Table 3.
Model selection statistics for the analysis of the effects of GDD>0°C during the year before sampling, nitrogen deposition, their interaction the, bedrock type, cone density, shrub height and needle loss on the ripening time of the seeds
| Intercept | Growing degree-days (GDD) year before sampling | Nitrogen deposition | GDD:ND | Bedrock type | Infection rate with M. bipunctatus | Cone density | Shrub height | Needle loss | d.f. | ΔAICc | Weight |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 6·18 | –2·29 × 10−3 | –0·553 | 1·06 × 10−4 | + | 15·8 | + | + | + | 15 | 0 | 0·22 |
| 2·14 | –1·20 × 10−3 | –0·156 | + | 17·5 | + | + | + | 14 | 0·11 | 0·21 | |
| 3·17 | –1·47 × 10−3 | –0·132 | 23·0 | + | + | + | 13 | 1·08 | 0·13 | ||
| 8·24 | –2·69 × 10−3 | –0·714 | 1·43 × 10−4 | + | + | + | + | 14 | 1·15 | 0·13 | |
| 7·27 | –2·56 × 10−3 | –0·518 | 1·03 × 10−4 | 20·0 | + | + | + | 14 | 1·22 | 0·12 | |
| –1·91 | –0·188 | + | 19·6 | + | + | + | 13 | 1·64 | 0·10 | ||
| 2·84 | –1·21 × 10−3 | –0·184 | + | + | + | + | 13 | 2·67 | 0·06 | ||
| –1·15 | –0·218 | + | + | + | + | 12 | 3·99 | 0·03 | |||
| Importance | 0·87 | 1 | 0·47 | 1 | 0·78 | 1 | 1 | 1 | – | – | – |
+, a factorial variable is included in the model.
ΔAICc, difference in values of the corrected Akaike Information Criterion between a model and the best model; weight, Akaike weight indicating the relative support for the model; importance, the relative importance of the explanatory variables based on the sum of the Akaike weights of the models in which the variables appear.