Assessment of zoobenthos communities transformation in Skurcha Lake after eco-rehabilitation measures

Document Type : Research Paper

Authors

1 Kazan Federal University, Kazan, Kremlevskaya, 18, 420008, Hibinskaya, 24-122, Russia

2 Kazan Federal University, Kazan, Chistopolskaya, 7-54, Russia

3 State Committee Republic of Abkhazia on Ecology, Republic of Abkhazia, Sukhum, 71/11 Sakharov Str.; Institute of Ecology of the Academy of Sciences of Abkhazia, Republic of Abkhazia, Sukhum, Krasnomayatskaya Str. 67

4 Kazan Federal University, Kazan, Daurskaya, 48v-78, Russia

5 Kazan Federal University Russia, Kazan, Chistopolskaya, 7-54, Russia

10.22124/cjes.2023.7228

Abstract

In this study, the results of changes in the zoobenthos community of Lake Skurcha, the Republic of Abkhazia after hydrotechnical measures for eco-rehabilitation of the reservoir are described. The Lake-Lagoon Skurcha was in adverse ecological condition (there was a shortage of oxygen, fish starvation, low species diversity). During the events, constructing channel from Kodor River, subordinate reservoirs, wetlands, tributaries have been created here to improve the water quality in the lake. The study was carried out on the species composition, abundance and biomass of organisms, indices of species diversity and similarity of zoobenthos in the period from 2009 to 2016. During this period, 56 species of zoobenthos organisms were found (Insects 32, Crustaceans 10, Hirudinea 2, Polychaetes 1, Gastropoda 9 and Bivalvia 2 species). The highest wealth was observed during the inflow period in the first years of the experiment (2011-2012), in conditions of desalination and brackish water. There is no similarity in the species composition of zoobenthos, which indicates a strong transformation of the community. During the influx period, biomass and abundance indicators increased due to insect organisms, then the proportion of brackish-water species upraised. Currently, freshwater and brackish-water species coexist in the lake, with brackish-water species dominating in the composition of zoobenthos. Improvement of water quality and diversity of zoobenthos were revealed after eco-rehabilitation measures.

Keywords

References

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Articles in Press, Corrected Proof
Available Online from 31 October 2023

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