영산강 하구역의 춘계와 하계에 출현하는 어류플랑크톤의 종조성과 개체수
Species composition and abundances of ichthyolplankton in Yeongsan River Estuary in Spring and Summer
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초록
이 연구는 영산강하구역의 정점에서 2018년부터 2020년까지 춘계와 하계의 환경자료와 자치어 자료를 분석하였다. 종조성에서 출현한 자치어는 망둑어과 자치어가 전체출현 개체수의 85%로 가장 우점하였고 그 다음으로 많이 출현종은 청베도라치로 3% 출현하였다. 군집분석 결과, 공간적인 분포는 춘계와 하계로 구분되었다. 영산강하구역은 하굿둑의 개폐로 영향을 많이 받는다고 알려져 있는데 본 연구에서도 담수방류와 고수온 현상으로 춘계와 하계에 출현 분류군과 출현 개체수가 변동하는 경향을 나타냈다.
Abstract
This study was conducted to provide the basic information on environment effects on appearance of ichthyoplankton in the Yeongsan River Estuary in Spring and Summer from 2018 to 2020. Data were obtain from the database of ‘Coastal Ecosystem’ in “National Survey of Marine Ecosystem.” Among the abundance ichthyoplankton species, the Gobiidae spp. dominated, accounting for 85% of the total abundances with the secondary dominant species being the Parablennius yatabei, representing 3% of the abundances. Cluster analysis results revealed a composition differentiated between spring and summer. The Yeongsan River Estuary is known to be significantly influenced by the opening and closing of estuarine gates. In this study, the fluctuation in the number of occurrence groups and abundance among the years and season is attributed to the phenomenon of high water temperature period and the freshwater discharge.
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