Biological assessments of streams have been developed in many countries to evaluate ecological integrity. A multimetric index is one of the primary methods used for this purpose, incorporating chemical, physical, and biological variables of the environment. In Korea, the Benthic Macroinvertebrates Index (BMI) is currently applied in national biological monitoring programs; however, BMI reflects only organic pollution and does not account for other environmental variables in streams. This study aimed to develop a new multimetric index, the Benthic Macroinvertebrate-based Multimetric Index (BMMI), for assessing the ecological integrity of Korean streams. We analyzed data from 3,307 sites, including water quality information. Reference and disturbed streams were identified based on PC 1 scores with 7 environmental factors (Axis 1 of the PCA), genus levelbased taxa richness, and BMGI values used for trimming. From an initial set of 82 candidate metrics, six (genus level-based taxa richness, Shannon’s diversity index, percent of taxa in E.P.T., percent of individuals in collectorsgatherers, percent of individuals in clingers, BMGI based on saprobity) were selected through statistical analyses, including coefficient of variation and discriminant analysis. BMMI successfully distinguished between reference and disturbed streams and showed significant correlations with various environmental factors. These results indicate that BMMI is suitable for evaluating the ecological integrity of streams in Korea. Therefore, it is recommended that stream ecosystem assessments transition from BMI to BMMI in the future to provide a more comprehensive evaluation of stream integrity.

Abstract
서 론
재료 및 방 법
    1. 자료수집
    2. 참조·교란하천 구분
    3. 핵심 평가요소 선정
    4. 지수화
결과 및 고 찰
    1. 참조하천과 교란하천 선정
    2. 핵심 평가요소 선정
    3. 저서성 대형무척추동물 다중계량지수 등급화
    4. 활용성 검토
결 론
적 요
REFERENCES

• 공동수(경기대학교 생명과학과) | Dongsoo Kong (Department of Life Science, Kyonggi University, Suwon 16227, Republic of Korea) Corresponding author
• 박근용(경기대학교 생명과학과) | Geun Yong Park (Department of Life Science, Kyonggi University, Suwon 16227, Republic of Korea)
• 김아름(경기대학교 생명과학과) | Ah Reum Kim (Department of Life Science, Kyonggi University, Suwon 16227, Republic of Korea)
• 이효주(넥서스환경디자인연구원 주식회사 생태공학연구소) | Hyoju Lee (Ecological Engineering Ins., NEXUS Ecological Solution Group, Uiwang 16006, Republic of Korea)
• 전영철(주식회사 생태자원연구소) | Yung Chul Jun (Institute for Ecological Resource, Seoul 02783, Republic of Korea)
• 유경아(국립환경과학원 물환경연구부 수자원연구과) | Kyung-A You (Water Resources Research Division, Water Environmental Research Department, National Institute of Environmental Research, Incheon 22689, Republic of Korea)
• 이경락(국립환경과학원 물환경연구부 수자원연구과) | Kyung-Lak Lee (Water Resources Research Division, Water Environmental Research Department, National Institute of Environmental Research, Incheon 22689, Republic of Korea)