69 results on '"Península Valdés"'
Search Results
2. Notas faunísticas y bioecológicas de Península Valdés y Patagonia, XXII. Elenco sistemático de las aves colectadas y observadas en la península de Valdés y litoral marítimo de Chubut (R. Argentina)
- Author
-
Juan Daciuk
- Subjects
Aves ,sistemática ,biología ,ecología ,Península Valdés ,Chubut ,Ecology ,QH540-549.5 ,Zoology ,QL1-991 - Abstract
En este trabajo se entrega un listado de 116 especies y subespecies de aves recolectadas y observadas en la Península Valdés y litoral marítimo de Chubut a Isla Quintano. Varias citas significan una ampliación de sus rangos conocidos. También se remiten datos sobre los hábitats y las nuevas zonas de reproducción. Los sitios principales se muestran en un mapa y algunas fotografías de aves documentan material taxidérmico.
- Published
- 2020
3. Modeling the spatial structure of the endemic mara (Dolichotis patagonum) across modified landscapes
- Author
-
Milagros Antún and Ricardo Baldi
- Subjects
Distribution and abundance ,Dolichotis patagonum ,Natural and anthropic factors ,spatial models ,Patagonia ,Península Valdés ,Medicine ,Biology (General) ,QH301-705.5 - Abstract
Across modified landscapes, anthropic factors can affect habitat selection by animals and consequently their abundance and distribution patterns. The study of the spatial structure of wild populations is crucial to gain knowledge on species’ response to habitat quality, and a key for the design and implementation of conservation actions. This is particularly important for a low-density and widely distributed species such as the mara (Dolichotis patagonum), a large rodent endemic to Argentina across the Monte and Patagonian drylands where extensive sheep ranching predominates. We aimed to assess the spatial variation in the abundance of maras and to identify the natural and anthropic factors influencing the observed patterns in Península Valdés, a representative landscape of Patagonia. We conducted ground surveys during the austral autumn from 2015 to 2017. We built density surface models to account for the variation in mara abundance, and obtained a map of mara density at a resolution of four km2. We estimated an overall density of 0.93 maras.km−2 for the prediction area of 3,476 km2. The location of ranch buildings, indicators of human presence, had a strong positive effect on the abundance of maras, while the significant contribution of the geographic longitude suggested that mara density increases with higher rainfall. Although human presence favored mara abundance, presumably by providing protection against predators, it is likely that the association could bring negative consequences for maras and other species. The use of spatial models allowed us to provide the first estimate of mara abundance at a landscape scale and its spatial variation at a high resolution. Our approach can contribute to the assessment of mara population abundance and the factors shaping its spatial structure elsewhere across the species range, all crucial attributes to identify and prioritize conservation actions.
- Published
- 2019
- Full Text
- View/download PDF
4. Density-dependent changes in the distribution of Southern Right Whales (Eubalaena australis) in the breeding ground Peninsula Valdés
- Author
-
Nicolas Sueyro, Enrique Alberto Crespo, Magdalena Arias, and Mariano Alberto Coscarella
- Subjects
Southern Right Whales ,Density-dependent ,Distribution change ,Peninsula Valdés ,Eubalaena australis ,Medicine ,Biology (General) ,QH301-705.5 - Abstract
Background The Southern Right Whale (Eubalaena australis) population of the South–western Atlantic Ocean is recovering. In the breeding ground of Peninsula Valdés, as a consequence of the population growth, expansion to new areas by some types of groups and a change in the habitat use patterns at the coastal area were recorded. Methods We analysed information gathered from aerial surveys conducted along the coast of Peninsula Valdés in 15 years of effective sampling in a 19-year span. These surveys were divided into four periods (1999–2000; 2004–2007; 2008–2012 and 2013–2016) and estimated the density of whales in a 620 km of coast divided into segments of five km. Results The density of the whales increased to near three whales per km2 (averaged over each period) in the high-density areas. When this mean number was reached, the significant changes in density in the adjacent areas were detected in the following period. These changes were a decrease in density in the high-density areas and an increase of density in the low-density areas. Discussion We propose that a threshold in density elicits a response in habitat use, with the Mother-calf pairs remaining in the area, while the other groups are displaced to new areas.
- Published
- 2018
- Full Text
- View/download PDF
5. Modeling the spatial structure of the endemic mara (Dolichotis patagonum) across modified landscapes.
- Author
-
Antún, Milagros and Baldi, Ricardo
- Subjects
SHEEP farming ,HABITAT selection ,ARTIFICIAL selection of animals ,HABITATS ,SPATIAL variation ,CULTURAL landscapes ,ANIMAL population density - Abstract
Across modified landscapes, anthropic factors can affect habitat selection by animals and consequently their abundance and distribution patterns. The study of the spatial structure of wild populations is crucial to gain knowledge on species' response to habitat quality, and a key for the design and implementation of conservation actions. This is particularly important for a low-density and widely distributed species such as the mara (Dolichotis patagonum), a large rodent endemic to Argentina across the Monte and Patagonian drylands where extensive sheep ranching predominates. We aimed to assess the spatial variation in the abundance of maras and to identify the natural and anthropic factors influencing the observed patterns in Península Valdés, a representative landscape of Patagonia. We conducted ground surveys during the austral autumn from 2015 to 2017. We built density surface models to account for the variation in mara abundance, and obtained a map of mara density at a resolution of four km2. We estimated an overall density of 0.93 maras.km-2 for the prediction area of 3,476 km2. The location of ranch buildings, indicators of human presence, had a strong positive effect on the abundance of maras, while the significant contribution of the geographic longitude suggested that mara density increases with higher rainfall. Although human presence favored mara abundance, presumably by providing protection against predators, it is likely that the association could bring negative consequences for maras and other species. The use of spatial models allowed us to provide the first estimate of mara abundance at a landscape scale and its spatial variation at a high resolution. Our approach can contribute to the assessment of mara population abundance and the factors shaping its spatial structure elsewhere across the species range, all crucial attributes to identify and prioritize conservation actions. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
6. Density-dependent changes in the distribution of Southern Right Whales (Eubalaena australis) in the breeding ground Peninsula Valdés.
- Author
-
Sueyro, Nicolas, Alberto Crespo, Enrique, Arias, Magdalena, and Alberto Coscarella, Mariano
- Subjects
MATING grounds ,WHALES ,PENINSULAS ,POPULATION ,AERIAL surveys - Abstract
Background: The Southern Right Whale (Eubalaena australis) population of the South–western Atlantic Ocean is recovering. In the breeding ground of Peninsula Valdés, as a consequence of the population growth, expansion to new areas by some types of groups and a change in the habitat use patterns at the coastal area were recorded. Methods: We analysed information gathered from aerial surveys conducted along the coast of Peninsula Valdés in 15 years of effective sampling in a 19-year span. These surveys were divided into four periods (1999–2000; 2004–2007; 2008–2012 and 2013–2016) and estimated the density of whales in a 620 km of coast divided into segments of five km. Results: The density of the whales increased to near three whales per km² (averaged over each period) in the high-density areas. When this mean number was reached, the significant changes in density in the adjacent areas were detected in the following period. These changes were a decrease in density in the high-density areas and an increase of density in the low-density areas. Discussion: We propose that a threshold in density elicits a response in habitat use, with the Mother-calf pairs remaining in the area, while the other groups are displaced to new areas. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
7. Primer registro de homing en el peludo, Chaetophractus villosus (Xenarthra: Chlamyphoridae)
- Author
-
Laura Fasola, Jorge Alberto Gallo, Agustín Ayuso, Agustin Manuel Abba, and Juan Reppucci
- Subjects
Ecology ,QL1-991 ,translocación ,Chubut ,Argentina ,Patagonia ,General Earth and Planetary Sciences ,armadillo ,Zoology ,QH540-549.5 ,Península Valdés ,General Environmental Science - Abstract
Se registró por primera vez el comportamiento de homing en Chaetophractus villosus. Se capturaron 33 individuos de C. villosus y se liberaron a diferentes distancias en Península Valdés, Chubut, Argentina. Del total de individuos, el 30 % regresó al punto captura dentro de los 12 días desde la liberación. El tiempo de recaptura aumentó de manera no linear respecto a la distancia, por lo que los puntos de liberación podrían estar fuera de su área de acción. El regreso al sitio de captura posiblemente se debe a que los peludos reconozcan a este sitio como fuente de recursos alimenticios.
- Published
- 2021
8. Turismo y preservación ambiental: el desarrollo turístico de Península Valdés, Provincia del Chubut
- Author
-
Kuper, Diego
- Subjects
Tourism ,Environmental preservation ,Heritage ,Península Valdés ,Patagonia. ,Recreation. Leisure ,GV1-1860 - Abstract
According with academic research and the actors involved, the relationship between tourism an environmental preservation is seen in a positive way. In this relationship, preservated areas are seen previous from the tourist use, and it definition as a preservated area is independent from tourism. Tour-ism and tourism business only take advantage of these previous areas to transform them in tourist attrac-tive. The aim of this paper is to analyze critically the tourist valorization process of Peninsula Valdés. This article inquires the relationship between tourism and environmental preservation, observing that environmental preservation areas aren’t previous and independent from tourism.and independent.
- Published
- 2009
9. Situación ante el COVID- 19 del Área Natural Protegida Península Valdés (Chubut)
- Author
-
Losano, Piedad María
- Subjects
Valdés Peninsula ,Emergencia ,Área Natural Protegida ,COVID-19 ,Reactivación ,Protocolos ,Reactivation ,Reativação ,Protected Natural Area ,Emergência ,Emergency ,Perspectivas ,Protocols ,Península Valdés ,Perspectives - Abstract
Fil: Losano, Piedad María. Universidad Nacional de Rosario; Argentina. Fil: Losano, Piedad María. Universidad Nacional de la Patagonia San Juan Bosco. Facultad de Ciencias Económicas; Argentina. Fil: Losano, Piedad María. Universidad Nacional de la Patagonia San Juan Bosco. Facultad de Ciencias Jurídicas; Argentina. El presente artículo refiere a las medidas implementadas en la provincia del Chubut a partir de la pandemia generada por el Covid 19, desde el punto de vista del sector turístico en general y al Área Natural Protegida Península Valdes (ANPPV), en particular. El mismo consta de dos partes: una, de caracterización del ANPPV y la otra, consiste en un breve informe acerca del impacto del COVID 19. El ANPPV, declarada Patrimonio Mundial por la UNESCO en el año 1999, se encuentra en el sector Noreste de la Provincia del Chubut, sobre el Océano Atlántico. En relación al informe acerca del impacto generado por el Covid 19, éste se compone de cinco ítems: 1.Suspensión de las actividades turísticas, 2.Elaboración de propuestas para la reactivación del sector turístico, 3.Adopción de medidas por el sector público provincial de apoyo al turismo, 4.Formulación de protocolos, 5.Perspectivas del sector privado. (español) This article refers to the measures implemented in the province of Chubut from the pandemic ge nerated by Covid 19, from the point of view of the tourism sector in general and the Valdes Penin sula Protected Natural Area (ANPPV), in particular. It consists of two parts: one, of ANPPV characterization and the other, consists of a brief report on the impact of COVID 19. The ANPPV, declared a World Heritage Site by UNESCO in 1999, is located in the Northeast sector of Chubut Province, on the Atlantic Ocean. In relation to the report on the impact generated by Covid 19, it consists of five items: 1. Suspension of tourist activities, 2. Preparation of proposals for the revival of the tourism sector, 3. Adoption of measures by the provincial public sector to support tourism, 4. Protocol formulation, 5. Private sector perspectives. (ingles) Opresente artigo refere-se às medidas implementadas na província de Chubut a partir da pandemia gerada pelo Covid 19, do ponto de vista do sector turístico em geral e da Área Natural Protegida Pe nínsula Valdes (ANPPV), em particular. O relatório é constituído por duas partes: uma, de caracterização do ANPPV e a outra, consiste num breve relatório sobre o impacto do COVID 19. O ANPPV, declarado Patrimônio Mundial pela UNESCO em 1999, estão no setor Nordeste da Província do Chubut, sobre o Oceano Atlântico. Em relação ao relatório sobre o impacto gerado pelo Covid 19, este se compõe de cinco itens: 1-Suspensão das atividades turísticas. 2-Elaboração de propostas para o relançamento do setor do turismo. 3-Adopção das medidas pelo sector publico provincial de apoio ao turismo. 4-Formulação de protocolos. 5-Perspectivas do sector privado (portugués)
