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 2006and molecular mechanismsrequired for roseobacters toestablish and maintain theirsymbiosis with dinoflagellates.Recently, we discovered thatSilicibacter sp. TM1040 producesan antibacterial compound,tropodithietic acid, which inhibitsmany other marine bacteria. Agenetic analysis has revealed thebiosynthetic pathway, as well as theregulatory circuit controllingtropodithietic acid expression. Theimplications of these data and theeffect of the antibiotic on theinteraction of roseobacters with theirdinoflagellate hosts, the structureand composition of bacterialcommunities, and the sulfur cycleare discussed.PO.13-28Phytoplankton tidal populationin Sfax coasts (South Tunisia)Session: PO.13 - Regional eventsS. Ben Khedhir 2 , Asma Hamza 1 , M.Ben Hassen 21 Institut National des Sciences et Techno,SFAX, Tunisia2 INSTM, SFAX, TunisiaDiversity variation of phytoplanktonin relation to daily tidal movementswas studied during four seasons atthe Sfax coast, Tunisia. Diatomsthat adhere to the bottom move within the water column and can reachthe surface. The most abundantgroups of the phytoplankton weredinoflagellates and somecyanophytes. Diatom abundancehas a lunar as well as a seasonalvariability, with the highestabundance corresponding to thecoldest days of the lunar cycle.Dinoflagellate species occurredgenerally in summer andproliferated specially on the lastdays of the lunar cycle, showing apreference for decreasedturbulence.PO.10-46Influence of salinity on thedimensions of the dinoflagellateProrocentrum minimum undercontrolled conditionsA Beran 1 , M Monti 1 , M Berden Zrimec 2 ,L Drinovec 2 , F Tamberlich 3 , A Zrimec 21 OGS, TRIESTE, Italy2 Institute of Physical Biology,GROSUPLJE, Slovenia3 Osservatorio Alto Adriatico, ARPA FVG,TRIESTE, ItalyProrocentrum minimum is aplanktonic dinoflagellate, which isconsidered potentially toxic tohumans. Associations between P.minimum blooms and toxicity arerare, but harmful effects were onvarious occasions observed inareas of P. minimum blooms.Prorocentrum minimum is thereforeconsidered a HAB (Harmful AlgalBloom) species and a species to bemonitored.Prorocentrum minimum cell sizeand shape are highly variable, anddifferent factors, including salinity,temperature and light intensity, havebeen suggested as putative causesfor this variability. Various authorshave suggested that different formscould be treated as morphotypeswithin the species, and relationshipsbetween P. minimum morphology,geographical distribution and salinityhave been hypothesized. To studythe possible relation between celldimension and salinity, P. minimumstrains from different geographicalareas were maintained in cultureunder controlled conditions. Growthcurves were monitored at threesalinities (8, 16 and 32 PSU) andcell dimensions analyzed. Celldimensions varied in the differentphases of growth, and the average133
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006cell size depended on the strainused and not on the salinity of thegrowth medium.PO.15-06PCR-based monitoring of toxicdinoflagellates in aMediterranean shellfish farmSession: PO.15 - MonitoringElena Bertozzini 1 , Luca Galluzzi 2 ,Antonella Penna 1 , Maria Giacobbe 3 ,Federico Perini 2 , AlessandraPigalarga 2 , Silvia Prioli 4 , MauroMagnani 21 Università degli Studi di Urbino, PESARO,Italy2 University of Urbino, FANO, Italy3 IAMC, CNR, MESSINA, Italy4 Coop. MARE, CATTOLICA, ItalyParalytic Shellfish Poisoning (PSP)and Diarrhetic Shellfish Poisoning(DSP) are syndromes caused byconsumption of shellfishcontaminated with toxins producedby several species of marinedinoflagellates. The standardmonitoring of shellfish farms for thepresence of harmful algae andrelated toxins usually requiresmicroscopic examination ofphytoplankton, bioassays and toxindetermination by HPLC. Molecularbiology techniques may be helpfulin the detection of target microalgaein contaminated mussels.A qualitative PCR assay for therapid detection of the generaAlexandrium and Dinophysis inseawater samples and musseltissues was developed. Thismethod was tested in a monitoringprogram in a shellfish farm alongthe NW Adriatic Sea and Ioniancoast of Italy during 13 months. Inseawater samples, the PCR methodhas generally shown a greatersensitivity compared to microscopeanalysis. Instead, the detection ofgenera Alexandrium and Dinophysisin mussel tissues poorly reflectedthe presence of thesedinoflagellates in the correspondingseawater samples. However, noDSP toxicity was found in musselsduring the entire monitoringprogram. Even if no correlation wasfound between the presence ofalgal DNA and toxin accumulation inmussels, the detection of harmfulalgae DNA could furnish an earlywarning for potential mussel toxicityPO.02-06Molecular physiology of thetoxigenic haptophytePrymnesium parvumSession: PO.02 - GenomicsS Beszteri 1 , U Tillmann 1 , M Freitag 1 , GGlöckner 2 , AD Cembella 1 , U John 11 Alfred Wegener Institute,BREMERHAVEN, Germany2 Leibniz Institute for Age Research, JENA,GermanyPrymnesium parvum is a toxichaptophyte, which forms harmfulblooms causing mass fishmortalities in brackish and marinewaters. A functional genomicapproach, within the EU projectESTTAL (expressed sequence tagsof toxic algae), is being used toinvestigate the basis of toxicity andgrowth regulation in this species.About 9,000 clones randomlyselected from a normalized cDNAlibrary were sequenced andapproximately 15,000 ESTs havebeen generated. The resulting~6230 contigs were analysed insilico and classified into functionalcategories. The ESTs served as thebasis for oligonucleotide design toproduce a microarray for geneexpression analysis. Prymnesiumtoxins, known as prymnesins, arelinear polyether compoundssuggesting that are produced or at134
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12th International Conference on Harmful Algae

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