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. The  wastewaters ,of  an ,iron  mining ,company ,in  NW ,Russia  have  changed ,the  water  quality in some forest lakes to be hard with a high pH, in contrast to the soft water and low pH in natural lakes. Two impacted lakes and a reference lake were sampled,once inearly August in three successive years for water quality, plankton communities, and fish. The concentrations of potassium, lithium, and sulphate were high in the impacted lakes. Total phosphorus was low (~ 10 µg L,) in all lakes. The primary producers’ biomass,and chlorophyll a content in the impacted,lakes were high because,of high,densities of autotrophic,picocyanobacteria (Synechococcus,spp.). All planktonic communities,showed ,a  changed ,taxa  composition ,and  lower  species  richness.  Zooplankton  was  predominantly Rotatoria in all the lakes. In the impacted lakes, Cladocera was represented by Bosmina, and Copepoda,by small,cyclopoids. The most obvious substance,to be harmful to some,planktonic species was potassium. The high pH and high mineral content of the water obviously lower both the toxicity and the bioavailability of heavy metals in the impacted lakes.  Key words: alkaline mining waste, picocyanobacteria, Synechococcus, phytoplankton,Ciliata, zoo- plankton.

The pelagic food web in forest lakes affected by alkaline mining waste in NW Russia