Abstract
The relationship between the xanthophyll pool [diadinoxanthin plus diatoxanthin normalized to chlorophyll (Chl) a] and irradiance was examined during phytoplankton blooms in Sagami Bay from the end of April to July 2000. In the case of Chl a concentrations >2 mg m -3 , a linear correlation was found between the xanthophyll pool and irradiance of the previous day. On the other hand, for Chl a concentrations <2 mg m -3 , the xanthophyll pool remained low and was independent of irradiance of the previous day. The results may indicate that photoprotection by xanthophyll pigments assists the development of phytoplankton blooms under high-irradiance conditions.
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