Abstract
Mitochondrial DNA control region sequences were used to assess the genetic structure of Acrossocheilus paradoxus populations. An hierarchical examination of populations in 11 major streams from three geographical regions using an analysis of molecular variance (AMOVA) indicated high genetic differentiation both among populations (Φst =0.5680) and among regions (Φct =0.4110). Limited migration largely contributed to the genetic differentiation. High nucleotide diversity (0.0112) and haplotype diversity (0.97) were detected among population. The degree of gene flow was correlated with geographical distance between populations, a result consistent with limited dispersal being the primary determinant of genetic differentiation between populations. A Neighbor-Joining tree recovered by MEGA supported the pattern of isolation by distance and revealed a closer relationship between populations of central and south regions. A minimum spanning network based on nucleotide substitutions re f1ected migration routes from populations of central region to the north and south regions respectively
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