Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Changes in Benthic Macroinvertebrate Community Before and After Rainy Season in Mountain Valley with Erosion Control Dam

사방댐이 설치된 산지계곡의 장마 전·후 저서성 대형무척추동물 군집변화

  • An, Chae-Hui (Dept. of Biological Science, Graduate School, Sangji Univ.) ;
  • Han, Jung-Soo (Dept. of Biological Science, Graduate School, Sangji Univ.) ;
  • Choi, Jun-Kil (Dept. of Biological Science, Sangji Univ.) ;
  • Lee, Hwang-Goo (Dept. of Biological Science, Sangji Univ.)
  • 안채희 (상지대학교 대학원 생명과학과) ;
  • 한중수 (상지대학교 대학원 생명과학과) ;
  • 최준길 (상지대학교 생명과학과) ;
  • 이황구 (상지대학교 생명과학과)
  • Received : 2019.11.29
  • Accepted : 2020.04.02
  • Published : 2020.04.30
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Abstract

This study investigated the change of benthic macroinvertebrates community due to erosion control dams installed in Wonju, Gangwon by comparing the data before and after a rainy season. It selected a closed-type erosion control dam (boulder stone), an open-type erosion control dam (buttress), and a control area and surveyed two upstream points and two downstream points four times between March and September 2019. The flow velocity mostly increased in the closed-type, open-type, and control areas but decreased in St. 3 after the rainy season. The number of benthic macroinvertebrates species and their populations mostly decreased after the rainy season, and the rate of decrease in the populations in the open-type and control areas were more similar than the closed-type area. Species and populations of the EPT groups mostly decreased after the rainy season. A result of the similarity analysis showed that the closed-type and open-type areas were separated by 38.4% with the control area before the rainy season, but the open-type and control areas were separated by 51.3% with the closed-type area after the rainy season. A result of the principal components analysis (PCA) based on axis 1 showed that the closed-type area had a positive value before and after the rainy season, and the open-type and control areas had a negative value before and after the rainy season. The open-type area was more correlated with the control area than the close type. The analysis of the EPT groups showed the distribution of Ephemeroptera in the closed-type area and Trichoptera in the open-type and control areas. The result of this study shows that the installation of erosion control dam can cause changes in benthic macroinvertebrates community and that the open-type area had a smaller difference community difference from the control area after the rainy season than the closed-type area.

본 연구는 강원도 원주시에 설치된 사방댐을 대상으로 장마 전·후의 자료를 비교·분석하여 사방댐에 의한 저서성 대형무척추 동물의 군집 변화를 파악하고자 하였다. 조사시기는 2019년 3월부터 9월까지 총 4회 조사를 실시하였으며, 조사지점은 불투과형 사방댐(전석), 투과형 사방댐(버트리스), 대조지역을 선정하여 사방댐을 기준으로 상류 2지점, 하류 2지점을 조사하였다. 유속은 불투과형, 투과형, 대조지역의 지점에서 대부분 증가하였으며, 불투과형은 St. 3에서 장마 이후 감소하는 것으로 나타났다. 저서성 대형무척추동물의 종수 및 개체수는 장마 이후 대부분 감소하는 것으로 나타났으며, 투과형과 대조지역의 개체수 감소율은 전석에 비해 비교적 유사한 것으로 나타났다. EPT 그룹의 종수 및 개체수는 장마 이후 대부분 감소하는 것으로 나타났다. 유사도 분석 결과, 장마 이전에는 불투과형 및 투과형이 대조지역과 38.4%로 구분되었으나, 장마 이후에는 투과형과 대조지역이 불투과형과 51.3%로 구분되었다. PCA 분석 결과, Axis 1을 기준으로 불투과형은 장마 전·후로 양의 값을 나타내었으며, 투과형과 대조지역은 장마 전·후 음의 값을 나타내어 불투과형 보다는 투과형이 대조지역과 상관성이 높은 것으로 분석되었다. EPT 그룹은 불투과형에서 하루살이목, 투과형과 대조지역에서 날도래목이 분포하는 것으로 분석되었다. 본 연구결과, 사방댐 설치는 저서성 대형무척추동물 군집에 변화를 초래할 수 있으며, 불투과형 보다는 상대적으로 투과형이 대조지역과 장마 이후 군집 차이가 적은 것으로 분석되었다.

Keywords

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