Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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A Study on the Disturbance and the Rehabilitation of Stream by Using Evaluation of Ichthyofauna to Disturbed Ecosystem

어류상 평가를 활용한 하천 생태계의 교란 및 회복 유형 고찰

  • Received : 2010.03.22
  • Accepted : 2010.04.26
  • Published : 2010.06.30
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Abstract

Streams changed by artificial factor those support positive functions but also negative function to humanbeing. Time and pathway exceed the lost of structure and negative function appearing as disturbance. Therefore, it is desirable to prepare right situation to break of a vicious circle. Stream ecology was evaluated with using ichthyofauna during three years at the three disturbed sites and reference sites in Nakdong River. Forty-one species belonging three orders and ten families were identified in six surveying sites of Nakdong River during 2007~2009. Korean endemic species (14 species, 34.1%) and alien (3 species, 7.3%) were identified in Nakdong River ichthyofauna. Species number, species diversity, ecosystem structure and habitat variability of ecosystem were applied to evaluate stream ecosystem. In view of three year comprehended data at six sites; numeric instability appeared Andong Dam and Naeseongcheon sites worse than Gamcheon and reference site, otherwise more numeric diversity appeared Gamcheon and reference site than Andong Dam and Naeseongcheon. As a result of integration, sand stream including downstream of Andong dam, Naeseongcheon and Gamcheon has been having more diversified biodiversity and habitat diversity than those in the pebble stream.

인위적 요인에 의해 특성이 바뀐 하천은 인류에게 좋은 기능을 제공하기도 하나 역기능을 주기도 한다. 역기능은 주로 교란으로서 교란이 나타나면 하천의 구조 및 기능 상실은 시간의 경과에 따라 심화된다. 따라서 이 악순환을 끊기 위하여 현황에 대책 마련이 바람직하다. 낙동강에서 하천교란이 이루어진 3개 구간 및 대조구간에서 3년간 어류상을 활용하여 하천생태를 평가하였다. 2007년부터 2009년까지 낙동강의 6개 조사지점에서 나타난 어류상은 3목 10과 41종이었다. 확인된 어종 중 한국고유종은 14종 (34.1%), 외래어종은 3종 (7.3%)이었다. 하천 생태평가 시 출현 종 수, 군집분석, 생태계 구조 및 서식처 다양성을 적용하였다. 6개 지점의 3년 종합 자료 평가를 보면 안동댐 하류, 내성천 수계에서는 출현어종의 수적 불안전성을 나타낸 반면 감천은 안동댐 수계보다 출현종의 다양성이 나타나고 있었다. 안동댐 하류, 내성천, 그리고 감천을 포함하는 모래하천은 임하댐 하류 및 길안천을 포함하는 자갈하천보다 생물 다양성과 서식처 다양성이 우수한 것으로 나타났다.

Keywords

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