Prey selection of subadult male northern fur seals ( Callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season
Abstract During the breeding season northern fur seals ( Callorhinus ursinus ) congregate on the Pribilof Islands in large numbers creating the potential for intraspecific competition. Due to the declining trend in the Pribilof Islands population of fur seals, it is important to understand how prey...
Published in: | Marine Mammal Science |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2011
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1748-7692.2011.00463.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2011.00463.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2011.00463.x |
id |
crwiley:10.1111/j.1748-7692.2011.00463.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1748-7692.2011.00463.x 2023-12-03T10:31:12+01:00 Prey selection of subadult male northern fur seals ( Callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season Call, Katherine A. Ream, Rolf R. 2011 http://dx.doi.org/10.1111/j.1748-7692.2011.00463.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2011.00463.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2011.00463.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 28, issue 1, page 1-15 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2011 crwiley https://doi.org/10.1111/j.1748-7692.2011.00463.x 2023-11-09T13:10:59Z Abstract During the breeding season northern fur seals ( Callorhinus ursinus ) congregate on the Pribilof Islands in large numbers creating the potential for intraspecific competition. Due to the declining trend in the Pribilof Islands population of fur seals, it is important to understand how prey resources are partitioned among the population. Fur seals exhibit a high degree of sexual dimorphism resulting in energetic differences among age and sex classes. Therefore, we hypothesized that subadult male and adult female fur seals would differ in the type and size of prey consumed. We examined the diets of subadult male (age 2–8; mean mass 28–176 kg) and adult female (age ≥ 3 yr; mean mass 13–50 kg) seals on St. Paul Island from 1992 to 2000. Prey remains found in fecal samples were compared using niche overlap indices. There was nearly complete dietary niche overlap between subadult male and adult female fur seals. Walleye pollock ( Theragra chalcogramma ), Pacific salmon ( Oncorhynchus spp.), Pacific herring ( Clupeia pallasi ), and cephalopods were common prey items found in the diets of both groups. We found differences in the size of pollock consumed and that geographic location of sample collection may be important in determining diet differences. Our results indicate high levels of dietary overlap among subadult male and adult female fur seals. Article in Journal/Newspaper Theragra chalcogramma Callorhinus ursinus Wiley Online Library (via Crossref) Pacific Marine Mammal Science 28 1 1 15 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Call, Katherine A. Ream, Rolf R. Prey selection of subadult male northern fur seals ( Callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract During the breeding season northern fur seals ( Callorhinus ursinus ) congregate on the Pribilof Islands in large numbers creating the potential for intraspecific competition. Due to the declining trend in the Pribilof Islands population of fur seals, it is important to understand how prey resources are partitioned among the population. Fur seals exhibit a high degree of sexual dimorphism resulting in energetic differences among age and sex classes. Therefore, we hypothesized that subadult male and adult female fur seals would differ in the type and size of prey consumed. We examined the diets of subadult male (age 2–8; mean mass 28–176 kg) and adult female (age ≥ 3 yr; mean mass 13–50 kg) seals on St. Paul Island from 1992 to 2000. Prey remains found in fecal samples were compared using niche overlap indices. There was nearly complete dietary niche overlap between subadult male and adult female fur seals. Walleye pollock ( Theragra chalcogramma ), Pacific salmon ( Oncorhynchus spp.), Pacific herring ( Clupeia pallasi ), and cephalopods were common prey items found in the diets of both groups. We found differences in the size of pollock consumed and that geographic location of sample collection may be important in determining diet differences. Our results indicate high levels of dietary overlap among subadult male and adult female fur seals. |
format |
Article in Journal/Newspaper |
author |
Call, Katherine A. Ream, Rolf R. |
author_facet |
Call, Katherine A. Ream, Rolf R. |
author_sort |
Call, Katherine A. |
title |
Prey selection of subadult male northern fur seals ( Callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season |
title_short |
Prey selection of subadult male northern fur seals ( Callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season |
title_full |
Prey selection of subadult male northern fur seals ( Callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season |
title_fullStr |
Prey selection of subadult male northern fur seals ( Callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season |
title_full_unstemmed |
Prey selection of subadult male northern fur seals ( Callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season |
title_sort |
prey selection of subadult male northern fur seals ( callorhinus ursinus ) and evidence of dietary niche overlap with adult females during the breeding season |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2011.00463.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2011.00463.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2011.00463.x |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Theragra chalcogramma Callorhinus ursinus |
genre_facet |
Theragra chalcogramma Callorhinus ursinus |
op_source |
Marine Mammal Science volume 28, issue 1, page 1-15 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2011.00463.x |
container_title |
Marine Mammal Science |
container_volume |
28 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
15 |
_version_ |
1784257409414332416 |