Ecological Archives E096-149-A9

Joseph A. LaManna, Amy B. Hemenway, Vanna Boccadori, and Thomas E. Martin. 2015. Bird species turnover is related to changing predation risk along a vegetation gradient. Ecology 96:16701680. http://dx.doi.org/10.1890/14-1333.1

Appendix I. Conifer removal effects on nest predation rates of bird species.

Table I1. Conifer removal effects on nest predation rates of bird species in western Montana, USA. For each species, the χ² statistic and corresponding p value from likelihood ratio tests, which tested the significance of a treatment-by-time (before/after conifer removal) interaction compared with a null model, are presented. Also presented are the estimated daily nest predation rates (DNPR) in treatment stands before and after conifer removal after correcting for changes in nest predation rates on control plots. This difference was then transformed into a percent difference (% Change ±1 SE). Sample size of nests for each species (n) is also provided. Significant effects (p < 0.05) are bolded and marginally significant effects (p < 0.10) are italicized. Bird species are ordered according to effect size of PC axes on density (see Appendix E).

Species

χ²

p value

DNPR Before

DNPR After

% Change

% Change SE

n

Mountain Chickadee

1.62

0.203

0.022

0.002

-89.0%

69.6%

50

Chipping Sparrow

2.57

0.109

0.013

0.038

66.0%

43.8%

33

Dark-eyed Junco

3.91

0.048

0.037

0.013

-64.4%

34.9%

54

Dusky Flycatcher

4.27

0.039

0.030

0.007

-77.9%

39.0%

106

Warbling Vireo

12.60

0.000

0.026

0.001

-96.5%

29.4%

185

American Robin

3.03

0.082

0.042

0.014

-67.4%

40.7%

124


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