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To evaluate the variations in the toxin profiles of Alexandrium tamarense (Dinophyceae) from Hokkaido and southern Sakhalin, paralytic shellfish poison of 103 culture strains obtained from six areas (Funka Bay, Toma- komai, Urakawa, Akkeshi, Okhotsk Sea and Aniva Bay) was analyzed using high performance liquid chromatography- fluorescent detection. All of the strains, except for two culture strains, were classified by a hierarchical cluster analysis into clusters in which the strains had almost the same toxin composition as found in previous studies (major toxins: C2, gonyautoxin 4, neosaxitoxin and gonyautoxin 3). On the other hand, cellular toxin contents of the culture strains varied from 1 to 1,128 fmol cell  1 and the cellular toxin content (y fmol cell  1 ) was inversely proportional to the cell density (x cells mL  1 ) (y 9942.2x  0.448 , Spearman's rank correlation coefficient: rs 0.539, p 0.01). It can be con- cluded that the toxin compositions of A. tamarense are almost the same in Hokkaido and southern Sakhalin, and high- toxicity blooms of A. tamarense as usually found possibly occur in the natural environment at low cell densities (10  2 -10 2 cells mL  1 ).

Toxin profile of Alexandrium tamarense (Dinophyceae) from Hokkaido, northern Japan and southern Sakhalin, eastern Russia