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Site fidelity of Weddell seals: the effects of sex and age

Published online by Cambridge University Press:  22 May 2007

Michael F. Cameron*
Affiliation:
National Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 7600 Sand Point Way NE, Seattle, WA 98115, USA
Donald B. Siniff
Affiliation:
Department of Ecology, Evolution and Behavior, 100 Ecology, University of Minnesota, St Paul, MN 55108, USA
Kelly M. Proffitt
Affiliation:
Ecology Department, 310 Lewis Hall, Montana State University, Bozeman, MT 59717, USA
Robert A. Garrott
Affiliation:
Ecology Department, 310 Lewis Hall, Montana State University, Bozeman, MT 59717, USA

Abstract

Site fidelity is believed to be an important life history strategy for Weddell seals (Leptonychotes weddellii), that return to traditional breeding colonies each spring. We examined four hypotheses concerning their fidelity to these colonies: 1) fidelity is stronger to natal sites (natal fidelity) than to other sites, 2) females exhibit greater site fidelity than males, 3) site fidelity for both sexes increases with age, 4) site fidelity in adult females is related to their reproductive status and their total number of offspring. Analysis of a long-term tagging database from McMurdo Sound did not support hypotheses 1 and 2. Although animals did express fidelity to specific sites over their lifetime (χ2 tests, P < 0.05), fidelity to natal colonies was lower than to other sites (χ2 test, P < 0.05). There were no differences in site fidelity between males and females (χ2 tests, P > 0.05). Hypothesis 3 was supported. Since the probability of a returning seal occupying the same colony as the previous year increased with age among both sexes to about age 12. Finally, in support of hypothesis 4, females with a higher degree of site fidelity were more likely to both have a higher reproductive rate and return to a site where they have previously given birth.

Type
IX SCAR International Biology Symposium
Copyright
Copyright © Antarctic Science Ltd 2007

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