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Genetic diversity of trout (genus Salmo ) from its most eastern native range based on mitochondrial DNA and nuclear gene variation
Author(s) -
BERNATCHEZ L.,
OSINOV A.
Publication year - 1995
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/j.1365-294x.1995.tb00222.x
Subject(s) - biology , salmo , subspecies , brown trout , mitochondrial dna , trout , gene flow , genetic variation , genetic diversity , zoology , phylogenetic tree , evolutionary biology , ecology , population , fishery , genetics , gene , demography , sociology , fish <actinopterygii>
Russia and western Asia harbour trout populations that have been classified as distinct species and subspecies, most often on the basis of morphological and ecological variation. In order to assess their origins and to verify whether traditional taxonomy reflects their evolutionary distinctiveness, we documented their genetic relationships on the basis of mitochondrial DNA (mtDNA) RFLP, mtDNA sequence analysis, and allozyme variation. Both mtDNA and nuclear gene variation defined two ancient phylogenetic assemblages of populations distributed among northern (Baltic, White, Barents), and southern (Black, Caspian, Aral) sea basins, between which gene flow has been possible but limited in postglacial times. These results supported the traditional taxonomic differentiation between populations of these two regions. They provided weak support for the taxonomic distinction of southern brown trout ( Salmo trutta ) populations based on their basin of origin. They also refuted the hypothesis that L. Sevan trout ( Salmo ischchan ) diverged from a primitive brown trout ancestor. Nevertheless, all trout populations from southern sea basins possessed private alleles or mtDNA genotypes and were genetically distinct Therefore, they represent unique gene pools that warrant individual recognition for conservation and management.