Table 2. Relative contribution of the ten most important variables to extinction status of the whitebark pine based on the 2-way interaction boosted regression tree.

Variable	Relative contribution (%)	Type of variable
Total habitat amount	40.3	Habitat
Survival class 4	13.7	Demographic
Survival class 3	12.8	Demographic
Catastrophe intensity	8.9	Demographic
Mean carrying capacity	5.9	Habitat
Mean correlations	2.6	Demographic
Mean habitat suitability	1.8	Habitat
Mean dispersal rate	1.5	Demographic
Fecundity class 1	1.2	Demographic
No. of populations	1.1	Habitat