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Cable Bacteria Extend the Impacts of Elevated Dissolved Oxygen Into Anoxic Sediments by Feifei Liu; Zhenyu Wang; Bo Wu; Jesper T. Bjerg; Wenzhe Hu; Xue Guo; Jun Guo; Lars Peter Nielsen; Rongliang Qiu; Meiying Xu is a Environmental Science article available to read on EtoBox.

What is Cable Bacteria Extend the Impacts of Elevated Dissolved Oxygen Into Anoxic Sediments about?

Profound biogeochemical responses of anoxic sediments to the fluctuation of dissolved oxygen (DO) concentration in overlaying water are often observed, despite oxygen having a limited permeability in sediments. This contradiction is indicative of previously unrecognized mechanism that bridges the oxic and anoxic sediment layers. Using sediments from an urban river suffering from long-term polycyclic aromatic hydrocarbons (PAHs) contamination, we analyzed the physicochemical and microbial responses to artificially elevated DO (eDO) in the overlying water over 9 weeks of incubation. Significant changes in key environmental parameters and microbial diversity were detected over the 0-6 cm sediment depth, along with accelerated degradation of PAHs, despite that eDO only increased the porewater DO in the millimeter subfacial layer. The dynamics of physicochemical and microbial properties coincided well with significantly increased presence of centimeter-long sulfide-oxidizing cable bacteria filaments under eDO, and were predominantly driven by cable bacteria metabolic activities. Phylogenetic ecological network analyses further revealed that eDO reinforced cable bacteria associated inter

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Author

Feifei Liu; Zhenyu Wang; Bo Wu; Jesper T. Bjerg; Wenzhe Hu; Xue Guo; Jun Guo; Lars Peter Nielsen; Rongliang Qiu; Meiying Xu

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)