Table 2. Diversity metrics for the total sampled environments, using 16S rDNA V4 region sequences clustered at similarity level of 0.97 and normalized to 1,800 sequences per sample.

Description	Seqs/Sample	Chao1	Dominance	Equitability	Observed species	Shannon	Simpson
NLM	1800	486	0.03	0.79	317	6.58	0.97
PM	1800	514	0.01	0.86	363	7.33	0.99
BM	1800	358	0.02	0.85	273	6.91	0.98
RAC	1800	416	0.05	0.76	275	6.15	0.95