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Our primary research paper (Mu et al.,  2014 ) demonstrated selective changes to a deep subsurface prokaryotic community as a result of CO 2  stress. Analyzing geochemical and microbial 16S rRNA gene profiles, we evaluated how  in situ  prokaryotic communities responded to increased CO 2  and the presence of trace organic compounds, and related temporal shifts in phylogeny to changes in metabolic potential. In this focused review, we extend upon our previous discussion to present analysis of taxonomic unit co-occurrence profiles from the same field experiment, to attempt to describe dynamic community behavior within the deep subsurface. Understanding the physiology of the subsurface microbial biosphere, including how key functional groups integrate into the community, will be critical to determining the fate of injected CO 2 . For example, community-wide network analyses may provide insights to whether microbes cooperatively produce biofilm biomass, and/or biomineralize the CO 2 , and hence, induce changes to formation porosity or changes in electron flow. Furthermore, we discuss potential impacts to the feasibility of subsurface CO 2  storage of selectively enriching for particular metabolic functions (e.g., methanogenesis) as a result of CO 2  injection.

The geomicrobiology of CO2 geosequestration: a focused review on prokaryotic community responses to field-scale CO2 injection