Table 2. Summary of averaged diversity measurements for each treatment group rarefied at 10,918 reads.

	Number of OTUs	Chao1	Shannon
Control Intake	1101	1764	7.226
	(199)	(354)	(0.300)
NaOH Intake	907	1457	6.761
	(152)	(265)	(0.292)
Control Discharge	1302	2101	7.873
	(69)	(158)	(0.132)
NaOH Discharge	403	670	2.971
	(92)	(159)	(0.813)
NaOH Discharge vs. Control Discharge	p<0.001	p<0.001	p<0.001
NaOH Intake vs. NaOH Discharge	p<0.001	p<0.001	p<0.001
Control Intake vs. Control Discharge	p = 0.007	p = 0.011	p = 0.010
Control Intake vs. Control Discharge (HSD)	p = 0.032	p = 0.051	p = 0.045

The numbers inside the parentheses represent the standard deviation. The bottom half shows results from a statistical test comparing treatment groups of interest for each diversity index.