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Original Article

Impact of the Crossed-Structures Installed in Streams and Prediction of Fish Abundance in the Seomjin River System, Korea

하천에 설치된 횡구조물의 영향 및 섬진강 수계의 어류 풍부도 예측

Woon Ki Moon1
,
Da Hye Noh23
,
Jae Sang Yoo4
,
Lim O Young2
,
Myoung Chul Kim5
,
Ji Hye Kim6
,
Jeong Min Lee6
,
Jai Ku Kim7*
문 운기1
,
노 다혜23
,
유 재상4
,
임 오영2
,
김 명철5
,
김 지혜6
,
이 정민6
,
김 재구7*
1Senior Researcher, Department of Environmental Ecology, Environment Solution Partners, Co., Gyeonggi 14348, Korea
2Researcher, Department of Environmental Ecology, Environment Solution Partners, Co., Gyeonggi 14348, Korea
3Master, Department of Biology Education, Chungnam National University, Daejeon, 34134, Korea
4Director, Department of Environmental Ecology, Environment Solution Partners, Co., Gyeonggi 14348, Korea
5President, SOKN Institute of Ecology and Conservation, Inc., Gyeonggi 12563, Korea
6Technical Expert, Watershed Planning Division, Yeongsan River Basin Environmental Office, Gwangju 61945, Korea
7Research Director, Department of Environmental Ecology, Environment Solution Partners, Co., Gyeonggi 14348, Korea
1(주)엔솔파트너스 책임연구원
2(주)엔솔파트너스 연구원
3충남대학교 생물교육학 석사
4(주)엔솔파트너스 상무
5(주)SOKN생태보전연구소 연구소장
6영산강유역환경청 유역계획과 전문위원
7(주)엔솔파트너스 기업부설연구소장
*Corresponding Author
30 June 2022. pp. 100-106
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Abstract

The relationships between river length and weir density versus fish species observed were analyzed for 210 local rivers in the Seomjin River system (SJR). A nonlinear exponential relationship between river length and number of fish species were observed. Model coefficient was 0.03 and coefficient of determinant (R2) was 0.59, meaning that about 59.0% of total variance was explained by river length variable. Predicted value by model and observed number of species showed a difference. About 110 local rivers (about 52.4%) showed lower value than predictive value. The average index of weir’s density (IWD) in the SJR was about 2.7/km, which was significantly higher than that of other river basins. As a result of nonparametric 2-Kimensional Kolmogorov-Smirnov (2-DKS) analysis based on the IWD, the threshold value affecting fish diversity was about 2.5/km (Dmax=0.048, p<0.05). Above the threshold value, it means that the number of fish species would be decreased. In fact, the ratio of the expected species to the observed species was lowered to less than 70%, when the IWD is higher than the threshold value. To maintain aquatic ecological connectivity in future, it is necessary to manage IWD below the threshold value.

Keywords
2-DKS
Density of weir
Fish diversity
Nonlinear exponential relationship
Seomjin river system
Threshold value

섬진강 수계 210개 지방하천을 대상으로 하천연장과 보 밀도 대비 어류 출현종 현황을 분석하였다. 하천연장에 따른 어류 출현종수는 비선형지수함수 (Nonlinear exponential relationship) 관계를 보였다. 모델에 따른 계수값 (b)은 0.03이며, 결정계수 (R2)은 약 59.0%인 것으로 나타났다. 모델식에 따른 예측기대종수는 실제 출현종수와 차이를 보였으며, 대상하천 가운데 약 110개 하천 (약 52.4%)에서 실제 출현종수는 예측기대종수보다 낮게 나타났다. 한편 섬진강 수계 하천에서 나타난 평균 보 밀도는 약 2.7개/km였으며, 이는 타 수계 하천과 비교시 월등히 높은 수치였다. 보 밀도 지표 (Index of Weir’s Density, IWD)에 따른 어류출현종수간의 2-DKS 분석 결과 어류 다양성에 영향을 주는 보 밀도 역치값 (Threshold value)은 약 2.5개/km인 것으로 나타났다 (Dmax=0.048, p<0.05). 실제 보 밀도 지표가 역치값 이상인 경우 어류 출현종수 대비 기대 종수비율은 70% 미만으로 낮아졌다. 따라서, 향후 수생태계 연속성 확보를 위한 보 밀도는 역치값 이하로 관리하는 것이 필요하다.

키워드
섬진강 수계
비선형지수함수
2-DKS
어류 다양성
역치값
보 밀도
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Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 9
  • No :2
  • Pages :100-106
  • Received Date : 2022-03-10
  • Revised Date : 2022-05-31
  • Accepted Date : 2022-06-08
  • DOI :https://doi.org/10.17820/eri.2022.9.2.100
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