Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Habitat Characteristics and Feeding Ecology of the Siberian Stone Loach Barbatula toni (Pisces: Namacheilidae) in the Bukcheon (Stream)

북천에 서식하는 종개 Barbatula toni(Pisces: Namacheilidae)의 서식지 특징 및 섭식생태

  • Received : 2021.10.28
  • Accepted : 2021.12.02
  • Published : 2021.12.31
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Abstract

The habitat characteristics and feeding ecology of the Siberian stone loach Barbatula toni were investigated in Bukcheon (Stream), Eocheonri, Ganseong-eup, Goseong-gun, and Gangwon-do, Korea from January to December 2013. B. toni lived in rapids or slow rapids from the upper stream to downstream, with the largest number of inhabitants in the middle-downstream regions. As a result of analyzing habitat preferences by age, 0+ and 1+ to ≥3+ showed differences. Ages of 0+(juveniles) lived mainly in rapidly flowing water (37.6±26.79 cm/sec) and low water depths (13.3±9.47 cm) in the pebble bottoms (substratum particle size 9.5±6.66 cm), but ages 1+ to ≥3+ lived mainly in relatively slowly flowing water (13.3±17.33 cm/sec) and relatively deep depths (25.9±10.31 cm) in stone and large stone bottoms (substratum particle size 18.0±7.63 cm). B. toni was mainly eaten from March to December when the temperature was above 5℃, and the amount of food eaten peaked in June and October. Their main food sources analyzed by the index of relative importance (IRI) included Diptera (57.0%), Ephemeroptera (29.3%), and Trichoptera (13.5%). The juveniles (age 0+) fed on small-sized prey such as Diptera and Trichoptera whales, but as they grew, they mainly ate large-sized Ephemeroptera. These feeding habits and changes in food according to the growth of B. toni were very similar to those of sibling species, B. nuda.

북천에 서식하는 종개 Barbatula toni의 서식지 특징 및 섭식생태를 밝히기 위해 2013년 1월부터 12월까지 강원도 고성군 간성읍의 북천에서 조사를 실시하였다. 종개는 최상류부터 최하류까지의 여울 또는 느린 여울의 돌과 자갈 바닥에 서식하였는데, 채집개체수는 중·하류부가 가장 많았다. 연령별로 서식지 선호도를 분석한 결과 당년생(0+)과 1년생(1+)~3년생이상(≥3+)은 구별되었는데, 당년생은 유속이 빠르고(37.6±26.79 cm/sec) 수심이 낮으며(13.3±9.47 cm) 자갈 바닥(하상크기 9.5±6.66 cm)에 주로 서식하였지만, 1년생~3년생 이상은 유속이 비교적 느리고(13.3±17.33 cm/sec) 수심은 비교적 깊으며(25.9±10.31 cm) 작은돌과 큰돌 바닥(하상크기 18.0±7.63 cm)에 주로 서식하여 차이를 보였다. 종개는 주로 5℃ 이상 되는 3월부터 12월까지 섭식을 하였고, 평균섭식량은 6월과 10월에 정점을 보였다. 소화관 내용물을 상대중요성지수(IRI)로 분석한 결과, 파리목(Diptera, 57.0%), 하루살이목(Ephemeroptera, 29.3%), 날도래목(Trichoptera, 13.5%) 등의 순으로 높게 나타났다. 당년생 치어는 크기가 작은 파리목과 날도래목을 주로 섭식하였으나 성장하면서 크기가 큰 하루살이목을 주로 섭식하여 먹이전환을 보였다. 이러한 종개의 먹이습성 및 성장에 따른 먹이변화는 자매종 대륙종개 B. nuda와 매우 유사하였다.

Keywords

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