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Data S1. Materials and methods.

Table S1. Volume of Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Emiliania huxleyi and Synechococcus sp. cells acclimated to 1, 5, 10, 20 or 30 mm SO42− and of T.  suecica, T.  weissflogii, Synechococcus sp. cells cultured at the same sulfate concentrations and in the presence of Euplotes sp.

Table S2. Dry weight of Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Emiliania huxleyi and Synechococcus sp. cells acclimated to 1, 5, 10, 20 or 30 mm SO42− and of T.  suecica, T.  weissflogii and Synechococcus sp. cells cultured in the presence of the same SO42− concentrations and of the grazer Euplotes sp.

Table S3. Cellular content of chlorophyll a of Synechococcus sp., chlorophyll a and b of Tetraselmis suecica, and of chlorophyll a and c of Thalassiosira weissflogii, Protoceratium reticulatum and Emiliania huxleyi, in the presence of five different SO42− concentrations, and of T.  suecica and T.  weissflogii and Synechococcus sp. cells cultured at the same [SO42−] and in the presence of Euplotes sp.

Table S4a. C quota in Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Emiliania huxleyi and Synechococcus sp. cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii and Synechococcus sp. cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S4b. C quota in Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Emiliania huxleyi and Synechococcus sp. cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii and Synechococcus sp. cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S5a. N quota in Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Emiliania huxleyi and Synechococcus sp. cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii and Synechococcus sp. cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S5b. N quota in Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Emiliania huxleyi and Synechococcus sp. cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii and Synechococcus sp. cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S6a. S quota in Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Emiliania huxleyi and Synechococcus sp. cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii, Synechococcus sp. cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S6b. S quota in Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum and Emiliania huxleyi cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii, Synechococcus sp. cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S7. DMSP per cell content of Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum and Emiliania huxleyi cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S8. DMSP content per volume of Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum and Emiliania huxleyi cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S9. Maximal PSII quantum yield (Fv/Fm) of Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Synechococcus sp. and Emiliania huxleyi cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii and Synechococcus sp. cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

Table S10. Coefficient of energy-dependent non-photochemical quenching (qN), coefficient of non-photochemical quenching (NPQ) and coefficient of photochemical quenching (qL) and of Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum, Emiliania huxleyi and Synechococcus sp. cells acclimated to five different [SO42−].

Table S11. Coefficient of energy-dependent non-photochemical quenching (qN), coefficient of non-photochemical quenching (NPQ) and coefficient of photochemical quenching (qL) in Tetraselmis suecica, Thalassiosira weissflogii and Synechococcus sp. cells cultivated at five different sulfate concentrations and in the presence of Euplotes sp.

Table S12. Sulfate uptake rate of Tetraselmis suecica, Thalassiosira weissflogii, Protoceratium reticulatum and Emiliania huxleyi cells acclimated to five different [SO42−], and of T.  suecica, T.  weissflogii cells cultivated at the same sulfate concentrations and in the presence of Euplotes sp.

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