Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Spatial and Temporal Variation of Macroinvertebrates according to Physical Factors in Gongji Stream Area

공지천 수계에서 물리적인 요인에 따른 저서성 대형무척추동물 군집의 시.공간적인 변동

  • 이재용 ((주) 자연과 사람 환경기술연구소) ;
  • 이광열 (강원대학교 생명과학과) ;
  • 한상진 (강원대학교 생명과학과) ;
  • 이석종 (강원도 보건환경연구원) ;
  • 정유경 (강원대학교 환경과학과) ;
  • 천재룡 ((주) 자연과 사람 환경기술연구소) ;
  • 최재석 (강원대학교 환경연구소) ;
  • 김준철 (강원대학교 생명과학과)
  • Received : 2014.01.17
  • Accepted : 2014.02.27
  • Published : 2014.02.28
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Abstract

Our study is purposed to understand effect on spatio-temporal variability of macroinvertebrate community 11 sampling times at 4 sites between two streams (Shinchon stream and Gongji stream in Chuncheun City) from May 2011 to October 2013. In this study, the possible physical factors on spatio-temporal variability of macroinvertebrate community were discussed. After stream improvement project, the effects of anthropogenic disturbance in study sites appeared as increased water temperature more than $30^{\circ}C$ and the difference of water temperature between Shinchon stream and Gongji stream was by maximum $9^{\circ}C$ on 2012. The monsoon rainfall decreased number of species, individuals and biodiversity index of macroinvertebrate community, particularly, in Shincheon stream compare to Gongji stream. Dominant species of macroinvertebrate taxa was caddisfly in Shincheon stream and Diptera in Gongji stream but on August 2013, it was dominated by Diptera, Chironomidae spp. in all study sites. The spatio-temporal variability of macroinvertebrate community in the streams may be useful as bio-indicator influencing anthropogenic factors such as soil erosion (landslide or cultivation) or monsoon rainfall.

본 연구는 2011년~2013년 사이에 춘천시에 위치하고 종적으로 분포하는 2개 하천(공지천, 신촌천)을 대상으로 각각 2개의 조사 지점에서 저서성 대형무척추동물 군집의 계절 및 공간별 조사를 시행하였다. 본 연구는 하천에서의 인위적인 교란이 저서성 대형무척추동물의 종수 및 개체수의 감소에 미치는 영향을 고찰하였다. 본 연구의 상류구간인 신촌천(St.1, St.2)과는 달리 공지천 구간(St.3, St.4)은 공지천생태하천조성사업의 진행에 따른 인위적인 교란에 빈번하게 노출된 구간이었다. 이 사업 이후 물 흐름의 정체시간이 장기화됨으로 인하여 2012년 하절기에 신촌천 상류(St.1)와 공지천 하류(St.4) 사이에 커다란 수온의 차이(최대 $9^{\circ}C$까지) 및 $30^{\circ}C$ 이상 수온이 증가하는 현상을 보였다. 또한 매년 몬순강우는 저서성 대형무척추동물의 종수 및 개체수 그리고 종 다양도지수의 감소를 초래하였다. 분류군에 따른 우점 양상을 보면, 신촌천 상류에서만 날도래류가 우점하였을 뿐, 그 외의 지점들에서는 파리류가 우세하게 출현하였다. 저서성 대형무척추동물의 시 공간적인 변동은 인위적인 하상의 교란(하상변화, 수온 증가) 및 몬순강우 등으로 인한 토사유입과 같은 물리적인 요인들의 영향을 반영하는 지표생물로서 중요하다.

Keywords

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