12th International Conference on Harmful Algae

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INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006However, D. acuminata cannot begrown in cultures, while P. lima can,and therefore P. lima cultures areused widely in OA-related studies.In this study, a toxic P. lima strainwas grown in batch cultures under:1) N-NO 3 - sufficient, 2) N-NO 3-deficient, 3) P-PO 4 3- deficient and 4)N-NH 4 + sufficient conditions for 57days. Cell numbers, growth rates,chlorophyll a, OA concentrationsper cell and nutrient concentrationsin the culture media weredetermined at regular intervals.Phosphorus was exhausted in theP-deficient and N-NO 3 - sufficienttreatments after the end of thetypical exponential phase. Nitrogendecreased but was not exhausted inany treatment. In all treatments,maximum OA concentrations percell were observed after the end ofthe typical exponential phase, whengrowth rates decreased. However,the highest OA concentration in P.lima cells was found in the P-deficient treatment (2 times higherthan any other treatment), probablydue to further limitation of growthinduced by the heavy deficiency ofphosphorus.PO.11-05Talk to me – communicationbetween cyanobacteria via toxinsand promotion of oxidative stressSession: PO.11 - AllelopathyMaria Vasselikaki, StephanPflugmacherIGB, BERLIN, GermanyCyanobacteria are now common inmany freshwater lakes and riversthroughout the world and are knownto produce a variety of different,often toxic, secondary metabolites.The ecological use of thesemetabolites is still under discussion.One main idea on cyanotoxinsmight be the use as info chemicalsbetween algal cells in the interactionof algae and macrophytes. Thisstudy investigates the idea thatcyanobacterial toxins are acommunication tool betweendifferent cyanobacteria. Thiscommunication might be an indirectone, as cyanotoxins might be atrigger for the promotion of oxidativestress, generating reactive oxygenspecies, which are known to act ascell signals. The existence ofseveral antioxidative enzymes likessuperoxide dismutase, peroxidasesand catalases as markers foroxidative stress in Synechocystissp. will be shown as well as celldamage by extensive generation ofROS like lipidperoxidation due toexposure of Synechocystis sp. tothe cyanobacterial toxin microcystin-LR. As reactive oxygen species arealso thought to have an importantrole in the communication in cells,the main hypothesis presentedhere, is that the communicationbetween cyanobacterial speciesmight be mediated by ROS and theantioxidative cycle.PO.13-76Space distribution of potentiallyharmful species on the coast ofthe state of São Paulo, Brazil(July/04-May/06)Session: PO.13 - Regional eventsMC Villac, VAP Cabral, TO PintoUniversidade de Taubaté, TAUBATÉ, SP,BrazilThis study reports on the spacedistribution of potentially harmfulspecies on the coast of the State ofSão Paulo, Brazil (July/04-May/06),based on a survey carried out incooperation with the StateEnvironmental Agency andmariculture farms to provide299
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006information to protect tourism andsafety for shellfish consumption.The study of whole water and netsamples (20-µm mesh) revealed thepresence of Anaulus australis*,Asterionellopsis glacialis*,Cerataulina pelagica,Coscinodiscus wailesii, Guinardiadelicatula, Leptocylindrus minimus,Pseudo-nitzschia spp.*; Ceratiumfusus*, C. hircus, Dinophysisacuminata, D. caudata, D.rotundata, D. tripos, Gymnodiniumcatenatum, Noctiluca scintillans,Peridinium quinquecorne,Prorocentrum micans,Trichodesmium thiebautii andDictyocha fibula (* species thatreached 10 4 cells.L -1 and/or whoserelative abundance was over 50%of microphytoplankton count). Noblooms were visually observedduring this period. Anaulus australisand A. glacialis, species that havecaused surf blooms in the area,were indeed dominant in moreexposed beaches. Pseudo-nitzschiaspp., L. minimus, C. fusus and P.quinquecorne were some of themost abundant ones in moreprotected embayments, theenvironment where mariculturefarms are located. Interestingly, therecently introduced species toBrazilian waters, G. catenatum, wasfound to be more restricted to thesurroundings of a port terminal.Support: Biota-Fapesp, Cetesb,Butantan, CNPq-PIBIC.PO.01-13Petroleum production platformsas sites for the expansion ofciguatera in the northwesternGulf of MexicoSession: PO.01 - GeneticsTA Villareal 1 , S Hanson 1 , S Qualia 2 ,ELE Jester 3 , HR Grande 3 , RW Dickey 31 The University of Texas at Austin, PORTARANSAS, TEXAS, United States ofAmerica2 Fishtrackers, Inc., CORPUS CHRISTI,TEXAS, United States of America3 Food and Drug Administration, DAUPHINISLAND, ALABAMA, United States ofAmericaThere are records of ciguatera inthe northwestern Gulf of Mexico, aregion characterized by soft muddybottoms considered to be poorhabitat for the CTX sourcedinoflagellate Gambierdiscustoxicus. We examined petroleumproduction platforms andSargassum as potential substratefor G. toxicus and report a firstrecord of this species in the NWGulf of Mexico. All platforms (n=6 )and some of the Sargassum (n=3)examined harbored G. toxicus.Only minor toxicity (
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Dear participantWelcome to Denmark
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12th International Conference on Harmful Algae

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