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Change of Benthic Macroinvertebrates Community Composition Following Summer Precipitation Variance

여름철 집중 강우량 변동에 의한 저서성 대형무척추동물 군집구성의 변화

  • 홍철 (국립환경과학원 물환경연구부) ;
  • 김원석 (전남대학교 해양기술학부 환경해양학전공) ;
  • 김진영 (국립생태원 멸종위기종복원센터) ;
  • 노성유 (국립환경과학원 물환경연구부) ;
  • 박지형 (국립환경과학원 물환경연구부) ;
  • 이재관 (국립환경과학원 물환경연구부) ;
  • 곽인실 (전남대학교 해양기술학부 환경해양학전공)
  • Received : 2019.10.18
  • Accepted : 2019.11.27
  • Published : 2019.12.31

Abstract

To investigate the changes of dominant species of benthic macroinvertebrates following summer precipitation variance, we surveyed twenty five sites of the main Seomjin River in May and September in 2014 and 2015. The temperature, precipitation, water quality factors and substrate composition, water depth and flow velocity, which are important factors in benthos habitat environment, were collected and measured. There is not much difference of the cumulative precipitation (CP) between 2014 (2,322.1 mm) and 2015 (2,371.0 mm) in May. However CP in september was decreased by more than half in 2015 (3,726.1 mm) than 2014 (7,678.2 mm). Due to washing effect by summer precipitation, total number of species and individuals for benthic macroinvertebrates were higher in May than in September. Chironomidae spp. and Choroterpes altioculus were dominated in May, Ecdyonurus levis, Ecdyonurus kibunensis were dominated in September. As a result of correlation analysis between community indices and environment factors, it was found that there is a significant correlation with flow velocity and substrate compositions. According to the results of cluster analysis and PCA based on environment fators and dominant species of benthic macroinvertebrates in Seomjin River, it was divided into four groups following CP and MT. Ecdyonurus levis and Ecdyonurus kibunensis reflect the effect of the decrease in summer precipitation.

여름철 집중 강우량 감소에 따른 저서성 대형무척추동물 군집 변화를 알아보기 위하여 섬진강 본류 25지점을 대상으로 2014년과 2015년 각각 5월과 9월 총 4회 조사를 실시하였다. 서식환경에 중요하게 작용하는 요인인 강우량, 기온, 수질, 수심, 유속, 하상구성을 수집하고 측정하였다. 섬진강의 5월 누적강우량(CP)은 2014년 2,322.1 mm, 2015년 2,371.0 mm로 큰 차이를 보이지 않았으나, 9월 CP는 2014년 7,678.2 mm, 2015년 3,726.1 mm로 반절 이상 감소하였다. 여름철 집중강우로 인한 유실효과로, 개체밀도와 종 수는 5월이 9월보다 높았다. 5월은 깔따구류와 세갈래하루살이, 9월은 네점하루살이, 두점하루살이, 세갈래하루살이가 우점을 차지하였다. 생물지수와 환경요인과의 상관성 분석 결과, 하상구성 및 유속과 상관성이 있는 것으로 나타났다. 저서성 대형무척추동물 우점종과 환경요인과의 집괴분석한 결과 5월과 9월의 CP와 MT에 따라 4 그룹으로 나뉘었다. 주성분 분석 결과 집괴분석으로 나뉘어진 그룹의 특성을 잘 반영하였으며, 특히 네점하루살이와 두점하루살이는 강우량의 변동을 잘 반영하였다.

Keywords

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