| phylogeography of a post-glacial colonizer: microtus longicaudus (rodentia: muridae). | the molecular phylogeography of microtus longicaudus was investigated with dna sequences of the mitochondrial cytochrome b gene. we used phylogenetic and pairwise distance methods to reconstruct the history of the species with particular emphasis on the pacific northwest. genetic variation across the species was consistent with vicariant events during the pleistocene and subsequent northern postglacial expansion following the receding laurentide and cordilleran ice sheets. the largest break (> 6 ... | 2000 | 10672160 |