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Sample records for huemul hippocamelus bisulcus

  1. Huemul: a two dimensional multigroup collision probability code for general geometries

    International Nuclear Information System (INIS)

    Calabrese, C.R.; Grant, C.R.

    1990-01-01

    The control rod calculation and the necessity of having a 2-D transport code able to calculate geometries as different as pool reactor or power reactor control rods resulted in the development of a new tool according to these requirements. This new tool permits a 2-D spatial representation, and the calculation mesh is formed by circumferential arcs segments not necessarily parallel to the coordinate axis. It includes the possibility of considering boundary conditions in the form of an albedo matrix (J + /J - ) as well as different external currents for each face of the model. It also allows an arbitrary number of energy groups compatible with computer limitations. These possibilities make HUEMUL a useful tool for a great variety of control rod or supercell type calculations. HUEMUL has been tested with copper activity measurements performed in the Canadian D2O facility ZED-2 with stainless-steel adjuster rods obtaining a very good agreement (better than 2%). Also manganese activity measurements in RA-2 pool reactor were used to compare calculated and measured values inside a MTR fuel element calculations, (better than 1%). Comparisons with results from the WIMS code for a light water cell with 3% enriched UO 2 has also shown a very good agreement in fluxes and multiplication constant (better than 1.5% in fluxes and 50 pcm in k-infinity). (Author) [es

  2. Calculation of the CAREM reactor with the HUEMUL-PUMA-THERMIT chain of codes; Calculo del reactor CAREM con la cadena de codigos HUEMUL-PUMA-THERMIT

    Energy Technology Data Exchange (ETDEWEB)

    Notari, Carla; Grant, Carlos R [Comision Nacional de Energia Atomica, General San Martin (Argentina)

    2000-07-01

    The purpose of the work was the evaluation of the the CAREM 25 reactor core, using a chain of codes (HUEMUL-PUMA-THERMIT) different to the one used in the original design (CONDOR-CITVAP-THERMIT). First, we performed a partial validation of the our codes in lattices similar to CAREM and reproduced a benchmark for simulation of gadolinium burnup. The results were considered satisfactory for this stage of the project. Then, we calculated the core along the normal operating equilibrium cycle and in hot and cold shut-down conditions. The main outcome of our evaluation confirms the general behaviour of the reference calculations except in one important point referring to the cold shut down. In this condition, the failure of one single rod of bank number 13 of the shut down system, leaves the core in a supercritical state at the beginning of the cycle and this anomaly persists during almost a third of the overall cycle. A new design of the core is proposed with minor modifications of the reference one, without introducing new types of fuel elements and keeping the same fuel management scheme. This new core fulfills all the design requirements. (author)

  3. Anatomical and histological description of the male taruca reproductive organs (Hippocamelus antisensis, d'Orbigny 1834

    Directory of Open Access Journals (Sweden)

    Pacheco JI

    2017-08-01

    Full Text Available The taruca is the largest species of cervid native of the Peruvian Andes, which is in a vulnerable state, a circumstance by which it is necessary to carry out studies regarding its anatomy and reproductive physiology, in the future, to implement reproductive biotechnologies for its conservation. The anatomy and histological structure of the reproductive organs of an adult male Hippocamelus antisensis specimen is described and sent to the IVITA Maranganí, UNMSM station by the SERFOR Cusco with custody act No. 042-2015-SERFOR-ATFFS CUSCO for Research purposes, the same one that died in the Zoo of Tipon - Cusco. The external reproductive organs are described, which present anatomical disposition similar to other artiodactyls, with the peculiarity of being covered with secretions and odors characteristic of the species; Have vesicles of the deferent, testicles represent 3.4% of the body weight, there are three adjoining glands: vesicular glands, prostate and bulbourethral glands, fibroelastic penis without sigmoid flexure, glans does not present urethral process, histologically the testis presents The structure similar to other species of artiodactyls, the epididymis shows sperm content, the vas deferens presents a broad muscular tunica, in conclusion the characteristics are similar to other cervids and also to domestic species like the ram and the goat

  4. Calculation of the CAREM reactor with the HUEMUL-PUMA-THERMIT chain of codes

    International Nuclear Information System (INIS)

    Notari, Carla; Grant, Carlos R.

