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. There is increasing concern about the effects of ocean acidification onmarine biogeochemical and ecological processes and the organisms that drivethem, including marine bacteria. Here, we examine the effects of elevatedCO 2 on the bacterioplankton community during a mesocosm experiment usingan artificial phytoplankton community in subtropical, eutrophic coastalwaters of Xiamen, southern China. Through sequencing the bacterial 16S rRNAgene V3-V4 region, we found that the bacterioplankton community in this high-nutrient coastal environment was relatively resilient to changes in seawatercarbonate chemistry. Based on comparative ecological network analysis, wefound that elevated CO 2 hardly altered the network structure of high-abundance bacterioplankton taxa but appeared to reassemble the communitynetwork of low abundance taxa. This led to relatively high resilience of thewhole bacterioplankton community to the elevated CO 2 level andassociated chemical changes. We also observed that the Flavobacteria group,which plays an important role in the microbial carbon pump, showed higherrelative abundance under the elevated CO 2 condition during the earlystage of the phytoplankton bloom in the mesocosms. Our results provide newinsights into how elevated CO 2 may influence bacterioplankton communitystructure.

biogeosciences

Interactive network configuration maintains bacterioplankton community structure under elevated CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; in a eutrophic coastal mesocosm experiment