Ecology and Resilient Infrastructure

응용생태공학회 (Korean Society of Ecology and Infrastructure Engineering)
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자갈하천에서 서식처 교란이 어류 군집구조에 미치는 영향

Effects of Habitat Disturbance on Fish Community Structure in a Gravel-Bed Stream, Korea

  • 김석현 (인하대학교 생명과학과) ;
  • 이완옥 (국립수산과학원 중앙내수면연구소) ;
  • 조강현 (인하대학교 생명과학과)
  • 발행 : 2014.10.31
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초록

본 연구는 전형적인 자갈하천인 가평천에서 하천 환경과 서식처 교란이 어류 군집구조에 미치는 영향을 파악하기 위하여, 13개 조사지점에서 미국 환경청의 간편 생물평가법을 적용하여 하천환경을 평가하고 어류 군집구조를 조사하였다. 하천환경 평가 자료를 이용하여 주요인분석을 실시한 결과, 하상 경사와 관계가 있는 하상 서식환경, 유속/수심 체제, 유사 퇴적이 주요한 평가항목으로 판별되었다. 가평천에서 출현한 어종은 12과 46종이었고, 우점종이 참갈겨니 (Zacco koreanus), 아우점종이 피라미 (Z. platypus)이었다. 종별 개체수 자료를 사용하여 계층적 군집분석의 결과, 조사지는 상류, 중류 및 하류의 세 개의 집단으로 구분되었다. 비모수다차원척도법 결과에 의하면, 어류는 하천환경 평가 항목 중 하상 서식환경, 하상 매몰, 유속/수심 체제, 유사 퇴적, 하도 개수, 여울 빈도 항목과 유의한 상관관계가 있었다. 따라서 자갈하천인 가평천에서 어류 군집구조는 일차적으로 하상의 종적 환경 변화에 의하여 영향을 받고, 인위적 교란에 의하여 군집구조에 변화가 나타났다.

Fish assemblages play an integral role in stream ecosystem and are influenced by stream environmental conditions and habitat disturbances. Fish community structures and habitat parameters of U.S. EPA rapid bio-assessment protocol were surveyed to investigate the effect of stream environment and habitat disturbance on fish communities at 13 study sites in the Gapyeong Stream, a typical gravel-bed stream. Principal component analysis (PCA) based on data from habitat assessment at each study site indicated that the study sites were differentiated by habitat parameters such as embeddedness, velocity/depth regime and sediment deposition, which were related with bed slope. A total of 46 species belonging to 12 families were collected in the Gapyeong Stream. A dominant species was Zacco koreanus, subdominant species was Z. platypus. Hierarchical cluster analysis based on species abundance classified fish communities into the three main groups along the stream longitudinal change. Non-metric multidimensional scaling (NMDS) portrayed that fish community structures were related to major habitat parameters, i.e., epifaunal substrate/available cover, embeddedness, velocity/depth regime, sediment deposition, channel alternation and frequency of riffles. These results suggested that fish community structures were primary affected by the longitudinal environmental changes, and those were modified by habitat disturbance in the Gapyeong Stream, a gravel-bed stream.

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