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The warm-water red tide flagellates Chattonella marina (Raphidophyceae) and Cochlodinium polykrikoides (Dinophyceae) were observed for the first time on the west coast of Hokkaido in summer 2014 by daily monitoring of the surface seawater. The two species sporadically appeared in the warm condition (>20 °C) during a period when the Tsushima Warm Current predominated off Hokkaido from July to September...
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