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꺽저기 Coreoperca kawamebari와 꺽지 C. herzi의 공서 하천인 보성강에서 환경 차이에 따른 두 종의 분포와 어류 군집 구조

Distribution of Coreoperca kawamebari and C. herzi and Fish Community Structure in Relation to Environmental Differences in Their Sympatric Area of the Boseong River, Korea

  • 김석현 (인하대학교 자연과학대학 생명과학과) ;
  • 이상헌 (서울대학교 환경대학원 환경계획학과) ;
  • 이완옥 (국립수산과학원 중앙내수면연구소) ;
  • 조강현 (인하대학교 자연과학대학 생명과학과)
  • Kim, Seog Hyun (Department of Biological Sciences, Inha University) ;
  • Lee, Sang Hun (Department of Environmental Planning, Seoul National University) ;
  • Lee, Wan-Ok (Inland Fisheries Research Institute, NFRDI) ;
  • Cho, Kang-Hyun (Department of Biological Sciences, Inha University)
  • 투고 : 2013.05.02
  • 심사 : 2013.07.22
  • 발행 : 2013.09.30

초록

꺽저기 Coreoperca kawamebari는 탐진강 및 인접 하천에 제한적으로 분포하는 반면, 꺽지 C. herzi는 전국의 여러 하천에 분포한다. 두 종의 공서 수역에 대해서 지금까지 보고되지 않았으나, 본 연구에서 섬진강의 지류인 보성강과 영산강의 지류인 지석천에서 두 종의 공서 수역을 확인하였다. 꺽저기와 꺽지의 공서 수역 내에서 하천 환경의 차이에 따른 두 종의 분포 양상과 어류 군집의 특성을 확인하기 위하여 2011년 9월부터 2012년 10월까지 보성강 상류 수역에서 환경 요인과 어류 군집을 조사하였다. 순위 수도 분포 분석에 의하면, 서식지 환경이 다양할수록 꺽저기와 꺽지의 출현 비율이 비슷할 뿐만 아니라 어류 군집의 종다양성이 높았다. 정준대응분석 결과에서 꺽저기는 정체 수역에 서식하는 반면, 꺽지는 하상이 호박돌으로 이루어지고 유속이 빠른 환경에 서식하는 것으로 나타났다. 따라서 본 연구에서는 꺽저기와 꺽지의 서식지 환경이 상이하다는 것을 확인하였고, 하천의 서식지 환경이 단순하면 꺽저기나 꺽지 중 한 종만 출현하고 어류 군집의 종 다양성이 감소하였으며 서식지 환경이 다양하면 이들 두 종이 공존할 수 있고 종 다양성이 증가하는 것으로 파악되었다.

The distribution of Coreoperca kawamebari was known to be restricted to the Tamjin River and several small streams flowing into the southern part of the West Sea, while C. herzi was widely distributed throughout South Korea except the areas inhabited by C. kawamebari: the two species were known to be allopatric. However, we found that both species were sympatric in the Boseong River, a tributary of the Seomjin River, and the Jiseok Stream, a tributary of the Yeongsan River. Local-scale distribution of the two Coreoperca species, fish assemblages, and environmental variables were surveyed to investigate effects of environmental factors on fish community structures in the Boseong River. Rank abundance distribution of fish community at the study sites indicated that fish species diversity and distribution pattern of the two Coreoperca species were closely related to habitat diversity. The result of canonical correspondence analysis showed that C. kawamebari was distributed in pool areas while C. herzi was found in the areas with higher water velocity and boulder substrate. These results suggested that species diversity of fish community decreased and only one of the two Coreoperca species inhabited at the sites with less diverse habitat, but on the other hand, high habitat diversity increased species diversity and allowed the two species to coexist.

키워드

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