Pithakpol, S. Kawaga University, santiwat@stmail.ag.kagawa-u.ac.jp
Tada, K. Kagawa University, tada@ag.kagawa-u.ac.jp
Montani, S. Kagawa University, montani@ag.kagawa-u.ac.jp

 
THE GROWTH OF A COMMON HETEROTROPHIC RED TIDE DINOFLAGELLATE, NOCTILUCA SCINTILLANS , FED ON NUTRIENTS STRESSED ALGAE
 
The occurrence of Noctiluca scintillans red tide has frequently been observed in the Seto Inland Sea, Japan, for several decades. The studies on the growth efficiency of this dinoflagellate species, however, have scarcely been carried out and most of them were using nutrient replete algae as a food source. This is the first report that evidently shows the growth efficiency and the potential of N . scintillans to become the large streak of red tide when fed on nutrient stressed algae as usually been found in the early spring season, especially at the end of the spring bloom period. N . scintillans was fed on both nutrient rich and nutrient depleted Chattonella antiqua (Raphidophyceae) and Ditylum brightwellii (Bacillariophyceae) in the laboratory condition. The maximum growth rates of N . scintillans were obtained when nutrient replete algae were provided as food. They were 0.71 and 0.76 per day for N . scintillans fed on C . antiqua and D . brightwellii , respectively. The growth rates of N . scintillans fed on N-limited growth algae were relatively low. We have also found that phytoplankton biomass in the study area was not enough to support the extraordinary growth of this heterotroph. The effects of food stoichiometry on the growth of N . scintillans and their roles in the coastal ecological system will be discussed.
 
Day: Tuesday, Feb. 2
Time: 02:30 - 02:45pm
Location: Hilton of Santa Fe
 
Code: SS01TU0230H