Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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The Characteristic of Fish Community Following the Restoration of Yangjae Stream

복원에 따른 양재천 어류 군집의 특성

  • Received : 2015.09.30
  • Accepted : 2015.11.13
  • Published : 2015.12.31
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Abstract

From August 2012 to April 2013, the ichthyofauna and post-restoration properties of Yangjae stream were investigated. A total of 1,503 fish of 2 forms, 16 species and 5 families were studied during the survey period. A survey of the distribution of freshwater fish inhabiting Yangjae stream after restoration of the stream showed large populations of Zacco platypus and Rhynchocypris oxycephalus. From the frequency distribution of the total length for the Zacco platypus population inhabiting Yangjae stream, it was estimated that there are 4 distinct age groups, with an abundance of the 27-63 mm (Age $0^+$) category accounting for 51.3% of the population. The regression coefficient (b) for the length-weight relationship in Zacco platypus was 3.27, while the slope of the condition factor was positive, demonstrating that stable growth conditions are being maintained. Analysis of tolerance and trophic guilds showed a decrease in the numbers of sensitive species and insectivore species further downstream, and an increase in tolerant species and omnivore species. Principal component analysis using community indices and indices of biotic integrity (IBI) showed that there were differences according to the survey time: the first and second surveys showed major changes on certain single species populations while during the third survey, it was analyzed that the populations of various types of fish had established balance.

2012년 8월부터 2013년 4월까지 양재천의 어류상과 복원 후 특성을 조사하였다. 조사기간 동안 채집된 어류는 총 5과 18종 1,503개체가 확인되었다. 하천복원 이후 양재천에 서식하는 담수어류 분포 조사결과 피라미(Zacco platypus)와 버들치(Rhynchocypris oxycephalus) 개체군이 높게 나타났다. 양재천에 서식하는 피라미 개체군의 전장 빈도 분포 결과 총 4단계의 연령대가 추정되었으며, 27~63mm (Age $0^+$)가 51.3%로 가장 높게 나타났다. 피라미의 전장-체중 상관도의 회귀계수 b값은 3.27, 비만도지수 slope는 양의 값으로 안정적인 생육상태를 유지하고 있었다. 내성도와 섭식도 길드 분석 결과 하류로 내려갈수록 민감종과 충식종은 개체수 풍부성이 감소하고, 내성종과 잡식종은 증가하였다. 군집지수와 IBI지수를 활용한 주성분 분석 결과 조사시기에 따라 구분되었으며, 1차와 2차조사시 특정 단일종 개체군의 영향이 높고, 3차조사시 다양한 어류의 개체수가 균등하게 서식하는 것으로 분석되었다.

Keywords

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