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A GENETIC AND BEHAVIORAL ANALYSIS OF MATE CHOICE AND SONG NEIGHBORHOODS IN INDIGO BUNTINGS.

Neighboring males of indigo buntings (Passerina cyanea) share songs in southern Michigan. We sampled polymorphic enzymes to compare the genetic variation between mates and the variation among contiguous song neighborhoods. Mate choice was independent of the genetic and morphometric similarity of female and male, and these measures were independent of each other. The incidence of extrapair copulations and fertilizations was independent of the song of cuckolding males. Breeding success of the mated pairs was independent of their genetic or morphological similarity. Males characterized by different song dialects did not differ in mean lifetime reproductive success. We found no significant genetic differences among the neighborhoods. Most birds that bred in one song neighborhood were born in another, and neighborhoods were not isolated demes. Bunting songs may provide no information to a female about genetic quality of males. The results are consistent with a neutral model of no mate choice for genes.

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