Diatom assemblages in superficial sediments from the Gulf of Riga, eastern Baltic Sea

  • Maire Sakson
  • Urve Miller
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 90)


Twenty one superficial sediment samples from areas of high and moderate eutrophication in the Gulf of Riga were studied with respect to siliceous microfossils, mainly diatoms.

The results seem to imply that the number of taxa and the abundance of the frustules are affected by runoff from rivers and the degree of eutrophication in different parts of the Gulf. Areas with high eutrophication, e.g. the river estuaries, have diatom assemblages of varying composition, while in areas with moderate eutrophication the composition is almost constant and the influx of freshwater diatoms and littoral periphyton small. The high abundance and low diversity of brackish-marine and brackish, planktonic diatoms seem to be a result of an influx of nutrients and pollutants in the water and bottom sediments. The sea ice diatoms occurring in the Baltic waters and also in the Gulf of Riga tend to be resistant to eutrophication or are even favoured by it.

Key words

diatoms eutrophication sediments Gulf of Riga Baltic Sea 


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Copyright information

© Springer Science+Business Media Dordrecht 1993

Authors and Affiliations

  • Maire Sakson
    • 1
  • Urve Miller
    • 2
  1. 1.Institute of GeologyEstonian Academy of SciencesTallinnEstonia
  2. 2.Department of Quaternary ResearchStockholm UniversityStockholmSweden

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