Kin association during brood care in a facultatively social bird: active discrimination or by-product of partner choice and demography?

Molecular Ecology
Kim JaatinenMarkus Öst

Abstract

Intra-group relatedness does not necessarily imply kin selection, a leading explanation for social evolution. An overlooked mechanism for generating population genetic structure is variation in longevity and fecundity, referred to as individual quality, affecting kin structure and the potential for cooperation. Individual quality also affects choosiness in partner choice, a key process explaining cooperation through direct fitness benefits. Reproductive skew theory predicts that relatedness decreases with increasing group size, but this relationship could also arise because of quality-dependent demography and partner choice, without active kin association. We addressed whether brood-rearing eider (Somateria mollissima) females preferentially associated with kin using a 6-year data set with individuals genotyped at 19 microsatellite loci and tested whether relatedness decreased with increasing female group size. We also determined the relationship between local relatedness and indices of female age and body condition. We further examined whether the level of female intracoalition relatedness differed from background relatedness in any year. As predicted, median female intra-group relatedness decreased with increasing female grou...Continue Reading

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Citations

Apr 5, 2013·Biology Letters·Heikki HelanteräPatrizia d'Ettorre
Jan 26, 2013·The American Naturalist·Kim Jaatinen, Markus Öst
Apr 29, 2015·Molecular Ecology·Yung Wa SinHannah L Dugdale
Aug 4, 2018·Biological Reviews of the Cambridge Philosophical Society·Malte AnderssonPeter Waldeck

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