Table 2. Linear models for effects of elevation (as a proxy for temperature) and species richness on average ant worker abundance at 41 Central American forest sites.

Model	I	R	E	R*E	p	r2	AICc
All sites
Richness	1.01	0.0089			***	0.56	34.42
Elevation	2.16		−0.0005		***	0.59	31.81
Richness + Elevation	1.68	0.0039	−0.0003		***	0.61	31.53
Richness + Elevation + (Richness*Elevation)	2.24	−0.0032	−0.0007	7.76E-6	***	0.72	18.57
Ten highest sites
Richness	0.19	0.0563			*	0.45	12.90
Elevation					n.s.	0.28	15.47
Richness + Elevation					n.s.	0.39	18.44

Species richness is the number of species in 100 samples, using a taxon subset of identified ants (see text). Coefficient estimates have column headings I, R, E, R*E for intercept, richness, elevation, and interaction, respectively.