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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 consideri ng typical flow pattern around some boulders in upstream river. The relative depths (ratio of water d pth to boulder height, H/hb) are 2.25 and 1.1 for S and J, respectively. Invertebrate samplings were co nducted at the two type habitat and at control. Significant differences have been found not only by velocity profile but also by resilience of inverte brate according to the different H/hb. In the colonization processes, each tolerance typ for disturbance of invertebrate showed different colonization patterns according to the hydraulic characteristics of each experimental microhabitat.

MICROHABITAT CHARCTERISTICS BEHIND LARGE BED MATERIAL AND ACROINVERTEBRATE DYNAMICS - SEPARATION AND HYDRAULIC JUMP TYPE HABITAT-