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Table 1 Fitted coefficients, the standard errors, P values of the generalized linear mixed-model for probability of W. cedarbergensis mortality across all regions (model 1) and in natural stands (model 3), probability of recruitment across all regions (model 2) and the Wald test of fixed effects

From: Collapse of an iconic conifer: long-term changes in the demography of Widdringtonia cedarbergensis using repeat photography

Predictors Model 1 Model 2 Model 3
Estimate S.E. Estimate S.E. Estimate S.E.
(a)
 Intercept –9.14* 2.85 9.23 5.72 –9.96* 4.40
 Habitat-open 0.39 0.45 1.19 0.76 0.41 0.61
 Habitat-rocky 0.26 0.23 0.38 0.50 0.55* 0.27
 Aspect-north 1.45*** 0.41 0.00 0.82 1.99*** 0.45
 Aspect-south 0.49 0.30 0.15 0.69 1.24*** 0.34
 Aspect-west 0.89** 0.33 0.78 0.63 1.43*** 0.41
 Fire frequency 0.09 0.12 –0.18 0.23 0.30* 0.14
 MAT 0.70** 0.23 –0.96* 0.47 0.64 0.36
 Random effects (R.E.) 0.00 0.97 0.00 0.98 1.02 0.90
Predictors Χ2 p value Χ2 p value Χ2 p value
(b)
 Habitat 18.6 0.000 2.5 0.290 9.0 0.029
 Aspect 18.8 0.000 8.7 0.068 26.9 0.000
 Fire frequency 0.5 0.468 0.6 0.440 4.6 0.033
 MAT 9.6 0.002 4.2 0.041 3.2 0.073
  1. R.E.: nregion = 4; nsite = 86, R.E.: nregion = 4; nsite = 86, R.E.: nregion = 3, nsite = 80, ntree = 1313, ntree = 1357, ntree = 821
  2. Habitat well protected and aspect–east set as intercept, MAT Mean annual temperature
  3. p values: 1 < 0.10, * < 0.05, ** < 0.01, *** < 0.001
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BMC Ecology

ISSN: 1472-6785

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