Cite this article as:

Voronin M. Y. Long-Term Monitoring of Macrozoobenthos in the Reservoir-Cooler of Balakovo NPP. Izvestiya of Saratov University. New series. Series: Chemistry. Biology. Ecology, 2019, vol. 19, iss. 4, pp. 461-472. DOI: https://doi.org/10.18500/1816-9775-2019-19-4-461-472


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Russian

Long-Term Monitoring of Macrozoobenthos in the Reservoir-Cooler of Balakovo NPP

Abstract

For 8 years (2011–2018) macrozoobenthos samples were taken at the permanent stations in the reservoir-cooler of Balakovo NPP. Sampling stations were located in a highly heated part of the reservoir-cooler of the Balakovo NPP, and poorly heated part, in the adjacent water area of the Saratov reservoir. Differences were revealed: species richness and diversity; numbers and biomass; saprobity indices of the areas of these reservoirs; a positive or negative trend of long-term dynamics of the studied indicators macrozoobenthos. Over the study period the composition of benthic invertebrates of the reservoir-cooler of Balakovo NPP showed 42 species of aquatic organisms: Oligochaeta – 4, Mysidacea – 3, Corophiidae – 1, Gammaridea – 9, Odonata – 1, Chironomidae – 19, Ceratopogonidae – 1, Trichoptera – 1, Bivalvia – 2, Gastropoda – 1. The species richness, abundance and biomass of macrozoobenthos of the highly heated thermal water part of the cooling reservoir of the Balakovo NPP is significantly lower compared to the cold-water one. The water reservoir-cooler of Balakovo NPP can be described as α-mesosaprobic (moderately polluted, the 3rd quality class). Adjacent to the reservoir-cooler an area of the Saratov reservoir can be described as α-mesosaprobic (contaminated, 4th class of quality). There was no statistically significant increase or decrease (from 2011 to 2018) in the number, or biomass of macrozoobenthos and saprobity of the studied reservoirs. A statistically significant increase in the number of macrozoobenthic species in the cooling reservoir of the Balakovo NPP was found. Due to the fact that by 2018, some restoration of submerged vegetation (previously depleted Ctenopharyngodon idella) and, accordingly, the phytophilic group of benthos began to be observed.

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