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The chironomid midges emerged during the winter season were investigated by light and emer:gence traps at the middle reaches of the Kiso River from November 1988 to March 1989. Fourteen genera and 19 species were identified. The most dominant species, Hydrobaenus kondoi Saether 1989, was especially abundant in midwinter. introduction The southern part of the Kiso River, located in central Japan, flows along the borders of Aichi and Gifu Prefectures. Every winter since 1986, chironomid midge outbreaks have eccurred along the left bank at a distance of 27 to 34 km from the mouth of the river, This phenornenon was recently studied and the ensuing results revealed that the midge outbreaks have been caused by the high populatien density of Hydrobaenus kondoi during the winter season (Kondo, 1991). However, except for the nuisance midge, H. kondoi, little is known about the species composition and prevalence of the 1994) * ureeXts: NfuKflj(\#tsut\#$ (+480-11 ptfuMstivptftbk4MlZttincX 2r) ** klt \: 'M-Nee*\ (+930-12 MI"zaLge J[1 as± ut MTMre tt 65-1) 285 chironomid midges at the surveyed area during the winter season. In order to determine the species composition and abundance of the chironomid population during the winter season, investigation by light and emergence traps was carried out during the period from November 1988 to March 1989. Study area and methods The chironomid midges were collected at the middle reaches of the Kiso River in Bisai City, Aichi Prefecture. The sampling area looks like a man-made lake because of the construction of a large dam located 27km upstream from the mouth of the river. The width is 500-700m, and the mean depth is about 1.0 m. The water of・ the area is very clear and has a high eoncentration of dissolved oxygen (9.5-11.4 mglliter) during the investigation period. The water current is very slow (O.07-O.10m!sec). The temperature ranged from min. 3.5eC to max. 13.20C in the water and from min. 4.00C to max. 15.5eC in the air during the investigation period. The river bed near the left bank consists mostly of mediumand fine-grain sand. Chironomid midges were collected monthly by one light trap (6W black fluorescent lamp) during the period from November 1988 to March 1989 and by four ernergence traps (5e cm × 50 cm) in December 1988 and February 1989. The light trap was set, near the left bank at a point 30 km frorn the mouth of the river, and lighting was continued overnight. The four emergence traps were set on the shore line located about 30 km from the mouth of the river. The midges were collected 2

Chironomidae (Diptera) during the winter season at the middle reaches of the Kiso River