Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Effects of small dam in a stream on benthic macro-invertebrate community

계류의 소형보가 저서성 대형무척추동물의 군집 특성에 미치는 영향

  • Park, Hyekyung (Department of Biology Education, Seoul National University) ;
  • Lee, Seong Jae (Department of Biology Education, Seoul National University) ;
  • Cheong, SooA (Department of Biology Education, Seoul National University) ;
  • Jeong, Hyeong Rae (Department of Biology Education, Seoul National University) ;
  • Kim, Jae Geun (Center for Education Research, Seoul National University)
  • 박혜경 (서울대학교 사범대학 생물교육과) ;
  • 이성재 (서울대학교 사범대학 생물교육과) ;
  • 정수아 (서울대학교 사범대학 생물교육과) ;
  • 정형래 (서울대학교 사범대학 생물교육과) ;
  • 김재근 (서울대학교 교육종합연구원)
  • Received : 2017.04.14
  • Accepted : 2017.05.23
  • Published : 2017.05.31
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Abstract

To determine the effects of small dam on benthic macro-invertebrate community, benthic macro-invertebrates were surveyed with both quantitative and qualitative collecting methods from 4 sites at a terraced interval (3.02 small dams per 100 m) and from 5 sites at a non-terraced interval (0.96 small dams per 100 m) in upper reach of Dorim stream, Seoul. The average water flow rate was higher at the non-terraced interval (0.149 m/s) than at the terraced interval (0.043 m/s). Diptera, which prefer slow water flow or lentic habitats, appeared more abundantly in the terraced interval (78.3%) than in the non-terraced interval (32.0%)(p<.05). Ephemeroptera, which prefer fast water flow or lotic habitats, appeared more abundantly in the non-terraced interval (14.1%) than in the terraced interval (4.5%)(p=.203). There was a difference in species distribution of Trichoptera in terraced and non-terraced intervals depending on preferred environment. In the terraced interval, the occupancy ratio of gathering-collector was 1.8 times higher than in the non-terraced interval (p<.05). In contrast, filtering-collector appeared to be about 4.4 times higher rate in the terraced interval (p=.124). The evenness indexes (J′) were found to be 0.41 and 0.77, respectively in terraced area and non-terraced intervals. KSI, evaluating biological water quality, showed an average of 4.0 and 2.4 respectively in terraced and non-terraced intervals. EPT/C index, indicating the balance of the community, showed an average of 0.1 and 0.7 respectively in terraced and non-terraced intervals. It suggests that we should make small dams in order to maintain biodiversity of benthic macro-invertebrates.

계류에서 보가 저서성 대형무척추동물 군집에 미치는 효과를 확인하기 위해 도림천 상류에서 계단식 구간(100m 당 3.02개의 보)과 비계단식 구간(100m 당 0.96개의 보)을 나누어 저서성 대형무척추동물을 정성, 정량 조사하였다. 평균 유속은 계단식 구간(0.043m/s) 보다 비계단식 구간(0.149m/s)에서 더 빨랐다. 정수역을 선호하는 파리목(Diptera)는 비계단식 구간(32%)보다 계단식 구간(78.3%)에서 더 많이 출현하였다(p<.05). 유수역을 선호하는 하루살이목(Ephemeroptera)는 계단식 구간(4.5%)보다 비계단식 구간(14.1%)에서 더 풍부하게 출현하였다(p=.203). 날도래목(Trichoptera)는 종에 따라 출현하는 빈도가 다르게 나타났다. 주워먹는 무리(gathering-collector)비계단식 구간보다 계단식 구간에서 1.8배나 많이 출현하였다(p<.05). 반면 걸러 먹는 무리(filtering-collector)는 계단식 구간에서 약 4.4배 더 많이 출현하였다(p=.124). 균등도 지수(J')는 계단식 구간과 비계단식 구간에서 각각 0.41과 0.77로 나타났다. 수환경을 평가하는 데 이용되는 한국오수생물지수 KSI는 계단식 구간과 비계단식 구간에서 각각 4.0과 2.4이었다. 군집의 균형성을 나타내는 EPT/C 지수는 계단식 구간과 비계단식 구간에서 각각 0.1과 0.7으로 나타났다. 본 연구는 저서성 대형무척추동물의 다양성을 유지하기 위해서는 소형보를 계류에 설치할 것을 제안한다.

Keywords

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