GEOCHEMICAL PECULIARITIES OF BIOTA FUNCTIONING IN WATER BODIES OF KARELIA

Multiple reported data on plankton, benthos, and chemical composition of surface waters and geology ofKareliaare summarized in order to reveal regional peculiarities of the formation of aquatic communities’ structure and biological productivity. A basic scheme for the biological productivity formation of water bodies inKareliais proposed. The main features of the humid climate ofKareliaare the low average annual air temperature and excessive humidification. The geographical features determine the specific physico-chemical properties of the aquatic environment, including low temperature, short vegetation period, low total dissolved solids (TDS), pH and phosphorus concentrations. Low water temperature and phosphorus concentration limit the development of highly productive forms of biota. Increased color of water diminishes the area of phytoplankton distribution. Low TDS concentration of water restricts the growth of diatom frustule and shell-bearing mollusks, which can limit the total biomass of plankton and benthos. Acid reaction of the environment can have toxic effects on aquatic animals. The proposed scheme was tested on seven lakes ofKarelia, located in different landscapes and differed in the degree of swampiness and density of the river network in the catchment area, in flowage, TDS concentration, color, pH, phosphorus concentration. The performed principle component analysis has statistically confirmed the regularities identified due to the generalization of reported information.

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