Tests for introgression and putative adaptive loci. (A) Genes with a significant footprint of introgression as estimated by thef -branch statistic. Darker colors indicate greater evidence of gene flow between species. The dotted lines in the phylogeny represent the ancestral lineage. (B) Tests for introgression using the all-biallelic SNP data set. The arrows represent the direction and the species with gene flow estimated by TreeMix (orange dotted line), Dsuite (brown dotted line), and PhyloNetworks (blue lines). The blue numbers represent the proportion of genes inherited via gene flow from each parent. (C) Environmental differences between the sampling locations and species as measured by the eight retained factors: mean diurnal range (BIO2), temperature seasonality (BIO4), maximum temperature of the warmest month (BIO5), minimum temperature of the coldest month (BIO6), precipitation of the driest quarter (BIO17), precipitation of the warmest quarter (BIO18), solar radiation in September (Solar9), and global aridity index (Aridity). The y-axis represents the value of the associated environmental factor. (D) Outlier SNP sites scanned with each deployed method. The numbers represent the number of scanned and overlapping SNP sites from each procedure.