TABLE 2.

Estimates of sampling coverage and θ_n (the unconditional probability of a new OTU discovery if another clone was taken) for each study site^a

Site	Sampling coverage (%)	θn	No. of clones obtained	No. of OTUs identified
Signy	92.31	0.0368	169	33
Rothera Point	89.74	0.0509	117	21
Mars Oasis	86.78	0.0673	121	32
Coal Nunatak	87.14	0.0714	140	48
Sky Hi Nunataks	93.59	0.0307	78	21
La Gorce	98.85	0.0135	87	10

^aSee Materials and Methods for detail of calculation.