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ISSN : 1229-3431(Print)
ISSN : 2287-3341(Online)
Journal of the Korean Society of Marine Environment and Safety Vol.25 No.2 pp.229-236

The Effect of Temperature, Salinity and Irradiance on the Growth of Alexandrium affine (Dinophyceae) Isolated from Southern Sea of Korea

Ji Hye Kim,Seok Jin Oh,Seok-Yun Kim


The effects of temperature, salinity and irradiance on the growth of dinoflagellate Alexandrium affine were examined. A maximum specific growth rate (0.69 day-1) was observed with a combination of 25℃ and 25 psu. Optimal growth (80% of the maximum specific growth rate) was obtained at 20-26℃ with salinities of 20-35 psu. The results indicated that A. affine is relatively stenothermal of given high water temperature and is a euryhaline species. The irradiance-growth curve found can be described as μ=0.75(I-4.25)/(I+65.47). The compensation photon flux density (Ic) and half-saturation photon flux density (KI) were 4.25 μmol m-2 s-1 and 57.0 μmol m-2 s-1, respectively. In conclusion, A. affine has advantageous physiological characteristics that enable it to be a dominant species in coastal areas with high water temperature and a large salinity gradient, in spite of relatively low irradiance.

한국 남해에서 분리한 와편모조류 Alexandrium affine의 생장에 미치는 수온, 염분 그리고 광량의 영향



와편모조류 Alexandrium affine의 생장에 대한 수온, 염분 및 광 조건 실내실험을 통해서 살펴보았다. A. affine의 최대성장속도(0.69 day-1)는 수온 25℃, 염분 25psu로 나타났으며, 최적생장(최대성장속도의 80%)은 수온 20~25℃의 염분은 20~35psu로 나타났다. 따라서 A. affine는 비교적 협온성이며, 광염성의 생리학적 특성을 가지고 있는 것으로 생각된다. 광량에 따른 생장 실험결과에서 유도된 생장식은 μ=0.75(I-4.25)/(I+65.47)로, 보상광량(Ic)은 4.25μmol m-2 s-1, 반포화광량(KI)은 57.0μmol m-2 s-1로 나타났다. 결론적으로 A. affine는 하계에 낮은 광, 염분의 변동 폭이 큰 연안해역에서도 우점화 할 수 있는 유리한 생리적 특성을 보이는 것으로 판단된다.