Journal of Siberian Federal University. Biology: Assessment of the Trophic State of a Small Plain Reservoir during Different Periods of Its Existence (a Case Study of the Penza Reservoir on the Sura River)

Journal of Siberian Federal University. Biology / Assessment of the Trophic State of a Small Plain Reservoir during Different Periods of Its Existence (a Case Study of the Penza Reservoir on the Sura River)

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Issue: Journal of Siberian Federal University. Biology. 2020 13 (4)
Authors: Shashulovskaya, Elena A.; Mosiyash, Svetlana A.; Dalechina, Inna N.; Filimonova, Irina G.; Grishina, Liliya V.; Kuzina, Elena G.; Shashulovskaya, Olga V.
Contact information: Shashulovskaya, Elena A.: Saratov Branch of Russian Federal Research Institute of Fisheries and Oceanography Saratov, Russian Federation; ; ORCID: 0000-0003-1072-7046; Mosiyash, Svetlana A.: Saratov Branch of Russian Federal Research Institute of Fisheries and Oceanography Saratov, Russian Federation; ORCID: 0000-0003-0875-6358; Dalechina, Inna N.: Saratov Branch of Russian Federal Research Institute of Fisheries and Oceanography Saratov, Russian Federation; Filimonova, Irina G.: Saratov Branch of Russian Federal Research Institute of Fisheries and Oceanography Saratov, Russian Federation; Grishina, Liliya V.: Saratov Branch of Russian Federal Research Institute of Fisheries and Oceanography Saratov, Russian Federation; Kuzina, Elena G.: Saratov Branch of Russian Federal Research Institute of Fisheries and Oceanography Saratov, Russian Federation; Shashulovskaya, Olga V.: Saratov Branch of Russian Federal Research Institute of Fisheries and Oceanography Saratov, Russian Federation
Keywords: Sura (Penza) reservoir; organic matter; mineral forms of nitrogen and phosphorus; total iron; phytoplankton; plasticity
Abstract: The present study provides comparative characterization of the contents of nutrients and organic matter and quantitative parameters of phytoplankton of the Sura (Penza) reservoir during 1984–1992 and 2016–2019. At present, the content of phosphates has increased by 3 times while the concentration of mineral nitrogen has remained unchanged. The seasonal dynamics of phosphorus and mineral nitrogen are different: the maximum phosphate concentrations are observed in summer and autumn, but nitrogen is the highest during the flood period. At the present time, phosphorus is mainly generated in intra-reservoir processes. Nitrates were the predominant form of mineral nitrogen in 2016–2019, and their spring maximum suggests predominant intake with the flood flow. The ratio of the mineral forms of nitrogen and phosphorus indicates that, at the present time, phosphorus is not the element that limits the development of algae. In certain periods (summer 2017–2018), a significant negative relationship was observed between the algal biomass and the total iron content in water (r = -0.81, p = 0.016). No Cyanoprocaryota “blooms” have been observed in recent years. In 2019, the abundance of Cyanoprocaryota increased, but in some regions, biomass was no more than 2.18–2.42 mg/dm3. In 2019, the dominant Cyanoprocaryota group did not contain Microcystis aeruginosa (Kütz.), but a new species was identified – Planktothrix agardhii (Gom.) Anagn. et Kom., which is resistant to low light and the low nitrogen to phosphorus ratio. The proportion of readily oxidized organic matter in the total organic matter, both at the end of the 20th century and recently, characterizes the reservoir as stably eutrophic, although the quantitative characteristics of phytoplankton in recent years indicate declining trophic status
Pages: 368–386
DOI: 10.17516/1997-1389-0334
Paper at repository of SibFU: https://elib.sfu-kras.ru/handle/2311/137897

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