Phylogeography Reveals Routes of Colonization of the Bark Beetle

We used mitochondrial DNA (mtDNA) sequence data and allele frequencies at eight microsatellite loci to examine the popula-tion genetic structure, estimate the divergence times of distinct lineages, and infer patterns associated with host colonization in populations of the bark beetle Dendroctonus approximatus in Mexico. Two haplotype groups were identified using mtDNA sequences in 71 individuals from 15 populations. The first group was distributed in the Sierra Madre Occidental (SMOc, Western Mexico), with some populations in the Faja Volcánica Transmexicana (Central Mexico), and the second was foun