Table 5.

Statistical indicators for sulfamethoxazole (SMX) exposure.

	3%			20%
	Run 1	Run 3	Run 4	Run 1	Run 3	Run 4
No. of OTUs	288	338	289	42	35	41
Singleton	168	206	169	14	14	13
Chao1 richness estimator	647.7	807.2	619.1	55.0	65.3	52.1
ACE richness estimator	1,019.5	1,278.6	1,058.1	66.9	78.2	56.4
Shannon diversity index (H)	3.0	3.6	3.6	1.6	1.5	1.6
Evenness	0.53	0.62	0.63	0.41	0.41	0.43
Good’s coverage (%)	41.67	39.05	41.52	66.67	60.00	68.29

OTUs, operational taxonomic units.