조양강·동강의 저서무척추동물군집 특성

Abstract

Quantitative and qualitative sampling of the benthic macroinvertebrates was conducted in September and October, 1998 and in April and July, 1999. The study area included 8 sites in main course of the Choyang and Dong River and at 7 sites in its tributaries. Benthic macroinvertebrates species observed in this area composed of 144 species, 49 families, 15 orders and 7 classes in 4 phyla. Aquatic insects consisted of 40 species of ephemeroptera, 33 species of trichoptera, 26 species of diptera, 15 species of plecoptera, 11 species of coleoptera, 3 species of odonata, 2 species of hemiptera and 2 species of megaloptera. Other benthic macroinvertebrates were comprised of 5 species of mollusca, 4 species of annelida, 2 species of platyhelminthes and 1 species of crustacea. Plecoptera, ephemeloptera, and trichoptera, which are indicator species of clean water, were abundant in the mountain stream. The mean values of species diversity index were in the very high range (3.20-3.48), indicating that community structure of macroinvertebrates in this area is stable.