Marine bacterioplankton community turnover within seasonally hypoxic waters of a subtropical sound: Devil's Hole, Bermuda

TitleMarine bacterioplankton community turnover within seasonally hypoxic waters of a subtropical sound: Devil's Hole, Bermuda
Publication TypeJournal Article
Year of Publication2015
AuthorsParsons R.J, Nelson CE, Carlson CA, Denman C.C, Andersson AJ, Kledzik A.L, Vergin K.L, McNally S.P, Treusch A.H, Giovannoni S.J
JournalEnvironmental Microbiology
Volume17
Pagination3481-3499
Date Published2015/10
Type of ArticleArticle
ISBN Number1462-2912
Accession NumberWOS:000363448500006
Keywords16s ribosomal-rna; ammonia oxidation; anoxygenic photosynthesis; atlantic time-series; black-sea; cariaco basin; in-situ hybridization; oxic-anoxic interface; oxygen minimum zones; sulfate-reducing bacteria
Abstract

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 Devil's Hole, Bermuda 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 SAR11 clade of Alphaproteobacteria and the cyanobacterium Synechococcus. In the suboxic bottom waters, cells from the order Chlorobiales prevailed, with gene sequences indicating members of the genera Chlorobium and Prosthecochloris - 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 Thaumarcheota and Euryarcheota 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 Euryarcheota only averaging 5% of cells, and Chlorobiales and Thaumarcheota absent.

DOI10.1111/1462-2920.12445
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