Fig. 3: Map of habitat and elevation at contact zones.

Distribution of hybrids in the Great Plains contact zone across (A) elevational and (B) habitat gradients, and hybrids in the Rocky Mountain contact zone across (C) elevational and (D) habitat gradients. Triangles denote putative hybrids between eastern and western genetic lineages (A, B), while circles denote putative hybrids between the two western genetic lineages (C, D).