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Juvenile southern elephant seals exhibit seasonal differences in energetic requirements and use of lipids and protein stores

Field, Iain C., Bradshaw, Corey J. A., Burton, Harry R. and Hindell, Mark A. (2005). Juvenile southern elephant seals exhibit seasonal differences in energetic requirements and use of lipids and protein stores. Physiological and Biochemical Zoology,78(4):491-504.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 13 times in Scopus Article | Citations

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IRMA ID 78671349xPUB21
Title Juvenile southern elephant seals exhibit seasonal differences in energetic requirements and use of lipids and protein stores
Author Field, Iain C.
Bradshaw, Corey J. A.
Burton, Harry R.
Hindell, Mark A.
Journal Name Physiological and Biochemical Zoology
Publication Date 2005
Volume Number 78
Issue Number 4
ISSN 1522-2152   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-21044453652
Start Page 491
End Page 504
Total Pages 14
Place of Publication Chicago, IL, United States
Publisher The University of Chicago Press
Field of Research 0602 - Ecology
0608 - Zoology
1116 - Medical Physiology
HERDC Category C1 - Journal Article (DEST)
Abstract 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.
Keywords mirounga leonina l
body mass loss
macquarie island
postweaning fast
metabolic rate
phoca groenlandica
blubber thickness
growth
DOI http://dx.doi.org/10.1086/430227   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)


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