- Published
- 2020
10. Seasonal variation in the physiological and behavioral responses to tourist visitation in Magellanic penguins.
- Author
-
Villanueva, Cecilia, Walker, Brian George, and Bertellotti, Marcelo
- Subjects
- *
MAGELLANIC penguin , *PENGUIN behavior , *SEASONAL physiological variations , *GLUCOCORTICOIDS , *CORTICOSTERONE , *TOURISM & the environment - Abstract
ABSTRACT Penguin colonies are highly visited worldwide. Although several studies have addressed how penguins behaviorally respond to tourist visitation at a point in time, nothing is known about their response across the entire breeding season. Furthermore, behavioral responses are driven by complex physiological processes and the basal physiological state of the individual might affect the way it responds to stimuli. To test the hypothesis that annual changes in corticosterone result from animals having different requirements for expressing (or not) the glucocorticoid-mediated behaviors at different times of the year in the context of tourist visitation, we examined circulating and stress-induced corticosterone in Magellanic penguins ( Spheniscus magellanicus) from non-visited areas from the San Lorenzo colony, Peninsula Valdes, Argentina across the breeding season. We also examined the behavioral responses of penguins to a pedestrian approach in tourist-visited and non-visited areas of the colony across the season. Our results showed that circulating levels of corticosterone did not vary across the season; however, stress-induced corticosterone was lowest during molt. Our behavioral results showed that penguins displayed different behavior responses at varying distances depending on the area (visited or non-visited) and stage in the season. Penguins in the tourist area were more tolerant to a human approach than penguins in the non-tourist area. During settlement and molt, penguins showed higher occurrence of behaviors related to self-survival (such as standing, moving farther into the nest, and fleeing), whereas during incubation and chick rearing, penguins displayed mostly a behavior associated with defense and vigilance (such as alternate head turns). Furthermore, penguins allowed a closer approach during incubation, but elicited a subsequent behavior quicker than in the rest of the stages, suggesting that they would be particularly sensitive in this stage. Overall, our results suggest that corticosterone release across the season is more associated with penguins' survival in an extreme environment than with behavioral regulation. From a conservation perspective, we identified that penguins were more sensitive to human approach during incubation, but also molt should be considered as a vulnerable stage because corticosterone secretion is suppressed. © 2014 The Wildlife Society. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
11. Choosing what is left: the spatial structure of a wild herbivore population within a livestock-dominated landscape
- Author
-
Maria de Los Milagros Antun and Ricardo Baldi
- Subjects
0106 biological sciences ,Conservation Biology ,lcsh:Medicine ,01 natural sciences ,SPATIAL MODELS ,purl.org/becyt/ford/1 [https] ,010104 statistics & probability ,Abundance (ecology) ,Grazing ,Patagonia ,HABITAT SELECTION ,Anthropic factors ,education.field_of_study ,Ecology ,LAMA GUANICOE ,General Neuroscience ,General Medicine ,Habitat selection ,SHEEP RANCHING ,PATAGONIA ,Geography ,Habitat ,Livestock ,WILD AND DOMESTIC UNGULATES ,General Agricultural and Biological Sciences ,ANTHROPIC FACTORS ,CIENCIAS NATURALES Y EXACTAS ,DISTRIBUTION AND ABUNDANCE ,Population ,Wildlife ,010603 evolutionary biology ,General Biochemistry, Genetics and Molecular Biology ,Ciencias Biológicas ,PENÍNSULA VALDÉS ,0101 mathematics ,education ,purl.org/becyt/ford/1.6 [https] ,Herbivore ,Population Biology ,Distribution and abundance ,business.industry ,lcsh:R ,Interspecific competition ,Ecología ,Spatial models ,Península Valdes ,Lama guanicoe ,Sheep ranching ,Wild and domestic ungulates ,business ,Zoology - Abstract
Shrublands and grasslands comprise over 30% of the land surface and are among the most exploited ecosystems for livestock production. Across natural landscapes, the distribution and abundance of wild herbivores are affected by interspecific competition for foraging resources, hunting and the development of infrastructure among other factors. In Argentine Patagonia, the abundance of domestic sheep grazing on native vegetation outnumbers the widely distributed guanaco (Lama guanicoe) and sheep ranching monopolizes the most productive lands. In this work, we aimed to assess the spatial variation in the abundance of guanacos in Península Valdés, a representative landscape of Patagonia, investigating the incidence of natural and human-related factors. We conducted ground surveys during the austral autumn in 2017 totaling 383.4 km along areas with and without sheep ranching. We built density surface models to account for the variation in guanaco abundance and obtained a map of guanaco density at a resolution of 4 km2. We estimated an overall density of 11.71 guanacos.km−2 for a prediction area of 3,196 km2, although the density of guanacos tripled in areas where sheep ranching was terminated(in around 20% of the surface of Península Valdés) compared to areas withsheep. Guanacos were more abundant at lower values of primary productivityand sheep stocking rates and further from inhabited ranch buildings, suggesting competition with sheep and conflict with humans. Although guanacos selected open, grass-dominated habitats across sheep-free sites, fences dividing properties and paddocks played a significant role in the spatial structure of their population in Península Valdés affecting negatively the abundance of guanacos. Our results indicate that actions to improve habitat connectivity for guanacos, favor the coexistence among guanacos and sheep ranching, and promote responsiblehuman activities and attitudes towards wildlife are needed. Fil: Antun, Maria de Los Milagros. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina Fil: Baldi, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
- Published
- 2020
12. Tenebrionid beetle's dataset (Coleoptera, Tenebrionidae) from Peninsula Valdés (Chubut, Argentina).
- Author
-
Cheli, Germán H., Flores, Gustavo E., Román, Nicolás Martínez, Podestá, Darío, Mazzanti, Renato, and Miyashiro, Lidia
- Subjects
- *
TENEBRIONIDAE , *BEETLES , *ARID regions , *GRAZING , *PASTURES , *PROTECTED areas - Abstract
The Natural Protected Area Peninsula Valdés, located in Northeastern Patagonia, is one of the largest conservation units of arid lands in Argentina. Although this area has been in the UNESCO World Heritage List since 1999, it has been continually exposed to sheep grazing and cattle farming for more than a century which have had a negative impact on the local environment. Our aim is to describe the first dataset of tenebrionid beetle species living in Peninsula Valdés and their relationship to sheep grazing. The dataset contains 118 records on 11 species and 198 adult individuals collected. Beetles were collected using pitfall traps in the two major environmental units of Peninsula Valdés, taking into account grazing intensities over a three year time frame from 2005-2007. The Data quality was enhanced following the best practices suggested in the literature during the digitalization and geo-referencing processes. Moreover, identification of specimens and current accurate spelling of scientific names were reviewed. Finally, post-validation processes using DarwinTest software were applied. Specimens have been deposited at Entomological Collection of the Centro Nacional Patagónico (CENPAT-CONICET). The dataset is part of the database of this collection and has been published on the internet through GBIF Integrated Publishing Toolkit (IPT) (http://data.gbif.org/datasets/resource/14669/). Furthermore, it is the first dataset for tenebrionid beetles of arid Patagonia available in GBIF database, and it is the first one based on a previously designed and standardized sampling to assess the interaction between these beetles and grazing in the area. The main purposes of this dataset are to ensure accessibility to data associated with Tenebrionidae specimens from Peninsula Valdés (Chubut, Argentina), also to contribute to GBIF with primary data about Patagonian tenebrionids and finally, to promote the Entomological Collection of Centro Nacional Patagónico (CENPAT- CONICET) and its associated biodiversity data. For these reasons, we believe that this information will certainly be useful for future faunistic, ecological, conservational and biogeographical studies. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
13. Turismo y preservación ambiental: el desarrollo turístico de Península Valdés, Provincia del Chubut
- Author
-
Diego Kuper
- Subjects
turismo ,preservación ambiental ,patrimonio ,península valdés ,patagonia ,Recreation. Leisure ,GV1-1860 - Abstract
La relación entre el turismo y la preservación ambiental es asumida por gran parte de los estudios del tema y actores involucrados como una relación positiva. Las áreas preservadas son conside- radas anteriores a su uso por parte del turismo, al tiempo que su definición como tal es independiente. El turismo y el negocio turístico simplemente aprovecharían las áreas preservadas preexistentes en un lugar transformándolas en atractivo. Este artículo presenta resultados de una investigación realizada con el fin de analizar el proceso de valorización turística de Península Valdés. Se indaga sobre las vinculaciones existentes entre el turismo y la preservación ambiental, observándose que las áreas preservadas no son ni independientes ni preexistentes de su valorización por parte del turismo.
- Published
- 2009
- Full Text
- View/download PDF
14. Tecnología cerámica en la localidad arqueológica San Pablo (Península Valdés, Provincia del Chubut, Argentina)
- Author
-
Schuster, Verónica and Schuster, Verónica
- Abstract
The present work brings new information to the studies already undertaken in the archaeological pottery of the northeast coast of Chubut. Its general objective is to characterize the variability, understand the role and estimate the chronology of this technology among the hunter-gatherer groups that implemented it. The results obtained from the techno-morphological and petrographic study carried out on the ceramic material recovered at the archaeological site of San Pablo in the Valdés Peninsula are presented on this occasion. The grade state of preservation, the particular contexts of some findings, morphological variability of certain specimens as well as the presence of a complete piece, allow progress in the interpretation and discussion of the manufacture and circulation of this technology in the region to circa 900 years ago., El presente trabajo aporta nueva información a los estudios ya emprendidos en la cerámica arqueológica de la costa noreste del Chubut, cuyo objetivo general es caracterizar la variabilidad, comprender el rol y estimar la antigüedad de esta tecnología entre las sociedades cazadoras-recolectoras que la implementaron. En esta oportunidad se presentan los resultados obtenidos del estudio tecno-morfológico y petrográfico efectuado al material cerámico recuperado en la localidad arqueológica San Pablo en la Península de Valdés. El buen estado de preservación, los contextos particulares de algunos hallazgos, la variabilidad morfológica de ciertos ejemplares, así como la presencia de una pieza completa, permiten avanzar en la interpretación y discusión de la manufactura y circulación de esta tecnología en la región hacia circa los 900 años AP.
- Published
- 2019
15. Southern elephant seals north of the Antarctic Polar Front.
- Author
-
Lewis, M., Campagna, C., Marin, M. R., and Fernandez, T.
- Subjects
SOUTHERN elephant seal ,COLONIES (Biology) ,REPRODUCTION ,BIOTIC communities ,POPULATION genetics - Abstract
This paper reports on sightings and dispersion of individual southern elephant seals (Mirounga leonina) along the Atlantic and Pacific coasts of South America based on reports of tagged/marked seals from Patagonia and of animals of unknown origin. From 154 sightings, encompassing at least 354 individuals, we found that individuals dispersed to subequatorial latitudes on both sides of the continent, and to more temperate sites, in the Magellanic region of Tierra del Fuego. Nineteen sites were visited by tagged seals from the established colony of Peninsula Valdés (PV, Argentina). PV and the smaller seal population of the Falklands/Malvinas were regularly connected by adults of both sexes. There were more sightings of males than females. No incipient new breeding colonies were found along the Atlantic coast of South America. Some observations coincided with places where elephant seals had been recorded or exploited in the seventeenth and eighteenth centuries. A shortage of suitable habitat for expansion and proximity to predictable food could act as a stabilizing process preventing colonization of new areas from PV. Dispersion data, coherent with population genetics, support a Patagonian elephant seal stock. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
16. Development of individual recognition of female southern elephant seals, Mirounga leonina, from Punta Norte Península Valdés, applying principal components analysis.
- Author
-
Caiafa, Cesar F., Proto, Araceli N., Vergani, Daniel, and Stanganelli, Zulma
- Subjects
- *
ELEPHANT seals , *PHOCIDAE , *SOUTHERN oscillation , *OCEAN-atmosphere interaction , *ATMOSPHERIC pressure , *ECOLOGY - Abstract
The development of software able to provide individual recognition of southern elephant seals, as a tool to study colonies. This analysis was performed within a framework of studies concerning environmental dispersion produced by the El Niño Southern Oscillation effect in the Southern Ocean Ecosystem. Digital photographs of reproductive female elephant seals were taken at Punta Norte (Península Valdés, Patagonia; 42°05′ S, 63°45′ W) during the 2002 breeding season (August to November). The data set under analysis is composed of 96 elephant seal images for a population of 56 individuals. Identification of specimens was carried out using digital pictures taken with a digital video camera, and processed through the‘ Eigenfaces’ method, which is based on principal components analysis. Special care was taken to control possible variations among images of the same individual, like distance, angle, light intensity, etc. To deal with these variations, an initial alignment procedure is proposed to have all images framed; in addition an initial histogram equalization was used which attenuates any potential variation in light intensity. The software was developed in IDL5.5 language. A complete set of empirical results is displayed showing the potential effectiveness of this technique. Individual recognition and pertinence to different population subsets (harems) tests have been carried out. A principal result of this work is that all 96 elephant seal images (representing 56 individuals) were correctly identified. The Eigenfaces method can be used successfully for identification of elephant seals. With the appropriate preparatory treatment of images, high performance results can be expected. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
17. Annual cycle and inter-annual variation in the haul-out pattern of an increasing southern elephant seal colony.
- Author
-
Lewis, M., Campagna, C., and Zavatti, J.
- Subjects
ELEPHANT seals ,CYCLES ,COLONIES (Biology) - Abstract
The study describes the annual cycle of southern elephant seals for the increasing colony of Peninsula Valdés, and compares it to the haul-out pattern reported for stable or decreasing sub-Antarctic colonies of the species. Data were collected during censuses of the entire colony (nine breeding seasons, two moulting seasons and one autumn--winter haul-out), monthly surveys of coastline and mark-recapture of pups. Pup production during the study period grew from 12 113 to 14 621 animals (1995-2003). Most relevant events of the cycle were similar for all colonies studied, independent of the geographical location, size or population trend. Compared with other locations where southern elephant seals breed and moult, distinct features for Peninsula Valdés were: i) breeding occurs earlier in the spring, and ii) most adult females reproduce and moult in the same colony. The increasing number of animals ashore was correlated with the expansion in pup production. Population trends and stability of demographic events could be related to a consistent physical environment (ocean fronts) during foraging phases of the annual cycle. [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
18. Avistaje de elefantes marinos en Península Valdés, Argentina: Importancia y satisfacción desde la perspectiva de guías de turismo y turistas
- Author
-
González, María Belén, Sapoznikow, Alexandra, and Lewis, Mirtha Noemi
- Subjects
tourism perception ,tourist satisfaction ,southern elephant seals ,turismo de naturaleza ,percepciones en turismo ,satisfacción turística ,elefante marino del sur ,Nature-based tourism ,Peninsula Valdes ,Península Valdés - Abstract
Resumen: El turismo de naturaleza ha tenido gran crecimiento en las últimas décadas. En Península Valdés, Argentina, Patrimonio Natural de la Humanidad, el turismo constituye una de las principales actividades económicas de la región basada en el avistaje de fauna marina. Entre las especies convocantes se encuentra elefante marino del sur (Mirounga leonina) que conforma la única colonia continental de la especie. El presente trabajo evaluó los intereses de dos grupos de actores sociales vinculados con la actividad turística (turistas y guías de turismo) y su percepción acerca del avistaje de elefantes marinos como recurso turístico. Se realizaron entrevistas estructuradas a guías y turistas y un taller de trabajo con guías. Ambos grupos coincidieron en que el avistaje de fauna es el principal motivo de la visita, siendo la ballena la especie que más interés genera, y el elefante marino ocupa un lugar secundario. La experiencia de observar a los elefantes marinos en su hábitat fue satisfactoria en los diferentes sitios de observación, siendo la distancia de observación y la cantidad de animales, factores decisivos en el grado de satisfacción. Por su tamaño, dimorfismo sexual y comportamiento, el elefante marino genera sensaciones de asombro e interés en los turistas y es un recurso importante para los guías durante una excursión regular. Sin embargo, no es suficientemente aprovechado como oportunidad para comunicar problemas de conservación de la especie o del ambiente marino. Los resultados son claves para diseñar futuras estrategias de manejo y planificación del turismo en Península Valdés y áreas adyacentes. Abstract: Nature-based tourism is increasing in recent decades. In Peninsula Valdes, Patagonia Argentina, Natural World Heritage area, the tourism is one of the main economic activities of the region, based on watching marine wildlife. The southern elephant seal (Mirounga leonina) colony in Peninsula Valdes is the only continental in the southern hemisphere. The objectives of this study were to evaluate two bout groups of social actors linked to tourism (tourists and tour guides) the interest and their perception a watching elephant seals. Structured interviews to tour guides and tourists were used and developed a workshop for tour guides. Both groups agreed that watching wildlife is the main goal for the visit, and the southern right whale is the species that generates more interest, whereas the elephant seal is secondary. The experience of watching seals in their habitat was satisfactory in the different observation areas, being observation distance and number of animals, decisive factors in tourist satisfaction. Due to size, sexual dimorphism and behavior that characterizes to elephant seal it generates feelings of wonder and curiosity to the visitors and is an important resource during the guided tour. However, it is not sufficiently exploited as an opportunity to communicate conservation problems of the species or the marine habitat. The results are key tool to designing future management and planning strategies of tourism in Peninsula Valdes and adjacent areas.
