Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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The Characteristics of Fish Community and Food Web in Eutrophic Agricultural Reservoir, Jeondae

부영양 농업용저수지인 전대지의 어류군집 및 먹이망 특성

  • Lee, Eui-Haeng (Rural Research Institute, Korea Rural Community Corporation) ;
  • Chang, Kwang-Hyeon (Department of Environmental Science and Environmental Engineering, Kyung Hee University) ;
  • Seo, Dong-Il (Department of Environmental Science and Environmental Engineering, Kyung Hee University) ;
  • Choi, Jong-Yun (Department of Biological Sciences, Pusan National University) ;
  • Joo, Gea-Jae (Department of Biological Sciences, Pusan National University) ;
  • Kim, Mirinae (Rural Research Institute, Korea Rural Community Corporation) ;
  • Shin, Jae Hoon (Rural Research Institute, Korea Rural Community Corporation) ;
  • Son, Misun (Yeongsan River Environment Research Center, National Institute of Environmental Research) ;
  • Nam, Gui Sook (Rural Research Institute, Korea Rural Community Corporation)
  • 이의행 (한국농어촌공사 농어촌연구원) ;
  • 장광현 (경희대학교 환경학 및 환경공학과) ;
  • 서동일 (경희대학교 환경학 및 환경공학과) ;
  • 최종윤 (부산대학교 생명과학과) ;
  • 주기재 (부산대학교 생명과학과) ;
  • 김미리내 (한국농어촌공사 농어촌연구원) ;
  • 신재훈 (한국농어촌공사 농어촌연구원) ;
  • 손미선 (국립환경과학원 영산강물환경연구소) ;
  • 남귀숙 (한국농어촌공사 농어촌연구원)
  • Received : 2014.10.31
  • Accepted : 2014.12.04
  • Published : 2014.12.31
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Abstract

Fish community was investigated in eutrophic Jeondae agricultural reservoir from April to November 2012. The food web structure of major fish species of Jeondae reservoir showed that due to serious organic pollution, the hyper-eutrophic condition with high chemical oxygen demand (COD), chlorophyll-a (Chl-a), total nitrogen (TN) and total phosphorus (TP), as estimated by stable isotope analysis. Total of 679 individuals were collected from the reservoir, and 9 species were identified. Interestingly, Lepomis macrochirus and Hemiculter eigenmanni known as less sensitive to pollution and water quality deterioration, dominated the reservoir, and their relative abundances were 38% and 27%, respectively. Further, the analysis of the stomach contents revealed that main food source of dominant L. macrochirus was high amount of zooplankton, which includes copepoda and cladocera, while Cyprinidae species mainly consumed organic particles with zooplankton preys. Stable isotope analysis also suggested that L. macrochirus, Carassiusauratus, Pseudorasboraparva, and H. eigenmanni are major zooplantivorous group in the Jeondae Reservoir.

본 연구는 부영양 농업용저수지인 전대지에서 2012년 4월~11월까지 실시하였으며, 부영양화 특성, 어류 종조성 및 먹이망 특성을 살펴보았다. 전대저수지는 COD, Chl-a, TN, TP항목 모두 호소 생활환경기준 VI등급(매우 나쁨)으로 나타났으며, 부영양화 단계는 과영양상태(Hyper-eutrophic condition)로, 유기물 오염 및 부영양화가 심각한 것으로 나타났다. 어류는 총 4과 9종 679개체가 출현하였고, 블루길(Lepomis macrochirus, 37.7%)과 치리(Hemiculter eigenmanni, 27.4%)가 우점종 및 아우점종으로 나타났는데, 이들은 수질오염 및 서식지의 질적저하에 대한 내성이 강한 것으로 알려져 유기물 오염과 부영양화가 심각한 전대저수지의 수환경 특성을 적절히 반영하는 결과로 사료되었다. 위내용물 분석에서 잉어과 어류는 유기물 및 동물플랑크톤을 주로 섭식하였으며, 우점종인 블루길은 요각류와 지각류를 포식하는 것으로 나타났다. 채집된 어류와 동물플랑크톤의 안정동위원소를 비교한 결과, 먹이이용을 나타내는 탄소 안정동위원소 비의 유사성이 동물플랑크톤과 블루길, 붕어, 참붕어, 치리에서 높게 나타나 이들 어류는 저수지 내 동물플랑크톤을 주먹이원으로 이용하는 것으로 나타난 반면, 잉어, 갈문망둑 및 꾹저구는 저수지 연안지역의 유기물 및 저서생물을 주먹이원으로 이용하는 것으로 나타났다.

Keywords

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