Table 2.
List of environmental predictor variables included in the CWM-RDA and regression analysis. For more detailed description of the variables, see Nilsson et al. (1988)
| Environmental predictor variables | Range | Source |
|---|---|---|
| Island area [ha] | 0.6–74.3 | (Nilsson et al. 1988) |
| Distance to the mainland [m] | 200–4050 | (Nilsson et al. 1988) |
| Distance to the next largest island [m] | 50–1650 | (Nilsson et al. 1988) |
| Average tree cover [%]1 | 64.4–97.5 | (Nilsson et al. 1988) |
| Woody plant richness | 19–23 | (Nilsson et al. 1988) |
| Number of habitats per island2 | 2–7 | (Nilsson et al. 1988) |
| Mean basal area of deciduous trees (BADT) [% of living basal area] | 53.65–98.87 | (Nilsson et al. 1988) |
| Productivity of ground vegetation3 | 0–14.70 | (Nilsson et al. 1988) |
| Wetness index of ground vegetation3 | 0–29.70 | (Nilsson et al. 1988) |
| Leaf dry matter content (LDMC) [mg/g] | 259.7–312.1 | |
| Esker ridge | 0 or 1 |
1
Tree cover was estimated for each island as the mean vertical projection of the canopy (see Nilsson et al. 1988).
2
From the 19 habitat types that were previously determined by Nilsson et al. (1988).
3
Mean of the number of indicator species found in the plant sampling square divided by the total number of species in the square (Nilsson et al. 1988).