Swift Foxes and Ideal Free Distribution: Relative Influence of Vegetation and Rodent Prey Base on Swift Fox Survival, Density, and Home Range Size

Table 4

Results of stepwise regression analysis of (a) vegetation structure variables and (b) prey base variables against home range size for swift foxes in southeastern Colorado, 2001–2004.Italics indicate a negative relationship.

(a)  

Spatial scale	Temporal scale	Primary variable	Partial 𝑅^2	Secondary variable	Partial 𝑅^2	Model 𝑅^2	Model 𝑃
Individual	Annual	Shrub density	0.044	None		0.044	0.085
	Dispersal	SD (% basal area)	0.121	None		0.121	0.040
	Pup-rearing	SD (mean shrub ht)	0.142	None		0.142	0.028
	Breeding	SD (mean shrub ht)	0.284	None		0.284	0.002
Population	Annual	Shrub density	0.172	Mean grass ht	0.129	0.301	0.025
	Dispersal	(no variables entered the model)
	Pup-rearing	(no variables entered the model)
	Breeding	Shrub density	0.393	None		0.393	0.039

(b)   

Spatial; scale	Temporal scale	Primary; variable	Partial 𝑅^2	Secondary variable	Partial 𝑅^2	Model 𝑅^2	Model 𝑃
Individual	Annual	N.grasshopper mouse captures	0.086	Deer mouse captures	0.052	0.137	0.056
	Dispersal	N.grasshopper mouse captures	0.143	Deer mouse captures	0.138	0.281	0.025
	Pup-rearing	Mean per capita biomass	0.107	None		0.107	0.068
	Breeding	deer mouse captures	0.181	None		0.181	0.043
Population	Annual	N.grasshopper mouse capture	0.105	Total captures	0.264	0.369	0.001
	Dispersal	(no variables entered the model)
	Pup-rearing	(no variables entered the model)
	Breeding	N.grasshopper mouse captures	0.467	Community richness	0.179	0.646	0.078