It is shown that increasing fish biomass due to planktivorous whitefish Coregonus lavaretus L. in Lake Sevan leads to a reduction in the number of species, abundance, and biomass of spring ZP. In addition, quantitative characteristics of large species of Cladocera, Daphnia (Ctenodaphnia) magna Straus, and a decrease in the Shannon index value are changing as well. A decrease in the number of filter-feeding cladocerans contributes to a decrease in water transparency and an increase in the proportion of Rotifera in the total abundance and biomass of the community.
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Balushkina, E.B. and Vinberg, G.G., The relationship between body weight and length in planktonic animals, in Obshchie osnovy izucheniya vodnykh ekosistem (General Basics of the Study of Aquatic Ecosystems), Leningrad: Nauka, 1979, p. 169.
Bening, A.L., Kladotsera Kavkaza (Cladocera of the Caucasus), Tbilisi: Gruzmedgiz, 1941.
Krylov, A.V., Kosolapov, D.B., Kosolapova, N.G., et al., The plankton community of Sevan Lake (Armenia) after invasion of Daphnia (Ctenodaphnia) magna Straus, 1820, Biol. Bull. (Moscow), 2018, vol. 45, no. 5, p. 505.
Krylov, A.V., Airapetyan, A.O., Kosolapov, D.B., et al., Features of changes in the plankton structure in the pelagic zone of a mountain lake with an increase in fish density in summer and autumn, Biol. Bull. (Moscow), 2020, vol. 47 (in press).
Meshkova, T.M., Zooplankton ozer, prudov i vodokhranilishch Armenii (Zooplankton of Lakes, Ponds, and Reservoirs of Armenia), Yerevan: Akad. Nauk Arm. SSR, 1968.
Metodika izucheniya biogeotsenozov vnutrennikh vodoemov (Methods for Studying Biogeocenoses of Inland Water Bodies), Moscow: Nauka, 1975.
Ozero Sevan. Ekologicheskoe sostoyanie v period izmeneniya urovnya vody. 2016 (Environmental State during the Period of Water Level Changes), Yaroslavl: Filigran’, 2016.
This study was performed as part of State Task no. АААА-А18-118012690106-7.
Conflict of interests. The authors declare that they have no conflicts of interest.
Statement on the welfare of animals. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
Translated by D. Pavlov
Abbreviations: ZP—zooplankton; PhP—phytoplankton.
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Krylov, A.V., Hayrapetyan, A.O., Ovsepyan, A.A. et al. Interannual Changes in the Spring Zooplankton of the Pelagic Zone of Lake Sevan (Armenia) in the Course of Increasing Fish Biomass. Inland Water Biol 14, 113–116 (2021). https://doi.org/10.1134/S1995082921010053
- high-altitude lake
- fish biomass
- Daphnia (Ctenodaphnia) magna Straus