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여수해만에서 분리한 유독 와편모조류, Gymnodinium catenatum (Graham)의 성장에 미치는 수온, 염분과 광 조건

Effects of Water Temperature, Salinity and Irradiance on the Growth of the Toxic Dinoflagellate, Gymnodinium catenatum (Graham) Isolated from Yeosuhae Bay, Korea

Algae v.19 no.4 , 2004년, pp.293 - 301  
초록

여수해만에서 분리한 Gymnodinium catenatum의 성장에 있어서 최적 수온과 염분 조건을 파악하기 위해 수온 6단계,염분 5단계의 조합에 의한 30단계의 배치배양을 실시하여, 성장속도를 계산하였다. C. catenatum은 약 18${^{\circ}C}$ 이상의 수온과 전 염분단계에서 0.3day$^{-1}$ 이상의 성장속도를 보였으며 수온의 감소와 함께 성장속도도 감소하였다. 하지만 염분은 성장에 그다지 영향을 미치지 않았다. 최대성장속도(0.5day$^{-1}$)는 수온 25${^{\circ}C}$와 염분 30psu에서 얻어졌다. 따라서, 수온과 염분에 따른 성장속도를 고려할 때, C. catenatum은 이른 여름부터 가을까지 한국남해연안해역에서 서식 가능한 것으로 판단된다 이 종의 출현을 예측하기 위한 모델식은 $\mu$ = 0.005-T$^2$ - 0.0001164 T$^3$ - 0.063-S + 0.005-S$^2$ - 0.00007608-S$^3$ - 0.003-T-S + 0.00005308-T$^2$-S로 나타났다. 한편. 수온 18${^{\circ}C}$와 염분 30psu 조건하에서 6단계의 광도 실험을 실시한 결과, 광량에 따른 C. catenatum의 성장은 $\mu$ = 0.16 (I - 10.4)/(1+21.8), (r=0.96)의 관계식으로 Ks는 42.6$\mu$mol m$^{-2}$s$^{-1}$, I$_0$는 10.4$\mu$mol m$^{-2}$s$^{-1}$이었다. 따라서 수온, 염분과 광 조건만을 고려할 경우 C. catenatum은 고수온기 한국 남해 내만과 연안해역에서 우점종으로 출현할 가능성이 높을 것으로 판단되었다.

Abstract

A chain-forming toxic din flagellate, Gymnodinium catenatum (Graham) was known as a paralytic toxin-producer among Gymnodinoid group. In the study, the effects of water temperature, salinity and irradiance on the growth of G. catenatum isolated from Yeosuhae Bay, Korea were investigated. Water temperature range in which G. catenatum showed specific growth rate higher than 0.3 day$^{-1}$ were above about 18${^{\circ}C}$. However, salinity did not have such an effect on growth of G. catenatum. The maximum growth rate (0.5 day$^{-1}$) was obtained at 25${^{\circ}C}$ and 30 psu. The specific growth rate (u) expressed as a polynomial equation as functions of temperature (T; ${^{\circ}C}$) and salinity (S; psu) was $\mu$ = 0.005·T$^2$ - 0.0001164 T$^3$ - 0.063-S + 0.005-S$^2$ - 0.00007608-S$^3$ - 0.003-T-S + 0.00005308-T$^2$-S. Thus, in aspects of water temperature and salinity, the species may be expected to survive in most Korean coastal waters from early summer to autumn. The irradiance-growth curve was described as = 0.16 (I - 10.4)/(1 + 21.8) at 18${^{\circ}C}$ and 30 psu, indicating a half-saturation (Ks) photon flux density (PFD) of 42.6$\mu$mol m$^{-2}s^{-1}$ and compensation PFD (I$_0$) of 10.4$\mu$mol m$^{-2}s^{-1}$. These characteristic responses to irradiance suggest that G. catenatum can reside at the sub-surface.

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