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The postglacial land uplift of Fennoscandia and the resulting environmental changes are important factors for changes in coastline ecosystems. In this context, shoreline displacements caused by isostatic land uplift and eustatic sea level fluctuations during the last 10 000 years were adequately described for the Baltic (Klemann & Wolf 2005, Passe & Andersson 2005). According to Pan & Sjoberg (1999) the Fennoscandian shield shows uplift rates from 1 to 11 mm·y. While the land uplift-based Holocene coastline development and the resulting environmental changes in the Baltic region are well investigated (e.g. Berglund et al. 2005), the eastern part of the Fennoscandian shield bordering the White Sea remains less studied, in particular its development during the last centuries. Diatoms occur in both marine and freshwater sediments and have proven to be a helpful tool for environmental reconstructions. Since they are very sensitive to changes in salinity (Ryves et al. 2004), trophic conditions (Bennion et al. 2004) and pH (Birks et al. 1990) diatoms are used for defining shoreline displacement and sea level fluctuations in costal areas (Kjemperud 1980). Dated marine to freshwater transitions, preserved in sediment cores from costal basins, have been frequently used for reconstructing relative sea level changes and isostatic uplift (Pienitz et al. 1991). In the present study, analysis of sedimentary diatoms was used to investigate the development of two shallow freshwater lakes close to the Karelian White Sea coastline during the past centuries. The following questions have been asked: 1) Are salinity changes in the study lakes detectable by means of diatoms? 2) Are the investigated lakes and their sediments sensitive paleo-systems for studying land uplift processes at the White Sea coastline?

Shoreline displacement and salinity changes: The development of two shallow freshwater lakes at the Karelian White Sea coast (Northwest Russia) as reflected in sedimentary diatoms