Characteristic features of the taxonomic and eco-geographic structure of phytoplankton and periphyton – most important components of aquatic ecosystems of different types in Karelia, were described relying on the results of long-term research. Most common species and indicator-species that can be used in assessing the levels of mineralization, acidification, organic pollution and eutrophication were identified.
Keywords: phytoplankton, periphyton, taxonomic composition, indicator species, lakes, rivers, Republic of Karelia
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