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 2006species can reach in bi-culturingexperiments.PO.07-15The role of nutrients on springand summer algal blooms in theEast China SeaSession: PO.07 - Ecology andoceanographyJiangtao Wang, Chuansong Zhang,Xiaoyong Shi, Xiulin WangOcean University of China, QINGDAO,ChinaDiatom and dinoflagellate bloomswere investigated in the East ChinaSea 2002-2005. When diatomblooms started in spring, thephosphate concentration decreasedfrom about 0.6 μM to 0.2 μM, whichsuggests that phosphate mighthave been the limiting factor for thediatom blooms. At the succeedingdinoflagellate bloom, the phosphateconcentration decreased to 0-0.1μM. Prorocentrum donghaiense Luwas capable of growing even atphosphate concentrations below 0.2μM.Nitrate concentration showed agradual decrease, concomitant withthe algal bloom development. At theend of Prorocentrum donghaiensebloom, the average nitrateconcentration was about 1.5 μM inthe surface water. We hypothesizedthat dinoflagellate blooms could notbe maintained when nitrateconcentrations were lower than theabove-mentioned level.It was concluded that phosphateconcentrations are essential fortriggering the blooms, nitrateconcentrations determine theduration and scale of the bloom,and silicate concentration and Si/Nratios influence which species willbe dominant. By determiningnutrient concentrations, algalblooms in the East China Sea canbe forecasted relatively accurately.PO.15-22Application of a MultiparameterMonitoring System (YSI) instudies of large-scale red tidesin the East China SeaSession: PO.15 - MonitoringYF Wang 1 , DD Zhu 2 , MJ Zhou 1 , RC Yu 11 Institute of Oceanology, CAS, QINGDAO,China2 Second Institute of Oceanography, SOA,HANGZHOU, ChinaThe multiparameter monitoringsystem (from YSI), coupled with aglobal positioning system (GPS)and an automatic meteorologicalstation, has been used in fieldcruises to study the large-scale redtides in the East China Sea,supported by the on-goingCEOHAB project. Parametersincluding chl.a, temperature,salinity, turbidity, dissolved oxygen,pH, and depth were recorded withthe YSI system during the cruisesduring the last five years. Theresults suggested that there weregood correlations between themeasured chl.a levels by thesystem and the analytical results ofchl.a from fluorescencespectrometer and cell counting bymicroscopy, during the red tides ofProrocentrum donghaiense, Kareniamikimotoi, Skeletonema costatum,and Thalassiosira sp. The spatialand temporal distribution pattern ofthe red tides, even the subsurfacethin layer distribution of highconcentrated microalgae, could bedepicted with the system. Data onchl.a, temperature, salinity anddepth derived from the system wereused successfully to elucidate thehydrological effects of watermasses and ocean currents on thedynamics of large scale red tides.303
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006Therefore, data from the YSIsystem could well support thestudies on the dynamics andmechanism of large scale red tidesin this region.PO.12-05Do you know this dinoflagellate?Session: PO.12 - Taxonomy and phylogenyJL Wolny 1 , MJ Garrett 2 , KA Steidinger 11 Florida Institute of Oceanography, SAINTPETERSBURG, FLORIDA, United Statesof America2 Fish and Wildlife Research Institute,SAINT PETERSBURG, FLORIDA, UnitedStates of AmericaDuring routine ballast watermonitoring for harmful algae wediscovered an unusualdinoflagellate. The cyst wasobtained by sediment sampling aballast tank of the cargo containership ‘Southern Fighter’, docked atthe Port of Tampa. In culture, thisdinoflagellate spends the majority ofits life cycle in a non-motile stage.The non-motile stage is twice thesize of the vegetative cell. It issmooth walled, with the exception ofthe apical pore area, and gathers inlarge clusters that are visible to thenaked eye. The vegetative cell is ascrippsielloid dinoflagellate with thefollowing plate tabulation: Po, x, 4’,3a, 7', 6c, 6s, 5’', 2''. The vegetativecell is characterized by a deeplyinvaginated and narrow 1’ plate,unique apical pore complex, anddeep sulcus. The vegetative cellshave been morphometricallycompared to Bysmatrum,Calciodinellum, Ensiculifera,Pentapharsodinium, Peridiniella,Peridinium, Protoperidinium, andScrippsiella with no definitive match,although they most resembleBysmatrum. We presume thisdinoflagellate is a benthic specieslike Bysmatrum, but it lacks theanterior intercalary plate patterntypical of that genus. The routineports of call for this ship, whereballast water exchanges took place,were Antwerp, Belgium, Terneuzen,Netherlands, and Uddevalla,Sweden.PO.10-06Interaction effects of nutrientlimitation and UV radiation onNodularia spumigena - anoutdoor experimentSession: PO.10 - Ecophysiology &AutecologyA Wulff 1 , M Mohlin 2 , V Lindberg 21 Göteborg University, GÖTEBORG,Sweden2 Marine Ecology, GÖTEBORG, SwedenNodularia spumigena is one ofseveral toxin-producingcyanobacteria in the Baltic Sea. Itproduces the hepatoxin nodularin, atumour promoter known to havekilled wild and domestic animals.Nodularia spumigena blooms occurduring late summer, a period withstrong light, calm weather andstable water-column stratification.Due to its ability to fix atmosphericnitrogen, N. spumigena does notdepend on this macronutrient in thewater. Instead it is generallybelieved that growth of N.spumigena is limited byphosphorus. In a mesocosmexperiment we will study theinteraction effects of N and Plimitation, and UV radiation.Cultures of N. spumigena areexposed to, or shielded from,natural levels of UV radiation in 5-Laquaria with and without N- and P-limiting conditions, repectively. Theexperiment will be run for ca 30days (July, 2006). Variables to beanalysed are related to growth andphotosynthetic activity as well as thecontent of nodularin and UVabsorbingcompounds.304
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12th International Conference on Harmful Algae

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