Biodiversity of the Ingoda River ecosystem

The results of a study of the biodiversity of hydrobionts in the Ingoda River are presented. In phytoplankton sixty six taxa of algae with a rank below the genus have been identified. The zooplankton contains 21 species. The species composition of the macrophytobenthos includes 5 taxa. In the flora of hydrophytes, 15 plant species have been identified. The zoobenthos contains 40 species. Our researches have been showed that widespread species prevail in the flora and fauna of hydrobionts in the Ingoda River. Two alien species (Elodea canadensis and Gmelinoides fasciatus) have been recorded in the Kenon Lake. A very rare East Siberian species of mayfly Acanthametropus nikolskyi has been recorded in the Ingoda River zoobenthos.

THE FINDING OF THE INVASIVE AMPHIPOD GMELINOIDES FASCIATUS (STEBBING, 1899) IN WATERCOURSES OF THE ONEGA LAKE BASIN

The invasive amphipod Gmelinoides fasciatus (Stebbing, 1899) was not previously recorded in the rivers of the Onega Lake basin, although it has spread widely in its littoral in recent years. In 2019 and 2020, this species was found to inhabit the estuarine zones of watercourses (the Rybreka River and the Drugaya River) at a considerable distance from the lacustrine littoral zone (0.5 and 1.7 km, respectively). It was revealed that G. fasciatus is included in the communities of both pools and riffles, and in some areas reaches dominant positions in the macrozoobenthos, which indicates the possibility of further expansion of its range due to the river ecosystems of the region.