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Frode Jacobsen and Kevin E. Omland Extensive introgressive hybridization within the northern oriole group (Genus Icterus) revealed by three-species isolation with migration analysis Ecology and Evolution 2

Version of Record online: 29 AUG 2012 | DOI: 10.1002/ece3.365

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Coalescent-based isolation-migration approaches such as IMa2 are key to assessing the role of gene flow for recently diverged taxa. Our study reveals the complexity of evolutionary processes that have contributed to produce the observed pattern of rampant allele sharing among the three species within the northern oriole group. Furthermore, our findings highlight the importance of accounting for all potentially interbreeding taxa when interpreting the divergence history of a group of taxa, and the extent to which gene flow may retard the rate of divergence at neutral loci.

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