12th International Conference on Harmful Algae

INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006potential to outcompete less UVBRtoleranttaxa at increased levels ofUVBR.PO.13-35Spatial and temporal analysis ofPSP toxins in plankton andmussels along the Swedish WestCoastSession: PO.13 - Regional eventsSusanne Lindegarth 1 , B Lundve 2 , ESelander 31 Göteborg University, Tjärnö Marine Lab.,STRÖMSTAD, Sweden2 Kristineberg Marine Research Station,FISKEBÄCKSKIL, Sweden3 Tjärnö/Göteborg University,STRÖMSTAD, SwedenBlooms of Alexandrium tamarense,A. minutum and A. ostenfeldii,known to produce PSP- toxins,occassionally occur in Swedishwaters. During the last 10-15 years,sporadic testing of PST by themouse bioassay in farmed bluemussels (Mytilus edulis) has shownthat the regulation limit for thesetoxins is rarely exceeded. However,due to the prohibition to performmouse bioassay in Sweden, veryfew data on the spatial andtemporal distribution of PST inmussels exist. Further, there are nostudies confirming the identity of thespecies responsible for PSTproduction in Sweden. During thelast years, HPLC analysis of PSThas been established as a researchtool in Sweden. This paper reportsthe initial results from a 2-yearmonitoring study, where planktonand mussels were sampled alongthe Swedish west coast using aspatial and temporal hierarchialsampling design. The resultsshowed that PST levels above thelimit for marketing were detected inmore than half of the samples fromMay and June 2005. These findingsindicate that PST is more commonthan previously believed and mayconstitute a serious threat toconsumers of uncontrolled mussels.PO.13-19Blooms of Alexandriumostenfeldii in a shallowarchipelago area in Åland, SWFinlandSession: PO.13 - Regional eventsTJ Lindholm 1 , J Franzén 2 , A Kremp 31 Abo Akademi University, ABO (TURKU),Finland2 Farmer, FÖGLÖ, Åland, Finland3 Finnish Environment Institute, HELSINKI,FinlandSummer blooms of the marinedinoflagellate Alexandriumostenfeldii were observed in ashallow, densely vegetatedarchipelago channel in Föglö, Åland(SW Finland) in 2003-2005. Inbrown water with densities of about1000 cells/ml, chlorophyll a valuesexceeded 10 microgram/l. Theblooms were associated with strongbioluminescense, a phenomenonnot previously reported from Åland.Thus, it is possible that A.ostenfeldii has reached Ålandrecently. The blooms were patchyand transported back and forth inthe area. Phototactic behaviour andfast swimming of A. ostenfeldii inresponse to local water currents(partly caused by scheduled shiptraffic in a nearby fairway) may havecontributed to the bloom formation.No harmful effects were observed inthe field, but toxicity is suspected incultured material.PO.12-12Toward integrating moleculardata into the process ofrecognizing new dinoflagellatespeciesSession: PO.12 - Taxonomy and phylogeny222