Abstract
The regional distribution of dinoflagellates was investigated in the surface waters surrounding Hokkaido in May, August, and October, 1983. Among the total of 92 species identified, 37 species appeared throughout the investigation period. A similarity analysis identified six assemblages at Cλ=0.66. It was shown that each assemblage was closely related to the currents and the water temperature. Assemblage I consisted of 80% of the total samples and was subdivided into two groups-cold and warm water species in the Tsushima Current. Cold water species were widely spread in the Tsushima and Soya Currents in May and shifted to the Low Saline Water in October while warm water species were dominant in the Tsushima and Soya Currents in October. The regional abundance of shellfish toxic dinoflagellates,Dinophysis fortii andProtogonyaulax tamarensis, was also revealed.
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