Fig. 1. A map of northeastern North America indicating the Golden-winged Warbler breeding range (shaded area). The dark sections of the pie charts in each state/province indicate the proportion of Golden-winged Warbler samples that were assigned to the ancestral Golden-winged Warbler haplotype group; the lighter grey areas represent the proportion of Golden-winged Warbler samples assigned to the Blue-winged Warbler haplotype group. Numbers within pie charts represent the number of Golden-winged Warblers that were sampled per state/province. MB stands for Manitoba; ON, Ontario; QC, Quebec; MN, Minnesota; WI, Wisconsin; NY, New York; PA, Pennsylvania; WV, West Virginia; TN, Tennessee; and NC, North Carolina.