This study shows that different carbon sources (L-alanine, trehalose, diatom lysate, sediment extract) were amended into a coastal seawater sample to conduct a 90-day incubation, which allowed to observe the transformation of different dissolved organic matter (DOM) in the context of microbial community succession. Here, we submit the Fourier transform ion cyclotron resonance- Mass Spectrometry data showing DOM composition in the control and different carbon sources-amended incubations at 0-hr and 90-day. We also submit the data showing variations of total organic carbon, bacterial abundance and fluorescent DOM in the control and different carbon sources-amended treatments throughout the 90-day incubation
