Divergent selection on bill morphology contributes to nonrandom mating between swamp sparrow subspecies
سه شنبه , 08 مرداد 1392 ساعت 21:34 دسته بندی : علم زندگی ,دانلود مقاله :
Divergent selection on bill morphology contributes to nonrandom mating between swamp sparrow subspecies 2013
نویسندگان :
Barbara Ballentine , Brent Horton , E. Tracy Brown , Russell Greenberg
چکیده :
Traits subject to ecologically based divergent selection that also affect nonrandom mating (i.e. ‘magic
traits’) may hasten incipient speciation. In this study, we investigated whether nonrandom mating results
from ecological divergence between swamp sparrow, Melospiza georgiana, subspecies. As a byproduct
of adaptive divergence in bill morphology between populations of swamp sparrows, there is a
corresponding divergence in features of song shown to be salient to females, potentially providing a
mechanism of reproductive isolation. Thus, female mating preferences for song could result in prezygotic
isolation that prevents gene flow between subspecies. In this study we tested the hypothesis that female
preferences for song provide a mechanism of reproductive isolation that limits gene flow between
subspecies. Using copulation solicitation assays, we found that female coastal plain swamp sparrows
showed a significant preference for consubspecific songs over heterosubspecific songs.We further tested
whether mating preferences in coastal populations explain observed differences in song between subspecies.
We found evidence that mating preferences in coastal females may explain the evolution of
some acoustic features of song. We suggest that the bill may be an example of a ‘magic trait’ that
contributes to continued divergence of swamp sparrow subspecies
?> behaviour Melospiza georgiana morphological evolution speciation swamp sparrow , دانلود مقاله کشاورزیمطالب مرتبط :
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