Abiotic Factors and Their Role in the Development of Phytoplankton in the Lower Volga

Mineeva, Natalya; Poddubny, S. A.; Stepanova, I. E.; Tsvetkov, A. I.

doi:10.1134/s1995082923010091

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…A combination of abiotic parameters (i.e., total nitrogen, total phosphorus, water temperature, transparency, color, electrical conductivity) affects the development of phytoplankton in reservoirs in different ways. Judging by coefficients of determination, the set of these factors determines the moderate variation in ∑CHL in the Ivankovo and Uglich reservoirs in the Upper Volga as well as the Volgograd reservoir in the Lower Volga (R 2 = 0.48-0.59) but significantly controls the development of phytoplankton in the Gorky, Cheboksary, and Kuibyshev reservoirs in the Middle Volga (R 2 = 0.71-0.75), and has little effect on phytoplankton in the Saratov reservoir (R 2 = 0.21) [57][58][59]. It can be assumed that the development of phytoplankton in the Volga reservoirs is differently regulated by habitat conditions in the reservoir-catchment system.…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll Content and Photosynthetic Activity of Phytoplankton in Reservoirs of the Volga River (Russia)

Минеева

Semadeni

2023

Phycology

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Using the fluorescent method in the modification of Krasnoyarsk State University, we studied the development (as chlorophyll content, ∑CHL) and photosynthetic activity of phytoplankton in seven large flat reservoirs of the Volga River cascade (Russia) in August 2015–2017. In the period of the maximal warming of water, average ∑CHL varied in limits of 19.4–33.7 μg L−1 in the Upper Volga, 8.5–27.8 μg L−1 in the Middle Volga, and 5.2–11.3 μg L−1 in the Lower Volga. The photosynthetic activity coefficient (PhAC) varied mostly in limits of 0.12–0.59, with an average of 0.22–0.38 and only in 2017 decreased to minimal < 0.10 and average < 0.20. The average PhAC values show the normal physiological state of the phytoplankton of the Upper Volga during all periods of observation, with an occasional decrease in PhAC in the Middle Volga and low photosynthetic activity in the Lower Volga. A decrease in the average ∑Chl and PhAC in 2017 was under cyclonic windy weather with a large amount of precipitation, low solar radiation, and large volume of flow. A trend towards a decrease in ∑CHL, like a decrease in PhAC from the Upper Volga to the Lower Volga, is explained by an increase in the flow rate and volume of runoff downstream of the Volga River.

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Section: Discussionmentioning

confidence: 99%

Chlorophyll Content and Photosynthetic Activity of Phytoplankton in Reservoirs of the Volga River (Russia)

Минеева

Semadeni

2023

Phycology

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Chlorophyll Content and Photosynthetic Activity of Phytoplankton in Reservoirs of the Volga River (Russia)

Минеева¹,

Semadeni²

2023

Preprint

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Using the fluorescent method in the modification of Krasnoyarsk State University, we study development (as chlorophyll content, ∑CHL) and photosynthetic activity of phytoplankton in seven large flat reservoir of the Volga River cascade (Russia) in August 2915–2017. In period of maximal warming of water, average ∑CHL varied in limits of 19.4–33.7 μg L–1 in the Upper Volga, 8.5–27.8 μg L–1 in the Middle Volga, and 5.2–11.3 μg L–1 in the Lower Volga. Photosynthetic activity coefficient (PhAC) varied mostly in limits of 0.12–0.59 with average of 0.22–0.38 and only in 2017 decreased to minimal <0.10 and average <0.20. The average PhAC values shows the normal physiological state of the phytoplankton of the Upper Volga during all periods of observation, occasional decrease of PhAC in the Middle Volga, and low photosynthetic activity in the Lower Volga. A decrease in the average ∑Chl and PhAC in 2017 was under cyclonic windy weather with a large amount of precipitation, low solar radiation, and large volume of flow. Trend towards a decrease in ∑CHL, like decrease in PhAC from the Upper Volga to the Lower Volga is explained by increasing in the flow rate and volume of runoff downstream the Volga River.

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Abiotic Factors and Their Role in the Development of Phytoplankton in the Lower Volga

Cited by 2 publications

References 12 publications

Chlorophyll Content and Photosynthetic Activity of Phytoplankton in Reservoirs of the Volga River (Russia)

Chlorophyll Content and Photosynthetic Activity of Phytoplankton in Reservoirs of the Volga River (Russia)

Chlorophyll Content and Photosynthetic Activity of Phytoplankton in Reservoirs of the Volga River (Russia)

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