UDC

574.583(470.11+282.2)

Authors

Aleksandr P. Novoselov*, Igor’ I. Studenov*, Aleksey K. Koz’min*, Gennadiy A. Dvoryankin*, Ekaterina N. Imant, Aleksandr L. Levitskiy*
*Northern branch of the Knipovich Polar Research Institute of Marine Fisheries and Oceanography (Arkhangelsk, Russian Federation)
Corresponding author: Aleksandr Novoselov, address: ul. Uritskogo, 17, Arkhangelsk, 163002, Russian Federation;
e-mail: novoselov@pinro.ru

Abstract

The largest in the Arkhangelsk region Lacha Lake is the subject to succession changes of abiotic and biotic components of the aquatic ecosystem. The article describes food base characteristics of the lake. A rich species diversity (55 species) of planktonic invertebrates common to the northwestern zone and widespread in the northern part of the Palaearctic is described; their taxonomic status is determined. By the qualitative composition, the zooplankton community of the lake is characterized as a “Cladocera and Copepoda” type, represented in an equal number by cladocerans and copepods; rotifers have a lower value in the general spectrum. The interannual dynamics of qualitative and quantitative zooplankton indices and its spatial distribution over the water area of the reservoir have been revealed. In the period from the middle (1960‒1980s) up to the end of the 20th century, rotifers species appeared as a part of the lake zooplankton and gradually increased their number, being the indicator test objects. The quantitative indices of copepods decreased, and cladocerans, on the contrary, increased. In other words, because of the appearance and development of small forms of copepods and rotifers, zooplankton abundance increased without increasing its biomass in the ecosystem of the lake. At the beginning of the 21st century, the number of rotifers decreased insignificantly, while the number of large zooplankton (copepod) increased. The quantitative indices of cladocerans have not been changed significantly in the last 10 years. According to the fishery classification, the trophic status of the reservoir is determined: the Lacha lake can be considered as the mesotrophic medium-food pond for fish-plankton feeders by the zooplankton number and biomass. Macrovegetation is the most productive association. The above information can be useful in developing the rational commercial use of inland waters of the Northern Fishery Basin.

Keywords

zooplankton community of the Lacha Lake, species diversity of zooplankton, abundance of zooplankton, zooplankton biomass, spatial distribution of zooplankton, trophic status of the Lacha Lake

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