Frequencies of taxonomic grouped sequences in each dataset.

For each dataset the following data is provided: total number of sequences remaining after quality filtering and removal of chimeras and sequences that are too short (N), number of sequences identified as being of eukaryotic origin (Eukaryota), number of sequences identified as being of bacterial origin (Bacteria), number of sequences that could not truly be assigned (Unclassified) and proportion of unclassified sequences relative to the total number of sequences (U/N).