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 20063 University of Tasmania, LAUNCESTON,AustraliaThe toxic dinoflagellateGymnodinium catenatum hasformed recurrent blooms in theHuon Estuary, south east Tasmaniasince the mid 1980s. Phytoplanktongrowth in the Huon Estuary isprimarily limited by nitrogen (N). Tobetter understand the bloomdynamics of G. catenatum,preference for and growth on:nitrate (NO3 - ), ammonium (NH4 + )and urea was investigated in aseries of laboratory experiments.Results demonstrated that G.catenatum grows equally well on:nitrate, ammonium and urea, buttakes them up in this order: NH4 + >NO3 - > urea. In addition, G.catenatum is capable of initialspecific N uptake rates ~20 times itsspecific growth rate i.e. 'surgeuptake'. The ability of G. catenatumto grow equally well using all threeN sources coupled with 'surgeuptake' capability are likely to playan important role in its dominance inthe Huon Estuary and otherecosystems.PO.13-33Prolonged toxicity ofScrobicularia plana after PSPevents and its relation toGymnodinium catenatum cystconsumption and toxindepurationSession: PO.13 - Regional eventsML Artigas 1 , A Amorim 2 , P Vale 3 , SSGomes 3 , MJ Botelho 3 , SM Rodrigues 31 University of Lisbon, PÓVOA DE STA.IRIA, Portugal2 Instituto de Oceanografia, LISBOA,Portugal3 IPIMAR/INIAP, LISBOA, PortugalIn contrast to other species ofbivalves such as blue mussels(Mytilus galloprovincialis) andcommon cockles (Cerastodermaedule), the clam Scrobicularia planahas been observed to retain PSPtoxicity for long periods (more than1 year) after a bloom event.Because this species is a depositfeeder, consumption ofGymnodinium catenatum cysts fromthe sediments was suggestedpreviously as one possibleexplanation for this fact. In autumn2005, a bloom of G. catenatum wasdetected along the NW coast ofPortugal. The gut contents of S.plana from affected areas wereexamined for dinoflagellate cystsduring and after the bloom. ThePSP content in bivalves wasfollowed by HPLC. The presence ofcysts was maximal during the bloomand then deminished, even thoughPSP toxicity never decreased tovalues below the regulatory safelimit. Depuration experiments withS. plana, blue mussels andcommon cockles revealed thatelimination of toxins in S. plana wasalmost non-observable within 1week, while in mussels or cocklesreduction to half the toxin level tookplace. These results suggest thatcysts are not responsible for theobserved prolonged toxicity, butinstead a slow depuration rate.PO.10-35Nitrogen dynamics of Pseudonitzschiacuspidata from the U.S.Pacific NorthwestSession: PO.10 - Ecophysiology &autecologyME Auro 1 , WP Cochlan 1 , VL Trainer 21 Romberg Tiburon Center, SFSU,TIBURON, United States of America2 Northwest Fisheries Science Center,NOAA, SEATTLE, United States ofAmerica129
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006The growth capabilities of thetoxigenic diatom species Pseudonitzschiacuspidata, isolated fromthe Juan de Fuca Eddy regionduring Fall surveys of the ECOHAB-PNW project in 2004 and 2005,were examined in non-axenic, semicontinuous,batch cultures enrichedwith 40 µM nitrate, 40 µMammonium or 20 µM of urea as thesole nitrogen source. Experiments,conducted at both high (120µmol·m -2·s -1 ) and low (40 µmol· m -2·s -1 ) photosynthetic photon fluxdensities (PPFDs), demonstratethat P. cuspidata grew significantlyfaster at the higher PPFD, butshows no preference for onenitrogen source over the other ateither PPFDs. Exponential growthrates (determined using cellabundance over time) andparticulate domoic acid content(using ELISA) did not significantlydiffer as a function of the nitrogengrowth substrate. In contrast tomost previous studies using othercultured Pseudo-nitzschia species,the particulate DA per cell averaged60% greater during exponentialgrowth compared to stationarygrowth of P. cuspidata, regardlessof nitrogen source or PPFD. Theseresults demonstrate the capability ofthis diatom to grow equally well onboth oxidized and reduced forms ofnitrogen, although our fieldobservations have generally foundgreatest cell abundances in thenitrate-rich upwelled waters of theJuan de Fuca Eddy.PO.13-65Cyanobacterial toxins in thelakes located in the Riga City andits surroundingsSession: PO.13 - Regional eventsMaija Balode, Ingrida Purina, IevaBarda, Solvita StrakeLatvian Institute of Aquatic Ecology, RIGA,LatviaThe coastal zone of the lakeslocated in the Riga City and itssurroundings are densely inhabitedand widely used for recreation,fishing activities and as drinkingwater source for Riga City. Due tostrong anthropogenic impact,intensive blooms of potentially toxicalgae in the lakes are observedevery summer, however no regularanalysis of algal toxins has beencarried out. In this study weattempted to quantify the toxinconcentrations in different stages ofcyanobacterial blooms in 2002-2005. Samples for cyanobacterialtoxin analysis were collected fromalgae surface accumulations.Presence of toxins was detected byprotein phosphatase inhibitionassay (PPIA), enzyme linkedimmunosorbent assay (ELISA) andHPLC. The most frequentlyoccurring species in all sampleswere Microcystis spp., Anabaenaspp. and Aphanizomenon flosaquae,composing 50 -95% of thetotal phytoplankton biomass. Thehighest concentrations ofmicrocystins were detected in thelakes Mazais Baltezers and LielaisBaltezers, ranging from 300- 1600ng/mg dw during the maximum ofthe cyanobacterial bloom. Theseresults suggest that more publicattention should be paid to theproblem of HAB, to avoid possibleintoxication cases.PO.08-04PSP toxin profiles duringdifferent growth phases inGymnodinium catenatum strainsisolated from the Gulf ofCalifornia, MexicoSession: PO.08 - Toxicology130
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INTERNATIONAL SOCIETYFOR THE STUDY
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12th International Conference on Harmful Algae

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