Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Application of Echo-Sounder Monitoring Technique as Ecological Impact Assessments of Fish on Artificial Weir Construction

인공보의 어류생태영향 평가를 위한 Echo-sounder 모니터링 기법 적용

  • Han, Jeong-Ho (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University) ;
  • Lee, Jae Hoon (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University) ;
  • Choi, Ji-Woong (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University) ;
  • Lim, Byung Jin (Yeongsan River Environmental Research Center) ;
  • Park, Jong-Hwan (Yeongsan River Environmental Research Center) ;
  • An, Kwang-Guk (Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University)
  • 한정호 (충남대학교 생명시스템과학대학 생물과학과) ;
  • 이재훈 (충남대학교 생명시스템과학대학 생물과학과) ;
  • 최지웅 (충남대학교 생명시스템과학대학 생물과학과) ;
  • 임병진 (국립환경과학원 영산강물환경연구소) ;
  • 박종환 (국립환경과학원 영산강물환경연구소) ;
  • 안광국 (충남대학교 생명시스템과학대학 생물과학과)
  • Received : 2012.08.15
  • Accepted : 2012.10.15
  • Published : 2012.12.31
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Abstract

In this study, Echo-sounder($E_s$) monitoring methodology was applied to test environmental impacts of artificial weirs(SCW and JSW) in the Yeongsan River on fish community and habitat structures at first time, and was compared with conventional fish sampling methodologies($C_s$). For the Es monitoring in the fields, parallel transect methods was employed in determining the survey distance interval with every 125 m within the upper-lower 2 km of the weirs. Four different fish sampling gears such as casting nets, kick nets, fyke nets, and gill nets were used for applications of $C_s$ monitoring methodology. According to the Echo-sounder monitoring, fish density, expressed as a number of individuals per square meter, along the longitudinal axis of the weir was significantly greater(JSW, t = 3.506, n = 30, p < 0.001) in the down-river reach of the weir than in the up-river reach. Also, fish density along the vertical water column was highest at mid-depths of Seungchon weir, which has simple habitat substrates, while fish density was highest at hypolimnetic depth of Juksan weir. According to fish sampling by the $C_s$ methodology, the fish compositions decreased as the river goes upward, and significant differences(JSW, t = 0.248, n = 30, p < 0.05) in the compositions of fish species occurred between up-reach and down-reach of the weirs. The dominant species near the two weirs were Opsarichthys uncirostris amurensis, Hemiculter eigenmanni and Coilia nasus. Overall, our fish and habitat data, based on $E_s$ and $C_s$ monitoring methodologies, suggest that the weirs disturbed the rivers due to initial habitat disturbances by the weir constructions as well as the barrier roles of weirs on fish passage and migrations. More long-term scientific and systematic fish impact monitoring and assessments($E_s$ and $C_s$) are required in the future to predict changes of ecological structures and functions on the constructions of the weirs.

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References

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