lateralis, exhibits genetic patterns consistent with a strong influence of distance-mediated gene flow. We consider population genetic structure and phenotypic divergence among two co-distributed, congeneric (Genus: Zosterops) bird species inhabiting the Vanuatu archipelago. If this transition is important in facilitating phenotypic divergence, levels of genetic and phenotypic divergence should be associated. In island colonizing birds, selection for reduced dispersal ability is predicted to produce changing patterns of regional population genetic structure as gene flow-dominated systems give way to drift-mediated divergence. The amount of gene flow among allopatric populations is one factor proposed to contribute to this variation. However, some archipelagos are home to spectacular radiations, while others have much lower levels of diversification. Colonization of an archipelago sets the stage for adaptive radiation.
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