Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores
Growing juvenile animals undergo many morphological, physiological, and behavioural changes that influence their energetic requirements, patterns of energy use, and ultimately, their survival and reproductive success. We examined changes in mass loss and body composition of juvenile southern elephan...
Published in: | Physiological and Biochemical Zoology |
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Univ Chicago Press
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Online Access: | https://doi.org/10.1086/430227 http://www.ncbi.nlm.nih.gov/pubmed/15957104 http://ecite.utas.edu.au/33831 |
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ftunivtasecite:oai:ecite.utas.edu.au:33831 2023-05-15T16:05:38+02:00 Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores Field, IC Bradshaw, CJA Burton, HR Hindell, MA 2005 https://doi.org/10.1086/430227 http://www.ncbi.nlm.nih.gov/pubmed/15957104 http://ecite.utas.edu.au/33831 en eng Univ Chicago Press http://dx.doi.org/10.1086/430227 Field, IC and Bradshaw, CJA and Burton, HR and Hindell, MA, Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores, Physiological and Biochemical Zoology, 78, (4) pp. 491-504. ISSN 1522-2152 (2005) [Refereed Article] http://www.ncbi.nlm.nih.gov/pubmed/15957104 http://ecite.utas.edu.au/33831 Biological Sciences Physiology Comparative Physiology Refereed Article PeerReviewed 2005 ftunivtasecite https://doi.org/10.1086/430227 2019-12-13T21:12:46Z Growing juvenile animals undergo many morphological, physiological, and behavioural changes that influence their energetic requirements, patterns of energy use, and ultimately, their survival and reproductive success. We examined changes in mass loss and body composition of juvenile southern elephant seals (1- and 2-yr-olds) during their two annual haul-outs. At the start and end of the midyear and molt haul-outs, we caught, weighed, and measured 41 and 14 seals, respectively. We measured blubber depth using ultrasound to estimate body composition (lean and adipose tissue mass). Using energy densities of the adipose and lean tissue, we calculated total, lean, and adipose mass changes and energy expenditure. While molting, juvenile seals used more energy than during the midyear, which is related to the increased use of lean tissue for hair and skin regeneration. The amount of energy used increases with mass as individuals mature. We found sexual differences in energy use where females retained greater fat reserves than males by utilizing more lean tissue. These differences are most likely related to haul-out function and behavior, growth, and earlier development of females toward sexual maturity. 2005 by The University of Chicago. All rights reserved. Article in Journal/Newspaper Elephant Seals Southern Elephant Seals eCite UTAS (University of Tasmania) Physiological and Biochemical Zoology 78 4 491 504 |
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Biological Sciences Physiology Comparative Physiology |
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Biological Sciences Physiology Comparative Physiology Field, IC Bradshaw, CJA Burton, HR Hindell, MA Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores |
topic_facet |
Biological Sciences Physiology Comparative Physiology |
description |
Growing juvenile animals undergo many morphological, physiological, and behavioural changes that influence their energetic requirements, patterns of energy use, and ultimately, their survival and reproductive success. We examined changes in mass loss and body composition of juvenile southern elephant seals (1- and 2-yr-olds) during their two annual haul-outs. At the start and end of the midyear and molt haul-outs, we caught, weighed, and measured 41 and 14 seals, respectively. We measured blubber depth using ultrasound to estimate body composition (lean and adipose tissue mass). Using energy densities of the adipose and lean tissue, we calculated total, lean, and adipose mass changes and energy expenditure. While molting, juvenile seals used more energy than during the midyear, which is related to the increased use of lean tissue for hair and skin regeneration. The amount of energy used increases with mass as individuals mature. We found sexual differences in energy use where females retained greater fat reserves than males by utilizing more lean tissue. These differences are most likely related to haul-out function and behavior, growth, and earlier development of females toward sexual maturity. 2005 by The University of Chicago. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Field, IC Bradshaw, CJA Burton, HR Hindell, MA |
author_facet |
Field, IC Bradshaw, CJA Burton, HR Hindell, MA |
author_sort |
Field, IC |
title |
Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores |
title_short |
Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores |
title_full |
Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores |
title_fullStr |
Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores |
title_full_unstemmed |
Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores |
title_sort |
juvenile southern elephant seals exhibit seasonal difference in energetic requirements and use of lopids and protein stores |
publisher |
Univ Chicago Press |
publishDate |
2005 |
url |
https://doi.org/10.1086/430227 http://www.ncbi.nlm.nih.gov/pubmed/15957104 http://ecite.utas.edu.au/33831 |
genre |
Elephant Seals Southern Elephant Seals |
genre_facet |
Elephant Seals Southern Elephant Seals |
op_relation |
http://dx.doi.org/10.1086/430227 Field, IC and Bradshaw, CJA and Burton, HR and Hindell, MA, Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores, Physiological and Biochemical Zoology, 78, (4) pp. 491-504. ISSN 1522-2152 (2005) [Refereed Article] http://www.ncbi.nlm.nih.gov/pubmed/15957104 http://ecite.utas.edu.au/33831 |
op_doi |
https://doi.org/10.1086/430227 |
container_title |
Physiological and Biochemical Zoology |
container_volume |
78 |
container_issue |
4 |
container_start_page |
491 |
op_container_end_page |
504 |
_version_ |
1766401540339269632 |