Interannual Dynamics of Changes in Macrozoobenthos Communities in the Littoral Zone of Lake Ladoga

The findings of 2019 research on bottom biocenoses in several macrophyte beds around Lake Ladoga are presented. The spatial distribution of macrozoobenthos quantitative properties indicate significant variances. Zoobenthos biomass and density ranges from 0.17 to 77.13 g/m2 and 392–49 800 specimen/m2, respectively. In terms of biomass, amphipods dominate the taxa (on average, 49%). Compared with 2014, by 2019 there was a decline in the zoobenthos level of development. The Gmelinoides fasciatus, Micruropus possolskii, Pontogammarus robustoides, and Chelicorophium curvispinum invasive amphipod species are demonstrated to significantly influence the interannual alterations of macrozoobenthos communities in the lake’s littoral zone.