Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Population Ecology of Acheilognathus chankaensis (Pisces: Acheilognathinae) in the Churyeongcheon (Stream), Korea

추령천에 서식하는 가시납지리, Acheilognathus chankaensis (Pisces: Acheilognathinae)의 개체군 생태

  • Kim, Hyeongsu (Advanced aquaculture research center, National Institute of Fisheries Science) ;
  • Kim, Suhwan (National Institute of Ecology)
  • 김형수 (국립수산과학원 첨단양식실증센터) ;
  • 김수환 (국립생태원)
  • Received : 2021.01.12
  • Accepted : 2021.02.25
  • Published : 2021.04.28
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Abstract

This study surveyed the population ecology of Acheilognathus chankaensis (Pisces: Acheilognathinae) in the vicinity of the Churyeongcheon (Stream) and Seomjingang (River) in Jeonbuk, Korea, from February 2006 to May 2007. The survey found the habits mainly in the slow-flowing waters having sand, mud, and gravel bottoms. Age groups estimated by the standard length-frequency distribution of the population indicated that the one-year-olds were 30-46 mm long, the two-year-olds were 47-58 mm long, the three-year-olds were 59-68 mm long, and the four-year-olds were longer than 69 mm. The gonadosomatic index (GSI) and the ratio of ovipositor length/standard length were the highest in March (♀: 12.9%, ♂: 5.0%) and in April (46.3%), respectively. The ratio of mature egg diameters that were 1.6 mm was highest in May (13.2%). The comprehensive analysis of spawning characteristics showed that the spawning season was from March to June with water temperatures in 11.5-22.5℃, and the sex ratio of female:male was 1:1.13. The fecundity in the ovaries and the number of mature eggs were 318±174.5 (50~583) and 220±139.2 (50~406), respectively. The size of the mature eggs was 2.04±0.110 mm on the long axis and 1.55±0.100 mm on the short axis for the study period. Gut contents of A. chankaensis were mainly phytoplankton such as the genera Fragilaria, Synedra, Navicular, Cymbella (Bacillariophyceae), and Cosmarium (Chlorophyceae).

본 연구는 전라북도 순창군 복흥면 추령천 일대에서 2006년 2월부터 2007년 5월까지 가시납지리의 개체군 생태조사를 실시하였다. 가시납지리는 물의 흐름이 느리고 하상이 주로 모래, 뻘, 잔자갈의 비율이 높은 수역에서 서식하였다. 체장빈도분포법으로 연령을 추정한 결과, 체장 30~46mm 군은 만 1년생, 47~58mm 군은 만 2년생, 59~68mm 군은 만 3년생, 69mm 이상 군은 만 4년생 이상으로 추정되었다. 생식소성숙도지수(GSI)는 3월(암: 12.9%, 수: 5.0%)에 가장 높았고, 산란관길이/체장(Ovipositor length/Standard length)의 비율(%)은 4월(46.3%)에 가장 높았다. 성숙란인 1.6mm 이상 크기의 난경이 차지하는 비율은 5월(13.2%)에 가장 높게 나타났다. 산란기 특성을 종합적으로 분석한 결과 산란기는 3월부터 6월까지로 추정되었고 (수온 11.5~22.5℃) 조사기간 동안 성비는 1:1.13(♀:♂)이었다. 포란수는 318±174.5 (50~583)개, 성숙란수는 220±139.2 (50~406)개, 성숙난의 크기는 장경 2.04±0.110mm, 단경 1.55±0.100mm으로 나타났다. 가시납지리의 주요 먹이생물은 규조류(Bacilariophyceae)의 Fragilaria, Synedra, Navicular, Cymbella 등과 녹조류(Chlorophyceae)의 Cosmarium 같은 식물성플랑크톤이 주로 관찰되었다.

Keywords

Acknowledgement

본 연구를 수행하는데 많은 조언과 가르침을 주신 김익수 교수님께 감사드립니다. 이 논문은 2021년도 국립수산과학원 수산시험연구사업 담수 수산생물 종보존 및 복원 연구(R2021040)의 지원과 2021년도 국립생태원 외래생물연구팀 생태계교란 생물 모니터링 연구사업(NIE-법정연구-2021-09)의 지원으로 수행된 연구입니다.

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