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. Fig, Examples of Excitation-Emission spectra at T0 (a) and T42 days (b) C: control, L: addition of amino acids, R: addition of riverine DOM, L+R: addition of amino acids and riverine DOM, M and T show locations of the respective fluorescence peaks according to Coble, 1986.

. Fig, Changes in bacterial production and respiration during the incubation. Mean values ± SD of replicate microcosms are shown for each time point. C: control, L: addition of amino acids, R: addition of riverine DOM, L+R: addition of amino acids and riverine

. Fig, Rarefaction curves of observed operational taxonomic units (OTU) based on 16S rRNA gene sequences retrieved from the different samples. C: control, L: addition of amino acids, R: addition of riverine DOM, L+R: addition of amino acids and