Heterotrophic Nano- and Microplankton in the Kara Sea in Autumn

A. F. Sazhin; Сажин А. Ф.; N. D. Romanova; Романова Н. Д.; A. I. Kopylov; Копылов А. И.; A. V. Romanenko; Романенко А. В.; E. A. Zabotkina; Заботкина Е. А.

doi:10.31857/S0030157423020119

Heterotrophic Nano- and Microplankton in the Kara Sea in Autumn

Authors: Sazhin A.F.¹, Romanova N.D.¹, Kopylov A.I.², Romanenko A.V.², Zabotkina E.A.²
Affiliations:
1. Shirshov Institute of Oceanology, Russian Academy of Sciences
2. Papanin Institute of Biology of Inland Waters, Russian Academy of Sciences
Issue: Vol 63, No 2 (2023)
Pages: 243-254
Section: Морская биология
URL: https://journals.rcsi.science/0030-1574/article/view/136238
DOI: https://doi.org/10.31857/S0030157423020119
EDN: https://elibrary.ru/NQOHAH
ID: 136238

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Abstract

Based on the obtained and all available literature data, it has been shown that the abundance of heterotrophic flagellates in the Kara Sea at the end of the season is relatively stable in different years, while in other Arctic seas (East Siberian and Chukchi Seas) the described values of this indicator are 1.5–2 times higher. The indicators of the abundance of heterotrophic nanoflagellates in the bottom water vary to a much lesser extent than in the water column. The abundance of heterotrophic nanoflagellates in the bottom water of the bays of the Novaya Zemlya archipelago is significantly lower than in the same biotopes in the eastern and western parts of the Kara Sea. Most organisms are free-living forms. About a third of the protozoa are associated with detritus particles. The ratio of the biomass of heterotrophic flagellates to the biomass of bacteria more than doubles in the layer of bottom water and in the upper layer of sediments compared to the water column. For the water column of the Kara Sea, the calculated value of grazing of bacterioplankton by flagellates does not exceed 2% of their biomass. The ratio of the eaten biomass of bacterioplankton to the biomass of consumers in most cases decreases with depth.

Keywords

heterotrophic nanoflagellates, microplankton, water column, bottom water, upper layer of sediments, Kara Sea

References

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