12th International Conference on Harmful Algae

INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006PO.01-19Distribution and diversity oftoxigenic Microcystis blooms: atemperate-tropical comparisonSession: PO.01 - GeneticsWGA Vyverman 1 , I van Gremberghe 1 ,T Asmelash 2 , T Dejenie 2 , J vanWichelen 1 , K van der Gucht 1 , L deMeester 3 , A Wilmotte 41 Ghent University, GENT, Belgium2 Mekelle University, MEKELLE, Ethiopia3 Catholic University Leuven, LEUVEN,Belgium4 Université de Liège, LIÈGE, BelgiumCyanobacterial blooms wereinvestigated in shallow lakes andponds in Belgium and microdams inEthiopia during respectively threeand two consecutive years. DGGEprofilingof 16S rDNA revealed thatthe most dominant bloom-forminggenus was Microcystis in bothcountries. DGGE-profiling ofMicrocystis-specific16S-23S rDNAITS revealed a significant diversitywithin and among sites. PCR wasused to detect the presence of mcygeneswithin blooms and revealedthat most blooms containedtoxigenic strains. Phylogeneticanalysis of ITS-sequences wasused to relate toxigenic capacity tothe genetic composition of blooms.Multivariate analyses were used torelate bloom composition to climaticcondition, nutrient status andbiological characteristics.PO.15-02The potentially harmful algae andHABs in the East China Sea byregular red tide monitoringprogrammeSession: PO.15 - MonitoringJinhui Wang, R Xu, XS Cheng, XQHuangEast China Sea Environmental Monitoring,SHANGHAI, ChinaAbout 435 red tides are recorded inthe East China Sea since the1930s, which amounts to 54% oftotal red tides in China. Amongthem, 43 toxic HABs were recorded;the causing species includeAlexandrium tamarense, Kareniamikimotoi, Heterocapsacircularisquama, Cochlodinium sp.and Karenia brevis. The HABs ofKarenia mikimotoi in 2005 causeddirect loss of about RMB 20 millionby killing cultured fish (red drum,genuine porgy) and abalone. Thereare about 24 recorded blooms ofKarenia sp. in the East China Seasince 1980s, most of them havedetrimental influence, and thebloom of Karenia sp. has atendency to increase in frequencyand to be spreading from south tonorth. According to regularphytoplankton monitoring since2002, there are 19 potentially toxicalgae: PSP-causing algae(Alexandrium catenella,Alexandrium tamarense); DSPcausingalgae such as Dinophysiscaudata, Dinophysis fortii,Dinophysis acuminate; NSPcausingalgae, Karenia brevis, ASPcausing algae such as Pseudonitzschiamultiseries, Pseudonitzschiamultistriata, Pseudonitzschiadelicatissima, and other 8toxic algae such as Heterocapsacircularisquama, Cochlodinium sp.,Fibrocapsa japonica etc. Amonitoring scheme of toxic algaeand biotoxin is put forward.PO.02-04A proteomic approach to harmfulalgal bloom researchSession: PO.02 - GenomicsDa-Zhi Wang 1 , Hua-Sheng Hong 1 , LeoLai Chan 2 , John Hodgkiss 21 Xiamen Univeristy, XIAMEN, China301