Table 1.
Comparison of alternative models (using AICc) for earthworms (richness...spp. m−2, density...ind. m−2, biomass...g m−2) and litter decomposition (S value…stabilisation index, k…decomposition rate) in vineyards.
| Fixed effect | Random effect | Earthworms, total | Anecic Earthworms | Endogeic Earthworms | Litter decompostion | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Richness | Density | Biomass | Richness | Density | Richness | Density | S value | k value | ||
| No | Yes | 314.0 | 510.0 | 477.0 | 163.6 | 230.4 | 263.0 | 445.8 | −134.1 | 126.0 |
| Management intensity | Yes | 311.6 | 510.8 | 476.2 | 162.9 | 230.0 | 260.5 | 446.5 | −132.3 | 127.8 |
| Soil quality | Yes | 312.4 | 510.1 | 476.3 | 163.0 | 229.4 | 261.3 | 445.8 | −133.0 | 126.7 |
| Managem. intens. × Plant biomass | No | 304.2 | 713.2 | 489.6 | 161.9 | 278.6 | 243.7 | 569.5 | −142.0 | 117.7 |
| Soil quality + Plant biomass | No | 297.2 | 669.1 | 474.7 | 155.8 | 241.0 | 244.5 | 571.6 | −139.6 | 116.4 |
| Soil quality × Plant biomass | No | 299.4 | 671.0 | 477.0 | 153.3 | 235.9 | 245.9 | 573.7 | −137.7 | 117.0 |
| Plant biomass | Yes | 300.3 | 496.0 | 451.4 | 160.5 | 227.9 | 251.5 | 433.1 | −157.3 | 112.0 |
| Managem. intens. + Plant biomass | Yes | 297.6 | 497.4 | 450.6 | 159.8 | 227.7 | 249.2 | 434.4 | −155.5 | 114.0 |
| Managem. intens. × Plant biomass | Yes | 298.1 | 498.6 | 452.9 | 161.7 | 229.9 | 246.0 | 435.0 | −155.5 | 115.3 |
| Soil quality + Plant biomass | Yes | 293.7 | 493.0 | 447.0 | 156.7 | 223.1 | 246.4 | 430.5 | −155.7 | 112.9 |
| Soil quality × Plant biomass | Yes | 295.9 | 495.1 | 449.3 | 155.5 | 223.6 | 247.9 | 432.7 | −153.6 | 114.6 |
| Mean patch size (MPS) | Yes | 315.4 | 509.2 | 475.9 | 164.9 | 231.4 | 264.2 | 444.8 | −132.0 | 128.2 |
| Managem. intens. + MPS | Yes | 313.1 | 510.1 | 475.0 | 164.1 | 230.8 | 261.8 | 445.5 | −130.2 | 130.0 |
| Managem. intens. × MPS | Yes | 312.9 | 510.1 | 476.5 | 159.4 | 227.4 | 263.5 | 446.4 | −128.2 | 131.7 |
| Soil quality + MPS | Yes | 313.2 | 507.9 | 472.3 | 163.9 | 229.7 | 261.8 | 443.1 | −130.8 | 128.8 |
| Soil quality × MPS | Yes | 313.9 | 509.4 | 474.4 | 166.0 | 231.8 | 261.4 | 444.8 | −131.5 | 130.9 |
| R2 adjusted | 0.29 | 0.31 | ||||||||
| R2marginal | 0.27 | 0.30 | 0.26 | 0.33 | 0.22 | 0.08 | 0.06 | |||
| R2conditional | 0.41 | 0.79 | 0.55 | 0.60 | 0.75 | 0.26 | 0.19 | |||
The best models (lowest AICc and ∆AICc ≤ 2) are indicated in boldface type. R2 refers to the best models. For clarity, only the most parsimonious (i.e., lowest AICc) of all possible models are presented. Random effect indicates whether the individual vineyard was included or not.