    2000-01-01

    The purpose of the work was the evaluation of the the CAREM 25 reactor core, using a chain of codes (HUEMUL-PUMA-THERMIT) different to the one used in the original design (CONDOR-CITVAP-THERMIT). First, we performed a partial validation of the our codes in lattices similar to CAREM and reproduced a benchmark for simulation of gadolinium burnup. The results were considered satisfactory for this stage of the project. Then, we calculated the core along the normal operating equilibrium cycle and in hot and cold shut-down conditions. The main outcome of our evaluation confirms the general behaviour of the reference calculations except in one important point referring to the cold shut down. In this condition, the failure of one single rod of bank number 13 of the shut down system, leaves the core in a supercritical state at the beginning of the cycle and this anomaly persists during almost a third of the overall cycle. A new design of the core is proposed with minor modifications of the reference one, without introducing new types of fuel elements and keeping the same fuel management scheme. This new core fulfills all the design requirements. (author)

  5. The taruca (Hippocamelus antisensis) and the red brocket deer (Mazama americana) as intermediate hosts of Taenia hydatigena in Peru, morphological and molecular evidence.

    Science.gov (United States)

    Gomez-Puerta, Luis A; Pacheco, Joel; Gonzales-Viera, Omar; Lopez-Urbina, Maria T; Gonzalez, Armando E

    2015-09-15

    In the present report metacestodes were collected from the mesentery of a taruca (Hippocamelus antisensis) and from the omentum of a red brocket deer (Mazama americana) in Peru. Various metacestodes parameters, including rostellar hook characteristics, were measured. Molecular analysis was performed to amplify the mitochondrial cytochrome c oxidase subunit 1 gene from metacestode isolates. Metacestodes were identified as T. hydatigena by morphology and molecular methods. This constitutes the first molecular detection of T. hydatigena metacestodes in the taruca and the red brocket deer and demonstrates that these animal species are natural intermediate hosts for this parasite. Copyright © 2015 Elsevier B.V. All rights reserved.

  6. Presencia de Antifer ultra Ameghino (=Antifer niemeyeri Casamiquela (Artiodactyla, Cervidae en el Pleistoceno tardío-Holoceno temprano de Chile central (30-35°S Presence of Antifer ultra Ameghino (=Antifer niemeyeri Casamiquela in the late Pleistocene-early Holocene of Central Chile (30-35°S

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    Rafael Labarca E

    2011-01-01

    Full Text Available El presente trabajo discute el estatus taxonómico de la especie Antifer niemeyeri Casamiquela, 1984, definida a partir de astas completas procedentes de la laguna Taguatagua y la quebrada de Quereo (Pleistoceno tardío-Holoceno temprano, en Chile central (30-35°S. Se concluye, a partir de un estudio morfológico y morfométrico detallado, que Antifer niemeyeri debe ser considerado sinónimo de Antifer ultra Ameghino, 1889 dados los caracteres anatómicos compartidos con esta especie. Los resultados amplían la distribución geográfica del taxón, que previamente se registraba en Argentina, Uruguay y sur de Brasil, y confirman su biocrón para el Pleistoceno tardío-Holoceno temprano (edad Lu-janense, aun cuando las fechas radiocarbónicas de Chile central (ca. 9.900 años 14C AP corresponden a las más tardías para la especie. A la luz de la evidencia paleoclimática disponible, se vincula A ultra durante el Pleistoceno de Chile central a ambientes cálidos y abiertos. Considerando estos requerimientos, se discute su posible vía de ingreso al actual territorio chileno a través de corredores ubicados hacia el sur del macizo andino, y su coexistencia con Hippocamelus bisulcus Molina, 1782. De acuerdo a la información estratigráfica y paleoambiental, se postula que ambas especies habrían sido alopátridas, por lo menos en el área de estudio.This paper discusses the taxonomic status of Antifer niemeyeri Casamiquela, 1984, defined from complete antlers from Taguatagua lake and Quereo canyon, both located in central Chile (30-35°S. From a detailed morphological and moiphometrical study, it is concluded that Antifer niemeyeri should be considered synonymous with Antifer ultra Ameghino, 1889, due to the anatomical characters shared between both forms. These results expand the geographical distribution of this taxa previously recorded in Argentina, Uruguay and southern Brazil, confirming their late Pleistocene-early Holocene biochron, in spite

