Biogeosciences
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Articles | Volume 22, issue 20
Articles | Volume 22, issue 20
https://doi.org/10.5194/bg-22-5991-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-5991-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 20
Research article
 | 
23 Oct 2025
Research article |  | 23 Oct 2025

Influence of carbon source and iron oxide minerals on methane production and magnetic mineral formation in salt marsh sediments

Kaleigh R. Block, Amy Arbetman, Sarah P. Slotznick, Thomas E. Hanson, George W. Luther III, and Sunita R. Shah Walter

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Latest update: 16 Jul 2026
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Short summary
Although thermodynamic considerations and modeling studies predict low methane emissions from salt marshes, significant methane emissions can be observed. We investigate the roles of methylated carbon sources and interspecies electron transfer through conductive iron minerals in promoting methane production by salt marsh microbial communities. We find that a methylated carbon substrate in conjunction with conductive or semi-conductive iron minerals yields the highest rates of methane production.
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