Fig. 4: Genome-wide patterns of introgression between Bullock’s and Baltimore orioles.

Geographic clines for 4 marker types (top): control (ddRAD sequencing data set from Walsh et al., 2019), fixed amplicons, amplicons putatively linked to melanogenesis, and inversion-linked amplicons. Individuals were sampled along the Platte River transect (bottom) and the clines run from west to east. Crook, Colorado is circled in red and is the approximate center of the control, melanin-linked, and inversion-linked clines. Map inset illustrated by Megan Bishop, 2018.