抄録
Dynamics of invertebrate community in a gravel bed riffle has been investigated in relation to the microhabitat characteristics of boulder wake region. Two types of microhabitat, separation type (S) and hydraulic jump type (J), were constructed considering typical flow pattern around some boulders in upstream river. The relative depths (ratio of water depth to boulder height, H/hb) are 2.25 and 1.1 for S and J, respectively. Invertebrate samplings were conducted at the two type habitat and at control. Significant differences have been found not only by velocity profile but also by resilience of invertebrate according to the different H/hb. In the colonization processes, each tolerance type for disturbance of invertebrate showed different colonization patterns according to the hydraulic characteristics of each experimental microhabitat.
