Digestive efficiency and dry-matter digestibility in Steller sea lions fed herring, pollock, squid, and salmon
Dry-matter digestibility and energy digestive efficiency were measured in six juvenile Steller sea lions (Eumetopias jubatus) fed three diets each consisting of a single species: herring, pollock, and squid. Two of the animals were also fed pink salmon. Dry-matter digestibility (DMD) and digestive e...
Published in: | Canadian Journal of Zoology |
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Online Access: | http://dx.doi.org/10.1139/z99-201 http://www.nrcresearchpress.com/doi/pdf/10.1139/z99-201 |
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crcansciencepubl:10.1139/z99-201 2024-06-23T07:56:13+00:00 Digestive efficiency and dry-matter digestibility in Steller sea lions fed herring, pollock, squid, and salmon Rosen, D AS Trites, A W 2000 http://dx.doi.org/10.1139/z99-201 http://www.nrcresearchpress.com/doi/pdf/10.1139/z99-201 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 78, issue 2, page 234-239 ISSN 0008-4301 1480-3283 journal-article 2000 crcansciencepubl https://doi.org/10.1139/z99-201 2024-06-06T04:11:17Z Dry-matter digestibility and energy digestive efficiency were measured in six juvenile Steller sea lions (Eumetopias jubatus) fed three diets each consisting of a single species: herring, pollock, and squid. Two of the animals were also fed pink salmon. Dry-matter digestibility (DMD) and digestive efficiency (DE) were measured using the energy and manganese concentration in fecal and food samples. DE values were high for all prey species (herring: 95.4 ± 0.7% (mean ± SD), pollock: 93.9 ± 1.4%, salmon: 93.4 ± 0.5%, squid: 90.4 ± 1.3%). Steller sea lions appear to digest prey of high energy density more efficiently than prey of low energy density. DMD values were also high for all prey species (herring: 90.1 ± 1.8%, pollock: 86.5 ± 3.4%, salmon: 87.3% ± 2.6, squid: 90.5 ± 1.2%). The low DMD value for pollock compared with herring and squid was due to the high proportion of bony material in pollock. There was a strong linear relationship between DE and DMD for each prey type, but the terms cannot be used interchangeably. DE measures are more meaningful than DMD in conveying the energetic benefits derived by sea lions from different types of prey. Species-specific measures of the digestible energy obtained from an array of prey items are a necessary component in understanding the bioenergetic consequences of consuming different prey species. Article in Journal/Newspaper Pink salmon Canadian Science Publishing Canadian Journal of Zoology 78 2 234 239 |
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Canadian Science Publishing |
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English |
description |
Dry-matter digestibility and energy digestive efficiency were measured in six juvenile Steller sea lions (Eumetopias jubatus) fed three diets each consisting of a single species: herring, pollock, and squid. Two of the animals were also fed pink salmon. Dry-matter digestibility (DMD) and digestive efficiency (DE) were measured using the energy and manganese concentration in fecal and food samples. DE values were high for all prey species (herring: 95.4 ± 0.7% (mean ± SD), pollock: 93.9 ± 1.4%, salmon: 93.4 ± 0.5%, squid: 90.4 ± 1.3%). Steller sea lions appear to digest prey of high energy density more efficiently than prey of low energy density. DMD values were also high for all prey species (herring: 90.1 ± 1.8%, pollock: 86.5 ± 3.4%, salmon: 87.3% ± 2.6, squid: 90.5 ± 1.2%). The low DMD value for pollock compared with herring and squid was due to the high proportion of bony material in pollock. There was a strong linear relationship between DE and DMD for each prey type, but the terms cannot be used interchangeably. DE measures are more meaningful than DMD in conveying the energetic benefits derived by sea lions from different types of prey. Species-specific measures of the digestible energy obtained from an array of prey items are a necessary component in understanding the bioenergetic consequences of consuming different prey species. |
format |
Article in Journal/Newspaper |
author |
Rosen, D AS Trites, A W |
spellingShingle |
Rosen, D AS Trites, A W Digestive efficiency and dry-matter digestibility in Steller sea lions fed herring, pollock, squid, and salmon |
author_facet |
Rosen, D AS Trites, A W |
author_sort |
Rosen, D AS |
title |
Digestive efficiency and dry-matter digestibility in Steller sea lions fed herring, pollock, squid, and salmon |
title_short |
Digestive efficiency and dry-matter digestibility in Steller sea lions fed herring, pollock, squid, and salmon |
title_full |
Digestive efficiency and dry-matter digestibility in Steller sea lions fed herring, pollock, squid, and salmon |
title_fullStr |
Digestive efficiency and dry-matter digestibility in Steller sea lions fed herring, pollock, squid, and salmon |
title_full_unstemmed |
Digestive efficiency and dry-matter digestibility in Steller sea lions fed herring, pollock, squid, and salmon |
title_sort |
digestive efficiency and dry-matter digestibility in steller sea lions fed herring, pollock, squid, and salmon |
publisher |
Canadian Science Publishing |
publishDate |
2000 |
url |
http://dx.doi.org/10.1139/z99-201 http://www.nrcresearchpress.com/doi/pdf/10.1139/z99-201 |
genre |
Pink salmon |
genre_facet |
Pink salmon |
op_source |
Canadian Journal of Zoology volume 78, issue 2, page 234-239 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z99-201 |
container_title |
Canadian Journal of Zoology |
container_volume |
78 |
container_issue |
2 |
container_start_page |
234 |
op_container_end_page |
239 |
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1802649183545458688 |