Benthic macroinvertebrates are important ecological and environmental indicators as primary or secondary consumers, and therefore are widely used in the evaluation of aquatic environments. However, there are no comprehensive river ecosystem monitoring surveys that link the major physicochemical water quality items with benthic macroinvertebrates in urban streams. Therefore, this study investigated the distribution characteristics of benthic macroinvertebrates and physicochemical water quality items (17 items) in Yangjaecheon and Yeouicheon from 2019 to 2020. At the same time, by applying Spearman’s rank correlation analysis and nonmetric multidimensional scaling (nMDS) analysis in the water quality data and biotic index, we tried to provide basic data for diagnosing the current status of river ecosystems in major urban rivers in Seoul. Based on the study results, a total of 39 species and 3,787 individuals were identified in Yangjaecheon, the water quality (based on BOD, TOC, and TP) of Yangjaecheon was higher than Grade Ib (good), and the BMI using benthic macroinvertebrates appeared as Grade C (normal) at all the sites. In Yeouicheon, a total of 51 species and 4,199 individuals were identified, the water quality (based on BOD, TOC, TP) was higher than Grade Ib (good) similar to Yangjaecheon, and the BMI of both Upstream and Saewon bridge was Grade B (good), while Yeoui bridge was Grade C (normal). Overall, analysis results for the distribution of benthic macroinvertebrates by a nonmetric multidimensional scaling method showed no significant difference between the two streams (p=0.1491). Also, significant environmental variables related to benthic macroinvertebrates distribution were determined as water temperature and DO. On the other hand, the results of the correlation analysis between biotic index and major water quality items confirmed that R1 and BMI could be used for on-site urban river water quality evaluation.

Abstract
서 론
재료 및 방법
    1. 자료수집
    2. 조사방법
결과 및 고찰
    1. 수질환경 특성
    2. 저서동물 분포특징
    3. 군집지수
    4. 하천 환경상태 평가
    5. 통계적 분석 결과
결 론
적 요
REFERENCES

• 이진효(서울특별시보건환경연구원 물환경연구부) | Jin Hyo Lee (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health, Gwacheon 13813, Republic of Korea) Corresponding author
• 한현(서울특별시보건환경연구원 물환경연구부) | Hyeon Han (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health, Gwacheon 13813, Republic of Korea)
• 이준연(서울특별시보건환경연구원 물환경연구부) | Jun Yeon Lee (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health, Gwacheon 13813, Republic of Korea)
• 차영섭(서울특별시보건환경연구원 물환경연구부) | Young Seop Cha (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health, Gwacheon 13813, Republic of Korea)
• 조석주(서울특별시보건환경연구원 물환경연구부) | Seog Ju Cho (Water Environment Research Department, Seoul Metropolitan Government Research Institute of Public Health, Gwacheon 13813, Republic of Korea)