and policy implications

    Science.gov (United States)

    Stanley T. Asah; Anne D. Guerry; Dale J. Blahna; Joshua J. Lawler

    2014-01-01

    Ecosystem services, fundamental to livelihoods and well-being, are reshaping environmental management and policy. However, the behavioral dimensions of ecosystem services and the responses of ordinary people to the management of those services, is less well understood. The ecosystem services framework lends itself to understanding the relationship between ecosystems...

  5. Ecosystemic approaches to land degradation

    Energy Technology Data Exchange (ETDEWEB)

    Puigdefabregas, J.; Barrio, G. del; Hill, J.

    2009-07-01

    Land degradation is recognized as the main outcome of desertification. However available procedures for its assessment are still unsatisfactory because are often too costly for surveying large areas and rely on specific components of the degradation process without being able to integrate them in a unique process. One of the objectives of De Survey project is designing and implementing operational procedures for desertification surveillance, including land degradation. A strategic report was compiled and reproduced here for selecting the most appropriate approaches to the project conditions. The report focuses on using attributes of ecosystem maturity as a natural way to integrate the different drivers of land degradation in simple indices. The review surveys different families of attributes concerned with water and energy fluxes through the ecosystem, its capacity to sustain biomass and net primary productivity, and its capacity to structure the space. Finally, some conclusions are presented about the choice criteria of the different approaches in the framne of operational applications. (Author) 20 refs.

  6. Ecosystemic approaches to land degradation

    International Nuclear Information System (INIS)

    Puigdefabregas, J.; Barrio, G. del; Hill, J.

    2009-01-01

    Land degradation is recognized as the main outcome of desertification. However available procedures for its assessment are still unsatisfactory because are often too costly for surveying large areas and rely on specific components of the degradation process without being able to integrate them in a unique process. One of the objectives of De Survey project is designing and implementing operational procedures for desertification surveillance, including land degradation. A strategic report was compiled and reproduced here for selecting the most appropriate approaches to the project conditions. The report focuses on using attributes of ecosystem maturity as a natural way to integrate the different drivers of land degradation in simple indices. The review surveys different families of attributes concerned with water and energy fluxes through the ecosystem, its capacity to sustain biomass and net primary productivity, and its capacity to structure the space. Finally, some conclusions are presented about the choice criteria of the different approaches in the framne of operational applications. (Author) 20 refs.

  7. Interaction webs in arctic ecosystems

    DEFF Research Database (Denmark)

    Schmidt, Niels M.; Hardwick, Bess; Gilg, Olivier

    2017-01-01

    How species interact modulate their dynamics, their response to environmental change, and ultimately the functioning and stability of entire communities. Work conducted at Zackenberg, Northeast Greenland, has changed our view on how networks of arctic biotic interactions are structured, how...... they vary in time, and how they are changing with current environmental change: firstly, the high arctic interaction webs are much more complex than previously envisaged, and with a structure mainly dictated by its arthropod component. Secondly, the dynamics of species within these webs reflect changes...... that the combination of long-term, ecosystem-based monitoring, and targeted research projects offers the most fruitful basis for understanding and predicting the future of arctic ecosystems....

  8. Multivariate Bioclimatic Ecosystem Change Approaches

    Science.gov (United States)

    2015-02-06

    course the sandy soils of the Sandhills will not migrate. This observation suggests that a new nomenclature for ecosystems must be developed if...Coast Sandhills. At that time period, not only will the climate be similar, but the soil character will also be similar. Therefore about the year 2115...Disaggregation of global circulation model outputs decision and policy analysis. Working Paper No. 2. Cali, Colombia : International Centre for Tropical

  9. Trialogue model for ecosystem governance.

    CSIR Research Space (South Africa)

    Hattingh, J

    2007-01-01

    Full Text Available form and timescale to ensure good governance. In essence, good governance promotes democratic management of ecosystems and, by inference, prudentwater resourcemanagement. Consequently, it is likely that the type of governance that occurs most often... that, unless the imperative for civic science to support democratic governance is institutionalised through policy and strategy, it is unlikely that there will be sufficient human and financial investment in civic science as a means to promote...

  10. Blacklist Ecosystem Analysis Update: 2014

    Science.gov (United States)

    2014-12-01

    example, we checked to see if any of the blacklisted IP addresses were known sinkhole IP addresses. This information would essentially invalidate the...indicator as an indicator of malicious activity, since sinkholes are operated by CERTCC-2014-82 4 Blacklist Ecosystem Analysis CERT/CC network defenders who...clean up and collect intelligence on threats. Only one list out of 67, LI_3, contained any sinkhole IP addresses and that list contained only 10. All

  11. Diversity, Adaptability and Ecosystem Resilience

    Science.gov (United States)

    Keribin, Rozenn; Friend, Andrew

    2013-04-01

    Our ability to predict climate change and anticipate its impacts depends on Earth System Models (ESMs) and their ability to account for the high number of interacting components of the Earth System and to gauge both their influence on the climate and the feedbacks they induce. The land carbon cycle is a component of ESMs that is still poorly constrained. Since the 1990s dynamic global vegetation models (DGVMs) have become the main tool through which we understand the interactions between plant ecosystems and the climate. While DGVMs have made it clear the impacts of climate change on vegetation could be dramatic, predicting the dieback of rainforests and massive carbon losses from various ecosystems, they are highly variable both in their composition and their predictions. Their treatment of plant diversity and competition in particular vary widely and are based on highly-simplified relationships that do not account for the multiple levels of diversity and adaptability found in real plant ecosystems. The aim of this GREENCYCLES II project is to extend an individual-based DGVM to treat the diversity of physiologies found in plant communities and evaluate their effect if any on the ecosystem's transient dynamics and resilience. In the context of the InterSectoral Impacts Model Intercomparison Project (ISI-MIP), an initiative coordinated by a team at the Potsdam Institute for Climate Impact Research (PIK) that aims to provide fast-track global impact assessments for the IPCC's Fifth Assessment Report, we compare 6 vegetation models including 4 DGVMs under different climate change scenarios and analyse how the very different treatments of plant diversity and interactions from one model to the next affect the models' results. We then investigate a new, more mechanistic method of incorporating plant diversity into the DGVM "Hybrid" based on ecological tradeoffs mediated by plant traits and individual-based competition for light.

  12. The impact on ocean ecosystems

    International Nuclear Information System (INIS)

    Seymour, A.H.

    1982-01-01

    A nuclear war would have less impact on ocean ecosystems than on terrestrial systems. But damage to coastal regions and estuaries might be substantial. This chapter discusses the distribution, effects, and hazards of fallout radionuclides in the ocean, and attempts to assess the impact on ocean ecosystems of dust particles in the atmosphere, ozone depletion, and temperature change following a nuclear war. The information offers some insight into the impact of such a war, but does not provide definitive predictions. Two other consequences, however, do have the potential for devastating effects upon marine ecosystems. It has been predicted that a 100-fold reduction in solar light intensity at the earth's surface due to particles in the atmosphere is possible; this would result in death to most of the phytoplankton and herbivorous zooplankton in more than half of the oceans of the Northern Hemisphere, and under some circumstances, depletion of ozone in the stratosphere by NOsub(X) could increase UV radiation at the earth's surface, the magnitude of the change being sufficient to seriously reduce the populations of organisms at the base of the food web. Temperature changes would be of little consequence. (U.K.)

  13. Escalas para evaluar la mortalidad de pacientes con trauma y síndrome de insuficiencia respiratoria progresiva del adulto

    Directory of Open Access Journals (Sweden)

    HERNÁNDEZ-GUTIÉRREZ PATRICIA

    1997-01-01

    Full Text Available Objetivo. Comparar las distintas escalas y calificaciones que se usan para evaluar la mortalidad de los pacientes con trauma y síndrome de insuficiencia respiratoria progresiva del adulto. Material y métodos. Se revisaron los expedientes de 80 pacientes, 70 varones y 10 mujeres, atendidos en el Hospital Guillermo Barroso C., de la Cruz Roja Mexicana de la Ciudad de México, que sufrieron trauma y desarrollaron síndrome de insuficiencia respiratoria progresiva del adulto, en el periodo que va del 1 de enero de 1990 al 31 de diciembre de 1993. Se tomaron en cuenta los siguientes parámetros: sexo; edad; mecanismo productor de la lesión; enfermedades asociadas (choque, politransfusiones, fractura de huesos largos, contusión pulmonar y sepsis; criterios diagnósticos del síndrome; fallas sistémicas; falla orgánica múltiple; índice de severidad de las lesiones; sistema de calificación para la evaluación de la salud crónica y la fisiología aguda, versión II; lapso del diagnóstico; duración de la intubación, y tiempo de estancia en la unidad de cuidados intensivos. Resultados. Fallecieron 26 pacientes (32.5%, dos mujeres y 24 varones. Los mecanismos productores de lesión fueron: atropellamiento (31.3%, accidente automovilístico (27.5%, herida por proyectil de arma de fuego (15%, herida por instrumento punzocortante (13.7%, policontusión (7.5% y caídas (5%. En todos los parámetros y escalas se encontró una relación altamente significativa con la mortalidad, excepto en la contusión pulmonar y en la falla gastrointestinal, en las que dicha relación fue dudosa; la duración de la intubación y el tiempo de estancia en la unidad de cuidados intensivos fueron parámetros en los que no se encontró ninguna relación con la mortalidad. Conclusiones. Los pacientes con trauma y que desarrollaron síndrome de insuficiencia respiratoria progresiva del adulto tuvieron una elevada posibilidad de fallecer si, además, presentaron datos cl

  14. Ser excombatiente en los 80: identidad y condiciones en la génesis del CESCEM Corrientes

    Directory of Open Access Journals (Sweden)

    Luis Daniel Chao

    2017-07-01

    Full Text Available [es] En este artículo abordaremos el nacimiento del Centro de Ex Soldados Combatientes en Malvinas de Corrientes (CESCEM a partir de un análisis de su construcción identitaria. En la primera parte, nos enfocaremos en las definiciones sobre los soldados presentes en los medios correntinos, desde el fin de la guerra hasta el primer aniversario del cese al fuego entre argentinos y británicos (junio de 1982 y abril de 1983. Este primer nivel será entendido como las condiciones de emergencia de la narración, es decir como las huellas que marcarán el qué decir en las primeras discusiones y apariciones públicas del CESCEM. Posteriormente, nos centraremos en los debates internos (reflejados en las actas de las reuniones del organismo del Centro entre 1984 y 1987, para establecer ciertos posicionamientos que nos permitan hablar de un proceso de construcción identitaria en términos narrativos, es decir atendiendo a las formas en que se autodefinen y caracterizan los grupos. El segundo nivel se sostiene en el análisis de las tres dimensiones de lo identitario según Aboy Carlés (alteridad, representación y tradición a partir del discurso de los excombatientes. [en] This article will discuss the birth of ex-Soldiers Combatants Center in Malvinas (CESCEM from Corrientes beginning with an analysis of their identity construction. In the first part, we will focus on the definitions of the soldiers in the media since the end of the war until the first anniversary of the ceasefire between Argentine and British (June 1982 and April 1983. This first level will be treated as emergency conditions of the narrative of the first discussions and public appearances to the CESCEM. Subsequently, we will focus on internal debates and public appearances (recovered from local media to the Center between 1984 and 1987, to establish positions that we allow to speak of identity construction in narrative terms, that is to say the ways in which they define themselves

  15. Algunas aclaraciones acerca del conocimiento del singular.

    Directory of Open Access Journals (Sweden)

    Carlos Llano Cifuentes

    2013-11-01

    Full Text Available Llano tries to explain the main purpose of El Conocimiento del Singular, showing how the individuals about which the book is concerned are basically human individuals: people as decision makers.

  16. Ecosystem services science, practice, and policy: Perspectives from ACES, A Community on Ecosystem Services

    Science.gov (United States)

    Shapiro, Carl D.; Arthaud, Greg; Casey, Frank; Hogan, Dianna M.

    2015-01-01

    Ecosystem services are at a crossroad. The natural capital needed to produce them is diminishing (Millennium Ecosystem Assessment, 2005). At the same time, the science relating to their identification, production, and valuation is advancing. Examples of ecosystem services applications are abundant in the literature. In addition, the concept of ecosystem services and its applications are attracting attention and are becoming more visible. The concept of ecosystem services, however, is still not routinely applied to many natural resource management decisions.

  17. Nitrogen cycling process rates across urban ecosystems.

    Science.gov (United States)

    Reisinger, Alexander J; Groffman, Peter M; Rosi-Marshall, Emma J

    2016-09-21

    Nitrogen (N) pollution of freshwater, estuarine, and marine ecosystems is widespread and has numerous environmental and economic impacts. A portion of this excess N comes from urban watersheds comprised of natural and engineered ecosystems which can alter downstream N export. Studies of urban N cycling have focused on either specific ecosystems or on watershed-scale mass balances. Comparisons of specific N transformations across ecosystems are required to contextualize rates from individual studies. Here we reviewed urban N cycling in terrestrial, aquatic, and engineered ecosystems, and compared N processing in these urban ecosystem types to native reference ecosystems. We found that net N mineralization and net nitrification rates were enhanced in urban forests and riparian zones relative to reference ecosystems. Denitrification was highly variable across urban ecosystem types, but no significant differences were found between urban and reference denitrification rates. When focusing on urban streams, ammonium uptake was more rapid than nitrate uptake in urban streams. Additionally, reduction of stormwater runoff coupled with potential decreases in N concentration suggests that green infrastructure may reduce downstream N export. Despite multiple environmental stressors in urban environments, ecosystems within urban watersheds can process and transform N at rates similar to or higher than reference ecosystems. © FEMS 2016. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  18. Merging Platform Ecosystems in Technology Acquisitions

    DEFF Research Database (Denmark)

    Dowie, Jamie; Henningsson, Stefan; Kude, Thomas

    2017-01-01

    of the merging companies. Given the increasing importance of platforms and value co-creation with third-party providers for companies making technology acquisitions, we complement existing literature by reframing the analysis of technology acquisitions to include the merger of the broader partner ecosystems....... Specifically, we draw on theories of ecosystem governance to analyze how ecosystem tensions unfolded during the ecosystem merger and how the acquirer governed these tensions in SAP SE’s acquisition of the e-commerce provider Hybris AG. Our findings suggest that the governance of ecosystem tensions...... is an important aspect of managing technology acquisitions. We identify the pre-acquisition relation between the acquired company’s ecosystem partners and the acquirer as an important context factor for explaining how a partner company is exposed to the ecosystem tensions during the merger....

  19. Implementing the optimal provision of ecosystem services.

    Science.gov (United States)

    Polasky, Stephen; Lewis, David J; Plantinga, Andrew J; Nelson, Erik

    2014-04-29

    Many ecosystem services are public goods whose provision depends on the spatial pattern of land use. The pattern of land use is often determined by the decisions of multiple private landowners. Increasing the provision of ecosystem services, though beneficial for society as a whole, may be costly to private landowners. A regulator interested in providing incentives to landowners for increased provision of ecosystem services often lacks complete information on landowners' costs. The combination of spatially dependent benefits and asymmetric cost information means that the optimal provision of ecosystem services cannot be achieved using standard regulatory or payment for ecosystem services approaches. Here we show that an auction that sets payments between landowners and the regulator for the increased value of ecosystem services with conservation provides incentives for landowners to truthfully reveal cost information, and allows the regulator to implement the optimal provision of ecosystem services, even in the case with spatially dependent benefits and asymmetric information.

