Table 1.

Pearson correlation coefficients between the different explanatory variables: ART - percentage of cover of artificial areas, FOR – percentage of cover of forest and natural and semi-natural territories, AGR - percentage of cover of agriculture and agro-foresty areas, WET – percentage of cover of wetland territories, ROADS – density of roads, PATH – density of paths and footpaths, POP_LOG – logarithm of human population density, ALT – altitude.

Explanatory variables	ART	FOR	AGR	WET	ROADS	PATH	POP_LOG	ALT
ART	1.00
FOR	−0.20	1.00
AGR	−0.15	−0.89	1.00
WET	0.07	−0.13	−0.07	1.00
ROADS	0.80	−0.10	−0.15	−0.00	1.00
PATH	0.46	0.02	−0.20	0.03	0.40	1.00
POP_LOG	0.71	−0.09	−0.17	0.14	0.68	0.27	1.00
ALT	−0.26	0.37	−0.23	−0.14	−0.13	−0.11	−0.16	1.00