Finally, the taxonomic composition was cross referenced with a phylogenetic tree in order to understand how bacterial groups compared to each other in terms of composition relatedness. From Fig. 3, we see that control and acetone samples are all more closely related to each other than the rest of the samples are, indicating a core microbiome present within the control and acetone oysters. Conversely, experimental samples that were exposed to atrazine are more closely related to each other, displaying far fewer relative abundance % for the genus Pseudoalteromonas, Clostridium, FUsobacterium and Vibrio than the control samples (Fig 1).