Abstract
Flow fluctuation is an important factor determining the characteristic of the stream ecosystem. In this study, we investigated stream fish, invertebrates and their habitat characteristics before and after a spate, in order to reveal the dynamics of lotic animal community in intermittent reach. Fish and invertebrates were observed after rewetting by the spate in the intermittent reach, Fish community established within the intermittent reach were suggested to have colonized from the downstream perennial reach. However, both fish and invertebrates are finally killed by drying up with the decreasing flow in the intermittent reach. We concluded that flow fluctuation induced drastic temporal change in stream animal assemblages.
