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The proportion of winter adults assigned to a subspecies in each nonbreeding region based on admixture coefficients (Q ≥ 0.80) derived in Structure 2.3 (Pritchard et al. 2000) (Eastern United States, Region 1, n = 63; Central United States, Region 2, n = 54; Western United States and Eastern Mexico, Region 3, n = 209; Western Mexico, Region 4, n = 130)
