Journal of Siberian Federal University. Biology / Reconstruction of Catastrophic Changes in the Aquatic Ecosystem Based on Crustacean Analysis of Bottom Sediments of Varcha Bay (Krasnoyarsk Reservoir)

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Issue
Journal of Siberian Federal University. Biology. 2026 19 (2)
Authors
Frolova, Larisa A.; Shneidman, Yan T.; Kadirov, Azat G.; Rogozin, Denis Yu.
Contact information
Frolova, Larisa A.: Institute of Archaeology and Ethnography SB RAS (Novosibirsk, Russian Federation); ; ORCID: 0000-0001-8505-0151; Shneidman, Yan T. : Moscow Institute of Physics and Technology (Dolgoprudny, Russian Federation); ORCID: 0009-0009-6672-446X; Kadirov, Azat G.: Kazan (Volga Region) Federal University (Kazan, Russian Federation); ORCID: 0000-0001-6279-5994; Rogozin, Denis Yu. : Institute of Biophysics SB RAS Federal Research Center “Krasnoyarsk Science Center SB RAS” (Krasnoyarsk, Russian Federation); Siberian Federal University (Krasnoyarsk, Russian Federation); ORCID: 0000-0002-9350-2936
Keywords
Cladocera; Cladocera; Krasnoyarsk Reservoir; bottom sediments; freshwater ecosystems; salt lake; Artemia; Khakassia
Abstract

The construction of hydroelectric power plants and the creation of reservoirs lead to the flooding of vast territories, including water bodies of different types – from freshwater to saline ones. However, the response of aquatic ecosystems to such an abrupt change in hydrological regime remains insufficiently studied. The aim of this study is to reconstruct catastrophic changes in the composition of zooplankton communities during the flooding of Lake Varcha (Khakassia). For this purpose, analysis of crustacean (Cladocera) remains from bottom sediments of Varcha Bay was performed. The bay formed on the site of a previously existing lake after the filling of the Krasnoyarsk Reservoir. The results showed that before flooding, the site was occupied by a small, well-warmed, saline lake inhabited by the extremophile brine shrimp Artemia sp. (Anostraca). After the formation of the Krasnoyarsk Reservoir, complete reorganization of zooplankton communities occurred: a monodominant community dominated by Artemia sp. was replaced by a freshwater community dominated by planktonic taxa of the genera Bosmina and Daphnia longispina gr. The freshwater planktonic community had been fully established by 1969–1970. The highest quantitative indicators and biodiversity indices were recorded in 1969–1970 and after 2007. The cladoceran paleocommunity that formed after flooding reflects the presence of a deep freshwater body with large areas of open water, where littoral taxa are scarcely represented. Based on cladoceran analysis, the taxonomic composition of zooplankton in the Krasnoyarsk Reservoir has been supplemented with a new species, Leydigia acanthocercoides (Fischer, 1854)

Pages
288–311
EDN
MAEKFW
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/159247

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