TABLE 5.

Diversity comparisons between the six study sites

Site	Z value for comparison witha:
	Rothera	Mars Oasis	Coal Nunatak	Sky Hi	LaGorce
Signy	−0.476§	−3.756*	−4.246*	1.634§	4.191*
Rothera		−3.580*	−4.096*	2.636*	5.638*
Mars Oasis			−0.768§	6.957*	9.582*
Coal Nunatak				7.062*	9.347*
Sky Hi					9.958*

^aZ values were calculated from data normalized by rarefaction (see Materials and Methods). §, not significant; *, significant (P < 0.01).