Table 1.

Salinity, sample size, subsampled inverse Simpson index, and inverse Simpson index for amplicon data sets^a

Sample	Salinity (g/liter)	No. of sequences	Subsampled inverse Simpson index			Inverse Simpson index
			0.03 (strain)	0.05 (species)	0.1 (genus)	0.03 (strain)	0.05 (species)	0.1 (genus)
June 1992	249	12,733	7.45 ± 0.56	7.31 ± 0.56	6.36 ± 0.38	7.46 ± 0.20	7.33 ± 0.19	6.37 ± 0.13
September 1992	288	8,904	5.58 ± 0.30	5.43 ± 0.30	4.22 ± 0.18	5.59 ± 0.13	5.45 ± 0.13	4.22 ± 0.08
March 2007	347	25,471	10.90 ± 0.70	9.20 ± 0.54	4.09 ± 0.22	10.98 ± 0.17	9.24 ± 0.13	4.10 ± 0.05
Pool 1	287	3,188	2.97 ± 0.18	2.92 ± 0.18	2.67 ± 0.12	2.97 ± 0.15	2.92 ± 0.15	2.67 ± 0.11
Pool 2	279	1,452	4.82 ± 0.08	4.78 ± 0.08	4.06 ± 0.04	4.83 ± 0.41	4.79 ± 0.40	4.07 ± 0.25
Pool 9	225	4,655	3.90 ± 0.18	3.82 ± 0.18	3.42 ± 0.14	3.91 ± 0.12	3.82 ± 0.12	3.42 ± 0.09
Pool 10	261	17,693	2.63 ± 0.20	2.61 ± 0.18	2.03 ± 0.12	2.63 ± 0.06	2.62 ± 0.06	2.02 ± 0.04

^aThe values were calculated at the 3% , 5%, and 10% levels, which we approximate as the strain, species, and genus levels for the primarily hypervariable portions of the 16S rRNA gene that we sequenced. Ninety-five percent confidence intervals are provided for both the subsampled inverse Simpson index and the inverse Simpson index.