LAUSR

One hundred and twenty-six surface diatom samples were analysed to investigate the characteristics of their assemblages and the seawater migration pathway from the inshore waters of the western Bohai Bay. For this task we used correspondence analysis (CA) and discussed the seawater pathway according to the distribution of freshwater diatoms and their abundance. Result shows that a total of 49 species and 32 genera are identified, of which Cosinodiscus excentricus, Cosinodiscus radiatus, Actinocyclus normanii and Cyclotella stylorums are the dominant species. The study area is divided into four diatom combination zones. The freshwater diatoms are regularly distributed in the study area and range from 0.48%-13.13%. In the waters south of the Duliujian River estuary, the proportion of freshwater diatoms decreases from south to north, indicating that the water currents tend to move in the same direction. In the southeastern sea area of the Lingang Economic Zone, due to land reclamation and hydrodynamic condition changes, freshwater diatoms are deposited. In the bay north of the Haihe River estuary, coastal currents are characterized by a clockwise circulation.