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Behavioral Ecology Advance Access published online on March 2, 2005
Behavioral Ecology, doi:10.1093/beheco/ari035
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© The Author 2005. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org
Received July 1, 2004
Revised January 5, 2005
Accepted January 27, 2005

Article

Reproductive consequences of natal dispersal in a highly philopatric seabird

Ulrich K. Steiner 1* and Anthony J. Gaston 2

1 Zoologisches Institut, Universität Zürich, Winterthurerstr. 190, 8057 Zürich, Switzerland
2 Canadian Wildlife Service, National Wildlife Research Centre, Carleton University, Ottawa, Ontario, K1A 0H3, Canada

* To whom correspondence should be addressed.
Ulrich K. Steiner, E-mail: usteiner{at}zool.unizh.ch


  Abstract

Natal and breeding dispersal have a major impact on gene flow and population structure. We examined the consequences of natal dispersal on the reproductive success (proportion of pairs rearing chicks) of colonial-breeding Thick-billed murres (Uria lomvia). Reproductive success increased with distance dispersed for the first and second breeding attempt. The increase in breeding success leveled off at natal dispersal distances above 7 m. Our results were consistent with the idea that the relationship between dispersal and reproductive success is caused by site availability and mate choice as birds willing to disperse farther had a greater choice of potential sites and mates. This hypothesis was supported by the fact that birds dispersing farther were more likely to pair with an experienced breeder, which increases the likelihood of breeding success for young breeders. Explanations for increasing breeding success with increased dispersal based on inbreeding effects were unlikely because most breeding failures were caused by egg loss rather than infertility or nestling death. However, we could not explain why >50% of birds return within 3 m of the natal site, despite having an up to 50% lower reproductive success than birds dispersing 7 m or more.

Keywords: breeding success; natal dispersal; natal philopatry; optimal dispersal distance; reproductive success; Uria lomvia.
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S.-Y. Kim, R. Torres, C. A. Dominguez, and H. Drummond
Lifetime philopatry in the blue-footed booby: a longitudinal study
Behav. Ecol., November 1, 2007; 18(6): 1132 - 1138.
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