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Vibrio  are widely distributed in aquatic environments and strongly associated with eutrophic environments and human health through the consumption of contaminated seafood. However, the response of the  Vibrio  community to seasonal variation in eutrophic environments is poorly understood. In this study, we used a  Vibrio -specific 16S rRNA sequencing approach to reveal the seasonal distribution pattern and diversity of the  Vibrio  community in the Maowei Sea, Beibu Gulf of China. The Shannon diversity of the  Vibrio  community was highest in the summer, while β-diversity analysis showed that  Vibrio  community structures were significantly different between seasons. Distance-based redundancy analysis (dbRDA) and Mantel test analysis suggested that total dissolved nitrogen (TDN), total dissolved phosphorus (TDP), dissolved inorganic nitrogen (DIN), salinity, and temperature were the key environmental factors shaping the  Vibrio  community structure, indicating a strong filtering effect of trophic condition on  Vibrio  communities. Furthermore, through random forest analysis,  V. fluvialis ,  V. alginolyticus ,  V. proteolyticus ,  V. splendidus , and the other eight  Vibrio  species were more sensitive to eutrophic changes. This study revealed seasonal changes in  Vibrio  communities and the influence of environmental variation on  Vibrio  community composition, contributing to a better understanding of their potential ecological roles in a subtropical inland bay.

Responses of Free-Living Vibrio Community to Seasonal Environmental Variation in a Subtropical Inland Bay