Effects of feeding and habitat on resting metabolic rates of the Pacific walrus
Abstract Arctic marine mammals live in a rapidly changing environment due to the amplified effects of global warming. Pacific walruses ( Odobenus rosmarus divergens ) have responded to declines in Arctic sea‐ice extent by increasingly hauling out on land farther from their benthic foraging habitat....
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crwiley:10.1111/mms.13065 2024-09-15T17:52:42+00:00 Effects of feeding and habitat on resting metabolic rates of the Pacific walrus Rode, Karyn D. Rocabert, Joan Borque‐Espinosa, Alicia Ferrero‐Fernández, Diana Fahlman, Andreas 2023 http://dx.doi.org/10.1111/mms.13065 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.13065 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 40, issue 1, page 184-195 ISSN 0824-0469 1748-7692 journal-article 2023 crwiley https://doi.org/10.1111/mms.13065 2024-07-30T04:18:41Z Abstract Arctic marine mammals live in a rapidly changing environment due to the amplified effects of global warming. Pacific walruses ( Odobenus rosmarus divergens ) have responded to declines in Arctic sea‐ice extent by increasingly hauling out on land farther from their benthic foraging habitat. Energy models can be useful for better understanding the potential implications of changes in behavior on body condition and reproduction but require behavior‐specific metabolic rates. Here we measured the resting metabolic rates (RMR) of three captive, adult female Pacific walruses through breath‐by‐breath respirometry when fed and fasted resting out of water (sitting and lying down) and while fed resting in water. RMR in and out of water were positively related with pretrial energy intake when not fasted and 25% higher than RMR when walruses were fasted and out of water. Overall, RMR was higher than previously estimated for this species. Fasting RMR out of water was only 25% lower than subsurface swimming metabolic rates suggestive of relatively efficient swimming in adult females. Our results identify the importance of considering feeding status and species‐specific differences in affecting metabolic costs. Further research is needed to better understand potential energetic costs of thermoregulation at temperatures experienced by wild walruses. Article in Journal/Newspaper Arctic marine mammals Global warming Odobenus rosmarus Sea ice walrus* Wiley Online Library Marine Mammal Science |
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Wiley Online Library |
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English |
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Abstract Arctic marine mammals live in a rapidly changing environment due to the amplified effects of global warming. Pacific walruses ( Odobenus rosmarus divergens ) have responded to declines in Arctic sea‐ice extent by increasingly hauling out on land farther from their benthic foraging habitat. Energy models can be useful for better understanding the potential implications of changes in behavior on body condition and reproduction but require behavior‐specific metabolic rates. Here we measured the resting metabolic rates (RMR) of three captive, adult female Pacific walruses through breath‐by‐breath respirometry when fed and fasted resting out of water (sitting and lying down) and while fed resting in water. RMR in and out of water were positively related with pretrial energy intake when not fasted and 25% higher than RMR when walruses were fasted and out of water. Overall, RMR was higher than previously estimated for this species. Fasting RMR out of water was only 25% lower than subsurface swimming metabolic rates suggestive of relatively efficient swimming in adult females. Our results identify the importance of considering feeding status and species‐specific differences in affecting metabolic costs. Further research is needed to better understand potential energetic costs of thermoregulation at temperatures experienced by wild walruses. |
format |
Article in Journal/Newspaper |
author |
Rode, Karyn D. Rocabert, Joan Borque‐Espinosa, Alicia Ferrero‐Fernández, Diana Fahlman, Andreas |
spellingShingle |
Rode, Karyn D. Rocabert, Joan Borque‐Espinosa, Alicia Ferrero‐Fernández, Diana Fahlman, Andreas Effects of feeding and habitat on resting metabolic rates of the Pacific walrus |
author_facet |
Rode, Karyn D. Rocabert, Joan Borque‐Espinosa, Alicia Ferrero‐Fernández, Diana Fahlman, Andreas |
author_sort |
Rode, Karyn D. |
title |
Effects of feeding and habitat on resting metabolic rates of the Pacific walrus |
title_short |
Effects of feeding and habitat on resting metabolic rates of the Pacific walrus |
title_full |
Effects of feeding and habitat on resting metabolic rates of the Pacific walrus |
title_fullStr |
Effects of feeding and habitat on resting metabolic rates of the Pacific walrus |
title_full_unstemmed |
Effects of feeding and habitat on resting metabolic rates of the Pacific walrus |
title_sort |
effects of feeding and habitat on resting metabolic rates of the pacific walrus |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/mms.13065 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.13065 |
genre |
Arctic marine mammals Global warming Odobenus rosmarus Sea ice walrus* |
genre_facet |
Arctic marine mammals Global warming Odobenus rosmarus Sea ice walrus* |
op_source |
Marine Mammal Science volume 40, issue 1, page 184-195 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/mms.13065 |
container_title |
Marine Mammal Science |
_version_ |
1810294737042669568 |