Table 2.
Summary of the mixed models for the analysis of the concentration of non-volatile resin, soluble sugars, and starch in the stems of young pine trees as affected by the main effects light on plant, light on insect, pine population and herbivory, and their interactions.
| Non-volatile resin | Soluble sugars | Starch | ||||||
|---|---|---|---|---|---|---|---|---|
| Effect | DF | F | p > F | F | p > F | F | p > F | |
| Light on plant (LP) | 1,77 | 0.6 | 0.426 | 11.9 | 0.001 | 2.5 | 0.122 | |
| Light on insect (LI) | 1,77 | 9.1 | 0.003 | 0.0 | 0.916 | 0.0 | 0.914 | |
| LP × LI | 1,77 | 2.2 | 0.144 | 1.2 | 0.274 | 0.4 | 0.510 | |
| Herbivory (Herb) | 1,77 | 90.2 | <0.001 | 4.6 | 0.036 | 0.4 | 0.550 | |
| LP × Herb | 1,77 | 0.5 | 0.487 | 3.5 | 0.066 | 0.5 | 0.492 | |
| LI × Herb | 1,77 | 5.9 | 0.018 | 0.6 | 0.440 | 0.2 | 0.627 | |
| LP × LI × Herb | 1,77 | 0.2 | 0.626 | 1.8 | 0.188 | 0.6 | 0.440 | |
| Pine population (Pop) | 2,77 | 3.6 | 0.032 | 7.5 | 0.001 | 3.5 | 0.035 | |
| LP × Pop | 2,77 | 1.0 | 0.387 | 2.6 | 0.079 | 1.8 | 0.166 | |
| LI × Pop | 2,77 | 0.9 | 0.418 | 1.5 | 0.226 | 0.6 | 0.547 | |
| LP × LI × Pop | 2,77 | 1.8 | 0.180 | 0.5 | 0.640 | 0.3 | 0.777 | |
| Pop × Herb | 2,77 | 3.3 | 0.042 | 2.2 | 0.121 | 1.0 | 0.389 | |
| LP × Pop × Herb | 2,77 | 1.6 | 0.203 | 0.4 | 0.656 | 2.8 | 0.065 | |
| LI × Pop × Herb | 2,77 | 0.7 | 0.499 | 3.6 | 0.032 | 0.3 | 0.735 | |
| LP × LI × Pop × Herb | 2,77 | 0.3 | 0.738 | 0.9 | 0.415 | 0.2 | 0.792 | |
Resin was analyzed in the experimental part of the stem exposed to the weevil; sugars were analyzed in the basal part of the stem. Degrees of freedom (DF), F ratios, and associated probability levels are shown. Significant effects (p < 0.05) are highlighted in bold font.