Feeding Ecology of the Endangered Korean Endemic Miho Spine Loach, Cobitis choii (Pisces: Cobitidae) in Geumgang River, Korea

멸종위기어류 미호종개 Cobitis choii(Pisces: Cobitidae)의 섭식생태

  • Ko, Myeong-Hun (Division of EcoScience, Ewha Womans University) ;
  • Bang, In-Chul (Department of Life Sciences and Biotechnology, Soonchunhyang University)
  • 고명훈 (이화여자대학교 에코과학부) ;
  • 방인철 (순천향대학교 생명시스템학과)
  • Received : 2018.04.26
  • Accepted : 2018.06.07
  • Published : 2018.06.30

Abstract

Feeding ecology of endangered Korean endemic miho spine loach, Cobitis choii, was investigated in Jicheon Stream, Geumgang River, Korea to provide ecological characteristics and baseline data for its restoration. C. choii is active during daylight hours above sand from March to October when the water temperature exceeded $13^{\circ}C$, but tended hibernate in the stream bottoms (sand) in the winter months (November~February) when the water temperature was lower than $13^{\circ}C$. They fed (index of relative importance, IRI) mainly Diptera (69.9%), Copepoda (23.2%), Arcellidae (2.3%), Branchiopoda (2.0%) and Ploima (2.0%). And their small juvenile (age 0+) fed mainly small size, Ploima and Branchiopoda, however, they ate mainly large size, Chilonomidae, while growing to adult fish (age 2+~3+).

멸종위기종 미호종개 C. choii의 생태학적 특징을 밝히고 복원의 기초자료를 확보하기 위해 섭식생태를 충청남도 청양군 청남면 인양리의 금강지류 지천에서 조사를 실시하였다. 미호종개는 3월부터 10월까지 활동기로, 11월부터 2월까지는 월동기로 나누어졌으며, 활동기에는 주행성 어류로 기질 (모래) 밖으로 나와 활동하였다. 소화관내용물을 상대중요성 지수 (index of relative importance, IRI)로 분석한 결과, 파리목 (Diptera) 69.9%, 요각목 (Copepoda) 23.2%, 꽃병벌레과 (Arcellidae) 2.3%, 새각목 (Branchiopoda) 2.0%, 유영목(Ploima) 2.0% 등의 순으로 높게 나타났다. 크기가 작은 당년생 치어(0년생)는 유영목과 새각목을 주로 섭식하였으나, 성어(2~3년생)는 크기가 큰 깔다구과(Chironomidae)를 주로 섭식하여 차이를 보였다.

Keywords

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