Abstract
Seasonal changes of seston were monitored in the pearl cultivation area of Uchiumi Bay, Ehime Prefecture, Japan where the pearl oyster Pinctada fucata martensii is cultivated. The concentrations of chlorophyll a and particulate carbon, nitrogen and phosphorus were measured and the community structure of the phytoplankton investigated between June 1997 and February 1999. The seston was divided into pico- ( 20 μm) size fractions. The dominant size fraction during the study period, 2 μm for evaluation of the food environment of the pearl oyster.
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