2023 Ecosystem Transformation 6 (2), 19–32
Spatial distribution and photosynthetic activity of phytoplankton in the Rybinsk Reservoir in the summer period of 2018–2020
Ivan V. Semadeni
DOI: https://doi.org/10.23859/estr-220414Volume: 6
Number: 2
Pages: 19–32
Received: 14.04.2022
Accepted: 01.07.2022
Available online: 12.04.2023
Published: 15.06.2023
ISSN 2619-094X Print
ISSN 2619-0931 Online
The spatial distribution of chlorophyll a (Chl a) and photosynthetic activity coefficient (PAC) of phytoplankton in the Rybinsk Reservoir was studied using fluorescent analysis in July–August 2018–2020. Under various hydrometeorological conditions, the content of Chl a varied as 0.26–116 μg/L, averaging 16.7–21.2 μg/L. The spatial distribution of Chl a in 2019 was characterized by moderate patchiness, in 2018 and 2020, by highly pronounced randomity (coefficients of variation Cv = 69, 91, and 140%, respectively). The PAC varied from 0.01 to 0.58, averaging 0.30–0.42. PAC below 0.3 were noted in 8–47% of cases, reflecting the development of phytoplankton under stressful conditions. The spatial distribution of PAC was more uniform than that of Chl a (Cv = 18–130%). PAC depended on Chl a content non-linearly (R2 = 0.50).
Ivan V. Semadeni
Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences
Borok 109, Nekouz District, Yaroslavl Region, 152742 Russia
semadeni14@mail.ru
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Keywords: chlorophyll, PAC, quantum yield, monitoring, fluorescence, Upper Volga River, algocoenosis state, pigments
For citation: Semadeni, I.V., 2023. Spatial distribution and photosynthetic activity of phytoplankton in the Rybinsk Reservoir in the summer period of 2018–2020. Ecosystem Transformation 6 (2), 19–32. https://doi.org/10.23859/estr-220414