Holocene lacustrine microfossils and environmental changes

This review is concerned with the biostratigraphical use of the lacustrine microfossils such as diatoms, blue-green and green algae, Mallomonadaceae, Cladocera and larval insect remains preserved in lake sediments and their value as bioindicators of Holocene environmental changes in Finland. From lake sediment studies discussed in the text it can be concluded that the lacustrine microfossils are useful for the reconstruction of typological and waterlevel changes in lakes, catchment conditions and climatic fluctuations. They can also give profitable information for examing the cultural eutrophication and acidification of lakes. In the light of the microfossil studies the most significant natural development of Finnish lakes has been a typological succession from the mineroeutrophic (argillotrophic or pelotrophic) state towards more dysoligotrophic conditions. This meiotrophication process is strictly related to the influence of environmental humic substances on the limnology of lakes. To analyze microfossils is still the most important key for the characterization of lacustrine environments during the Holocene.

Abstract licence: CC BY-NC

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