Table 2.

Read data for each environment.

	Cryoconite	Glacial ice	Lake	Lake ice	Sea ice	Seawater	Sediment	Snow	Soil	Subglacial lake
Number of samples	168	9	287	9	69	218	270	13	508	21
Number of final reads × 106	2.837392	1.403345	13.164907	1.151896	0.594581	47.326081	16.22292	4.721608	70.63853	5.210974
Number of final reads, Bacteria × 106	2.836965	1.40178	13.128534	1.151896	0.594535	47.317886	15.04291	4.720207	42.30966	5.114157
Number of final reads, Archaea × 106	0.000427	0.001565	0.036373	0	0.000046	0.008195	1.180008	0.001401	28.32887	0.096817
Number of normalized reads, Bacteria × 106	1.170712	0.409695	6.27037	0.52973	0.376019	25.230212	7.973523	1.67086	23.810962	2.789416
Number of normalized reads, Archaea × 106	0.00035	0.000917	0.030706	0	0.000038	0.007419	1.117945	0.0013	27.794788	0.093139
Number of unique reads, Bacteria	133351	2073	40711	598	7711	36955	152348	40405	514020	14826
Number of unique reads, Archaea	28	10	63	NA	2	30	6154	14	49669	254
Mean map ratio, Bacteria	0.88	0.91	0.86	0.91	0.87	0.80	0.90	0.86	0.87	0.90
Mean map ratio, Archaea	NA	0.48	0.93	NA	NA	0.86	0.83	0.50	0.83	0.85