Table 3.

The percentage contribution of ten climatic variables for X. italicum based on Jackknife tests.

Variable	Contribution (%)
(Bio1) Annual mean temperature	65.3
(Bio2) Mean diurnal range	11.2
(Bio4) Temperature seasonality	9.0
(Bio12) Annual precipitation	7.7
(Bio19) Precipitation of coldest quarter	2.7
(Bio9) Mean temperature of driest quarter	1.7
(Bio18) Precipitation of warmest quarter	1.5
(Bio17) Precipitation of driest quarter	0.5
(Bio8) Mean temperature of wettest quarter	0.4
(Bio15) Precipitation seasonality	0