Features of the structure and spatial distribution of plankton in the Sheksna Reservoir

Abstract

Based on the field studies conducted in August 2005 and 2007, the distributions of zooplankton structure and abundance, as well as chlorophyll content, in the Sheksna Reservoir are analyzed. A total of 107 zooplankton species have been found (46 Cladocera, 18 Copepoda, and 43 Rotifera), including 24 species (10 Cladocera, 2 Copepoda, and 12 Rotifera) new for the reservoir. In the surface layer of water, where blue green algae concentrate, zooplankton abundance and biomass are 1.5-5 times lower and the zooplankton structure is simpler than in deeper layers. The highest zooplankton biomass (>3 g/m 3 ) are observed in Lake Beloe and the upper area of the Sheksna section, while in the near shore sites it did not exceed 1 g/m 3 . There are no significant changes in zooplankton abundance when compared to the abundance recorded at the end of the past century.

Seasonal Dynamics of Zoplankton of the Sheksna Reservoir (Vologda Region)

“…При этом пик биомассы регистрируется во второй половине лета. Сходная сезон-ная динамика биомассы зоопланктона характерна для Рыбинского водохранилища [Лазарева, 2010[Лазарева, (Lazareva, 2010 Обилие зоопланктона варьирует в разные годы [Думнич, Крылов, 2002(Dumnich, Krylov, 2002; Лазарева и др., 2013 (Lazareva et al, 2013)]. Численность и биомасса зоопланктона в марте 2016-2020 гг.…”

Horizontal distribution of Cladocera in a subtropical lake marginal to a river

“…Others present sampling systems used along various littoral sites and in lake and reservoir limnetic zones (Bernot et al, 2004;Lazareva et al, 2013); however, studies on the simultaneous prevalence of Cladocera at both horizontal and vertical dimensions of lakes are relatively rare.…”