- Published
- 2019
19. Species of Contracaecum Parasitizing the Magellanic Penguin Spheniscus magellanicus (Spheniscidae) from the Argentinean Coast
- Author
-
Julia Inés Diaz, Lucas Garbin, and Graciela Teresa Navone
- Subjects
Male ,Contracaeceum spheniscus ,Spheniscidae ,Biología ,Spheniscus magellanicus ,ANISAKIDAE ,030308 mycology & parasitology ,purl.org/becyt/ford/1 [https] ,Contracaecum pelagicum ,Contracaecum mirounga ,0302 clinical medicine ,SIBLING SPECIES ,INTERLABIAL MORPHOLOGY ,Parasite hosting ,Zoología ,Contracaecinae ,Atlantic Ocean ,SPHENISCIDAE ,0303 health sciences ,biology ,CAUDAL PAPILLAE ,Zoología, Ornitología, Entomología, Etología ,Río de la plata ,Female ,CIENCIAS NATURALES Y EXACTAS ,Interlabial morphology ,Anisakidae ,030231 tropical medicine ,Argentina ,Zoology ,Ciencias Biológicas ,03 medical and health sciences ,PENÍNSULA VALDÉS ,Sibling species ,Ascaridoidea ,Animals ,purl.org/becyt/ford/1.6 [https] ,Ecology, Evolution, Behavior and Systematics ,Host (biology) ,Bird Diseases ,biology.organism_classification ,Ascaridida Infections ,Península valdés ,Nematode ,RÍO DE LA PLATA ,Microscopy, Electron, Scanning ,Parasitology ,Caudal papillae ,CONTRACAECINAE - Abstract
Anisakid nematodes have a worldwide distribution and are associated with fishes, birds, and marine mammals from freshwater, brackish, and marine systems. The aims of this work are to report for the first time Contracaecum mirounga parasitizing the Magellanic penguin Spheniscus magellanicus, to report another Contracaecum species in the same host species, and to discuss the validity of Contracaeceum spheniscus. Several dead chicks, juveniles, and adults of S. magellanicus were collected along the Argentinean coast from 2002 to 2009. Nematodes were removed from digestive tracts and studied using both light and scanning electron microscopy. Nematode prevalences were 2.38% for C. mirounga and 12.5% for Contracaecum sp. Contracaecum mirounga was found in 1 penguin from Peninsula Valdes, Chubut. This species is known as a specific parasite of marine mammals such as Pinnipedia, thereby suggesting that this nematode is not as specific as believed. Another species of Contracaecum sp. was found parasitizing 1 penguin from the Rio de la Plata coast. It possessed an unusual interlabial morphology and arrangement of male caudal papillae. Despite the low prevalence, the distinct morphological features are convincing and support the presence of a new Contracaecum species. However, a formal description is not presented because sufficient male specimens are lacking. Finally, C. spheniscus is considered a junior synonym of Contracaecum pelagicum. Future molecular studies might be helpful to determine the real diversity of Contracaecum species parasitizing S. magellanicus considering the number of sibling species recognized among the anisakids., Facultad de Ciencias Naturales y Museo, Centro de Estudios Parasitológicos y de Vectores
- Published
- 2019
20. Watching southern elephant seals in Peninsula Valdes, Argentina: Importance and satisfaction of the tour guide and tourist perspective
- Author
-
Mirtha Noemi Lewis, María Belén González, and Alexandra Sapoznikow
- Subjects
Geografía Económica y Social ,CIENCIAS SOCIALES ,Turismo de naturaleza ,purl.org/becyt/ford/5 [https] ,Elefante marino del sur ,percepciones en turismo ,Ciencias Medioambientales ,General Medicine ,purl.org/becyt/ford/5.7 [https] ,Satisfacción turística ,Península Valdés - Abstract
El turismo de naturaleza ha tenido gran crecimiento en las últimas décadas. En Península Valdés, Argentina, Patrimonio Natural de la Humanidad, el turismo constituye una de las principales actividades económicas de la región basada en el avistaje de fauna marina. Entre las especies convocantes se encuentra el elefante marino del sur (Mirounga leonina) que conforma la única colonia continental de la especie. El presente trabajo evaluó los intereses de dos grupos de actores sociales vinculados con la actividad turística (turistas y guías de turismo) y su percepción acerca del avistaje de elefantes marinos como recurso turístico. Se realizaron entrevistas estructuradas a guías y turistas y un taller de trabajo con guías. Ambos grupos coincidieron en que el avistaje de fauna es el principal motivo de la visita, siendo la ballena la especie que más interés genera, y el elefante marino ocupa un lugar secundario. La experiencia de observar a los elefantes marinos en su hábitat fue satisfactoria en los diferentes sitios de observación, siendo la distancia de observación y la cantidad de animales, factores decisivos en el grado de satisfacción.Por su tamaño, dimorfismo sexual y comportamiento, el elefante marino genera sensaciones de asombro e interés en los turistas y es un recurso importante para los guías durante una excursión regular. Sin embargo, no es suficientemente aprovechado como oportunidad para comunicar problemas de conservación de la especie o del ambiente marino. Los resultados son claves para diseñar futuras estrategias de manejo y planificación del turismo en Península Valdés y áreas adyacentes. Nature-based tourism is growingin the last decades. In Peninsula Valdés, Patagonia Argentina, Natural World Heritage area, the tourism is one of the main economic activities of the regionbased on watching marine wildlife. The southern elephant seal (Mirounga leonina) colony in Península Valdés is the only continental in the southern hemisphere. The objectives of this study were to evaluate fortwo groups of social actors linked to tourism (tourists and tour guides) the interestand perception of watching elephant seals. We used structured interviews to tour guides and tourists and developed a tour-guide workshop. Both groups agreed that watching wildlife is the main goal for the visit, and the southern right whale is the specie that causes moreinterest, while the elephant seal is secondary. The experience of watching seals in their habitat was satisfactory in all enabledobservation sites, and both observation distance and number of animals were decisive factors in tourist satisfaction. The size, sexual dimorphism and behavior that characterize to elephant seal produces surprise and curiosity to the visitors and arean important resource during the guided tour. However, it is not used by the guide as an opportunity to communicate conservation problems of species and themarine habitat. The results are key tool to design future management and planning strategies of tourism in Península Valdés and adjacent areas. Fil: González, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina Fil: Sapoznikow, Alexandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Lewis, Mirtha Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
- Published
- 2019
21. Modeling the spatial structure of the endemic mara ( Dolichotis patagonum ) across modified landscapes
- Author
-
Maria de Los Milagros Antun and Ricardo Baldi
- Subjects
0106 biological sciences ,PENINSULA VALDES ,Conservation Biology ,DISTRIBUTION AND ABUNDANCE ,Species distribution ,Distribution (economics) ,lcsh:Medicine ,NATURAL AND ANTHROPIC FACTORS ,DOLICHOTIS PATAGONUM ,010603 evolutionary biology ,01 natural sciences ,Dolichotis patagonum ,SPATIAL MODELS ,General Biochemistry, Genetics and Molecular Biology ,Predation ,Ciencias Biológicas ,purl.org/becyt/ford/1 [https] ,010104 statistics & probability ,Peninsula ,Abundance (ecology) ,Patagonia ,spatial models ,0101 mathematics ,purl.org/becyt/ford/1.6 [https] ,geography.geographical_feature_category ,biology ,Ecology ,Population Biology ,business.industry ,Distribution and abundance ,General Neuroscience ,lcsh:R ,General Medicine ,biology.organism_classification ,Natural and anthropic factors ,PATAGONIA ,Geography ,Habitat ,Biogeography ,Spatial variability ,General Agricultural and Biological Sciences ,business ,CIENCIAS NATURALES Y EXACTAS ,Península Valdés ,Conservación de la Biodiversidad - Abstract
Across modified landscapes, anthropic factors can affect habitat selection by animalsand consequently their abundance and distribution patterns. The study of thespatial structure of wild populations is crucial to gain knowledge on species? responseto habitat quality, and a key for the design and implementation of conservationactions. This is particularly important for a low-density and widely distributedspecies such as the mara (Dolichotis patagonum), a large rodent endemic toArgentina across the Monte and Patagonian drylands where extensive sheepranching predominates. We aimed to assess the spatial variation in the abundance ofmaras and to identify the natural and anthropic factors influencing the observedpatterns in Península Valdés, a representative landscape of Patagonia. We conductedground surveys during the austral autumn from 2015 to 2017. We built densitysurface models to account for the variation in mara abundance, and obtained a mapof mara density at a resolution of four km2. We estimated an overall density of0.93 maras.km-2for the prediction area of 3,476 km2. The location of ranchbuildings, indicators of human presence, had a strong positive effect on theabundance of maras, while the significant contribution of the geographic longitudesuggested that mara density increases with higher rainfall. Although humanpresence favored mara abundance, presumably by providing protection againstpredators, it is likely that the association could bring negative consequences for marasand other species. The use of spatial models allowed us to provide thefirstestimate of mara abundance at a landscape scale and its spatial variation at ahigh resolution. Our approach can contribute to the assessment of mara populationabundance and the factors shaping its spatial structure elsewhere across the speciesrange, all crucial attributes to identify and prioritize conservation actions Fil: Antun, Maria de Los Milagros. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina Fil: Baldi, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
- Published
- 2019
22. The chemical analysis of the waters. Colonial science, exploration and survival in Valdés Peninsula at the end of the 18th century
- Author
-
Bianchi Villelli, Marcia Eliana
- Subjects
Siglo XVIII ,Escorbuto ,Aguas ,Historia ,Fuerte San José ,Arqueología ,Península Valdés - Abstract
Fil: Bianchi Villelli, Marcia. Universidad Nacional de Rio Negro. Instituto de Investigaciones en Diversidad cultural y Procesos de Cambio; Argentina Fil: Bianchi Villelli, Marcia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina In this work we present a documentary piece related to the Spanish colonization of the Patagonian coast at the end of the 18th Century. It is the report of the chemical analysis of waters, taken in Valdés Peninsula during the installation of San José Fort in 1779. We present the transcription of an unpublished document, followed by the lines of inquiry that come up: the method of water analysis and "translation" of the chemical elements mentioned. We contextualize the discussion in relation with the colonization of the territory and decision making about resources, the modernization of chemistry and its role in public health, specifically the importance of scorbut. This concurrence leads to the notoriety of Valdés Peninsula within the colonial scenery. En este trabajo presentamos una pieza documental relativa a la colonización española de la costa patagónica de fines del siglo XVIII. Es el informe sobre el análisis químico de aguas tomadas en península Valdés, durante la instalación del Fuerte San José en 1779. Se presenta la trascripción del documento inédito, seguido de las líneas de indagación que surgen del mismo: el método de análisis y “traducción” de elementos químicos mencionados. Asimismo, contextualizamos la discusión en relación con la colonización del territorio, la toma de decisiones sobre los recursos, la modernización de la química y su rol en la salud pública, en particular, la importancia del escorbuto. Esta concurrencia lleva a la notoriedad de península Valdés en el escenario colonial.
