Macrophytes As Indicators Of The Ecological Status Of Valaam Island Small Lakes System

The article evaluates the ecological status of five small lakes on Valaam Island (Igumenskoe, Chernoe, Ossievo, Nikonovskoe, Krestovoe) using macrophytes as bioindicators. methods proposed by Finland, Sweden, and Norway were used, to assess state eutrophication, change in composition specific species, water level, acidification, according different indexes (Reference index (RI), Trophic Macrophyte Index (TMI), (TIc), Proportion Type– Specific Taxa (PTST), Percent Model Affinity (PMA), Water level (WIc), Acidification (SIc)). An analysis floristic for period 2011 – 2020 was realized, including taxonomic analysis, ecogroup, macrophyte diversity. dominant taxon Elodea canadensis Michx. Igumenskoe, Ossievo Calla palustris L. Nikonovskoe Krestovoe lakes. ecogroup hygrohelophyte most diverse all studied. each assessed parameter reflects that are characterized a mesotrophic eutrophic state, there is variation species no or acidification processes presumed occur any In general, method has its limitations, but it suggested continue studies RI, TMI, PTST, PMA indices, integrate them with other national physicochemical biological indices.