Spatiotemporal Dynamics of Communities and Abundance in Dongshan Bay, South of China.

The genus inhabit estuarine and marine ecosystem throughout the world and can cause severe infections in humans and animals. Previous studies have demonstrated the dynamics of at both community and population levels and assessed the close relationship between environmental factors and diversity and abundance, such as temperature, salinity, and dissolved oxygen. It is also generally believed that aquaculture is the fastest-growing food sector, which is also applying great environmental impacts on microbial communities in aquatic ecosystems. However, our understanding of the spatiotemporal quantification of throughout the four seasons in the aquaculture zone and response to environmental factors remains poor. To explore the spatiotemporal distribution and abundance of the community with their related environmental factors and detect the relationships among them, we collected 10 seawater sites spanning four seasons across the whole year in Dongshan Bay for investigating the community dynamics. Marked differences in diversity and abundance of the community were observed between seasons, which were mainly driven by temperature, dissolved oxygen, nitrate, and nitrite. qPCR analysis showed that abundance was most abundant in the summer (5.37 × 10 copies/L), compared with the autumn (4.58 × 10 copies/L), spring (1.18 × 10 copies/L), and winter (1.55 × 10 copies/L). A total of 22 operational taxonomic units (OTUs) and 28 species were identified by universal bacteria 16S rRNA gene and cultivation methods, with the dominant in these aquaculture areas. To summarize, our present study is one of the few studies to research the occurrence of in marine aquaculture of South China, and the results indicate that are widely distributed in aquaculture environment and that a further risk assessment is needed to be conducted.