Microbial interactions in the anaerobic oxidation of methane: model simulations constrained by process rates and activity patterns: Process modelling of anaerobic methane oxidation
Abstract
Summary Proposed syntrophic interactions between the archaeal and bacterial cells mediating anaerobic oxidation of methane coupled with sulfate reduction include electron transfer through (1) the exchange of H 2 or small organic molecules between methane‐oxidizing archaea and sulfate‐reducing bacteria, (2) the delivery of disulfide from methane‐oxidizing archaea to bacteria for disproportionation and (3) direct interspecies electron transfer. Each of these mechanisms was implemented in a reactive transport model. The simulated activities across different arrangements of archaeal and bacterial cells and aggregate sizes were compared to empirical data for AOM rates and intra‐aggregate spatial patterns of cell‐specific anabolic activity determined by FISH‐nanoSIMS. Simulation results showed that rates for chemical diffusion by mechanism (1) were limited by the build‐up of metabolites, while mechanisms (2) and (3) yielded cell specific rates and archaeal activity distributions that were consistent with observations from single cell resolved FISH‐nanoSIMS analyses. The novel integration of both intra‐aggregate and environmental data provided powerful constraints on the model results, but the similarities in model outcomes for mechanisms (2) and (3) highlight the need for additional observational data (e.g. genomic or physiological) on electron transfer and metabolic functioning of these globally important methanotrophic consortia.
- Authors:
-
[1];
- Univ. of Georgia, Athens, GA (United States)
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Santa Fe Inst. (SFI), Santa Fe, NM (United States)
- Tokyo Institute of Technology (Japan). Earth-Life Science Inst.; California Institute of Technology (CalTech), Pasadena, CA (United States)
- Publication Date:
- Research Org.:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1612579
- Alternate Identifier(s):
- OSTI ID: 1491920
- Grant/Contract Number:
- SC0016469
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Environmental Microbiology
- Additional Journal Information:
- Journal Volume: 21; Journal Issue: 2; Journal ID: ISSN 1462-2912
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Microbiology
Citation Formats
He, Xiaojia, Chadwick, Grayson, Kempes, Christopher, Shi, Yimeng, McGlynn, Shawn, Orphan, Victoria, and Meile, Christof. Microbial interactions in the anaerobic oxidation of methane: model simulations constrained by process rates and activity patterns: Process modelling of anaerobic methane oxidation. United States: N. p., 2018.
Web. doi:10.1111/1462-2920.14507.
He, Xiaojia, Chadwick, Grayson, Kempes, Christopher, Shi, Yimeng, McGlynn, Shawn, Orphan, Victoria, & Meile, Christof. Microbial interactions in the anaerobic oxidation of methane: model simulations constrained by process rates and activity patterns: Process modelling of anaerobic methane oxidation. United States. https://doi.org/10.1111/1462-2920.14507
He, Xiaojia, Chadwick, Grayson, Kempes, Christopher, Shi, Yimeng, McGlynn, Shawn, Orphan, Victoria, and Meile, Christof. Wed .
"Microbial interactions in the anaerobic oxidation of methane: model simulations constrained by process rates and activity patterns: Process modelling of anaerobic methane oxidation". United States. https://doi.org/10.1111/1462-2920.14507. https://www.osti.gov/servlets/purl/1612579.
@article{osti_1612579,
title = {Microbial interactions in the anaerobic oxidation of methane: model simulations constrained by process rates and activity patterns: Process modelling of anaerobic methane oxidation},
author = {He, Xiaojia and Chadwick, Grayson and Kempes, Christopher and Shi, Yimeng and McGlynn, Shawn and Orphan, Victoria and Meile, Christof},
abstractNote = {Summary Proposed syntrophic interactions between the archaeal and bacterial cells mediating anaerobic oxidation of methane coupled with sulfate reduction include electron transfer through (1) the exchange of H 2 or small organic molecules between methane‐oxidizing archaea and sulfate‐reducing bacteria, (2) the delivery of disulfide from methane‐oxidizing archaea to bacteria for disproportionation and (3) direct interspecies electron transfer. Each of these mechanisms was implemented in a reactive transport model. The simulated activities across different arrangements of archaeal and bacterial cells and aggregate sizes were compared to empirical data for AOM rates and intra‐aggregate spatial patterns of cell‐specific anabolic activity determined by FISH‐nanoSIMS. Simulation results showed that rates for chemical diffusion by mechanism (1) were limited by the build‐up of metabolites, while mechanisms (2) and (3) yielded cell specific rates and archaeal activity distributions that were consistent with observations from single cell resolved FISH‐nanoSIMS analyses. The novel integration of both intra‐aggregate and environmental data provided powerful constraints on the model results, but the similarities in model outcomes for mechanisms (2) and (3) highlight the need for additional observational data (e.g. genomic or physiological) on electron transfer and metabolic functioning of these globally important methanotrophic consortia.},
doi = {10.1111/1462-2920.14507},
journal = {Environmental Microbiology},
number = 2,
volume = 21,
place = {United States},
year = {Wed Dec 19 00:00:00 EST 2018},
month = {Wed Dec 19 00:00:00 EST 2018}
}
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