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Tokyo Port Wild Bird Park, which was originally a part of the reclaimed industrial area, was constructed in 1989 by the request of the local citizens. Since then, the seaside park that includes an artificial lagoon has provided precious opportunities of natural experience for the people in urbanized Tokyo-Bay Area.For the maintenance and management of the park, volunteer citizens groups have played a crucial role. Since the opening of the park, the highly motivated volunteer groups, in cooperation with members of Wild Bird Society of Japan, have continuously monitored the topographical change of the artificial lagoon and the situation of birds, benthos, and vegetation. In addition, the volunteer groups carriedout some field experiments. For example, they constructed an artificial creek and monitored the growth of thereed around it. They also constructed bamboo fences to check their anti-erosion effect at the shoreline and seabed. These continuous activities help to build better understanding of the environmental management in an artificial lagoon. The authors suggest the need of the involvement of more persons with biological knowledge, in addition to the volunteer group, in order to enhance the quality of the management method.