ArticlemSphere2026
Dissolved oxygen concentrations influence microbial community structure and key players in an oxygen minimum zone.
Article in mSphere, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Oxygen minimum zones (OMZs) are expanding in the global ocean. Declining oxygen can alter microbial processes that regulate carbon, nitrogen, and sulfur cycling, including pathways with the potential to produce nitrous oxide (N₂O), a potent greenhouse gas. Yet, we lack a full understanding of how microbial communities respond to declining oxygen in some globally important OMZs. This is particularly true for the understudied northern Benguela Upwelling System (nBUS), an important source of marine N₂O. Here, we analyzed the influence of oxygen concentrations on microbial communities in the nBUS OMZ using 16S rRNA gene sequence data. Microbial diversity did not decline linearly with oxygen and was highest under dysoxic (0.2-2.0 mL/L) conditions and lowest under suboxic (0.0-0.2 mL/L) conditions. This pattern was primarily due to changes in community evenness, which decreased in suboxic samples as the relative abundance of
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