Headwater streams provide various microhabitats, resulting in high diversity of macroinvertebrate community. In this study, we compared the differences of communities between two adjacent headwater streams (Jangjeon stream (GRJ; GRJ1-GRJ5) and Haanmi stream (GRH; GRH1-GRH3)) in Jungwang and Gariwang mountains, Gangwon-do and evaluated the effects of habitat condition to the macroinvertebrates community composition. In order to characterize the macroinvertebrate communities and extract influential environmental factors, we applied to Cluster analysis (CA), Indicator species analysis and Non-metric multidimensional scaling (NMDS). Total 33,613 individuals in 3 phyla, 5 classes, 13 orders, 51 families, and 114 taxa (genera or species) were collected. Gammarus sp. was dominant at the upper stream of GRJ, whereas Chironomidae spp. was abundant at GRH and the downstream of GRJ. The CA classified samples into six clusters (1-6) reflecting spatial and temporal variation of benthic macroinvertebrate communities. Benthic macroinvertebrate community composition was significantly different between two adjacent streams. Sweltsa sp. 1, Psilotreta kisoensis, Rhyacophila shikotsuensis and Serratella setigera were identified as representative indicator species for clusters 1, 2, 3 and 5, respectively. Similar to CA results, NMDS revealed the spatial and temporal differences of benthic macroinvertebrate communities, indicating the difference of community composition as well as microhabitat condition. Forest composition, proportion of boulders (>256 mm), and water velocity were main factors affecting the macroinvertebrate community composition.

Abstract
 서 론
 재료 및 방 법
  1. 조사 지역
  2. 조사 방법
  3. 군집 분석
 결 과
  1. 서식지 환경 특성
  2. 저서성 대형무척추동물 군집 특성
  3. 시공간적 차이에 따른 군집 구성 변화
  4. 군집 구성과 서식지 환경의 관계
 고 찰
 결 론
 REFERENCES

• 이다영(경희대학교 생물학과) | Lee Da-Yeong (Department of Biology, Kyung Hee University)
• 배미정(국립낙동강생물자원관 담수생물다양성연구실) | Mi-Jung Bae (Freshwater Biodiversity Research Division, Nakdonggang National Institute of Biological Resources)
• 권용수(국립생태원 생태평가연구실) | Yong- Su Kwon (Division of Ecological Assessment, National Institute of Ecology)
• 박찬우(국립산림과학원 기후변화생태연구과) | Chan-Woo Park (Forest Ecology and Climate Change Division, National Institute of Forest Science)
• 양희문(국립산림과학원 기후변화생태연구과) | Hee Moon Yang (Forest Ecology and Climate Change Division, National Institute of Forest Science)
• 신유진(국립산림과학원 기후변화생태연구과) | Yujin Shin (Forest Ecology and Climate Change Division, National Institute of Forest Science)
• 권태성(국립산림과학원 산림병해충연구과) | Tae-Sung Kwon (Forest Insect Pests and Diseases Division, National Institute of Forest Science)
• 박영석(경희대학교 생물학과, 경희대학교 나노의약생명과학과) | Young-Seuk Park (Department of Life and Nanopharmaceutical Sciences, Kyung Hee University) Corresponding author