Gene flow between populations — caused by migration, for instance — is most often viewed as a homogenizing force in evolution. But two studies of wild birds and non-random dispersal find otherwise.
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Coltman, D. Differentiation by dispersal. Nature 433, 23–24 (2005). https://doi.org/10.1038/433023a
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DOI: https://doi.org/10.1038/433023a
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