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A Revision of the Genus Agarum (Laminariaceae, Phaeophyceae) from the Far Eastern Seas with a Description of Agarum undulatum sp. nov. from the Kuril Islands

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Abstract

A revision of the species composition of the genus Agarum from the Far Eastern seas is based on specimens collected personally by the authors, those deposited at the LE and SAP herbaria, and also obtained during the expeditions of the Zhirmunsky Institute of Marine Biology FEB RAS and SakhalinNIRO to the Kuril Islands. A multigene analysis using the rbcL + cox1 and ITS2 + rbcL+cox1 sequences has shown that the genus Agarum comprises three species. Two of them, A. clathratum Dumortier and A. turneri Postels et Ruprecht, were previously reported from the Asian algal flora. The third species, A. undulatum sp. nov., is here described as new to science. It differs from A. clathratum in ITS2 + rbcL + cox1 by 5.51%; from A. turneri, by 7.5%. The new species, growing in habitats with depths of 15–43 m, is widely distributed in waters along the middle Kuril Islands and the Lesser Kuril Chain. In the phylogenetic tree, A. clathratum splits into two clades, of which one includes specimens belonging to the type form of this species, and the other includes specimens having traits of A. yakishiriense. The difference between the two clades in ITS2 + rbcL + cox1 constitutes only 1.7%. This allows considering A. yakishiriense as a subspecies of A. clathratum. In waters of the Russian Far Eastern seas, it is found in the Sea of Japan and the southern Sea of Okhotsk.

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ACKNOWLEDGMENTS

We are grateful to N.K. Khristoforova (Dr. Sci. Biol., Far Eastern Federal University), who provided us with the collection of algae gathered in 1986 during the hydrobiological expedition conducted by the Zhirmunsky Institute of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, off the Kuril Islands. We also thank our colleagues, phycologists V.N. Kulepanov (Cand. Sci. Biol.) and L.A. Balkonskaya (Cand. Sci. Biol.), who provided specimens of Agarum algae from the collections of the Pacific Research Fisheries Center and its Sakhalin branch for our study.

Funding

The study was supported by the Russian Foundation for Basic Research (research project no. 19-04-00285 A).

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Authors and Affiliations

  1. Kamchatka State Technical University, 683003, Petropavlovsk-Kamchatsky, Russia

    T. A. Klochkova, A. V. Klimova & N. G. Klochkova

  2. Field Science Center for Northern Biosphere, Hokkaido University, 060-0809, Sapporo, Japan

    N. Yotsukura

Authors
  1. T. A. Klochkova
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  2. A. V. Klimova
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  3. N. Yotsukura
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  4. N. G. Klochkova
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Correspondence to T. A. Klochkova.

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The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Klochkova, T.A., Klimova, A.V., Yotsukura, N. et al. A Revision of the Genus Agarum (Laminariaceae, Phaeophyceae) from the Far Eastern Seas with a Description of Agarum undulatum sp. nov. from the Kuril Islands. Russ J Mar Biol 47, 364–372 (2021). https://doi.org/10.1134/S1063074021050059

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