抄録
The target of this study is to quantify the amount of nitrogen and phosphorus removed from enclosed eutrophic water through the food web participated by filter-feeding bivalves, aquatic birds, and macrophytes. In an estuarine lagoon, Lake Nakaumi, dredge of the sludge removed 13 tons nitrogen and 6.7 tons phosphorus per year. On the other hand, present amount of nitrogen and phosphorus removed through food web is estimated to be 9.1 tons and 2.9 tons, respectively. It is suggested that the potential amount of nitrogen and phosphorus removed through food web in L. Nakaumi is 35 tons and 8.6 tons, respectively.
