Fig. 2

a Phylogenetic tree based on Bayesian inference showing the relationships among Hemiculter leucisculus populations for the cytochrome b gene (Cytb). Values on branches indicate bootstrap proportions from a maximum likelihood analysis and Bayesian posterior probabilities. Numbers in bold and italic indicate divergence time estimates for Hemiculter leucisculus. H, Hainan island; J, Jiulongjiang River; L, Lingjiang River; M, Minjiang River; N, Nanpanjiang; Q, Qiangtangjiang River. b Median-joining network of Cytb sequences. Each colored circle represents different lineages, scaled according to its frequency in the entire sample. An empty circle indicates missing intermediate steps between observed haplotypes, and the numbers indicate mutation steps between haploptypes