Table S1. Daily in situ water temperature, dissolved oxygen (DO), pH (on the total scale), and salinity before the light incubations, measured around midday (12 p.m.). -- Table S2. Identified macrophyte species (25 macroalgae and one seagrass) and corresponding biomass. Values are mean ± SD dry weight in grams per square meter. Only individuals measuring more than 0.5 cm were identified and weighed. -- Table S3. One-way ANOVA summary of (a) macroalgae and (b) macroinvertebrates biomass, (c) number of macroinvertebrate individuals, and (d), (e) their pairwise comparisons. The p-values of the post hoc test were adjusted with the Tukey method. The number of individuals in the macroinvertebrate abundance matrix was ln (x+1) transformed previously to analysis. The asterisk (*) indicates a significant p-value. -- Table S4. Identified macroinvertebrate groups. Upper values are mean ± SD number of individuals per square meter and lower values are mean ± SD dry weight in grams. Gastropoda and Bivalvia weights were measured after removing the shells of the individuals. -- Table S5. (a, c, d) One-way ANOVA summary of oxygen metabolic rates (NPP, R, and GPP) across assemblages. (b, e) Pairwise comparisons. The p-values of the post hoc test were adjusted with the Tukey method. The asterisk (*) indicates a significant p-value. -- Table S6. One-way repeated measures ANOVA summary of pH data from light and dark incubations and across assemblages. The asterisk (*) indicates a significant p-value. -- Table S7. Detailed summary table of incubation data and estimated oxygen fluxes.

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