  7. Molecular identification of Anaplasma marginale in two autochthonous South American wild species revealed an identical new genotype and its phylogenetic relationship with those of bovines.

    Science.gov (United States)

    Guillemi, Eliana C; de la Fourniere, Sofía; Orozco, Marcela; Peña Martinez, Jorge; Correa, Elena; Fernandez, Javier; Lopez Arias, Ludmila; Paoletta, Martina; Corona, Belkis; Pinarello, Valérie; Wilkowsky, Silvina E; Farber, Marisa D

    2016-05-26

    Anaplasma marginale is a well-known cattle pathogen of tropical and subtropical world regions. Even though, this obligate intracellular bacterium has been reported in other host species different than bovine, it has never been documented in Myrmecophaga tridactyla (giant anteater) or Hippocamelus antisense (taruca), which are two native endangered species. Samples from two sick wild animals: a Myrmecophaga tridactyla (blood) and a Hippocamelus antisense (blood and serum) were studied for the presence of A. marginale DNA through msp5 gene fragment amplification. Further characterization was done through MSP1a tandem repeats analysis and MLST scheme and the genetic relationship among previously characterized A. marginale sequences were studied by applying, eBURST algorithm and AMOVA analysis. Anaplasma marginale DNA was identified in the Myrmecophaga tridactyla and Hippocamelus antisense samples. Through molecular markers, we identified an identical genotype in both animals that was not previously reported in bovine host. The analysis through eBURST and AMOVA revealed no differentiation between the taruca/anteater isolate and the bovine group. In the present publication we report the identification of A. marginale DNA in a novel ruminant (Hippocamelus antisense) and non-ruminant (Myrmecophaga tridactyla) host species. Genotyping analysis of isolates demonstrated the close relatedness of the new isolate with the circulation population of A. marginale in livestock. Further analysis is needed to understand whether these two hosts contribute to the anaplasmosis epidemiology.

  8. Dvě výročí Ronalda Richtra – rodáka ze Sokolova

    Czech Academy of Sciences Publication Activity Database

    Řípa, Milan

    2011-01-01

    Roč. 59, č. 23 (2011), s. 28-28 ISSN 0040-1064 Institutional research plan: CEZ:AV0Z20430508 Keywords : fusion * Huemul Project * Juan Peron * Matterhorn * Dmitrij Sacharov * Jevgenij Tamm * Lyman Spitzer * Ronald Richter Subject RIV: BL - Plasma and Gas Discharge Physics

  9. Validation of finite element code DELFIN by means of the zero power experiences at the nuclear power plant of Atucha I; Convalidacion del codigo DELFIN por medio de las experiencias a potencia cero de la central nuclear Atucha I

    Energy Technology Data Exchange (ETDEWEB)

    Grant, C R [Comision Nacional de Energia Atomica, San Martin (Argentina). Unidad de Actividad Reactores y Centrales Nucleares

    1997-12-31

    Code DELFIN, developed in CNEA, treats the spatial discretization using heterogeneous finite elements, allowing a correct treatment of the continuity of fluxes and currents among elements and a more realistic representation of the hexagonal lattice of the reactor. It can be used for fuel management calculation, Xenon oscillation and spatial kinetics. Using the HUEMUL code for cell calculation (which uses a generalized two dimensional collision probability theory and has the WIMS library incorporated in a data base), the zero power experiences performed in 1974 were calculated. (author). 8 refs., 9 figs., 3 tabs.

