Selection on a small genomic region underpins differentiation in multiple color traits between two warbler species

Silu Wang, Sievert Rohwer, Devin De Zwaan, David Toews, Irby Lovette, Jacqueline Mackenzie & Darren Irwin
Speciation is one of the most important processes in biology, yet the study of the genomic changes underlying this process is in its infancy. North American warbler species Setophaga townsendi and S. occidentalis hybridize in a stable hybrid zone, following a period of geographic separation. Genomic differentiation accumulated during geographic isolation can be homogenized by introgression at secondary contact, while genetic regions that cause low hybrid fitness can be shielded from such introgression. Here we...
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