Abstract
The research is based on the materials collected during cruise 66 of R/V Akademik Mstislav Keldysh in the Yenisei estuary and over the adjacent Kara Sea shelf in the latitudinal range from 71°50.5′ to 75°55.0′ N. The studies were performed from July 25 to 27, 2016, three weeks after the end of the flood period. Two hundred fifty species of plankton algae were recorded. Well-pronounced latitudinal zoning in phytoplankton communities structure associated with changes in the hydrophysical and hydochemical conditions of the pelagic environmental was determined. The maximum species diversity was formed by diatoms, green and blue-green algae in the southern desalinated part of the estuary (<1 PSU) and by diatoms and dinoflagellates in the offshore areas. The highest algae abundance and biomass, 2.7–2.9 × 106 cell/L and 1.1–1.5 g/m3, respectively, were recorded in the inner desalinated part of the estuary, where freshwater diatoms of the genus Aulacoseira dominated. The distribution of freshwater algae northwards was bounded by the 12–15 PSU surface isohaline (74°20′ N). The most pronounced decline in phytoplankton abundance and biomass was found in the outer part of the estuary north of ~73° N. In the middle shelf to the north of the Yenisei estuary, the maximum abundance (up to 740 × 103 cell/L) and biomass (up to 240 mg/m3) of phytoplankton were recorded at the depths of 30–40 m with low illumination and high nutrient concentration, which was also typical of the Ob region in spring–summer.
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ACKNOWLEDGMENTS
We thank A.B. Demidov for providing the data on the boundary of the photosynthetic layer, concentrations of chlorophyll and pheophytin and T.A. Kuzmichev for assistance in collecting and preparing phytoplankton samples. We would like to thank the anonymous reviewer for detailed analysis of the manuscript.
Funding
The study was conducted within a state task, topic no. 149-2019-0008. Processing of phytoplankton samples and computer analysis of the primary material were supported by the Russian Foundation for Basic Research, project no. 18-05-60069 Arctic. Hydrochemistry data were obtained with the support of the Russian Science Foundation, project no. 19-17-00196.
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Translated by N. Ruban
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Sukhanova, I.N., Flint, M.V., Sakharova, E.G. et al. Structure of Phytocenoses of the Yenisei Estuary and Adjacent Kara Sea Shelf in Late Spring. Oceanology 60, 748–764 (2020). https://doi.org/10.1134/S0001437020060107
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DOI: https://doi.org/10.1134/S0001437020060107