Molecular Systematics of Pikas (Genus Ochotona) Inferred from Mitochondrial DNA Sequences

Phylogeny and biogeography of Chinese sisorid catfishes re-examined using mitochondrial cytochrome b and 16S rRNA gene sequences

“…Geological studies indicated that the uplift events of the Qinhai-Tibetan Plateau occurred more strongly and frequently from 3.4 Myr ago (Yu et al, 2000;and references therein). The rich geological and ecological diversity of the Qinhai-Tibetan Plateau, together with habitat isolation due to changing climatic conditions during the third uplift of the Plateau, may have promoted rapid speciation in small, isolated populations, thus allowing the fixation of derived morphological characters.…”

Phylogenetic relationships of glyptosternoid fishes (Siluriformes: Sisoridae) inferred from mitochondrial cytochrome b gene sequences

“…As suggested by some authors (Chu, 1979;He, 1995), the uplift of Qinghai-Tibet Plateau played a primary role in the speciation of glyptosternoids. Geological studies indicated that the uplift events of the Qinghai-Tibet Plateau occurred more strongly and frequently since 3.4 myr ago (Yu et al, 2000; and references therein), The rich geological and ecological diversities of the QinghaiTibet Plateau, together with habitat isolation due to changing climatic conditions during the uplift of the plateau, might well promote rapid speciation in small, isolated population, thus, allowing the fixation of peculiar morphological characters. We noted that all glyptosternoid fishes were not easily distinguished from each other, although many distinctive features were defined and the genetic distances among them were high.…”

Discovery of New Ohbayashinema spp. (Nematoda: Heligmosomoidea) in Ochotona princeps and Ochotona cansus (Lagomorpha: Ochotonidae) From Western North America and Central Asia, with considerations of Historical Biogeography

“…Within these parasite taxa, biogeographic distributions for most species are partitioned between the Palearctic and Nearctic, with little indication that single species of nematodes have broad ranges in the Holarctic. Similar to species of Graphidiella and Murielus, those of Ohbayashinema are distributed among all recognized subgroups of pikas including shrub-steppe, mountain, and northern forms (Yu et al, 2000;. Murielus was found in a member of the shrub-steppe group, Oc.…”

“…patriciae in Oc. cansus) subgroups of Ochotona (Yu et al, 2000). Geographically, however, these species of Ochotona may be sympatric in some areas of west-central China (Smith et al, 1990).…”