Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Ecological Characteristics and Distribution of Fish in the Downstream Region of Gyeongan Stream

경안천 하류구간에 서식하는 어류의 분포 및 생태특성

  • Lee, Eui-Haeng (Rural Research Institute, Korea Rural Community Corporation) ;
  • Kim, Mirinae (Rural Research Institute, Korea Rural Community Corporation) ;
  • Kim, Hyun-Mac (Ecosystem Assessment Division, National Institute of Environmental Research) ;
  • Son, Misun (Yeongsan River Environment Research Center, National Institute of Environmental Research) ;
  • Chang, Kwang-Hyeon (Department of Environmental Science and Environmental Engineering, Kyung Hee University) ;
  • Nam, Gui-Sook (Rural Research Institute, Korea Rural Community Corporation)
  • 이의행 (한국농어촌공사 농어촌연구원) ;
  • 김미리내 (한국농어촌공사 농어촌연구원) ;
  • 김현맥 (국립환경과학원 자연평가연구팀) ;
  • 손미선 (국립환경과학원 영산강물환경연구소) ;
  • 장광현 (경희대학교 환경학 및 환경공학과) ;
  • 남귀숙 (한국농어촌공사 농어촌연구원)
  • Received : 2013.11.05
  • Accepted : 2013.11.27
  • Published : 2013.12.31
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Abstract

Fish field survey, especially fish distribution and their ecological characteristics, was performed in the downstream region of Gyeongan stream during the period of before (June) and after (October) the summer monsoon in 2010. Depending on the characteristics of each site, fyke net or casting net was used for fish sampling. Feeding classification was determined by the analysis of stomach contents. Total number of family and species sampled were 5 and 17, respectively. The dominant family was Cyprinidae (12 species), and relative abundance (RA) of the most dominant species, Lepomis macrochirus and Zacco platypus, was 38% and 24%, respectively. Exotic species and Korean endemic species observed were 3 (423 individuals, RA 44%) and 4 (98 individuals, RA 10%), respectively. Tolerance guild analysis as characteristics of ecological indicators revealed an undoubtedly high percentage (97%), compared to others as reflected by the identification of just one sensitive species. Analysis of trophic guilds showed that L. macrochirus dominated among insectivores (44% RA). The food of L. macrochirus composed of, aquatic insects, benthic invertebrates, zooplankton, Chironomidae, and waterweed. Thus, we determined that L. macrochirus could be classified as insectivores (partially carnivores) in this study. Conversely, Z. platypus consumed Cladocera exclusively, greater than 90% of their feed. We presume that stable isotope analysis would identify the exact position of these species in the food web.

본 연구는 팔당호로 유입되는 경안천 하류구간에서 2010년에 집중강우 전(6월) 후(10월)로 구분하여 어류현장조사 및 생태특성을 분석하였다. 현장조사는 조사지점의 특성에 따라 일각망과 투망을 이용하였으며, 섭식특성은 종별 위내용물 분석을 통해 실시하였다. 현장조사결과, 총 5과 17종 970개체가 출현하였으며, 잉어과가 가장 많은 종(12종)이 출현하였고, 블루길(38%)과 피라미(24%)가 주요 우점종으로 나타났다. 외래도입어종은 3종 423개체로 44%의 높은 상대풍부도를 보이는 것으로 나타난 반면, 한국고유종은 4종 98개체로 10%의 상대풍부도를 보였다. 생태지표특성 중 내성도 분석에 따르면, 내성종의 상대풍부도가 97%로 단연 우세하게 나타났으며, 민감종은 1종이 출현하였다. 영양단계 분석에 따르면, 블루길의 우점현상에 의해 충식종의 상대풍부도가 44%로 가장 높게 나타났다. 주요종에 대한 섭식특성은, 우점종으로 나타난 블루길이 치어, 수서곤충, 저서성무척추동물, 동물플랑크톤, 깔따구류(유충), 수초 등을 다양하게 섭식하여, 육식/충식성으로 판단되었으며, 아우점종인 피라미는 지각류가 섭식량의 90% 초과하는 비율을 차지하고 있었다. 향후 본 연구에 안정동위원소 분석을 병행한다면 종별 먹이망 내 정확한 위치파악이 가능할 것으로 사료되었다.

Keywords

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