Abstract
Species composition and feeding habits of crustacean plankters were studied in the pools of high moors located in Hokkaido, Fukushima, Niigata, Nagano and Gunma Prefecture in summer from 1983 to 1987. Acanthodiaptomus pacificus was dominant in the clear water pools, and its alimentary canal was filled with bluegreen algae, Merismopedia spp., which formed epipelon community on the surface of the bottom deposit. Daphnia longispina, Ceriodaphnia quadrangula and Diaphanosoma brachyurum were dominant in the semi brown and brown water pools, and their alimentary canals were filled with humic detritus suspended mainly in the pool water. The difference in dominant species among the pools investigated was discussed from the viewpoint of their feeding habits.
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