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Population structure analysis results. a Stacked diagram generated using STRUCTURE. b Scatter plot of principal components 1 and 2 (PCA1 vs. PCA2) from 31 populations collected from 11 regions. Groups 1–31 correspond to LQ1, LQ2, QD1, QD2, WL1, WL2, QC1, QC2, WC1, WC2, WC3, WC4, HZ1, RZ1, RZ2, RZ3, ZZ1, ZZ2, LA, MY1, MY2, MY3, MY4, YY1, YY2, YY3, YY4, YY5, YY6, YY7, YY8 (c) Individual bee are adjacent to phylogenetic trees
