Appendix B (Table B1). Model-averaged parameter estimates for three models explaining variation in species richness of forest birds, categorized into six foraging guilds, as a function of bird density, and time period of an outbreak of mountain pine beetles (pre- and outbreak), in British Columbia, 1997–2007. Density is expressed as ln(density + 0.05), and outbreak is expressed as the mean difference in ln(richness + 1) between the two time periods, where a positive number indicates more species in the pre-outbreak period than in the post-outbreak period.
Parameter Value
SE
t
Aerial insectivore
Intercept
1.56
0.06
26.83
Density
0.41
0.04
9.74
Outbreak
0.04
0.04
0.93
Bark insectivore
Intercept
1.80
0.06
32.46
Density
0.50
0.03
14.23
Outbreak
-0.07
0.04
-1.82
Foliage insectivore
Intercept
1.93
0.02
112.02
Density
0.41
0.03
14.05
Outbreak
-0.03
0.03
-1.03
Ground insectivore
Intercept
1.80
0.04
46.00
Density
0.36
0.04
9.99
Outbreak
0.06
0.03
1.91
Herbivore
Intercept
1.36
0.03
45.86
Density
0.30
0.03
11.10
Outbreak
0.04
0.04
1.07
Omnivore
Intercept
1.68
0.05
32.24
Density
0.54
0.02
26.12
Outbreak
0.00
0.02
0.10