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Abstract:

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.

Registro:

Documento: Artículo
Título:The diet of the Antarctic Shag during summer at Nelson Island, Antarctica
Autor:Favero, M.; Casaux, R.; Silva, P.; Barrera-Oro, E.; Coria, N.
Filiación:Univ. National de Mar del Plata, Fac. de Ciencias Exactas y Naturales, Departamento de Biología, Funes 3250, 7600 Mar del Plata, Argentina
Instituto Antártico Argentino, División Biología, Cerrito 1248, 1010 Buenos Aires, Argentina
CIC-Univ. Nacional de Mar del Plata, Fac. de Ciencias Exactas y Naturales, Departamento de Ciencias Marinas, Funes 3350, 7600 Mar del Plata, Argentina
Idioma: Inglés
Palabras clave:Antarctic Shag; Antarctica; Diet; Fish; Phalacrocorax bransfieldensis; Prey temporal variation; Sexual variation in foraging
Año:1998
Volumen:100
Número:1
Página de inicio:112
Página de fin:118
Título revista:Condor
Título revista abreviado:Condor
ISSN:00105422
CODEN:CNDRA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v100_n1_p112_Favero

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Citas:

---------- APA ----------
Favero, M., Casaux, R., Silva, P., Barrera-Oro, E. & Coria, N. (1998) . The diet of the Antarctic Shag during summer at Nelson Island, Antarctica. Condor, 100(1), 112-118.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v100_n1_p112_Favero [ ]
---------- CHICAGO ----------
Favero, M., Casaux, R., Silva, P., Barrera-Oro, E., Coria, N. "The diet of the Antarctic Shag during summer at Nelson Island, Antarctica" . Condor 100, no. 1 (1998) : 112-118.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v100_n1_p112_Favero [ ]
---------- MLA ----------
Favero, M., Casaux, R., Silva, P., Barrera-Oro, E., Coria, N. "The diet of the Antarctic Shag during summer at Nelson Island, Antarctica" . Condor, vol. 100, no. 1, 1998, pp. 112-118.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v100_n1_p112_Favero [ ]
---------- VANCOUVER ----------
Favero, M., Casaux, R., Silva, P., Barrera-Oro, E., Coria, N. The diet of the Antarctic Shag during summer at Nelson Island, Antarctica. Condor. 1998;100(1):112-118.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v100_n1_p112_Favero [ ]