Few reports of benthic macroinvertebrates in Lake Shibire (Japan) have been documented since Kuriya-gawa Aso (1979), but recently Hirabayashi Yoshizawa (1993) reported the horizontal distribution of benthic macroinvertebrates and found that oligochaetes, chaoborids and chironomids accounted for 75.5, 15.5 and 9.0 of total macroinverte-brate density, respectively. According to their report, the most abundant chironomid species were Chirono-mus nipponensis and Propsilocerus akamusi, both common in eutrophic and mesotrophic lakes in Japan. The present study covers seasonal trends over 11 years (1994—2004) in density of benthic macroinvertebrates, especially the two principal chironomid species, in the lake center of Lake Shibire. The study also considered macroinvertebrate density in connection with their predators.
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