Figure 2. Plots of the microsatellite population assignment (using STRUCTURE) and all five acoustic variables clines.

Dots are the mean values for each individual. The three plumage forms/subspecies are indicated by dot colour as follows: P. e. flaveolus, yellow dots; the Western Slopes population, purple dots; P. e. elegans, red dots. Green lines connect the means of each population, and the dotted line within the vocalization plots indicates the microsatellite cline for comparison. At this latitude 1 degree of longitude is roughly 92km, and the transect changes little with latitude (Fig. 1).