Age-related trophic segregation between breeding adults and immature individuals has been reporte... more Age-related trophic segregation between breeding adults and immature individuals has been reported in seabirds. The use of combined conventional and Stable Isotope Analyses (SIA) to study the diet of seabirds has become very frequent. Unfortunately, information on the trophic ecology of immature seabirds remains scarce because the sampling of tissues to perform SIA is often very limited due to the difficulty to capture these birds. The koilin membrane, which covers the regurgitated pellet casts of many seabirds, could offer an interesting non-intrusive alternative tissue to perform SIA. In this two-year study of the diet of imperial cormorants in southern Patagonia, we 1) compare the diets of breeding and non-breeding birds through conventional pellet analysis; 2) describe the diet of breeding adults and chicks through a combined method of pellet analysis and whole blood SIA; and finally, 3) compare SIA values of breeding adults obtained from blood with those obtained from koilin me...
Cinco medidas morfometricas fueron tomadas en adultos reproductivos anillados en la colonia de ni... more Cinco medidas morfometricas fueron tomadas en adultos reproductivos anillados en la colonia de nidificacion de Cabo Virgenes. Los sexos de las hembras fueron corroborados por dilatacion de la cloaca durante el periodo de postura de los huevos. Utilizando analisis discriminante se determino que variable es mas util para discriminar sexos. Los valores promedio de las variables medidas fueron comparados con los obtenidos por Scolaro (1983) para la colonia de nidificacion de Punta Tombo. Los individuos resultaron ser significativamente mas pequenos que en Punta Tombo, siendo las medidas del pico las que mejor discriminan entre sexos para ambas colonias, pero con diferentes umbrales.
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Trace metals (Cd, Cr, Cu, Fe, Ni, Pb, and Zn) in feathers of Black-browed Albatross attending the Patagonian Shelf Juan Pablo Seco Pon, Ornela Beltrame, Jorge Marcovecchio, Marco Favero, Patricia Gandini
Age-related trophic segregation between breeding adults and immature individuals has been reporte... more Age-related trophic segregation between breeding adults and immature individuals has been reported in seabirds. The use of combined conventional and Stable Isotope Analyses (SIA) to study the diet of seabirds has become very frequent. Unfortunately, information on the trophic ecology of immature seabirds remains scarce because the sampling of tissues to perform SIA is often very limited due to the difficulty to capture these birds. The koilin membrane, which covers the regurgitated pellet casts of many seabirds, could offer an interesting non-intrusive alternative tissue to perform SIA. In this two-year study of the diet of imperial cormorants in southern Patagonia, we 1) compare the diets of breeding and non-breeding birds through conventional pellet analysis; 2) describe the diet of breeding adults and chicks through a combined method of pellet analysis and whole blood SIA; and finally, 3) compare SIA values of breeding adults obtained from blood with those obtained from koilin me...
Cinco medidas morfometricas fueron tomadas en adultos reproductivos anillados en la colonia de ni... more Cinco medidas morfometricas fueron tomadas en adultos reproductivos anillados en la colonia de nidificacion de Cabo Virgenes. Los sexos de las hembras fueron corroborados por dilatacion de la cloaca durante el periodo de postura de los huevos. Utilizando analisis discriminante se determino que variable es mas util para discriminar sexos. Los valores promedio de las variables medidas fueron comparados con los obtenidos por Scolaro (1983) para la colonia de nidificacion de Punta Tombo. Los individuos resultaron ser significativamente mas pequenos que en Punta Tombo, siendo las medidas del pico las que mejor discriminan entre sexos para ambas colonias, pero con diferentes umbrales.
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Trace metals (Cd, Cr, Cu, Fe, Ni, Pb, and Zn) in feathers of Black-browed Albatross attending the Patagonian Shelf Juan Pablo Seco Pon, Ornela Beltrame, Jorge Marcovecchio, Marco Favero, Patricia Gandini
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