Table 2 Variable importance (0–1) for SDM of current Scots pine and downy oak distribution fitted by generalized linear model (GLM), artificial neural network (ANN), and multiple adaptive regression spline (MARS)
| Â | Scots pine | Downy oak | ||||
|---|---|---|---|---|---|---|
Variable | GLM | MARS | ANN | GLM | MARS | ANN |
AI | 0.650 | 0.645 | 0.733 | 0.848 | 0.830 | 1.000 |
Slope | 0.000 | 0.086 | 0.006 | 0.038 | 0.087 | 0.023 |
TPI | 0.145 | 0.162 | 0.000 | 0.099 | 0.103 | 0.000 |
Southness | 0.180 | 0.393 | 0.283 | 0.210 | 0.269 | 0.220 |
ATC | 0.000 | 0.017 | 0.000 | 0.078 | 0.042 | 0.000 |
AWC | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
DR | 0.000 | 0.000 | 0.000 | 0.251 | 0.138 | 0.000 |
ERO | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
OC | 0.000 | 0.000 | 0.000 | 0.044 | 0.000 | 0.000 |
VS | 0.000 | 0.000 | 0.000 | 0.160 | 0.000 | 0.000 |
Avalanches | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
Wildfires | 0.010 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
Erosion | 0.000 | 0.061 | 0.319 | 0.011 | 0.028 | 0.109 |
Depop | 0.069 | 0.029 | 0.000 | 0.027 | 0.041 | 0.000 |
Roads | 0.000 | 0.000 | 0.459 | 0.016 | 0.029 | 0.159 |
Buildings | 0.000 | 0.017 | 0.367 | 0.027 | 0.155 | 0.201 |
VCF | 0.000 | 0.028 | 0.018 | 0.000 | 0.024 | 0.023 |
NDVI | 0.134 | 0.093 | 0.000 | 0.006 | 0.074 | 0.000 |