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 2006growth interactions strongly suggestthe involvement of allelopathicsubstances secreted into eachmedium by both species. Finally,growth of S. costatum and H.akashiwo in the bi-algal cultureswas simulated using a mathematicalmodel. This interaction modelindicated that, as time passes, S.costatum and H. akashiwo steadilyapproach a stable equilibrium pointof about 3.4 10 5 cells/ml and 4.8 10 5cells/ml, respectively, when the twospecies coexist.PO.09-09Laboratory and field studies onharmful effects of large-scaleHABs in the East China SeaSession: PO.09 - Toxin synthesis andchemical structure of toxinsT Yan 1 , MJ Zhou 1 , TJ Jiang 2 , YinlinZou 31 Institute of Oceanology, CAS, QINGDAO,China2 Institute of Hydrobiology, Jina U.,GUANGDONG, China3 First institute of SOA, QINGDAO, ChinaTo understand the harmful effects oflarge-scale HABs in the East ChinaSea, a series of experiments andfield investigations have beencarried out since 2002. Laboratoryexperiments were conducted on theeffect of HAB causative species,Prorocentrum donghaiense andAlexandrium catenella on thesurvival, feeding and reproduction ofdifferent organisms: juvenile perch,mysids, copepods, eggs and larvaeof scallop, rotifer, Moina mongolicaand Artemia salina. It was foundthat A. catenella at the bloomdensity of 10 5 cells/mL had anadverse impact on all aboveorganisms. Prorocentrumdonghaiense at lower density couldbe utilized as food by smallzooplankton species, but inhibit theirreproduction at the bloom density of10 7 cells/mL. In situ experimentsshowed that survival of the copepodCalanus sinicus was inhibitedsignificantly by HAB seawater.Prorocentrum donghaienseinfluenced the protozoa communitywhen added at the bloom density;PSP was detected giving a toxicityof 4.3 MU/L during Alexandriumbloom. However, few toxic shellfishsamples were detected near theHAB area islands; severalsimulating food chains have beenset up and the results showed thatPSP from Alexandrium speciescould be transferred to fish andlobster.PO.06-27Were nutrients a driving causefor the formation anddisappearance of a Scrippsiellatrochoidea red tide in a marinebay of Hong KongSession: PO.06 – Population dynamicsKedong Yin 1,2 , Xiu-Xian Song 3 , ShengLiu 2 , Kun Jinjun 2 , Pei-Yuan Qian 21 Key Laboratory of Tropical MarineEnvironmental Dynamics, South ChinaSea Institute of Oceanology, ChineseAcademy of Sciences, GUANGZHOU,China,2 Atmospheric, Marine and CoastalEnvironment Program/BiologyDepartment, Hong Kong University ofScience and Technology, HONG KONGSAR, China3 Key Laboratory of Marine Ecology andEnvironmental Sciences, Institute ofOceanology, QINGDAO, ChinaA semi-enclosed bay in Hong Kongis one of hot spots for red tides(high biomass blooms). However,concentrations of ambient nutrientsare not high enough to supportsuch high biomass. When a redtide of Scrippsiella trochoidea307
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006occurred in the bay, weinvestigated the field conditions ofthe red tide and conducted nutrientaddition experiments on watersamples from the red tide and nonred-tidewaters to examine whetherthe red tide would be sustainedwith and without added nutrients orwould collapse rapidly in bottles.Chl a was high in the red tidepatch, but nutrients (NO 3 , PO 4 ,SiO 4 , and NH 4 ) were all low in thenon-red-tide waters, suggestingthat nutrients are not a directdriving cause for the formation ofthis high biomass red tide. Duringthe incubation, phytoplanktonbiomass gradually decreased over9 days in the red tide watersamples without nutrient additionsand without N additions andsteadily increased with N additionsuntil day 7. In the non-red-tidesamples, additions of all NO 3 , PO 4 ,and SiO 4 did not produce high S.trochoidea biomass, indicating thatfactors other than nutrientspromoted the red tide formation ofthis species.PO.14-14Control of cell growth ofcyanobacterial cells using extractfrom water grasses and leaves ofevergreen treesSession: PO.14 - MitigationHiroshi Yoshida, Yukie Hatta, ShinTakano, Ayaka Ishiguro, Asami Touno,Hitoshi OgawaUniv. Tamagawa, MACHIDA-SHI TOKYO,JapanGrowth inhibitors againstcyanobacteria were identified inextractions from various plants,andapplied to small surfaces of watersuch as drinking water reservoirsand recreational lakes. It is wellknown that cyanobacterial bloomsdo not form in some eutrophicponds. In these cases, leaves oftrees around the ponds fall into theponds, or some macrophytes growin the ponds. As a possibility, wethought that water-extractablecompounds from the macrophytesand /or the leaves affect the cellgrowth of cyanobacteria.In order to examine the cell growthinhibitory activity of waterextractable compounds from themacrophytes and the leaves,various plants were collected andextracted with water. We foundseveral inhibitory activecompounds from wood, flowerpetals and young leaves. Thecompounds were isolated andpurified from the extracts foridentification of chemical structurePO.16-04Overwintering of Heterocapsacircularisquama (Dinophyceae)as a pellicle cyst induced by lowtemperature in the laboratorySession: PO.16 – Life cyclesTakahiI Yoshida, Yuya Takahashi,Kanae Ishikawa, Ming-Key Wang,Shingo HiroishiFukui Prefectural University, OBAMA,JapanRed tide blooms of Heterocapsacircularisquama Horiguchi causemass mortality of bivalves andpresent a serious problem forshellfish aquaculture in westernJapan. Sexual reproduction has notbeen found in H. circularisquama,and the mechanism of overwinteringof the populations blooming inJapanese waters is unclear.Dinoflagellate temporary cysts arenon-motile and formed fromvegetative cells by shedding of thetheca (pellicle cyst). We proposethat the pellicle cyst of H.308
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12th International Conference on Harmful Algae

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