Down in the dungeons: the hidden role of diatom biofilms and microbial activity in the biogeochemistry of a dynamic estuarine point bar - Duteil, Thibault; Bourillot, Raphaël; Braissant, Olivier; Henry, Adrien; Franceschi, Michel; Olivier, Marie‐Joelle; Le Roy, Nathalie; Brigaud, Benjamin; Portier, Eric; Visscher, Pieter T (Sedimentology, 2025)