Table 2.

The total number of nifH sequences, OTUs (binned at 95% similarity) and sequence distribution between cyanobacteria and heterotroph lineages (calculated as a % of total sequences) for samples collected in 2014 from Taylor Valley. Chao–Shen index estimated the number of additional OTUs generated by obtaining an additional 250 sequences.

Sample ID	Total sequences	OTUs	Cyanobacteria (%)	Heterotrophs (%)	Chao–Shen index
1.1	768	23	0.26	99.7	2.229
1.2	618	19	21.5	78.5	1.254
2.1	19826	67	49.2	50.8	0.050
2.2	2731	26	89.0	11.0	0.819
3.1	7408	33	90.9	9.1	0.130
3.2	6308	25	93.5	6.5	0.272
7.1	555	13	73.3	26.7	2.052
7.2	19463	24	51.2	48.8	0.025
8.1	9013	25	99.1	0.89	0.082
8.2	13939	17	99.8	0.20	0.053
9.1	2091	20	99.2	0.76	0.675
9.2	258	13	90.4	9.6	Failed
10.1	4253	38	70.4	29.6	0.113
10.2	4300	26	57.6	42.4	0.168
11.1	1020	13	99.6	0.39	0.635
11.2	3104	17	98.5	1.48	0.150
12.1	561	14	98.6	1.43	2.045
12.2	41121	26	99.96	0.041	0.012