  20. Controls on winter ecosystem respiration in temperate and boreal ecosystems

    Directory of Open Access Journals (Sweden)

    T. Wang

    2011-07-01

    Full Text Available Winter CO2 fluxes represent an important component of the annual carbon budget in northern ecosystems. Understanding winter respiration processes and their responses to climate change is also central to our ability to assess terrestrial carbon cycle and climate feedbacks in the future. However, the factors influencing the spatial and temporal patterns of winter ecosystem respiration (Reco of northern ecosystems are poorly understood. For this reason, we analyzed eddy covariance flux data from 57 ecosystem sites ranging from ~35° N to ~70° N. Deciduous forests were characterized by the highest winter Reco rates (0.90 ± 0.39 g C m−2 d−1, when winter is defined as the period during which daily air temperature remains below 0 °C. By contrast, arctic wetlands had the lowest winter Reco rates (0.02 ± 0.02 g C m−2 d−1. Mixed forests, evergreen needle-leaved forests, grasslands, croplands and boreal wetlands were characterized by intermediate winter Reco rates (g C m−2 d−1 of 0.70(±0.33, 0.60(±0.38, 0.62(±0.43, 0.49(±0.22 and 0.27(±0.08, respectively. Our cross site analysis showed that winter air (Tair and soil (Tsoil temperature played a dominating role in determining the spatial patterns of winter Reco in both forest and managed ecosystems (grasslands and croplands. Besides temperature, the seasonal amplitude of the leaf area index (LAI, inferred from satellite observation, or growing season gross primary productivity, which we use here as a proxy for the amount of recent carbon available for Reco in the subsequent winter, played a marginal role in winter CO2 emissions from forest ecosystems. We found that winter Reco sensitivity to temperature variation across space (

  1. Uncovering ecosystem service bundles through social preferences.

    Directory of Open Access Journals (Sweden)

    Berta Martín-López

    Full Text Available Ecosystem service assessments have increasingly been used to support environmental management policies, mainly based on biophysical and economic indicators. However, few studies have coped with the social-cultural dimension of ecosystem services, despite being considered a research priority. We examined how ecosystem service bundles and trade-offs emerge from diverging social preferences toward ecosystem services delivered by various types of ecosystems in Spain. We conducted 3,379 direct face-to-face questionnaires in eight different case study sites from 2007 to 2011. Overall, 90.5% of the sampled population recognized the ecosystem's capacity to deliver services. Formal studies, environmental behavior, and gender variables influenced the probability of people recognizing the ecosystem's capacity to provide services. The ecosystem services most frequently perceived by people were regulating services; of those, air purification held the greatest importance. However, statistical analysis showed that socio-cultural factors and the conservation management strategy of ecosystems (i.e., National Park, Natural Park, or a non-protected area have an effect on social preferences toward ecosystem services. Ecosystem service trade-offs and bundles were identified by analyzing social preferences through multivariate analysis (redundancy analysis and hierarchical cluster analysis. We found a clear trade-off among provisioning services (and recreational hunting versus regulating services and almost all cultural services. We identified three ecosystem service bundles associated with the conservation management strategy and the rural-urban gradient. We conclude that socio-cultural preferences toward ecosystem services can serve as a tool to identify relevant services for people, the factors underlying these social preferences, and emerging ecosystem service bundles and trade-offs.

  2. Wildfires, soil carbon balance and resilient organic matter in Mediterranean ecosystems. A review Los incendios forestales, el balance de carbono en el suelo y la materia orgánica resiliente en ecosistemas mediterráneos. Una revision Incêndios florestais, balanço do carbono no solo e matéria orgânica resiliente em ecossistemas mediterrânicos. Uma revisâo

    Directory of Open Access Journals (Sweden)

    Gonzalo Almendros

    2012-07-01

    principales efectos sistemáticos del fuego sobre la materia orgánica incluyen cambios en su solubilidad y propiedades coloidales, así como degradación térmica selectiva, condensaciones estructurales y ciclación de formas de C y N en el suelo. Estos efectos, en conjunto, se consideran responsables del aumento en la diversidad química de la materia orgánica debido a la generación térmica de nuevos compuestos inexistentes en los correspondientes suelos no afectados por el fuego. Además de ello, deben considerarse los efectos no sistemáticos del fuego, que dependen de las condiciones ambientales locales y la amplia diversidad de los tipos de incendios. También se discuten los resultados de estudios sobre efectos del fuego en experimentos de simulación en laboratorio, que constituyen una aproximación experimental indispensable para diferenciar los efectos intrínsecos de los incendios en el suelo de aquellos producidos por aportes de necromasa carbonizada. Finalmente, se revisan los efectos del fuego en la estructura molecular de las sustancias húmicas, que pueden ser asociadas con cambios en las propiedades de los suelos, en particular respecto a la resistencia a la biodegradación, capacidad de intercambio catiónico, disponibilidad de N, repelencia al agua y estabilidad de los agregados del suelo.

    Neste estudo faz-se uma revisão dos efeitos dos incêndios florestais nos solos mediterrânicos dando particular enfase aos efeitos nos processos biogeoquímicos de acumulação e sequestro de C no solo. Por outro lado, revem-se os aspectos relacionados com os efeitos dos incêndios sobre a composição e propriedades das substâncias húmicas e outras formas resilientes de C no solo. Os principais efeitos sistemáticos do fogo sobre a matéria orgânica incluem alterações da sua solubilidade e propriedades coloidais, bem como degradação térmica selectiva e condensação e ciclagem das formas de C e N no solo. Estes efeitos

  3. Psicodrama del duelo.

    OpenAIRE

    José Antonio Espina Barrio; Marisol Filgueira Bouza

    1997-01-01

    La pérdida de rituales agrava y alarga la reacción del duelo. Se define el Psicodrama Antropológico y su intervención en el proceso del duelo. El Psicodrama Focal del Duelo es una psicoterapia breve centrada en el proceso de Duelo. Se comentan varios casos y resultados. Se concluye con un programa sencillo para el duelo en Atención Primaria.

  4. Fractura triple del complejo suspensorio del hombro

    Directory of Open Access Journals (Sweden)

    Eraclio Delgado Rifá

    2015-06-01

    Full Text Available El complejo suspensorio del hombro es una estructura sumamente importante, compuesta por un anillo de huesos y tejidos blandos. Las lesiones aisladas de este complejo anatómico son frecuentes y no afectan su estabilidad. La interrupción doble conduce a la inestabilidad de esta estructura y usualmente requiere tratamiento quirúrgico. La triple interrupción, por su parte, es sumamente rara y es encontrada en casos de trauma de alta energía a menudo en asociación con otras lesiones. Se presenta una triple lesión del complejo suspensorio del hombro en un paciente de 46 años de edad, con una fractura de la glenoides, del acromion tipo III de Kuhn y de la coracoides tipo II de Ogawa. En este caso, la fractura del acromion fue tratada con fijación percutánea con alambres de Kirschner, por tener asociado lesiones de partes blandas que contraindicaron la reducción abierta. La fractura de la glenoides y de la apófisis coracoides fueron tratadas conservadoramente. Después de 6 meses de evolución, el paciente tuvo un resultado funcional aceptable, con una abducción de 90 grados, los 30 grados de rotación externa y 70 de rotación interna, además asintomático y consolidación de todas las fracturas. A pesar de ser catalogada de una lesión grave del cinturón escapular y estar asociada a otras lesiones se obtuvo un resultado satisfactorio al final del tratamiento.

  5. Inconsistencias contaminantes: gobernación electoral y conflicto poselectoral en las elecciones presidenciales del 2006 en México

    Directory of Open Access Journals (Sweden)

    Andreas SCHEDLER

    2010-03-01

    Full Text Available RESUMEN: Cuando partidos o candidatos derrotados rechazan el resultado de una elección, casi invariablemente aseveran haber sido víctimas de fraude. La democracia les exige aceptar su derrota, el fraude los libera de esta exigencia. En muchos casos, es difícil para ciudadanos y observadores evaluar la veracidad de sus acusaciones. Como argumenta el presente ensayo, la presencia de inconsistencias en el ámbito de la gobernación electoral tiende a alimentar el fuego del conflicto poselectoral de manera significativa. Las inconsistencias hacen que sea muy fácil sembrar dudas sobre la elección y muy complicado despejarlas. Para ilustrar su efecto contaminante, el ensayo examina de manera detallada las inconsistencias administrativas y judiciales que alimentaron las acusaciones de fraude en la controvertida elección presidencial del año 2006 en México. ABSTRACT: Losing parties or candidates almost invariably claim to be victims of fraud when they refuse to accept the results of an election. Democracy demands that losers consent to their defeat; fraud sets them free to reject it. In many cases, though, citizens and observers have a difficult time in assessing the veracity of their claims. As the present essay argues, the presence of inconsistencies in the realm of electoral governance tends to significantly aggravate such postelectoral disputes. To illustrate their contaminating consequences, the essay closely examines the administrative and judicial inconsistencies that fed allegations of fraud in the controversial 2006 presidential elections in Mexico.

  6. Inconsistencias contaminantes: gobernación electoral y conflicto poselectoral en las elecciones presidenciales del 2006 en México

    Directory of Open Access Journals (Sweden)

    Andreas SCHEDLER

    2009-08-01

    Full Text Available RESUMEN: Cuando partidos o candidatos derrotados rechazan el resultado de una elección, casi invariablemente aseveran haber sido víctimas de fraude. La democracia les exige aceptar su derrota, el fraude los libera de esta exigencia. En muchos casos, es difícil para ciudadanos y observadores evaluar la veracidad de sus acusaciones. Como argumenta el presente ensayo, la presencia de inconsistencias en el ámbito de la gobernación electoral tiende a alimentar el fuego del conflicto poselectoral de manera significativa. Las inconsistencias hacen que sea muy fácil sembrar dudas sobre la elección y muy complicado despejarlas. Para ilustrar su efecto contaminante, el ensayo examina de manera detallada las inconsistencias administrativas y judiciales que alimentaron las acusaciones de fraude en la controvertida elección presidencial del año 2006 en México. ABSTRACT: Losing parties or candidates almost invariably claim to be victims of fraud when they refuse to accept the results of an election. Democracy demands that losers consent to their defeat; fraud sets them free to reject it. In many cases, though, citizens and observers have a difficult time in assessing the veracity of their claims. As the present essay argues, the presence of inconsistencies in the realm of electoral governance tends to significantly aggravate such postelectoral disputes. To illustrate their contaminating consequences, the essay closely examines the administrative and judicial inconsistencies that fed allegations of fraud in the controversial 2006 presidential elections in Mexico.

  7. Ecosystem service valuations of mangrove ecosystems to inform decision making and future valuation exercises.

    Directory of Open Access Journals (Sweden)

    Nibedita Mukherjee

    Full Text Available The valuation of ecosystem services is a complex process as it includes several dimensions (ecological, socio-cultural and economic and not all of these can be quantified in monetary units. The aim of this paper is to conduct an ecosystem services valuation study for mangroves ecosystems, the results of which can be used to inform governance and management of mangroves. We used an expert-based participatory approach (the Delphi technique to identify, categorize and rank the various ecosystem services provided by mangrove ecosystems at a global scale. Subsequently we looked for evidence in the existing ecosystem services literature for monetary valuations of these ecosystem service categories throughout the biogeographic distribution of mangroves. We then compared the relative ranking of ecosystem service categories between the monetary valuations and the expert based analysis. The experts identified 16 ecosystem service categories, six of which are not adequately represented in the literature. There was no significant correlation between the expert based valuation (the Delphi technique and the economic valuation, indicating that the scope of valuation of ecosystem services needs to be broadened. Acknowledging this diversity in different valuation approaches, and developing methodological frameworks that foster the pluralism of values in ecosystem services research, are crucial for maintaining the credibility of ecosystem services valuation. To conclude, we use the findings of our dual approach to valuation to make recommendations on how to assess and manage the ecosystem services provided by mangrove ecosystems.

  8. Ecosystem services as a common language for coastal ecosystem-based management.

    Science.gov (United States)

    Granek, Elise F; Polasky, Stephen; Kappel, Carrie V; Reed, Denise J; Stoms, David M; Koch, Evamaria W; Kennedy, Chris J; Cramer, Lori A; Hacker, Sally D; Barbier, Edward B; Aswani, Shankar; Ruckelshaus, Mary; Perillo, Gerardo M E; Silliman, Brian R; Muthiga, Nyawira; Bael, David; Wolanski, Eric

    2010-02-01

    Ecosystem-based management is logistically and politically challenging because ecosystems are inherently complex and management decisions affect a multitude of groups. Coastal ecosystems, which lie at the interface between marine and terrestrial ecosystems and provide an array of ecosystem services to different groups, aptly illustrate these challenges. Successful ecosystem-based management of coastal ecosystems requires incorporating scientific information and the knowledge and views of interested parties into the decision-making process. Estimating the provision of ecosystem services under alternative management schemes offers a systematic way to incorporate biogeophysical and socioeconomic information and the views of individuals and groups in the policy and management process. Employing ecosystem services as a common language to improve the process of ecosystem-based management presents both benefits and difficulties. Benefits include a transparent method for assessing trade-offs associated with management alternatives, a common set of facts and common currency on which to base negotiations, and improved communication among groups with competing interests or differing worldviews. Yet challenges to this approach remain, including predicting how human interventions will affect ecosystems, how such changes will affect the provision of ecosystem services, and how changes in service provision will affect the welfare of different groups in society. In a case study from Puget Sound, Washington, we illustrate the potential of applying ecosystem services as a common language for ecosystem-based management.

  9. Ecosystem service valuations of mangrove ecosystems to inform decision making and future valuation exercises.

    Science.gov (United States)

    Mukherjee, Nibedita; Sutherland, William J; Dicks, Lynn; Hugé, Jean; Koedam, Nico; Dahdouh-Guebas, Farid

    2014-01-01

    The valuation of ecosystem services is a complex process as it includes several dimensions (ecological, socio-cultural and economic) and not all of these can be quantified in monetary units. The aim of this paper is to conduct an ecosystem services valuation study for mangroves ecosystems, the results of which can be used to inform governance and management of mangroves. We used an expert-based participatory approach (the Delphi technique) to identify, categorize and rank the various ecosystem services provided by mangrove ecosystems at a global scale. Subsequently we looked for evidence in the existing ecosystem services literature for monetary valuations of these ecosystem service categories throughout the biogeographic distribution of mangroves. We then compared the relative ranking of ecosystem service categories between the monetary valuations and the expert based analysis. The experts identified 16 ecosystem service categories, six of which are not adequately represented in the literature. There was no significant correlation between the expert based valuation (the Delphi technique) and the economic valuation, indicating that the scope of valuation of ecosystem services needs to be broadened. Acknowledging this diversity in different valuation approaches, and developing methodological frameworks that foster the pluralism of values in ecosystem services research, are crucial for maintaining the credibility of ecosystem services valuation. To conclude, we use the findings of our dual approach to valuation to make recommendations on how to assess and manage the ecosystem services provided by mangrove ecosystems.

  10. La fuerza del espíritu (fe en el camino (ancestral indígena

    Directory of Open Access Journals (Sweden)

    Paola Andrea Pérez Gil

    2016-01-01

    Full Text Available El mundo de hoy se encuentra encerrado en la visión reduccionista y enajenada que ha sido imperante a lo largo de la historia, el valor del consumo, la ambición y el individualismo han enterrado los valores fundantes de sencillez, humildad y honestidad. La profunda necesidad de volver la mirada al conocimiento y psicología propios, ha hecho que retornemos a la sabiduría de las plantas, los abuelos, lugares sagrados, costumbres y mitos para abandonar la ilusión racionalista que todo lo divide, todo lo niega y nada lo contempla. El camino recorrido en el fuego, la montaña, Sie, el chunsúa, las cansamarias, permite mirar, recordar y recuperar lo fundamental en la existencia humana: su propia fuerza, la fe. Esa que sostiene la vida, que va más allá de verificación o comprobación alguna, que es cultivada en la palabra dulce, el tejido sentido y la esencia misma. Conectando al humano en sus diferentes niveles, a su psiquismo, conectándolo al amor. Por ello, la importancia de vivenciar a Sue, Chía, en y con la Hytcha Guaia, vivenciar al Espíritu en su expresión más latente, aceptar al ego como uno de los maestros para comprender el ser, integrar la materia y lo trascendente, entregarse a la ley de los abuelos, a lo sagrado propio, a la conciencia profunda, al guerrero interno, a la vida misma.

  11. Vigencia del Darwinismo

    OpenAIRE

    Lessa, Enrique P

    2009-01-01

    En este ensayo se presenta una revisión histórica del signifcado y legado del darwinismo, con énfasis en el último siglo. La principal conclusión es que la visión darwiniana de la evolución, con las modifcaciones requeridas para dar cuenta de los grandes desarrollos de la disciplina, se ha impuesto y mantiene vigencia en nuestros días. En particular, el papel del azar, la evolución como proceso de “descendencia con modifcación” a lo largo de diversas ramas del árbol de la vida, el pensamiento...

  12. Dynamic behaviour of lagoon ecosystems

    International Nuclear Information System (INIS)

    Cioffi, F.

