Fig. 6

Phylogenetic tree colored by OTU occurrences in each size constructed with 1'224 of >40'000 OTUs found in water samples. Circle area represents the number of samples (both technical duplicates) in which an OTU was consistently exclusively appearing with either large bacteria (0.4 µm filter, red) or small bacteria (0.2 µm filtered after 0.4 µm filter, blue), with this number ranging from 1 to 16 samples. OTUs, which were at times exclusive to both sizes in a filter pair (non-exclusive) are marked in green. Extraneous OTU branches that never met these criteria (unclassifiable, eliminated) were removed from the figure. Several phyla and a class of interest are labeled. For more detailed phylogenetic identification, see Supplementary Figure S10a