Table 2.Parameter estimates from a general linear model (logit link, binomial errors) assessing whether population declines in aerial insectivorous passerines (24 species) differed from other passerines (186 species). The model assessed the effect of latitude, longitude, and assemblage (‘aerial insectivore’ or ‘other’) on the odds of species declining (number of species with trend < 0 vs. number of species with trend ≥ 0) within each of 58 North American jurisdictions (states and provinces).


Parameter Estimate SE Z p
Assemblage
-0.661
0.697
-0.95
0.342
Latitude
-0.039
0.013
-2.96
0.003
Longitude
0.020
0.005
4.27
<0.001
Assemblage × latitude
0.047
0.014
3.30
0.001
Assemblage × longitude
-0.014
0.005
-2.68
0.007