  10. Validation of finite element code DELFIN by means of the zero power experiences at the nuclear power plant of Atucha I

    International Nuclear Information System (INIS)

    Grant, C.R.

    1996-01-01

    Code DELFIN, developed in CNEA, treats the spatial discretization using heterogeneous finite elements, allowing a correct treatment of the continuity of fluxes and currents among elements and a more realistic representation of the hexagonal lattice of the reactor. It can be used for fuel management calculation, Xenon oscillation and spatial kinetics. Using the HUEMUL code for cell calculation (which uses a generalized two dimensional collision probability theory and has the WIMS library incorporated in a data base), the zero power experiences performed in 1974 were calculated. (author). 8 refs., 9 figs., 3 tabs

  11. Validation of Neutron Calculation Codes and Models by means of benchmark cases in the frame of the Binational Commission of Nuclear Energy. Probabilistic Models

    International Nuclear Information System (INIS)

    Dos Santos, Adimir; Siqueira, Paulo de Tarso D.; Andrade e Silva, Graciete Simões; Grant, Carlos; Tarazaga, Ariel E.; Barberis, Claudia

    2013-01-01

    In year 2008 the Atomic Energy National Commission (CNEA) of Argentina, and the Brazilian Institute of Energetic and Nuclear Research (IPEN), under the frame of Nuclear Energy Argentine Brazilian Agreement (COBEN), among many others, included the project “Validation and Verification of Calculation Methods used for Research and Experimental Reactors . At this time, it was established that the validation was to be performed with models implemented in the deterministic codes HUEMUL and PUMA (cell and reactor codes) developed by CNEA and those ones implemented in MCNP by CNEA and IPEN. The necessary data for these validations would correspond to theoretical-experimental reference cases in the research reactor IPEN/MB-01 located in São Paulo, Brazil. The staff of the group Reactor and Nuclear Power Studies (SERC) of CNEA, from the argentine side, performed calculations with deterministic models (HUEMUL-PUMA) and probabilistic methods (MCNP) modeling a great number of physical situations of de reactor, which previously have been studied and modeled by members of the Center of Nuclear Engineering of the IPEN, whose results were extensively provided to CNEA. In this paper results of comparison of calculated and experimental results for critical configurations, temperature coefficients, kinetic parameters and fission rates evaluated with probabilistic models spatial distributions are shown. (author)

  12. Validation of Neutron Calculation Codes and Models by means of benchmark cases in the frame of the Binational Commission of Nuclear Energy. Criticality Experiments

    International Nuclear Information System (INIS)

    Dos Santos, Adimir; Siqueira, Paulo de Tarso D.; Andrade e Silva, Graciete Simões; Grant, Carlos; Tarazaga, Ariel E.; Barberis, Claudia

    2013-01-01

    In year 2008 the Atomic Energy National Commission (CNEA) of Argentina, and the Brazilian Institute of Energetic and Nuclear Research (IPEN), under the frame of Nuclear Energy Argentine Brazilian Agreement (COBEN), among many others, included the project “Validation and Verification of Calculation Methods used for Research and Experimental Reactors . At this time, it was established that the validation was to be performed with models implemented in the deterministic codes HUEMUL and PUMA (cell and reactor codes) developed by CNEA and those ones implemented in MCNP by CNEA and IPEN. The necessary data for these validations would correspond to theoretical-experimental reference cases in the research reactor IPEN/MB-01 located in São Paulo, Brazil. The staff of the group Reactor and Nuclear Power Studies (SERC) of CNEA, from the argentine side, performed calculations with deterministic models (HUEMUL-PUMA) and probabilistic methods (MCNP) modeling a great number of physical situations of de reactor, which previously have been studied and modeled by members of the Center of Nuclear Engineering of the IPEN, whose results were extensively provided to CNEA. In this paper results for critical configurations are shown. (author)

  13. Validation of Neutron Calculation Codes and Models by means of benchmark cases in the frame of the Binational Commission of Nuclear Energy. Kinetic Parameters, Temperature Coefficients and Power Distribution

    International Nuclear Information System (INIS)

