Insignificant effects of elevated CO2 on bacterioplankton community in a eutrophic coastal mesocosm experiment

There is increasing concern about the effects of ocean acidification on marine biogeochemical and ecological processes and the organisms that drive them, including marine bacteria. Here, we examine the effects of elevated CO2 on bacterioplankton community during a mesocosm experiment using an artificial phytoplankton community in subtropical, eutrophic coastal waters of Xiamen, Southern China. We found that the elevated CO2 hardly altered the network structure of the bacterioplankton taxa present with high abundance but appeared to reassemble the community network of taxa present with low abundance by sequencing of the bacterial 16S rRNA gene V3-V4 region and ecological network analysis. This led to relatively high resilience of the whole bacterioplankton community to the elevated CO2 level and associated chemical changes. We also observed that the Flavobacteriia group, which plays an important role in the microbial carbon pump, showed higher relative abundance under elevated CO2 condition during the developing stage of the phytoplankton bloom in the mesocosms. Compared to the CO2 enrichment, the phytoplankton bloom had more pronounced effects on baterioplankton community structure. Our results suggest that the bacterioplankton community in this subtropical, high nutrient coastal environment is relatively insensitive to changes in seawater carbonate chemistry.

Lin X., Huang R., Li Y., Wu Y., Hutchins D. A., Dai M. & Gao K., 2017. Insignificant effects of elevated CO2 on bacterioplankton community in a eutrophic coastal mesocosm experiment. Biogeosciences Discussions 1-36. Article.

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