No Evidence of Metabolic Depression in Western Alaskan Juvenile Steller Sea Lions (Eumetopias jubatus)
Steller sea lion (Eumetopias jubatus) populations have undergone precipitous declines through their western Alaskan range over the last four decades with the leading hypothesis to explain this decline centering around changing prey quality, quantity, or availability for this species (i.e., nutrition...
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ftpubmed:oai:pubmedcentral.nih.gov:3887069 2023-05-15T13:14:45+02:00 No Evidence of Metabolic Depression in Western Alaskan Juvenile Steller Sea Lions (Eumetopias jubatus) Hoopes, Lisa A. Rea, Lorrie D. Christ, Aaron Worthy, Graham A. J. 2014-01-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3887069 https://doi.org/10.1371/journal.pone.0085339 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3887069 http://dx.doi.org/10.1371/journal.pone.0085339 http://creativecommons.org/publicdomain/zero/1.0/ This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 (http://creativecommons.org/publicdomain/zero/1.0/) public domain dedication. CC0 PDM Research Article Text 2014 ftpubmed https://doi.org/10.1371/journal.pone.0085339 2014-01-12T01:57:11Z Steller sea lion (Eumetopias jubatus) populations have undergone precipitous declines through their western Alaskan range over the last four decades with the leading hypothesis to explain this decline centering around changing prey quality, quantity, or availability for this species (i.e., nutritional stress hypothesis). Under chronic conditions of reduced food intake sea lions would conserve energy by limiting energy expenditures through lowering of metabolic rate known as metabolic depression. To examine the potential for nutritional stress, resting metabolic rate (RMR) and body composition were measured in free-ranging juvenile Steller sea lions (N = 91) at three distinct geographical locations (Southeast Alaska, Prince William Sound, Central Aleutian Islands) using open-flow respirometry and deuterium isotope dilution, respectively. Average sea lion RMR ranged from 6.7 to 36.2 MJ d−1 and was influenced by body mass, total body lipid, and to a lesser extent, ambient air temperature and age. Sea lion pups captured in the Aleutian Islands (region of decline) had significantly greater body mass and total body lipid stores when compared to pups from Prince William Sound (region of decline) and Southeast Alaska (stable region). Along with evidence of robust body condition in Aleutian Island pups, no definitive differences were detected in RMR between sea lions sampled between eastern and western populations that could not be accounted for by higher percent total body lipid content, suggesting that that at the time of this study, Steller sea lions were not experiencing metabolic depression in the locations studied. Text Aleutian Island Alaska Aleutian Islands PubMed Central (PMC) PLoS ONE 9 1 e85339 |
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Research Article Hoopes, Lisa A. Rea, Lorrie D. Christ, Aaron Worthy, Graham A. J. No Evidence of Metabolic Depression in Western Alaskan Juvenile Steller Sea Lions (Eumetopias jubatus) |
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Research Article |
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Steller sea lion (Eumetopias jubatus) populations have undergone precipitous declines through their western Alaskan range over the last four decades with the leading hypothesis to explain this decline centering around changing prey quality, quantity, or availability for this species (i.e., nutritional stress hypothesis). Under chronic conditions of reduced food intake sea lions would conserve energy by limiting energy expenditures through lowering of metabolic rate known as metabolic depression. To examine the potential for nutritional stress, resting metabolic rate (RMR) and body composition were measured in free-ranging juvenile Steller sea lions (N = 91) at three distinct geographical locations (Southeast Alaska, Prince William Sound, Central Aleutian Islands) using open-flow respirometry and deuterium isotope dilution, respectively. Average sea lion RMR ranged from 6.7 to 36.2 MJ d−1 and was influenced by body mass, total body lipid, and to a lesser extent, ambient air temperature and age. Sea lion pups captured in the Aleutian Islands (region of decline) had significantly greater body mass and total body lipid stores when compared to pups from Prince William Sound (region of decline) and Southeast Alaska (stable region). Along with evidence of robust body condition in Aleutian Island pups, no definitive differences were detected in RMR between sea lions sampled between eastern and western populations that could not be accounted for by higher percent total body lipid content, suggesting that that at the time of this study, Steller sea lions were not experiencing metabolic depression in the locations studied. |
format |
Text |
author |
Hoopes, Lisa A. Rea, Lorrie D. Christ, Aaron Worthy, Graham A. J. |
author_facet |
Hoopes, Lisa A. Rea, Lorrie D. Christ, Aaron Worthy, Graham A. J. |
author_sort |
Hoopes, Lisa A. |
title |
No Evidence of Metabolic Depression in Western Alaskan Juvenile Steller Sea Lions (Eumetopias jubatus) |
title_short |
No Evidence of Metabolic Depression in Western Alaskan Juvenile Steller Sea Lions (Eumetopias jubatus) |
title_full |
No Evidence of Metabolic Depression in Western Alaskan Juvenile Steller Sea Lions (Eumetopias jubatus) |
title_fullStr |
No Evidence of Metabolic Depression in Western Alaskan Juvenile Steller Sea Lions (Eumetopias jubatus) |
title_full_unstemmed |
No Evidence of Metabolic Depression in Western Alaskan Juvenile Steller Sea Lions (Eumetopias jubatus) |
title_sort |
no evidence of metabolic depression in western alaskan juvenile steller sea lions (eumetopias jubatus) |
publisher |
Public Library of Science |
publishDate |
2014 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3887069 https://doi.org/10.1371/journal.pone.0085339 |
genre |
Aleutian Island Alaska Aleutian Islands |
genre_facet |
Aleutian Island Alaska Aleutian Islands |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3887069 http://dx.doi.org/10.1371/journal.pone.0085339 |
op_rights |
http://creativecommons.org/publicdomain/zero/1.0/ This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 (http://creativecommons.org/publicdomain/zero/1.0/) public domain dedication. |
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CC0 PDM |
op_doi |
https://doi.org/10.1371/journal.pone.0085339 |
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PLoS ONE |
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9 |
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