    2008-01-01

    The dynamic behaviour of primary producers in coastal lagoons due to change of external control parameters, phosphorous external load and maximum tidal flow rate, is investigated by using a eutrophication model. The eutrophication model allows the simulation of the temporal evolution of the concentration of the following species: a) in the water column: dissolved oxygen, vegetal organic carbon, particulate and dissolved organic carbon, dissolved phosphorous and hydrogen sulphide; b) in sediments: dissolved oxygen, particulate and dissolved organic carbon, dissolved and adsorbed phosphorous, hydrogen sulphide. The vegetal organic carbon is distinguished in three components related to the main groups of primary producers, namely eel grass, macro algae and microalgae, having different modalities of nutrient uptake and kinetics parameters depending on the S/V ratio. Diagrams representing the ecosystems dynamic response to the changes of the control parameters were constructed by simulations. The response diagrams suggest the existence of regime shifts which border different ecosystem stability ranges, characterized by the dominance of a specific group of primary producers and by different ecosystem vulnerability at summer water anoxia. A catastrophic bifurcation or abrupt regime shift, evidenced by Poincare sections obtained mapping, at a prefixed time period, the values of the concentration of the species, occurs for a critical value of the control parameter and manifests itself as an abrupt change of the dominant species from eel grass to macro algae. An analogous abrupt change from eel grass to macro algae occurs for a critical value of the tidal flowrate assumed as control parameter in simulations conducted for an assigned value of external phosphorous load.

  13. Predicting Ecosystem Alliances Using Landscape Theory

    Directory of Open Access Journals (Sweden)

    Shruti Satsangi

    2012-08-01

    Full Text Available Previous articles in the TIM Review have covered various aspects of the concept of business ecosystems, from the types of ecosystems to keystone strategy, to different member roles and value co-creation. While there is no dearth of suggested best practices that organizations should follow as ecosystem members, it can be difficult to apply these insights into actionable steps for them to take. This is especially true when the ecosystem members already have a prior history of cooperation or competition with each other, as opposed to where a new ecosystem is created. Landscape theory, a political science approach to predicting coalition formation and strategic alliances, can be a useful complement to ecosystems studies by providing a tool to evaluate the best possible alliance options for an organization, given information about itself and the other companies in the system. As shown in the case study of mobile device manufacturers choosing platform providers in the mobile ecosystem, this tool is highly flexible and customizable, with more data providing a more accurate view of the alliances in the ecosystem. At the same time, with even basic parameters, companies can glean significant information about which coalitions will best serve their interest and overall standing within the ecosystem. This article shows the synergies between landscape theory and an ecosystems approach and offers a practical, actionable way in which to analyze individual member benefits.

  14. Pteropods in Southern Ocean ecosystems

    Science.gov (United States)

    Hunt, B. P. V.; Pakhomov, E. A.; Hosie, G. W.; Siegel, V.; Ward, P.; Bernard, K.

    2008-09-01

    To date, little research has been carried out on pelagic gastropod molluscs (pteropods) in Southern Ocean ecosystems. However, recent predictions are that, due to acidification resulting from a business as usual approach to CO 2 emissions (IS92a), Southern Ocean surface waters may begin to become uninhabitable for aragonite shelled thecosome pteropods by 2050. To gain insight into the potential impact that this would have on Southern Ocean ecosystems, we have here synthesized available data on pteropod distributions and densities, assessed current knowledge of pteropod ecology, and highlighted knowledge gaps and directions for future research on this zooplankton group. Six species of pteropod are typical of the Southern Ocean south of the Sub-Tropical Convergence, including the four Thecosomes Limacina helicina antarctica, Limacina retroversa australis, Clio pyramidata, and Clio piatkowskii, and two Gymnosomes Clione limacina antarctica and Spongiobranchaea australis. Limacina retroversa australis dominated pteropod densities north of the Polar Front (PF), averaging 60 ind m -3 (max = 800 ind m -3) and 11% of total zooplankton at the Prince Edward Islands. South of the PF L. helicina antarctica predominated, averaging 165 ind m -3 (max = 2681 ind m -3) and up to >35% of total zooplankton at South Georgia, and up to 1397 ind m -3 and 63% of total zooplankton in the Ross Sea. Combined pteropods contributed 40% of community grazing impact. Further research is required to quantify diet selectivity, the effect of phytoplankton composition on growth and reproductive success, and the role of carnivory in thecosomes. Life histories are a significant knowledge gap for Southern Ocean pteropods, a single study having been completed for L. retroversa australis, making population studies a priority for this group. Pteropods appear to be important in biogeochemical cycling, thecosome shells contributing >50% to carbonate flux in the deep ocean south of the PF. Pteropods may also

  15. Environmental Impacts—Marine Ecosystems

    DEFF Research Database (Denmark)

    Brander, Keith; Ottersen, Geir; Bakker, J.P.

    2016-01-01

    This chapter presents a review of what is known about the impacts of climate change on the biota (plankton, benthos, fish, seabirds and marine mammals) of the North Sea. Examples show how the changing North Sea environment is affecting biological processes and organisation at all scales, including...... the physiology, reproduction, growth, survival, behaviour and transport of individuals; the distribution, dynamics and evolution of populations; and the trophic structure and coupling of ecosystems. These complex responses can be detected because there are detailed long-term biological and environmental records...

  16. Millennium ecosystem assessment: research needs

    CSIR Research Space (South Africa)

    Carpenter, SR

    2006-10-01

    Full Text Available changes. Millennium Ecosystem Assessment: Research Needs ECOLOGY C r o s s - s c a l e p r o c e s s e s Human well-being Healt h, ba sic ne eds, incom e, sec urity, freed om, s ocial relat ions Direct drivers... Foundation, Los Altos, CA 94022, USA. †Author for correspondence. E-mail: hmooney@stanford.edu Stephen R. Carpenter,1 Ruth DeFries,2 Thomas Dietz,3 Harold A. Mooney,4† Stephen Polasky,5 Walter V. Reid,6* Robert J. Scholes7 Enhanced online at www...

  17. Establishing IUCN Red List Criteria for Threatened Ecosystems

    Science.gov (United States)

    Rodríguez, Jon Paul; Rodríguez-Clark, Kathryn M; Baillie, Jonathan E M; Ash, Neville; Benson, John; Boucher, Timothy; Brown, Claire; Burgess, Neil D; Collen, Ben; Jennings, Michael; Keith, David A; Nicholson, Emily; Revenga, Carmen; Reyers, Belinda; Rouget, Mathieu; Smith, Tammy; Spalding, Mark; Taber, Andrew; Walpole, Matt; Zager, Irene; Zamin, Tara

    2011-01-01

    Abstract The potential for conservation of individual species has been greatly advanced by the International Union for Conservation of Nature's (IUCN) development of objective, repeatable, and transparent criteria for assessing extinction risk that explicitly separate risk assessment from priority setting. At the IV World Conservation Congress in 2008, the process began to develop and implement comparable global standards for ecosystems. A working group established by the IUCN has begun formulating a system of quantitative categories and criteria, analogous to those used for species, for assigning levels of threat to ecosystems at local, regional, and global levels. A final system will require definitions of ecosystems; quantification of ecosystem status; identification of the stages of degradation and loss of ecosystems; proxy measures of risk (criteria); classification thresholds for these criteria; and standardized methods for performing assessments. The system will need to reflect the degree and rate of change in an ecosystem's extent, composition, structure, and function, and have its conceptual roots in ecological theory and empirical research. On the basis of these requirements and the hypothesis that ecosystem risk is a function of the risk of its component species, we propose a set of four criteria: recent declines in distribution or ecological function, historical total loss in distribution or ecological function, small distribution combined with decline, or very small distribution. Most work has focused on terrestrial ecosystems, but comparable thresholds and criteria for freshwater and marine ecosystems are also needed. These are the first steps in an international consultation process that will lead to a unified proposal to be presented at the next World Conservation Congress in 2012. Establecimiento de Criterios para la Lista Roja de UICN de Ecosistemas Amenazados Resumen El potencial para la conservación de muchas especies ha avanzado enormemente

  18. Las comunidades de insectos del Parque Regional de la Cuenca Alta del Manzanares (centro de España: estado de conservación

    Directory of Open Access Journals (Sweden)

    Martín Cano, J.

    1995-12-01

    Full Text Available The Parque Regional de la Cuenca Alta del Manzanares (PRCAM is a protected area at the North of Madrid. Eight sampling sites were selected representing different ecosystems and land uses. In these sites we studied the communities of four insect groups: Collembolla, Chrysomelida, Curculionoidea and Papilionoidea and Hesperioidea. The objetive of the study was to assess the conservation status of the Park ecosystems and the paralelism of the results in these four insect groups. The results show that the Park ecosystems are heavily disturbed. The lowland areas being damaged to a greater extent. On the other hand the four groups have a different behaviour in similar conditions. This shows the importance of gathering information from different groups in order to assess or manage the biological diversity of an area.

    El Parque Regional de la Cuenca Alta del Manzanares (PRCAM es un área protegida del norte de Madrid. En el se han elegido ocho puntos representativos de sus ecosistemas y del uso del territorio. En estos puntos se han estudiado las comunidades de cuatro grupos de insectos: Colémbolos, Crisomélidos, Curculiónidos y Mariposas. El objetivo del estudio es valorar el estado de conservación de los ecosistemas del parque, y el grado de paralelismo de la información suministrada por los cuatro grupos de insectos sobre unas mismas áreas. Los resultados indican que los ecosistemas del Parque están muy alterados. El grado de deterioro es mayor en las zonas de menor altitud. Por otro lado las comunidades de estos cuatro grupos de insectos responden de formas distintas ante situaciones idénticas. De ello se deduce la importancia de tener en cuenta varios grupos de organismos a la hora de manejar o valorar la diversidad biológica de un zona.

  19. Poverty, development, and Himalayan ecosystems.

    Science.gov (United States)

    Sandhu, Harpinder; Sandhu, Sukhbir

    2015-05-01

    The Himalayas are rich in biodiversity but vulnerable to anthropogenic pressures. They are also host to growing number of rural poor who are dependent on forest and ecosystem services for their livelihood. Local and global efforts to integrate poverty alleviation and biodiversity conservation in the Himalayas remain elusive so far. In this work, we highlight two key impediments in achieving sustainable development in the Himalayas. On the positive side, we also highlight the work of Ashoka Trust for Research in Ecology and the Environment (ATREE), a research organization based in India that seeks to integrate biodiversity concerns with livelihood security. For impediments, we draw on two examples from the Darjeeling district, India, in Eastern Himalayan region to illustrate how development organizations are failing to simultaneously address poverty and environmental issues. Based on the success of ATREE, we then propose a conceptual framework to integrate livelihood generating activities with sustainable and equitable development agenda. We recommend developing a Hindu-Kush Himalayan Ecosystem Services Network in the region to formulate a strategy for further action. We conclude by offering measures to address the challenge of integrating livelihood and environment issues through this network.

  20. Nitrogen saturation in stream ecosystems.

    Science.gov (United States)

    Earl, Stevan R; Valett, H Maurice; Webster, Jackson R

    2006-12-01

    The concept of nitrogen (N) saturation has organized the assessment of N loading in terrestrial ecosystems. Here we extend the concept to lotic ecosystems by coupling Michaelis-Menten kinetics and nutrient spiraling. We propose a series of saturation response types, which may be used to characterize the proximity of streams to N saturation. We conducted a series of short-term N releases using a tracer (15NO3-N) to measure uptake. Experiments were conducted in streams spanning a gradient of background N concentration. Uptake increased in four of six streams as NO3-N was incrementally elevated, indicating that these streams were not saturated. Uptake generally corresponded to Michaelis-Menten kinetics but deviated from the model in two streams where some other growth-critical factor may have been limiting. Proximity to saturation was correlated to background N concentration but was better predicted by the ratio of dissolved inorganic N (DIN) to soluble reactive phosphorus (SRP), suggesting phosphorus limitation in several high-N streams. Uptake velocity, a reflection of uptake efficiency, declined nonlinearly with increasing N amendment in all streams. At the same time, uptake velocity was highest in the low-N streams. Our conceptual model of N transport, uptake, and uptake efficiency suggests that, while streams may be active sites of N uptake on the landscape, N saturation contributes to nonlinear changes in stream N dynamics that correspond to decreased uptake efficiency.

  1. Ecosystem Based Business Model of Smart Grid

    DEFF Research Database (Denmark)

    Lundgaard, Morten Raahauge; Ma, Zheng; Jørgensen, Bo Nørregaard

    2015-01-01

    This paper tries to investigate the ecosystem based business model in a smart grid infrastructure and the potential of value capture in the highly complex macro infrastructure such as smart grid. This paper proposes an alternative perspective to study the smart grid business ecosystem to support...... the infrastructural challenges, such as the interoperability of business components for smart grid. So far little research has explored the business ecosystem in the smart grid concept. The study on the smart grid with the theory of business ecosystem may open opportunities to understand market catalysts. This study...... contributes an understanding of business ecosystem applicable for smart grid. Smart grid infrastructure is an intricate business ecosystem, which have several intentions to deliver the value proposition and what it should be. The findings help to identify and capture value from markets....

  2. Biodiversity and Resilience of Ecosystem Functions.

    Science.gov (United States)

    Oliver, Tom H; Heard, Matthew S; Isaac, Nick J B; Roy, David B; Procter, Deborah; Eigenbrod, Felix; Freckleton, Rob; Hector, Andy; Orme, C David L; Petchey, Owen L; Proença, Vânia; Raffaelli, David; Suttle, K Blake; Mace, Georgina M; Martín-López, Berta; Woodcock, Ben A; Bullock, James M

    2015-11-01

    Accelerating rates of environmental change and the continued loss of global biodiversity threaten functions and services delivered by ecosystems. Much ecosystem monitoring and management is focused on the provision of ecosystem functions and services under current environmental conditions, yet this could lead to inappropriate management guidance and undervaluation of the importance of biodiversity. The maintenance of ecosystem functions and services under substantial predicted future environmental change (i.e., their 'resilience') is crucial. Here we identify a range of mechanisms underpinning the resilience of ecosystem functions across three ecological scales. Although potentially less important in the short term, biodiversity, encompassing variation from within species to across landscapes, may be crucial for the longer-term resilience of ecosystem functions and the services that they underpin. Copyright © 2015 Elsevier Ltd. All rights reserved.

  3. Linking ecosystem services with cultural landscape research

    DEFF Research Database (Denmark)

    Schaich, Harald; Biding, Claudia; Plieninger, Tobias

    2010-01-01

    The concept of ecosystem services facilitates the valuation of the multiple services from ecosystems and landscapes, the identification of trade-offs between different land use scenarios, and also informs decision making in land use planning. Unfortunately, cultural services have been mostly...... neglected within the ecosystem services framework. This could result in trade-off assessments which are biased and mislead ecosystem management and landscape planning. However, cultural landscape research approaches have proven valuable in the assessment of different nonmaterial landscape values...... and cultural services. In this paper, we compare the objectives, approaches, and methodologies adopted by ecosystem services research and cultural landscape research through a bibliographic research. Both research communities investigate the human dimension of ecosystems and landscapes and, hence, study...

  4. A Size-based Ecosystem Model

    DEFF Research Database (Denmark)

    Ravn-Jonsen, Lars

     Ecosystem Management requires models that can link the ecosystem level to the operation level. This link can be created by an ecosystem production model. Because the function of the individual fish in the marine ecosystem, seen in trophic context, is closely related to its size, the model groups...... fish according to size. The model summarises individual predation events into ecosystem level properties, and thereby uses the law of conversation of mass as a framework. This paper provides the background, the conceptual model, basic assumptions, integration of fishing activities, mathematical...... the predator--prey interaction, (ii) mass balance in the predator--prey allocation, and (iii) mortality and somatic growth as a consequence of the predator--prey allocation. By incorporating additional assumptions, the model can be extended to other dimensions of the ecosystem, for example, space or species...

  5. National Ecosystem Assessments in Europe: A Review

    Science.gov (United States)

    Schröter, Matthias; Albert, Christian; Marques, Alexandra; Tobon, Wolke; Lavorel, Sandra; Maes, Joachim; Brown, Claire; Klotz, Stefan; Bonn, Aletta

    2016-01-01

    Abstract National ecosystem assessments form an essential knowledge base for safeguarding biodiversity and ecosystem services. We analyze eight European (sub-)national ecosystem assessments (Portugal, United Kingdom, Spain, Norway, Flanders, Netherlands, Finland, and Germany) and compare their objectives, political context, methods, and operationalization. We observed remarkable differences in breadth of the assessment, methods employed, variety of services considered, policy mandates, and funding mechanisms. Biodiversity and ecosystem services are mainly assessed independently, with biodiversity conceptualized as underpinning services, as a source of conflict with services, or as a service in itself. Recommendations derived from our analysis for future ecosystem assessments include the needs to improve the common evidence base, to advance the mapping of services, to consider international flows of services, and to connect more strongly to policy questions. Although the context specificity of national ecosystem assessments is acknowledged as important, a greater harmonization across assessments could help to better inform common European policies and future pan-regional assessments. PMID:28533561

  6. La luz del origen del universo

    Directory of Open Access Journals (Sweden)

    Casas, Alberto

    2015-10-01

    Full Text Available Penzias and Wilson discovered the cosmic microwave background, a luminous echo of the Big Bang, in 1965. The amount of information encoded in this relic of the early universe is truly extraordinary. At present, the most precise data about the origin and structure of the universe comes from the study of this primordial light, the full potential of which has yet to be explored.En 1965 se descubrió el fondo de radiación de microondas, un eco luminoso de la Gran Explosión (Big Bang. La cantidad de información contenida en esta reliquia del universo primitivo es verdaderamente extraordinaria. En la actualidad los datos más precisos sobre el origen y estructura del universo provienen del estudio de esta luz primigenia, que aún no ha sido explorada en todo su potencial.

