Fig. S1. Rarefaction curves for each sample. The number of sequences in each unique OTU per subsample was used to calculate the rarefaction.

Fig. S2. Phylogenetic reconstruction of the SAR11 clade. DNA distance and neighbour joining method, bootstrap based on 1000 replicated trees. OTUs from this study are given in bold, with the number of sequences retrieved in parentheses.

Table S1. Microbial richness and diversity estimates. The calculations were based on randomly picked OTUs normalized to 3393 sequences per sample to accommodate for the lowest number of sequences found in a sample.


Table S2. SIMPER analysis showing the contribution of the OTUs to the differences between time points. (Supplied online as Excel file).

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