Genetic diversity and population structure of Acrossocheilus yunnanensis (Teleostei, Cyprinidae) inferred from four mitochondrial gene sequences.

In this paper, we examine the genetic diversity, population structure and demographic history of Acrossocheilus yunnanensis inferred from four mitochondrial gene sequences. Twenty-two haplotypes were identified for A. yunnanensis. The total haplotype and nucleotide diversities of A. yunnanensis are 0.9206 and 0.024654, respectively. The monophyly of the haplotypes is supported by all phylogenetic analyses. All the haplotypes can be divided into four major lineages. The results of AMOVA and SAMOVA suggest that the best grouping pattern is to divide four groups, and that most of the variation of genetic divergence is present among these groups. The population expansion of A. yunnanensis is not supported by the analyses of population demography. Our results revealing the genetic background of A. yunnanensis will prove helpful in protecting its genetic diversity and utilizing this resource in a reasonable manner.