Figure 1

Distribution map of Myodes rutilus , M. gapperi , and introgressants in southeast Alaska. Open circles refer to individuals with post-palatal bridge morphology, cytochrome b haplotypes, and MYH6 alleles of M. rutilus. Black shaded circles refer to individuals with post-palatal bridge morphology, cytochrome b haplotypes, and MYH6 alleles of M. gapperi. Grey shaded circles refer to individuals with post-palatal bridge morphology and MYH6 alleles of M. gapperi and cytochrome b haplotypes of M. rutilus. Numbers correspond to population numbers in Table 1. The grey dashed line indicates change in post-palatal bridge morphology. Stippled areas indicate present-day glaciers. Inset of highlighted area is GIS glacial coverage that shows the LeConte Glacier extending to the coast, resulting in a physical barrier between populations 7 and 8.