| diversification of the alpine chipmunk, tamias alpinus, an alpine endemic of the sierra nevada, california. | the glaciation cycles that occurred throughout the pleistocene in western north america caused frequent shifts in species' ranges with important implications for models of species divergence. for example, long periods of allopatry during species' range contractions allowed for the accumulation of differences between separated populations promoting lineage divergence. in contrast, range expansions during interglacial periods may have had homogenizing effects via increased gene flow following seco ... | 2014 | 24559294 |