Abstract
According to 2001–2019 field observations, significant negative trends in the content of allochthonous and total organic matter and mineral nitrogen have been recorded in the Volgograd Reservoir. Winter warming has led to an increase in the volume of waters rich in humic organic matter, which has caused an increase in the water color index and iron content. The increase in the intensity of bioproduction processes against the background of higher water temperature has contributed to a growth in the proportion of easily oxidized fractions of organic matter compared to the initial period of the reservoir existence. A trend towards the simplification of the phytoplankton community along with the negative trend for the total biomass and main dominant groups (diatoms, cyanoprokaryotes, and green algae) has been observed in the first two decades of the 21st century. The ratio of phytoplankton functional groups has changed: the proportion of diatoms has decreased against the background of an increase in the proportion of Cyanoprokaryota and mixotrophic phytoflagellates. The dimensional characteristics have decreased and the seasonal dynamics of biomass has changed from the prevailing spring maximum of diatoms to the prevailing summer maximum of cyanoprokaryotes. The transformation of the phytoplankton community results from changes in the regime of biogenic elements and organic matter due to climatic transformation and successional processes.
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ACKNOWLEDGMENTS
We are grateful to I.G. Filimonova, L.V. Grishina, and E.G. Kuzina for their active participation in treating the hydrochemical material, as well as V.P. Ermolin† and V.B. Rudenko-Travin for providing long-term data on the hydrological and thermal regimes of the reservoir and all members of the Saratov Branch of the Russian Federal Research Institute of Fisheries and Oceanography for assistance in sampling.
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This study was performed as part of State Task no. 076-00005-20-02.
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Translated by D. Zabolotny
Abbreviations: PB, phytoplankton biomass; OM, organic matter; PO, permanganate oxidizability; COD, chemical oxygen demand; BOD5, biochemical oxygen demand for 5 days of exposure.
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Shashulovskaya, E.A., Mosiyash, S.A. & Dalechina, I.N. Long-Term Changes in the Main Indicators of the Trophic State of the Large Plain Reservoir under the Influence of Climatic Transformation and Successional Processes. Inland Water Biol 14, 627–637 (2021). https://doi.org/10.1134/S1995082921060110
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DOI: https://doi.org/10.1134/S1995082921060110