Relative abundance of major bacterial families in P30 and NP30 communities. Relative abundance was estimated using the ContigEval analysis pipeline. Height of the colored boxes represents a number of identities in all contigs assigned to a given taxon related to a number of identities in all contigs assigned to all taxa. The boxes are clustered by class. Names associated with each color are provided that list Class, Order, and Family. For each culture, only the most abundant families contributing to the 90% of cumulative percentage are shown. An alternative representation in which they are ordered by taxon abundance averaged for P30 and NP30 cultures is provided as Additional file 4.