Abiotic Factors and Their Role in Phytoplankton Development in Reservoirs of the Middle Volga River, Russia

Минеева, Н. М.; Poddubny, S. A.; Stepanova, I. E.; Tsvetkov, A. I.

doi:10.1134/s1995082922060141

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…There is no doubt that, along with the thermal regime, factors such as the dynamics of water masses (flow and water level) and the content of nutrients (nitrates and phosphates) influence the development of phytoplankton. Therefore, it is difficult to agree with the statement that abiotic factors have little effect on the chlorophyll content in the Saratov Reservoir [8].…”

Section: Resultsmentioning

confidence: 95%

“…Cyanobacterial "blooming" of water is a global, multifactorial and dynamic process characteristic of surface water bodies [1,2,8,11]. Most clearly, the process of "blooming" of water manifests itself in hot, dry years and has a negative impact on the formation of water quality [4,13] and the state of aquatic biological resources [12,15].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the deterioration of water quality, there are risks of using reservoirs for domestic drinking water supply and fisheries. A large number of works are devoted to the study of phytoplankton in the Kuibyshev Reservoir [6,[9][10]18]. In hot and low-water years, the reservoir is characterized as a eutrophic reservoir, and in cold and high-water years -as a mesotrophic reservoir.…”

Section: Introductionmentioning

confidence: 99%

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Influence of weather conditions on the dynamics of summer phytoplankton in the Kuibyshev reservoir

Selezneva,

Seleznev

2024

E3S Web of Conf.

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Based on observation data in the summer of 2019 and 2021, an assessment was made of changes in abiotic characteristics and chlorophyll (Chl) content in the Kuibyshev Reservoir. Regular observations were carried out at the outlet section of the reservoir (Zhigulevsky hydroelectric complex) under conditions of complete mixing of water masses. The main goal of the study is to assess the influence of abiotic factors on the chlorophyll content and the mass development of cyanobacteria. It has been established that the main influencing factors are thermal regime and weather conditions. 2019 is characterized as “cold”. The total number of days with water temperatures above 22 °C was only 11. The degree of favorability was low (23 °C ˃ t ˃ 22 °C). 2021 characterized as “warm”. The total number of days with water temperatures above 22 °C was 72. The degree of favorability varied widely: from low (23 °C ˃ t ˃ 22 °C) to extreme high (t ˃ 26 °C). The most favorable year for the mass development of cyanobacteria was 2021, when the Chl content over the summer period was 7.2 μg/dm3. The least favorable year was 2019, when the Chl content was 1.4 μg/dm3. Seasonally, the temperature optimum was observed annually in July. The Chl content in July 2021 was 12.6 μg/dm3, and in July 2019 – 1.8 μg/dm3. Significant variability in chlorophyll content is due to synoptic cyclicity and changing weather conditions. The established influence of thermal regime and weather conditions on the content of chlorophyll suggests that in conditions of global warming, the process of mass development of cyanobacteria is expected to intensify, which will negatively affect the ecological state and water quality of the Kuibyshev Reservoir.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of weather conditions on the dynamics of summer phytoplankton in the Kuibyshev reservoir

Selezneva,

Seleznev

2024

E3S Web of Conf.

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

et al. 2023

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Abiotic Factors and Their Role in Phytoplankton Development in Reservoirs of the Middle Volga River, Russia

Cited by 6 publications

References 25 publications

Influence of weather conditions on the dynamics of summer phytoplankton in the Kuibyshev reservoir

Influence of weather conditions on the dynamics of summer phytoplankton in the Kuibyshev reservoir

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

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

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