Ecological Studies of Epizoic Algae Attached on the Freshwater Fishes in a Small Stream (lan Stream), South Korea

소하천에서 담수어류 표피에 부착된 미세조류의 생태학적 연구

  • Shin, Jae-Ki (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO)) ;
  • Seo, Jin-Won (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO)) ;
  • Yi, Hye-Suk (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO)) ;
  • Jeong, Seon-A (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO)) ;
  • Hwang, Soon-Jin (Department of Environmental Science, Konkuk University)
  • 신재기 (한국수자원공사 수자원연구원) ;
  • 서진원 (한국수자원공사 수자원연구원) ;
  • 이혜숙 (한국수자원공사 수자원연구원) ;
  • 정선아 (한국수자원공사 수자원연구원) ;
  • 황순진 (건국대학교 환경과학과)
  • Published : 2004.12.31

Abstract

Most of the surveys of periphyton carried out for environmental and ecosystem health assessment of streams have considered the impact made on their fixative substrates (stones, rocks, sand, silt, clay and other abiotic matters), but there has been virtually no research that considered moving substrates. This study attempted to make an analysis and assessment of the habitat environments of the microalgae attached to the skin surfaces of fish living in small streams, with a focus on their species composition and community structure. The dominant fish in the this survey were Zacco temmincki and Zacco platypus, which are usually found in the streams, and rivers, and they accounted for 62% and 19%, respectively, in relative abundance. Substrates of fish, a representative organism with the trait of moving a long distance, show a marked contrast with those of organisms fixed at a certain place. Characteristics of both the upstream and the downstream reach well reflected in the microalgae attached to the skin surface of fishes, of which diatoms took the major composition. The result of this observation is considered to be useful to provide basic data in assessment of stream health. Also it may be suggested as a biological tool for the assessment of aquatic environment in the future.

하천의 환경성 평가에서 부착조류 조사는 주로 비이동성 기질(돌, 식물, 모래, 점토 및 식물체 등)에 누적된 영향을 반영한 반면에 이동성 기질을 이용한 연구는 전무한 실정이었다. 본 연구는 소하천 생태계에서 어류 표피에 부착된 미세조류의 종조성과 군집구조를 파악하여 서식처 환경을 분석 평가하고자 시도하였다. 현장 조사에서 우점한 어류는 계류성 어종에 속하는 갈겨니 (Zacco temmincki)와 피라미 (Zacco platypus)이었고, 상대도수는 각각 62%, 19%를 차지하였다. 어류는 광역이동의 대표적인 생물로서 기존의 한 장소에 고정된 부착생물의 기질과는 비교가 될 수 있었고,어류에 부착된 미세조류의 구성으로 볼 때 하천 상하류 구간의 현재 특성을 잘 반영하였다. 부착 미세조류는 규조류가 주류를 이루었고, 다른 분류군도 소수 관찰되었다. 또한, 생태학적 측면에서 하천의 건강성을 평가하는데 유용한 기초자료로 활용될 수 있을 것으로 판단되며 향후 수환경 평가의 생물학적 도구로 제시하고자 한다.

Keywords

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