Abstract―
The spatial distribution of picocyanobacteria at the arctic longitude section passing through the shelf of the Kara, Laptev, and East Siberian seas from 58° to 168° E was studied. The average abundance of picocyanobacteria was 0.48 ± 1.2 × 109 cells/m3 in the Kara Sea, 0.16 ± 0.24 × 109 cells/m3 in the Laptev Sea, and 0.25 ± 0.43 × 109 cells/m3 in the East Siberian Sea. The fluctuations of picocyanobacterial abundance were determined by their presence in allochthonous sources: river flow and transformed North Atlantic waters. The highest abundance was observed in the areas of the runoff influence of the Ob, Khatanga, Indigirka, and Kolyma Siberian rivers: 0.5 × 109, 0.2 × 109, 0.4 × 109, and 1.6 × 109 cells/m3, respectively. The average contribution of picocyanobacteria to the total abundance and biomass of picophytoplankton in the western part of the Kara Sea was 37 and 36%, respectively. In other regions, the average contribution of picocyanobacteria to the total abundance and biomass of phototrophic picoplankton did not exceed 7 and 6%, respectively. A highly reliable (p\( \ll \) 0.01) positive correlation between the abundance and biomass of picocyanobacteria and the water temperature (p = 0.003) was revealed in the entire dataset obtained.
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Funding
This study was carried out as part of the State Task of Moscow State University, part 2 (topic no. AAAA-A16-116021660052-0). The Russian Foundation for Basic Research supported expeditionary research (project no. 18-05-60069 Arctic) and processing and analysis of the results (project no. 19-05-00026а).
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Belevich, T.A., Il’yash, L.V., Chul’tsova, A.L. et al. The Spatial Distribution of Plankton Picocyanobacteria on the Shelf of the Kara, Laptev, and East Siberian Seas. Moscow Univ. Biol.Sci. Bull. 74, 194–199 (2019). https://doi.org/10.3103/S0096392519040011
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DOI: https://doi.org/10.3103/S0096392519040011