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Species Diversity of Phototrophic Picoplankton in the Kara and Laptev Seas

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Abstract

Species diversity of phototrophic eukaryotes (PEs) with cell size <3 µm in autumn phytoplankton of the Kara and Laptev seas was studied. High-throughput sequencing of the 18S rRNA gene V4 region revealed 15 classes of algae in the plankton pico-sized fraction, which belonged to five divisions: Haptophyta, Cryptophyta, Chlorophyta, Ochrophyta, and Dinoflagellata. Dinoflagellata and green algae of the class Mamiellophyceae were the main contributors to total PE sequences. Chlorophyta was the most diverse section, represented by seven classes: Mamiellophyceae, Trebouxiophyceae, Nephroselmidophycea, Palmophyllophyceae, Pyramimonadophyceae, Chlorodendrophyceae, and Chlorophyceae. Bolidophyceaea species Triparma strigata and T. laevis, as well as the diatom Skeletonema marinoi, were first identified in the Kara and Laptev Seas, respectively. The hydrological conditions on the stations determined the PE taxonomic composition. The diversity indices were higher at the stations located in the upper estuary of river Khatanga and at the areas of both seas adjacent to the Khatanga and Ob estuaries than at the northernmost Laptev Sea station. The obtained data showed that the taxonomic composition of the smallest phytoplankton fraction of the two shelf seas of the Russian Arctic was similar to that found in other Arctic regions.

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Funding

The work was carried out within the framework of the State Assignment of the Lomonosov Moscow State University part 2 (topic nos. 121032300135-7 and АААА-А17-117120540067-0) and of the Future of the Planet and Global Environmental Changes Program for Development of Interdisciplinary Scientific and Educational School of the Moscow State University and was supported by the Russian Foundation for Basic Research, project no. 19-05-00026.

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Correspondence to T. A. Belevich.

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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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Translated by P. Sigalevich

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Belevich, T.A., Milyutina, I.A. Species Diversity of Phototrophic Picoplankton in the Kara and Laptev Seas. Microbiology 91, 67–76 (2022). https://doi.org/10.1134/S0026261722010027

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  • DOI: https://doi.org/10.1134/S0026261722010027

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