Primer Primer pair Sequence 5’ – 3’ XB1 762bp forward CAGACTCCTACGGGGAGGCAGCAGT PSR 762bp reverse ACTTAACCCAACATCTCACGACAC PSL 598bp forward AGGATTAGATACCCTGGTAGTCCA XB4 598bp reverse GTGTGTACAAGGCCCGGGAAC

Table 1: Forward and reverse primer pairs for the short-fragment 16S rRNA PCR.