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 2006mikimotoi and P. donghaienseblooms. In the same way, somestimulatory substances excreted byK. mikimotoi on P. donghaiensemay play an important role in thesuccession from K. mikimotoi bloomto P. donghaiense bloom.PO.13-13The low temperaturecharacteristics of the East ChinaSea in early spring of 2005 andits influence on HABsSession: PO.13 - Regional eventsDedi Zhu 1 , Xianwei Bu 1 , YunfengWang 2 , Weiyi Xu 1 , Jilan Su 11 Second Institute of Oceanography, SOA,HANGZHOU, China2 Institute of Oceanography, CAS,QINGDAO, ChinaTemperature characteristics of aHAB-frequent area in the EastChina Sea in early spring 2005 andits influence on a large-scale HABare analyzed, based on survey datafrom 2002~2005 and some relatedhistorical meteorological data. Lowtemperature characteristics wereobvious in the HAB- frequent areaduring the early Spring (early April)2005; water temperature was about2-3 °C lower compared to the sameperiod of 2004 and it quickly rosefrom 10 °C to 17 °C during the lasttwenty days of April. Low airtemperature in March and largedischarge of the Yangtze river inWinter (Jan. to Mar.) in 2005 are themain causes for the lowtemperature in this sea area. Thelow temperature may have been animportant factor for the occurrenceof a dinoflagellate HAB in the spring2005 as opposed to the spring2002~2004.PO.07-12Numerical simulation ofcirculation and its application inred tides in the Changjiang RiverEstuary and adjacent sea areasSession: PO.07 - Ecology andoceanographyLS Zhu, XH ChenSouth China Sea Institute of Oceanology,GUANGZOU, ChinaBased on the COHERENS, a threedimensionalbaroclinic model for thesummer of East China Sea wasestablished with the sigmacoordinatein the vertical directionand spherical coordinate in thehorizontal direction. The circulationpatterns of the Kuroshio Current,the Taiwan Warm Current, theTsushima Current, the ChangjiangDiluted Water and the coastalcurrents were successfullysimulated in this model. Thecalculated results are fairlyconsistent with previousobservations and studies. Based onthis baroclinic current field, wesimulated the Lagranian particlestracking to estimate possible originsof the regions where red tidesfrequently occurred in theChangjiang River Estuary andadjacent sea areas. Does seedingfrom cysts take place from red tidealgae in the seabed of the TaiwanStrait, the offshore area of Fujianand Zhejiang Provinces and thenortheast Taiwan Island, to theChangjiang River Estuary andadjacent sea areas. Field data areneeded to confirm this. The buildingof a numerical model based on theCOHERENS to simulate theLagrangian particle tracking forestimating the source of the redtides is the first attempt of this kindin China.313
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006PO.01-16Diversity in the genusSkeletonema: an overviewSession: PO.01 - GeneticsA Zingone, D Sarno, WHCF KooistraStazione Zoologica A. Dohrn, NAPLES,ItalyRecently, the genus Skeletonemahas undergone profound revision,which has revealed four newspecies within one of the mostconspicuous marine phytoplanktontaxa, S. costatum. Morphologicaland molecular analyses have nowbeen extended to more than 150strains from all over the world withthe aim of a) assessing the diversityof the genus, b) investigating themorphological and molecularvariability of the different species,and c) depicting their geographicranges. This study has uncoveredlive material of S. costatum and S.grevillei, which were previously onlyknown from their type materialcollected in Hong Kong waters 130year ago. In addition, a new specieshas been found in material from thePacific Ocean. The analysis ofstrains from different areas hasrevealed consistent genetic diversity(LSU data) within some species(e.g. S. dohrnii, S. menzelii, S.tropicum), which still retainmonophyly and separation fromclosely related species. Otherspecies (S. marinoi and S.japonicum) are insteadhomogeneous over their range.Despite the limited number ofstrains available for each species,geographic patterns arerecognisable, which differ amongspecies and among geneticallydistinct populations withinmorphologically defined species.The possible origin and ecologicalsignificance of cryptic diversity inSkeletonema is discussed.314
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Dear participantWelcome to Denmark
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12th International Conference on Harmful Algae

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