赤潮プランクトンの集積機構に関する研究 ＩＩ Ｃｈａｔｔｏｎｅｌｌａ ａｎｔｉｑｕａ（ＨＡＤＡ）ＯＮＯの集積に及ぼす風の影響

Abstract

At the south-west pary of the Harima Nada in the Seto Inland Sea, the acumulation of Chat-tonella antiqua and the occurrence of red tide were not found about lst of August in 1979 which period had a few of days with long time of flood during floating time of the plankton (10:00-16:00), and then the rapidly increased plankton which was foud at the next period with long time of flood suddenly disappeared since 16th of August. In oredr to clarify these causes, the relations between the accumulation of C. antiqua and the environmental factors such as the velocity and direction of tidal current and wind were examined during the floating time of the plankton, by refering some related data. The results suggested that in the case of rather strong wind such as 3-5m/sec, the wind acted multiply wity tidal current on the accumulation of C. antiqua and accelated the occurrence of red tide when the wind direction was sane with one of tidal current, whereas the wind acted with the tidal current to control each other and prevented the occurrence of red tide or accelated the disappearance of it when the wind direction was reverse with tidal current. However, the rather weak wind such as 1-3m/sec could not find so remarkable effect on the accumulation of the plankton.