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 2006The taxonomy of the genusProrocentrum is currently in a stateof flux. McLachlan et al. (1997)suggested reinstatement of thegeneric name Exuviella for somespecies presentl included inProrocentrum. To further explorethe taxonomy of ‘Prorocentrum’species we sequenced the nuclearencodedlarge subunit (LSU)ribosomal DNA gene of someProrocentrum species isolatedmainly from Malaysia. Molecularphylogenetic analyses revealed afew lineages which could be dividedinto several groups supported bymorphological characters such asthe presence of trichocysts,ornamentation of the periflagellararea, ornamentation of valvesurface and type of toxin.Additionally, the periflagellar area oftwo Prorocentrum species, viz. P.emarginatum and P. concavum,was studied by serial sectioning inthe TEM to examine whether thischaracter is a useful taxonomiccharacter for inferring relationship atthe species level. The platelets werelabelled according to Taylor’sscheme. The results showed thatthe platelets of the twoProrocentrum species were uniformin number, arrangement andornamentation such as flanges andcollars extending from the platelets.We conclude that additional genesequence data are needed beforethe taxonomy of Prorocentrum canbe finally settled with anyconfidence.PO.10-15Interaction effects of highirradiances and nutrientconcentrations on thecyanobacterium Nodulariaspumigena from the Baltic SeaSession: PO.10 - Ecophysiology &AutecologyM Mohlin, V Lindberg, A WulffMarine Ecology, GÖTEBORG, SwedenNodularia spumigena is one of thedominant species during thecyanobacterial blooms in the BalticSea. The blooms occur during latesummer, a period with increasedirradiances, low DIN:DIP and stablewater-column stratification. It hasbeen observed that increasingirradiance has a stimulating ratherthan an inhibitory effect on N.spumigena. Because of its ability fornitrogen fixation, a low DIN:DIPwould not be expected to negativelyaffect N. spumigena. In this studywe tested the interaction effect ofhigh irradiance (PAR andUVBR+UVAR) and differentDIN:DIP on a strain of N.spumigena. The laboratoryexperimental period was 17 daysand the cultures were kept in semicontinuousgrowth and exposed toPAR and PAR+UVBR+UVAR.Variables measured: nutrientconcentrations (PO 4 - , NO 3 - ) growth(light microscope), photosyntheticcapacity (phyto-PAM, Walz),content and composition ofphotosynthetic pigments (HPLC),phycobilin pigments(spectrophotometer), UV-absorbingcompounds (HPLC), and nodularin(HPLC). The experiment is currentlyrunning and the results will bepresented at the conference.241
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006PO.06-14The return of Gymnodiniumcatenatum after 10 years: bloominitiation and transport off thePortuguese coastSession: PO.06 - Population dynamicsMT Moita 1 , S Palma 1 , PB Oliveira 1 , TVidal 2 , A Silva 1 , MG Vilarinho 11 INIAP/IPIMAR, LISBOA, Portugal2 INIAP/IPIMAR-CRIP Centro, AVEIRO,PortugalThe last bloom of Gymnodiniumcatenatum on the western Iberiancoast was reported in 1995although some cells were detectedin the following years. Previousstudies on the species dynamicssuggest that bloom initiationoccurred in Lisbon Bay in aretention area related to the CapeRoca upwelling plume. During 2005,in this Bay, G. catenatum wasobserved up by the monitoringprogramme from mid-July. InAugust/September, a survey carriedout on the area showed that G.catenatum was distributed (>500cells/L) along a strong thermal front,resulting from the interaction of thecolder upwelled waters of CapeRoca plume and oceanic waters.Satellite-derived sea level anomalymaps revealed that during thecruise, and for at least three weeksbefore, the off-shelf surfacecirculation was dominated by thepresence of two counter rotatingmesoscale eddies, responsible for astrong northeastward flow of warmoceanic waters into the survey area.During autumn, the monitoringprogramme allowed the following ofa northward shift of the populationrelated to a poleward surface flow.On 29 November, G. catenatumreached the maximumconcentration (43x10 3 cells/L) onthe Aveiro coast and lasted innorthern Portuguese waters untilJanuary 2006.PO.05-06First evidence of DTX2 inFrance: detection by LC-ESI-MS2during 2004-2005 south Brittanyphytoplankton bloomsSession: PO.05 - Toxin analysisFlorence Mondeguer, Elizabeth Nézan,Dominique Le Gal, Claire MarcaillouIFREMER, NANTES, FranceOur study relates to phytoplanktonsamples collected during one yearon the southern Brittany coast(05/10/04-07/18/05). For eachsample, we worked at the sametime on taxonomic and toxin profiles(lipophilic phycotoxins). To ensurethat all samples were treatedidentically for optimumreproducibility, all phytoplanktonextracts were quickly purified onSolid Phase Extraction (SPE), witha robotic station (ASPECXli,Gilson). The simultaneousidentification and quantification oftoxin profiles were achieved byusing a liquid chromatography–tandem mass spectrometry (LC–MS/MS) with electrospray ionisation(+) and monitoring of daughter ionsin multiple reaction modes. Theresults obtained in the taxonomicanalysis showed that Dinophysisacuminata was the predominantspecies (75%). The toxin analysis ofthe samples by LC-ESI-MS/MSshows that okadaic acid (AO) is theprincipal lipophilic toxin. Howeve,r02/11/04 a monospecific samplecontaining 75% of Dinophysisacuta, was an exception to theuniformity of the profiles observedduring this year. The LC-MS2analysis of this plankton net towshows the rare presence of DTX2(dinophysistoxin-2). For this sample242
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12th International Conference on Harmful Algae

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