Data from: Extra-pair paternity and the variance in male fitness in song sparrows (Melospiza melodia)

Christophe Lebigre, Peter Arcese, Rebecca J. Sardell, Lukas F. Keller & Jane M. Reid
The variance in fitness across population members can influence major evolutionary processes. In socially monogamous but genetically polygynandrous species, extra-pair paternity (EPP) is widely hypothesized to increase the variance in male fitness compared to that arising given the socially monogamous mating system. This hypothesis has not been definitively tested because comprehensive data describing males’ apparent (social) and realized (genetic) fitness have been lacking. We used 16 years of comprehensive social and genetic paternity data for...
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