    Dos Santos, Adimir; Siqueira, Paulo de Tarso D.; Andrade e Silva, Graciete Simões; Grant, Carlos; Tarazaga, Ariel E.; Barberis, Claudia

    2013-01-01

    In year 2008 the Atomic Energy National Commission (CNEA) of Argentina, and the Brazilian Institute of Energetic and Nuclear Research (IPEN), under the frame of Nuclear Energy Argentine Brazilian Agreement (COBEN), among many others, included the project “Validation and Verification of Calculation Methods used for Research and Experimental Reactors . At this time, it was established that the validation was to be performed with models implemented in the deterministic codes HUEMUL and PUMA (cell and reactor codes) developed by CNEA and those ones implemented in MCNP by CNEA and IPEN. The necessary data for these validations would correspond to theoretical-experimental reference cases in the research reactor IPEN/MB-01 located in São Paulo, Brazil. The staff of the group Reactor and Nuclear Power Studies (SERC) of CNEA, from the argentine side, performed calculations with deterministic models (HUEMUL-PUMA) and probabilistic methods (MCNP) modeling a great number of physical situations of de reactor, which previously have been studied and modeled by members of the Center of Nuclear Engineering of the IPEN, whose results were extensively provided to CNEA. In this paper results of comparison of calculated and experimental results for temperature coefficients, kinetic parameters and fission rates spatial distributions are shown. (author)

  14. PRAMU. Contamination sources

    International Nuclear Information System (INIS)

    Asenjo, Armando R.

    2000-01-01

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

  15. Chronicle on the Malargue uranium plant

    International Nuclear Information System (INIS)

    Gregui, Jose E.

    2009-01-01

    After the Second World War all countries that had industrial development programs, began their works in the nuclear field: if they would achieve satisfactory results depend on their scientific and technological level and on the political choices. Argentina was among those nations that had an industrial development program and very early began a series of actions in the area that at the same time was called 'atomic energy'. Uranium was the basic requirement to design a nuclear program. As a result of the first studies undertaken in the country several uraniferous deposits were discovered. The most important discovery was on May 31, 1952: the Huemul Reservoir located 40 km south of Malargue in the province of Mendoza. The site marks the beginning of the story. (author) [es

  16. Use of heterogeneous finite elements generated by collision probability solutions to calculate a pool reactor core

    International Nuclear Information System (INIS)

    Calabrese, C.R.; Grant, C.R.

    1990-01-01

    This work presents comparisons between measured fluxes obtained by activation of Manganese foils in the light water, enriched uranium research pool reactor RA-2 MTR (Materials Testing Reactors) fuel element) and fluxes calculated by the finite element method FEM using DELFIN code, and describes the heterogeneus finite elements by a set of solutions of the transport equations for several different configurations obtained using the collision probability code HUEMUL. The agreement between calculated and measured fluxes is good, and the advantage of using FEM is showed because to obtain the flux distribution with same detail using an usual diffusion calculation it would be necessary 12000 mesh points against the 2000 points that FEM uses, hence the processing time is reduced in a factor ten. An interesting alternative to use in MTR fuel management is presented. (Author) [es

  17. Uranium mining environmental restoration project (PRAMU)

    International Nuclear Information System (INIS)

    Asenjo, A.

