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Introgressive Hybridization between Southern Asian Dolly Varden, Salvelinus curilus, and Northern Dolly Varden, S. malma malma, on Sakhalin Island

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Abstract

Genetic characteristics of the southern Asian Dolly Varden, Salvelinus curilus, and northern Dolly Varden, S. malma malma, in northeastern Asia and the Aleutian Islands were examined using mitochondrial (mt) and microsatellite (ms) DNA markers. The maximum-likelihood tree based on mtDNA control region haplotypes showed two well-supported monophyletic lineages for these species, but the haplotypes found in the Sakhalin Island populations were an admixture of the two mtDNA lineages. Bayesian clustering using msDNA indicated that all individuals from Sakhalin Island grouped with the S. curilus populations, regardless of their mtDNA haplotype. Incongruence between mtDNA and msDNA markers provided strong evidence of historical mtDNA introgression from S. m. malma to S. curilus. Secondary contact by postglacial colonization from different refugia is a plausible explanation for the introgressive hybridization detected in Sakhalin Island.

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ACKNOWLEDGMENTS

We are grateful to Maki Yoshida, Atsuko Yada, and Shima Matsunaga for assistance with genetic analysis. We also thank Katsutoshi Watanabe for helpful discussion and comments.

Funding

This study was supported by JSPS KAKENHI grant number 16K07884.

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Authors and Affiliations

  1. Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 321-1661, Nikko, Tochigi, Japan

    S. Yamamoto

  2. Salmon Research Department, Fisheries Resources Institute, Japan Fisheries Research and Education, 062-0922, Sapporo, Hokkaido, Japan

    K. Morita & G. Sahashi

  3. Hokkaido University, 060-0809, Sapporo, Hokkaido, Japan

    K. Maekawa

  4. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, 690041, Vladivostok, Russia

    A. Oleinik, E. Bondar & V. Brykov

  5. Far Eastern Federal University, 690950, Vladivostok, Russia

    E. Bondar & V. Brykov

  6. Uryu Experimental Forest, Field Science Center for Northern Biosphere, Hokkaido University, 074-0741, Horokanai, Hokkaido, Japan

    K. Morita

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  1. S. Yamamoto
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Yamamoto, S., Morita, K., Sahashi, G. et al. Introgressive Hybridization between Southern Asian Dolly Varden, Salvelinus curilus, and Northern Dolly Varden, S. malma malma, on Sakhalin Island. Russ J Genet 57, 361–370 (2021). https://doi.org/10.1134/S1022795421030145

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