Ecological Archives E090-071-A2

Mark C. Drever, Jacob R. Goheen, and Kathy Martin. 2009. Species–energy theory, pulsed resources, and regulation of avian richness during a mountain pine beetle outbreak. Ecology 90:1095–1105.

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



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