  7. Caracterización del suicidio en el departamento de Risaralda, Colombia, 2005-2010

    Directory of Open Access Journals (Sweden)

    José Adalberto Rodríguez Escobar

    2013-01-01

    Full Text Available Antecedentes. El suicidio es una de las primeras diez causasde mortalidad en el mundo. Las tasas están alrededor de 30/100mil habitantes en países desarrollados; en Suramérica oscilanentre 3 y 7 y en Colombia las tasas han fluctuado entre 3 y 5,sobresaliendo el rango de edad entre 15 y 29 años.Objetivos. Caracterizar el suicidio en el departamento deRisaralda entre 2005 – 2010.Materiales y métodos. Se realizó una investigación de tipocuantitativo y descriptiva, con información proveniente delInstituto Nacional de Medicina Legal y Ciencias Forenses,Seccional Pereira. Las tasas se calcularon con las proyeccionesde crecimiento poblacional del DANE.Resultados. Se encontró que en los seis años estudiados sepresentaron 363 suicidios, 83% en hombres y 17% en mujeres.El mecanismo más utilizado fue el ahorcamiento en un 38%,seguido del envenenamiento y arma de fuego con 26% y 25%,respectivamente. A nivel de tasas, el municipio con la ciframás alta fue Belén de Umbría, con 13,2/100.000 habitantes,mientras que el rango de edad más elevado se encontró entrelos 20 a 29 años con 13,2/100.000, seguida de los mayoresde 80 con 12,9/100.000 habitantes. Estas cifras sugieren lanecesidad de realizar mayores labores de prevención.Conclusión. El suicidio es una problemática de salud públicaen Risaralda, se ubica en un rango medio respecto a la poblaciónmundial y se destaca a nivel nacional entre las mayorestasas registradas, se identifican múltiples factores de riesgobiopsicosocial, en adulto joven y adulto mayor, por lo cual esindispensable fortalecer procesos de prevención e intervencióna diferentes niveles, con base en la intersectorialidad y responsabilidadsocial. Se requiere mayor investigación que faciliteel análisis de factores de riesgo, fragilidad y resiliencia y surelación con variables socioculturales.

  8. EVIDENCIA DEL IMPACTO HUMANO Y CAMBIO CLIMÁTICO NATURAL EN LA REGIÓN DE LOS TUXTLAS, VER.: UN ENFOQUE MULTIDISCIPLINARIO

    Directory of Open Access Journals (Sweden)

    Ma. del Socorro Lozano-García

    2007-01-01

    Full Text Available El estudio del cambio ambiental utilizando el registro de los indicadores en escalas temporales pasadas, aporta información sobre los diferentes factores que influyen en los ecosistemas. En este trabajo se presentan evidencias de actividad humana y cambio climático en la región tropical de la sierra de Los Tuxtlas, con base en el registro de indicadores de cambio ambiental para los últimos 2000 años. En la secuencia lacustre del Lago Verde, localizado en la porción norte del Golfo de México, se llevó a cabo el análisis de susceptibilidad magnética, carbón orgánico total, contenido de polen, diatomeas y partículas de carbón con el propósito de documentar el impacto humano y su efecto en el ambiente, así como, identificar las condiciones climáticas en la que se desarrollaron. Se identificaron dos etapas de actividad en la cuenca, la primera durante el Clásico en condiciones climáticas secas con una deforestación intensa, actividad agrícola, fuegos, eventos de erosión y niveles lacustres bajos. La segunda etapa a partir de 1960 se caracteriza por deforestación, actividad agrícola y en el lago hay niveles altos y condiciones eutróficas pero se desarrolla bajo escenarios climáticos diferentes.

  9. ESTIMAP: Ecosystem services mapping at European scale

    OpenAIRE

    ZULIAN GRAZIA; PARACCHINI Maria-Luisa; MAES JOACHIM; LIQUETE GARCIA MARIA DEL CAMINO

    2013-01-01

    Mapping, visualization and the access to suitable data as a means to facilitate the dialogue among scientists, policy makers and the general public are among the most challenging issues within current ecosystem service science and application. Recently the attention on spatially explicit ways to map ecosystem services, at local, regional and global scale is increasing. This report presents ESTIMAP: a suite of models for a spatially explicit assessment of three ecosystem services (recreati...

  10. Stormwater management and ecosystem services: a review

    Science.gov (United States)

    Prudencio, Liana; Null, Sarah E.

    2018-03-01

    Researchers and water managers have turned to green stormwater infrastructure, such as bioswales, retention basins, wetlands, rain gardens, and urban green spaces to reduce flooding, augment surface water supplies, recharge groundwater, and improve water quality. It is increasingly clear that green stormwater infrastructure not only controls stormwater volume and timing, but also promotes ecosystem services, which are the benefits that ecosystems provide to humans. Yet there has been little synthesis focused on understanding how green stormwater management affects ecosystem services. The objectives of this paper are to review and synthesize published literature on ecosystem services and green stormwater infrastructure and identify gaps in research and understanding, establishing a foundation for research at the intersection of ecosystems services and green stormwater management. We reviewed 170 publications on stormwater management and ecosystem services, and summarized the state-of-the-science categorized by the four types of ecosystem services. Major findings show that: (1) most research was conducted at the parcel-scale and should expand to larger scales to more closely understand green stormwater infrastructure impacts, (2) nearly a third of papers developed frameworks for implementing green stormwater infrastructure and highlighted barriers, (3) papers discussed ecosystem services, but less than 40% quantified ecosystem services, (4) no geographic trends emerged, indicating interest in applying green stormwater infrastructure across different contexts, (5) studies increasingly integrate engineering, physical science, and social science approaches for holistic understanding, and (6) standardizing green stormwater infrastructure terminology would provide a more cohesive field of study than the diverse and often redundant terminology currently in use. We recommend that future research provide metrics and quantify ecosystem services, integrate disciplines to

  11. Ecosystem Based Business Model of Smart Grid

    OpenAIRE

    Lundgaard, Morten Raahauge; Ma, Zheng; Jørgensen, Bo Nørregaard

    2015-01-01

    This paper tries to investigate the ecosystem based business model in a smart grid infrastructure and the potential of value capture in the highly complex macro infrastructure such as smart grid. This paper proposes an alternative perspective to study the smart grid business ecosystem to support the infrastructural challenges, such as the interoperability of business components for smart grid. So far little research has explored the business ecosystem in the smart grid concept. The study on t...

  12. Uncovering Ecosystem Service Bundles through Social Preferences

    Science.gov (United States)

    Martín-López, Berta; Iniesta-Arandia, Irene; García-Llorente, Marina; Palomo, Ignacio; Casado-Arzuaga, Izaskun; Amo, David García Del; Gómez-Baggethun, Erik; Oteros-Rozas, Elisa; Palacios-Agundez, Igone; Willaarts, Bárbara; González, José A.; Santos-Martín, Fernando; Onaindia, Miren; López-Santiago, Cesar; Montes, Carlos

    2012-01-01

    Ecosystem service assessments have increasingly been used to support environmental management policies, mainly based on biophysical and economic indicators. However, few studies have coped with the social-cultural dimension of ecosystem services, despite being considered a research priority. We examined how ecosystem service bundles and trade-offs emerge from diverging social preferences toward ecosystem services delivered by various types of ecosystems in Spain. We conducted 3,379 direct face-to-face questionnaires in eight different case study sites from 2007 to 2011. Overall, 90.5% of the sampled population recognized the ecosystem’s capacity to deliver services. Formal studies, environmental behavior, and gender variables influenced the probability of people recognizing the ecosystem’s capacity to provide services. The ecosystem services most frequently perceived by people were regulating services; of those, air purification held the greatest importance. However, statistical analysis showed that socio-cultural factors and the conservation management strategy of ecosystems (i.e., National Park, Natural Park, or a non-protected area) have an effect on social preferences toward ecosystem services. Ecosystem service trade-offs and bundles were identified by analyzing social preferences through multivariate analysis (redundancy analysis and hierarchical cluster analysis). We found a clear trade-off among provisioning services (and recreational hunting) versus regulating services and almost all cultural services. We identified three ecosystem service bundles associated with the conservation management strategy and the rural-urban gradient. We conclude that socio-cultural preferences toward ecosystem services can serve as a tool to identify relevant services for people, the factors underlying these social preferences, and emerging ecosystem service bundles and trade-offs. PMID:22720006

  13. Archivo del Duelo

    OpenAIRE

    Ferrera, Tamara

    2010-01-01

    Photos taken from the Archive of Mourning following the March 11 terrorist attacks El Archivo del Duelo. Creación de un archivo etnográfico de los Atentados del 11 de marzo en Madrid. Ministerio de Educación y Ciencia HUM2005-03490.

  14. Displasias del seno

    Directory of Open Access Journals (Sweden)

    Ernesto Andrade Valderrama

    1971-04-01

    Full Text Available En general, las Displasias no se presentan antes de la iniciación del estímulo Gonadal y tienden a desaparecer con el climaterio. Se definen entonces como las afecciones benignas del Seno, de origen endocrino.

  15. Aplicación de la entrevista cognoscitiva y de la entrevista judicial a un testigo víctima del delito de hurto

    Directory of Open Access Journals (Sweden)

    Déborah Johanna Manrique Pérez

    2006-01-01

    Full Text Available El testimonio continúa siendo uno de los principales medios de prueba. Tradicionalmente se ha obtenido con la entrevista judicial estándar, corriendo el riesgo de formular preguntas cerradas y sesgadas, hacer interrupciones y seguir una secuencia inapropiada de preguntas, entre otras. En este trabajo investigativo se estudia un método alternativo para obtener el testimonio, propuesto por autores como Geiselman y Fisher (1994, denominado entrevista cognoscitiva; este método agrupa cuatro técnicas generales de memoria, más unas estrategias complementarias para el recuerdo de detalles específicos. Se realizó un estudio de caso en el que se comparó la información obtenida con la aplicación de la entrevista judicial estándar y con la entrevista cognoscitiva a un testigo – víctima del delito de hurto con arma de fuego. Los resultados confirman la hipótesis que guía esta investigación: la entrevista cognoscitiva reporta un incremento en la información relacionada con personas, objetos y acontecimientos.

  16. Community and ecosystem responses to elevational gradients

    DEFF Research Database (Denmark)

    Sundqvist, Maja K.; Sanders, Nate; Wardle, David A.

    2013-01-01

    Community structure and ecosystem processes often vary along elevational gradients. Their responses to elevation are commonly driven by changes in temperature, and many community- and ecosystem-level variables therefore frequently respond similarly to elevation across contrasting gradients...... elevational gradients for understanding community and ecosystem responses to global climate change at much larger spatial and temporal scales than is possible through conventional ecological experiments. However, future studies that integrate elevational gradient approaches with experimental manipulations...... will provide powerful information that can improve predictions of climate change impacts within and across ecosystems....

  17. Analysis and design of software ecosystem architectures – Towards the 4S telemedicine ecosystem

    DEFF Research Database (Denmark)

    Christensen, Henrik Bærbak; Hansen, Klaus Marius; Kyng, Morten

    2014-01-01

    performed a descriptive, revelatory case study of the Danish telemedicine ecosystem and for ii), we experimentally designed, implemented, and evaluated the architecture of 4S. Results We contribute in three areas. First, we define the software ecosystem architecture concept that captures organization......, and application stove-pipes that inhibit the adoption of telemedical solutions. To which extent can a software ecosystem approach to telemedicine alleviate this? Objective In this article, we define the concept of software ecosystem architecture as the structure(s) of a software ecosystem comprising elements...... experience in creating and evolving the 4S telemedicine ecosystem. Conclusion The concept of software ecosystem architecture can be used analytically and constructively in respectively the analysis and design of software ecosystems....

  18. Radioecological studies in marine ecosystems

    International Nuclear Information System (INIS)

    Kellermann, H.J.; Kanisch, G.

    1999-01-01

    The bioconcentration factor shows the ratio between concentration of a substance in water or in fish. It is a calculation quantity, used for assessing the possible concentration in fish in proportion to the known concentration in water. Although the element cesium discussed in this report is primarily ingested via the food chain (biomagnification) and not via direct uptake through the gills, but the bioconcentration factor model is nevertheless applicable, because there is a relation between the element's concentration in water and in food. One has to consider, however, the influence on cesium uptake through the quantity of food and species-dependent accumulation. Experimental results obtained for various ecosystems are reported and illustrate the mechanisms involved. (orig./CB) [de

  19. The Multifaceted Aspects of Ecosystem Integrity

    Directory of Open Access Journals (Sweden)

    Giulio A. De Leo

    1997-06-01

    Full Text Available The need to reduce human impacts on ecosystems creates pressure for adequate response, but the rush to solutions fosters the oversimplification of such notions as sustainable development and ecosystem health. Hence, it favors the tendency to ignore the complexity of natural systems. In this paper, after a brief analysis of the use and abuse of the notion of ecosystem health, we address the problem of a sound definition of ecosystem integrity, critically review the different methodological and conceptual approaches to the management of natural resources, and sketch the practical implications stemming from their implementation. We show thatthere are merits and limitations in different definitions of ecosystem integrity, for each acknowledges different aspects of ecosystem structure and functioning and reflects the subjective perspectives of humans on the value, importance, and role of biological diversity. This evaluation is based on a brief sketch of the links among biodiversity, ecosystem functioning and resilience, and a description of the problems that arise in distinguishing between natural and anthropogenic disturbance. We also emphasize the difficulty of assessing the economic value of species and habitats and the need to use adaptive management policies to deal with uncertainty and ecosystem complexity. In conclusion, while acknowledging that environmental legislation requires objective statements on ecosystem status and trends, we stress that the notion of ecological integrity is so complex that its measure cannot be expressed through a single indicator, but rather requires a set of indicators at different spatial, temporal, and hierarchical levels of ecosystem organization. Ecosystem integrity is not an absolute, monolithic concept. The existence of different sets of values regarding biological diversity and environmental risks must be explicitly accounted for and incorporated in the decision process, rather than ignored or averaged out.

  20. Temporal scales, ecosystem dynamics, stakeholders and the valuation of ecosystems services

    NARCIS (Netherlands)

    Hein, Lars; Koppen, van C.S.A.K.; Ierland, van Ekko C.; Leidekker, Jakob

    2016-01-01

    Temporal dimensions are highly relevant to the analysis of ecosystem services and their economic value. In this paper, we provide a framework that can be used for analyzing temporal dimensions of ecosystem services, we present a case study including an analysis of the supply of three ecosystem

  1. Lessons learned for spatial modelling of ecosystem services in support of ecosystem accounting

    NARCIS (Netherlands)

    Schroter, M.; Remme, R.P.; Sumarga, E.; Barton, D.N.; Hein, L.G.

    2015-01-01

    Assessment of ecosystem services through spatial modelling plays a key role in ecosystem accounting. Spatial models for ecosystem services try to capture spatial heterogeneity with high accuracy. This endeavour, however, faces several practical constraints. In this article we analyse the trade-offs

  2. Incorporating historical ecosystem diversity into conservation planning efforts in grass and shrub ecosystems

    Science.gov (United States)

    Amy C. Ganguli; Johathan B. Haufler; Carolyn A. Mehl; Jimmie D. Chew

    2011-01-01

    Understanding historical ecosystem diversity and wildlife habitat quality can provide a useful reference for managing and restoring rangeland ecosystems. We characterized historical ecosystem diversity using available empirical data, expert opinion, and the spatially explicit vegetation dynamics model SIMPPLLE (SIMulating Vegetative Patterns and Processes at Landscape...

