Table 2. Most frequent significant variables resulting from nest-site selection in 16 cinereous vulture breeding colonies.

Variable	Type	Relation	nsignif	nstud	Proportion
Slope	Landscape	+	8	12	0.67
Tree diameter	Microhabitat	+	4	6	0.67
Scree presence	Landscape	+	2	3	0.67
Orientation south	Landscape	+	3	5	0.60
Distance to track	Anthropic	+	7	12	0.58
Cork oak cover	Landscape	+	3	6	0.50
Human population index	Anthropic	−	3	6	0.50
Holm oak cover	Landscape	−	3	6	0.50
Position on upper third of the slope	Landscape	+	2	4	0.50
Tree height	Microhabitat	+	3	7	0.43
Distance to road	Anthropic	+	5	12	0.42
Orientation east	Landscape	+	3	5	0.60
Distance to nearest nest	Others	+	2	5	0.40
Altitude	Landscape	+	6	16	0.37

Relation indicates the type of relationship (positive or negative) of the variable with the selection by the cinereous vulture; (n _signif) shows the number of colonies for which the variables was statistically significant; (n_stud) indicates the number of colonies in which the variable was studied, and Proportion shows the ratio of the two previous numbers (n₁/n₂). The table includes variables that were statistically significant more than once and in more than one third of the studied colonies.