THE PHYSIOLOGICAL TRANSITION FROM FASTING TO FEEDING IN WEANED ELEPHANT SEAL PUPS
A bstract We studied energetics and food utilization in young elephant seals as they were first introduced to solid food following their long post‐weaning fast. Using radioactive tracer techniques, we monitored changes in body composition, protein metabolism, and metabolic rate during fasting and in...
Published in: | Marine Mammal Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley
1987
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Online Access: | http://dx.doi.org/10.1111/j.1748-7692.1987.tb00164.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.1987.tb00164.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.1987.tb00164.x |
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crwiley:10.1111/j.1748-7692.1987.tb00164.x 2023-12-03T10:22:05+01:00 THE PHYSIOLOGICAL TRANSITION FROM FASTING TO FEEDING IN WEANED ELEPHANT SEAL PUPS Condit, Richard S. Ortiz, C. Leo 1987 http://dx.doi.org/10.1111/j.1748-7692.1987.tb00164.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.1987.tb00164.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.1987.tb00164.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 3, issue 3, page 207-219 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1987 crwiley https://doi.org/10.1111/j.1748-7692.1987.tb00164.x 2023-11-09T14:22:05Z A bstract We studied energetics and food utilization in young elephant seals as they were first introduced to solid food following their long post‐weaning fast. Using radioactive tracer techniques, we monitored changes in body composition, protein metabolism, and metabolic rate during fasting and initial feeding. In fasting animals, fat stores supplied nearly all energetic requirements. In feeding animals, 49% of protein ingested was retained as body tissue, allowing protein mass to increase. Body fat was lost at rates comparable to rates in fasting animals and continued to fuel the bulk of metabolism. Weight loss was arrested when animals consumed 786 g/d, or 40 kcal/kg 0.75 /d, which was far less than their metabolic rates (63–206 kcal/kg 0.75 /d). Surprisingly, the young seals were able to maintain weight and store protein while energy intake was below metabolic needs. This was possible because animals gained weight as water; they retained wellhydrated proteinaceous tissue while losing poorly‐hydrated adipose tissue. Article in Journal/Newspaper Elephant Seal Elephant Seals Wiley Online Library (via Crossref) Marine Mammal Science 3 3 207 219 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Condit, Richard S. Ortiz, C. Leo THE PHYSIOLOGICAL TRANSITION FROM FASTING TO FEEDING IN WEANED ELEPHANT SEAL PUPS |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
A bstract We studied energetics and food utilization in young elephant seals as they were first introduced to solid food following their long post‐weaning fast. Using radioactive tracer techniques, we monitored changes in body composition, protein metabolism, and metabolic rate during fasting and initial feeding. In fasting animals, fat stores supplied nearly all energetic requirements. In feeding animals, 49% of protein ingested was retained as body tissue, allowing protein mass to increase. Body fat was lost at rates comparable to rates in fasting animals and continued to fuel the bulk of metabolism. Weight loss was arrested when animals consumed 786 g/d, or 40 kcal/kg 0.75 /d, which was far less than their metabolic rates (63–206 kcal/kg 0.75 /d). Surprisingly, the young seals were able to maintain weight and store protein while energy intake was below metabolic needs. This was possible because animals gained weight as water; they retained wellhydrated proteinaceous tissue while losing poorly‐hydrated adipose tissue. |
format |
Article in Journal/Newspaper |
author |
Condit, Richard S. Ortiz, C. Leo |
author_facet |
Condit, Richard S. Ortiz, C. Leo |
author_sort |
Condit, Richard S. |
title |
THE PHYSIOLOGICAL TRANSITION FROM FASTING TO FEEDING IN WEANED ELEPHANT SEAL PUPS |
title_short |
THE PHYSIOLOGICAL TRANSITION FROM FASTING TO FEEDING IN WEANED ELEPHANT SEAL PUPS |
title_full |
THE PHYSIOLOGICAL TRANSITION FROM FASTING TO FEEDING IN WEANED ELEPHANT SEAL PUPS |
title_fullStr |
THE PHYSIOLOGICAL TRANSITION FROM FASTING TO FEEDING IN WEANED ELEPHANT SEAL PUPS |
title_full_unstemmed |
THE PHYSIOLOGICAL TRANSITION FROM FASTING TO FEEDING IN WEANED ELEPHANT SEAL PUPS |
title_sort |
physiological transition from fasting to feeding in weaned elephant seal pups |
publisher |
Wiley |
publishDate |
1987 |
url |
http://dx.doi.org/10.1111/j.1748-7692.1987.tb00164.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.1987.tb00164.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.1987.tb00164.x |
genre |
Elephant Seal Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals |
op_source |
Marine Mammal Science volume 3, issue 3, page 207-219 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.1987.tb00164.x |
container_title |
Marine Mammal Science |
container_volume |
3 |
container_issue |
3 |
container_start_page |
207 |
op_container_end_page |
219 |
_version_ |
1784269903364096000 |