Fig. 3

Effects of PMA treatment on microbial communities from the Boston MBTA transit environment. a Relative abundances of 15 taxa with the highest means across four BE sample types with and without PMA treatment. Each column represents a biological replicate. b Bray-Curtis dissimilarity distributions between MBTA samples with and without PMA treatment. Columns labeled with the sample type alone (e.g., seat) show distances within that PMA-free group; “type(PMA)” (e.g., seat(PMA)) shows distances within the PMA-treated group, and “type(between)” (e.g., seat(between)) those between paired samples with and without PMA treatment. c Principle coordinate analysis of MBTA samples using Bray-Curtis distances among filtered OTUs. Sample type and PMA treatment are both major drivers of overall community composition as expected