Monitoring of Benthic Macroinvertebrate Community Structure and Evaluation of Water Conditions for Lake Chung-Pyoung in the Han River Water System

Abstract

A series of ecological monitoring surveys was conducted to examine the characteristics of benthic macroinvertebrate community and evaluate the water conditions for lake Chung-Pyoung from August 2008 to April 2009. The benthic macroinvertebrate taxa represented total 84 species belonging to 52 families, 18 orders, 7 classes, 4 phyla from the qualitative and quantitative sampling. Among these, a total of 67 aquatic insect species(about 82%) were comprised of the major groups in all communities. The relative abundance of Ephemeroptera, Trichoptera, Odonata and Mollusca was 20%, 16%, 16% and 13%, respectively. According to the results, Chironomids were major dominant taxa. The primary dominant species was Chironomidae sp.1(92.18 23.28%) followed by Chironomidae sp.6 (65.52 46.69%), Parafossarulus manchouricus(61.29%), Limnodrilus gotoi(47.83%), Ecdyonurus levis(47.27%), Tanypodinae sp.(45.51%). The average values of dominant index(DI), diversity index(H'), evenness index(J'), and species richness index(R1) were 0.78(±0.13), 1.63(±0.62), 0.64 (±0.20), and 1.35(±0.52), respectively. The water quality of all the sites was oligosaprobic in average.