Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||Juvenile southern elephant seals exhibit seasonal differences in energetic requirements and use of lipids and protein stores|
|Citation:||Physiological and Biochemical Zoology, 2005; 78(4):491-504|
|Publisher:||Univ Chicago Press|
|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.|
Body Weights and Measures
|Description:||© 2005 by The University of Chicago|
|Appears in Collections:||Aurora harvest|
Earth and Environmental Sciences publications
Environment Institute Leaders publications
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.