Abstract
The habitation of the Upper Lena form of grayling in the upper reaches of the Tiya (the northwestern tributary of Lake Baikal) and Barguzin rivers, where Baikal grayling Thymallus baicalensis Dyb. also occurs, was established. The listed forms can be diagnosed from the body coloration, dorsal fin pattern, combination of meristic characters, as well as by molecular-genetic methods. The sympatric habitation of the Upper Lena and Baikal graylings in the northern tributaries of Baikal, considerable phenotypic and genetic differences, as well as the absence of individuals with intermediate characters, make it possible to consider them as independent species. The results indicate the need to revise the intraspecies structure of the Arctic grayling T. arcticus (Pall.) and the entire genus Thymallus. The localization of populations of the Upper Lena grayling in the upper reaches of Baikal tributaries testifies to its possible penetration of the Baikal basin by means of temporary river catchments that formed in the past and which are probable at present at watersheds with the Lena River. A wider distribution of this form is apparently hindered by the pressure of aboriginal species.
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Original Russian Text © I.B. Knizhin, S.J. Weiss, B.E. Bogdanov, T. Kopun, 2008, published in Voprosy Ikhtiologii, 2008, Vol. 48, No. 2, pp. 166–172.
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Knizhin, I.B., Weiss, S.J., Bogdanov, B.E. et al. New data on the distribution of the Upper Lena form of grayling (Thymallidae) in the basin of Lake Baikal and its taxonomic status. J. Ichthyol. 48, 217–223 (2008). https://doi.org/10.1134/S003294520803003X
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DOI: https://doi.org/10.1134/S003294520803003X