The Estuary of Changjiang River and its adjacent sea areas is the important area of fishery and breed aquacultures, while there has been high frequency of red tide in this area. Diatoms play an important role in the food chain, which are important component of phytoplankton, and some of them are red tide causative species. This paper focuses on the study of diatom biodiversity, community structure, ecological distribution and community dynamics in the main HAB area of East China Sea, which will ...