A Mechanism of Red Tide Formation. I. Growth Rate Estimate by DCMU-Induced Flourescence Increase

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Abstract
Growth experiments with unialgal cultures of red tide flagellates, Prorocentrum triestinum and Olisthodiscus luteus, showed that relative growth rates of phytoplankton can be estimated from DCMU[3-(3,4-dichlorophenyl)-1,1-dimethyl urea]-induced fluorescence increase (DCMU-FI). This method was applied to the estimation of relative growth rate of a natural population in Tanigawa Harbor (Japan), where O. luteus was dominant throughout the experiment. Measurements were made 3 times a day over a wk. A steady increase of photosynthetic capacity indicated by DCMU-FI was followed by a red tide of O. luteus. Such increase of photosynthetic capacity was associated with accumulation of ammonia, and low dissolved O2 levels in the water column near the bottom.

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