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 2006(=Lymnea) peregra as theintermediate host. In connectionwith the outbreak, thecyanobacterium Anabaenalemmermannii, and the flagellateGonyostomum semen dominatedthe algal community.In a survey of 25 recreation lakes inScania, Southern Sweden,schistosome cercariae were foundin four of these lakes. In all fourlakes, mass developments ofcyanobacteria alone or combinedwith Gonyostomum semen occurredregularly during the vegetativeseason.Increased endotoxin levels in lakewater may be associated withdevelopments of cyanobacteriaand/or Gonyostomum semen. Astudy of endotoxins inGonyostomum-dominated lakesrevealed high concentrations; 220-1880 EU ml -1 . Endotoxins in theblood stream of the bird-host maystimulate the production of thecytokine tumour necrosis factor(TNF). TNF may, in turn, stimulateegg-laying of the schistosomeparasite as well as the excretion ofthe parasite eggs from the host. Wesuggest that increased endotoxinconcentrations in the water aretriggering the occurrence ofschistosome cercariae in lakes.PO.13-47Paralytic shellfish poisoning andfood web contamination: aCalifornia coastal exampleSession: PO.13 - Regional eventsRJ Antrobus 1 , K Lefebvre 2 , VL Vigilant 1 ,IS Cheung 1 , CM Sutherland 1 , MWSilver 11 U of California, Santa Cruz, SANTACRUZ, CA, United States of America2 NOAA/NWFSC, SEATTLE, WA, UnitedStates of AmericaThe central California coast is ahighly productive, biodiverse regionfrequently affected by harmful algalblooms (HABs). In California,shellfish are regularly monitored forthe presence of Paralytic ShellfishPoisoning (PSP) and domoic acidtoxins to protect human consumers,and there are data here, as in othercoastal areas around the world,showing that additional marineorganisms are contaminated bythese same toxins. In the presentstudy our primary goal is tounderstand the extent to which PSPtoxins are contaminating localcommercial fisheries, if at all. Herewe investigate several commerciallyimportant species, includingplanktivorous pelagic fish, a varietyof flatfish, shellfish and rock crab.Three years of data on theparticulate saxitoxin concentrationsand the cell abundance ofAlexandrium catenella, the algaresponsible for PSP in this region,will be compared to the presence,or lack thereof, of toxins in theseorganisms. The presence ofsaxitoxin in several of theseorganisms suggests that PSP toxinsare more prevalent in Californiafood webs than previously thought.In addition to PSP, we will report onthe potential for these sameorganisms to be simultaneouslycontaminated with multiplephycotoxins, specifically domoicacid and/or okadaic acid.PO.05-40Content and profile of lipophilictoxins in plankton samplesduring two Dinophysis acutaoutbreaks, in Galician Rías (NWSpain)Session: PO.05 - Toxin analysisF Arevalo 1 , A Moroño 1 , Y Pazos 1 , JCorrea 1 , J Blanco 2127