- Published
- 2018
23. Spatial structure of populations of guanacos, lesser rheas and maras in an arid socio-ecosystem. The influence of habitat and sheep ranching in Península Valdés
- Author
-
Antun, Maria de Los Milagros, Baldi, Ricardo, Bisigato, Alejandro, and Bisigato, Alejandro Jorge
- Subjects
Wild herbivores ,PENINSULA VALDES ,ESTIMACIONES DE ABUNDANCIA ,ABUNDANCE ESTIMATIONS ,DENSITY SURFACE MODELS ,ESTRUCTURA ESPACIAL ,WILD HERVIBORES ,Ciencias Biológicas ,PATAGONIA ,Herbívoros silvestres ,HERBIVOROS SILVESTRES ,MODELOS DE SUPERFICIE DE DENSIDAD ,SPATIAL STRUCTURE ,CIENCIAS NATURALES Y EXACTAS ,Península Valdés ,Conservación de la Biodiversidad - Abstract
Se estudió la estructura espacial de poblaciones de herbívoros silvestres -guanacos, choiques y maras- en Península Valdés (PV), Provincia de Chubut. Se utilizaron modelos que dan cuenta de la variación en la abundancia de las especies estudiadas, evaluando los factores naturales y antrópicos que los afectan, y analizando los patrones de co-ocurrencia y segregación entre los herbívoros silvestres y el ovino doméstico, en el área de estudio.Guanacos, choiques y maras conforman el ensamble de grandes herbívoros nativos de amplia distribución en la Patagonia árida. La estructura espacial de sus poblaciones responde a factores propios de cada especie, las características del hábitat y los procesos ecológicos que afectaron su distribución y abundancia histórica. Hacia fines del siglo XIX, comenzó la introducción de ovinos domésticos en la Patagonia árida, y con ello la producción ganadera. La introducción de millones de cabezas de ganado, pastoreando sobre la vegetación nativa, resultó en un disturbio de gran magnitud para el hábitat y para las poblaciones de herbívoros silvestres. Las características geográficas y ecológicas de PV, así como su importancia para la conservación -es Patrimonio Natural de la Humanidad (UNESCO) con recursos manejados (categoría VI IUCN)- y para la economía regional, la hacen relevante para analizar la estructura espacial del ensamble de herbívoros silvestres, e identificar los factores que la modelan en una matriz de producción ganadera.Se realizaron relevamientos terrestres por línea de marcha a lo largo de más de mil km de iirutas y caminos secundarios en PV, entre marzo y mayo de 2015, 2016 y 2017. Se obtuvieron y definieron variables naturales y antrópicas para el área de estudio. Posteriormente se construyeron Modelos de Superficie de Densidad (MSD) y Modelos Nulos (MN) para evaluar la estructura espacial de cada especie.Se obtuvieron estimaciones de abundancia de guanacos, maras, choiques y ovinos en PV con una resolución de 4 km2. Valores intermedios y altos de NDVI (entre 0,07 y 0,2) -correlato de la productividad primaria- se asociaron con una disminución en las abundancias de guanacos y choiques. Entre las variables antrópicas, la proximidad a viviendas habitadas tuvo un fuerte efecto negativo sobre la abundancia de guanacos y positivo en maras, mientras que la cercanía a los alambrados afectó de forma negativa la abundancia de choiques. El guanaco presentó segregación espacial con el ovino, mientras que la mara mostró un patrón de agregación con el choique.Esta tesis contribuye al conocimiento de los mecanismos y variables que modelan la estructura espacial del ensamble de herbívoros nativos de la Patagonia árida, en un área relevante para la conservación y la economía de la región que depende del turismo atraído por la diversidad biológica y de la actividad ganadera. Al mismo tiempo, implica la incorporación de herramientas metodológicas que permiten un análisis exhaustivo de la variación en abundancia de las especies estudiadas. Los resultados obtenidos mediante la aplicación de MSD y MN, sugieren que es importante incorporar estas herramientas para extender las investigaciones a otras áreas de la región, así como para monitorear respuestas a acciones de manejo y conservación de las poblaciones silvestres. The spatial structure of wild-herbivore populations -guanacos, lesser rheas and maras- was studied in Península Valdés (PV), Chubut Province. Models accounting for the variation in the abundance of the studied species were used to assess the natural and anthropogenic factors involved, and to analyze the co-occurrence and segregation patterns between the wild herbivores and the domestic sheep in the study area. Guanacos, lesser rheas and maras make up the assemblage of large native herbivores widely distributed across the arid Patagonia. The spatial structure of their populations responds both to species-specific factors, habitat characteristics and the ecological processes affecting their distribution and abundance. The domestic sheep was introduced in Patagonia by the end of the 19th century. Within a few decades, millions of sheep were grazing on the native vegetation, resulting in a major disturbance for the habitat and for the populations of wild herbivores. The geographic and ecological characteristics of PV, its importance for conservation -it is a Natural World Heritage Site (UNESCO) with managed resources (category VI IUCN)- and for the regional economy, are all relevant factors at the time to analyze the spatial structure of wild herbivores populations within a matrix of livestock production. Ground line transect surveys were carried out along more than one thousand km of roads and secondary tracks in PV, between March and May of 2015, 2016 and 2017. After both natural and anthropogenic variables were obtained and defined for the study area, Density Surface Models (MSD) and Null Models (MN) were constructed to evaluate the spatial structure of each species. Results of abundance of guanacos, maras, lesser rheas and sheep were obtained for PV at a resolution of 4 km2. Intermediate and high NDVI values (between 0,07 and 0,2) -a correlate of primary productivity- were associated with a decrease in the abundances of guanacos and lesser rheas. Between the anthropic variables, the proximity to ranch buildings had a strong negative effect on guanacos, although positive in the abundance of maras, while the proximity to the nearest fence implied a negative effect on the abundance of lesser rheas. Guanacos showed spatial segregation with sheep, while maras showed a pattern of aggregation with lesser rheas. This thesis contributes to the knowledge of the mechanisms and variables that model the spatial structure of the assemblage of native herbivores in the arid Patagonia, within a site of a high relevance for conservation and for the regional economy that depends on the livestock activity and also on the tourism attracted by biological diversity. Also, this work integrates methodological tools that allow a thorough analysis of the spatial variation in the abundance of the selected species. The results obtained through the application of MSD and MN suggest that it is important to incorporate these tools to extend the research to other areas in the region, and to monitor responses to management and conservation actions of wild populations. Fil: Antun, Maria de Los Milagros. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
- Published
- 2018
24. Small, medium and large-sized: so are the terrestrial mammals
- Author
-
D'agostino, Romina Laura and Udrizar Sauthier, Daniel Edgardo
- Subjects
purl.org/becyt/ford/1 [https] ,PATAGONIA ,PENÍNSULA VALDÉS ,ABUNDANCIA RELATIVA ,CONSERVACIÓN ,purl.org/becyt/ford/1.6 [https] ,MAMÍFEROS NATIVOS - Abstract
En el presente capítulo se dan a conocer las especies de mamíferos terrestres que habitan la Reserva de Vida Silvestre San Pablo de Valdés (RSPV), provincia de Chubut, Argentina, los ambientes que ocupan y su abundancia relativa. Los métodos utilizados fueron: trampeos de micromamíferos, transectas diurnas pedestres, transectas vehiculares nocturnas, trampas de huellas, cámaras trampa y registros ocasionales. En la RSPV y en estancias linderas se registraron 22 especies de mamíferos terrestres nativos. Las especies más comunes fueron la laucha sedosacolilarga (Eligmodontia typus), la mara (Dolichotis patagonum) y el zorro gris (Lycalopex gymnocercus). Solo resta confirmar una especie, el moloso común (Tadarida brasiliensis) de las 23 reportadas para la Península Valdés. Esta situación posiciona a la RSPV como un área importante para la conservación de este grupo de animales en el noreste de la provincia de Chubut. Fil: D'agostino, Romina Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Universidad Nacional de la Patagonia. Facultad de Ciencias Naturales. Sede Puerto Madryn; Argentina Fil: Udrizar Sauthier, Daniel Edgardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Universidad Nacional de la Patagonia. Facultad de Ciencias Naturales. Sede Puerto Madryn; Argentina
- Published
- 2017
25. Comunidad intermareal y aves playeras de Playa Colombo
- Author
-
Bala, Luis Oscar, Hernández, María de Los Angeles, Musmeci, Luciana Raquel, Udrizar Sauthier, Daniel Edgardo, Pazos, Gustavo Enrique, and Arias, Alejandro Manuel
- Subjects
purl.org/becyt/ford/1 [https] ,purl.org/becyt/ford/1.5 [https] ,RESERVA SAN PABLO DE VALDÉS ,PENINSULA VALDÉS ,MONITOREO ,CONSERVACIÓN - Abstract
Esta obra resume los trabajos que reflejan la evolución del área protegida Reserva San Pablo de Valdés, luego de 10 años de la extracción del ganado ovino. Se muestras los resultados de monitoreos que siguieron los procesos naturales de los diferentes comunidades y ambientes de este campo.El capítulo resume la evolución de las poblaciones de aves playeras y la comunidad de invertebrados bentónicos que les sirven de sustento trófico de playa Colombo, costa de la reserva. Fil: Bala, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Diversidad y Evolución Austral; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Academia Nacional de Ciencias de Buenos Aires; Argentina Fil: Hernández, María de Los Angeles. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Musmeci, Luciana Raquel. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Fundacion Patagonia Natural; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
- Published
- 2017
26. Introduction : geographic context, history and management for conservation
- Author
-
Arias, Alejandro M., Pazos, Gustavo Enrique, Udrizar Sauthier, Daniel Edgardo, Udrizar Sauthier, Daniel Edgardo, Pazos, Gustavo Enrique, Arias, Alejandro M., and Podestá, Darío Hector
- Subjects
PLAN DE MANEJO ,VS ,Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente ,GEOGRAPHY ,CRÓNICA DE CREACIÓN ,Ciencias de la Tierra y relacionadas con el Medio Ambiente ,purl.org/becyt/ford/1 [https] ,PENÍNSULA VALDÉS ,purl.org/becyt/ford/1.5 [https] ,MANAGEMENT PLAN ,CHRONICLE OF FOUNDATION ,GEOGRAFÍA ,MONITOREO ,MONITORING ,CIENCIAS NATURALES Y EXACTAS - Abstract
Este capítulo tiene la intención de brindar una introducción al libro. Aquí se reseñan algunas características de la reserva, como su ubicación geográfica, su historia, el proceso de adquisición por parte de la Fundación Vida Silvestre Argentina y su devenir en la actual reserva de vida silvestre que hoy es orgullo de quienes tenemos el privilegio de trabajar en ella. Se culmina con la presentación de la estructura y contenido de los diferentes capítulos que componen esta obra. This chapter is intended to provide an introduction to the book. Here we outline some features of the reserve, such as its geographical location, history, the acquisition process by the Fundación Vida Silvestre Argentina, and how it became the current wildlife reserve that makes those of us who have the privilege of working at it feel proud. It ends with the presentation of the structure and content of the different chapters that make up this book. Fil: Arias, Alejandro M.. Fundacion Vida Silvestre Argentina; Argentina Fil: Pazos, Gustavo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Universidad Nacional de la Patagonia. Facultad de Ciencias Naturales. Sede Puerto Madryn; Argentina Fil: Udrizar Sauthier, Daniel Edgardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Universidad Nacional de la Patagonia. Facultad de Ciencias Naturales. Sede Puerto Madryn; Argentina
- Published
- 2017
27. Land birds: species checklist and ecological aspects
- Author
-
Krapovickas, Santiago, Gatto, Alejandro Javier, Lorenzo, Rafael S., Fernández, Cynthia, Udrizar Sauthier, Daniel Edgardo, Pazos, Gustavo Enrique, Arias, Alejandro M., and Podestá, Darío Hector
- Subjects
purl.org/becyt/ford/1 [https] ,PENINSULA VALDES ,SAN PABLO DE VALDES ,Ciencias Biológicas ,RESERVA DE VIDA SILVESTRE ,purl.org/becyt/ford/1.6 [https] ,CIENCIAS NATURALES Y EXACTAS ,CONSERVACION ,Conservación de la Biodiversidad - Abstract
Muestreamos la avifauna terrestre de la Reserva de Vida Silvestre San Pablo de Valdés mediante “conteos de puntos” periódicos, entre 2009 y 2014, para detectar tendencias en los ensambles asociadas a la exclusión del ganado. Registramos 48 especies, de las cuales 22 son residentes. Observamos 18 migrantes australes del Neotrópico (15 de la estación cálida y tres de la fría). La lista de especies comprende el 30% de las citadas para la Península Valdés. El Canastero Patagónico y el Cacholote Pardo, endemismos del país, se reproducen en el lugar. El Choique (categoría “Amenazado”) y otras cuatro especies que registramos frecuentemente se consideran aves con problemas de conservación en la Argentina. La primavera es la estación con mayor riqueza y diversidad. La densidad de Passeriformes en la primavera fluctuó entre 50 y 100 indiv/km2. La abundancia y la riqueza fueron máximas en la estepa arbustiva-herbácea y mínimas en la estepa herbácea. Observamos primero un aumento y luego una disminución de la abundancia general y la riqueza a lo largo de los años. Sugerimos que esta variación está asociada con cambios en los hábitats provocados primero por la exclusión del ganado y luego por el aumento de la densidad de herbívoros silvestres. We sampled the terrestrial avifauna of Reserva de Vida Silvestre San Pablo de Valdés by means of periodical point-counts, between 2009 and 2014, to detect trends in the assemblages associated with the exclusion of livestock. We recorded 48 species, 22 of which are residents. We observed 18 Neotropical austral migrants (15 corresponding to the warm season and three to the cold season). The list of species includes 30% of those recorded in the Peninsula Valdes. Breeding endemics, Patagonian Canastero and White-throated Cacholote, were found breeding in the area. The Lesser Rhea (nationally “Threatened”) and four other species are considered birds with conservation concerns in Argentina. Spring is the season with the highest species richness and diversity. The density of passerines in spring fluctuated between 50 and 100 indiv/km2. The abundance and richness were highest in the shrub-grass steppe and minimum in the grass steppe. We observed first an increase and then a decline in overall abundance and richness over the years. We suggest that this variation is associated with habitat changes caused first by the exclusion of sheep and then by the increase in density of wild herbivores. Fil: Krapovickas, Santiago. Aves Argentinas; Argentina Fil: Gatto, Alejandro Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina Fil: Lorenzo, Rafael S.. Fundación Vida Silvestre; Argentina Fil: Fernández, Cynthia. Universidad de Vigo; España
- Published
- 2017
28. Terrestrial arthropods. Their rol as environmental indicators
- Author
-
Cheli, German Horacio, Martínez, Fernando Joaquín, Udrizar Sauthier, Daniel Edgardo, Pazos, Gustavo Enrique, and Arias, Alejandro M.
- Subjects
PENINSULA VALDES ,GRAZING ,PASTOREO ,INSECTS ,Zoología, Ornitología, Entomología, Etología ,Ecología ,INSECTOS ,ARACHNIDS ,ENVIRONMENTAL HETEROGENEITY ,purl.org/becyt/ford/1 [https] ,HETEROGENEIDAD AMBIENTAL ,Ciencias Biológicas ,ARACNIDOS ,purl.org/becyt/ford/1.6 [https] ,CIENCIAS NATURALES Y EXACTAS ,Conservación de la Biodiversidad - Abstract
Los artrópodos son esenciales para los ecosistemas áridos. Su principal amenaza es la pérdida de hábitat. Es valioso analizar su dinámica espacial en función de factores ambientales porque permiten predecir cambios en la biodiversidad. Así la Reserva de Vida Silvestre San Pablo de Valdés (RSPV) constituye un sitio único para estudiar cómo los artrópodos interactúan con la heterogeneidad ambiental natural y con el principal disturbio antrópico de la región, el pastoreo ovino. En este trabajo se describe la comunidad de artrópodos en la RSPV y se resalta su importancia como indicadores de cambio ambiental. Utilizando trampas de caída se colectaron más de 30000 artrópodos pertenecientes a 17 órdenes y 61 familias. Se demostró que estos artrópodos son sensibles a los cambios ambientales mediados por la heterogeneidad ambiental natural y por el pastoreo. Los principales indicadores de estos cambios son alteraciones en sus abundancias, riqueza y diversidad, que determinan diferentes ensambles tanto a niveles supraespecífico como de especie. Dada la relevancia que tienen los artrópodos en el funcionamiento ecosistémico, su sensibilidad a cambios en el hábitat y el bajo costo económico de su muestreo, se postula a estos organismos como buenos objetos de conservación, sugiriéndose su inclusión en futuros planes de manejo y monitoreo de Península Valdés Arthropods are essential for arid ecosystems. Due to their habitat fidelity, habitat loss represents their main threat. Therefore, it is valuable to analyze their spatial dynamics in relation to environmental factors because these could predict early changes in biodiversity. In this context, the Reserva de Vida Silvestre San Pablo de Valdés (RSPV) is a unique place to study how arthropods interact with both, the natural environmental heterogeneity and sheep grazing, which is the main anthropogenic disturbance in the region. This chapter describes the arthropod community of RSPV and emphasizes their importance as environmental change indicators. Using pitfall traps, we collected over 30000 arthropods belonging to 17 orders and 61 families. We demonstrated that arthropods in the RSPV are sensitive to habitat changes caused by both natural environmental heterogeneity and grazing. The most important indicators of such changes are variations in abundance, richness and diversity, which determine different assemblages at both specific and supraspecific levels. Given the relevance of arthropods for the functioning of arid ecosystems, their sensitivity to habitat changes and the low sampling costs, we postulate these organisms as good conservation targets in Península Valdés, and suggest their inclusion into future management and monitoring plans within the region. Fil: Cheli, German Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Martínez, Fernando Joaquín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
- Published
- 2017
29. Lesser rheas monitoring
- Author
-
Fernández, Cynthia, Geremias Toscano, Nadia Belén, Marino, Andrea Ivana, Udrizar Sauthier, Daniel Edgardo, Pazos, Gustavo Enrique, and Arias, Alejandro M.
