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 2006will provide guidelines for monitoringactivities and will propose trainingcourses.PO.16-16Spatial and temporal distributionof dinoflagellate cysts inMalampaya Sound, Palawan,PhilippinesSession: PO.16 – Life cyclesF Furio 1 , V. Borja 1 , A. Rodriguez 2 , Y.Fukuyo 3 , K. Matsuoka 41 NFRDI, QUEZON CITY, Philippines2 OPA, Local Government of Palawan,PUERTO PRINCESA, Philippines3 University of Tokyo, TOKYO, Japan4 Nagasaki University, NAGASAKI, JapanDinoflagellate cyst mapping fromthe sediment surface wereconducted at 26 sampling stationsin two basins of MalampayaSounds, Palawan, from late 1998 tomid-2002. The study focused on thespatio-temporal distribution of cystsof the PSP-producing species,Pyrodinium bahamense var.compressum (Polysphaeridiumzoharyii in paleontologicalnomenclature) in the sediments, toassess the existence of possible'seed beds', that may serve assource of motile cells.Approximately 22-32 dinoflagellatecyst types were recorded,representing nine motile cell-definedgenera and one cyst-defined genus.The cyst assemblages found duringall monsoonal seasons werecharacterized by higher proportionsof autotrophic species, which werewidely distributed in the surfacesediments. A higher density ofPolysphaeridium zoharyii cysts,which occurred at several stationsalong the northwest side of theOuter Sound, were observed mostlyin deep, small embayments withrestricted inlets and muddysediments. The consistentappearance in time and space ofvery abundant P. zoharyii cysts inthe surface sediments of the OuterSound indicates potential 'seedbeds' for blooms of motile cells of P.bahamense.PO.06-05First record of a large-scalebloom of Thalassiosiracurviseriata Takano in the EastChina SeaSession: PO.06 - Population dynamicsYahui Gao 1 , Douding Lu 2 , Yuzao Qi 3 ,Jingzhong Zou 4 , Yang Li 1 , WenglingXie 1 , Junrong Liang 11 Xiamen University, XIAMEN, China2 Second Institute of Oceanography, SOA,HANGZHOU, China3 Jinan University, GUANGZHOU, China4 Chinese Academy of Science, QINGDAO,ChinaIn the East China Sea (ECS), alarge- scale bloom of Prorocentrumdonghaiense Lu from April to Junehas been a recurrent phenomenonin recent years. However, theProrocentrum bloom was rathersmall during the spring of 2005.Instead, there was a large-scalebloom of diatoms from late March tomid-April and from late May to Mid-June. The dominant species wasThalassiosira curviseriata Takano,together with Skeletonemacostatum (Greville) Cleve andChaetoceros debilis Cleve. The cellconcentration reached 10 6 cells/Land the bloom area extended forseveral thousand km 2 . Thalassiosiracurviseriata is a newly recordeddiatom species from China andblooms have never been reportedbefore. It mainly occurred in thesurface and subsurface waters andthe main distribution region in theECS was at 122°4'-122°13'E and27°42'-28°59'N. The highest cell177