Evaluation and prediction of toxic cyanobacterial blooming in phytoplankton of the boguchany reservoir

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Abstract

Boguchany HPP is one of the largest Russian economic projects and a part of the Boguchany Energy and Metallurgical Association. Due to assessment of environmental damage, it is especially relevant to analyze the ecosystem of the regulated Angara River. The purpose of the present study is to obtain data on the composition and development of cyanobacteria in the Boguchany Reservoir at the design filling level in summer, as well as assess risks of toxic blooming in the reservoir. Classical methods for determining the trophic status of the reservoir and abundance of cyanobacteria were combined with detection of gene markers for cyanobacteria toxin synthesis - fragments of the mcyE and sxtA genes. In July 2016, three species of potentially toxic cyanobacteria, Aphanizomenon flos-aquae, Dolichospermum lemmermannii and D. flos-aquae, dominated the composition of phytoplankton. The phytoplankton population in the 0-15 m layer was 2.97 million cells/L and the biomass was 2.75 g/m3. The proportion of cyanobacteria in the total abundance of phytoplankton was 27 % (0.79 million cells/L); however, due to small cell size their contribution to the phytoplankton biomass was only 2 % (78 mg/m3). The maximum concentration of chlorophyll a was 12.6 µg/L which corresponded to that in a eutrophic reservoir. PCR-screening revealed cyanobacteria producing microcystins as well as saxitoxin and its analogues (paralytic shellfish toxins). The concentration of microcystins in water was 0.3 µg/L. Those results indicate that monitoring and strategies of control over toxic cyanobacteria blooming are necessary. It also will be important to assess the ecological state of the Boguchany Reservoir, with the focus on toxic cyanobacteria, in summer of 2020.

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Sorokovikova, E. G., Tikhonova, I. V., Podlesnaya, G. V., & Belykh, O. I. (2019). Evaluation and prediction of toxic cyanobacterial blooming in phytoplankton of the boguchany reservoir. Water and Ecology, 24(1), 86–93. https://doi.org/10.23968/2305-3488.2019.24.1.86-93

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