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 2006through increased developmentinfluence the health status andwater quality within this system.Supported by Virginia Dept.Environmental Quality, VirginiaDept. Health, and USEPA.PO.08-15Antimicrobial and cytotoxicassessment of marinecyanobacterial extractsSession: PO.08 - ToxicologyMR Martins 1 , MF Ramos 2 , L Herfindal 3 ,K Skærven 3 , VM Vasconcelos 21 Escola Superior de Tecnologia da Saúde,PORTO, Portugal2 CIIMAR, PORTO, Portugal3 Department of Biomedicine, BERGEN,NorwayMarine cyanobacterial strainsisolated from Portuguese rockyshores and adapted to large-scalelaboratory culture were screened forbiological activities. Seventeenstrains belonging to the generaCyanobacterium, Oscillatoria,Synechocystis and Synechococcuswere tested for antifungal andantibacterial activity and ten ofthese strains were screened forcytotoxic activity against primary rathepatocytes and HL-60 cells.Extracts of different polarities weretested. No inhibitory effects werefound against the fungi Candidaalbicans and a wide range of Gramnegativebacteria. Ninecyanobacterial strains were found tohave antibiotic activity against twoGram-positive bacteria, Clavibactermichiganensis subsp. insidiosumand Cellulomonas uda. Slightapoptotic effects were observed inprimary rat hepatocytes whenexposed to aqueous extracts but nosignificant apoptotic effects wereregistered when cells were exposedto organic extracts. A highpercentage of apoptotic cells wereobserved for HL-60 cells whentreated with the cyanobacterialorganic extracts. Our datademonstrated that marinecyanobacteria extracts causeinhibition of Gram-positive bacteriaand induce apoptosis in eukaryoticcells. The different activity indifferent extracts suggests differentcompounds with different polarities.Cyanobacterial strains of the generaSynechocystis and Synechococcusproved to be a potential source ofbioactive compounds.PO.13-86The genus Ostreopsis in therecreational waters along theCatalan Coast and BalearicIslands (NW Mediterranean Sea)Session: PO.13 - Regional eventsM MasoInstituto Ciencias del Mar, BARCELONA,SpainTwo Ostreopsis species have beendetected in the Mediterranean Sea,Ostreopsis cf. siamensis and O.ovata. Both are toxic (palytoxinanalogues) and live looselyattached to macroalgae, althoughthey have the availability to detachand swim in the water column.Respiratory problems have beenrecently related with theseorganisms in some Mediterraneancoastal areas. In August 2004, 200people were affected by respiratorydifficulties in the central part of theCatalan coast. Studies on thedistribution of these epiphyticdinoflagellates are scarce and it isan urgent task to be done due to itspotential danger. During the touristseason, an extensive monitoringassociated with bathing beacheswas performed in twoMediterranean coastal regionsexploited for recreational use.235
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006Sampling was performed in 240beaches along the Catalan coast(CSIC_Agència Catalana del’Aigua) and 80 beaches along theBalearic Islands (CSIC_Conselleriadel Govern Balear). Resultsrevealed the widespread distributionof the genus Ostreopsis in thebathing waters of these tworecreational coastal areas.Concentration of the organismaround 200 cells l -1 is a commonsituation in the water column and inseveral occasions concentrations ashigh as 10 4 cells l -1 have beendetected.PO.01-22Testing the hypothesis oftemperate Asia origin ofAlexandrium catenella in ThauLagoon (NW Mediterranean)using microsatellite markersSession: PO.01 - GeneticsE Masseret 1 , S Nagai 2 , D Grzebyk 1 , BGenovesi-Giunti 1 , B Lasserre 1 , MLaabir 1 , D Alrivie 1 , Y Collos 1 , AVaquer 1 , P Berrebi 11 University Montpellier II, MONTPELLIER,France2 National Research Institute of Fisheries,HIROSHIMA, JapanA massive bloom of Alexandriumcatenella associated with paralyticshellfish poisoning first occurred inThau Lagoon (FrenchMediterranean) in 1998. Since then,A. catenella has been repeatedlyblooming in this lagoon. Morerecently, A. catenella blooms alsooccurred for the first time in severalareas in the NW Mediterranean(Spain, Italy) where this speciesseems to be expanding. On thebasis of genetic analyses of A.catenella strains isolated from theNW Mediterranean, using rDNAmarkers, it was suggested that thisMediterranean population couldhave been introduced fromtemperate Asia (e.g. Japan) throughballast waters. In order to test thishypothesis, we carried out a geneticanalysis of French Mediterraneanand Japanese strains usingmicrosatellite markers (MS). MSsequences are highly polymorphicmarkers, which are nowadayswidely used to study populationgenetics in terrestrial and aquaticmacroorganisms. This approachhas been recently used toinvestigate genetic diversity inphytoplankton. MS have beendeveloped in A. catenella (Nagai etal., Molecular Ecology Notes 6:120-122, 2006). Using these markers,we will present the comparativeanalysis of A.catenella strainsisolated from Thau Lagoon (fromblooms and resting cysts) and fromJapanese waters. The data arediscussed with respect to analysesbased on rDNA data.PO.11-06Inhibitory effects of diatoms onthe growth of the dinoflagellateAkashiwo sanguineaSession: PO.11 - AllelopathyT Matsubara, S Nagasoe, Y Yamasaki,T Shikata, Y Shimasaki, Y Oshima, THonjoGraduate School, Kyushu University,FUKUOKA, JapanResults of phytoplankton highfrequencystudies over four years inHakozaki Harbour, Hakata Bay,Japan, showed that thebacillariophytes Skeletonemacostatum and species of the genusChaetoceros are dominant in springand summer, whereas Asterionellajaponica is dominant in the fall. Onthe other hand, the density ofAkashiwo sanguinea began toincrease during early fall, when the236
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12th International Conference on Harmful Algae

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