Otolith size and location in digestive tracts of northern fur seals ( Callorhinus ursinus ): Implications for dietary interpretations
Abstract Walleye pollock ( Theragra chalcogramma ) otoliths ( n = 2,706) recovered from stomachs, small intestines, and colons of 43 northern fur seals ( Callorhinus ursinus ) were evaluated for size and wear by location in the digestive tract. Pollock fork length was regressed on otolith length aft...
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crwiley:10.1111/j.1748-7692.2010.00418.x 2023-12-03T10:31:12+01:00 Otolith size and location in digestive tracts of northern fur seals ( Callorhinus ursinus ): Implications for dietary interpretations Sinclair, E. H. York, A. E. Antonelis, G. A. 2010 http://dx.doi.org/10.1111/j.1748-7692.2010.00418.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2010.00418.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2010.00418.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 27, issue 2, page 421-430 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2010 crwiley https://doi.org/10.1111/j.1748-7692.2010.00418.x 2023-11-09T13:33:36Z Abstract Walleye pollock ( Theragra chalcogramma ) otoliths ( n = 2,706) recovered from stomachs, small intestines, and colons of 43 northern fur seals ( Callorhinus ursinus ) were evaluated for size and wear by location in the digestive tract. Pollock fork length was regressed on otolith length after correction for erosion, and age was estimated from the calculated body size. Age‐1+ pollock otoliths (≥6.3‐mm length) were concentrated in stomachs while age‐0 otoliths (≤6.2‐mm length) were concentrated in colons. Less than 10% of otoliths were found in the small intestines. Pollock age decreased with progression along seal gastrointestinal tracts. Otolith quality increased along gastrointestinal tracts in numbers ≥20, which was typical of age‐0 otoliths recovered from colons. Otolith distribution by age and quality along gastrointestinal tracts suggests that small (≤12 cm) schooling prey are consumed in large volume and passed as a bolus rapidly through the digestive tract before significant erosion of bony remains occurs; while larger prey are eaten in smaller volume and subjected to otolith erosion due to longer retention in the stomach. Our results illustrate the importance of multiple sampling strategies to comprehensively represent prey size in pinniped diet. Article in Journal/Newspaper Theragra chalcogramma Callorhinus ursinus Wiley Online Library (via Crossref) Marine Mammal Science 27 2 421 430 |
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 Sinclair, E. H. York, A. E. Antonelis, G. A. Otolith size and location in digestive tracts of northern fur seals ( Callorhinus ursinus ): Implications for dietary interpretations |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract Walleye pollock ( Theragra chalcogramma ) otoliths ( n = 2,706) recovered from stomachs, small intestines, and colons of 43 northern fur seals ( Callorhinus ursinus ) were evaluated for size and wear by location in the digestive tract. Pollock fork length was regressed on otolith length after correction for erosion, and age was estimated from the calculated body size. Age‐1+ pollock otoliths (≥6.3‐mm length) were concentrated in stomachs while age‐0 otoliths (≤6.2‐mm length) were concentrated in colons. Less than 10% of otoliths were found in the small intestines. Pollock age decreased with progression along seal gastrointestinal tracts. Otolith quality increased along gastrointestinal tracts in numbers ≥20, which was typical of age‐0 otoliths recovered from colons. Otolith distribution by age and quality along gastrointestinal tracts suggests that small (≤12 cm) schooling prey are consumed in large volume and passed as a bolus rapidly through the digestive tract before significant erosion of bony remains occurs; while larger prey are eaten in smaller volume and subjected to otolith erosion due to longer retention in the stomach. Our results illustrate the importance of multiple sampling strategies to comprehensively represent prey size in pinniped diet. |
format |
Article in Journal/Newspaper |
author |
Sinclair, E. H. York, A. E. Antonelis, G. A. |
author_facet |
Sinclair, E. H. York, A. E. Antonelis, G. A. |
author_sort |
Sinclair, E. H. |
title |
Otolith size and location in digestive tracts of northern fur seals ( Callorhinus ursinus ): Implications for dietary interpretations |
title_short |
Otolith size and location in digestive tracts of northern fur seals ( Callorhinus ursinus ): Implications for dietary interpretations |
title_full |
Otolith size and location in digestive tracts of northern fur seals ( Callorhinus ursinus ): Implications for dietary interpretations |
title_fullStr |
Otolith size and location in digestive tracts of northern fur seals ( Callorhinus ursinus ): Implications for dietary interpretations |
title_full_unstemmed |
Otolith size and location in digestive tracts of northern fur seals ( Callorhinus ursinus ): Implications for dietary interpretations |
title_sort |
otolith size and location in digestive tracts of northern fur seals ( callorhinus ursinus ): implications for dietary interpretations |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2010.00418.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2010.00418.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2010.00418.x |
genre |
Theragra chalcogramma Callorhinus ursinus |
genre_facet |
Theragra chalcogramma Callorhinus ursinus |
op_source |
Marine Mammal Science volume 27, issue 2, page 421-430 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2010.00418.x |
container_title |
Marine Mammal Science |
container_volume |
27 |
container_issue |
2 |
container_start_page |
421 |
op_container_end_page |
430 |
_version_ |
1784257407392677888 |