- Subjects
Ciencias Biológicas ,purl.org/becyt/ford/1 [https] ,DENSIDAD ,PENÍNSULA VALDÉS ,DISTRIBUTION ,CONSERVATION ,DISTRIBUCIÓN ,RHEA PENNATA ,ABUNDANCE ,Ecología ,purl.org/becyt/ford/1.6 [https] ,CIENCIAS NATURALES Y EXACTAS ,CONSERVACION - Abstract
Dentro del Área Natural Protegida Península Valdés la ubicación de la Reserva de Vida Silvestre San Pablo de Valdés (RVSSPV) coincide con las zonas de mayor presencia de choiques constituyendo, por lo tanto, un sitio clave para su conservación. La especie está catalogada como amenazada a nivel local y sus poblaciones naturales se encuentran fragmentadas y en disminución. La densidad estimada para la Reserva fue de 0.8 (+-0.18) individuos/Km2 lo cual representa el mayor valor de abundancia para la especie en Península Valdés. La presencia del choique en la RVSSPV no sugiere una relación directa con la disponibilidad forrajera y parece estar principalmente influenciada por un bajo impacto de actividades antropogénicas. Esta información refuerza la importancia del desarrollo de programas de monitoreo continuos para conocer el estado de las poblaciones naturales, identificar los impactos provocados por diversas actividades y establecer las bases de una gestión adecuada para la protección de los hábitats que garanticen su conservación. In Península Valdés (PV), the Reserva de Vida Silvestre San Pablo de Valdés is located within the area of the highest occurrence of lesser rheas (Rhea pennata pennata), constituting a key site for its conservation. The species is listed as threatened in Argentina and their natural populations are fragmented and declining. The monitoring of lesser rheas in the RSPV was started in 2010 in order to obtain basic data that allows knowing the activity of the species in the area and to estimate its abundance. The estimated total density in RSPV for the 2010-2014 monitoring period was 0.8 individuals/km2 (SE: 0.18), which represents the highest value of abundance for the species in PV. The presence of lesser rheas in the RSPV does not suggest a direct relationship with the availability of feeding resources and seems to be mainly influenced by a low impact of anthropogenic activities. This information reinforces the importance of developing continuous monitoring programs to know the condition of natural populations, identify the impacts of different activities, and establish the basis for a proper management for habitat protection to ensure their conservation. Fil: Fernández, Cynthia. Universidad de Vigo; España Fil: Geremias Toscano, Nadia Belén. Universidad Nacional de la Patagonia. Facultad de Ciencias Naturales. Sede Puerto Madryn; Argentina Fil: Marino, Andrea Ivana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
- Published
- 2017
30. Primeros estudios arqueobotánicos en Península de Valdés (Patagonia Argentina): el sitio San Pablo 6
- Author
-
Caruso, Laura Lihue and Gomez Otero, Julieta
- Subjects
Historia y Arqueología ,HUMANIDADES ,purl.org/becyt/ford/6 [https] ,arqueobotánica ,Holoceno tardío final ,cazadores-recolectores ,recursos leñosos ,purl.org/becyt/ford/6.1 [https] ,Historia ,Península Valdés - Abstract
El análisis del material recuperado en el sitio San Pablo 6 representa el inicio de los estudios arqueobotánicos en Península Valdés (prov. Chubut, Argentina) ya que hasta la actualidad no se han llevado a cabo estudios de estas características en esta zona de la Patagonia. En este trabajo se presentan los primeros datos sobre el uso de los recursos leñosos por sociedades cazadoras-recolectoras que habitaron un sector de la costa del Golfo Nuevo de la Península Valdés. Las cuatro especies representadas en el diagrama antracológico de San Pablo 6 -Atriplex lampa, Suaeda divaricata, Chuquiraga avellanedae y Schinus johnstonii- sugieren que la obtención del material leñoso podría haberse dado en formaciones vegetales de tipo estepario, similares a las que actualmente caracterizan el ambiente donde se localiza el sitio. Los resultados alcanzados evidencian un uso heterogéneo y local del material leñoso destinado a la combustión. The analysis of the recovered material of the San Pablo 6 site represents the beginning of the archaeobotanical studies in Península Valdés (Chubut province, Argentina). There has no any other study of these characteristics in Patagonia until now. This paper shows the first data of the use of wood resources by the hunter-gatherer societies that inhabit a coastal fringe of the Golfo Nuevo of Península Valdés. The four species represented in the anthracological diagram of San Pablo 6 -Atriplex lampa, Suaeda divaricata, Chuquiraga avellanedae and Schinus johnstonii- suggest that the woody material obtaining would have develop in steppe formation, similar to those that characterize nowadays the site ́s environment. The results show a heterogeneous and local use of the wood material destined to combustion. Fil: Caruso, Laura Lihue. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Istituto Per La Valorizzazione Del Legno E Delle Specie Arboree; Italia Fil: Gomez Otero, Julieta. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Diversidad y Evolución Austral; Argentina. Universidad Nacional de la Patagonia; Argentina
- Published
- 2016
31. Density-dependent changes in the distribution of Southern Right Whales (Eubalaena australis) in the breeding ground Peninsula Valdés
- Author
-
Mariano Alberto Coscarella, Nicolás Sueyro, Magdalena Arias, and Enrique Alberto Crespo
- Subjects
0106 biological sciences ,Eubalaena australis ,lcsh:Medicine ,Distribution (economics) ,EUBALAENA AUSTRALIS ,010603 evolutionary biology ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,Ciencias Biológicas ,purl.org/becyt/ford/1 [https] ,Peninsula ,PENINSULA VALDÉS ,purl.org/becyt/ford/1.6 [https] ,Southern Right Whales ,DENSITY-DEPENDENT ,geography ,geography.geographical_feature_category ,biology ,business.industry ,010604 marine biology & hydrobiology ,General Neuroscience ,lcsh:R ,Peninsula Valdés ,General Medicine ,Ecología ,biology.organism_classification ,Distribution change ,SOUTHERN RIGHT WHALES ,Oceanography ,Density dependent ,Density-dependent ,General Agricultural and Biological Sciences ,business ,CIENCIAS NATURALES Y EXACTAS ,DISTRIBUTION CHANGE - Abstract
Background: The Southern Right Whale (Eubalaena australis) population of the South–western Atlantic Ocean is recovering. In the breeding ground of Peninsula Valdés, as a consequence of the population growth, expansion to new areas by some types of groups and a change in the habitat use patterns at the coastal area were recorded. Methods: We analysed information gathered from aerial surveys conducted along the coast of Peninsula Valdés in 15 years of effective sampling in a 19-year span. These surveys were divided into four periods (1999–2000; 2004–2007; 2008–2012 and 2013–2016) and estimated the density of whales in a 620 km of coast divided into segments of five km. Results: The density of the whales increased to near three whales per km2 (averaged over each period) in the high-density areas. When this mean number was reached, the significant changes in density in the adjacent areas were detected in the following period. These changes were a decrease in density in the high-density areas and an increase of density in the low-density areas. Discussion: We propose that a threshold in density elicits a response in habitat use, with the Mother-calf pairs remaining in the area, while the other groups are displaced to new areas. Fil: Sueyro, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Arias, Magdalena. Universidad Nacional del Comahue. Instituto de Biología Marina y Pesquera Almirante Storni; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Coscarella, Mariano Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
- Published
- 2018
32. Roadside Raptor surveys in Valdes Peninsula (Patagonia, Argentina)
- Author
-
Pruscini, Fabio, Morelli, Federico, Perna, Paolo, Mazzeo, Roberto, Cavitolo, Paolo, Bertellotti, Marcelo, Catorci, Andrea, and Santolini, Riccardo
- Subjects
Valdes Peninsula ,Rapaces ,Steppe ,Península Valdés ,Species richness ,Riqueza de especies ,Roadside surveys ,Conteos en ruta ,Patagonia ,Raptors ,Estepa - Abstract
La Península Valdés es un área de alto valor natural localizada en la costa atlántica de la Patagonia argentina. El objetivo de este estudio fue realizar un muestreo de las aves rapaces de la península, pues han sido hasta ahora poco investigadas. Se realizaron conteos de aves rapaces en ruta a lo largo de una transecta de 451 km en noviembre de 2012 y abril de 2013. Fueron registradas 95 rapaces diurnas (43 en 2012 y 52 en 2013) pertenecientes a 9 especies. Las especies más detectadas fueron Cathartes aura y Milvago Chimango. Las abundancias registradas fueron menores que las observadas en otros estudios similares realizados en áreas continentales de Patagonia. The Valdes Peninsula is a high-value natural area located on the Atlantic coast of the Argentine Patagonia. This research sought to survey raptor species of the peninsula, which has been little investigated. Roadside raptor surveys were carried out along a 451-km roadside transect in November 2012 and in April 2013. Ninety-five diurnal raptors were observed (43 in 2012 and 52 in 2013) comprising a total of 9 species. The most detected species were Cathartes aura and Milvago chimango. The abundances recorded in our study were lower than those obtained in other similar studies in continental Patagonia.
- Published
- 2016
33. Post-mortem findings in southern right whales Eubalaena australis at Península Valdés, Argentina, 2003-2012
- Author
-
M. Virginia Rago, Victoria J. Rowntree, Andrea D. Chirife, Matías Di Martino, Luciano La Sala, Sarah H. Olson, Ania Tomaszewicz, Marcela Uhart, Nadia Mohamed, Juan Emilio Sala, Denise McAloose, Mariano Sironi, Luciana Musmeci, Luciana M. Pozzi, Tracie A. Seimon, Luis Samartino, Lucas Beltramino, Lucas Bandieri, and Julian Andrejuk
- Subjects
0106 biological sciences ,Aging ,Pathology ,Veterinary medicine ,Eubalaena australis ,NEONATE ,01 natural sciences ,Animal Diseases ,0403 veterinary science ,purl.org/becyt/ford/1 [https] ,HISTOLOGY ,Skin ,education.field_of_study ,ARGENTINA ,biology ,Ballena ,04 agricultural and veterinary sciences ,Eubalaena Australis ,Península Valdés, Chubut ,Cetacean morbillivirus ,PENÍNSULA VALDÉS ,Pneumonia (non-human) ,Meningitis ,SOUTHERN RIGHT WHALE ,CIENCIAS NATURALES Y EXACTAS ,medicine.medical_specialty ,Myocarditis ,Inspección Postmortem ,040301 veterinary sciences ,Otras Ciencias Biológicas ,Population ,Argentina ,Postmortem Examination ,Brucella ,Aquatic Science ,Enfermedades de los Animales ,Communicable Diseases ,CALF ,Ciencias Biológicas ,Fetus ,medicine ,Animals ,education ,purl.org/becyt/ford/1.6 [https] ,Ecology, Evolution, Behavior and Systematics ,Toxins, Biological ,Canine distemper ,010604 marine biology & hydrobiology ,MORTALITY ,Whales ,medicine.disease ,biology.organism_classification ,Wounds and Injuries - Abstract
Between 2003 and 2012, 605 southern right whales (SRW; Eubalaena australis) were found dead along the shores of Península Valdés (PV), Argentina. These deaths included alarmingly high annual losses between 2007 and 2012, a peak number of deaths (116) in 2012, and a significant number of deaths across years in calves-of-the-year (544 of 605 [89.9%]; average = 60.4 yr-1). Post-mortem examination and pathogen testing were performed on 212 whales; 208 (98.1%) were calves-of-the-year and 48.0% of these were newborns or neonates. A known or probable cause of death was established in only a small number (6.6%) of cases. These included ship strike in a juvenile and blunt trauma or lacerations (n = 5), pneumonia (n = 4), myocarditis (n = 2), meningitis (n = 1), or myocarditis and meningitis (n = 1) in calves. Ante-mortem gull parasitism was the most common gross finding. It was associated with systemic disease in a single 1-2 mo old calf. Immunohistochemical labeling for canine distemper virus, Toxoplasma gondii and Brucella spp., and PCR for cetacean morbillivirus (CeMV), influenza A, and apicomplexan protozoa were negative on formalin-fixed, paraffin-embedded lung and brain samples from a subset of whales; PCR for Brucella spp. was positive in a newborn/neonate with pneumonia. Skin samples from whales with gull parasitism were PCR negative for CeMV, poxvirus, and papillomavirus. This is the first long-term study to investigate and summarize notable post-mortem findings in the PV SRW population. Consistent, significant findings within or between years to explain the majority of deaths and those in high-mortality years remain to be identified Inst. de Patobiología Fil: McAloose, DeniseWildlife Conservation Society Zoological Health Program; Estados Unidos. Southern Right Whale Health Monitoring Program; Argentina Fil: Rago, Virginia. Southern Right Whale Health Monitoring Program; Argentina. Wildlife Conservation Society Wildlife Health & Health Policy Program; Estados Unidos Fil: Di Martino, Matías. Southern Right Whale Health Monitoring Program; Argentina. Wildlife Conservation Society Wildlife Health & Health Policy Program; Estados Unidos Fil: Chirife, AndreaSouthern Right Whale Health Monitoring Program; Argentina Fil: Olson, Sarah. Wildlife Conservation Society Wildlife Health & Health Policy Program; Estados Unidos Fil: Beltramino, Lucas. Southern Right Whale Health Monitoring Program; Argentina Fil: Pozzi, Luciana Melina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Southern Right Whale Health Monitoring Program; Argentina. Fundación Patagonia Natural; Argentina Fil: Musmeci, Luciana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Southern Right Whale Health Monitoring Program; Argentina. Fundación Patagonia Natural; Argentina Fil: la Sala, Luciano Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahia Blanca; Argentina. Universidad Nacional del Sur. Departamento de Biologia, Bioquimica y Farmacia. Catedra de Parasitologia Clinica; Argentina Fil: Mohamed, Nadia. Southern Right Whale Health Monitoring Program; Argentina Fil: Sala, Juan Emilio. Southern Right Whale Health Monitoring Program; Argentina Fil: Bandieri, Lucas. Southern Right Whale Health Monitoring Program; Argentina Fil: Andrejuk, Julian. Southern Right Whale Health Monitoring Program; Argentina Fil: Tomaszewicz, Ania. Wildlife Conservation Society Zoological Health Program; Estados Unidos Fil: Tomaszewicz, Ania. Wildlife Conservation Society Zoological Health Program; Estados Unidos Fil: Seimon, Tracie. Wildlife Conservation Society Zoological Health Program; Estados Unidos Fil: Sironi, Mariano. Southern Right Whale Health Monitoring Program; Argentina. Instituto de Conservación de Ballenas; Argentina Fil: Samartino, Luis Ernesto. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Patobiología; Argentina Fil: Rowntree, Victoria. Southern Right Whale Health Monitoring Program; Argentina. University of Utah. Department of Biology; Estados Unidos Fil: Uhart, Marcela M. Southern Right Whale Health Monitoring Program; Argentina. Wildlife Conservation Society Wildlife Health & Health Policy Program; Estados Unidos. University of California. School of Veterinary Medicine. One Health Institute; Argentina
