Inbreeding, inbreeding depression, and infidelity in a cooperatively breeding bird

Evolution; International Journal of Organic Evolution
Gabriela K HajdukLoeske E B Kruuk

Abstract

Inbreeding depression plays a major role in shaping mating systems: in particular, inbreeding avoidance is often proposed as a mechanism explaining extra-pair reproduction in socially monogamous species. This suggestion relies on assumptions that are rarely comprehensively tested: that inbreeding depression is present, that higher kinship between social partners increases infidelity, and that infidelity reduces the frequency of inbreeding. Here, we test these assumptions using 26 years of data for a cooperatively breeding, socially monogamous bird with high female infidelity, the superb fairy-wren (Malurus cyaneus). Although inbred individuals were rare (∼6% of offspring), we found evidence of inbreeding depression in nestling mass (but not in fledgling survival). Mother-son social pairings resulted in 100% infidelity, but kinship between a social pair did not otherwise predict female infidelity. Nevertheless, extra-pair offspring were less likely to be inbred than within-pair offspring. Finally, the social environment (the number of helpers in a group) did not affect offspring inbreeding coefficients or inbreeding depression levels. In conclusion, despite some agreement with the assumptions that are necessary for inbreeding av...Continue Reading

Associated Datasets

Apr 6, 2018·Jose Aguilar-RodriguezLeto Peel

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Citations

Jun 20, 2018·Evolution; International Journal of Organic Evolution·Anna L Petrosky
Oct 7, 2019·Molecular Ecology·Lyanne Brouwer, Simon C Griffith
Feb 1, 2019·BMC Biology·Aneesh P H BoseKristina M Sefc
Mar 10, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·G K HajdukL E B Kruuk
Oct 4, 2019·Behavioral Ecology : Official Journal of the International Society for Behavioral Ecology·Sara Raj PantDavid S Richardson
Jun 24, 2020·Proceedings of the National Academy of Sciences of the United States of America·Amy E LeedaleBen J Hatchwell
Oct 13, 2020·Journal of Evolutionary Biology·Eve B CooperLoeske E B Kruuk
Mar 23, 2021·Molecular Ecology Resources·Andrew CockburnMartijn van de Pol

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Methods Mentioned

BETA
genotyping
KINSHIP

Software Mentioned

R package ASReml ‐ R
MCMCglmm
ASReml
R package MCMCglmm
R

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