Assessment of hydrobiocenosis state over sections of the Kola North water bodies heavily polluted with copper and nickel compounds

The results of assessments of the water community state with allowance for a chronic character of pollution with heavy metal compounds are presented based on the analysis of the long-term hydrochemical and hydrobiological information of the State Service of Observations over water bodies of the Kola North. Characteristic signs of changes in quantitative and qualitative indicators of phyto-and zooplankton development relative to the concentration level of nickel and copper compounds and other pollutants are noted.