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Selected taxonomic groups and their distribution (in relative abundance) among the six size-fractions: SAR11, Synechococcus sp., Bacteroidetes, Planctomycetes, Verrucomicrobia, Actinobacteria, Alteromonadales, Rhodobacterales. Boxplots were constructed with the upper and lower lines corresponding to the first and third quartile of the distribution. The median values are shown with horizontal black wide lines. Outliers are displayed as dots.
