Bioaccumulation of PSTs produced by Alexandrium ostenfeldii in the northern Baltic Sea |
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Authors: | Outi Setälä Sari Lehtinen Anke Kremp Päivi Hakanen Harri Kankaanpää Katrin Erler Sanna Suikkanen |
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Affiliation: | 1. Finnish Environment Institute, Marine Research Centre, 00251, Helsinki, Finland 2. Tv?rminne Zoological Station, Helsinki University, 10900, Hanko, Finland 3. Department of Food Chemistry, University of Jena, Jena, Germany
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Abstract: | Bioaccumulation of paralytic shellfish toxins (PSTs) produced by the dinoflagellate Alexandrium ostenfeldii was investigated in the northern Baltic Sea. The study was based on the assumption that the toxins released during high magnitude blooms of A. ostenfeldii will accumulate in the biota at the bloom site, especially in bivalves. To test this, experiments with blue mussels (Mytilus trossulus) exposed to toxic A. ostenfeldii in field conditions were carried out together with a field survey aimed to quantify natural distribution of PSTs in the biota. As hypothesized, PSTs accumulated in the tissues of the blue mussels during the incubations. Toxins were also detected in natural bivalve communities at the bloom site, the highest toxin concentrations found in the small Cerastoderma glaucum individuals, exceeding the EC safety limit for shellfish consumption. Relatively high total toxin concentrations were also detected from fish (Perca fluviatilis). These are the first records of PST transfer in the food web of the northern Baltic Sea. |
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