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Heterotrophic Nanoflagellates in the Pelagic Zone and Sediments of the Eastern Laptev Sea

  • MARINE BIOLOGY
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Oceanology Aims and scope

Abstract—

For the first time, the species composition of heterotrophic nanoflagellates, their quantitative characteristics, and abundance and biomass of their main food objects—bacteria and picophytoplankton, were determined in the water column and sediments of the Laptev Sea. In early autumn, an increase in the number and biomass of planktonic flagellates was recorded on a meridional transect from the Lena River delta to the deep-sea zone in the area of the internal shelf impacted by freshwater input from the Lena River. The pattern of the vertical distribution of planktonic flagellates differed in different parts of the sea, but everywhere their largest number was confined to either the surface or near-bottom layers. The quantitative parameters of planktonic flagellates correlated positively with the temperature, bacterial abundance, and biomass, and negatively correlated with water salinity. The abundance and biomass of heterotrophic flagellates in surface sediments was three to four orders of magnitude higher than in the water column and exceeded those of planktonic flagellates at shallow sites under 1 m2. A total of 28 species and forms of heterotrophic flagellates have been identified. Representatives of two taxonomic groups—Kinetoplastea and Stramenopiles, the most tolerant to the salinity—dominated in the community. The species richness of the flagellates decreased with water depth, it was minimum in less saline coastal waters, and it increased in the deep-sea area.

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Funding

This study was performed with a state task (project no. АААА-А18-118012690098-5). Expeditionary studies were supported by the Russian Science Foundation (project no. 14-50-00095); laboratory processing of samples and primary materials was partially supported by the Russian Foundation for Basic Research (project no. 18-05-00326).

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Authors and Affiliations

  1. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742, Borok, Nekouzskii raion, Yaroslavl oblast, Russia

    N. G. Kosolapova, D. B. Kosolapov, A. I. Kopylov & A. V. Romanenko

  2. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117218, Moscow, Russia

    N. G. Kosolapova & A. V. Romanenko

  3. Cherepovets State University, 162600, Cherepovets, Vologda oblast, Russia

    D. B. Kosolapov

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  1. N. G. Kosolapova
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  2. D. B. Kosolapov
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  3. A. I. Kopylov
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  4. A. V. Romanenko
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Correspondence to N. G. Kosolapova.

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Translated by N. Ruban

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Kosolapova, N.G., Kosolapov, D.B., Kopylov, A.I. et al. Heterotrophic Nanoflagellates in the Pelagic Zone and Sediments of the Eastern Laptev Sea. Oceanology 59, 881–892 (2019). https://doi.org/10.1134/S0001437019060092

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