Table 2. Model selection results for predicting species richness according to migratory bird ratio, vertical (under, mid, overstory vegetation), and horizontal (habitat diversity) habitat heterogeneity.
Uninformative parameters (spring temperature) were removed from models.
| Response variables | Candidate models | AICc | ΔAICc | df | wi |
|---|---|---|---|---|---|
| Species richness (No. of species/0.8 ha) | (Best model, full model) intercept + OV + MV + UV + HD + MRs | 637.7 | 0.0 | 7 | 0.488 |
| Intercept + OV + MV + UV + HD | 638.9 | 1.2 | 6 | 0.264 | |
| Intercept + OV + MV + UV + MRs | 639.3 | 1.6 | 6 | 0.219 | |
| Intercept + OV + MV + UV | 643.4 | 5.6 | 5 | 0.029 | |
| Intercept + HD | 660.6 | 22.9 | 3 | <0.001 | |
| Intercept + MRs | 660.9 | 23.2 | 3 | <0.001 | |
| Intercept + HD + MRs | 662.5 | 24.8 | 4 | <0.001 |
Notes:
Coverage of UV, understory vegetation; MV, midstory vegetation; OV, overstory vegetation; ST, spring temperature; HD, habitat diversity; MRs, migratory bird ratio (species).