Abstract
The chemical features and the structure of biological communities in Lake Ladoga are considered. Comparative analysis was carried out for the species composition and biomass of phytoperiphyton, zooplankton, and zoobentbos in six Ladoga tributaries based on observational data of August 2013. The effect of natural and anthropogenic factors on the formation of the structure of river hydrobiocenoses is analyzed. The trophic status of rivers, their saprobiological state, and the significance of individual communities and biotic indices for bioindication of the ecological state of rivers are estimated.
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