  3. La crisi del diritto del lavoro

    Directory of Open Access Journals (Sweden)

    Alessandro Garilli

    2012-01-01

    Full Text Available Riassunto - L’Autore ripercorre in chiave critica l’evoluzione delle politiche legislative in materia di lavoro, alla luce dell’attuale fase di crisi economico finanziaria. Nell’esaminare i principali interventi normativi attuati da inizio secolo, l’Autore mette in evidenza le scelte di metodo e gli elementi di continuità che accomunano i vari provvedimenti, individuandoli nell’affannosa ricerca del punto di equilibrio tra flessibilità e garantismo. La riflessione si chiude con alcuni interrogativi sulle ultime linee di riforma del mercato del lavoro e con l’auspicio che, anche al cospetto delle imprescindibili ragioni dell’economia, il diritto del lavoro possa continuare a svolgere il proprio tradizionale ruolo di disciplina di tutela della persona.   Abstract - The author analyzes, with a critically oriented approach, the development of the employment law, in the light of the current economic and financial crisis. In examining the main regulatory measures implemented since the beginning of the century, the author highlights the methodological choices and the elements of continuity that unite the various measures, focusing them in a hard research of a point of balance between flexibility and security. The discussion concludes with some questions about the last lines of the reform of the labor market and with the hope that, even in the face of compelling reasons of economy, labor law can continue to play its traditional role of governing the protection of person.

  4. OBJETIVO DEL DESARROLLO DEL MILENIO 7

    Directory of Open Access Journals (Sweden)

    Margarita M. Pérez O.

    2013-10-01

    Full Text Available Los Objetivos de Desarrollo del Milenio, también conocidos como los Objetivos del Milenio, constituyeron las metas finales que aprobaron los dirigentes mundiales, 189 jefes de estado y de gobierno en la Cumbre del Milenio de las Naciones Unidas celebrada en Nueva York en el año 2000, en la cual los Estados miembros de la organización reafirmaron su compromiso de luchar por un mundo en el que el desarrollo sostenible y la eliminación de la pobreza tuvieran máxima prioridad1 . En la cumbre se definió la Declaración del Milenio, la cual detalla los objetivos, principios, valores, metas y acciones para erradicar la pobreza Mundial hacia el año 2015, todos ellos ratificados con alto interés y acción estratégica de carácter global, como marco para la medición de los progresos en materia de desarrollo.

  5. Elementos del sistema electoral del Congreso Mexicano

    Directory of Open Access Journals (Sweden)

    Aldo Medina García

    2013-08-01

    Full Text Available El presente artículo es un estudio de los componentes del sistema electoral, diseñado por el legislador mexicano para integrar al parlamento federal. Estudio desarrollado a sabiendas de la importancia que reviste el sistema electoral como un medio que permite a los ciudadanos convertir su voto expresado en las urnas en escaños a favor de determinado candidato o partido. En dicho análisis tomamos en cuenta la evolución constitucional del sistema electoral mexicano, la participación de las fuerzas minoritarias en la integración del Senado y de la Cámara de Diputados, la división que se hace del territorio en circunscripciones electorales, la barrera electoral que se fija a los partidos políticos para acceder a la representación en el Parlamento, la fórmula de asignación que se aplica a la votación obtenida, para finalmente concluir que el sistema electoral mexicano es esencialmente mayoritario aun cuando se vista de proporcional.

  6. Environmental contamination in Antarctic ecosystems.

    Science.gov (United States)

    Bargagli, R

    2008-08-01

    Although the remote continent of Antarctica is perceived as the symbol of the last great wilderness, the human presence in the Southern Ocean and the continent began in the early 1900s for hunting, fishing and exploration, and many invasive plant and animal species have been deliberately introduced in several sub-Antarctic islands. Over the last 50 years, the development of research and tourism have locally affected terrestrial and marine coastal ecosystems through fuel combustion (for transportation and energy production), accidental oil spills, waste incineration and sewage. Although natural "barriers" such as oceanic and atmospheric circulation protect Antarctica from lower latitude water and air masses, available data on concentrations of metals, pesticides and other persistent pollutants in air, snow, mosses, lichens and marine organisms show that most persistent contaminants in the Antarctic environment are transported from other continents in the Southern Hemisphere. At present, levels of most contaminants in Antarctic organisms are lower than those in related species from other remote regions, except for the natural accumulation of Cd and Hg in several marine organisms and especially in albatrosses and petrels. The concentrations of organic pollutants in the eggs of an opportunistic top predator such as the south polar skua are close to those that may cause adverse health effects. Population growth and industrial development in several countries of the Southern Hemisphere are changing the global pattern of persistent anthropogenic contaminants and new classes of chemicals have already been detected in the Antarctic environment. Although the Protocol on Environmental Protection to the Antarctic Treaty provides strict guidelines for the protection of the Antarctic environment and establishes obligations for all human activity in the continent and the Southern Ocean, global warming, population growth and industrial development in countries of the Southern

  7. Ethnobotany of the Sierra Nevada del Cocuy-Güicán

    NARCIS (Netherlands)

    Rodríguez, Mireia Alcántara; Angueyra, Andrea; Cleef, Antoine M.; Andel, van Tinde

    2018-01-01

    Background: The Sierra Nevada del Cocuy-Güicán in the Colombian Andes is protected as a National Natural Park since 1977 because of its fragile páramo ecosystems, extraordinary biodiversity, high plant endemism, and function as water reservoir. The vegetation on this mountain is threatened by

  8. Los signos del extravío: retos del pensamiento en colombia

    OpenAIRE

    Restrepo R., Luis Carlos

    2010-01-01

    Catarsis para expurgar el bien: en medio de un desborde sangriento que arrasa, de un solo tajo, con la vida de letrados y analfabetos, de niños, dirigentes o simples empleados, no podemos soslayar la presencia de complejas redes de actitudes y símbolos que atizan el fuego de la intolerancia, volviéndonos ineptos para dialogar con la diferencia. Estos símbolos nos poseen, hablando a través de nuestros cuerpos mientras se alimentan de una milenaria tradición cultural, dificultando cualquier ref...

  9. Designing, developing, and implementing software ecosystems

    DEFF Research Database (Denmark)

    Manikas, Konstantinos; Hämäläinen, Mervi; Tyrväinen, Pasi

    2017-01-01

    identifies that ecosystems typically emerge from either a company deciding to allow development on their product platform or from a successful open source project. In our study we add to this knowledge by demonstrating, through two case studies, that ecosystems can emerge from more than a technological...

  10. Conservation of ecosystems : theory and practice

    CSIR Research Space (South Africa)

    Siegfried, WR

    1982-09-01

    Full Text Available stream_source_info Conservation of Ecosystems Theory and Practice.pdf.txt stream_content_type text/plain stream_size 102 Content-Encoding ISO-8859-1 stream_name Conservation of Ecosystems Theory and Practice.pdf.txt Content...-Type text/plain; charset=ISO-8859-1 ...

  11. Risk and markets for ecosystem services.

    Science.gov (United States)

    Bendor, Todd K; Riggsbee, J Adam; Doyle, Martin

    2011-12-15

    Market-based environmental regulations (e.g., cap and trade, "payments for ecosystem services") are increasingly common. However, few detailed studies of operating ecosystem markets have lent understanding to how such policies affect incentive structures for improving environmental quality. The largest U.S. market stems from the Clean Water Act provisions requiring ecosystem restoration to offset aquatic ecosystems damaged during development. We describe and test how variations in the rules governing this ecosystem market shift risk between regulators and entrepreneurs to promote ecological restoration. We analyze extensive national scale data to assess how two critical aspects of market structure - (a) the geographic scale of markets and (b) policies dictating the release of credits - affect the willingness of entrepreneurs to enter specific markets and produce credits. We find no discernible relationship between policies attempting to ease market entry and either the number of individual producers or total credits produced. Rather, market entry is primarily related to regional geography (the prevalence of aquatic ecosystems) and regional economic growth. Any improvements to policies governing ecosystem markets require explicit evaluation of the interplay between policy and risk elements affecting both regulators and entrepreneurial credit providers. Our findings extend to emerging, regulated ecosystem markets, including proposed carbon offset mechanisms, biodiversity banking, and water quality trading programs.

  12. Invertebrates, ecosystem services and climate change.

    Science.gov (United States)

    Prather, Chelse M; Pelini, Shannon L; Laws, Angela; Rivest, Emily; Woltz, Megan; Bloch, Christopher P; Del Toro, Israel; Ho, Chuan-Kai; Kominoski, John; Newbold, T A Scott; Parsons, Sheena; Joern, A

    2013-05-01

    The sustainability of ecosystem services depends on a firm understanding of both how organisms provide these services to humans and how these organisms will be altered with a changing climate. Unquestionably a dominant feature of most ecosystems, invertebrates affect many ecosystem services and are also highly responsive to climate change. However, there is still a basic lack of understanding of the direct and indirect paths by which invertebrates influence ecosystem services, as well as how climate change will affect those ecosystem services by altering invertebrate populations. This indicates a lack of communication and collaboration among scientists researching ecosystem services and climate change effects on invertebrates, and land managers and researchers from other disciplines, which becomes obvious when systematically reviewing the literature relevant to invertebrates, ecosystem services, and climate change. To address this issue, we review how invertebrates respond to climate change. We then review how invertebrates both positively and negatively influence ecosystem services. Lastly, we provide some critical future directions for research needs, and suggest ways in which managers, scientists and other researchers may collaborate to tackle the complex issue of sustaining invertebrate-mediated services under a changing climate. © 2012 The Authors. Biological Reviews © 2012 Cambridge Philosophical Society.

  13. Early detection of ecosystem regime shifts

    DEFF Research Database (Denmark)

    Lindegren, Martin; Dakos, Vasilis; Groeger, Joachim P.

    2012-01-01

    methods may have limited utility in ecosystem-based management as they show no or weak potential for early-warning. We therefore propose a multiple method approach for early detection of ecosystem regime shifts in monitoring data that may be useful in informing timely management actions in the face...

  14. AN ECOSYSTEM FRAMEWORK FOR FISHERIES MANAGEMENT ...

    African Journals Online (AJOL)

    Second, using a dynamic simulation approach, indicators quantifying interaction strength and functional impacts can provide information on the size of impacts on ecosystem components when a group is overfished. Third, dynamic simulations can suggest some possible short- and long-term ecosystem effects of altered ...

  15. Assessing Ecosystem Model Performance in Semiarid Systems

    Science.gov (United States)

    Thomas, A.; Dietze, M.; Scott, R. L.; Biederman, J. A.

    2017-12-01

    In ecosystem process modelling, comparing outputs to benchmark datasets observed in the field is an important way to validate models, allowing the modelling community to track model performance over time and compare models at specific sites. Multi-model comparison projects as well as models themselves have largely been focused on temperate forests and similar biomes. Semiarid regions, on the other hand, are underrepresented in land surface and ecosystem modelling efforts, and yet will be disproportionately impacted by disturbances such as climate change due to their sensitivity to changes in the water balance. Benchmarking models at semiarid sites is an important step in assessing and improving models' suitability for predicting the impact of disturbance on semiarid ecosystems. In this study, several ecosystem models were compared at a semiarid grassland in southwestern Arizona using PEcAn, or the Predictive Ecosystem Analyzer, an open-source eco-informatics toolbox ideal for creating the repeatable model workflows necessary for benchmarking. Models included SIPNET, DALEC, JULES, ED2, GDAY, LPJ-GUESS, MAESPA, CLM, CABLE, and FATES. Comparison between model output and benchmarks such as net ecosystem exchange (NEE) tended to produce high root mean square error and low correlation coefficients, reflecting poor simulation of seasonality and the tendency for models to create much higher carbon sources than observed. These results indicate that ecosystem models do not currently adequately represent semiarid ecosystem processes.

  16. ECOSYSTEM APPROACH TO FISHERIES MANAGEMENT IN THE ...

    African Journals Online (AJOL)

    To date, fisheries management has been based largely on a single-stock approach, but Namibia is committed to implement, in addition, an ecosystem approach to fisheries (EAF) management. The work leading to this implementation is described, in particular an ecosystem modelling study undertaken to summarize the ...

  17. Forests planted for ecosystem restoration or conservation.

    Science.gov (United States)

    Constance A. Harrington

    1999-01-01

    Although the phrase, "planting for ecosystem restoration," is of recent origin, many of the earliest large-scale tree plantings were made for what we now refer to as "'restoration" or "conservation" goals. Forest restoration activities may be needed when ecosystems are disturbed by either natural or anthropogenic forces. Disturbances...

  18. Innovative financing mechanisms for sustainable ecosystem management

    NARCIS (Netherlands)

    Meijerink, G.W.; Diemont, W.H.; Groot, de R.S.; Schrijver, R.A.M.; Verhagen, A.

    2008-01-01

    The increasing human influence on ecosystems and the ensuing unsustainable exploitation and degradation has led in many places to depletion and loss of function of these ecosystems. These problems cannot be solved by (innovative) financing mechanisms, as the causes do not lie in a lack of financing

  19. Urban ecosystems: What would Tansley do?

    Science.gov (United States)

    Steward T. A. Pickett; J. M. Grove

    2009-01-01

    The ecosystem concept was introduced in ecology originally to solve problems associated with theories of succession and ecological communities. It has evolved to become one of ecology's fundamental ideas, and has proven to be applicable to a wide variety of research questions and applications. However, there is controversy about whether or how well the ecosystem...

  20. Ecosystem functioning is enveloped by hydrometeorological variability.

    Science.gov (United States)

    Pappas, Christoforos; Mahecha, Miguel D; Frank, David C; Babst, Flurin; Koutsoyiannis, Demetris

    2017-09-01

    Terrestrial ecosystem processes, and the associated vegetation carbon dynamics, respond differently to hydrometeorological variability across timescales, and so does our scientific understanding of the underlying mechanisms. Long-term variability of the terrestrial carbon cycle is not yet well constrained and the resulting climate-biosphere feedbacks are highly uncertain. Here we present a comprehensive overview of hydrometeorological and ecosystem variability from hourly to decadal timescales integrating multiple in situ and remote-sensing datasets characterizing extra-tropical forest sites. We find that ecosystem variability at all sites is confined within a hydrometeorological envelope across sites and timescales. Furthermore, ecosystem variability demonstrates long-term persistence, highlighting ecological memory and slow ecosystem recovery rates after disturbances. However, simulation results with state-of-the-art process-based models do not reflect this long-term persistent behaviour in ecosystem functioning. Accordingly, we develop a cross-time-scale stochastic framework that captures hydrometeorological and ecosystem variability. Our analysis offers a perspective for terrestrial ecosystem modelling and paves the way for new model-data integration opportunities in Earth system sciences.

  1. Lichens in Puerto Rico: an ecosystem approach

    Science.gov (United States)

    Joel A. Mercado-Díaz; William A. Gould; Grizelle Gonzalez; Robert. Lücking

    2015-01-01

    This work presents basic information on tropical lichenology. It also describes general aspects about the ecology and biodiversity of these organisms in eight forest ecosystems present along an elevational gradient in northeastern Puerto Rico. These ecosystems consist of elfin woodlands, palo colorado, sierra palm, tabonuco, lowland moist, dry, mangrove, and...

  2. Economic values, ethics, and ecosystem health

    Science.gov (United States)

    Thomas P. Holmes; Randall A. Kramer

    1995-01-01

    Economic valuations of changes in ecosystem health can provide quantitative information for social decisions. However, willingness to pay for ecosystem health may be motivated by an environmental ethic regarding the right thing to do. Counterpreferential choices based on an environmental ethic are inconsistent with the normative basis of welfare economics. In this...

  3. Entrepreneurship and strategic thinking in business ecosystems

    NARCIS (Netherlands)

    Zahra, Shaker; Nambisan, S.

    2012-01-01

    Success in business ecosystems that include well-established companies and new ventures requires collaboration and competition, a task that demands strategic thinking to leverage a firm's resources and capabilities. Strategic thinking and the entrepreneurial activities in an ecosystem influence one

  4. Reactive nitrogen impacts on ecosystem services

    Science.gov (United States)

    The Ecosystem Services Research Program (ESRP) is a new, multi-year research initiative under development by the Environmental Protection Agency (EPA). As one of its components, ESRP has chosen to focus on reactive Nitrogen (Nr) for stressor-specific ecosystem research through a...

  5. Ecosystem services: Just another catch phrase?

    Science.gov (United States)

    Emily Weidner

    2011-01-01

    The "ecosystem services" concept has emerged as a popular area of discussion among policy makers and conservation advocates. Ecosystem services are the benefits people derive from nature and include the provision of water, food, wood, and fiber; regulation of climate, flood, drought, and disease; maintenance of biodiversity; and recreational, aesthetic,...

  6. Ecosystem carbon stocks of micronesian mangrove forests

    Science.gov (United States)

    J. Boone Kauffman; Chris Heider; Thomas G. Cole; Kathleen A. Dwire; Daniel C. Donato

    2011-01-01

    Among the least studied ecosystem services of mangroves is their value as global carbon (C) stocks. This is significant as mangroves are subject to rapid rates of deforestation and therefore could be significant sources of atmospheric emissions. Mangroves could be key ecosystems in strategies addressing the mitigation of climate change though reduced deforestation. We...

