Table 3.
Model selection table for the top soil-based predictors of aphid growth across 20 organically managed farm soils (Bacillus spp. relative abundance, Pseudomonas spp. relative abundance, bacterial community evenness, NH4, percent organic matter, and pH).
| Model | (Intercept) | Bacillus spp. | Pseudomonas spp. | Bacterial community evenness | NH4 | % Organic matter | pH | AICc | Delta | Weight |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 191.60 | 72.28 | 1667 | –127.7 | –11.06 | 276.3 | 0 | 0.263 | ||
| 2 | 178.30 | 77.66 | 1772 | –116 | 1.365 | –11.6 | 276.4 | 0.13 | 0.246 | |
| 3 | 194.60 | 71.78 | 1834 | –129.4 | –0.21 | –11.53 | 278.4 | 2.16 | 0.089 | |
| 4 | 178.50 | 77.62 | 1780 | –116.1 | –0.01 | 1.36 | –11.63 | 278.8 | 2.57 | 0.073 |
| 5 | 20.25 | 1709 | 333.6 | 26.13 | 0 | |||||
| 7 | 29.92 | 133.60 | 342.2 | 34.75 | 0 | |||||
| 8 | 9.619 | 26.67 | 342.9 | 35.43 | 0 | |||||
| 9 | 73.45 | –6.11 | 349 | 41.48 | 0 | |||||
| 10 | 33.82 | 352.9 | 45.45 | 0 |
Delta indicates the difference in AICc from the best-fit model, and AICc weights represent the likelihood of the model relative to competing ones. Retained best-fit model is shaded gray, and factors that were not retained in any of the top five candidate models were eliminated from tables. Models 5–10 are single-parameter and intercept-only models for reference. Original global model included the following factors: concentrations of nitrate-N, ammonium-N, plant available P, K, SO4, pH, organic matter, Bacillus spp. relative abundance, Pseudomonas spp. relative abundance, microbial community evenness, and microbial biomass (mg/kg soil).