Abstract
The research was done on the basis of monthly samples collected by sediment trap exposed over the outer shelf of the Kara Sea from September 2018 to July 2019. Vertical fluxes of phytoplankton and its dominating components, as well as tintinnids and stinging cells of coenenterates, were evaluated. The maximum phytoplankton sedimentation, in which large-size centric diatoms dominated, was observed in May and associated with the formation of spacious polynya in seasonal ice cover. The maximum number of phytoplankton reached 6.5 × 106 cells/m2/day, the wet biomass was 17.7 mg/m2/day, and the carbon biomass was 1.17 mgС/m2/day. The vertical flux of particulate organic matter (POM) was low (4.1 mgС/m2/day), and the phytoplankton contribution to POM reached its maximum of 28.5% for the whole observation period. High numbers and biomass of phytoplankton with domination of species typical for ice blooms were registered in the June sample in the period of seasonal ice melting. The minimal values of algae abundance in sediment samples were observed from January to April. With the exception of May, the share of phytoplankton in POM did not exceed 3%. The numbers of tintinnids were highest in September–November, and those of stinging cells of coenenterates from September to December and in May. In autumn months, the contribution of tintinnids to POM was comparable with that of phytoplankton.
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ACKNOWLEDGMENTS
The authors are grateful to F.V. Sapozhnikov for photographs of siphonophore stinging cells and to the anonymous reviewer for comments on the manuscript.
Funding
This work was carried out within the framework of state assignments nos. FMWE-2021-0007 (processing of field material) and FMWE-2022-0003 (preparation of the article). Expeditionary research was carried out with the targeted financial support of the Ministry of Science and Higher Education of the Russian Federation.
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Sukhanova, I.N., Flint, M.V. Seasonal Dynamics of Vertical Fluxes of Phytoplankton, Tintinnids, and Stinging Cells of Coelenterates in the Kara Sea. Oceanology 62, 773–782 (2022). https://doi.org/10.1134/S0001437022060121
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DOI: https://doi.org/10.1134/S0001437022060121