  7. Carbon sequestration and natural longleaf pine ecosystem

    Science.gov (United States)

    Ram Thapa; Dean Gjerstad; John Kush; Bruce Zutter

    2010-01-01

    The Southeastern United States was once dominated by a longleaf pine ecosystem which ranged from Virginia to Texas and covered approximately 22 to 36 million ha. The unique fire tolerant species provided the necessary habitat for numerous plant and animal species. Different seasons of prescribed fire have various results on the ecosystem and the carbon which is stored...

  8. Ecosystem services in the Great Lakes

    Science.gov (United States)

    A comprehensive inventory of ecosystem services across the entire Great Lakes basin is currently lacking and is needed to make informed management decisions. A greater appreciation and understanding of ecosystem services, including both use and non-use services, may have avoided ...

  9. Ecosystem Services in Environmental Science Literacy

    Science.gov (United States)

    Ruppert, John Robert

    2015-01-01

    Human beings depend on a set of benefits that emerge from functioning ecosystems, termed Ecosystem Services (ES), and make decisions in everyday life that affect these ES. Recent advancements in science have led to an increasingly sophisticated understanding of ES and how they can be used to inform environmental decision-making. Following suit, US…

  10. Payment for Ecosystem Services | Benjamin | Potchefstroom ...

    African Journals Online (AJOL)

    This address focuses on the legislative design for payment or ecosystem services (PES) since most countries do not have specific legislation that addresses the subject. Brazil is in the process of drafting national legislation on ecosystem services and there are several important issues that can be learnt from this experience.

  11. Scientists' Needs in Software Ecosystem Modeling

    NARCIS (Netherlands)

    Jansen, Slinger; Handoyo, Eko; Alves, C.

    2015-01-01

    Currently the landscape of software ecosystem modelling methods and languages is like Babel after the fall of the tower: there are many methods and languages available and interchanging data between researchers and organizations that actively govern their ecosystem, is practically impossible. The

  12. Ecosystem restoration: a systems approach to exotic plant control

    Science.gov (United States)

    Karl D. Smith

    1998-01-01

    Ecosystem restoration is a systems approach because it relates to all of the thousands of interrelated and interacting systems within the ecosystem. Ecosystem restoration also changes your role in the forest from observer to participant. Some of the goals of ecosystem restoration are to improve the health, vigor, and diversity of the ecosystem--and these goals can and...

  13. Vulnerabilidad y adaptabilidad al ascenso del nivel del mar en humedales y poblaciones costeras: el manglar del humedal nacional Térraba-Sierpe de Osa, Costa Rica

    Directory of Open Access Journals (Sweden)

    Valverde Sánchez, Ricardo

    2016-06-01

    Full Text Available El pronosticado ascenso en el nivel medio del mar convierte a los litorales costarricenses en espacios vulnerables. Las características geomorfológicas predominantes de la costa pacífica costarricense, consistente de playas en el frente de llanuras aluviales y marismas, convierte a esta región en una zona susceptible a la expansión marina como resultado del ascenso del nivel del mar. Es bajo este contexto que la presente investigación busca analizar la vulnerabilidad de poblaciones y ecosistemas costeros, en una unidad geográfica específica del litoral del pacífico sur costarricense: el manglar del Humedal Nacional Térraba-Sierpe (HNTS, así como dotar a estos entornos y comunidades humanas dependientes de los mismos de herramientas que ayuden a reducir su vulnerabilidad. El análisis socioespacial evidencia espacios costeros donde coexisten poblaciones humanas y bosques de mangle vulnerables a la trasgresión y expansión marinas asociadas con el ascenso del nivel del mar. La percepción de la población consultada y las observaciones de campo, constatan que el crecimiento del nivel del mar constituye un factor que está generando modificaciones en la dinámica costera, con las consecuentes repercusiones sobre el manglar y sus poblaciones. The geomorphologic traits of Costa Rica's Pacific coastline, consisting of beachfronts on coastal plains and sea marshes, turn it into a vulnerable spatial unit to the predicted rise in the average sea level with its subsequent sea water expansion. Under this scenario, the current research focuses on analyzing the vulnerability of coastal ecosystems and their human settlements, in a specific geographical unit of Costa Rica's south Pacific coast: The mangrove of the Terraba-Sierpe National Wetland, as well as on providing these surroundings and their depending communities with some tools oriented to diminish their vulnerability. The socio-spatial analysis shows coastal areas with human populations

  14. Castillo del Real. Olocau

    OpenAIRE

    AUÑÓN VALLEJO, JONATAN

    2012-01-01

    El objetivo que se quiere alcanzar con este proyecto es el de realizar un estudio lo más cercano posible del Catillo del Real, de manera que se pueda conocer su origen, su evolución a lo largo de la historia, así como las diferentes técnicas y sistemas constructivos utilizados en su construcción. Auñón Vallejo, J. (2011). Castillo del Real. Olocau. http://hdl.handle.net/10251/14244. Archivo delegado

  15. La Representabilidad del Genocidio

    OpenAIRE

    Cardona González, Lorena

    2012-01-01

    El presente artículo intenta hacer una aproximación histórica y analítica al fenómeno del Genocidio, sus implicaciones sociales y culturales que dieron como resultado la reformulación analítica y conceptual de hechos que hasta entonces superaban el conocimiento y la moral humana. De este modo, se hace un trayecto histórico de la paulatina aparición del asesinato masivo como practica de Estado, enmarcado en las experiencias del genocidio armenio y el alemán. A su vez, se hace una mirada sobre ...

  16. Significado presente del CSIC

    OpenAIRE

    Garrido Gallardo, Miguel Angel

    2000-01-01

    Not available

    Este artículo, elaborado en 1999, ofrece una panorámica de la realidad del Consejo Superior de Investigaciones Científicas en la actualidad. Repasa su organización, su volumen de publicaciones, sus indicadores de productividad, su capacidad de obtener recursos y, en suma, su lugar en el conjunto del sistema español de Ciencia y Tecnología, considerado en sí mismo y en relación con la Universidad. Como conclusión del repaso de datos, se afirma que, aunque la fó...

  17. Tratamiento del pie equino

    OpenAIRE

    Robles, Fernanda

    2012-01-01

    El pie equino varo es una patología frecuente en los pacientes con Encefalopatía crónica no evolutiva (ECNE).Se observó que existe una mayor frecuencia en el sexo masculino. Se realizó un estudio descriptivo, comparativo y secundario, durante el periodo de septiembre del 2006 a septiembre del 2011, con un total de 125 pacientes con Ecne, de los cuales se encontraron 101 con pie equino varo congénito. Objetivo: observar los resultados obtenidos en la rehabilitación del pie equino, en niños de ...

  18. Del Pasadismo al Futurismo

    OpenAIRE

    Agudo-Martínez, M. J.

    2003-01-01

    Uno de los habituales prejuicios a la hora de abordar el análisis del movimiento futurista, al igual que sucede con el constructivismo, es la consideración del contexto político en el que se desarrollaron ambas vanguardias. Sin embargo, y dejando a un lado un enfoque del arte con finalidad política de signo diverso, habría que insistir en el hecho de que posiblemente sean tanto el futurismo italiano como el constructivismo ruso, los movimientos que con mayor entusiasmo se manifestaron, en un ...

  19. Radionuclide transport processes in terrestrial ecosystems

    International Nuclear Information System (INIS)

    Whicker, F.W.

    1983-01-01

    Some major principles and the status of knowledge concerning the transport of radionuclides through terrestrial ecosystems are reviewed. Fundamental processes which control the flow of radionuclides between ecosystem components such as air, soil, plants, and animals are described, with emphasis on deposition, resuspension, plant uptake, ingestion, and assimilation. Properties of radionuclides, organisms, and ecosystems are examined in relation to their influence on the accumulation of radioactive materials by plants and animals. The effects of the physicochemical nature of the radionuclide; morphology, physiology, and behavior of the organism; and soil, nutrient, and trophic characteristics of the ecosystem are highlighted. Observations in natural ecosystems on radionuclides such as 137 Cs, 90 Sr, 131 I, 3 H, and 239 Pu are used to illustrate current concepts. An assessment of the degree to which the processes controlling radionuclide behavior are understood and of our ability to simulate and predict such behavior with computerized models is offered. Finally, brief comments are made on research needs

  20. Reframing landscape fragmentation's effects on ecosystem services.

    Science.gov (United States)

    Mitchell, Matthew G E; Suarez-Castro, Andrés F; Martinez-Harms, Maria; Maron, Martine; McAlpine, Clive; Gaston, Kevin J; Johansen, Kasper; Rhodes, Jonathan R

    2015-04-01

    Landscape structure and fragmentation have important effects on ecosystem services, with a common assumption being that fragmentation reduces service provision. This is based on fragmentation's expected effects on ecosystem service supply, but ignores how fragmentation influences the flow of services to people. Here we develop a new conceptual framework that explicitly considers the links between landscape fragmentation, the supply of services, and the flow of services to people. We argue that fragmentation's effects on ecosystem service flow can be positive or negative, and use our framework to construct testable hypotheses about the effects of fragmentation on final ecosystem service provision. Empirical efforts to apply and test this framework are critical to improving landscape management for multiple ecosystem services. Copyright © 2015 Elsevier Ltd. All rights reserved.

  1. An indicator for ecosystem externalities in fishing

    DEFF Research Database (Denmark)

    Ravn-Jonsen, Lars; Andersen, Ken Haste; Vestergaard, Niels

    2016-01-01

    Ecosystem externalities arise when one use of an ecosystem affects its other uses through the production functions of the ecosystem. We use simulations with a size-spectrum ecosystem model to investigate the ecosystem externality created by fishing of multiple species. The model is based upon...... general ecological principles and is calibrated to the North Sea. Two fleets are considered: a "forage fish" fleet targeting species that mature at small sizes and a "large fish" fleet targeting large piscivorous species. Based on the marginal analysis of the present value of the rent, we develop...... a benefit indicator that explicitly divides the consequences of fishing into internal and external benefits. This analysis demonstrates that the forage fish fleet has a notable economic impact on the large fish fleet, but the reverse is not true. The impact can be either negative or positive, which entails...

  2. Sustaining ecosystem services in cultural landscapes

    DEFF Research Database (Denmark)

    Plieninger, Tobias; van der Horst, Dan; Schleyer, Christian

    2014-01-01

    Classical conservation approaches focus on the man-made degradation of ecosystems and tend to neglect the socialecological values that human land uses have imprinted on many environments. Throughout the world, ingenious land-use practices have generated unique cultural landscapes...... research and management. With this paper, we introduce a special feature that aims to enhance the theoretical, empirical and practical knowledge of how to safeguard the resilience of ecosystem services in cultural landscapes. It concludes (1) that the usefulness of the ecosystem services approach...... to the analysis and management of cultural landscapes should be reviewed more critically; (2) that conventional ecosystem services assessment needs to be complemented by socio-cultural valuation; (3) that cultural landscapes are inherently changing, so that a dynamic view on ecosystem services and a focus...

  3. Towards a typification of software ecosystems

    DEFF Research Database (Denmark)

    Knodel, Jens; Manikas, Konstantinos

    2015-01-01

    Classical software engineering has been traditionally dominated by stand-alone development organizations and collaborations be- tween contractors, integrators and suppliers. The notion of software ecosystems has been established as a new kind of software engineer- ing paradigm in the last decade....... In its essence it proposes participative engineering across independent development organizations. This short paper reviews the current state-of-the-art and presents a typification of successful software ecosystems. We further discuss key characteristic of the ecosystem types and present a set of example...... cases. The characterization reviews and consolidates existing research and discusses variations within the key building block of a software ecosystem. It further enables sharpening the borders of what an ecosystem is (and what not) and how the individual types can be differentiated. Thus, this paper...

  4. Intertemporal Choice of Marine Ecosystem Exploitation

    DEFF Research Database (Denmark)

    Ravn-Jonsen, Lars

    Management, however, requires models that can link the ecosystem level to the operation level, so this paper examines an ecosystem production model and shows that it is suitable for applying ground rent theory. This model is the simplest possible that incorporates the principles of size as the main......, it is probably detrimental from an economic point of view. The marine ecosystem therefore requires an ecosystem management for economic reasons; in this context, models like the one presented here can serve as useful planning tools....... determinant of the predator--prey interaction, the inclusion of mass balance in the predator--prey allocation, and mortality and somatic growth as consequences of the predator--prey allocation. The model needs to be parameterized for the specific ecosystem and the price and cost functions must be established...

  5. Ecosystem Under Construction: An Action Research Study on Entrepreneurship in a Business Ecosystem

    Directory of Open Access Journals (Sweden)

    Leni Kuivaniemi

    2012-06-01

    Full Text Available In recent years, we have seen increasing interest in new service concepts that take advantage of the capabilities of business ecosystems instead of single companies. In this article, we describe how a business ecosystem begins to develop around a service business idea proposed by an entrepreneur. We aim to recognize the different domains of players that are or should be involved in the ecosystem while it is under construction. The article concludes with an ecosystem model consisting of six sub-ecosystems having different change drivers and clockspeeds.

  6. Bosques andinos del sur de Ecuador, clasificación, regeneración y uso

    Directory of Open Access Journals (Sweden)

    Rainer W. Bussmann

    2013-05-01

    Full Text Available Existen muy pocos inventarios y descripciones sintaxonómicas de la vegetación de bosques montanos tropicales. Este trabajo presenta datos sobre los bosques del sur de Ecuador localizados en la Reserva Biológica San Francisco, límite norte del Parque Nacional Podocarpus. Se propone la siguiente clasificación junto con notas sobre los factores edáficos que contribuyen a su establecimiento. El «Bosque Montano Bajo» (1800-2150 m, formando el orden Alzateetalia verticillatae, muestra 2-3 estratos arbóreos muy diversos, con árboles de 20-35 m de altura, y es una clímax mosaico típico. Creciendo sobre Terric Haplosaprists y Aquic Dystrupepts, originado del material de derrumbes viejos, este tipo de bosque se extiende hasta los 2300 m sobre el nivel del mar en quebradas protegidas de viento. A altitudes de 2100-2650 m (menos de 2750 m la estructura del bosque y la composición florística cambia totalmente. Esta vegetación, el «Bosque Montano Alto» forma el orden de Purdiaeaetalia nutantis y crece sobre Histic Petraquepts. Representando una vegetación monotípica con un solo estrato arbóreo de 5-10 m (–15 m de altura, completamente dominado por Purdiaea nutans (Cyrillaceae. El bosque ubicado a mayor altitud en el área, densamente enlazado con el páramo es el «Bosque Nublado Subalpino». Descritos como Clusio ellipticae-Weinmannietum cochensis aparecen más como una vegetación arbustiva casi impenetrable, y crecen sobre Humaquic Epiaquents. El límite del bosque es causado principalmente por los vientos fuertes de la región. Derrumbes e incendios naturales representan el «motor» de regeneración de los bosques. Se encontró carbón en la base de los niveles A de muchos perfiles de suelo. El análisis 14C precisó una edad de 710-980 ±50 años antes del presente. Esto indica que fuegos en la vegetación han contribuido a la dinámica de esta vegetación en el pasado y no es un fenómeno reciente. El diámetro basal de los

  7. Neighbourhood-scale urban forest ecosystem classification.

    Science.gov (United States)

    Steenberg, James W N; Millward, Andrew A; Duinker, Peter N; Nowak, David J; Robinson, Pamela J

    2015-11-01

    Urban forests are now recognized as essential components of sustainable cities, but there remains uncertainty concerning how to stratify and classify urban landscapes into units of ecological significance at spatial scales appropriate for management. Ecosystem classification is an approach that entails quantifying the social and ecological processes that shape ecosystem conditions into logical and relatively homogeneous management units, making the potential for ecosystem-based decision support available to urban planners. The purpose of this study is to develop and propose a framework for urban forest ecosystem classification (UFEC). The multifactor framework integrates 12 ecosystem components that characterize the biophysical landscape, built environment, and human population. This framework is then applied at the neighbourhood scale in Toronto, Canada, using hierarchical cluster analysis. The analysis used 27 spatially-explicit variables to quantify the ecosystem components in Toronto. Twelve ecosystem classes were identified in this UFEC application. Across the ecosystem classes, tree canopy cover was positively related to economic wealth, especially income. However, education levels and homeownership were occasionally inconsistent with the expected positive relationship with canopy cover. Open green space and stocking had variable relationships with economic wealth and were more closely related to population density, building intensity, and land use. The UFEC can provide ecosystem-based information for greening initiatives, tree planting, and the maintenance of the existing canopy. Moreover, its use has the potential to inform the prioritization of limited municipal resources according to ecological conditions and to concerns of social equity in the access to nature and distribution of ecosystem service supply. Copyright © 2015 Elsevier Ltd. All rights reserved.

