Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach

Globally coastal sediments are frequently disturbed by a wide range of physical anthropogenic processes (e.g. bottom trawling) which causes resuspension of sediment organic matter (OM) into the overlaying water column. In this study we present experimental results showing that anthropogenic sediment resuspension decreases the organic carbon (14x) and nitrogen (3x) content in the sediment material resuspended to the water column, while no measurable response was found for organic phosphorus. Our findings further suggest that the OM bioavailability decreased and the Carbon:Nitrogen:Phosphorus stoichiometry was changed suggesting that anthropogenic resuspension changes the chemical composition, and/or production and degradation pathways of the OM pool. The detected changes in OM biogeochemistry could affect nutrient release, fuel oxygen depletion and at the same time increase CO 2 production in coastal waters. • Anthropogenic sediment resuspension decreases organic matter content. • Organic matter bioavailability decreases with repeated sediment resuspension. • Sediment resuspension changes chemical composition of organic matter. • Release of nutrients increases with anthropogenic sediment resuspension. • Anthropogenic sediment resuspension could fuel O 2 depletion and increase CO 2 release.