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Molecular systematics of pikas (genus Ochotona) inferred from mitochondrial DNA sequences
Yu, N; Zheng, CL; Zhang, YP; Li, WH
2000-07-01
Source PublicationMOLECULAR PHYLOGENETICS AND EVOLUTION
Volume16Issue:1Pages:85-95
SubtypeArticle
AbstractThe phylogenetic relationships among worldwide species of genus Ochotona were investigated by sequencing mitochondrial cytochrome b and ND4 genes. Parsimony and neighbor-joining analyses of the sequence data yielded congruent results that strongly indicated three major clusters: the shrub-steppe group, the northern group, and the mountain group. The subgeneric classification of Ochotona species needs to be revised because each of the two subgenera in the present classification contains species from the mountain group. To solve this taxonomic problem so that each taxon is monophyletic, i.e., represents a natural clade, Ochotona could be divided into three subgenera, one for the shrub-steppe species, a second for the northern species, and a third for the mountain species. The inferred tree suggests that the differentiation of this genus in the Palearctic Region was closely related to the gradual uplifting of the Tibet (Qinghai-Xizang) Plateau, as hypothesized previously, and that vicariance might have played a major role in the differentiation of this genus on the Plateau, On the other hand, the North American species, O. princeps, is most likely a dispersal event, which might have happened during the Pliocene through the opening of the Bering Strait. The phylogenetic relationships within the shrub-steppe group are worth noting in that instead of a monophyletic shrub-dwelling group, shrub dwellers and steppe dwellers are intermingled with each other. Moreover, the sequence divergence within the sister tars of one steppe? dweller and one shrub dweller is very low. These findings support the hypothesis that pikes have entered the steppe environment several times and that morphological similarities within steppe dwellers were due to convergent evolution. (C) 2000 Academic Press.; The phylogenetic relationships among worldwide species of genus Ochotona were investigated by sequencing mitochondrial cytochrome b and ND4 genes. Parsimony and neighbor-joining analyses of the sequence data yielded congruent results that strongly indicated three major clusters: the shrub-steppe group, the northern group, and the mountain group. The subgeneric classification of Ochotona species needs to be revised because each of the two subgenera in the present classification contains species from the mountain group. To solve this taxonomic problem so that each taxon is monophyletic, i.e., represents a natural clade, Ochotona could be divided into three subgenera, one for the shrub-steppe species, a second for the northern species, and a third for the mountain species. The inferred tree suggests that the differentiation of this genus in the Palearctic Region was closely related to the gradual uplifting of the Tibet (Qinghai-Xizang) Plateau, as hypothesized previously, and that vicariance might have played a major role in the differentiation of this genus on the Plateau, On the other hand, the North American species, O. princeps, is most likely a dispersal event, which might have happened during the Pliocene through the opening of the Bering Strait. The phylogenetic relationships within the shrub-steppe group are worth noting in that instead of a monophyletic shrub-dwelling group, shrub dwellers and steppe dwellers are intermingled with each other. Moreover, the sequence divergence within the sister tars of one steppe? dweller and one shrub dweller is very low. These findings support the hypothesis that pikes have entered the steppe environment several times and that morphological similarities within steppe dwellers were due to convergent evolution. (C) 2000 Academic Press.
KeywordPhylogenetic-relationships
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Subject Area生物化学
WOS KeywordPHYLOGENETIC-RELATIONSHIPS
Indexed BySCI
Language英语
WOS Research AreaBiochemistry & Molecular Biology ; Evolutionary Biology ; Genetics & Heredity
WOS SubjectBiochemistry & Molecular Biology ; Evolutionary Biology ; Genetics & Heredity
WOS IDWOS:000088148400008
Citation statistics
Cited Times:79[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/1433
Collection中国科学院西北高原生物研究所
Affiliation1.Chinese Acad Sci, Kunming Inst Zool, Key Lab Cellular & Mol Evolut, Kunming 650223, Peoples R China
2.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China
3.Univ Chicago, Dept Ecol & Evolut, Chicago, IL 60637 USA
Recommended Citation
GB/T 7714
Yu, N,Zheng, CL,Zhang, YP,et al. Molecular systematics of pikas (genus Ochotona) inferred from mitochondrial DNA sequences[J]. MOLECULAR PHYLOGENETICS AND EVOLUTION,2000,16(1):85-95.
APA Yu, N,Zheng, CL,Zhang, YP,&Li, WH.(2000).Molecular systematics of pikas (genus Ochotona) inferred from mitochondrial DNA sequences.MOLECULAR PHYLOGENETICS AND EVOLUTION,16(1),85-95.
MLA Yu, N,et al."Molecular systematics of pikas (genus Ochotona) inferred from mitochondrial DNA sequences".MOLECULAR PHYLOGENETICS AND EVOLUTION 16.1(2000):85-95.
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