We collected fishes at the 12,873 sites in stream order (1~7) from 2008 to 2016. In the results, two populations (Zacco platypus and Zacco koreanus) represented distributional differences in the stream order gradient, and correlation analysis showed that the two populations had a potential competitive relationship. The ecological characteristics of the fish except for the Z. platypus and the Z. koreanus, according to the gradient of stream order showed a pronounced gradient in the species such as intermediate species, sensitive species, carnivores, herbivores and omnivores. The two populations showed a high correlation between intermediate species, sensitive species of the tolerance guild and omnivores, insectivores of the trophic guild. Fish assessment index (FAI) was negative relation with stream order. According to the stream order gradient, the two populations showed different correlations with FAI.

서 론
 재료 및 방 법
  1. 조사지점 및 어류 조사
  2. 생태지표 특성 분석
 결 과
 고 찰
 적 요
 사 사
 REFERENCES

• 이승현(국립환경과학원 유역생태연구팀, Watershed Ecology Research Team, National Institute of Environmental Research) | Lee, Seung-Hyun
• 정현기(국립환경과학원 유역생태연구팀, Watershed Ecology Research Team, National Institute of Environmental Research) | Hyun-Gi Jeong
• 신현선(농촌진흥청 연구정책국 기후변화팀, Climate Change Team, R&D Coordination Division, Rural Development of Administration) | Hyun-Seon Shin
• 신유나(국립환경과학원 유역생태연구팀, Watershed Ecology Research Team, National Institute of Environmental Research) | Yuna Shin
• 이수웅(국립환경과학원 유역생태연구팀, Watershed Ecology Research Team, National Institute of Environmental Research) | Su-Woong Lee Corresponding author
• 이재관(국립환경과학원 물환경연구부, Water Environment Research Department, National Institute of Environmental Research) | Jae-Kwan Lee