Table 4.
Performance indicators of the best generalized additive models (highest deviance explained, no correlated variables) describing the abundance of Ornduffia calthifolia and O. marchantii
| d.f. | P-value | Deviance explained (%) | Adjusted r2 | |
|---|---|---|---|---|
| Ornduffia calthifolia | ||||
| Best model: AbOC ∼ s(S) + s(Ia) + s(A) + s(C) + s(E) | ||||
| Model overall | 47·8 | 0·492 | ||
| Elevation (E) | 5·71 | 7·8 × 10–7 | ||
| Insolation (Ia) | 1·00 | 5·7 × 10–10 | ||
| Curvature (C) | 4·49 | 0·06 | ||
| Soil depth (S) | 3·21 | 3·5 × 10–7 | ||
| Ornduffia marchantii | ||||
| Best model: AbOM ∼ s(A) + s(V) | ||||
| Model overall | 46·0 | 0·383 | ||
| Vegetation height (H) | 3·75 | 9·7 × 10–4 | ||
| Aspect (A) | 8·66 | 2·1 × 10–9 | ||