Fig. 5.

Comparison of the ten most abundant OTUs in control bath toy biofilms classified on family level. The inner circle represents bath toys used with clean water prior to bathing (clean water controls). The outer circle shows their composition in bath toys used with water after bathing (dirty water controls). Asterisks highlight the OTUs (in bold) that were abundant in both clean and dirty water controls. Each section of the plot represents the average relative abundance with the highest number of reads from triplicate bath toys. The portion of remaining OTUs is shown to emphasize the dominance of the ten most abundant OTUs for both clean and dirty water controls. OTUs are listed on family level as lowest common classification level, whereas “NA” represents OTUs that could only be classified on higher levels: NA¹—Class of TM7-3, NA²—Order of Phycisphaerales. For further descriptions on the OTUs’ origins see Table S5