- Published
- 2016
34. Choosing what is left: the spatial structure of a wild herbivore population within a livestock-dominated landscape.
- Author
-
Antún M and Baldi R
- Abstract
Shrublands and grasslands comprise over 30% of the land surface and are among the most exploited ecosystems for livestock production. Across natural landscapes, the distribution and abundance of wild herbivores are affected by interspecific competition for foraging resources, hunting and the development of infrastructure among other factors. In Argentine Patagonia, the abundance of domestic sheep grazing on native vegetation outnumbers the widely distributed guanaco ( Lama guanicoe ) and sheep ranching monopolizes the most productive lands. In this work, we aimed to assess the spatial variation in the abundance of guanacos in Península Valdés, a representative landscape of Patagonia, investigating the incidence of natural and human-related factors. We conducted ground surveys during the austral autumn in 2017 totaling 383.4 km along areas with and without sheep ranching. We built density surface models to account for the variation in guanaco abundance and obtained a map of guanaco density at a resolution of 4 km
2 . We estimated an overall density of 11.71 guanacos.km-2 for a prediction area of 3,196 km2 , although the density of guanacos tripled in areas where sheep ranching was terminated (in around 20% of the surface of Península Valdés) compared to areas with sheep. Guanacos were more abundant at lower values of primary productivity and sheep stocking rates and further from inhabited ranch buildings, suggesting competition with sheep and conflict with humans. Although guanacos selected open, grass-dominated habitats across sheep-free sites, fences dividing properties and paddocks played a significant role in the spatial structure of their population in Península Valdés affecting negatively the abundance of guanacos. Our results indicate that actions to improve habitat connectivity for guanacos, favor the coexistence among guanacos and sheep ranching, and promote responsible human activities and attitudes towards wildlife are needed., Competing Interests: The authors declare that they have no competing interests., (© 2020 Antún and Baldi.)- Published
- 2020
- Full Text
- View/download PDF
35. Characterization of lithic assemblages from Puesto de la Fuente archaeological site (Los Manantiales ranch, Península Valdés, Chubut province)
- Author
-
Alberti, Jimena and Buscaglia, Silvana
- Subjects
Historia y Arqueología ,purl.org/becyt/ford/6 [https] ,Materias primas líticas ,Etnicidad ,Artefactos líticos ,Chubut ,Puesto de La Fuente ,Argentina ,Relaciones Interetnicas ,Peninsula Valdes ,Tecnologia Litica ,Arqueología ,HUMANIDADES ,Holoceno tardío ,Investigación arqueológica ,Arqueología histórica ,Aborígenes ,purl.org/becyt/ford/6.1 [https] ,Relaciones interétnicas ,Tecnología lítica ,Siglo XVIII-Segunda mitad ,Península Valdés - Abstract
Como parte de las investigaciones en Arqueología Histórica relativas al complejo de asentamientos españoles establecidos a fines del siglo XVIII en Península Valdés (Provincia de Chubut), en este trabajo se presentan los resultados del análisis de los conjuntos líticos recuperados en el Puesto de la Fuente (Estancia Los Manantiales, Península Valdés). Dada la coexistencia documentada históricamente entre las poblaciones indígenas y españolas, el objetivo principal de este estudio es caracterizar la muestra, situarla cronológicamente, determinar el tipo de ocupaciones que representa y la posible asociación con el asentamiento hispano. Los resultados obtenidos indicarían la presencia de ocupaciones indígenas de carácter residencial y asignables a momentos tardíos en el área inmediata al sitio Puesto de la Fuente. No obstante, la evidencia material es insuficiente por el momento para establecer una asociación con el asentamiento español desde el punto de vista de las relaciones interétnicas. This paper presents the results of the analysis of lithic artifact assemblages recovered at the Puesto de la Fuente site (Los Manantiales Ranch, Península Valdés) within the framework of current research on the historical archeology of the Spanish settlements established in the late eighteenth century in Península Valdés (Chubut province). Given the late eighteenth century Spanish occupation and the historically documented contact between Indigenous people and Spaniards, the aim of this paper is to evaluate the characteristics of the lithic sample in order to define its chronology, the character of the Indigenous occupations in the area, and their possible association with the Spanish settlement. The results indicate the residential character of the Indigenous occupation, which can be assigned to the mid-late Holocene to Spanish-Indigenous contact period, in the immediate area of Puesto de la Fuente archaeological site. Nevertheless, the material evidence is still insufficient to define the association with the Spanish settlement in terms of interethnic relationships. Fil: Alberti, Jimena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Instituto Multidisciplinario de Historia y Ciencias Humanas; Argentina Fil: Buscaglia, Silvana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Instituto Multidisciplinario de Historia y Ciencias Humanas; Argentina
- Published
- 2015
36. Potentially toxic Pseudo-nitzschia species in plankton and fecal samples of Eubalaena australis from Península Valdés calving ground, Argentina
- Author
-
Mariana Degrati, Valeria Carina D'agostino, Monica Susana Hoffmeyer, Gaston Osvaldo Almandoz, and Viviana Sastre
- Subjects
Eubalaena australis ,Otras Ciencias Biológicas ,Ice calving ,Aquatic Science ,Oceanography ,Ciencias Biológicas ,purl.org/becyt/ford/1 [https] ,chemistry.chemical_compound ,Phytoplankton ,purl.org/becyt/ford/1.6 [https] ,Ecology, Evolution, Behavior and Systematics ,Domoic Acid ,Phycotoxin ,biology ,Ecology ,Domoic acid ,Eubalaena Australis ,Plankton ,biology.organism_classification ,chemistry ,Right Whales ,Right whale ,Pseudo-nitzschia ,CIENCIAS NATURALES Y EXACTAS ,Península Valdés ,Pseudo-Nitzschia Blooms - Abstract
Península Valdés (PV) in Argentina is an important calving ground for the southern right whale Eubalaena australis. However, a high mortality of calves has been observed in the last years, which could be associated with phycotoxin exposure. During a sampling program conducted late in the calving seasons of 2004, 2005 and 2010, potentially toxic species of the genus Pseudo-nitzschia were observed to be an important component of the phytoplankton community and they were also found in fecal samples of two live whales and three stranded whales. In line with this, in the present study Pseudo-nitzschia australis, Pseudo-nitzschia fraudulenta, Pseudo-nitzschia pungens and the complex Pseudo-nitzschia pseudodelicatissima were identified in fecal samples and phytoplankton samples by light and electron microscopy. Although no toxin analysis was carried out in the present study, our findings suggest that E. australis could be exposed to domoic acid in their calving ground. Fil: D'agostino, Valeria Carina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Hoffmeyer, Monica Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina. Universidad Tecnológica Nacional. Facultad Regional Bahía Blanca; Argentina Fil: Almandoz, Gaston Osvaldo. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Sastre, Viviana. Universidad Nacional de la Patagonia ; Argentina Fil: Degrati, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia. Facultad de Ciencias Naturales. Sede Puerto Madryn; Argentina
- Published
- 2015
37. Temporal variation in the diet of the Red Knot (Calidris canutus rufa) in a wetland from Península Valdés, Patagonia Argentina
- Author
-
Musmeci, Luciana Raquel, Hernández, María de Los Angeles, Bala, Luis Oscar, and Scolaro, Jose Alejandro
- Subjects
PENINSULA VALDES ,TRAVISIA OLENS ,DARINA SOLENOIDES ,Ecología ,DIET ,purl.org/becyt/ford/1 [https] ,Ciencias Biológicas ,Red Knot ,CLAMS ,polychaetes ,CALIDRIS CANUTUS RUFA ,purl.org/becyt/ford/1.6 [https] ,CIENCIAS NATURALES Y EXACTAS ,SHOREBIRDS ,Colombo Beach - Abstract
Los Playeros Rojizos en su vuelo al norte se detienen en playas de Península Valdés (Patagonia, Argentina) para alimentarse. Esta espec ie presenta poblaciones r educidas y en disminución, en parte debido a la reducida disponibilidad de pres as en algunos sitios de parada migratoria. Por lo tanto, es necesario conocer aspectos básicos de la ecología trófica en especial la variación a lo largo del tiempo, tanto de la disponibilidad de presas, como de la dieta. Se estudió la dieta del Playero Rojizo en playa Colombo (noreste de golfo Nuevo, Penínsul a Valdés). Se analizaron 292 heces recolectadas en abril de 2002, 2003, 2006 y 2007 donde se buscaron es tructuras claves no digeribles que permitieran reconocer las presas ingeridas. En marzo de todos los años se rea lizaron muestreos de la comunidad de invertebrados bentónicos para conocer la oferta trófica. La almeja Darina solenoides fue la presa más representada que resultó positivamente seleccionada todos los años (índice de Savage). En algunos años los poliquetos Travisia olens también fueron seleccionados positivamente. Otros ítems presa de menor importancia fueron semillas, mitílidos, inse ctos, crustáceos isópodos, anfípodos y ostrácodos, el gasterópodo Buccinanops globulosus y la almeja Tellina petitiana . Los playeros prefirieron comer D. solenoides dentro de un rango de tallas variable dependiendo del año (10–18 mm en el año 2002, 8–22 mm en 2003, 10–20 mm en 2006 y 18–26 mm en 2007). En los años donde el aporte en biomasa por parte de las almejas D. solenoides fue menor los playeros tuvieron una mayor diversidad trófica. La dieta resultó significativamente diferente entre los años pr incipalmente por la diferente ingesta de poliquetos. During their northward migration, Red Knots forage exten- sively in intertidal areas of P enínsula Valdés (Patagonia, Argentina). This species has a small population and declines have been linked to reduced prey availabili ty in migratory stopover sites. Thus, knowing the temporal variation in prey avail ability and diet is essential to understand population dynamics in the Red Knot. We studied temporal variation in the diet of the Red Knot at Colombo Beach ( northeastern Nuevo Gulf, Península Valdés) . To evaluate prey availability, we samp led benthic invertebrates in March every study year. We collected 292 feces during April in 2002, 2003, 2006, and 2007. Prey items were identi- fied by using key hard structures. The clam Darina solenoides was the most common prey positively selected every year (Savage index) , although in some years the polychaete Travisia olens was also selected. Other, less important prey items were seeds, mussels, insects, cr ustaceans, isopods, amphi- pods, ostracods, the snail Buccinanops globulosus , and the clam Tellina petitiana . Red Knots selected clams in variable size ranges depending on the year (10–18 mm in 2002, 8–22 mm in 2003, 10–20 in 2006, and 18–26 mm in 2007 mm). In the years where the contribut ion to biomass by the clam D. sole- noides was lower, knots had a higher trophic diversity. Diet composition varied between years mainly due to differences in the intake of polychaetes. Fil: Musmeci, Luciana Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Fundación Patagonia Natural. Puerto Madryn; Argentina Fil: Hernández, María de Los Angeles. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico.; Argentina. Nacional de la Patagonia San Juan Bosco. Puerto Madryn; Argentina Fil: Bala, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Scolaro, Jose Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico.; Argentina
- Published
- 2015
38. Southern elephant seals north of the Antarctic Polar Front
- Author
-
Mirtha Noemi Lewis, Claudio Campagna, Teresita Fernández, and Maria Rosa Marin
- Subjects
Otras Ciencias Biológicas ,Home range ,Population ,MIGRACIÓN ,Oceanography ,Latitude ,Ciencias Biológicas ,PENÍNSULA VALDÉS ,Peninsula ,Elephant seal ,Temperate climate ,education ,Ecology, Evolution, Behavior and Systematics ,Polar front ,geography ,education.field_of_study ,HOME RANGE ,geography.geographical_feature_category ,biology ,Geology ,biology.organism_classification ,Fishery ,Habitat ,MIROUNGA LEONINA ,CIENCIAS NATURALES Y EXACTAS - Abstract
This paper reports on sightings and dispersion of individual southern elephant seals (Mirounga leonina) along the Atlantic and Pacific coasts of South America based on reports of tagged/marked seals from Patagonia and of animals of unknown origin. From 154 sightings, encompassing at least 354 individuals, we found that individuals dispersed to subequatorial latitudes on both sides of the continent, and to more temperate sites, in the Magellanic region of Tierra del Fuego. Nineteen sites were visited by tagged seals from the established colony of Península Valdés (PV, Argentina). PV and the smaller seal population of the Falklands/Malvinas were regularly connected by adults of both sexes. There were more sightings of males than females. No incipient new breeding colonies were found along the Atlantic coast of South America. Some observations coincided with places where elephant seals had been recorded or exploited in the seventeenth and eighteenth centuries. A shortage of suitable habitat for expansion and proximity to predictable food could act as a stabilizing process preventing colonization of new areas from PV. Dispersion data, coherent with population genetics, support a Patagonian elephant seal stock. Fil: Lewis, Mirtha Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Campagna, Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Wildlife Conservation Society; Estados Unidos Fil: Marin, Maria Rosa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Fernandez, Teresita Josefa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
