Hydrochemical conditions of phytoplankton development in Zaporizhian (Dnipro) reservoir.

Current issue: Volume 21, No. 1 (2021)

HYDROCHEMICAL CONDITIONS OF PHYTOPLANKTON DEVELOPMENT IN ZAPORIZHIAN (DNIPRO)
RESERVOIR

Yuliia Nikolenko

Nikolenko Y. 2021. Hydrochemical conditions of phytoplankton development in Zaporizhian (Dnipro) reservoir. Acta Biol. Univ. Daugavp., 21 (1): 59 – 69.

Abstract
Phytoplankton development directly depends on environmental conditions. Clarification of the relationship between environmental changes and phytoplankton communities is necessary for understanding and predicting the impact of human activity on freshwater ecosystems, particularly reservoirs. Zaporizhian (Dnipro) reservoir is the first of the artificial reservoirs in the cascade on the Dnipro, which at the present stage of existence is subject to increased anthropogenic load. This load primarily affects the indicators of phytoplankton as a primary component of hydroecosystems. The study on hydrochemical indicators of the Zaporizhian reservoir in the summer of 2019 has shown that the content of ammonia, sulfates, indicators of permanganate oxidizability, and in certain areas the content of dissolved oxygen exceeded the regulatory limits. Phytoplankton, depending on the selection points, was represented by bluegreen algae, which formed 76–98% of abundance and 30–70% of the biomass. According to the Pearson correlation coefficients, it has been found that the main hydrochemical indicators affecting the development of quantitative indicators of phytoplankton in the Zaporizhian reservoir are water temperature, indicators of permanganate oxidizability and phosphate content.

Key words: phytoplankton, Zaporizhian (Dnipro) reservoir, hydroecosystems, hydrochemical conditions.

Yuliia Nikolenko. Oles Honchar Dnipro National University, Department of General Biology and Aquatic Bioresources, Gagarin ave., 72, Dnipro, Ukraine, 49010, E-mail: jul.nikolenko@gmail.com