Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Interpretation of Trophic Positions Using the CSIA Approach: Focusing on the Invasive Fish Lake Skygazer Chanodichthys erythropterus

화합물안정동위원소 분석법을 활용한 낙동강 이입종 강준치 Chanodichthys erythropterus의 영양단계 해석

  • Eun-Ji Won (Institute of Ocean and Atmospheric Sciences (IOAS), Hanyang University) ;
  • Ha-Eun Cho (Department of Marine Science and Convergent Technology, Hanyang University) ;
  • Dokyun Kim (Department of Marine Science and Convergent Technology, Hanyang University) ;
  • Ji-Woong Choi (Daon Eco. Co., Ltd.) ;
  • Kwang-Guk An (Department of Bioscience and Biotechnology, Chungnam National University) ;
  • KyungHoon Shin (Institute of Ocean and Atmospheric Sciences (IOAS), Hanyang University)
  • Received : 2023.08.30
  • Accepted : 2023.09.21
  • Published : 2023.09.30
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Abstract

Invasive predators are one of the most damaging species groups to biodiversity. In the Nakdong River, the lake skygazer Chanodichthys erythropterus is a dominant species that is fiercely carnivorous and a concern for commercial fish. Although it is important to understand the ecological characteristics related to the feeding habit, studies on the diets of lake skygazer in Nakdong River have been limited to studies of gut contents. In this study, the trophic position (TP) and feeding habits of C. erythropterus were studied by calculating TPs using samples collected from 13 sites throughout the Nakdong River. Compound-specific isotopic analysis of amino acids provided reliable TPs from the muscle of Lake skygazer C. erythropterus without any isotope baseline. The results were approximately 3 to 3.6 and suggesting a carnivorous but size-dependent prey variation. In particular, the TP variability of C. erythropterus observed in the Nakdong River showed that it had a selective feeding habit compared to carnivorous fish species of relatively similar trophic levels.

강준치 C. erythropterus는 육식성 어종으로 이 종이 낙동강 전역에서 극우점하게 됨에 따라 상업성 어종이 감소하는 등 여러 이슈가 있어왔으며 이들의 섭식과 관련된 생태 특성을 이해하는 것이 중요함에도 불구하고 섭식특성에 대한 연구는 위 내용물에 대한 분석에 국한되어 수행되어왔다. 본 연구에서는 낙동강 이입종인 강준치 C. erythroterus의 생태학적 특성을 이해하기 위한 연구의 일환으로 낙동강 일대 13개 정점에서 채취한 강준치 표본으로부터 화합물의 안정동위원소 분석 기법을 활용하여 영양학적 지위(trophic position)를 계산하고 섭식특성을 해석하였다. 아미노산의 질소 안정동위원소 분석은 C. erythropterus 단독의 시료로부터 신뢰할 수 있는 TP를 도출할 수 있게 하였으며, 그 결과 개체의 크기에 따라 약 3에서 3.6으로 증가하는 결과를 얻었다. 또한 성체에서 관찰된 TP의 변동성을 통해 상대적으로 유사한 영양단계를 갖는 육식성 어종에 비해 선택적인 섭식 습성을 가지고 있음을 확인하였다.

Keywords

Acknowledgement

본 연구는 2022년 환경부 재원으로 한국환경산업기술원(KEITI)에서 지원하는 "생활화학제품 안전관리 기술개발사업 [2020002970007, 1485018715]"과 낙동강수계관리기금 환경기초조사사업을 통해 수행되었습니다.

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