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Algae > Volume 8(1); 1993 > Article
Algae 1993;8(1): 7-13.
Distribution and Toxin Profiles of Alexandrium tamarense(Lebour) Balach (Dinoflagellate) in the Southeastern Coastal Waters, Korea
Myung-Soo Han, Joong-Kyun Jeon, Yang-Ho Yoon
Department of Biology, Hanyang University, Korea Ocean Research & Development Institute, Dept. of Oceanography, Yosu National Fisheries
The sediment of Alexandrium tamarense in the southern coastal waters of Korea was studies during the period from May 1989 to June 1990. Toxicities composition in batch cultured A. tamarense originating in Gamraepo were analyzed by bioassays and HPLC, respectively. Alexandrium tamarense was found in Gamraepo. Masan Bay. Chilchundo waters and Yosuhae Bay during the spring season in 1989 and 1990. Biomass of A. tamarense was occurred abundantly (maximum density:5 × 10 super(5)cell/s) in Gamraepo but it was rare(below 4.3 × 10 super(3)) in the other areas. The growth rate of A. tamarense exhibited 0.2day super(-1) during the culture period, however, the growth rate in the early exponential phase was high (0.82 day-1). Variation of toxicity was seen as an enhancement in toxin content superimposed on the growth stage variability. Toxin composition in batch culture revealed neosaxitoxin(neoSTX: 21.2-42.9 mole%) and gonyautoxin 8 (Cl: 29.0-40.3 mole%) as the major component, along with gonyautoxin 2(GTX2:2.0-9.1), epi-gonyautoxin-8(C2:6.2-8.2) were revealed as the minor component, and saxitoxin (STX), gonyautoxin 3-5(GTX3-5), decarbamoylgonyautoxin-2(dcGTX2)and decarbamoylgonyautoxin-3 (dcGTX3)were revealed in trace. Variability in the toxicity of A. tamarense was observed under different algal growth stages, and there were no distinct differences in toxin composition.
Key words: Alexandrium tamarense, toxin profiles, distribution, Korea

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