| testing hypotheses of pleistocene population history using coalescent simulations: phylogeography of the pygmy nuthatch (sitta pygmaea). | in this paper, we use mitochondrial nadh dehydrogenase subunit 2 sequences to test pleistocene refugial hypotheses for the pygmy nuthatch (sitta pygmaea). pygmy nuthatches are a common resident of long-needle pine forests in western north america and demonstrate a particular affinity with ponderosa pine (pinus ponderosa). palaeoecological and genetic data indicate that ponderosa pine was isolated in two pleistocene refugia corresponding to areas in the southern sierra nevada in the west and sout ... | 2006 | 17015345 |