Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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The Activity Period and Feeding Ecology of the Korean Eastern Spined Loach, Iksookimia yongdokensis (Pisces: Cobitidae)

한국고유종 동방종개 Iksookimia yongdokensis(Pisces: Cobitidae)의 활동주기 및 섭식생태

  • Ko, Myeong-Hun (Division of EcoScience, Ewha Womans University) ;
  • Kim, Hyo-Jin (Interdisciplinary Program of EcoCreative, Ewha Womans University) ;
  • Myung, Ra-Yeon (Division of EcoScience, Ewha Womans University) ;
  • Won, Yong-Jin (Division of EcoScience, Ewha Womans University)
  • 고명훈 (이화여자대학교 에코과학부) ;
  • 김효진 (이화여자대학교 에코크리에티브협동과정) ;
  • 명라연 (이화여자대학교 에코과학부) ;
  • 원용진 (이화여자대학교 에코과학부)
  • Received : 2018.03.09
  • Accepted : 2018.03.23
  • Published : 2018.03.31
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Abstract

The activity period and feeding ecology of the Iksookimia yongdokensis were investigated to obtain baseline data for its ecological characteristics in the Chuksan Stream and Gokgang Stream, Gyeongsangbuk-do, Korea from 2015 to 2016. I. yongdokensis were active on cobble, pebble and sand bottom from March to November when the water temperature exceeded $10^{\circ}C$, but tended to overwinter in cobble and pebble during the winter months (December~February) when the water temperature was lower than $10^{\circ}C$. During the day from 9 am to 15 pm, individuals of I. yongdokensis were highly active with a high rate of food consumption. I. yongdokensis activley fed on the surface of stone, pebble and sand as a filter feeder. Their main food sources analyzed with an index of relative importance (IRI) include Chironomidae (54.7%), Branchiopoda (10.1%), Rotatoria (8.7%), Arcellidae (8.6%), Chlorophyceae (6.5%) and Bacillariophyceae (5.1%). Juveniles of I. yongdokensis (total length 20~39 mm) fed on small-sized preys such as Rotatoria, Branchiopoda and Arcellidae, but they exhibited a transition in their prey-size markedly dominated by large-sized preys such as Chironomidae and Ephemeroptera as they grow.

한국고유종 동방종개 Iksookimia yongdokensis의 행동주기와 섭식생태를 밝히기 위해 2015년부터 2016년까지 경상북도 축산천과 곡강천에서 조사를 실시하였다. 동방종개는 수온이 $10^{\circ}C$ 이상 되는 3월부터 11월까지 돌과 자갈, 모래 바닥에서 나와 활동하였지만, $10^{\circ}C$ 이하가 되는 12월부터 이듬해 2월까지는 기질 속으로 파고 들어가 월동하였다. 하루 중에는 오전 9시부터 오후 15시까지 활발한 활동과 높은 섭식량을 보였다. 동방종개는 주로 돌 표면이나 돌 틈, 모래 표층에서 여과섭식을 하였다. 소화관 내용물을 상대중요성지수(IRI)로 분석한 결과, 깔다구과(Chironomidae, 54.7%)와 새각목(Branchiopoda, 10.1%), 윤충강(Rotatoria, 8.7%), 꽃병벌레과 (Arcellidae, 8.6%), 녹조강 (Chlorophyceae, 6.5%), 규조강(Bacillariophyceae, 5.1%) 등의 순서로 높게 나타났다. 당년생 치어는 먹이 크기가 작은 윤충강과 새각목, 꽃병벌레과 등을 많이 섭식하였으나 성장하면서 먹이 크기가 큰 깔다구과와 하루살이목(Ephemeroptera)을 주로 섭식하여 먹이전환을 보였다.

Keywords

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