Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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The Effects of Natural Disturbances on Benthic Macro-invertebrate

저서성 대형무척추동물의 자연적 교란에 대한 영향

  • Kwak, Inn-Sil (Department of Life Science, Hanyang University) ;
  • Song, Mi-Young (Division of Biological Sciences, Pusan National University) ;
  • Chon, Tae-Soo (Division of Biological Sciences, Pusan National University)
  • 곽인실 (한양대학교 자연과학대학 생명과학과) ;
  • 송미영 (부산대학교 자연과학대학 생명과학부) ;
  • 전태수 (부산대학교 자연과학대학 생명과학부)
  • Published : 2004.03.31
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Abstract

Community dynamics of benthic macroinvertebrates in response to natural disturbances (flooding and water temperature) were investigated in the Suyong and Soktae Streams in Busan from October 1997 to September 1998. Oigochaeta and Chironomus, organic polluted indicators, were dominant and various taxa were observed at the study sites. The density and biomass of two dominant taxa increased in warm months while the indicators were washed away in the flooding season. From October to February when the water temperature was less than $15^{\circ}C$, Oligochaeta appeared to be dominant at the Soktae Stream. In contrast various taxa were collected at the Suyong stream. The densities of Oligochaeta and Chironomus increased at the Soktae and the Suyong streams in March. Due to the big flooding in April, the density of dominant taxa decreased abruptly. The community structure showed differences patterns in the flooding season at two streams from June to August. In the Soktae stream, the density increased in August. The reverse patterns were observed in the Suyong stream, washing out in June followed by slow recovery of densities in the fellowing months. Density and biomass showed relatively higher correlations in most taxa. CCA (Canonocial Correspondence Analysis) showed that taxa was different response to different environmental factors.

부산에 위치한 수영천과 석대천을 1997견 10월부터 1998년 9월까지 월별 정기 조사하여 강우, 수온 및 기온에 따른 군집동태를 연구하였다. 조사하천에서 깔따구류와 빈모류가 우점하여 저서성 대형무척추동물이 다양하게 출현하지 않았다. 수온의 증가는 두 우점군의 풍부도와 생체량을 증가시키는 역할을 하는 반면 잦은 강우는 유실효과를 유발하였다. 온도가 $15^{\circ}C$ 이하였던 10월과 2월 동안 석대천은 빈모류가 수영천에서는 다양한 분류군의 출현을 보였다. 온도가 크게 올라간 3월에 석대천과 수영천은 빈모류와 갈따구류의 증가가 나타났다. 그러나 4월에 큰 강우가 작용하여 석대천과 수영천에서 우점을 이루었던 빈모류와 깔따구류가 감소하였다. 집중강우와 기온상승이 이루어진 6월 이후 적대천은 강우로 오히려 증가되고 8월에 감소된 반면에 수영천은 크게 유실되고 서서히 증가되는 양상을 보여 하천 간에 차이가 뚜렷하였다. 생체량의 변동과 풍부도 동태는 매우 유사한 양상을 보여주었다. CCA분석결과, 수온과 기온은 복족류와 상관성이 높았으며 생물분류군의 환경에 대한 반응은 두 하천에 따라 다르게 나타났다.

Keywords

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