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We tested the hypothesls that proteln adsorbed to submlcron par t~cles In seawater IS more slowly degraded than the same proteln freely d~ssolved Bacterial hydrolysis of methyl-3H-bov~ne serum a lbum~n ( 3 H B S ~ ) dlssolved or adsorbed to particles (polystyrene latex beads diameters 0 126 to 1 5 pm) was examlned Mlxed bactenal assemblages cultured on BSA media, 2 bactenal ~sola tes , and a natural marlne bactelial assemblage hydrolyzed adsorbed 'H-BSA at much slower rates (1/10 to <1/200] than free 'H-BSA We compared our hydrolysls rates wlth the predicted collision probabilities between bactena and 3 H B S ~ freely dlssolved or adsorbed to beads of different diameters These comparisons suggest that the hydrolysls rate is ~nfluenced pnmanly by the transport rate of 'k-I-BSA to bacteria Hydrolysis of adsorbed 3 H B S ~ differed greatly between 2 bactenal strains whlch appears to be explained by differences In the afflnity of bactenal proteases to 3 H B S ~ OUI results support the hypothesls that adsorption onto subm~cron particles greatly reduces degradation rate of protelns and suggest thdt the adsorption of dissol\ied organic matter (DOM) may be a mechanism that temporarily stores lablle DOM in a slowly degrading, seml-labile pool, whlch makes 11 available for export and further modification by geochem~cal processes KEY WORDSBacterial degradation Dissolved organlc matter . Adsorption . Collolds

Bacterial degradation of protein adsorbed to model submicron particles in seawater