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Type: Journal article
Title: Juvenile southern elephant seals exhibit seasonal differences in energetic requirements and use of lipids and protein stores
Author: Field, I.
Bradshaw, C.
Burton, H.
Hindell, M.
Citation: Physiological and Biochemical Zoology, 2005; 78(4):491-504
Publisher: Univ Chicago Press
Issue Date: 2005
ISSN: 1522-2152
Statement of
Iain C. Field, Corey J. A. Bradshaw, Harry R. Burton, Mark A. Hindell
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: Adipose Tissue
Seals, Earless
Body Weights and Measures
Linear Models
Sex Factors
Body Composition
Energy Metabolism
Antarctic Regions
Lipid Metabolism
Description: © 2005 by The University of Chicago
DOI: 10.1086/430227
Published version:
Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications
Environment Institute Leaders publications

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