Nucleotide diversity and divergence in the protein coding mitochondrial genes of Hucho taimen for the haplotype group 1 (A), haplotype group 2 (B), and full sample (C).

Note. – N, number of sites; S, number of polymorphic sites (singletons are in parentheses); π, average number of nucleotide differences per site among all pairs of sequences [65] obtained for the synonymous (Syn), nonsynonymous (Nsyn), and total number of sites; θ, average number of segregating nucleotide sites among all sequences, based on the expected distribution of neutral variants in a panmictic population at equilibrium [66]; h, number of haplotypes; Ktai-taiH, Ktai-ble, Ktai-len, and Ktai-len-t refer to the average proportion of nucleotide differences between our specimens of H. taimen and the GenBank H. taimen, H. bleekeri, B. lenok or B. lenok tsinlingensis, respectively. The H. taimen GenBank specimen from the Hutou range of the Ussuri River in Heilongjiang Province (GenBank HQ897271) is not considered in this analysis because it includes introgression events (see Results).