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 2006high frequent periods in 1990-1991,1998 and 2002; the seasonal andannual variation, and the causativealgal species of HAB were alldifferent among the 4 regions. ManyHABs occurred in the northernregion, and two high frequent areaswere off the Pearl River and theManila Bay. Relatively, HABsoccurred frequently during March-May in the northern region and inJuly in the western region. Ascausative species Noctilucascintillans dominated in the northernregion, and Pyrodinium bahamensein both eastern and southernregions. Pyrodinium bahamenseand Noctiluca scintillans were thedominating species during 1980-2003, but more Phaeocystis cfglobosa and Alexandrium spblooms occurred 1991-2003. Thosevariations are related to regionalocean environments, such asreversed monsoon winds, riverdischarges, and upwelling, and alsoaffected by local conditions, such aseutrophication off the Peal Riverand in the Manila Bay.PO.13-42Dynamics of harmful algalblooms in the Ukrainian coastalBlack SeaSession: PO.13 - Regional eventsLudmila Terenko, Galyna TerenkoOdessa Branch of the Institute of Biology,ODESSA, UkraineDuring the last 10 years (1995–2005), 62 cases of microalgalblooms have been mentioned in theUkrainian coastal Black Sea.Basic main features of microalgalblooms in the Ukrainian Black Seaare:– The number of microalgal speciesthat produce blooms has increased(in the 1960s – 14, in 70-80s – 24,and in the 90s – 37 species);– Blooms of Skeletonema costatumare frequent (15 cases) at allseasons, which indicate high levelsof eutrophication. Maximal densitiesregistered were 50 10 6 cells l -1 ;– Within the last years, there hasbeen a simultaneous dominance of2-4 species of microalgae (S.costatum, Heterocapsa triquetraand Eutreptia lanowii);– There has been a development ofblooms caused by Chrysophyceae(Emiliania huxleyi, Apedinellaspinifera) and Euglenophyceae(Eutreptia lanowii, E. viridis);– Dinoflagellate species that did notcause blooms earlier (Gymnodiniumsimplex, Gyrodinium instriatum,Scrippsiella trochoidea) startedoccurring in this region;– The density of the invasive toxicspecies Cochlodinium polykrikoidesincreased from 0,7-10 3 cells l -1 in2001 up to 0,16-10 6 cells l -1 in 2005;– Potentially toxic diatoms (Pseudonitzschiaseriata, P. delicatissima)and dinoflagellates (Gymnodiniumaureolum, C. polykrikoides,Alexandrium pseudogonyaulax, A.tamarense) are frequentlydominant.The analysis of long-term changesof blooms in the Ukrainian BlackSea has shown an increase innumber of episodes from the end ofthe 90s.PO.12-16Does Gambierdiscus toxicus typematerial exist?Session: PO.12 - Taxonomy and phylogenyPA Tester 1 , MA Faust 2 , MWVandersea 1 , SR Kibler 1 , M Chinain 3 ,MJ Holmes 4 , WC Holland 1 , RW Litaker 11 National Ocean Service, NOAA,BEAUFORT, NC, United States of America2 Smithsonian Institution, WASHINGTONDC, MD, United States of America290