Bioavailable Dissolved Organic Carbon Serves as a Key Regulator of Phosphorus Dynamics in Stream Biofilms.

bioavailable dissolved organic carbon eutrophication extracellular enzyme activity microbial biofilms phosphorus sediments sediment–water interface Helmholtz Association 10.13039/501100009318 Deutsche Forschungsgemeinschaft 10.13039/501100001659 PE 3766/1‐1 Open Access funding enabled and organized by Projekt DEAL The elemental composition of the biofilm in terms of C and N showed a slightly significant interaction between before–after and control–impact , indicating an effect of DOC bioavailability on the content of C and N in the biofilm (Table 2 , p < 0.1).

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At high DOC bioavailability, biofilm C and N increased along the TDP gradient following a quadratic regression (red curve, Figure 2a,b ), although the regression coefficients showed only slight significance for biofilm N (Table S1 ).

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