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Understanding saltmarsh response to sea-level rise is critical for management and mitigation of these valuable coastal areas. However, comprehensive field studies of sea-level driven changes to the marsh landscape that consider combined biological, geological, and hydrodynamic interactions are rare. This study analyzes ecophysical feedbacks from crab colonization and bioturbation on geotechnical and geochemical properties of the soil in a Mid-AtlanticSpartina alterniflorasaltmarsh. The studyareais within a marsh that is experiencing creek extension due to accelerated sea-level rise and increasing periods of marsh inundation. Measurements of redox potential, pH, belowground biomass, and soil strength reveal that intense crab bioturbation by Sesarma reticulatum significantlychanges the biogeochemical properties ofthesoil.Oxidizedconditionsintheupper10e15cmofthemarshinducedbyburrowingcausesenhanced degradation of S. alterniflora belowground biomass (roots and rhizomes, reduction from 1.9  0.6 kg/m 2 to 1.1  0.4 kg/m 2 ), which reduces the structural integrity of the soil. This process ultimately increases the

The effects of crab bioturbation on Mid-Atlantic saltmarsh tidal creek extension: Geotechnical and geochemical changes