Fig. 1.

Phylogenetic assignments and relative frequencies of the rDNA sequences from indigenous eukaryotic community, and the labelled and unlabelled rRNA fractions in the experimental treatments. A. rDNA extracted from the total community. B. Unlabelled fractions from the density gradient separations and time 0 samples. C. Samples with label originating from Prochlorococcus or Synechococcus added to the experimental bottles. Error bars represent the standard deviation of the values obtained for the biological duplicates of the libraries. Phylogenetic assignment follows Adl and colleagues (2005) with classification at the first- (in bold) and second-rank taxonomic level except when indicated as follows: *Super-groups, **Phylum, ***third-rank taxonomic level and ****novel Alveolate groups I and II (NAI and NAII), or the novel MAST following Not and colleagues (2007).