Research on competiting growth of some harmful algae to phosphate in co-exist bath incubation
混合培养条件下几种赤潮藻对无机磷源的竞争生长研究

The co-exist batch incubation experiment of harmful algae Prororenctrum donghaiense & Skeletonema costatum (PS) and P. donghaiense & Alexandrium catenella were carried out to study the competiting growth response of these species to phosphate. The results showed that the growth rate of S. costatum was far higher than that of P. donghaiense whatever in the P-rich or in the P-scarce condition and became the absolutely dominant species. While in the co-exist culture of P. donghaiense and A. catenella, P. donghaiense went death and this might be due to the allelopathy of A. catenella. Alkaline phosphatase activity (APA) increased greatly with P stress and might play an important role in controlling population competition via hydrolyzing metabolized dissolved organic phosphorus in the latter period.