Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
권호 표지

Characterization of Benthic Macro-Invertebrate Communities and Hydraulic Factors in Small- Scale Habitats in a Polluted Stream

오염하천 소규모 서식처에서의 저서성 대형 무척추 동물군집과 수리학적 인자의 특성화

  • Kwak, Inn-Sil (Division of Biological Sciences, Pusan National University) ;
  • Liu, Guangchun (Dept. of Agriculture, Shenyong Univ. P.R. China) ;
  • Park, Young-Seuk (CESA UMR, CNRS-University Paul Sabatier, France) ;
  • Song, Mi-Young (Division of Biological Sciences, Pusan National University) ;
  • Chon, Tae-Soo (Division of Biological Sciences, Pusan National University)
  • Published : 2002.12.31
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Abstract

Benthic macro- invertebrates were collected in a 200 m reach located in the $3^{rd}$ order Yangjae Stream, a tributary of the Han River, Seoul, from April 1996 to March 1998. Although species richness was relatively low due to organic pollution, community abundance patterns appeared to be different depending upon location of the sampling sites. At the sample sites in the straight zone with high water velocity and large substrates, species richness was high and species relatively less-tolerant to organic pollution was additionally present. At the sample sites in the pool zone with lower velocity and high sedimentation, species richness was low and a few tolerant species to organic pollution were abundantly collected. The principle component analysis indicated that some sample sites in the straight zone appeared to be related to water velocity and shear velocity, and associated with diverse taxa less tolerant to organic pollution. Additionally the sample site transplanted with large substrates was associated wit]h hydraulic characters such as substrate diversity and roughness, and was related to species indicating partial recovery of water. The sample sites located at the pool zone tended to be associated with organic matter that had sedimented on to the substrates and the taxa tolerant to organic pollution, including Oligochaeta and Chironomus.

1996년 4월부터 1998년 3월까지 서울의 한강지류 3차 하천인 양재천 200m구간에서 저서성 대형 무척추동물을 채집하였다. 유기물 오염으로 인해 종풍부도가 상대적으로 낮았지만 군집 풍부도양상은 조사지점에 따라 다르게 나타났다. 유속이 높고 큰 하상구성물이 많은 직류부 조사지점에서는 종풍부도가 높았고 유기물오염에 상대적으로 내성이 낮은 종들이 추가적으로 출현하였다. 반대로 유속이 느리고 퇴적이 많이 이루어진 소(pool)에 위치한 조사지점에서는, 종풍부도는 낮았고, 유기오염물에 내성이 강한 수종이 많이 채집되었다. 중요요인분석에서 직류부의 조사지점은 유속, 마찰유속(shear velocity)과 관련성이 있었고, 유기물오염에 내성이 비교적 낮은 다양한 종들과 연관성을 나타냈다. 특히 큰 하상구성물을 심은 지점은 하상구성물의 다양도나 조도(roughness)와같은 수리학적 (hydraulics)특징과 관련되었고, 하천의 부분적 회복을 나타내는 종들과 관계가 있었다. 소에 위치하는 조사지점은 하상구성물에 퇴적한 유기물과 유기물오염에 내성이 강한 빈모류나 깔따구류와 연관을 나타내었다.

Keywords

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