Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Relationship between Distributional Characteristics of Heterotrophic Dinoflagellate $Noctiluca$ $scintillans$ and Environmental Factors in Gwangyang Bay and Jinhae Bay

광양만과 진해만에서 종속영양와편모조류 $Noctiluca$ $scintillans$의 분포특성과 환경인자와의 관계

  • Baek, Seung-Ho (Korea Ocean Research and Development Institute/South Sea Institue) ;
  • Shin, Hyeon-Ho (Korea Ocean Research and Development Institute/South Sea Institue) ;
  • Kim, Dong-Sun (Marine Environment Research Department, KORDI) ;
  • Kim, Young-Ok (Korea Ocean Research and Development Institute/South Sea Institue)
  • Received : 2011.03.02
  • Accepted : 2011.04.15
  • Published : 2011.05.31
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Abstract

To understand the spatio-temporal fluctuations and ecological characteristics of heterotrophic dinoflagellate $Noctiluca$ $scintillans$, we investigated their population densities and environmental factors during four seasons at 20 stations of Gwangyang Bay and at 23 stations of Jinhae Bay in 2010. $N.$ $scintillans$ was seasonally abundant during spring and summer, with temperature ranging 15 to $27^{\circ}C$ in the both bays, whereas the density reduced in fall and winter. The populations of $N.$ $scintillans$ at each station in both bays showed a significantly positive relationship with water temperature, indicating that relatively high water temperature within its optimum temperature stimulates the growth of $N.$ $scintillans$ population. In particular, low water temperature (<$4^{\circ}C$) and salinity (<12 psu) led to disappear of $N.$ $scintillans$ population, although they were observed at all season in both bays. Spatio-temporal variations of Chl.$a$ concentration was not significantly correlated with $N.$ $scintillans$ population densities. However, the $Noctiluca$ abundances were also high during spring and summer season when relatively high Chl.$a$ concentration was observed in both bays. This result suggests that standing crops of phytoplankton may be one of important contributing factors to enhance the abundance of $N.$ $scintillans$.

야광충 $Noctiluca$ $scintillans$의 시공간적 변동과 생태학적 특성을 이해하기 위해서 그들의 개체수 밀도와 환경인자를 광양만 20개 정점과 진해만 23개 정점에서 2010년 춘계, 하계, 추계, 동계의 계절 조사를 수행하였다. 야광충 $N.$ $scintillans$는 광양만과 진해만에서 $15{\sim}27^{\circ}C$ 수온 범위의 춘계와 하계에 높은 밀도가 유지된 반면, 동계와 추계는 그들의 개체수가 감소하였다. 두 해역에서 야광충의 개체수는 수온과 유의한 상관관계가 성립되었고, 이는 수온 증가와 더불어 $N.$ $scintillans$의 증식이 활발해 진다는 것을 의미한다. 특히, 두 해역에서 4계절 모두 야광충의 출현은 확인하였으나, 저온(<$4^{\circ}C$)과 저염(<12 psu)에서 그들 개체를 관찰할 수 없었다. 먹이생물의 지표가 되는 Chl.$a$ 농도와 야광충의 개체수는 유의한 상관관계를 확인할 수 없었으나, 두 해역에서 Chl.$a$ 농도가 현저하게 높았든 춘계와 하계에 야광충 개체수밀도가 높게 나타났다. 결과적으로 식물플랑크톤의 현존량은 야광충 $N.$ $scintillans$의 개체수 증감을 제어하는 중요한 인자로 판단되었다.

Keywords

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