The classical view of fluvial sediment transport considers only physical interactions between the river flow and riverbed particles. Experiments and theory suggest that microbial biofilms reduce sediment mobility by binding many grains together.
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Packman, A. Building bacterial bridges. Nature Geosci 6, 682–683 (2013). https://doi.org/10.1038/ngeo1938
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DOI: https://doi.org/10.1038/ngeo1938