Genetic variations and population structure in three populations of beardless barb, Cyclocheilichthys apogon (Valenciennes, 1842) inferred from mitochondrial cytochrome b sequences

AbstractThis study aimed to investigate the relation of dispersal barrier and genetic diversity, population structure, and demographic history of 46 samples of beardless barb, Cyclocheilichthys apogon (Valenciennes, 1842) collected from three different locations in North-eastern Thailand. The analysis of molecular variance (AMOVA) was employed in order to determine the genetic variability within and among populations of this fish. The neutrality tests and mismatch distribution analysis were additionally applied to assess the neutrality and demographic expansion of the populations, respectively. Contiguous sequences within range from 1100 to1140 bp were obtained with varying 16 different haplotypes with high-haplotype diversity (0.8773 ± 0.0327) and low-nucleotide diversity (0.00215 ± 0.00020). The variations within and among populations accounted for 98.98 and 1.02% of the total variation, respectively. The low level of pairwise Fst estimations indicated a possible gene flow among populations and a sugges...