Ecotoxicological Study of Gammarus sobaegensis by pH Depression in Artificial Channels - Drift behavior -

인공수로에서 산성화 영향에 따른 소백옆새우(Gammarus sobaegensis)의 생태독성학적 연구 - 표류행동을 중심으로 -

  • Park, Jung-Ho (Department of Biology, Kagwon National University) ;
  • Cho, Dong-Hyun (Department of Biology, Kagwon National University) ;
  • Jung, Geun (Division of Biological Environment, Kangwon National University)
  • 박정호 (강원대학교 자연과학대학 생명과학부 생물학전공) ;
  • 조동현 (강원대학교 자연과학대학 생명과학부 생물학전공) ;
  • 정근 (강원대학교 농업생명과학대학 자원생물환경부)
  • Published : 2000.03.01

Abstract

This study was carried out to examine the drift of Gammarus sobaegensis by acid stress as pH depression in Oweol creek from April 1996 to October 1996. The behavioral drifting was revealed to the characteristics of G. sobaegensis that is tend to increase as acid stress. And, tolerance level of G. sobaegensis to pH depression was different among the size classes. Individuals belong to small to medium size classes were weak in lower pH. Pattern of response in G. sobaegensis has a lower tolerance to acid stress at below pH 4.0 than above pH 5.0 in the artificial channel and show the possibility as an effective aquatic ecotoxicity test organism. The result of analysis of variance, water temperature (F-ratio : 66.596, p< 0.0005) and the size classes (F-ratio : 71.386, p< 0.0005) except pH level (F-ratio : 353.415, p<0.0005) were showed to the major factor for drift behavior by acid depression. [Gammarus, pH, Drift, Acid stress, Ecotoxicity test].

본 연구에서는 단각목의 일종인 소백옆새우(G. sobuegensis)를 대상으로 인공수로 하에서 pH 변화를 유도시킬 때 발생되는 개체의 표류행동에 대한 이동특성을 알아보았다. 본 종은 낮은 pH수준의 산성스트레스에서 회피행동이 현저하게 증가한다는 것을 알 수 있었으며, 또한 산성도에 따른 내성범위는 개체의 성숙도 즉 중소형보다 대형개체가 보다 민감하게 반응하는 것을 확인할 수 있었다. 특히 산성 스트레스에 의한 반응이 대형개체에 비해 소형과 중형개체에 있어서 매우 불규칙적으로 나타난 것은, 각종 수환경 변화에 대한 회피능력과도 같은 운동성의 차이 등을 고려해 볼 수 있었다. 전반적으로 인공 수로내의 소백옆새우 대부분 개체들은 전 시기에 걸쳐, pH4.5 이하의 낮은 수준에서 매우 민감하게 반응 한 후, 즉시 하류역 방향으로 수류의 움직임을 따라 능동적으로 회피 이동하는 특성을 보이는 것으로 나타났으며, pH3.0 이하의 강한 산성 스트레스 하에서는 오히려 회피능력을 상실하는 것으로 보여졌다. 또한 ANOVA분석결과, pH(F=353.415, p<0.0005)이외의 몇몇 환경 요인들 중 수온(F=66.596, p<0.0005)과 각 개체의 크기(F=71.386, p<0.0005)등도 낮은 산도에 의한 소백옆새우의 회피행동에 큰 영향을 미치는 주요한 요인이라는 것을 확인할 수 있었다.

Keywords

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