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 2006induced ecological restoration),which made it possible to solve allthese problems. In the study of theMLS technique, it was found thatsome natural netting and bridgingmaterials, such as chitosan, turnedmany solids, such as localsoils/sediments, into highly effectiveflocculants in removingcyanobacterial blooms fromn freshwaters (1-3). When MLS was furthermodified with macrophyte seeds(MLSIER), the short-term effect ofalgal removal triggered a long-termmacrophyte growth (the latter wouldotherwise die in HAB waters), whichpermanently fixed the cells andnutrients into the sediments.1. Pan G, Zhang MM et al.,Environmental Pollution, 2006, 141(2): 195.2. Zou H, Pan G et al.,Environmental Pollution, 2006, 141(2): 201.3. Pan G, Zou H et al.,Environmental Pollution, 2006, 141(2): 206.PO.10-18Trying to cultivate Dinophysisacuminata, a dinoflagellatecausing diarrhetic shellfishpoisoningSession: PO.10 - Ecophysiology &autecologyMG Park 1 , S Kim 2 , HS Kim 3 , YG Kang 2 ,W Yih 21 Chonnam National University, GWANGJU,South Korea2 Kunsan National University, KUNSAN,South Korea3 Gunsan RMAFO, MOMAF, KUNSAN,South KoreaThe dinoflagellate genus Dinophysisincludes several toxic species whichcause diarrhetic shellfish poisoning,and no species of the genus has yetbeen established in culture. Whilethe plastids in Dinophysis areknown to be of cryptophyte orhaptophyte origin, whether they arekleptoplasts and how they areacquired by Dinophysis still remainunresolved. To address theseissues, we tried to establish D.acuminata in laboratory culture. Theresults will be discussed in contextof biology and plastid evolution ofDinophysis species.PO.12-08Morphological characteristicsand life cycle of the diatomThalassiosira cf stellarisSession: PO.12 - Taxonomy and phylogenyJG Park, J RenKunsan Univ., JEOLLABUK-DO, SouthKoreaStrains of Thalassiosira stellaris andThalassiosira cf stellaris wereisolated off the coast of Wando,Korea. T. cf stellaris resembles T.stellaris in many morphologicalcharacteristics such as cell length,fascicular distribution of areolae,and the number and interval ofstrutted processes on the marginand middle of the valve face. T. cfstellaris differs in lacking dot-shapedsmall processes on the valve face,and the strutted processes aresurrounded by four additional smallareolae. T. cf stellaris displayedtypical oogamous reproduction. In aphase of vegetative multiplication,several cells were connected bymucous threads to build up shortchains in which each cell standsapart at regular intervals, but duringand/or just before sexualreproduction, the cells were closelyconnected to neighbouring cellsproducing chains withoutmucilaginous threads. Cell counts ofsingle cells decreased with growthof the filamentous chains. These257