Abstract
The regulation of river flow entails a change in the habitat of aquatic organisms. Biological communities can vary and be formed over several years, that is why it is necessary to monitor the state of reservoir ecosystems regularly. Currently, there is a significant gap in modern studies of the benthic fauna of the Boguchany reservoir, which is the lower stage of the Angarsk hydro-electric power station cascade. During five years (2014–2015, 2017–2019), zoobenthos communities had been studied in the lower part of the Boguchany reservoir. The benthic fauna was chironomid-gammarid in nature with a predominance of chironomids. 75 species of invertebrates were identified, 39 of them belong to dipterous insects of the Chironomidae family. The shallow water communities are qualitatively and quantitatively much richer than in the deep water zone. With a decrease in depth, there was an increase in the number of invertebrates by about 6 times due to the small-sized species of chironomids. The number of zoobenthos in the deep water zone was 0.3 thousand ind./m2, in the shallow water — 1.8 thousand ind./m2. The biomass in different deep zones did not differ significantly: in the deep part — 2.0 g/m2, in shallow water — 2.4 g/m2. The trophic status of the Boguchany reservoir in 2018 corresponded to the mesotrophic type of medium food capacity (III class), in other years — to the oligotrophic type of low food capacity (II class). Nowadays, the formation of bottom fauna is at the stage of biocenosis stabilization. An integrated approach of three bioindicative indicators (Mayer, saprobity and Shannon indices) was used to assess water quality according to bottom communities. The fundamental criterion for the selection of indices was the consideration of the benthocenosis structural organization, i.e. the development degree of indicator taxa.Water quality, assessed by the state of zoobenthos communities, corresponded to III class, “Moderately polluted”, β-mesosaprobic zone
Publisher
PANORAMA Publishing House
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