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 2006shortest route. On the other hand,the discharge will generate radicalsin water and a bleaching effect canbe expected. There are many ionssuch as nitric acids, phosphoricacid, calcium, magnesium presentat the growth locality of algae, andthe electric conductivity is thereforerelatively good. By using ozone gasand hydrogen peroxide solution asreferences, the bleaching effect ofthe radicals on algae wasexamined.Different varieties of algae wereexposed to the DC high voltagedischarge pulse and to thecontinuous DC. A bleaching effectwas observed that seems to becaused by the radical induction inwater and movement of algae tothe electrode. A momentarytemperature rise and temperaturerise around the electrode, causedby the DC high voltage discharge,causes death of all algaeregardless of the variety.PO.09-06First detection of azaspiracidoutside European coastal watersSession: PO.09 - Toxin synthesis andchemical structure of toxinsHamid Taleb 1 , Paulo Vale 2 , RachidAmanhir 1 , Asia Benhadouch 1 , ReqiaSagou 11 Institut National de Recherche Halieutiq,CASABLANCA, Morocco2 Instituto Nacional de Investigação Agrár,LISBOA, PortugalOutbreaks of DSP have beenrecorded in summer 2004 and 2005at the same region of the northAtlantic coast of Morocco. DSPpositivesamples of musselsdetected by mouse bioassay werestored for further identification.Chemical analysis by HPLC/MSconducted in mussels harvestedfrom Dar Hamra (DH) and OuladGhanem (OG) showed thepresence of OA and DTX2.Analyses carried out in the samesamples revealed also the presenceof three main azaspiracidcongeners, namely AZA1, AZA2and AZA3. The discovery of thethree azaspiracid congeners hasbeen confirmed by mass spectracharacteristic of each toxin.Mussel samples harvested in 2004in OG and DH, showed the toxinprofile mainly composed of AZA2(75 and 100%) and AZA1 (15 to25%), but AZA3 was present attrace level. In 2005, the musseltoxin profiles from the same areaswere slightly different and therelative composition was AZA2 (80to 100%) and AZA1 (0 to 20%), andAZA3 at 10%. In both years AZA2was three to four times higher thanother congeners.PO.07-03Harmful algal blooms (HABs) inthe South China Sea and theirrelations to marine and coastalenvironmentsSession: PO.07 - Ecology andoceanographyDanling Tang 1 , SF Wang 2 , BP Di 2 , JYu 11 Chinese Academy of Sciences,GUANGZHOU, China2 South China Sea Institute of Oceanology,GUANGZHOU, ChinaHABs occur frequently in the SouthChina Sea (SCS), causing hugeeconomic losses in recent years.This study analyzed historical HABrecords for the period from 1980 to2003, focusing on four majorregions of the SCS: northern,southern, western and easternregions. HAB affected area spreadand its frequency increased, with289
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006high frequent periods in 1990-1991,1998 and 2002; the seasonal andannual variation, and the causativealgal species of HAB were alldifferent among the 4 regions. ManyHABs occurred in the northernregion, and two high frequent areaswere off the Pearl River and theManila Bay. Relatively, HABsoccurred frequently during March-May in the northern region and inJuly in the western region. Ascausative species Noctilucascintillans dominated in the northernregion, and Pyrodinium bahamensein both eastern and southernregions. Pyrodinium bahamenseand Noctiluca scintillans were thedominating species during 1980-2003, but more Phaeocystis cfglobosa and Alexandrium spblooms occurred 1991-2003. Thosevariations are related to regionalocean environments, such asreversed monsoon winds, riverdischarges, and upwelling, and alsoaffected by local conditions, such aseutrophication off the Peal Riverand in the Manila Bay.PO.13-42Dynamics of harmful algalblooms in the Ukrainian coastalBlack SeaSession: PO.13 - Regional eventsLudmila Terenko, Galyna TerenkoOdessa Branch of the Institute of Biology,ODESSA, UkraineDuring the last 10 years (1995–2005), 62 cases of microalgalblooms have been mentioned in theUkrainian coastal Black Sea.Basic main features of microalgalblooms in the Ukrainian Black Seaare:– The number of microalgal speciesthat produce blooms has increased(in the 1960s – 14, in 70-80s – 24,and in the 90s – 37 species);– Blooms of Skeletonema costatumare frequent (15 cases) at allseasons, which indicate high levelsof eutrophication. Maximal densitiesregistered were 50 10 6 cells l -1 ;– Within the last years, there hasbeen a simultaneous dominance of2-4 species of microalgae (S.costatum, Heterocapsa triquetraand Eutreptia lanowii);– There has been a development ofblooms caused by Chrysophyceae(Emiliania huxleyi, Apedinellaspinifera) and Euglenophyceae(Eutreptia lanowii, E. viridis);– Dinoflagellate species that did notcause blooms earlier (Gymnodiniumsimplex, Gyrodinium instriatum,Scrippsiella trochoidea) startedoccurring in this region;– The density of the invasive toxicspecies Cochlodinium polykrikoidesincreased from 0,7-10 3 cells l -1 in2001 up to 0,16-10 6 cells l -1 in 2005;– Potentially toxic diatoms (Pseudonitzschiaseriata, P. delicatissima)and dinoflagellates (Gymnodiniumaureolum, C. polykrikoides,Alexandrium pseudogonyaulax, A.tamarense) are frequentlydominant.The analysis of long-term changesof blooms in the Ukrainian BlackSea has shown an increase innumber of episodes from the end ofthe 90s.PO.12-16Does Gambierdiscus toxicus typematerial exist?Session: PO.12 - Taxonomy and phylogenyPA Tester 1 , MA Faust 2 , MWVandersea 1 , SR Kibler 1 , M Chinain 3 ,MJ Holmes 4 , WC Holland 1 , RW Litaker 11 National Ocean Service, NOAA,BEAUFORT, NC, United States of America2 Smithsonian Institution, WASHINGTONDC, MD, United States of America290
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Dear participantWelcome to Denmark
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12th International Conference on Harmful Algae

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