  8. Using landscape limnology to classify freshwater ecosystems for multi-ecosystem management and conservation

    Science.gov (United States)

    Soranno, Patricia A.; Cheruvelil, Kendra Spence; Webster, Katherine E.; Bremigan, Mary T.; Wagner, Tyler; Stow, Craig A.

    2010-01-01

    Governmental entities are responsible for managing and conserving large numbers of lake, river, and wetland ecosystems that can be addressed only rarely on a case-by-case basis. We present a system for predictive classification modeling, grounded in the theoretical foundation of landscape limnology, that creates a tractable number of ecosystem classes to which management actions may be tailored. We demonstrate our system by applying two types of predictive classification modeling approaches to develop nutrient criteria for eutrophication management in 1998 north temperate lakes. Our predictive classification system promotes the effective management of multiple ecosystems across broad geographic scales by explicitly connecting management and conservation goals to the classification modeling approach, considering multiple spatial scales as drivers of ecosystem dynamics, and acknowledging the hierarchical structure of freshwater ecosystems. Such a system is critical for adaptive management of complex mosaics of freshwater ecosystems and for balancing competing needs for ecosystem services in a changing world.

  9. Capability-Driven Design of Business Service Ecosystem to Support Risk Governance in Regulatory Ecosystems

    Directory of Open Access Journals (Sweden)

    Christophe Feltus

    2017-04-01

    Full Text Available Risk-based regulation and risk governance gain momentum in most sectorial ecosystems, should they be the finance, the healthcare or the telecommunications ecosystems. Although there is a profusion of tools to address this issue at the corporate level, worth is to note that no solution fulfils this function at the ecosystem level yet. Therefore, in this article, the Business Service Ecosystem (BSE metamodel is semantically extended, considering the Capability as a Service (CaaS theory, in order to raise the enterprise risk management from the enterprise level up to the ecosystem level. This extension allows defining a concrete ecosystem metamodel which is afterwards mapped with an information system risk management model to support risk governance at the ecosystem level. This mapping is illustrated and validated on the basis of an application case for the Luxembourgish financial sector applied to the most important concepts from the BSE: capability, resource, service and goal.

  10. Preferencias del Turista

    Directory of Open Access Journals (Sweden)

    Jose Luis Leiva Olivencia

    2015-01-01

    Full Text Available Actualmente existen aplicaciones orientadas al turismo basadas en realidad aumentada, pero no integran técnicas de recomendación. Este articulo describe RAMCAT (Realidad Aumentada Móvil Contextual Aplicada al Turismo un modelo de guía turística, que recomienda puntos de interés, teniendo en cuenta factores como preferencias personales y atributos contextuales. Se presentan los componentes teóricos de la arquitectura propuesta, así como sus características, destacando la integración de diferentes sistemas de recomendación, que permiten añadir nuevos motores en el futuro. El articulo se centra en describir sus funcionalidades y el modulo correspondiente al sistema de recomendación basado en el perfil del turista. Otra característica importante del sistema propuesto es la retroalimentación del mismo mediante calificaciones del turista y su trazabilidad.

  11. Carta del Editor

    Directory of Open Access Journals (Sweden)

    Luis Eladio Proaño

    2015-01-01

    Full Text Available La millonaria contratación del futbolista David Beckham, un fenómeno del mercado, ha provocado cuestionamientos a los que se busca respuesta. Es tema de análisis el por qué el betseller "Harry Potter" ha causado tanta conmoción en la opinión pública. Respecto al periodista cibernético, se señalan los contornos del presente y atisban las posibilidades del futuro de esta nueva profesión. El tratamiento de los mitos de la prensa, los temores de la Ley mordaza venezolana y la brutalidad de los video juegos e Internet son temas de enorme interés. Se comenta las pocas veces que la prensa reflexiona sobre la comunicación corporal y la anorexia.

  12. Los muertos del Floreanismo

    Directory of Open Access Journals (Sweden)

    Enrique Ayala Mora

    2008-06-01

    Full Text Available El artículo analiza el crimen político durante las primeras décadas de vida de la República del Ecuador. Específicamente centra su estudio en el período dominado por la figura de Juan José Flores, primer presidente del Ecuador. La inestabilidad política, la precariedad de las alianzas entre las élites regionales, la crisis económica generada por las guerras de Independencia, las conspiraciones y la violencia que caracterizaron al período de surgimiento de las repúblicas andinas hicieron del crimen político un “vicio de nacimiento”. El asesinato del general Antonio José de Sucre, la muerte de los miembros de la sociedad El Quiteño Libre, el homicidio de Juan Otamendi, entre otros, hicieron patente esta característica.

  13. Niveles del aprendizaje organizacional

    OpenAIRE

    Garzón Castrillón, Manuel Alfonso

    2005-01-01

    En la propuesta de modelo de aprendizaje organizacional (AO), la segunda variable se denomina niveles del aprendizaje organizacional ; los niveles de aprendizaje que contemplamos para nuestra investigación son: individual, de equipo, organizacional e interorganizacional.

  14. La escritura del Yo

    Directory of Open Access Journals (Sweden)

    Patricio Landaeta Mardones

    2013-11-01

    Full Text Available Si la creación de una imagen fidedigna del mundo fue la condición de la conquista cognitiva y económica de la tierra, las imágenes mediáticas circulan hoy en día a la manera de un montaje que organiza los sujetos como elementos de un territorio. En esta presentación abordaremos el cruce entre estos dos hechos, entre la escritura del mundo y la de los sujetos, a partir de la idea de Fabulación para mostrar otra escritura del mundo y del yo, leyendo textos e imágenes de la Primera buena Corónica y Buen Gobierno de Felipe Guaman Poma de Ayala.

  15. Reseña de Conquistando el fin del mundo. La Misión La Candelaria y la salud de la población Selkman, Tierra del fuego 1895-1931 de Romina Casali. Prohistoria, Rosario, 2014, 260 páginas

    OpenAIRE

    Ramacciotti, Karina Inés

    2016-01-01

    Romina Casali aborda de una manera atenta, a la vez que sofisticada, los cruces entre la enfermedad, los discursos científicos y políticos en la misión salesiana La Candelaria (Río Grande) entre 1895-1931. Este estudio de caso permite reflexionar sobre fenómenos de larga duración y pasibles de ser estudiados en historia de la sociedad Selk’nam, comunidad cazadora-recolectora. La propuesta no queda atrapada en la descripción de lo local sino que de una manera madura aventura hipótesis sobre lo...

  16. Consideraciones alrededor del Libro del Almismo, el Libro del Pensar.

    Directory of Open Access Journals (Sweden)

    MartaLucía Tamayo Fernandez

    1999-12-01

    Full Text Available

    La doctora MarthaLucía Tamayo comparte muchas inquietudes alrededor del Libro del Almismo, el Libro del Pensar; de dónde salió ese nombre; de juntar en medicina y en genética a tres escritores como lo son Jorge Luis Borges, Macedonio Fernández y Julio Cortázar. Su conferencia dice así:

    El término almismo fue ideado por Macedonio Fernández porque defendía mucho el ensimismamiento y el pensamiento hacia el interior, mirar hacia adentro; cada uno somos un “sí mismo” que nos hace diferentes aunque al mismo tiempo podemos ser iguales. Todos tenemos esa parte interior que la medicina debe trabajar y que no puede olvidar.

    “El Libro del Almismo, el libro del pensar” nos lleva a replantear y a repensar un poco la medicina que queremos, una medicina vuelta a pensar.

    Quiero contarles la historia de cómo se llegó a este libro y por qué y para qué se sigue trabajando en estos temas: Después de mi internado y de un trabajo un poco triste de rural, volví al Instituto de Genética y a la Universidad Javeriana en donde encontré al doctor Bernal y un espacio que estaba buscando para esa medicina diferente que quería, con un grupo de personas que me permitía no sólo ver la medicina sino ver muchas otras cosas más; había espacio para la literatura, para Mafalda, para hablar de niños, de locos, había incluso tiempo para hablar de medicina dentro del golf, de carros antiguos y de todo eso fui aprendiendo.

    Eso era lo que estaba buscando. Una medicina que diera espacios diferentes, que fuera más humanizada. Rápidamente me ubiqué y me quedé! No me arrepiento en lo absoluto de haberme quedado porque fue, ha sido y sigue siendo, una experiencia enriquecedora, de muchas vivencias importantes. Sabía exactamente dónde estaba y sabía que había que seguir rápido y había que trabajar muchos aspectos de esa medicina que estábamos buscando y de esa genética especial.

    Rápidamente empezamos a trabajar

  17. Actualidad del relativismo cultural

    OpenAIRE

    Sánchez Durá, Nicolás

    2013-01-01

    Este ensayo tiene tres propósitos. En primer lugar, propone examinar las relaciones entre etnocentrismo y relativismo. El etnocentrismo puede tomar tres formas distintas: a saber, la de una universalidad impostada, la del exotismo y la de un particularismo narcisista exacerbado. El relativismo cultural es una postura que asume la inconmensurabilidad de los conceptos y valores que deben ser considerados como válidos dentro de las imágenes del mundo definidas. En segundo lugar, se argumenta que...

  18. An ecosystemic approach to evaluating ecological, socioeconomic and group dynamics affecting the prevalence of Aedes aegypti in two Colombian towns Aproximación ecosistémica para evaluar las relaciones entre ecología, factores socioeconómicos, dinámicas sociales y la presencia del dengue en dos ciudades de Colombia

    Directory of Open Access Journals (Sweden)

    Juliana Quintero

    2009-01-01

    aumentó el riesgo siete veces (OR = 7,5; IC95%: 1,7-32,2. Se identificó una asociación inversa entre el estrato socioeconómico y la presencia del vector (Estrato bajo OR = 0,9; IC95%: 0,6-1,4; Estrato alto OR = 0,4; IC95%: 0,07-1,7. El manejo del agua es una dinámica social compleja, asociada con la presencia de Ae aegypti. El control de dengue se convierte en un reto para las autoridades en salud y para los investigadores, puesto que deben desarrollarse estrategias de prevención y promoción que tengan en cuenta aspectos culturales, socioeconómicos y de comportamiento.

  19. Ecosystem goods and services at the neighborhood scale

    Science.gov (United States)

    Mapping ecosystem functions and articulating the ecosystem goods and services (EGS) they provide to human beneficiaries are important aspects that: link human actions to human costs and benefits from ecosystem, and ultimately provide this information to the general public, public...

  20. Assessing, mapping and quantifying cultural ecosystem services at community level

    NARCIS (Netherlands)

    Plieninger, T.; Dijks, S.; Oteros Rozas, E.; Bieling, C.

    2013-01-01

    Numerous studies underline the importance of immaterial benefits provided by ecosystems and especially by cultural landscapes, which are shaped by intimate human–nature interactions. However, due to methodological challenges, cultural ecosystem services are rarely fully considered in ecosystem

  1. el Valle del Cauca

    Directory of Open Access Journals (Sweden)

    Carlos Humberto Ortiz

    2007-01-01

    Full Text Available Este artículo se enfoca en la identi- ficación de aquellos factores estructurales que explican la pérdida de dinamismo económico de largo plazo en Colombia y, en particular, en el Valle del Cauca. Se examina la competitividad del Valle en relación con Colombia y con el resto del mundo. Se cuestiona la insistencia en una estrategia exportadora como dinamizadora del desarrollo económico. Se identifica que una gran parte de la población está excluida de los beneficios del desarrollo económico. Para construir un modelo de desarrollo que incluya a esta población se recomienda recuperar la senda de la industrialización, invertir en el capital humano (educación de alta calidad, salud, salubridad y nutrición, e invertir en infraestructura. La participación del Estado en estas inversiones sociales es necesaria para disminuir la desigualdad y aumentar el crecimiento económico.

  2. Espectroscopia del Cometa Halley

    Science.gov (United States)

    Naranjo, O.; Fuenmayor, F.; Ferrin, L.; Bulka, P.; Mendoza, C.

    1987-05-01

    Se reportan observaciones espectroscópicas del cometa Halley. Los espectros fueron tomados usando el espectrógrafo del telescopio reflector de 1 metro del Observatorio Nacional de Venezuela. Se utilizó óptica azul, con una red de difracción de 600 lineas/min, obteniéndose una dispersión de 74.2 A/mm y una resolución de 2.5 A, en el rango espectral de 3500 a 6500 A. Seis placas fueron tomadas con emulsión IIa-O y dos con IIa-D. Los tiempos de exposición fueron entre 10 y 150 minutos. El cometa se encontraba entre 0.70 y 1.04 UA del Sol, y entre 1.28 y 0.73 UA de la Tierra. Las emisiones más prominentes en el espectro, son las del CN, C2, y C3. Otras emisiones detectadas corresponden a CH, NH2 y Na. Los espectros muestran un fuerte continuo, indicando un contenido significativo de polvo. Se detectó mayor intensidad del contínuo, en la dirección anti solar, lo cual es evidencia de la cola de polvo.

  3. Inventario nacional del uso actual del agua

    OpenAIRE

    Oficina Nacional de Evaluación de Recursos Naturales

    1984-01-01

    Establece como se emplea el agua en el Perú, teniendo en cuenta el tipo de uso, consuntivo y no consuntivo, discriminando según sea el destino: agrícola, pecuario, poblacional,industrial, minero, energético y pesquero, así como su localización geográfica; ello con la finalidad de que sirva de información básica para la planificación del desarrollo.

  4. Silica ecosystem for synergistic biotransformation

    Science.gov (United States)

    Mutlu, Baris R.; Sakkos, Jonathan K.; Yeom, Sujin; Wackett, Lawrence P.; Aksan, Alptekin

    2016-06-01

    Synergistical bacterial species can perform more varied and complex transformations of chemical substances than either species alone, but this is rarely used commercially because of technical difficulties in maintaining mixed cultures. Typical problems with mixed cultures on scale are unrestrained growth of one bacterium, which leads to suboptimal population ratios, and lack of control over bacterial spatial distribution, which leads to inefficient substrate transport. To address these issues, we designed and produced a synthetic ecosystem by co-encapsulation in a silica gel matrix, which enabled precise control of the microbial populations and their microenvironment. As a case study, two greatly different microorganisms: Pseudomonas sp. NCIB 9816 and Synechococcus elongatus PCC 7942 were encapsulated. NCIB 9816 can aerobically biotransform over 100 aromatic hydrocarbons, a feat useful for synthesis of higher value commodity chemicals or environmental remediation. In our system, NCIB 9816 was used for biotransformation of naphthalene (a model substrate) into CO2 and the cyanobacterium PCC 7942 was used to provide the necessary oxygen for the biotransformation reactions via photosynthesis. A mathematical model was constructed to determine the critical cell density parameter to maximize oxygen production, and was then used to maximize the biotransformation rate of the system.

  5. Plutonium in a grassland ecosystem

    International Nuclear Information System (INIS)

    Little, C.A.

    1976-08-01

    A study was made of plutonium contamination of grassland at the Rocky Flats plant northwest of Denver, Colorado. Of interest were: the definition of major plutonium-containing ecosystem compartments; the relative amounts in those compartments; how those values related to studies done in other geographical areas; whether or not the predominant isotopes, 238 Pu and 239 Pu, behaved differently; and what mechanisms might have allowed for the observed patterns of contamination. Samples of soil, litter, vegetation, arthropods, and small mammals were collected for Pu analysis and mass determination from each of two macroplots. Small aliquots (5 g or less) were analyzed by a rapid liquid scintillation technique and by alpha spectrometry. Of the compartments sampled, greater than 99 percent of the total plutonium was contained in the soil and the concentrations were significantly inversely correlated with distance from the contamination source, depth of the sample, and particle size of the sieved soil samples. The soil data suggested that the distribution of contamination largely resulted from physical transport processes

  6. Modeling the Personal Health Ecosystem.

    Science.gov (United States)

    Blobel, Bernd; Brochhausen, Mathias; Ruotsalainen, Pekka

    2018-01-01

    Complex ecosystems like the pHealth one combine different domains represented by a huge variety of different actors (human beings, organizations, devices, applications, components) belonging to different policy domains, coming from different disciplines, deploying different methodologies, terminologies, and ontologies, offering different levels of knowledge, skills, and experiences, acting in different scenarios and accommodating different business cases to meet the intended business objectives. For correctly modeling such systems, a system-oriented, architecture-centric, ontology-based, policy-driven approach is inevitable, thereby following established Good Modeling Best Practices. However, most of the existing standards, specifications and tools for describing, representing, implementing and managing health (information) systems reflect the advancement of information and communication technology (ICT) represented by different evolutionary levels of data modeling. The paper presents a methodology for integrating, adopting and advancing models, standards, specifications as well as implemented systems and components on the way towards the aforementioned ultimate approach, so meeting the challenge we face when transforming health systems towards ubiquitous, personalized, predictive, preventive, participative, and cognitive health and social care.