    2002-01-01

    The National Atomic Energy Commission (CNEA) started its activities 50 years ago and obtained significant results. At the present time, the CNEA is defined as an Institution of research and development in the nuclear field. It is also responsible for the management of radioactive wastes and the dismantling of nuclear and radioactive facilities. Mining and milling activities have been carried out during the past 40 years and at present the CNEA is undertaking the Uranium Mining Environmental Restoration Project (PRAMU). The aim of this project is to restore the environment as much as is possible in all places where uranium mining and milling activities were developed when taking into consideration both economic and technical reality. First, the characteristics of the problems in each site are determined through appropriate studies which identify the existing or potential impacts, the possible pathways of contamination, etc. The sites being studied are: MALARGUE (Mendoza Province), CORDOBA (Cordoba Province), LOS GIGANTES (Cordoba Province), HUEMUL (Mendoza Province), PICHINAN (Chubut Province), TONCO (Salta Province), LA ESTELA (San Luis Province), LOS COLORADOS (La Rioja Province). PRAMU seeks to improve the current conditions of the tailings deposits and mines and to ensure the long term protection of people and the environment. The CNEA is required to comply with all legislation that is in force and is under the control of various national, provincial and local State institutions. The main objectives of the project for the various sites are: (a) Malargue site: to implement the actions necessary for environmental restoration and management of the tailings derived from the uranium ores processed in the industrial plant; (b) Cordoba and Los Gigantes sites: to design, engineer and execute the activities required for closure of the sites; (c) Other sites (Huemul, Pichinan, Tonco, La Estela, Los Colorados): to develop an environmental evaluation and, on the basis of

  18. Philodryas chamissonis (Reptilia: Squamata: Colubridae preys on the arboreal marsupial Dromiciops gliroides (Mammalia: Microbiotheria: Microbiotheriidae Philodryas chamissonis (Reptilia: Squamata: Dipsadidae predando o marsupial arborícola Dromiciops gliroides (Mammalia: Microbiotheria: Microbiotheriidae

    Directory of Open Access Journals (Sweden)

    S. Muñoz-Leal

    2013-02-01

    Full Text Available Philodryas chamissonis, the Chilean long-tailed snake, is a diurnal predator mainly of Liolaemus lizards, but also of amphibians, birds, rodents and juvenile rabbits. Dromiciops gliroides (Colocolo opossum is an arboreal marsupial endemic of temperate rainforest of southern South America. Little information is available about this marsupial's biology and ecology. Here we report the predation of one Colocolo opossum by an adult female P. chamissonis in a mixed Nothofagus forest, composed mainly by N. dombeyi, N. glauca and N. alpina trees, in the "Huemules de Niblinto" National Reserve, Nevados de Chillán, Chile. Since these two species have different activity and habitat use patterns, we discuss how this encounter may have occurred. Although it could just have been an opportunistic event, this finding provides insights into the different components of food chains in forest ecosystems of Chile.Philodryas chamissonis, cobra de cauda comprida ("Culebra de cola larga", é uma cobra diurna, predadora principalmente de lagartos do gênero Liolaemus, mas também de anfíbios, aves, roedores e coelhos jovens. Dromiciops gliroides (colocolo é um marsupial arborícola endêmico das florestas temperadas do sul da América do Sul. Há pouca informação disponível sobre a biologia e a ecologia deste marsulpial. É reportada, neste estudo, a predação de um colocolo por uma fêmea adulta de P. chamissonis, em uma floresta mista de Nothofagus, composta principalmente por árvores N. dombeyi, N. glauca e N. alpina, na Reserva Nacional de Huemules de Niblinto, Nevados de Chillán, Chile. Uma vez que estas duas espécies possuem diferentes padrões de atividade e de uso de habitat, discute-se como este evento poder ter ocorrido. Embora este possa ter sido apenas um evento oportunístico, o achado fornece novas informações sobre os diferentes componentes da cadeia alimentar nos ecossistemas florestais do Chile.

