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Environmental and senescent related variations in Weddell seal body mass: implications for age-specific reproductive performance

Citation

Proffitt, KM and Garrott, RA and Rotella, JJ and Wheatley, KE, Environmental and senescent related variations in Weddell seal body mass: implications for age-specific reproductive performance, Oikos, 116, (10) pp. 1683-1690. ISSN 0030-1299 (2007) [Refereed Article]

DOI: doi:10.1111/j.2007.0030-1299.16139.x

Abstract

Recent studies have found age-specific variations in reproductive performance amongst Weddell seals, Leptonychotes weddellii, and we hypothesized age-related variations in maternal body mass as a mechanism linking maternal age and the observed patterns of reproductive performance. We evaluated the effects of maternal traits such as age and reproductive experience and the effects of environmental variations on maternal body mass at parturition. Maternal body mass at parturition showed substantial age- and environmental-related variations. Maternal body mass increased with age through the young and middle ages, and evidence of senescent declines in body mass was found amongst the oldest ages. Additionally, body mass at parturition was strongly influenced by environmental variations during the pregnancy period, specifically sea-ice extent and the state of the El-Niño Southern Oscillation. Patterns of age-specific variations in body mass were consistent with age-specific patterns of offspring survival probability, which supported our hypothesis that changes in body mass link maternal age and reproductive performance in the Weddell seal. Further, environmental conditions during pregnancy may be an important component of Weddell seal reproductive performance. © OIKOS.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Population Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Wheatley, KE (Dr Kathryn Wheatley)
ID Code:47545
Year Published:2007
Web of Science® Times Cited:34
Deposited By:Zoology
Deposited On:2007-08-01
Last Modified:2008-04-02
Downloads:0

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