Data from: Kin association during brood care in a facultatively social bird: active discrimination or byproduct of partner choice and demography?

Kim Jaatinen, Kristina Noreikiene, Juha Merilä & Markus Öst
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...
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