Abstract
Tidal variability of biochemical composition (carbon and nitrogen stable isotopic ratios) and phytopigment content of suspended particulate matter (SPM) in the bottom water were investigated in Banzu Intertidal Sand Flat, Tokyo Bay, Japan and food environment with diet of manila clam, Ruditapes philhppinarum were discussed. Biochemical composition of SPM showed large tidal variations and it was suggested that high tide periods were suitable food environment for clam. The results also indicated that phytoplankton which transported from offshore around high tide is important food source for clam. In addition, results of stable isotope analyses suggest that clam selectivelyintake SPM during high tide periods and assimilate selected components among those SPM.
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