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at the bottom of shallow area of the artificial tidal flat where ground levels were from D.L.-2.3 to D.L.-1.9m. Photosynthesis of phytoplankton and seaweed played an important role on the dynamics of oxygen at the artificial tidal flat. Release of oxygen by phytoplankton changed depending on photon flux density, while dominant seaweed, Ulva sp. showed active photosynthesis in spite of low photon flux density. Oxygen consumption by respiration of Ulva sp. promoted hypoxia at night at the grounddoi:10.2208/proce1989.54.1261 fatcat:cakkqu6iazfn3jnd5hyh6bdube