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Graylings (Thymallidae) of water bodies in western Mongolia: Morphological and genetic diversity

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Abstract

Morphological characters, the pattern on the dorsal fin, some biological parameters, and variations of mtDNA control region were studied in graylings of the upper reaches of the Khovd River (western Mongolia). Obtained results demonstrated that grayling of this part of the river was presented by great (predatory) and small (benthophagous) forms of Mongolian grayling Thymallus brevirostris. The last form was erroneously equated to Arctic grayling Thymallus arcticus. However, genetic unity of great and small forms, homogeneity by meristic characters, and similarity in varying the color of scales and pattern on the dorsal fin attest their belonging to the same species. Water bodies of the Central Asian basin are also populated with populations of Mongolian grayling with mixed type of feeding and signs of external structure, which are typical for both forms in a different degree.

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Correspondence to I. B. Knizhin.

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Original Russian Text © I.B. Knizhin, S.J. Weiss, B.E. Bogdanov, T. Kopun, O.V. Muzalevskaya, 2008, published in Voprosy Ikhtiologii, 2008, Vol. 48, No. 6, pp. 745–766.

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Knizhin, I.B., Weiss, S.J., Bogdanov, B.E. et al. Graylings (Thymallidae) of water bodies in western Mongolia: Morphological and genetic diversity. J. Ichthyol. 48, 714–735 (2008). https://doi.org/10.1134/S0032945208090038

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