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Change of Ichthyofauna and Fish Communities after Complete Removal of Large Mouth Bass, Micropterus salmoides (Perciformes; Centrachidae) in Farm Reservoir, Korea

농업용저수지에서 생태계교란 생물 배스 Micropterus salmoides 완전제거 후 어류상의 변화 및 군집 분석

  • Jae Goo Kim (Alpha Research Ecology Institute) ;
  • Yun Jeong Cho (National Institute of Ecology) ;
  • Cheol Woo Park (Alpha Research Ecology Institute) ;
  • Jong Wook Kim (Alpha Research Ecology Institute) ;
  • Su Hwan Kim (National Institute of Ecology)
  • 김재구 (알파생태연구원) ;
  • 조윤정 (국립생태원 생태안전연구실) ;
  • 박철우 (알파생태연구원) ;
  • 김종욱 (알파생태연구원) ;
  • 김수환 (국립생태원 생태안전연구실)
  • Received : 2023.08.14
  • Accepted : 2023.10.24
  • Published : 2023.11.30

Abstract

Since its introduction in 1973, the bass, Micropterus salmoides, has spread to dams and rivers in Korea, adversely affecting native fish communities. In this study, after complete removal of bass from Bukchosan Reservoir, an farm reservoir that has lost its function, an attempt was made to indirectly confirm the adverse effects of bass on fish by comparing fish communities in reservoirs of a similar size where bass inhabit. The study was conducted three times a year from 2019 to 2022. As a result of the study, in Bukchosan Reservoir, where the species composition of fish was judged to be simplified due to the habitat of bass, only four species such as Carassius auratus and Rhinogobius brunneus that could be used as a food source for bass appeared before the removal of bass, but after the removal of bass. The appearance and increase of the population of the introduced small freshwater fish (Oryzias sinensis, Rhinogobius giurinus) were confirmed. When comparing Gangjeong Reservoir, Susim Reservoir, which are other reservoirs inhabited by bass investigated in this study, and Bukchosan Reservoir, this result is judged to show a trend of stabilization and recovery of fish species after removal of bass in small reservoirs with high predation pressure of bass.

배스 Micropterus salmoides는 1973년에 도입된 이래로 국내의 댐, 하천 등에 퍼져, 토착 어류군집에 악영향을 미쳐왔다. 본 연구에서는 농업용수공급의 기능을 상실한 유휴저수지인 북초산제에서 배스를 완전제거한 후, 배스가 서식하는 비슷한 규모의 저수지 어류군집을 비교하여 배스가 어류군집에 미치는 악영향을 간접적으로 확인하고자 하였다. 연구는 2019년에서 2022년까지 연 3회에 걸쳐 수행하였다. 연구 결과, 배스의 서식으로 어류의 종조성이 단순해진 것으로 판단되는 북초산제에서 배스의 제거 이전 배스의 먹이원으로 이용될 수 있는 붕어와 밀어 등 4종만이 출현하였으나, 배스의 제거 이후 상류 및 농수로에서 유입된 소형담수어(대륙송사리, 갈문망둑)의 출현과 개체수의 증가가 확인되었다. 본 연구에서 조사한 배스가 서식하는 다른 저수지인 강정제, 수심제와 북초산제를 비교하였을때, 배스의 포식압이 높은 소형저수지에서 배스의 제거 이후 어류상은 안정화 및 회복세로 변화하는 것으로 판단된다.

Keywords

Acknowledgement

본 조사는 국립생태원의 외래생물 안전관리 연구사업 중 생태계교란 생물 모니터링 NIE-법정연구-2023-09의 사업에 의해 수행되었습니다.

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