Data from: Extrapair mating and the strength of sexual selection: insights from a polymorphic species

Andrea S. Grunst, Melissa L. Grunst, Marisa L. Korody, Lindsay M. Forrette, Rusty A. Gonser & Elaina M. Tuttle
Extra-pair mating could drive sexual selection in socially monogamous species, but support for this hypothesis remains equivocal. We used lifetime fitness data and a unique model species, the dimorphic white-throated sparrow (Zonotrichia albicollis), to examine how extra-pair mating affects the potential for sexual selection. The morphs of this species employ distinct reproductive strategies, with white males pursuing extra-pair mating at higher rates than tan counterparts. Social and extra-pair mating is disassortative by morph, with paternity...
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