Table 1.

Global minimum adequate models (MAMs) of mammal extinction risk, using phylogenetically independent contrasts. (Model with no taxon or region interaction terms: $R_{\text{adj}}^2=0.273$, d.f.=302. This model includes 372 species; there are fewer degrees of freedom than this because multispecies polytomies contribute a single degree of freedom each to the model. Model including terms from the MAM plus a taxon–HPD interaction: $R_{\text{adj}}^2=0.282$, d.f.=277. Note that this model excludes nine between-taxon contrasts that are included in the MAM. Model including terms from the MAM plus region–population density and region–geographical range size interactions: $R_{\text{adj}}^2=0.262$, d.f.=206. Degrees of freedom are lower for this model because it excludes species found across multiple regions. ^#p≤0.05; ^*p≤0.1; ^**p≤0.01; ^***p≤0.001; HPD=5th percentile value of human population density within a species' distribution.)

	no taxon or region interactions	taxon interaction		region interaction
predictor	t value	F value	partial R2	F value	partial R2
weaning age	2.26#	6.87**	0.018	20.46***	0.068
home range size	4.02***	1.2	0.003	4.63#	0.015
population density	−1.83*	0.39	0.001	0.06	0.0002
population density2	2.17#	10.08**	0.024	7.33**	0.024
geographical range size	−3.23**	63.2***	0.151	39.57***	0.131
HPD	4.35***	1.5	0.004	0.02	0.0001
HPD2	−3.9***	1.7	0.004	2.1	0.007
geographical range size–HPD	−3.39***	15.4***	0.04	0.99	0.003
population density–HPD	−2.9**	0.59	0.001	0.47	0.002
taxon–HPD		5.47***	0.068
region–population density				2.63#	0.035
region–geographical range size				2.55#	0.034