Phylogenetic Study of the Genus Sinibrama (Pisces: Teleostei: Cyprinidae), With Their Evolutionary History in River Ecosystems of China

To explore the population dispersion pattern of Genus Sinibrama in the whole distribution area and to know about the evolution relationship among S. macrops, S. melrosei, S. taeniatus, S. longianalis, we studied the genetic structure and phylogenetic relationship of S. macrops from 7 basins, S. melrosei from 2 basins, S. taeniatus from 1 basin and S. longianalis from 1 basin based on partial sequence of mtDNA. Results indicated that, sequence divergence of mitochondrial control region varied from 3%-8% among them. The phylogenetic analyses showed that the Yangtze River was at the centre of evolutionary relationship among different populations, so the Yangtze River may be the origin centre of this Genus. Results of AMOVA, genetic differentiation index (Fst) and net genetic distance (Da) showed that homogeneous degree was higher in basins of Fujian and Zhejiang, population differentiation occurred in Qiantang River and Jiaoxi, and expansion time, network structure analysis showed Min River was the dispersal center in this area. The nested clade analyses showed the populations in Yangtze River experienced fragmentation and/or long-distance colonization, and indicated the river scale influence on the species differentiation pattern.