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Juvenile Southern Elephant Seals Exhibit Seasonal Difference in Energetic Requirements and Use of Lopids and Protein Stores

Citation

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]

DOI: doi:10.1086/430227

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. © 2005 by The University of Chicago. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Physiology
Research Field:Comparative Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Field, IC (Dr Iain Field)
Author:Bradshaw, CJA (Dr Corey Bradshaw)
Author:Hindell, MA (Professor Mark Hindell)
ID Code:33831
Year Published:2005
Web of Science® Times Cited:15
Deposited By:Zoology
Deposited On:2005-08-01
Last Modified:2006-06-07
Downloads:0

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