Abstract
The purpose of this work is to study the interaction of morphologically similar forms of pidschianlike whitefishes of the Coregonus lavaretus complex inhabiting a limited area in the riverine-lacustrine system of the Bolshoy Abakan River basin. Sequences of the 16S-ND1 fragment of the mitochondrial DNA and the first intermediate transcribed spacer ITS1 of the nuclear DNA are determined. It is shown that whitefish populations differ based on the gill raker numbers and the complex of plastic traits. Analysis of the 16S-ND1 fragment of the mtDNA revealed several divergent lineages, which is confirmed by the study of the ITS1 of the nDNA. As a result, it is shown that the riverine-lacustrine system is inhabited by two genetically divergent whitefish populations. The results of the study support the hypothesis of multiple hybridization between slightly differentiated forms/populations of whitefishes during the postglacial period. As a result of the studies carried out, the hypothesis about the origin and possible ways of migration of some phylogenetic lineages of whitefishes in the water bodies of the Yenisei River basin is proposed.
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