Abstract:Bacterioplankton is composed mainly of heterotrophic bacteria and two types of photosynthetic prokaryote cyanobacteria, Prochlorococcus and Synechococcus. They are basic components of microbial loop, and play an important role in the marine food web. In spring and summer, the tidal front, a significant hydrological feature of the Yellow Sea, plays a key role in the distribution of zooplankton and phytoplankton. To study the influence of tidal front on bacterioplankton, three special surveys were carried ou...