Effects of Temperature, Light and pH on Photosynthesis, and of Light-dark Cycle on Growth Rate and Biomass of Scrippsiella trochoidea and Alexandrium tamarense Seasonal Fluctuation of Scrippsiella trochoidea Cyst Populations in Daya Bay, South China Sea The limitation of maximal quantum yield of photosystem Ⅱ for the detection of nitrogen limitation and phosphorus limitation of Scrippsiella trochoidea Effect of nitrogen and phosphorus concentration on interspecific competition between Skeletonema costatum and Scrippsiella trochoidea Effects of nitrogen and phosphorus limitation on cyst formation of Scrippsiella trochoidea