Abstract
The trophic structure and quantitative characteristics of zooplankton in four shallow water areas of Meshinsky Bay of Kuibyshev Reservoir were studied in the summer and autumn seasons. The sites differed in their protection from wind and wave impacts, and in intensity of macrophyte overgrowth. The maximum species richness of zooplankters feeding in the water column was observed in open and vegetation-free shallow water and foraging from the surface of the substrate in closed areas, overgrown mainly with one type of submerged plant. The highest quantitative indicators of zooplankton in all areas were observed in summer. Regardless of the season, the maximum abundance and biomass of communities was observed in protected shallow water in thickets of Potamogeton lucens L. This is associated with the density of vegetation cover protecting invertebrates from predation by fish.
Highlights
The coastal zone is an important biotope, which contributes significantly to basin hydrochemistry and biology
The purpose of this paper is to describe the trophic structure and quantitative characteristics of zooplankton in different stages of the growing season in the different types of littoral zone of Meshinsky Bay of the Volga-Kama Reach of the Kuibyshev Reservoir
The species composition of zooplankton in Meshin sky Bay, Kuibyshev Reservoir during the study period was represented by 66 species (Rotifera – 36, Cladocera – 20, Copepoda – 10), of which three are immigrants of the Ponto-Caspian assemblage (Heterocope caspia Sars, 1897, Cornigerius maeoticus (Pengo, 1879), Eurytemora caspia Sukhikh et Alekseev, 2013) and 1 – Boreal-Arctic (E. lacustris (Poppe, 1887))
Summary
The coastal (littoral) zone is an important biotope, which contributes significantly to basin hydrochemistry and biology. It shows pronounced variability of the qualitative and quantitative characteristics of communities of aquatic organisms, since it is the most affected by water level changes, interactions of air mas ses, land, water, and basin floor. It is influenced by coupled wave and wind mixing, and its macrophyte thickets. As shallow zones occupy vast areas in some large reservoirs, play a significant role in their biological regime, and are the first to respond to changing environmental factors, their study remains relevant
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