An assessment of the ecological state of the water area of the Volga-Kama reach of the Kuibyshev reservoir in the area of the Saralinsky section of the Volga-Kama Reserve were carried out. Thus, according to hydrobiological indicators, the water quality were estimate as “moderately polluted” – “polluted”, which corresponded to the third class.

научно-исследовательский институт озерного и речного хозяйства им. Л.С. Берга», г. Казань Представлены результаты исследований количественных данных зоопланктона мелководий Мешинского залива Волжско-Камского плеса Куйбышевского водохранилища по данным 2017 г. Фауна зоопланктона включала 66 видов, среди которых по видовому богатству доминировали коловратки. Общая численность и биомасса составили в среднем 10521,7 экз./м 3 и 351,7 мг/м 3 соответственно. Все три группы вносили в общую численность практически одинаковый вклад, однако биомасса формировалась за счет Cladocera и Copepoda. Ключевые слова: зоопланктон, численность, биомасса, Мешинский залив, Куйбышевское водохранилище.

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.