| Summary: | Lake Urozero is a state regional hydrological natural monument of the Republic of Karelia. This water body is characterized by high transparency and high water quality. During the recent decades, climatic changes and fluctuations in temperature and precipitation have been observed in the investigated area, all of which may affect the state of aquatic ecosystems. The modern state of zooplankton in the pelagic zone of Lake Urozero has been assessed based on the observations, carried out in May, July and September, 2018. Catches were extracted using the net method at a deepwater station in the center of the lake. In the pelagic zone of the lake, 25 species and groups were identified up to the genus and lower (8 species of copepods, 8 species of cladocerans, and nine species of rotifers). The species composition and dominant complex of the zooplankton community was stable and has not changed since the 1950s. Seasonal changes in the community correspond to the regularities typical for the lakes of Karelia. The vertical distribution of zooplankton has some specific features, stemming from high transparency of the water. During the growing season, most organisms are concentrated below 10 m due to the distribution of food resources and/or the influence of planktonophagous fish species. Summer values of the abundance (27,350 ind./m3) and biomass (0.906 g/m3), as well as functional (production of 57 kcal/m2 per season) zooplankton indicators of Lake Urozero correspond to the oligotrophic status of the plankton system. Озеро Урозеро имеет статус государственного регионального гидрологического памятника природы Республики Карелия. Водоем характеризуется высокой прозрачностью и качеством воды. В последние десятилетия на территории республики отмечено изменение климата, колебания температурного режима и количества осадков, что может повлиять на состояние водных экосистем. В работе дана оценка современного состояния зоопланктона пелагиали оз. Урозеро. Уловы производились сетным методом в мае, июле и сентябре 2018 г. на ...
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