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The analysis of lake sediment cores have been long used as historical integrators ofenvironmental changes. Nutrient poor isoetid lakes remain under studied in the northboreal region. Hence, the bottom sediments of two north boreal Lobelialakes, located in NE Finland were analysed for the presence of Cladocera andPediastrum remains. Sediment cores from the littoral zones weresampled, sectioned every centimetre and aged with 210Pb. The number of taxa ofboth Cladocera and Pediastrum identified in the cores was high, while thenumber of individuals in each taxon was low. In Lake Kevojärvi, twenty five Cladoceraspecies and eight Pediastrum species were found. Along with widelydistributed species, typical for north boreal regions, species preferring more temperateenvironments occurred. In Lake Petäjälampi, the species composition was similar. Twentyone Cladocera species and five Pediastrum species occurred there, howeverwith a lower frequency of individuals in each taxon. In both Lobelialakes, analyses of subfossil Cladocera and Pediastrum remains,from the sediments deposited within the last 30–40 years indicated a recent increase introphic status

Subfossil faunal and floral remains (Cladocera,Pediastrum) in two northernLobelialakes in Finland