Sex differences in diving depths and diet of Antarctic Shags at the South Shetland Islands
Sexual differences in maximum diving depths and in the composition of the diet of the Antarctic Shag (Phalacrocorax bransfieldensis) were investigated at Harmony Point, Nelson Island, South Shetland Islands, Antarctica, during the 1995-1996 and 1996-1997 breeding seasons. The mean maximum diving dep...
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ftunibueairesbd:todo:paper_02738570_v72_n1_p22_Casaux 2023-10-29T02:32:28+01:00 Sex differences in diving depths and diet of Antarctic Shags at the South Shetland Islands Casaux, R. Favero, M. Silva, P. Baroni, A. https://hdl.handle.net/20.500.12110/paper_02738570_v72_n1_p22_Casaux Spanish; English spa eng http://hdl.handle.net/20.500.12110/paper_02738570_v72_n1_p22_Casaux info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar JOUR ftunibueairesbd https://doi.org/20.500.12110/paper_02738570_v72_n1_p22_Casaux 2023-10-05T02:00:28Z Sexual differences in maximum diving depths and in the composition of the diet of the Antarctic Shag (Phalacrocorax bransfieldensis) were investigated at Harmony Point, Nelson Island, South Shetland Islands, Antarctica, during the 1995-1996 and 1996-1997 breeding seasons. The mean maximum diving depth estimated by the capillary-tube depth gauge technique was 37.8 m which, when compared with other studies, reflects good food availability in shallow waters around Harmony Point. Females dived significantly deeper than males and also reached the maximum dive depth registered (112.6 m). The analysis of the stomach contents recovered when the individuals with capillary-tubes returned to the nest from foraging trips indicated that males ingested almost exclusively large Notothenia coriiceps specimens, whereas females preyed more intensively on smaller fish. The differences observed suggest that individuals of both sexes partitioned foraging depths and food resources. Journal/Newspaper Antarc* Antarctic Antarctica Nelson Island South Shetland Islands Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
Spanish English |
description |
Sexual differences in maximum diving depths and in the composition of the diet of the Antarctic Shag (Phalacrocorax bransfieldensis) were investigated at Harmony Point, Nelson Island, South Shetland Islands, Antarctica, during the 1995-1996 and 1996-1997 breeding seasons. The mean maximum diving depth estimated by the capillary-tube depth gauge technique was 37.8 m which, when compared with other studies, reflects good food availability in shallow waters around Harmony Point. Females dived significantly deeper than males and also reached the maximum dive depth registered (112.6 m). The analysis of the stomach contents recovered when the individuals with capillary-tubes returned to the nest from foraging trips indicated that males ingested almost exclusively large Notothenia coriiceps specimens, whereas females preyed more intensively on smaller fish. The differences observed suggest that individuals of both sexes partitioned foraging depths and food resources. |
format |
Journal/Newspaper |
author |
Casaux, R. Favero, M. Silva, P. Baroni, A. |
spellingShingle |
Casaux, R. Favero, M. Silva, P. Baroni, A. Sex differences in diving depths and diet of Antarctic Shags at the South Shetland Islands |
author_facet |
Casaux, R. Favero, M. Silva, P. Baroni, A. |
author_sort |
Casaux, R. |
title |
Sex differences in diving depths and diet of Antarctic Shags at the South Shetland Islands |
title_short |
Sex differences in diving depths and diet of Antarctic Shags at the South Shetland Islands |
title_full |
Sex differences in diving depths and diet of Antarctic Shags at the South Shetland Islands |
title_fullStr |
Sex differences in diving depths and diet of Antarctic Shags at the South Shetland Islands |
title_full_unstemmed |
Sex differences in diving depths and diet of Antarctic Shags at the South Shetland Islands |
title_sort |
sex differences in diving depths and diet of antarctic shags at the south shetland islands |
url |
https://hdl.handle.net/20.500.12110/paper_02738570_v72_n1_p22_Casaux |
genre |
Antarc* Antarctic Antarctica Nelson Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctica Nelson Island South Shetland Islands |
op_relation |
http://hdl.handle.net/20.500.12110/paper_02738570_v72_n1_p22_Casaux |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar |
op_doi |
https://doi.org/20.500.12110/paper_02738570_v72_n1_p22_Casaux |
_version_ |
1781053935654535168 |