Body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (Arctocephalus tropicalis) pups at Amsterdam Island
The fasting metabolism of 71- to 235-d-old subantarctic fur seal ( Arctocephalus tropicalis ) pups from Amsterdam Island, southern Indian Ocean, was investigated during the long foraging trips of their mothers. Body lipid reserves were proportionally greater in female than male pups and higher in po...
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ftdeakinunifig:oai:figshare.com:article/20577405 2023-05-15T13:22:24+02:00 Body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (Arctocephalus tropicalis) pups at Amsterdam Island G Beauplet C Guinet John Arnould 2003-03-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30015946 https://figshare.com/articles/journal_contribution/Body_composition_changes_metabolic_fuel_use_and_energy_expenditure_during_extended_fasting_in_subantarctic_fur_seal_Arctocephalus_tropicalis_pups_at_Amsterdam_Island/20577405 unknown http://hdl.handle.net/10536/DRO/DU:30015946 https://figshare.com/articles/journal_contribution/Body_composition_changes_metabolic_fuel_use_and_energy_expenditure_during_extended_fasting_in_subantarctic_fur_seal_Arctocephalus_tropicalis_pups_at_Amsterdam_Island/20577405 All Rights Reserved Physiology Zoology Science & Technology Life Sciences & Biomedicine KING PENGUIN CHICKS CALLORHINUS-URSINUS ELEPHANT SEAL GAZELLA PUPS MASS-LOSS GROWTH EFFICIENCY MILK CONSUMPTION MATERNAL-CARE LION PUPS PROTEIN Text Journal contribution 2003 ftdeakinunifig 2022-11-17T22:57:09Z The fasting metabolism of 71- to 235-d-old subantarctic fur seal ( Arctocephalus tropicalis ) pups from Amsterdam Island, southern Indian Ocean, was investigated during the long foraging trips of their mothers. Body lipid reserves were proportionally greater in female than male pups and higher in postmoult (37%) than premoult (10%) animals. The mass-specific rate of mass loss did not differ between the sexes but was lower than observed in other species. Daily mass loss was estimated to 56% fat, 10% protein, and 34% water. The rate of protein catabolism (15 g d −1 ) was negatively related to the size of initial lipid stores and accounted for 9% (±1%) of total energy expenditure. However, body composition changes during the fast were not equal between the sexes, with females relying more on protein catabolism than males (11% and 5% of total energy expenditure, respectively). Energy expenditure (270 kJ kg −1 d −1 ) and metabolic water production (11.5 mL kg −1 d −1 ) rates are the lowest reported for an otariid species. These results suggest that subantarctic fur seal pups greatly reduce activity levels to lower energy expenditure in addition to adopting protein-sparing metabolic pathways in order to survive the extreme fasts they must endure on Amsterdam Island. Other Non-Article Part of Journal/Newspaper Amsterdam Island Elephant Seal Callorhinus ursinus DRO - Deakin Research Online Indian |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Physiology Zoology Science & Technology Life Sciences & Biomedicine KING PENGUIN CHICKS CALLORHINUS-URSINUS ELEPHANT SEAL GAZELLA PUPS MASS-LOSS GROWTH EFFICIENCY MILK CONSUMPTION MATERNAL-CARE LION PUPS PROTEIN |
spellingShingle |
Physiology Zoology Science & Technology Life Sciences & Biomedicine KING PENGUIN CHICKS CALLORHINUS-URSINUS ELEPHANT SEAL GAZELLA PUPS MASS-LOSS GROWTH EFFICIENCY MILK CONSUMPTION MATERNAL-CARE LION PUPS PROTEIN G Beauplet C Guinet John Arnould Body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (Arctocephalus tropicalis) pups at Amsterdam Island |
topic_facet |
Physiology Zoology Science & Technology Life Sciences & Biomedicine KING PENGUIN CHICKS CALLORHINUS-URSINUS ELEPHANT SEAL GAZELLA PUPS MASS-LOSS GROWTH EFFICIENCY MILK CONSUMPTION MATERNAL-CARE LION PUPS PROTEIN |
description |
The fasting metabolism of 71- to 235-d-old subantarctic fur seal ( Arctocephalus tropicalis ) pups from Amsterdam Island, southern Indian Ocean, was investigated during the long foraging trips of their mothers. Body lipid reserves were proportionally greater in female than male pups and higher in postmoult (37%) than premoult (10%) animals. The mass-specific rate of mass loss did not differ between the sexes but was lower than observed in other species. Daily mass loss was estimated to 56% fat, 10% protein, and 34% water. The rate of protein catabolism (15 g d −1 ) was negatively related to the size of initial lipid stores and accounted for 9% (±1%) of total energy expenditure. However, body composition changes during the fast were not equal between the sexes, with females relying more on protein catabolism than males (11% and 5% of total energy expenditure, respectively). Energy expenditure (270 kJ kg −1 d −1 ) and metabolic water production (11.5 mL kg −1 d −1 ) rates are the lowest reported for an otariid species. These results suggest that subantarctic fur seal pups greatly reduce activity levels to lower energy expenditure in addition to adopting protein-sparing metabolic pathways in order to survive the extreme fasts they must endure on Amsterdam Island. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
G Beauplet C Guinet John Arnould |
author_facet |
G Beauplet C Guinet John Arnould |
author_sort |
G Beauplet |
title |
Body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (Arctocephalus tropicalis) pups at Amsterdam Island |
title_short |
Body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (Arctocephalus tropicalis) pups at Amsterdam Island |
title_full |
Body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (Arctocephalus tropicalis) pups at Amsterdam Island |
title_fullStr |
Body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (Arctocephalus tropicalis) pups at Amsterdam Island |
title_full_unstemmed |
Body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (Arctocephalus tropicalis) pups at Amsterdam Island |
title_sort |
body composition changes, metabolic fuel use and energy expenditure during extended fasting in subantarctic fur seal (arctocephalus tropicalis) pups at amsterdam island |
publishDate |
2003 |
url |
http://hdl.handle.net/10536/DRO/DU:30015946 https://figshare.com/articles/journal_contribution/Body_composition_changes_metabolic_fuel_use_and_energy_expenditure_during_extended_fasting_in_subantarctic_fur_seal_Arctocephalus_tropicalis_pups_at_Amsterdam_Island/20577405 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Amsterdam Island Elephant Seal Callorhinus ursinus |
genre_facet |
Amsterdam Island Elephant Seal Callorhinus ursinus |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30015946 https://figshare.com/articles/journal_contribution/Body_composition_changes_metabolic_fuel_use_and_energy_expenditure_during_extended_fasting_in_subantarctic_fur_seal_Arctocephalus_tropicalis_pups_at_Amsterdam_Island/20577405 |
op_rights |
All Rights Reserved |
_version_ |
1766364717653164032 |