Table 1B.

Diversity estimates from 16S rRNA amplicon libraries: clone sequences.

Sample	Clones	Nobs	Singletons	Chao1∗	Shannon	Simpson evenness	Equitability
Trap	63	13	6	20 (14–55)	2.52	0.113	0.70
Day 4E	55	20	9	26 (21–47)	3.75	0.056	0.87
Day 9E	56	13	7	24 (15–67)	2.91	0.094	0.79
Day 13E	50	17	8	26 (19–62)	5.10	0.066	0.88
Day 76E	59	25	15	60 (35–151)	3.59	0.044	0.87
Day 293E	53	38	27	82 (54–155)	4.05	0.027	0.97
Basalt	64	27	19	70 (40–166)	3.24	0.041	0.83
Day 9C	51	12	7	17 (13–40)	2.97	0.154	0.56
Day 13C	46	15	8	24 (17–60)	3.97	0.079	0.83
Day 283C	57	15	9	27 (18–69)	2.01	0.082	0.76

^∗The ranges shown are 95% confidence intervals.