  7. Gerencia del cuidado-gerencia del servicio

    Directory of Open Access Journals (Sweden)

    Marta Palmet Jiménez

    2016-01-01

    Full Text Available La gerencia de este siglo debe estar plenamente identificada con la administración para planear, organizar, decidir y obtener resultados definidos, evaluados y alcanzados a través de las personas. Para poder gerenciar el cuidado se debe saber administrar. El objetivo de enfermería es cuidar; el objetivo de la gerencia es la conducción de la producción de bienes o servicios en las organizaciones. La gerencia del cuidado implica: motivación, creatividad, responsabilidad y ética por parte del cuidador y de quien cuida, claridad de actitud frente al ser y al qué hacer por parte del cuidador. Se puede concluir que la gerencia (administración, el cuidado (producto de calidad, el servicio (valor intangible, querer servir son un trinomio que deben ir de la mano de manera integrada para el logro de los objetivos propuestos por la organización de salud y de enfermería.

  8. Ecosystem services in sustainable groundwater management.

    Science.gov (United States)

    Tuinstra, Jaap; van Wensem, Joke

    2014-07-01

    The ecosystem services concept seems to get foothold in environmental policy and management in Europe and, for instance, The Netherlands. With respect to groundwater management there is a challenge to incorporate this concept in such a way that it contributes to the sustainability of decisions. Groundwater is of vital importance to societies, which is reflected in the presented overview of groundwater related ecosystem services. Classifications of these services vary depending on the purpose of the listing (valuation, protection, mapping et cetera). Though the scientific basis is developing, the knowledge-availability still can be a critical factor in decision making based upon ecosystem services. The examples in this article illustrate that awareness of the value of groundwater can result in balanced decisions with respect to the use of ecosystem services. The ecosystem services concept contributes to this awareness and enhances the visibility of the groundwater functions in the decision making process. The success of the ecosystem services concept and its contribution to sustainable groundwater management will, however, largely depend on other aspects than the concept itself. Local and actual circumstances, policy ambitions and knowledge availability will play an important role. Solutions can be considered more sustainable when more of the key elements for sustainable groundwater management, as defined in this article, are fully used and the presented guidelines for long term use of ecosystem services are respected. Copyright © 2014 Elsevier B.V. All rights reserved.

  9. Experimental assessment of ecosystem services in agriculture

    DEFF Research Database (Denmark)

    Sandhu, Harpinder; Porter, John Roy; Wratten, Steve

    2013-01-01

    Ecosystem services are the resources and processes supplied by natural ecosystems which benefit humankind (for example, pollination of crops by insects, or water filtration by wetlands). They underpin life on earth, provide major inputs to many economic sectors and support our lifestyles. Agricul......Ecosystem services are the resources and processes supplied by natural ecosystems which benefit humankind (for example, pollination of crops by insects, or water filtration by wetlands). They underpin life on earth, provide major inputs to many economic sectors and support our lifestyles....... Agricultural and urban areas are by far the largest users of ecosystems and their services and (for the first time) this book explores the role that ecosystem services play in these managed environments. The book also explores methods of evaluating ecosystem services, and discusses how these services can...... be maintained and enhanced in our farmlands and cities. This book will be useful to students and researchers from a variety of fields, including applied ecology, environmental economics, agriculture and forestry, and also to local and regional planners and policy makers....

  10. Sustaining ecosystem services in cultural landscapes

    Directory of Open Access Journals (Sweden)

    Tobias Plieninger

    2014-06-01

    Full Text Available Classical conservation approaches focus on the man-made degradation of ecosystems and tend to neglect the social-ecological values that human land uses have imprinted on many environments. Throughout the world, ingenious land-use practices have generated unique cultural landscapes, but these are under pressure from agricultural intensification, land abandonment, and urbanization. In recent years, the cultural landscapes concept has been broadly adopted in science, policy, and management. The interest in both outstanding and vernacular landscapes finds expression in the UNESCO World Heritage Convention, the European Landscape Convention, and the IUCN Protected Landscape Approach. These policies promote the protection, management, planning, and governance of cultural landscapes. The ecosystem services approach is a powerful framework to guide such efforts, but has rarely been applied in landscape research and management. With this paper, we introduce a special feature that aims to enhance the theoretical, empirical and practical knowledge of how to safeguard the resilience of ecosystem services in cultural landscapes. It concludes (1 that the usefulness of the ecosystem services approach to the analysis and management of cultural landscapes should be reviewed more critically; (2 that conventional ecosystem services assessment needs to be complemented by socio-cultural valuation; (3 that cultural landscapes are inherently changing, so that a dynamic view on ecosystem services and a focus on drivers of landscape change are needed; and (4 that managing landscapes for ecosystem services provision may benefit from a social-ecological resilience perspective.

  11. Strategies for conservation of endangered ecosystems

    International Nuclear Information System (INIS)

    Ashraf, M.; Hussain, M.; Ahmad, M.S.A.

    2012-01-01

    The planet Earth is known to host a rich biodiversity owing to its suitable environmental conditions for life and at a larger scale it is regarded as a major ecosystem. Healthy existence of living organisms in this ecosystem depends on proper functioning of all the associated environmental factors. Since millennia, living organisms have adapted to thrive under a limited range of environmental conditions. Nevertheless previous history of the earth and fossil records indicates that the biodiversity housed by the planet earth has experienced five major catastrophic extinctions due to change in physical environment. Even currently, it is undergoing sixth major extinction event mainly due to anthropogenic activities. The human activities are proving a dual menace for biodiversity. On the one hand, it is causing habitat loss through intensive deforestation, conversion of different natural plant communities for agriculture, and urbanization and industrialization. Moreover, it is resulting in habitat degradation by polluting both terrestrial and aquatic ecosystems, emitting air pollutants resulting in acid rains, ozone layer depletion, global warming, heavy metal contamination and eutrophication of water bodies. As a result, healthy existence of both terrestrial and aquatic ecosystems and their associated biodiversity is altogether threatened. Worldwide efforts are underway to conserve the threatened ecosystems and their related biodiversity. A number of international conventions have been held to conserve natural ecosystems. Pakistan being a signatory of these conventions has its obligation to join hands with international community to conserve the endangered ecosystems within as well as outside its bounds. Under the existing scenario the objective of organizing this symposium was to pinpoint the threats to endangered ecosystems of the world in general and those in Pakistan in particular, and to develop suitable strategies for conservation of such paralyzed ecosystems

  12. Parallel Computing for Terrestrial Ecosystem Carbon Modeling

    International Nuclear Information System (INIS)

    Wang, Dali; Post, Wilfred M.; Ricciuto, Daniel M.; Berry, Michael

    2011-01-01

    Terrestrial ecosystems are a primary component of research on global environmental change. Observational and modeling research on terrestrial ecosystems at the global scale, however, has lagged behind their counterparts for oceanic and atmospheric systems, largely because the unique challenges associated with the tremendous diversity and complexity of terrestrial ecosystems. There are 8 major types of terrestrial ecosystem: tropical rain forest, savannas, deserts, temperate grassland, deciduous forest, coniferous forest, tundra, and chaparral. The carbon cycle is an important mechanism in the coupling of terrestrial ecosystems with climate through biological fluxes of CO 2 . The influence of terrestrial ecosystems on atmospheric CO 2 can be modeled via several means at different timescales. Important processes include plant dynamics, change in land use, as well as ecosystem biogeography. Over the past several decades, many terrestrial ecosystem models (see the 'Model developments' section) have been developed to understand the interactions between terrestrial carbon storage and CO 2 concentration in the atmosphere, as well as the consequences of these interactions. Early TECMs generally adapted simple box-flow exchange models, in which photosynthetic CO 2 uptake and respiratory CO 2 release are simulated in an empirical manner with a small number of vegetation and soil carbon pools. Demands on kinds and amount of information required from global TECMs have grown. Recently, along with the rapid development of parallel computing, spatially explicit TECMs with detailed process based representations of carbon dynamics become attractive, because those models can readily incorporate a variety of additional ecosystem processes (such as dispersal, establishment, growth, mortality etc.) and environmental factors (such as landscape position, pest populations, disturbances, resource manipulations, etc.), and provide information to frame policy options for climate change

  13. Digital asset ecosystems rethinking crowds and cloud

    CERN Document Server

    Blanke, Tobias

    2014-01-01

    Digital asset management is undergoing a fundamental transformation. Near universal availability of high-quality web-based assets makes it important to pay attention to the new world of digital ecosystems and what it means for managing, using and publishing digital assets. The Ecosystem of Digital Assets reflects on these developments and what the emerging 'web of things' could mean for digital assets. The book is structured into three parts, each covering an important aspect of digital assets. Part one introduces the emerging ecosystems of digital assets. Part two examines digital asset manag

  14. Global Mapping of Provisioning Ecosystem Services

    Science.gov (United States)

    Bingham, Lisa; Straatsma, Menno; Karssenberg, Derek

    2016-04-01

    Attributing monetary value to ecosystem services for decision-making has become more relevant as a basis for decision-making. There are a number of problematic aspects of the calculations, including consistency of economy represented (e.g., purchasing price, production price) and determining which ecosystem subservices to include in a valuation. While several authors have proposed methods for calculating ecosystem services and calculations are presented for global and regional studies, the calculations are mostly broken down into biomes and regions without showing spatially explicit results. The key to decision-making for governments is to be able to make spatial-based decisions because a large spatial variation may exist within a biome or region. Our objective was to compute the spatial distribution of global ecosystem services based on 89 subservices. Initially, only the provisioning ecosystem service category is presented. The provisioning ecosystem service category was calculated using 6 ecosystem services (food, water, raw materials, genetic resources, medical resources, and ornaments) divided into 41 subservices. Global data sets were obtained from a variety of governmental and research agencies for the year 2005 because this is the most data complete and recent year available. All data originated either in tabular or grid formats and were disaggregated to 10 km cell length grids. A lookup table with production values by subservice by country were disaggregated over the economic zone (either marine, land, or combination) based on the spatial existence of the subservice (e.g. forest cover, crop land, non-arable land). Values express the production price in international dollars per hectare. The ecosystem services and the ecosystem service category(ies) maps may be used to show spatial variation of a service within and between countries as well as to specifically show the values within specific regions (e.g. countries, continents), biomes (e.g. coastal, forest

  15. Mediated Trust in the Innovation Ecosystem

    DEFF Research Database (Denmark)

    Mogensen, Kirsten

    This paper introduces a framework for further studies in the role of mediated trust in the innovation ecosystems. Combining insight from scholars like Etzkowitz, Russel and Nordfors, the concept of innovation ecosystem is described as an extended Triple Helix where media is seen as a fourth strand...... should be considered trustworthy. When receiving the message, the audience will decode the signals. Trust is considered fundamental for mass media if these are to fulfill their normative functions in the innovation ecosystem. However, the concept of trust is not clearly defined in the literature and we...

  16. From theoretical to actual ecosystem services: mapping beneficiaries and spatial flows in ecosystem service assessments

    Directory of Open Access Journals (Sweden)

    Kenneth J. Bagstad

    2014-06-01

    Full Text Available Ecosystem services mapping and modeling has focused more on supply than demand, until recently. Whereas the potential provision of economic benefits from ecosystems to people is often quantified through ecological production functions, the use of and demand for ecosystem services has received less attention, as have the spatial flows of services from ecosystems to people. However, new modeling approaches that map and quantify service-specific sources (ecosystem capacity to provide a service, sinks (biophysical or anthropogenic features that deplete or alter service flows, users (user locations and level of demand, and spatial flows can provide a more complete understanding of ecosystem services. Through a case study in Puget Sound, Washington State, USA, we quantify and differentiate between the theoretical or in situ provision of services, i.e., ecosystems' capacity to supply services, and their actual provision when accounting for the location of beneficiaries and the spatial connections that mediate service flows between people and ecosystems. Our analysis includes five ecosystem services: carbon sequestration and storage, riverine flood regulation, sediment regulation for reservoirs, open space proximity, and scenic viewsheds. Each ecosystem service is characterized by different beneficiary groups and means of service flow. Using the ARtificial Intelligence for Ecosystem Services (ARIES methodology we map service supply, demand, and flow, extending on simpler approaches used by past studies to map service provision and use. With the exception of the carbon sequestration service, regions that actually provided services to people, i.e., connected to beneficiaries via flow paths, amounted to 16-66% of those theoretically capable of supplying services, i.e., all ecosystems across the landscape. These results offer a more complete understanding of the spatial dynamics of ecosystem services and their effects, and may provide a sounder basis for

  17. Determinantes del ingreso y del gasto corriente de los hogares

    OpenAIRE

    Muñoz C., Manuel

    2004-01-01

    Este ensayo de investigación empírica analiza los determinantes del ingreso y del gasto en los hogares colombianos. Utilizando un modelo del ciclo de vida con datos de la encuesta de hogares de 1994 y 1995, muestra que el comportamiento del ingreso está afectado principalmente por las características demográficas del hogar y los rasgos socio ocupacionales de sus miembros. El comportamiento del gasto está determinado ante todo por el ingreso y, en menor medida, por las características sociales...

  18. Las fluctuaciones del nivel del mar durante el Cuaternario

    OpenAIRE

    Pousa, Jorge Lorenzo; Isla, Federico Ignacio; Schnack, Enrique Jorge

    2002-01-01

    Los cambios del nivel del mar han ejercido una fuerte influencia en la evolución del planeta y en la historia de la humanidad. En una escala de tiempo geológico, las variaciones de los niveles oceánicos han dejado un registro ampliamente distribuido en la forma de depósitos sedimentarios. El descenso del nivel del mar durante la Ultima Glaciación, que alcanzó unos 120 metros hace 18.000 años, permitió la emergencia del estrecho de Bering y la migración humana desde Eurasia hacia América. Se e...

  19. La imagen del pase.

    Directory of Open Access Journals (Sweden)

    Hernando Bernal.

    1999-11-01

    Full Text Available A partir de un texto del poeta Octavio Paz llamado «La imagen», se busca proseguir la equivalencia entre las imágenes de la poesía y la función que ellas tienen para el poeta, y el fantasma fundamental y su función para el analizante que está en el momento del pase. Se parte de la idea de que la poesía busca entrar en el ser así como el psicoanálisis tiene como finalidad apuntar al corazón del ser del sujeto. Se hace entonces una distinción del concepto de «ser» para el psicoanálisis, haciendo alusión también al discurso de la filosofía. Esclarecido el sentido de lo que es el «ser» para el psicoanálisis, se aborda de lleno – entre otras cosas, relacionadas con la experiencia del pase específicamente- la equivalencia entre la definición que hace Octavio Paz de «La Imagen» y el momento del pase en el análisis de un sujeto, imagen que, al igual que el mito para la filosofía, las leyes para la ciencia y el matema para el psicoanálisis, se constituyen en los instrumentos con los que cada una de estas disciplinas horadan en lo real.

  20. Organogénesis del sistema digestivo del pez Pterophylum scalare (Perciformes: Cichlidae

    Directory of Open Access Journals (Sweden)

    Mireya Ávila Botello

    2008-12-01

    Full Text Available Debido a la poca información sobre el desarrollo de sistemas orgánicos en el pez Pterophylum scalare (Liechtenstein 1823 estudiamos yiempo neto de desarrollo de cada estadio de la organogénesis, tiempo acumulado y diferenciación de estructuras características de cada estadio. Se obtuvo un total de 8 estadios en la organogénesis del sistema digestivo, comprendidos entre la gástrula y la reabsorción total del saco vitelino. La duración de la organogénesis del sistema digestivo fue de 119 horas 44 minutos.Organogenesis of the digestive system of the fish Pterophylum scalare (Perciformes: Cichlidae. There is little knowledge on the development of the angelfish Pterophyllum scalare (Liechtenstein 1823, a species of economical and biological value for inland water ecosystems. We recorded net development time of each organogenetic stage, cumulative time and characteristic structure differentiation for each stage. We found eight organogenetic stages for the digestive system, between the gastrula and the total re-adsorption of the vitelin sack. The total time for the organogenetic development of the digestive system was 119 hours and 44 minutes. Rev. Biol. Trop. 56 (4: 1857-1870. Epub 2008 December 12.