Phylogeny of Salmonoid Fishes (Salmonoidei) Based on mtDNA COI Gene Sequences (Barcoding)
V. S. ARTAMONOVA1,2, O. V. KOLMAKOVA2, E. A. KIRILLOVA1, A. A. MAKHROV1,2
1Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071, Moscow, Leninsky ave., 33
2Institute of Biophysics of Federal Research Center, 660036, Krasnoyarsk, Akademgorodok, 50/50
Keywords: эволюция, сеть, молекулярные часы, аминокислотная последовательность, репродуктивная изоляция, иммобилизация, рыбы, evolution, network, molecular clock, amino acid sequence, reproductive isolation, immobilization, fishes
Abstract
We analyzed the partial sequences of the mitochondrial COI gene along with the amino acid sequences of the subunit I of cytochrome oxidase, encoded by this gene region, in representatives of 11 genera of salmonoid fish. For amino acid sequences, two alternative networks were constructed with outgroups represented by either Esocoidei or Osmeroidei as the supposed ancestral groups. In this way, Osmeroidei appear to be closer to the salmonoid fish than Esocoidei, and their presence in the network as an outgroup explains much better the available data on the morphology and karyology of salmonoids. A number of the results of this study are fundamentally new. In particular, slowing down of the molecular evolution of grayling (Thymallidae) is shown. We conclude that char ( Salvelinus ) is the closest to the ancestor modern genus of salmonoids. The hypothesis of the phylogenetic proximity of the genera Brachymystax, Hucho and Salmo has been confirmed. We also discuss the possibility of namely the changes in the amino acid sequence of the cytochrome oxidase subunit I may lead to postzigotic reproductive isolation between taxa.
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