Table 1. Average and range (in parenthesis) of sequence numbers, diversity, and evenness in the aquifer, and soil samples.

Sample type	Number of samples	Number of sequences	Richness	Diversity		Evenness
			OTUs per sample	Shannon’s (H)	Fisher α	J
Basal and dike	37	1751074	2071	5.37	468.9	0.71
			(185–4373)	(2.13–6.95)	(23.1–1257.2)	(0.41–0.85)
Basal	30	1413545	1956	5.33	424.8	0.71
			(185–4374)	(2.13–6.95)	(23.1–1257.2)	(0.41–0.85)
Dike	7	337529	2561	5.51	657.6	0.71
			(991–3274)	(3.51–6.31)	(196.5–706.0)	(0.48–0.80)
Soil	32	1407413	2397	5.98	571.6	0.78
			(190–3937)	(2.72–6.89)	(34.1–956.8)	(0.51–0.87)