Natural environments with frequent drainage experience drying and rewetting events that impose fluctuations in water availability and oxygen exposure. These relatively dramatic cycles profoundly impact microbial activity in the environment and subsequent emissions of methane and carbon dioxide. In this study, we mimicked drying and rewetting events by submitting methanogenic communities from strictly anaerobic environments (anaerobic digestors) with different phylogenetic structures to consecutive desiccation events under aerobic (air) and anaerobic (nitrogen) conditions followed by rewetting. We showed that methane production quickly recovered after each rewetting, and surprisingly, no significant difference was observed between the effects of the aerobic or anaerobic desiccation events. There was a slight change in the microbial community structure and a decrease in methane production rates after consecutive drying and rewetting, which can be attributed to a depletion of the pool of available organic matter or the inhibition of the methanogenic communities. These observations indicate that in comparison to the drying and rewetting events or oxygen exposure, the initial phylogenetic structure and the organic matter quantity and quality exhibited a stronger influence on the methanogenic communities and overall microbial community responses. These results change the current paradigm of the sensitivity of strict anaerobic microorganisms to oxygen exposure.
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http://dx.doi.org/10.1038/s41598-022-20448-5 | DOI Listing |
Ultrasonics
March 2025
Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign (UIUC), Urbana, IL 61801, USA.
Microorganisms
November 2024
Pacific Northwest National Laboratory, Richland, WA 99354, USA.
Drying and rewetting of soil stimulates soil carbon emission. The Birch effect, driven by these cycles, leads to CO efflux, which can be monitored using real-time mass spectrometry (RTMS). Although soil fungi retain water during droughts, their contribution to CO release during drying-rewetting cycles remains unclear.
View Article and Find Full Text PDFGlob Chang Biol
October 2024
Department of Physical Geography, Stockholm University, Stockholm, Sweden.
Climate change is causing an intensification of soil drying and rewetting events, altering microbial functioning and potentially destabilizing soil organic carbon. After rewetting, changes in microbial community carbon use efficiency (CUE), investment in life history strategies, and fungal to bacterial dominance co-occur. Still, we have yet to generalize what drives these dynamic responses.
View Article and Find Full Text PDFFEMS Microbiol Ecol
September 2024
Catalan Institute for Water Research, (ICRA-CERCA), Carrer Emili Grahit 101, 17003 Girona, Spain.
Bacterial communities in river sediments are shaped by a trade-off between dispersal from upstream or nearby land and selection by the local environmental conditions. In temporary rivers (i.e.
View Article and Find Full Text PDFEnviron Monit Assess
September 2024
Central Himalayan Environment Association, Dehradun, 248007, Uttarakhand, India.
Soil efflux of CO ( ) is known to be dependent on natural drying and rewetting of the soil. Although the central Indian Himalayan region is predominantly occupied with two ecosystems, i. e.
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