There is an error in the third sentence of the “16S library preparation” subsection of the Materials and Methods. The first primer listed is incorrect. The correct sentence is: The V6 region was amplified with custom barcoded primers that consist of a region that anneals to the V6 region of interest, followed by a unique five basepair barcode, and the Illumina sequencing adapter [44]:V6-L [5’- ACACTCTTTCCCTACACGACGCTCTTCCGATCTnnnnnCWACGCGARGAACCTTACC-3’]V6-R [5’-CGGTCTCGGCATTCCTGCTGAACCGCTCTTCCGATCTnnnnnACRACACGAGCTGACGAC-3’]