Table 4.

Results of randomization tests. Values in the table are Z values, where Z > 1.96 (bold) indicates significant positive deviation in the community aridity index compared with a random null model. The random null model consisted of sampling VT present globally, or present in the continent or biogeographic realm corresponding to the sample location.

Scale	ARG	AUS	ISR	KAZ	SAU	USA
All VT	1.560	1.337	1.612	1.551	−0.406	−0.331
Continent VT	3.217	3.088	2.970	2.427	−0.554	−0.166
Realm VT	3.251	3.180	1.254	1.417	−0.447	−0.152