Analysis of mtDNA variation in one of the amphidromic Far Eastern redfins, Tribolodon hakonensis, revealed the presence of three considerably genetically different mtDNA phylogroups in the individuals from the Russian part of the range. These data suggest the presence of the two periods of divergent evolution in the history of the species examined. Comparison of the haplotype distributions from different phylogroups over the species range revealed geographic localization of only one phylogroup in the population samples from southern continental coastal regions of the Sea of Japan. At the same time, two other phylogroups were found in almost equal ratios in northern continental samples and near the Sakhalin Island. These results suggest that the first stage of the divergent evolution, which occured between Pliocene and Pleistocene, resulted in the formation of genetically isolated form (probably, a species) in the region of the Sea of Japan. The second, later period of divergence, probably associated with the separation of the Sea of Okhotsk from the Pacific Ocean then ended with the integration of earlier genetically separated forms into one species with the common gene pool.
Russian Journal of Genetics – Springer Journals
Published: Nov 11, 2011
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