Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Seasonal Fluctuations of Marine Viral Abundances and Physicochemical Parameters in Gwangyang Bay

광양만 해양바이러스 개체수와 물리화학적 요인의 계절적 변동

  • Received : 2012.10.04
  • Accepted : 2012.11.08
  • Published : 2012.11.30
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Abstract

Seasonal distributions of the viral abundance and physicochemical parameters were analyzed at three different regions in Gwangyang Bay. Morphological structure of marine virus was observed using transmission electron microscopy. Most of marine virus had bacteriophage-like structure, but some were similar with eukaryotic microalgal virus, Ectocarpus siliculosus virus (EsV). Viral abundance at Group 1 (closed eutrophic region) was higher than viral abundances at Group 2 (closed oligotrophic region) and Group 3 (open oligotrophic region). Seasonal abundances of marine virus at Group 1 were dynamically changed. The viral density was variably changed from maximum $7.33{\times}10^8ml^{-1}$ in August to minimum $0.3{\times}10^8ml^{-1}$ in December and maintained middle value in spring and autumn. The concentration of nitrogen and phosphate sources was correlated with viral abundance. Particularly, seasonal change of dissolved oxygen concentration was opposite to the variation of viral abundance. These results showed that viral abundances were closely related with fluctuation of marine physicochemical environment in Gwangyang bay.

광양만의 3개의 다른 지역에서 바이러스 개체수와 물리화학적 요인의 계절적 분포도를 분석하였다. 또한 바이러스의 형태적 구조를 투과전자현미경을 이용하여 관찰하였다. 대부분의 해양바이러스는 박테리오파지와 유사한 구조를 갖고 있었으나, 일부는 진핵 미세조류 바이러스인 Ectocarpus siliculosus virus (EsV)와 유사하였다. 그룹 1 (폐쇄된 부영양 지역)에서의 바이러스 개체수는 그룹 2 (폐쇄된 빈영양 지역) 및 그룹 3 (개방된 빈영양 지역)에서의 바이러스 개체수보다 높았다. 그룹 1 바이러스의 계절적 개체수는 크게 변화하였다. 바이러스 개체수는 8월에 가장 높은 $7.33{\times}10^8ml^{-1}$에서 12월에 가장 낮은 $0.3{\times}10^8ml^{-1}$로 변화하였고, 봄과 가을에는 중간값을 유지하였다. 질소원 및 인산원의 농도는 바이러스 개체수에 상관관계를 보였다. 특히 용존산소의 계절적 변화는 바이러스 개체수와 반대 경향을 보였다. 이러한 결과는 광양만에서의 해양바이러스 개체수가 물리화학적 환경과 밀접하게 연관되어 있음을 보여준다.

Keywords

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