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 2006assimilation and PST productionwere investigated in clonal batchcultures over the growth cycle.Growth rates increased withincreasing temperature andirradiance. Growth was depressedat lower temperature (20 °C) andirradiance (40 µmol photons m -2 s -1 ).The species showed no net growthat 10 µmol photons m -2 s -1 and atemperature of 15 °C, although cellsremained alive. Cellular toxin quotas(Qt) varied in the range 10 – 42 fmolPST cell -1 . Toxin production rate,Rtox increased with elevated light atboth 20 °C and 25 °C, withpronounced effect observed in theexponential phase (r 2 = 0.96). Rtoxalso increased significantly withincreased temperature (P < 0.05).The ecotypic variations in growthadaptations and toxin production ofthis Malaysian strain may reveal aunique physiological adaptation oftropical Alexandrium species.PO.14-15Exterminating model of toxicmicroalgae by electrochemicalmethodSession: PO.14 - MitigationH OgawaUniv. Tamagawa, MACHIDA-SHI TOKYO,JapanChemical methods to exterminatetoxic microalgae have beingdeveloped; but application of themethods in river head areas andfish farms is restricted.Exterminating toxic cyanobacteriais important because of increasingconcentrations of toxic compoundsthrough the food chains. A methodthat does not use chemicals ispreferred in riverhead areas andfish farms.The electrochemical method ischaracterized by the elution of ametallic ion from the structures.Large amount of calcium andmagnesium dissolved in water canbe obtained easily from shells andused for the machine structure.Iron, aluminum, sodium andpotassium are dissolved as ions inwater, but their concentrations arelow. Iron and aluminium chelateshave effective cohesion effects butthey spoil the taste of water.The performance of the modeldevice based on adsorption,precipitation (effect of cohesion)and surfacing was evaluated byusing the solution in which severalkinds of algae have been cultured.The toxic microalgae wereadsorbed and concentrated by thedevice. Different methods toremove the chemicals and theelements discharged from toxicmicroalgae were tested.PO.07-11Impact of Lingulodiniumpolyedrum blooms on thenorthern coast of Baja California,MexicoSession: PO.07 - Ecology andoceanographyE Orellana-Cepeda 1 , C Granados-Machuca 2 , M Avalos-Borja 3 , LAMorales-Zamorano 4 , M Valdez-Marquez 5 , D Parlange-Lamshing 5 , IGradilla-Martínez 31 Universidad Autónoma de Baja California,SAN YSIDRO, United States of America2 FCM, UABC, ENSENADA, BajaCalifornia., Mexico3 CCMC, UNAM, ENSENADA, Mexico4 FCAS, UABC, ENSENADA, BajaCalifornia, Mexico5 Maricultura del Norte SRL de CV,ENSENADA, MexicoRed tides occur annually on thecoast of Baja California (BC) and aphytoplankton monitoring programwas therefore initiated in 2003 to253
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006detect potentially harmful algaebefore they impact fish farms.Phytoplankton samples were takenusing a segmented pipe. The mostimportant red tide event of the last20 years occurred in spring/summer2005 and the dominant species wasLingulodinium polyedrum. Amaximum value of 17 500 000cells/L was recorded for this speciesat Salsipuedes, BC, in August, whilevalues of 4 500 000 and 4 990 000cells/L were obtained at PuertoEscondido, BC, in June and July,respectively. In addition to the directimpact on the bottom fauna when L.polyedrum attained a density of 6300 000 cells/L in a shallow area ofEnsenada Bay in June, secondaryeffects were observed. In October,in Ensenada Harbour and CoralMarina, tons of anchovy (Engraulismordax) were infected byAcinetobacter vaumannii and died.Subsequently, unusual tunamortalities occurred in farms atdifferent localities. Paralytic andamnesic shellfish poisoning werenot detected in the dead tuna. TheL. polyedrum bloom could haveplayed a role in these complex toxicoutbreaks.Akashiwo, Alexandrium,Dinophysis, Karenia, Karlodinium,Lingulodinium, Pfiesteria,Prorocentrum and Protoceratium,and to a lesser extent toHeterokontophyta, represented byChattonella, Fibrocapsa andHeterosigma, or Haptophyta, withharmful representatives ofChrysochromulina, Phaeocystis,Platychrysis, Pleurochrysis andPrymnesium. Some species suchas Heterosigma akashiwo andPhaeocystis globosa appearrecurrently and, in many cases, atelevated densities. The remainingspecies appeared in very lowconcentrations or were identified incultures of natural samples togetherwith the dinoflagellates Karlodiniummicrum and Karlodinium sp., andthe haptophytes Prymnesiumparvum, Chrysochromulinabrevifilum, Pleurochrysispseudoroscoffensis andPlatychrysis pienaari. In this study,we present the relationship betweenthe physical environment, withemphasis on haline or thermalstratification, and the presence ofthese harmful species along thelongitudinal axis of the estuary.PO.13-20Harmful flagellates in the NervionRiver EstuarySession: PO.13 - Regional eventsE Orive, A Laza, S SeoaneUniversity of the Basque Country, LEIOA,SpainSeveral potentially harmful flagellatespecies have been identified in theNervion River Estuary, a eutrophicwarm temperate estuary which hasexperienced in the last years amarked improval of water quality.Species belong mostly toDinophyta, including the generaPO.13-61Bloom-forming Pseudo-nitzschiaspecies (Bacillariophyceae) fromthe southeastern coast of Russia:morphology, distribution andtoxicitySession: PO.13 - Regional eventsTatiana OrlovaInstitute of marine Biology,VLADIVOSTOK, RussiaA survey for species of thepotentially toxic diatom genusPseudo-nitzschia was carried out onthe south-eastern coast of Russia:Peter the Great Bay (within the Sea254
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12th International Conference on Harmful Algae

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