Prey composition impacts lipid and protein digestibility in northern fur seals ( Callorhinus ursinus )
Pinnipeds have specific macronutrient (protein, lipid) requirements to satisfy physiological functions, yet little is known about how diet characteristics affect macronutrient digestibility. We measured relative and absolute lipid and protein digestibility in six female northern fur seals (Callorhin...
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crcansciencepubl:10.1139/cjz-2020-0007 2023-12-17T10:28:09+01:00 Prey composition impacts lipid and protein digestibility in northern fur seals ( Callorhinus ursinus ) Diaz Gomez, Mariana Rosen, David A.S. Forster, Ian P. Trites, Andrew W. 2020 http://dx.doi.org/10.1139/cjz-2020-0007 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2020-0007 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2020-0007 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 98, issue 10, page 681-689 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2020 crcansciencepubl https://doi.org/10.1139/cjz-2020-0007 2023-11-19T13:38:46Z Pinnipeds have specific macronutrient (protein, lipid) requirements to satisfy physiological functions, yet little is known about how diet characteristics affect macronutrient digestibility. We measured relative and absolute lipid and protein digestibility in six female northern fur seals (Callorhinus ursinus (Linnaeus, 1758)) fed eight experimental diets composed variously of four prey species (Pacific herring, Clupea pallasii Valenciennes in Cuvier and Valenciennes, 1847; walleye pollock, Gadus chalcogrammus Pallas, 1814 (formerly Theragra chalcogramma (Pallas, 1814)); capelin, Mallotus villosus (Müller, 1776); magister armhook squid, Berryteuthis magister (Berry, 1913)). We quantified how digestibility was affected by proximate composition of the diet (% lipid or % protein), levels of food mass and macronutrient intake, and tested for any potential benefit of multi-species diets. Overall, digestibility of both protein and lipid were high across diets, although macronutrient retention of lipids (96.0%–98.4%) was significantly higher than protein (95.7%–96.7%) for all but the two highest protein diets. Increased levels of protein intake resulted in increased protein retention, but decreased lipid digestibility. There was no evidence that mixed-species diets provide greater macronutrient digestibility over single-species diets. The results suggest that high to moderate lipid diets are more beneficial to northern fur seals because they lead to increased levels of lipid retention without large decreases in protein digestibility. This raises concerns that dietary factors may be contributing to the population declines of northern fur seals in the Bering Sea. Article in Journal/Newspaper Bering Sea Theragra chalcogramma Callorhinus ursinus Canadian Science Publishing (via Crossref) Bering Sea Pacific Canadian Journal of Zoology 98 10 681 689 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Diaz Gomez, Mariana Rosen, David A.S. Forster, Ian P. Trites, Andrew W. Prey composition impacts lipid and protein digestibility in northern fur seals ( Callorhinus ursinus ) |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Pinnipeds have specific macronutrient (protein, lipid) requirements to satisfy physiological functions, yet little is known about how diet characteristics affect macronutrient digestibility. We measured relative and absolute lipid and protein digestibility in six female northern fur seals (Callorhinus ursinus (Linnaeus, 1758)) fed eight experimental diets composed variously of four prey species (Pacific herring, Clupea pallasii Valenciennes in Cuvier and Valenciennes, 1847; walleye pollock, Gadus chalcogrammus Pallas, 1814 (formerly Theragra chalcogramma (Pallas, 1814)); capelin, Mallotus villosus (Müller, 1776); magister armhook squid, Berryteuthis magister (Berry, 1913)). We quantified how digestibility was affected by proximate composition of the diet (% lipid or % protein), levels of food mass and macronutrient intake, and tested for any potential benefit of multi-species diets. Overall, digestibility of both protein and lipid were high across diets, although macronutrient retention of lipids (96.0%–98.4%) was significantly higher than protein (95.7%–96.7%) for all but the two highest protein diets. Increased levels of protein intake resulted in increased protein retention, but decreased lipid digestibility. There was no evidence that mixed-species diets provide greater macronutrient digestibility over single-species diets. The results suggest that high to moderate lipid diets are more beneficial to northern fur seals because they lead to increased levels of lipid retention without large decreases in protein digestibility. This raises concerns that dietary factors may be contributing to the population declines of northern fur seals in the Bering Sea. |
format |
Article in Journal/Newspaper |
author |
Diaz Gomez, Mariana Rosen, David A.S. Forster, Ian P. Trites, Andrew W. |
author_facet |
Diaz Gomez, Mariana Rosen, David A.S. Forster, Ian P. Trites, Andrew W. |
author_sort |
Diaz Gomez, Mariana |
title |
Prey composition impacts lipid and protein digestibility in northern fur seals ( Callorhinus ursinus ) |
title_short |
Prey composition impacts lipid and protein digestibility in northern fur seals ( Callorhinus ursinus ) |
title_full |
Prey composition impacts lipid and protein digestibility in northern fur seals ( Callorhinus ursinus ) |
title_fullStr |
Prey composition impacts lipid and protein digestibility in northern fur seals ( Callorhinus ursinus ) |
title_full_unstemmed |
Prey composition impacts lipid and protein digestibility in northern fur seals ( Callorhinus ursinus ) |
title_sort |
prey composition impacts lipid and protein digestibility in northern fur seals ( callorhinus ursinus ) |
publisher |
Canadian Science Publishing |
publishDate |
2020 |
url |
http://dx.doi.org/10.1139/cjz-2020-0007 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2020-0007 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2020-0007 |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea Theragra chalcogramma Callorhinus ursinus |
genre_facet |
Bering Sea Theragra chalcogramma Callorhinus ursinus |
op_source |
Canadian Journal of Zoology volume 98, issue 10, page 681-689 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjz-2020-0007 |
container_title |
Canadian Journal of Zoology |
container_volume |
98 |
container_issue |
10 |
container_start_page |
681 |
op_container_end_page |
689 |
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1785580188819521536 |