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3F - Coastal Zone Mgnt (WEP/187) Ecotoxicological investigations in three areas of the German Baltic coast. Neddermann, Kirsten1, Heise, Susanne1, Carolin, Peters1, Wolfgang, Ahlf1, 1 Technical University of Hamburg-Harburg, Hamburg, Germany, Germany ABSTRACT- To estimate the potential toxicity of water and sediments, the use of bioassays is required. The bioavailability of harmful substances is determined to a great extend by the concentration of ions and thus the salinity of the medium. There are a lot of experiences for the quality assessment of freshwater and marine sediments with freshwater and marine bioassays. However, there is a lack of knowledge about the applicability and validity of those tests-sets on brackish sediments like in estuaries and the Baltic Sea. The goal of this project is to validate the application of a freshwater and a marine bioassay test set on brackish sediments. For that reason ecotoxicological investigations in three coastal areas of the Baltic Sea were carried out. On the basis of a natural salinity- and pollutant gradient from the Oder lagoon (Pomeranian Bight, southern Baltic Sea) to the Arkona Basin (Arkona Sea, Baltic Sea) the application of the bioassay test-set were examined. Furthermore, a 30 year old dumping site of industrial waste in the Luebeck Bight, the probably highest polluted area in the western Baltic Sea, was ecotoxicology investigated aiming at a risk assessment. First results will be presented. Key words: bioassay, estuary, sediment toxicity |
