Microbial community networks associated with variations in community respiration rates during upwelling in nearshore Monterey Bay, California

Environmental Microbiology Reports
Jesse M WilsonJ Michael Beman

Abstract

Respiration of organic material is a central process in the global carbon (C) cycle catalysed by diverse microbial communities. In the coastal ocean, upwelling can drive variation in both community respiration (CR) and the microbial community, but linkages between the two are not well-understood. We measured CR rates and analysed microbial dynamics via 16S rRNA gene sequencing, to assess whether CR correlated with upwelling irrespective of changes in the microbial community, or if the particular microbial community present was a factor in explaining variations in CR. CR varied significantly over time as a function of temperature, dissolved oxygen (DO) and chlorophyll-all of which are altered by upwelling-but also varied with a 'subnetwork' (i.e., a group of microbial taxa that covaried with one another) of the whole community. One subnetwork was associated with higher CR and warmer temperatures, while another was associated with lower CR and DO. Our results suggest that CR in the coastal ocean varies with both environmental variables, and a portion of the microbial community that is not directly correlated with upwelling intensity.

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Citations

Mar 7, 2021·International Journal of Molecular Sciences·Khui Hung LeeGuicheng Zhang

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