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Marine bacteria play crucial roles in the ecosystem functioning of the globalocean.To better understand the interaction between bacterial communitiesand environmental changes in the Bohai Strait,China,which is an importantwaterway connecting the Bohai Sea to the open ocean,seasonal dynamicsand spatial variations of bacterial communities in this area were studied using16S rRNA pyrosequencing.The abundances of Synechococcus(3.9-fold)andVibrionaceae(6.7-fold)were remarkably higher in summer than in winter,whilePelagibacter was more abundant(2.1-fold)in winter compared to summer.Vibrionaceae was much more abundant in section B than in adjacent sectionsrevealed the spatial heterogeneity or patchiness of bacterial communities.Thepersistent taxa(e.g.Rhodobacteraceae,Flavobacteriaceae)maintaining acommon taxonomic background may be crucial to ecosystem function.Community diversity was significantly higher in winter than in summer.Therare OTUs played a more important role than the abundant OTUs in structuringthe bacterial communities.Temperature and concentrations of nitrite andphosphate were the determinants of bacterial community structure,explainingmost of community difference.Network revealed that their influence focusedon a few taxa(e.g.Synechococcus,Planctomyces,NS4 marine group,NS5marine group)and lead to significant variations of the bacterial communitie.