期刊
JOURNAL OF FISH BIOLOGY
卷 74, 期 8, 页码 1774-1786出版社
WILEY
DOI: 10.1111/j.1095-8649.2009.02204.x
关键词
geographical isolation; mtDNA; population structure; Sinocyclocheilus grahami
资金
- National Basic Research Programme of China [2007CB411600]
- National Natural Science Foundation of China
- Bureau of Science and Technology of Yunnan Province
Phylogeographical analyses on Sinocyclocheilus grahami samples from seven localities within the Lake Dianchi Basin in China were conducted to explore the main factors shaping population structure within this species. Phylogenetic and network analyses revealed two major clades in 24 mtDNA haplotypes. One clade included three haplotypes exclusively from samples of the lower basin and another clade encompassed other haplotypes from samples of the upper basin. The estimated divergence time between the two clades predated the river capture event connecting the lower and upper lake basin and thus supported geographical isolation as the main factor shaping genetic divergence between these two clades. Furthermore, analysis of molecular variance and pair-wise Phi(ST) distances revealed significant genetic differentiation within the upper basin. Mantel tests clearly supported patterns of differentiation arose purely as a result of isolation by distance. These results further highlight the importance of geographical isolation in shaping differentiation within this species.
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