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국내 남부권역 주요 수계 농수로의 어류 군집 특성

Fish distribution and community characteristics of agricultural waterways in the southern region of Korean watersheds

  • 지성민 (고려대학교 생명공학부) ;
  • 성무성 (충남대학교 생물과학과) ;
  • 김정훈 (영남대학교 생명과학과) ;
  • 박준휘 (한림대학교 생명과학과) ;
  • 김현구 (한림대학교 생명과학과) ;
  • 안광국 (충남대학교 생물과학과)
  • Ji, Sung-Min (Division of Biotechnology, Korea University) ;
  • Sung, Mu-Sung (Department of Biological Sciences, Chungnam National University) ;
  • Kim, Jeong-Hun (Department of Life Sciences, Yeungnam University) ;
  • Park, Joon-Hwi (Department of Life Science, Hallym University) ;
  • Kim, Hyun-Gu (Department of Life Science, Hallym University) ;
  • An, Kwang-Guk (Department of Biological Sciences, Chungnam National University)
  • 투고 : 2019.12.14
  • 심사 : 2020.03.12
  • 발행 : 2020.03.31

초록

본 연구는 국내 주요 수계 중 만경강, 섬진강, 남해권 수계, 탐진강, 영산강, 동진강과 연결된 농수로 어류의 종 조성과 어류 길드 특성, 군집 특성을 분석하였다. 2017년 9월부터 2018년 8월까지 4회에 걸쳐 현지 조사를 시행한 결과, 어류는 농수로에서 6목 11과 53종 3,633개체가 출현하였고 본류에서 9목 15과 57종 7,108개체가 출현했다. 농수로의 우점종과 아우점종은 칼납자루(Tanakia koreensis)와 납자루(T. lanceolata)로 나타났으며, 납자루아과의 어종이 우점하는 지점이 10지점 중 6지점으로 나타났다. 이는 담수성 이매패류의 서식에 기인한다고 사료된다. 그리고 환경부 지정 멸종위기 야생생물 I급 임실납자루(T. somjinensis)가 섬진강 수계의 농수로에서 출현했고, 멸종위기 야생생물 II급 큰줄납자루(Acheilognathus majusculus)와 꺽저기(Coreoperca kawamebari)가 각각 섬진강 수계, 섬진강과 탐진강 수계의 농수로에서 출현했다. 지점별로 어류 길드 분석 결과, 대체로 농수로가 본류보다 낮은 민감종의 비율을 나타냈다. 군집 분석 결과 하상 구조가 복잡하게 나타난 지점에서 비교적 안정적인 군집을 보였으며, 환경적 변수에 따른 분석 결과 하상 구조가 복잡한 농수로 그룹이 높은 다양도 지수와 낮은 우점도 지수를 나타냈다. 결과적으로 본 연구는 농수로의 어류 서식 특성을 나타내고, 향후 연구와 관리의 필요성을 제시했다.

The objective of our study was to analyze the distribution and composition of fish species and their community characteristics in agricultural waterways in the six water systems-Mankyung River, Seomjin River, Namhae Region, Tamjin River, Yeongsan River, and Dongjin River-during 2017-2018. Little is known about the distributions and community characteristics of the aquatic biota of agricultural waterways in Korea, even if the water bodies have important roles as spawning areas or habitats for fish. In this study, we identified 3,633 fish individuals in the waterways, belonging to 53 species, eleven families, and six orders (dominant species: Tanakia koreensis, T. lanceolate) and 7,108 fish individuals in the main rivers, belonging to 57 species, fifteen families, and nine orders. Moreover, three endangered wildlife (designated by the Ministry of Environment, Korea)-T. somjinensis, Acheilognathus majusculus and Coreoperca kawamebari-were found in the waterways. By fish guild analysis, we found that many waterways had a lower proportion of sensitive species and a higher proportion of omnivore species than those of the main rivers, which indicates a feature of a disturbed environment. In addition, by grouping with environmental variables, we found the group of waterways with high substrate complexity had a higher diversity index (Shannon index) and a lower dominance index (Simpson index) than that of simple substrate complexity. Overall, our study represents the characteristics of fish habitats in agricultural waterways and suggests the need to manage them and study further.

키워드

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