Tidal Effects on Biogeochemical Processes in Salt Marsh Sediments
Author Information
Author(s): Martial Taillefert, Stephanie Neuhuber, Gwendolyn Bristow
Primary Institution: Georgia Institute of Technology
Hypothesis
How does tidal forcing influence biogeochemical processes in intertidal salt marsh sediments?
Conclusion
Tidal forcing significantly affects the distribution of redox geochemical species in intertidal salt marsh sediments, with different processes dominating in creek and mud flat environments.
Supporting Evidence
- Tidal cycles influence the geochemical signatures of porewaters and solid phases in salt marsh sediments.
- Creek sediments experience higher hydrostatic pressure gradients than mud flat sediments.
- Iron reduction is sustained in intertidal creek sediments, while sulfate reduction dominates in mud flat sediments.
Takeaway
Tides change how chemicals move in salt marsh mud, affecting how bacteria break down materials in the mud. This means that the mud can be different depending on whether the tide is high or low.
Methodology
The study used in situ voltammetry and ex situ measurements to analyze sediment cores and porewater chemistry at two sites during tidal cycles.
Limitations
The study's findings may not apply to all intertidal environments due to the specific conditions at the Skidaway Island salt marsh.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website