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Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
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Published on: January 31, 2025

Mapping the soil microbiome functions shaping wetland methane emissions.

Mikayla A Borton1, Angela M Oliverio2,3, Adrienne B Narrowe2

  • 1Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, Colorado, USA.

Msystems
|June 1, 2026
PubMed
Summary

Freshwater wetlands are major methane emitters, but the microbes driving this process are unclear. This study reveals stable, depth-stratified microbial activity, not flooding, dictates methane production in soils, offering new climate mitigation insights.

Keywords:
MAGgenomeglobal changegreenhouse gasesmetagenomicsmetatranscriptomicsmethanogen

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Area of Science:

  • Soil microbial ecology
  • Biogeochemistry
  • Environmental microbiology

Background:

  • Freshwater wetlands are significant global methane sources, yet the microbial communities and processes responsible for methane emissions remain poorly understood.
  • Understanding these microbial dynamics is crucial for climate change mitigation strategies.

Purpose of the Study:

  • To investigate the microbial membership and methane production in a highly prolific US wetland over five years.
  • To provide a genome-resolved understanding of microbial biogeochemical functions in wetland soils.
  • To identify factors influencing methane hotspots and microbial activity patterns.

Main Methods:

  • Collected over 700 soil samples for metagenomic and metatranscriptomic analysis.
  • Constructed a catalog of 2,502 metagenome-assembled genomes (MAGs) from diverse bacterial and archaeal phyla.
  • Integrated genomic data with 133 soil metatranscriptomes and in situ methane measurements.
  • Analyzed microbial community structure and gene expression across spatial (depth) and temporal gradients.

Main Results:

  • Identified 2,502 MAGs, including novel lineages, revealing microbial diversity in wetland soils.
  • Found that centimeter-scale depth differences were the primary drivers of microbial community structure and function, surpassing land cover and temporal effects.
  • Observed stable, depth-stratified transcriptional profiles of methane-cycling microorganisms, even after flooding-induced redox shifts.
  • Linked co-expression patterns and depth-resolved methane data to specific metabolisms and trophic structures predictive of methane hotspots.

Conclusions:

  • Wetland methane cycling is governed by stable, depth-stratified microbial activity, challenging the assumption that hydrological manipulations alone can control methanogenesis.
  • Spatially organized microbial networks, including methanogens, methanotrophs, fermenters, and iron reducers, are key drivers of methane cycling.
  • Highlights the limitations of genome-only studies and emphasizes the need for in situ activity measurements for effective wetland management and climate modeling.