THE BIOMONITORING OF WATER ECOSYSTEMS IN UKRAINIAN POLISSYA ON THE BASIS OF EVALUATION OF THE STABILITY OF MACROPHYTE DEVELOPMENT

The most striking changes in the species composition are manifested at the points of the most significant anthropogenic pressure in the presence of toxic compounds in aquatic ecosystems. Significant variations in view indexes were noted when the high concentration of heavy metals was reached in the bottom soil. The most significant influence on the species composition is due to high concentrations of the active forms of zinc and cuprum cations in both coastal soils and bottom sediments, although the excessive maximum limits allowed were only in the second group of substances. The close correlation between the content of all investigated groups of heavy metals in bottom sediments and species numbers, the index of dominance, Shannon Diversity Index, and Pielou’s Evenness Index were established. For Margalef Species Richness Index, close dependencies were established for active forms of cations of nickel, cobalt, zinc and cadmium, for other groups the bonds were weak. For Sørensen-Dice Index weaknesses were found with the contents of active forms of cations of nickel and chromium; for other groups of active forms of heavy metals, except cobalt cations, close ties were established as well