Abstract—
The morphological variability of nine characters in six samples of Siberian taimen Hucho taimen from the Amur River was studied. The differences in the level of fluctuating asymmetry of fish from different tributaries are small, which indicates the similarity of the conditions of embryonic and early postembryonic development; significant differences between the samples were noted only in six cases. The maximum fluctuations in the coefficient of variation are characteristic for the number of postorbital bones and channels of the seismosensory system on the 1st postorbital bone; the minimum, for the number of soft rays in the pectoral fins and channels of the seismosensory system on the preopercular bones. The largest sum of the variation coefficients values for individual characteristics differs in the sample from the Bikin River; the smallest, the Limuri River. These difference positively correlates with the length and area of the basin of these tributaries. A regular decline in the mean values in the fish sampled at increasing distance from the mouth of the Amur River concerns only the number of postorbital bones. Clustering according to the mean values of the features, revealed that the samples form three clusters: (1) the rivers Bol’shaya Ussurka and Tyrma (2nd order tributaries, the farthest from the Amur mouth), (2) the Limuri River (the least distant from the Amur mouth), 3) the rivers Anyui, Khor and Bikin (geographically close populations). Revealed features may indicate the similarity of the conditions of early development and the likelihood of gene exchange between the last three groups.
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ACKNOWLEDGMENTS
We are grateful to G.V. Novomodny, D.V. Kotsyuk, T.V. Mironova, A.P. Shmigirilov, V.V. Kharitonov, I.V. Kharitonov, R.A. Ershov, A.K. Kalyundzyuga, A.S. Sigde (Khabarovsk NIRO) and E.I. Barabanshchikov (TINRO) for assistance in sampling.
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Romanov, N.S., Mikheev, P.B. Variability of Siberian Taimen Hucho taimen (Salmonidae) of The Amur River. J. Ichthyol. 60, 858–867 (2020). https://doi.org/10.1134/S0032945220060089
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DOI: https://doi.org/10.1134/S0032945220060089