Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
권호 표지

An Evaluation on Health Conditions of Pyong-Chang River using the Index of Biological Integrity (IBI) and Qualitative Habitat Evaluation Index(QHEI)

생물보전지수(Index of Biological Integrity) 및 서식지 평가지수 (Qualitative Habitat Evaluation Index)를 이용한 평창강의 수환경 평가

  • Jung, Seung-Hyun (Dept. of Biology college of National Science, Chungnam National University) ;
  • Choi, Shin-Sok (Dept. of Biology college of National Science, Chungnam National University) ;
  • An, Kwang-Guk (Department of Environmental Science and Engineering Ewha Womans University)
  • Published : 2001.09.29
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Abstract

We evaluated the health condition of Pyong-Chang river, the tributary of Han- River, using the Index of Biological Integrity (IBI) and Qualitative Habitat Evaluation Index (QHEI) during September 1999${\sim}$August 2000. The annual mean of IBI,　which was estimated using eleven metrics, was 49 (range: $45{\sim}51$) and the mean of QHEI, which was estimated using seven parameters, was 88 (range: $76{\sim}94$) during　the study. The river health, based on the IBI criteria of Karr (1981), ranged from "excellent" to "good" conditions, while based on the habitat criteria of Plafkin et al. (1989), it ranged from "pristine" (comparable to reference) to "supporting" conditions. Values of IBI showed slight differences between upstream and downstream sites and QHEI values varied weakly depending on characteristics of variables. Regression analyses showed that annual values of QHEI had no functional relations with stream order (p = 1.82; n = 8) but showed some decreases near slight point-sources. This result indicates that conditions of physical habitat did not change highly with increases of the stream order. According to analyses of feed guilds, relative abundance of insectivores, omnivores and carnivores was 85.1%, 3.5% 0.3%, respectively. Also, relative abundance of sensitive and tolerant species was 75% and 4.6%, respectively, while exotic and morphological anomalies were not found in the river. These outcomes indicate that health condition of fish, based on the trophic conditions of U.S. EPA (1993), was excellent in the river. Regression analyses of IBI values against the QHEI showed that the variation of habitat conditions accounted 57% for the variation of the Index of Biological Integrity (p<0.05; $R^2\;=\;0.57$; n = 7).Overall data of IBI and QHEI suggest that the river health in the present is in optimal conditions but may be degradated by acceleration of chemical inputs and physical-habitat disturbance.

본 연구에서는 1999년 9월에서 2000년 8월 기간동안 생물 보전지수(Index of Biological Integrity, IBI) 및 질적 서식지 평가 지수(Qualitative Habitat EvaluationIndex, QHEI)를 이용하여 한강수계의 상류에 위치하는 평창강의 건강도를 평가하였다. 조사 결과, 11개 메트릭을 이용한 평균 IBI값은 49(범위: 51${\sim}$45)로서 Karr(1981)가 제시한 기준에 의거할 때 하천 건강도(Stream　Health)는 Good${\sim}$Excellent상태 사이에 있었고, 평균 QHEI값은 88(범위: 94${\sim}$76)로서 물리적 서식지측면에서의 건강도는 최적상태 (Comparable to　reference) 혹은 생물의 서식에는 적합한 상태 (Supporting)를 보였다. 지점별 TBI값의 비교에 따르면 상, 하류사이에 미약한 차이를 보인 반면, 각 조사지점의 QHEI값은 이용된 변수특성에 따른 변이를 보였다. 1차 회귀분석 결과에 따르면, QHEI값은 하천차수(Streamorder)와 유의한 관계가 없었다(p=1.8; n=7). 이러한 결과는 하천차수가 증가해도 점 오염원의 부재로 인해 서식지에는 큰 변화가 없었기 때문으로 사료되었다. Feed guild분석에 따르면, 식충성 어류(Insectivore)의 상대 풍부도는 전체 어종의85.1%를,잡식성 어류(Omnivore)및 육식성 어류(Car-nivore)는 각각 전체 어종의 3.5%및 0.3%를 차지하였다. 내성도의 경우, 서식지 파괴 및 오염에 쉽게 감소되는 민감종의 상대 빈도는 75.0%, 내성종은 4.6%로서 뚜렷한 차이를 보였으며, 도입종(exotics species)및 비정상종(anomalies species)의 개체는 채집되지 않았다. 또한 회귀분석 결과, 지점별 평균 IBI값의 변이는 QHEI값의 변화에 의해 57%까지 설명되었다($R^2$=0.57,p<0.05,n=7).본 조사에서 산정된 개개 메트릭 특성, IBI값 및　QHEI값의 상호관계에 따르면, 평창강의 현재 수 환경은 생물 서식에 적절한 상태에서 최적 상태의 범위에 있음이 분명하나, 오염 및 물리적 서식지가 파괴될 경우 감소될 수 있음을 시사하였다.

Keywords

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