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Original Article

Appearance of Fish Species Based on the Weir's Density in the Four River Systems in Korea

국내 4대강 수계 하천의 보 밀도에 따른 어류 출현종 분석

Woon Ki Moon1
,
Da Hye Noh23
,
Jae Sang Yoo4
,
O Young Lim2
,
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. 93-99
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Abstract

It was confirmed that the fish diversity decreased with increasing index of weir’s density (IWD) in the four river systems. The IWD showed difference with watershed, it was high in the Nakdong River (NDR). Both two river systems of Gum River (GUR) and Yeongsan River (YSR) were similar, whereas relatively lower density observed in the Han River (HNR) system. A result of 2-Dimensional Kolmogorov-Smirnov (2-DKS) as a nonparametic test showed different threshold values affecting fish diversity with the river systems. The p-values based on Dmax, were significantly different at 0.05 level (except for YSR). The threshold values affecting fish diversity were also different with watershed. The values were 1.6/km of the HNR, 1.3/km of the NDR, and 2.3/km of the GUR, respectively. The fish diversity was decreased when IWD is over threshold values. The IWD of total 404 rivers (about 33%) among 1,217 surveyed in this study showed above threshold value. These rivers should be considered first for evaluating river continuity. The IWD and threshold value suggested in this study would be useful for selecting a stream priority for river connectivity study.

Keywords
2-DKS
Connectivity of aquatic ecosystems
Four river systems
Index of weir’s density (IWD)
River connectivity

4대강 수계 하천에 설치된 보 밀도는 어류의 종 다양성에 영향을 주는 요인임을 확인하였다. 보 밀도 지수는 수계별로 차이를 보였으며, 낙동강 수계하천이 가장 높게 나타났으며 (17±1.6), 금강 (1.5±1.3)과 영산강(1.4±1.1)은 비슷하게 나타났다. 반면, 한강 수계하천(1.3±1.2)에서는 보 밀도가 낮게 나타났다. 2-DKS 분석 결과 영산강 수계를 제외하고 Dmax에 따른 p-value는 0.05 이하로서 어류의 출현종수는 보 밀도에 의존하는 것으로 나타났다. 어류 종 다양성에 영향을 주는 보 밀도 역치값 (Threshold value)은 수계별로 다르게 나타났으며. 한강수계 1.6개/km, 낙동강 수계 1.3개/km, 금강수계 2.3개/km 이상에서 어류 출현종수는 감소하는 것으로 나타났다. 본 연구에서 조사한 총 1,217개 하천 가운데 33%인 약 404개 하천의 보 밀도 지수가 역치값 이상인 것으로 나타났다. 이러한 하천은 수생태계 연속성 확보가 시급하기 때문에 우선 대상 하천으로 선정하여 역치값 이하로 보 밀도를 관리할 필요가 있다.

키워드
보 밀도 지수
하천 연결성
수생태계 연속성
4대강 수계
2-DKS
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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 :93-99
  • Received Date : 2022-03-10
  • Revised Date : 2022-05-31
  • Accepted Date : 2022-06-08
  • DOI :https://doi.org/10.17820/eri.2022.9.2.093
Journal Informaiton Ecology and Resilient Infrastructure Ecology and Resilient Infrastructure
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