The diet of the Antarctic Shag during summer at Nelson Island, Antarctica

Analysis of 139 stomach contents of the Antarctic Shag (Phalacrocorax bransfieldensis) collected at Nelson Island, Antarctica, showed that fish were the main component in the diet, followed by octopods, gammarids, euphausiids, and polychaetes. The fish Notothenia coriiceps predominated in frequency...

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Detalles Bibliográficos
Publicado: 1998
Materias:
Antarctic Shag
Antarctica
Diet
Fish
Phalacrocorax bransfieldensis
Prey temporal variation
Sexual variation in foraging
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v100_n1_p112_Favero
http://hdl.handle.net/20.500.12110/paper_00105422_v100_n1_p112_Favero
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00105422_v100_n1_p112_Favero
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spelling paper:paper_00105422_v100_n1_p112_Favero2023-06-08T14:34:30Z The diet of the Antarctic Shag during summer at Nelson Island, Antarctica Antarctic Shag Antarctica Diet Fish Phalacrocorax bransfieldensis Prey temporal variation Sexual variation in foraging Analysis of 139 stomach contents of the Antarctic Shag (Phalacrocorax bransfieldensis) collected at Nelson Island, Antarctica, showed that fish were the main component in the diet, followed by octopods, gammarids, euphausiids, and polychaetes. The fish Notothenia coriiceps predominated in frequency (56%) and in mass (49%), whereas Harpagifer antarcticus was the most important by number (58%). The sizes of N. coriiceps and H. antarcticus taken by males were significantly larger than those caught by females. This dietary difference is probably due to differential prey selection related to shags' sexual dimorphism, temporal prey availability, and/or different foraging depths/areas. Observations at nests showed that females mainly foraged in the morning, whereas males foraged in the evening. No significant differences were observed between the number of daily foraging trips made by males and females, averaging 1.7 during incubation, 2.0 in early chick-rearing, and 4.6 during the late chick-rearing period. The estimated daily food intakes were 321, 315, and 758 g for females, and 421, 582, and 1,288 g for males during incubation, early and late chick-rearing, respectively. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v100_n1_p112_Favero http://hdl.handle.net/20.500.12110/paper_00105422_v100_n1_p112_Favero
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antarctic Shag
Antarctica
Diet
Fish
Phalacrocorax bransfieldensis
Prey temporal variation
Sexual variation in foraging
spellingShingle Antarctic Shag
Antarctica
Diet
Fish
Phalacrocorax bransfieldensis
Prey temporal variation
Sexual variation in foraging
The diet of the Antarctic Shag during summer at Nelson Island, Antarctica
topic_facet Antarctic Shag
Antarctica
Diet
Fish
Phalacrocorax bransfieldensis
Prey temporal variation
Sexual variation in foraging
description Analysis of 139 stomach contents of the Antarctic Shag (Phalacrocorax bransfieldensis) collected at Nelson Island, Antarctica, showed that fish were the main component in the diet, followed by octopods, gammarids, euphausiids, and polychaetes. The fish Notothenia coriiceps predominated in frequency (56%) and in mass (49%), whereas Harpagifer antarcticus was the most important by number (58%). The sizes of N. coriiceps and H. antarcticus taken by males were significantly larger than those caught by females. This dietary difference is probably due to differential prey selection related to shags' sexual dimorphism, temporal prey availability, and/or different foraging depths/areas. Observations at nests showed that females mainly foraged in the morning, whereas males foraged in the evening. No significant differences were observed between the number of daily foraging trips made by males and females, averaging 1.7 during incubation, 2.0 in early chick-rearing, and 4.6 during the late chick-rearing period. The estimated daily food intakes were 321, 315, and 758 g for females, and 421, 582, and 1,288 g for males during incubation, early and late chick-rearing, respectively.
title The diet of the Antarctic Shag during summer at Nelson Island, Antarctica
title_short The diet of the Antarctic Shag during summer at Nelson Island, Antarctica
title_full The diet of the Antarctic Shag during summer at Nelson Island, Antarctica
title_fullStr The diet of the Antarctic Shag during summer at Nelson Island, Antarctica
title_full_unstemmed The diet of the Antarctic Shag during summer at Nelson Island, Antarctica
title_sort diet of the antarctic shag during summer at nelson island, antarctica
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v100_n1_p112_Favero
http://hdl.handle.net/20.500.12110/paper_00105422_v100_n1_p112_Favero
_version_ 1768543543245144064

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