- Published
- 2006
39. Hidrogeología del sur de Península de Valdés, Chubut, Argentina
- Author
-
Alvarez, María del Pilar, Hernández, Mario Alberto, and Bilmes, Andrés
- Subjects
GEOLOGIA ,Península Valdes ,Formación Puerto Madryn ,Hidrogeología - Abstract
Fil: Alvarez, María del Pilar. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Hernández, Mario Alberto. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Bilmes, Andrés. Centro de Investigaciones Geológicas (CIG). Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina
- Published
- 2014
40. Poblaciones de elefantes marinos de Península Valdés: 2002-2013
- Author
-
Marin, Maria Rosa and Ferrari, Mariano Andrés
- Subjects
Ciencias Biológicas ,PENÍNSULA VALDÉS ,POBLACIÓN ,ELEFANTES MARINOS ,CIENCIAS NATURALES Y EXACTAS ,Conservación de la Biodiversidad - Abstract
El presente artículo es una actualización del originalmente publicado por la revista Ciencia Hoy en julio 2002 y reeditado en un volumen especial en 2014 "Los elefantes marinos de Península Valdés" por Mirtha Noemi Lewis y Claudio Campagna. La Península Valdés es un lugar singular aún en una costa especial como es la patagónica. Presenta varios frentes costeros. Aproximadamente 330 km de los 530 km que conforman el perímetro total de la península, constituyen los límites de tres golfos: al norte el San José y el San Matías (del cual Valdés contribuye sólo con una parte de su contorno). Al sur, el Nuevo. Los 200 km de costa restantes se encuentran expuestos al mar abierto, al Atlántico Sudoccidental. Durante la primavera Austral, la Península Valdés es el escenario de la masiva visita del elefante marino. Se trata de la temporada reproductiva, un evento que por su predictibilidad y constancia convoca a miles de turistas que año tras año disfrutan del conjunto migrante en la costa. Fil: Marin, Maria Rosa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Ferrari, Mariano Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Wildlife Conservation Society; Estados Unidos
- Published
- 2014
41. Los elefantes marinos de Península Valdés
- Author
-
Lewis, Mirtha Noemi and Campagna, Claudio
- Subjects
PENINSULA VALDES ,marine environment ,Ecology ,census ,Argentina ,Ecología ,population number ,VOLUMEN TEMATICO ,PSW ,Ciencias Biológicas ,purl.org/becyt/ford/1 [https] ,PATAGONIA ,breeding ,aerial surveys ,geographical distribution ,ELEFANTES MARINOS DEL SUR ,marine mammals ,purl.org/becyt/ford/1.6 [https] ,Biology ,Valdes Peninsula ,CIENCIAS NATURALES Y EXACTAS ,Mirounga leonina - Abstract
Durante la primavera austral, la Península Valdés (Chubut, Argentina) es el escenario de la masiva visita del elefante marino sudamericano (Otaria flavescens). Se trata de la temporada reproductiva. El recuento año tras año de este conjunto migrante es un trabajo indispensable para conocer la dinámica de la población. Los censos poblacionales terrestres ofrecen un invalorable conocimiento de sus fluctuaciones y migraciones. Se brindan particularidades de la elefantería de Valdés y sus poblaciones, aspectos biológicos relevantes y otras lecturas sugeridas. Reprinted as: pp.186-194 in, Ciencia del Mar. Volumen temático 1, 12/2014; Asociación Ciencia Hoy. ISBN: 978-987-45584-0-4 (Special issue dedicated to 'Marine Sciences: 1988-2014')
- Published
- 2014
42. Los elefantes marinos de península Valdés
- Author
-
Marin, Maria Rosa and Ferrari, Mariano Andrés
- Subjects
purl.org/becyt/ford/1 [https] ,Elefantes Marinos ,Población ,purl.org/becyt/ford/1.6 [https] ,Península Valdés - Abstract
El presente artículo es una actualización del originalmente publicado por la revista Ciencia Hoy en julio 2002 y reeditado en un volumen especial en 2014 "Los elefantes marinos de Península Valdés" por Mirtha Noemi Lewis y Claudio Campagna. La Península Valdés es un lugar singular aún en una costa especial como es la patagónica. Presenta varios frentes costeros. Aproximadamente 330 km de los 530 km que conforman el perímetro total de la península, constituyen los límites de tres golfos: al norte el San José y el San Matías (del cual Valdés contribuye sólo con una parte de su contorno). Al sur, el Nuevo. Los 200 km de costa restantes se encuentran expuestos al mar abierto, al Atlántico Sudoccidental. Durante la primavera Austral, la Península Valdés es el escenario de la masiva visita del elefante marino. Se trata de la temporada reproductiva, un evento que por su predictibilidad y constancia convoca a miles de turistas que año tras año disfrutan del conjunto migrante en la costa. Fil: Marin, Maria Rosa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Ferrari, Mariano Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Wildlife Conservation Society; Estados Unidos
- Published
- 2014
43. Diet of the two-banded plover (charadrius falklandicus) in península valdés, patagonia, Argentina
- Author
-
Musmeci, Luciana Raquel, Bala, Luis Oscar, and Hernández, María de Los Angeles
- Subjects
purl.org/becyt/ford/1 [https] ,Ciencias Biológicas ,CIENCIAS AGRÍCOLAS ,Ciencias Veterinarias ,DIETA ,Zoología, Ornitología, Entomología, Etología ,purl.org/becyt/ford/4.3 [https] ,purl.org/becyt/ford/1.6 [https] ,PENÍNSULA VALDES ,purl.org/becyt/ford/4 [https] ,CIENCIAS NATURALES Y EXACTAS ,CHARADRIUS FALKLANDICUS ,CHORLO DOBLE COLLAR - Abstract
El objetivo de este trabajo fue evaluar la dieta del Chorlito Doble Collar (Charadrius falklandicus) en Playa Colombo (Golfo Nuevo, Península Valdés) y compararla con la registrada previamente en Playa Fracasso (Golfo San José), sitios de características similares distanciados por 21 km. En febrero y marzo de 2003 se colectaron 49 heces y se conservaron individualmente. La reconstrucción de la dieta se realizó mediante el reconocimiento de estructuras clave presentes en las heces. Se identificaron siete ítems presa, siendo los más importantes en orden decreciente el poliqueto Travisia olens, la almeja Darina solenoides y los insectos. Se registraron 1.3 almejas por excremento, de una talla promedio de 10.6 mm y un equivalente en biomasa (expresada como peso seco libre de cenizas) de 6.4 mg. Se estimó la abundancia de invertebrados bentónicos para determinar la oferta trófica. Los chorlitos seleccionaron tallas de almejas de 4?12 mm. La dieta en los dos meses fue similar. En Playa Fracasso la presa más importante es Darina solenoides, seguida por Travisia olens. En comparación con Playa Fracasso, en Playa Colombo los chorlitos ingirieron una menor cantidad de almejas, pero de mayor talla y mayor biomasa. The objective of this study was to evaluate the diet of the Two-banded Plover (Charadrius falklandicus) in Playa Colombo (Golfo Nuevo, Península Valdés), and to compare it with the diet recorded in previous studies in Playa Fracasso (Golfo San José), a site with similar characteristics 21 km away. In February and March 2003, we collected 49 faeces that were conserved individually. The diet was reconstructed based on the identification of key structures present in the faeces. Seven prey items were identified, with the most important components being, in decreasing order, the polychaete Travisia olens, the clam Darina solenoides and insects. We recorded 1.3 clams per sample, with a mean size of 10.6 mm and an equivalent biomass (expressed as ash-free dry weight) of 6.4 mg. We estimated benthic invertebrate abundance in order to measure the trophic offer. Plovers selected clam sizes of 4–12 mm. The diet was similar between months. The most important prey in Playa Fracasso is Darina solenoides, followed by Travisia olens. Plovers eat a lower quantity of clams, but with higher size and biomass, in Playa Colombo than in Playa Fracasso. Fil: Musmeci, Luciana Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagonico; Argentina; Fil: Bala, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagonico; Argentina; Fil: Hernández, María de Los Angeles. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagonico; Argentina
- Published
- 2013
44. Mesozooplankton (Appendicularia and Copepoda) ecology in coastal waters of North Patagonia (42°-46°S): annual cycle and trophic relationships
- Author
-
Spinelli, Mariela Lorena, Capitanio, Fabiana, and Gonçalves, Rodrigo
- Subjects
PENINSULA VALDES ,RADIACION ULTRAVIOLETA ,APENDICULARIAS ,CICLO ESTACIONAL ,SISTEMA FRONTAL ,TROPHIC RELATIONSHIP ,SEASONAL CYCLE ,RELACIONES TROFICAS ,COPEPODOS ,COPEPODS ,FRONTAL SYSTEM ,ULTRAVIOLET RADIATION - Abstract
Se estudió la estructura trófica del mesozooplancton con énfasis en Appendicularia y Copepoda en la región norpatagónica, poniendo atenciónen su variación espacial y estacional. Adicionalmente, se realizaronestudios con especies dominantes en esta zona para evaluar cómo factoresambientales pueden afectar las relaciones tróficas en este ecosistema. Paraello, se analizó experimentalmente el efecto subletal de la radiaciónultravioleta en las tasas de alimentación de copépodos. En todo el cicloestacional dominaron los copépodos y la fracción nanoplanctónica defitoplancton. En verano se destacó una menor diversidad de especies,entre las que dominó Euterpina acutifrons. Asimismo, se observó que la RUV inhibe la alimentación de dicha especie y que en sus estadios larvalesson capaces de realizar foto-reparación. En cuanto a la variación espacial,en el sistema frontal de Península Valdés dominaron las menores tallas delmesozooplancton (‹ 500 μm) (copépodos calanoideos, ciclopoideos, naupliiy apendicularias) y las larvas de Engraulis anchoita en la zona homogénea. La distribución de la Chl-a y la estratificación térmica de la columna deagua fueron los principales factores que influyeron en las diferenciasobservadas en la distribución y composición del mesozooplancton. Laapendicularia Oikopleura dioica, presentó una distribución vertical similarde día y de noche en la zona homogénea, en cambio en la zona detransición se encontraron las mayores tallas e individuos maduros porencima de la termoclina durante la noche. Este trabajo brinda nuevainformación sobre la comunidad mesozooplanctónica que sostiene especiesícticas de alto valor comercial en la zona de estudio. En este sentido, losdatos aportados por esta tesis sobre el efecto de la RUV en la alimentaciónde una especie dominante, plantea un punto de partida para nuestroentendimiento de cómo los factores asociados al cambio global puedenmodificar las relaciones tróficas. The present thesis report studies on the trophic structure ofmesozooplankton focusing on Appendicularia and Copepoda in the North Atlantic Patagonian region, with special attention to its spatial andseasonal variations. Furthermore, it studies the dominant species in thisarea to evaluate how environmental factors can affect trophic relationshipsin this ecosystem. To do so, the sublethal effect of ultraviolet radiation onfeeding rates of copepods, were experimentally examined. Both copepodsand the nanoplanktonic fraction of phytoplankton dominated during thewhole seasonal cycle. Lower diversity of species was found during summer,being Euterpina acutifrons the dominant one. It was also observed that the UV radiation inhibits the feeding of this species and that they are able tophoto-repair in their larval stages. As for the spatial variation in the frontalsystem of Peninsula Valdés, small sizes (‹ 500 μm) such asmesozooplankton (calanoids, ciclopoyds, nauplii and appendicularians)and Engraulis anchoita dominated in the homogeneous area. Thedistributions of Chl-a and the thermal stratification of the water columnwere the main factors influencing the observed differences in thedistribution and composition of mesozooplankton. The appendicularian Oikopleura dioica showed a similar vertical distribution both during dayand night in the homogeneous area, whereas in the transition area largersizes and more mature individuals were found above the thermocline atnight. This work provides new information about the mesozooplanktoncommunity that supports fish species of high commercial value. In thissense, the data provided by this thesis concerning the UVR effect on thefeeding of a dominant species represents a starting point for ourunderstanding of how the factors associated with global change can alterthe trophic relationships in this region. Fil: Spinelli, Mariela Lorena. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
- Published
- 2013
45. Metal Levels in Southern Right Whales (Eubalaena australis) from Península Valdés, Argentina
- Author
-
Sandra S. Wise, Julieta Martino, Mariano Sironi, John Pierce Wise, and Christopher Perkins
- Subjects
0106 biological sciences ,Chromium ,Industrial growth ,Tissue concentrations ,Eubalaena australis ,Population ,Zoology ,010501 environmental sciences ,01 natural sciences ,Article ,Metal ,Peninsula ,Chemical contaminants ,14. Life underwater ,education ,0105 earth and related environmental sciences ,education.field_of_study ,geography ,geography.geographical_feature_category ,biology ,Ecology ,010604 marine biology & hydrobiology ,biology.organism_classification ,Metals ,Barium ,visual_art ,Southern right whale ,visual_art.visual_art_medium ,Península Valdés ,Aluminum - Abstract
Peninsula Valdes, Argentina, is a nursing ground for a population of southern right whales (Eubalaena australis). In the last two decades this area has been subjected to an increase in population, tourism and industrial growth. This has raised the concern for exposure to chemical contaminants such as metals. In this study we measured nonessential metals (Ag, Al, As, Au, Ba, Be, Co, Cd, Cr, Hg, Li, Ni, Pb, Sb, Sn, Sr, U and Ti), essential metals (Cu, Fe, Mg, Mn, Mo and Zn) and an essential element (Se) in skin biopsies from female southern right whales (n=10). This is the first report on tissue concentrations of metals in adult southern right whales. Overall, tissue values were on the low end of the spectrum and similar to the values reported in studies of mysticetes from other regions. Measured values do not reflect substantial amounts of accumulation and thus serve as a baseline.
