Fig. 2. A map of northeastern North America indicating the Blue-winged Warbler breeding range (shaded area). The dark sections of the pie charts in each state/province indicate the proportion of Blue-winged Warbler samples that were assigned to the ancestral Blue-winged Warbler haplotype group; the lighter grey areas represent the proportion of Blue-winged Warbler samples assigned to the Golden-winged Warbler haplotype group. Numbers within pie charts represent the number of Blue-winged Warblers that were sampled per state/province. MB stands for Manitoba; ON, Ontario; QC, Quebec; WI, Wisconsin; NY, New York; MO, Missouri; KY, Kentucky; and WV, West Virginia.