Population Ecology of Korean Rose Bitterling, Rhodeus uyekii (Pisces: Acheilognathinae) in the Bongseocheon, Mankyeonggang (River), Korea

만경강 수계 봉서천에 서식하는 각시붕어 Rhodeus uyekii (Pisces: Acheilognathinae)의 개체군 생태

  • Kim, Hyeong Su (Department of Biological Science, College of Natural Science, Chonbuk National University) ;
  • Ko, Jae Geun (Natural Environmental Restoration Institute Company) ;
  • Choi, Wung Sun (Department of Biological Science, College of Natural Science, Chonbuk National University) ;
  • Park, Jong Young (Department of Biological Science, College of Natural Science, Chonbuk National University)
  • 김형수 (전북대학교 자연과학대학 생물학과, 부설 생물다양성연구소) ;
  • 고재근 (자연환경복원연구원) ;
  • 최웅선 (전북대학교 자연과학대학 생물학과, 부설 생물다양성연구소) ;
  • 박종영 (전북대학교 자연과학대학 생물학과, 부설 생물다양성연구소)
  • Received : 2015.05.18
  • Accepted : 2015.06.24
  • Published : 2015.06.30

Abstract

Population ecology of Rhodeus uyekii (Pisces: Acheilognathinae) was investigated at the Bongseocheon, Mankyeonggang (River) in Korea, from January to December 2014. It mainly inhabits the slow-flowing waters having mud bottoms. Measurement of the standard length of the population indicated that the following standardization: 24~29 mm are one year old, 30~35 mm are two years old, 36~39 mm are three years old, and >40 mm group are regarded over four years old (October in 2014). The spawning season was from March to June, with water temperatures in the range $11.5{\sim}27.0^{\circ}C$. The sex ratio of female : male was 1 : 0.77. The number of eggs in the ovaries was 104~168 ($mean{\pm}SD$: $124{\pm}18.1$). The size of the matured eggs was 2.8~3.5 ($3.2{\pm}0.15$) mm in the long axis, and 1.4~1.5 ($1.4{\pm}0.03$) mm in the short axis. The eggs were found in Unio douglasiae and the number of eggs, larvae or both was 3~18 ($10.2{\pm}5.0$). Stomach contents were mainly phytoplanktons such as the genera Navicular, Cocconeis, Cymbella (Bacilariophyceae) and Cloniophora (Chlorophyceae).

본 연구는 2014년 1~12월까지 전라북도 완주군 용진면 봉서천 일대에서 각시붕어의 개체군 생태조사를 실시하였다. 각시붕어는 정수역의 하상이 주로 뻘로 이루어진 수역에서 대부분 서식하였다. 만 1년생은 체장 24~29 mm, 만 2년생이 30~35 mm, 만 3년생이 36~39 mm, 만 4년생이 40 mm 이상으로 추정되었다 (10월 기준). 산란기는 3월부터 6월까지로 추정되었고 (수온 $11.5{\sim}27.0^{\circ}C$) 성비는 1 : 0.77 (♀:♂)이었다. 포란수는 104~168 ($124{\pm}18.1$)개였고 난경은 장경 2.8~3.5 ($3.2{\pm}0.15$) mm, 단경 1.4~1.5 ($1.4{\pm}0.03$) mm로 나타났다. 각시붕어는 말조개 Unio douglasiae에 난괴를 형성하여 산란하였고 확인된 알 및 자어의 수는 3~18 ($10.2{\pm}5.0$)개로 나타났다. 각시붕어의 주요 먹이생물은 규조류의 Navicula, Cocconeis, Cymbella속과 남조류의 Cloniophora속과 같은 식물성 플랑크톤이 주로 관찰되었다.

Keywords

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