- Published
- 2013
46. Almejas en golfos norpatagónicos, Argentina: Disponibilidad trófica para aves playeras migratorias
- Author
-
Musmeci, Luciana, Hernández, María, Scolaro, José, and Bala, Luis
- Subjects
distribution ,Tellina petitiana ,distribución ,Darina solenoides ,Peninsula Valdes ,Península Valdés - Abstract
La Península Valdés, Patagonia Argentina, es un área utilizada como escala trófica por diferentes especies de aves playeras. Estas aves se caracterizan por realizar grandes migraciones y dependen, para su supervivencia, de los sitios donde se detienen para reabastecerse. Estudios de dieta de distintas especies de aves playeras indican que las almejas Darina solenoides y Tellina petitiana son presas importantes en su ecología trófica en la Península Valdés, prefiriendo ingerir almejas entre 3 y 18 mm de longitud. El objetivo del presente trabajo fue estimar parámetros poblacionales básicos (distribución espacial, densidad y estructuración por tamaños corporales) de las 2 especies de almejas a fin de evaluarlas como recursos tróficos de las aves playeras. Se realizaron muestreos del bentos por medio de cuadriculados de las zonas intermareales. En cada unidad de la cuadrícula se realizó un muestreo con 3 réplicas en 3 playas de sustratos arenosos: playas Fracasso y Blancas (ubicadas en el golfo San José) y playa Colombo (golfo Nuevo). Cada muestra se recolectó mediante core, fue tamizada in situ y conservada para su análisis en laboratorio donde se identificaron las 2 especies de almejas, se cuantificaron y se midieron las máximas longitudes antero-posteriores. Al comparar las abundancias de almejas registradas en este estudio, con respecto a otros sitios visitados por aves playeras, dichas abundancias de almejas de los intermareales de la Península Valdés serían suficientes como para sustentar las abundancias de aves registradas. La playa Fracasso resultó el sitio con mayor disponibilidad de almejas con tamaños corporales preferibles por dichas aves, seguida por la playa Blancas. Peninsula Valdes, Argentinian Patagonia, is an area used as a trophic stopover by several shorebird species. These shorebirds are characterized by made long migrations and their survival depend for the sites where they stopover to forage. Diet studies indicate that the clams Darina solenoides and Tellina petitiana are key prey in their trophic ecology in Peninsula Valdes, preferring to ingest corporal sizes clams between 3 and 18 mm in length. The objective of this study there was to estimate population parameters (space distribution, density and age-structure) for both species of clams in order to evaluate them as trophic resource for shorebirds. Benthic samples were taken from a grid covering the intertidal area. In each square unit a sampling with 3 replicates at each sandy beach was carried out: Fracasso and Blancas beaches (were located in San Jose Gulf) and Colombo beach (in Nuevo Gulf). Each sample was collected with a core, sieved in situ and conserved for later analysis in the laboratory where both clam species were identified, quantified and measured taking the maximum anteroposterior lengths. Comparing the abundances of clams registered in this study with other stopover sites, these abundances of the intertidal clams of Peninsula Valdes would be sufficient to support the registered shorebirds abundances. Fracasso beach was the site with more suitable clams with preferable corporal sizes for shorebirds followed by Blancas beach.
- Published
- 2013
47. Clams in north-patagonian gulfs, Argentina: Trophic offer for migratory shorebirds
- Author
-
Luciana Raquel Musmeci, María de Los Angeles Hernández, Luis Oscar Bala, and Jose Alejandro Scolaro
- Subjects
geography.geographical_feature_category ,Ecology ,Tellina petitiana ,distribución ,Zoología, Ornitología, Entomología, Etología ,Aquatic Science ,Oceanography ,purl.org/becyt/ford/1 [https] ,Ciencias Biológicas ,PATAGONIA ,Geography ,ALIMENTACIÓN ,Peninsula ,purl.org/becyt/ford/1.6 [https] ,AVES PLAYERAS ,Darina solenoides ,CIENCIAS NATURALES Y EXACTAS ,Trophic level ,Península Valdés - Abstract
Peninsula Valdes, Argentinian Patagonia, is an area used as a trophic stopover by several shorebird species. These shorebirds are characterized by made long migrations and their survival depend for the sites where they stopover to forage. Diet studies indicate that the clams Darina solenoides and Tellina petitiana are key prey in their trophic ecology in Peninsula Valdes, preferring to ingest corporal sizes clams between 3 and 18 mm in length. The objective of this study there was to estimate population parameters (space distribution, density and age-structure) for both species of clams in order to evaluate them as trophic resource for shorebirds. Benthic samples were taken from a grid covering the intertidal area. In each square unit a sampling with 3 replicates at each sandy beach was carried out: Fracasso and Blancas beaches (were located in San Jose Gulf) and Colombo beach (in Nuevo Gulf). Each sample was collected with a core, sieved in situ and conserved for later analysis in the laboratory where both clam species were identified, quantified and measured taking the maximum anteroposterior lengths. Comparing the abundances of clams registered in this study with other stopover sites, these abundances of the intertidal clams of Peninsula Valdes would be sufficient to support the registered shorebirds abundances. Fracasso beach was the site with more suitable clams with preferable corporal sizes for shorebirds followed by Blancas beach. La Península Valdés, Patagonia Argentina, es un área utilizada como escala trófica por diferentes especies de aves playeras. Estas aves se caracterizan por realizar grandes migraciones y dependen, para su supervivencia, de los sitios donde se detienen para reabastecerse. Estudios de dieta de distintas especies de aves playeras indican que las almejas Darina solenoides y Tellina petitiana son presas importantes en su ecología trófica en la Península Valdés, prefiriendo ingerir almejas entre 3 y 18 mm de longitud. El objetivo del presente trabajo fue estimar parámetros poblacionales básicos (distribución espacial, densidad y estructuración por tamaños corporales) de las 2 especies de almejas a fin de evaluarlas como recursos tróficos de las aves playeras. Se realizaron muestreos del bentos por medio de cuadriculados de las zonas intermareales. En cada unidad de la cuadrícula se realizó un muestreo con 3 réplicas en 3 playas de sustratos arenosos: playas Fracasso y Blancas (ubicadas en el golfo San José) y playa Colombo (golfo Nuevo). Cada muestra se recolectó mediante core, fue tamizada in situ y conservada para su análisis en laboratorio donde se identificaron las 2 especies de almejas, se cuantificaron y se midieron las máximas longitudes antero-posteriores. Al comparar las abundancias de almejas registradas en este estudio, con respecto a otros sitios visitados por aves playeras, dichas abundancias de almejas de los intermareales de la Península Valdés serían suficientes como para sustentar las abundancias de aves registradas. La playa Fracasso resultó el sitio con mayor disponibilidad de almejas con tamaños corporales preferibles por dichas aves, seguida por la playa Blancas. Fil: Musmeci, Luciana Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina; Fundación Patagonia Natural; Argentina; Universidad Nacional de la Patagonia; Argentina; Fil: Hernández, María de Los Angeles. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina; Universidad Nacional de la Patagonia; Argentina; Fil: Scolaro, Jose Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina; Universidad Nacional de la Patagonia; Argentina; Fil: Bala, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina; Universidad Nacional de la Patagonia; Argentina
- Published
- 2013
48. Estimación de la recarga en zonas áridas según distintos métodos : área medanosa del Sur de Península Valdés
- Author
-
Alvarez, María del Pilar, Hernández, Mario Alberto, Trovatto, María Marta, and González, Nilda
- Subjects
GEOLOGIA ,Patagonia Extrandina ,Recarga ,Zonas áridas ,Médanos ,Peninsula Valdés - Abstract
Fil: Alvarez, María del Pilar. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Hernández, Mario Alberto. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: Trovatto, María Marta. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina Fil: González, Nilda. Cátedra de Hidrogeología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentina
- Published
- 2013
49. A Tenebrionid beetle’s dataset (Coleoptera, Tenebrionidae) from Peninsula Valdés (Chubut, Argentina)
- Author
-
Renato Mazzanti, Darío Hector Podestá, German Horacio Cheli, Lidia Miyashiro, Nicolás Rafael Martínez Román, and Gustavo E. Flores
- Subjects
STENOSINI ,TENEBRIONIDAE ,DATASET ,purl.org/becyt/ford/1 [https] ,TENEBRIONINAE ,LEPTYNODERES STRANGULATA ,Rhypasma quadricollis ,Peninsula ,lcsh:Zoology ,Emmallodera hirtipes ,Patagonia ,Leptynoderes tuberculata ,lcsh:QL1-991 ,Tenebrioninae ,OPATRINI ,geography.geographical_feature_category ,SCOTOBIINI ,biology ,Ecology ,EPITRAGINI ,Tenebrionidae ,Opatrini ,Zoología, Ornitología, Entomología, Etología ,BLAPSTINUS PUNCTULATUS ,PATAGONIA ,EPITRAGUS SPP ,MITRAGENIUS ARANEIFORMIS ,Scotobiini ,CIENCIAS NATURALES Y EXACTAS ,Epitragini ,NYCTELIA NODOSA ,PENINSULA VALDÉS ,Ecnomoderes bruchi ,Emmallodera hirtipes ,Article ,Ciencias Biológicas ,Epitragus spp ,LEPTYNODERES TUBERCULATA ,Belopini ,LAGRIINAE ,EPIPEDONOTA CRISTALLISATA ,HYLITHUS TENTYROIDES ,Edrotini ,Pimeliinae ,Epipedonota cristallisata ,Leptynoderes strangulata ,purl.org/becyt/ford/1.6 [https] ,Ecology, Evolution, Behavior and Systematics ,Mitragenius araneiformis ,geography ,EDROTINI ,ECNOMODERES BRUCHI ,Stenosini ,DATA PAPER ,Peninsula Valdés ,TENEBRIONID ,biology.organism_classification ,Hylithus tentyroides ,Archaeology ,EMMALLODERA HIRTIPES ,RHYPASMA QUADRICOLLIS ,Lagriinae ,PIMELIINAE ,NYCTELIINI ,BELOPINI ,Animal Science and Zoology ,Blapstinus punctulatus ,Nyctelia nodosa ,Nycteliini ,Hy - Abstract
The Natural Protected Area Peninsula Valdés, located in Northeastern Patagonia, is one of the largest conservation units of arid lands in Argentina. Although this area has been in the UNESCO World Heritage List since 1999, it has been continually exposed to sheep grazing and cattle farming for more than a century which have had a negative impact on the local environment. Our aim is to describe the first dataset of tenebrionid beetle species living in Peninsula Valdés and their relationship to sheep grazing. The dataset contains 118 records on 11 species and 198 adult individuals collected. Beetles were collected using pitfall traps in the two major environmental units of Peninsula Valdés, taking into account grazing intensities over a three year time frame from 2005-2007. The Data quality was enhanced following the best practices suggested in the literature during the digitalization and geo-referencing processes. Moreover, identification of specimens and current accurate spelling of scientific names were reviewed. Finally, post-validation processes using DarwinTest software were applied. Specimens have been deposited at Entomological Collection of the Centro Nacional Patagónico (CENPAT-CONICET). The dataset is part of the database of this collection and has been published on the internet through GBIF Integrated Publishing Toolkit (IPT) (http://data.gbif.org/datasets/resource/14669/). Furthermore, it is the first dataset for tenebrionid beetles of arid Patagonia available in GBIF database, and it is the first one based on a previously designed and standardized sampling to assess the interaction between these beetles and grazing in the area. The main purposes of this dataset are to ensure accessibility to data associated with Tenebrionidae specimens from Peninsula Valdés (Chubut, Argentina), also to contribute to GBIF with primary data about Patagonian tenebrionids and finally, to promote the Entomological Collection of Centro Nacional Patagónico (CENPAT-CONICET) and its associated biodiversity data. For these reasons, we believe that this information will certainly be useful for future faunistic, ecological, conservational and biogeographical studies. Fil: Cheli, German Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina; Fil: Flores, Gustavo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Mendoza. Instituto Argentino de Investigaciones de Zonas Aridas; Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Mendoza. Instituto Argentino de Investigaciones de Zonas Aridas. Laboratorio de Entomología; Argentina; Fil: Martínez Román, Nicolás Rafael. Universidad Nacional de la Patagonia; Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina; Fil: Podestá, Darío Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina; Fil: Mazzanti, Renato. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina; Fil: Miyashiro, Lidia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
- Published
- 2013
50. Buscado en la Península Valdés: historia del huroncito patagónico
- Author
-
Udrizar Sauthier, Daniel Edgardo and Nabte, Marcela Janina
- Subjects
purl.org/becyt/ford/1 [https] ,Ciencias Biológicas ,Lyncodon Patagonicus ,Otras Ciencias Biológicas ,Conservación ,Patagonia ,purl.org/becyt/ford/1.6 [https] ,CIENCIAS NATURALES Y EXACTAS ,Península Valdés - Abstract
El huroncito patagónico (Lyncodon patagonicus) es un carnívoro pequeño (30-35 cm de longitud) de la familia Mustelidae. Esta especie se distribuye desde la provincia de Salta hasta la provincia de Santa Cruz, también en el centro y sur de Chile. Los ambientes en los que se lo puede encontrar son estepas arbustivas secas y zonas de sierras de baja altura. Su pelaje es gris oscuro, tiene la región de la nuca casi enteramente negra. Por arriba de los ojos y hasta llegar a ponerse en contacto con la banda nucal se halla una gran zona blanca que se extiende hacia los lados y llega casi al nacimiento del miembro anterior. La garganta, el pecho, las cuatro patas y el espacio entre las extremidades posteriores son de color negro. Presenta reducción dentaria, totalizando 28 dientes. Es una especie muy poco conocida en cuanto a su historia natural y al estado de sus poblaciones en la naturaleza por lo que su estatus de conservación es "Datos Insuficientes". Es un animal de hábitos crepusculares y nocturnos, se alimenta de pequeños roedores, de aves y de sus huevos. En cautiverio se observó que captura rápidamente a su presa (roedores de campo) y la devora en pocos minutos sin dejar restos. Es depredado por aves rapaces, como el Águila Mora (Geranoaetus melanoleucus) y dado su escaso tamaño no presentaría conflictos con actividades humanas como la ganadería ovina, aunque puede verse afectado por la pérdida de hábitat debido al avance de la frontera agropecuaria. Se ha propuesto que su distribución geográfica se redujo a causa de cambios climáticos o por la actividad antrópica. A partir de los datos brindados en esta nota, es muy probable que la Península Valdés haya sido una de las regiones "abandonadas" por el huroncito patagónico. Fil: Udrizar Sauthier, Daniel Edgardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Nabte, Marcela Janina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
- Published
- 2012
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.