Principal components analysis of allele frequencies from 18 microsatellites and 93 SNPs and the first 50 eigenvalues.

<p>a) First (PC1) and second (PC2) principal components and b) first (PC1) and third (PC3) principal components. The difference in color (red, blue and green) between clusters indicates divergence using the first three principal components. Seven clusters are shown (see text for description of cluster membership). NSMO: Northern Sierra Madre Occidental.