Marine bacterioplankton community turnover within seasonally hypoxic waters of a subtropical sound: D evil's H ole, B ermuda

Summary Understanding bacterioplankton community dynamics in coastal hypoxic environments is relevant to global biogeochemistry because coastal hypoxia is increasing worldwide. The temporal dynamics of bacterioplankton communities were analysed throughout the illuminated water column of D evil'...

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Bibliographic Details
Published in:Environmental microbiology 2015-10, Vol.17 (10), p.3481-3499
Main Authors: Parsons, Rachel J., Nelson, Craig E., Carlson, Craig A., Denman, Carmen C., Andersson, Andreas J., Kledzik, Andrew L., Vergin, Kevin L., McNally, Sean P., Treusch, Alexander H., Giovannoni, Stephen J.
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Language:English
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Summary:Summary Understanding bacterioplankton community dynamics in coastal hypoxic environments is relevant to global biogeochemistry because coastal hypoxia is increasing worldwide. The temporal dynamics of bacterioplankton communities were analysed throughout the illuminated water column of D evil's H ole, B ermuda during the 6‐week annual transition from a strongly stratified water column with suboxic and high‐ pCO 2 bottom waters to a fully mixed and ventilated state during 2008. A suite of culture‐independent methods provided a quantitative spatiotemporal characterization of bacterioplankton community changes, including both direct counts and rRNA gene sequencing. During stratification, the surface waters were dominated by the SAR 11 clade of A lphaproteobacteria and the cyanobacterium S ynechococcus . In the suboxic bottom waters, cells from the order C hlorobiales prevailed, with gene sequences indicating members of the genera C hlorobium and P rosthecochloris – anoxygenic photoautotrophs that utilize sulfide as a source of electrons for photosynthesis. Transitional zones of hypoxia also exhibited elevated levels of methane‐ and sulfur‐oxidizing bacteria relative to the overlying waters. The abundance of both T haumarcheota and E uryarcheota were elevated in the suboxic bottom waters (> 10 9 cells l −1 ). Following convective mixing, the entire water column returned to a community typical of oxygenated waters, with E uryarcheota only averaging 5% of cells, and C hlorobiales and T haumarcheota absent.
ISSN:1462-2912
1462-2920
DOI:10.1111/1462-2920.12445