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Table III
Results of generalized linear models (GLMs), showing the best set of explanatory variables explaining sapling presence/absence as response variable for the south-facing juniper habitat (AS), the north-facing habitat (AN) and both habitats pooled, using AIC (Akaike information criterion) best set selection and Binominal distribution with logistic link function. Models explained 20.1%, 26.1% and 18.8%, respectively, of the total deviance.
| Parameter estimates | Model building results | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Afur South | Estimate | SE | Wald’s χ2 | p | AIC | p | |||
| Distance to nearest adult tree | 0.004 | 0.002 | 6.663 | 0.009 | 115.16 | < 0.0001 | |||
| Soil depth | -0.123 | 0.053 | 5.510 | 0.019 | |||||
| Shrub cover | –0.027 | 0.013 | 4.600 | 0.032 | |||||
| Afur North | |||||||||
| Distance to NAT | 0.003 | 0.001 | 7.112 | 0.007 | 95.76 | < 0.0001 | |||
| Cone density on the ground | –0.008 | 0.004 | 4.497 | 0.034 | |||||
| Shrub cover | –0.029 | 0.014 | 4.440 | 0.035 | |||||
| Bare soil | 0.033 | 0.016 | 4.069 | 0.044 | |||||
| Pooled data | |||||||||
| Distance to nearest adult tree | 0.003 | 0.001 | 16.338 | < 0.001 | 213.50 | < 0.0001 | |||
| Shrub cover | –0.024 | 0.009 | 7.388 | 0.007 | |||||
| Cone density on the ground | –0.006 | 0.003 | 4.450 | 0.035 | |||||
| Soil depth | –0.061 | 0.031 | 3.750 | 0.053 | |||||