慶安川水系에 있어서 水樣昆蟲에 의한 生物學的 水質評價

A Study on the Biological Estimation of Water Pollution Levels by the Aquatic Insects in Kyuñgan Strean ， Kyunggi-Do

The present study was accomplished from March to August. 1990 in order to examine the commun. ity structure of aquatic insects and the biological estimation of water pollution levels by the aquatic inseets of Kyungan stream in Kyunggi do 1. The aquatic inseets of whole area composed of 78 species. 42 genera, 26 families in 8 roders 2. The occurrence species number show highest at Gungpyung ri(29 species) and lowest at Yongin town(l species) 3. Dominance indices show lowest at Gungpyung ri(O.35) and highest at Yongin town( l.OO) and Choboo ri(1.00) 4. Spec:ies diversity indices show highest at Gungpyung ri(3.53) and lowest at Yongin town(O.OO) 5. The biological estimation of each area’s water quality levels based on the diversity index are as follows. Oligosaprobic area Gungpyung rí. Muchu ri a mesosaprobíc area Yooeun rí. Choboo ri(K4), upper site of Wangsanri‘ Yeuk ri. Wangsan.ri. β mesosaprobic area Gonjiam ri , Dopyoung ri , Kyungan ri , Wondang.ri. Polysaprobíc area Yongin town‘ Choboo ri(K5 )