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Exploring factors shaping population genetic structure of the freshwater fish Sinocyclocheilus grahami (Teleostei, Cyprinidae)
Author(s) -
Chen S.Y.,
Zhang R.D.,
Feng J.G.,
Xiao H.,
Li W.X.,
Zan R.G.,
Zhang Y.P.
Publication year - 2009
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2009.02204.x
Subject(s) - biology , clade , cyprinidae , population , isolation by distance , genetic divergence , ecology , genetic structure , structural basin , phylogenetic tree , evolutionary biology , zoology , genetic variation , fishery , genetic diversity , fish <actinopterygii> , paleontology , genetics , gene , demography , sociology
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 Φ 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.