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Abstract Vibrio is a salt‐tolerant heterotrophic bacterium that occupies an important ecological niche in marine environments. However, little is known about the contribution of resource diversity to the marine Vibrio diversity and community stability. In this study, we investigated the association among resource diversity, taxonomic diversity, phylogenetic diversity, and community stability of marine Vibrio in the Beibu Gulf. V. campbellii and V. hangzhouensis were the dominant groups in seawater and sediments, respectively, in the Beibu Gulf. Higher alpha diversity was observed in the sediments than in the seawater. Marine Vibrio community assembly was dominated by deterministic processes. Pearson's correlation analysis showed that nitrite (NO2−‐N), dissolved inorganic nitrogen (DIN), ammonium (NH4+‐N), and pH were the main factors affecting marine Vibrio community stability in the surface, middle, and bottom layers of seawater and sediment, respectively. Partial least‐squares path models (PLS‐PM) demonstrated that resource diversity, water properties, nutrients, and geographical distance had important impacts on phylogenetic and taxonomic diversity. Regression analysis revealed that the impact of resource diversity on marine Vibrio diversity and community stability varied across different habitats, but loss of Vibrio diversity increases community stability. Overall, this study provided insights into the mechanisms underlying the maintenance of Vibrio diversity and community stability in marine environments.

Bacterial communities in marine sediments of the subtropical Beibu Gulf differ significantly from those of other regions. Thus, it is of great importance to study the marine sediment characteristics comprising bacterial composition, diversity, assembly processes, and functional profile. However, such sediments characteristics in subtropical Beibu Gulf remain unclear. Therefore, we studied the diversity, assembly processes, and functional profiles of the bacterial communities in sediment samples collected from 21 sites in the Beibu Gulf. Upon analysis, Proteobacteria was determined to be the dominant phylum using 16S rRNA sequencing. Predominantly deterministic processes shaped the formation of bacterial communities. The predicted bacterial functional groups involved in the carbon cycle (59.06%) were most abundant in the FAPROTAX database, followed by nitrogen (9.25%) and sulfur (1.01%). Furthermore, the composition of the bacterial community was significantly influenced by TC, TP, and TS (p