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Area of Science:

  • Environmental Science
  • Microbiology
  • Biogeochemistry

Background:

  • Estuarine wetlands store significant carbon but are vulnerable to rising sea levels.
  • Sea-level rise can alter methane (CH4) emissions and soil carbon sequestration.
  • Sulfate from seawater intrusion may reduce CH4 production, but other factors are influential.

Purpose of the Study:

  • To investigate the relationship between salinity and CH4 fluxes in estuarine wetlands.
  • To identify microbial drivers of CH4 emissions across a salinity gradient.
  • To understand how salinity affects carbon and nitrogen cycling in these ecosystems.

Main Methods:

  • Studied 11 wetland complexes across a salinity gradient in the San Francisco Bay and Delta.
  • Analyzed CH4 fluxes, methanogen abundance, and functional genes.
  • Utilized taxonomic and functional gene data to assess microbial community impacts.

Main Results:

  • CH4 fluxes generally decreased with salinity but were highest in oligohaline wetlands (approx. 3-ppt).
  • Methanogen genes showed weak correlation with CH4 fluxes, indicating other factors are key.
  • Sulfate-reducing fermenters, syntrophic populations, and ammonium dynamics influenced CH4 production and consumption.

Conclusions:

  • Low-level salinity intrusion may increase CH4 flux in tidal freshwater wetlands.
  • Oligohaline conditions can lead to high CH4 emissions, a concern with ongoing sea-level rise.
  • Predicting CH4 fluxes requires accounting for multiple microbial guilds and biogeochemical processes beyond methanogenesis.