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Behavioral Ecology Advance Access published online on February 5, 2009
Behavioral Ecology, doi:10.1093/beheco/arp006
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© The Author 2009. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Extrapair paternity in an insular population of house sparrows after the experimental introduction of individuals from the mainland

Nancy Ockendona, Simon C. Griffithb and Terry Burkea

a Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK b Centre for the Integrative Study of Animal Behaviour, Macquarie University, Sydney, NSW 2109, Australia

Address correspondence to S. Griffith. E-mail: simon.griffith{at}mq.edu.au.


  Abstract

Several studies have found that island populations of passerines exhibit lower levels of extrapair paternity (EPP) than mainland populations. An explanation proposing that lower levels of genetic diversity in isolated populations reduce the indirect genetic benefits of EPP to females has been supported by observational study but not tested experimentally. Here, we present the results of a manipulative study on an island population of house sparrows (Passer domesticus), which previously exhibited a significantly lower frequency of EPP than mainland populations. Fifty adults from a mainland population with significantly more genetic diversity than the island population (across 17 microsatellite loci) were introduced into the island population, and the incidence of EPP was subsequently monitored over 3 breeding seasons. In the year of the introduction, the incidence of EPP rose to approximately the level seen in mainland populations of house sparrows but dropped to an intermediate frequency in the following 2 years. Unexpectedly, parentage assignment showed that in the year of the introduction, all females producing extrapair offspring were native island birds, as were all the extrapair and cuckolded males. These results suggest that EPP in this experimental population was not driven by females trying to maximize the genetic diversity of their offspring.

Key words: extrapair paternity, genetic variation, introduction experiment, island population, Passer domesticus.

Received 17 June 2008; revised 17 December 2008; accepted 22 December 2008.


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