  19. Variabilidad genética en géneros de ciervos neotropicales (Mammalia: Cervidae según loci microsatelitales

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    Manuel Ruiz-García

    2009-09-01

    Full Text Available Los programas de conservación de especies se apoyan fuertemente en estudios de genética poblacional. En el presente estudio, reportamos diversos análisis genéticopoblacionales en ocho especies de cérvidos neotropicales (Mazama americana, M. gouzaoubira, M. rufina, Odocoileus virginianus, Hippocamelus antisensis, Pudu mephistopholes, Ozotoceros bezoarticus y Blastoceros dichotomus y, adicionalmente, en varias especies de cérvidos europeos y asiáticos (Cervus elaphus, C. nippon, Capreolus capreolus, C. pygargus and Dama dama. Una de esas especies europeas, la población de Cervus elaphus en Escocia, fue tomada como una población con un grado muy elevado de diversidad genética ya que proviene del cruce de diferentes grupos de ciervos rojos procedentes de diversas subespecies de la Europa continental. Desde una perspectiva de una diversidad genética depauperada, se tomó el nivel encontrado en una población de ciervos sika (Cervus nippon en Escocia, que prácticamente no mostró variabilidad a nivel molecular. Respecto a esos dos casos que consideramos como de elevada y escasa variabilidad genética, encontramos que las poblaciones analizadas de Mazama americana, M. gouzaoubira y Odocoileus virginianus estuvieron cerca del límite máximo encontrado para el ciervo rojo escocés (H=0.64, 0.70 y 0.61, respectivamente, mientras que M. rufina mostró el más bajo grado de variabilidad genética de las especies neotropicales, cercano al extremo mínimo presentado por C. nippon. Algunas de las muestras de Mazama y de Odocoileus, tomadas a nivel macrogeográfico, mostraron un exceso de homocigotos debido, probablemente, a la existencia de efecto Wahlund (efecto de subdivisión. Ninguna de las especies analizadas parece haber atravesado un cuello de botella reciente.Genetic variability in Neotropical deer genera (Mammalia: Cervidae according to DNA microsatellite loci. Species conservation programs are highly based on analyses of population

  20. ¿A qué grupo étnico perteneció la misteriosa tribu enoo (Estrecho de Magallanes, 1599?

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    David Williams

    2015-01-01

    Full Text Available En 1599, el marino holandés Oliver van Noort halló en el Estrecho de Magallanes a un grupo de nativos de talla semejante a la de los europeos de la época, con cuerpos y tórax amplios. Los mismos cazaban pingüinos para alimentarse y vestirse, usaban arcos y flechas, vivían en cuevas naturales, y eran presuntamente canoeros. En un confuso episodio, la mayoría de ellos fueron muertos mediante armas de fuego, cautivándose varios niños. Uno de ellos enseñó a sus captores algunas palabras de su propio idioma, de las que destacamos el autónimo de la tribu: 1. Se han realizado varios intentos de identificar la etnia a la cual pertenecían los infortunados nativos, concluyéndose en general que se trataba de alacalufes. Sobre la base de las palabras rescatadas por Van Noort, y con ayuda de otro documento poco conocido, el autor concluye que los enoo pertenecían a la etnia yamana –también conocida como yaganes– o que eran una tribu mixta yámana-chon. Además, desde que la zona en que fueron hallados los enoo en el siglo XVI es cercana a aquella ocupada por la tribu huemul, mixta fueguino-chon, hallada en el siglo XIX, se plantea la hipótesis de que los segundos pudieran ser descendientes de los primeros.

  1. A short environmental report on 'De Las Gallinas island'

    International Nuclear Information System (INIS)

    Romero, Claudio; Gho, Carlos J.; Quiroga, Juan J.; De Nicola, Juan; Rico, Nestor; Isnardi, Edgardo; Malagamba, Eduardo

    2003-01-01

    of pastures and the very scarce presence of exotic invading weeds. The main results of this work are: The island shows an enormous potential in terms of conservation, with a particular structure of almost no anthropic intervention. Facing the lack of updated scientific studies on the island, as a first step it would be recommendable to make a systematic characterization of its area, allowing a detailed knowledge of its ecological issues. This task should be done prior to any decision on its way of management, so preventing any ecological impact. This area might be seen as a preferential site to perform studies on vegetation dynamics in the absence of major herbivores. De Las Gallinas might also be transformed in an excellent work field for the many undergraduate and graduate thesis of the Superior School of Biology, at the Regional University Center of Bariloche. A synergic association of the City of Bariloche and the University of Comahue should be foreseen. In the short term, a limited program of eradication of the few exotic species occurring at the island should be tackled. Moreover, the activities of underwater swimming should be moved to the Huemul Island, which is clearly more heavily anthropized. Last but not least, an emphatic recommendation is made to keep its present character of protected untouchable area, in order to preserve its present condition and its natural assets. (author)