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Abstract

A tidal flat is an important place for sea environments. In recent years , creation of an artificial tidal flat has increased to restore the lost natural environments by developments in the past. We investigated the environmental characteristics of the artificial lagoon tidal flat in "Wild-Bird-Watching-Park in Tokyo Port" , and compared the characteristics with other tidal flats in Tokyo Bay. Then we measured the water quality in the channels between tidal flats and Tokyo Bay for two tidal cycles at every one or two hours. Form the study, we found that the value of ignition loss is high and benthic polychaeta are dominant species of the tidal flats. And then , we found the nutrientfl uxes of NH4-N and PO4-P pass through the channels were flow out from the tidal flat to Tokyo Bay. We thought that quantity of primary production was low in the artificial tidal flat in Tokyo Port .