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Sparganium erectum, mikuri in Japanese, is an endangered species in local areas. Characteristics of annual growth pattern was observed in a small stream separately between above- and belowground biomass, and new and old shoots. Succeeding upward and downward material translocation was recognized from between above- and below ground biomass from spring to summer, and at the time of new shoot formation in autumn. The new shoots hibernate under water then grow rapidly in spring. Therefore, warm temperature in winter is particularly important for this species. Many shoots collapse in August, then stuck the current in the community. The velocity extremely reduces inside the community because of the collapse of shoots, then an amount of silt is accumulated in a short time on the bottom. As the species has the strong tolerance in the anoxic sediments, it is presumably one of strategies to develop a community by accumulating silt inside the community.

ANNUAL GROWTH PATTERN OF SPARGANIUM ERECTUM AND ITS EFFECTS ON THE STREAM CURRENT AND SUBSTRATE MATERIALS