Figure 1. Distribution and genetic structure of the Sporophila corvinasubspecies in Costa Rica and Panama. A) Typical male plumage per subspecies, subspecies distributions highlighting contact zones between subspecies (numbered), and known regions with intermediate individuals (striped pattern). Map based on the distributions from Olson (1981) and Stiles (1996). B) Estimated effective migration surface, dark orange region along the continental divide represents a barrier of 100 times reduced gene flow. C) Admixture proportion per individual, based on the best result from ADMIXURE (K = 3).