Table 2.
Sparse PCs retained in the best ABT model of relative spread rate
| Explanatory variable | PC4 | PC1 | PC6 | PC2 |
|---|---|---|---|---|
| Present in Britain | −0.003 | −0.645 | 0.016 | |
| Global economic use | −0.098 | 0.161 | ||
| Naturalization date | 0.555 | |||
| Commercial agriculture use | −0.212 | 0.116 | 0.144 | |
| Compatible Rhizobium | −0.273 | 0.159 | ||
| Seed-contaminant frequency | −0.569 | |||
| Cultivated habitats (NZ) | −0.351 | |||
| Native-range area | 0.386 | |||
| Conditions tolerated | 0.477 | −0.318 | ||
| New Zealand climate match | 0.394 | 0.050 | ||
| Urban/rural habitats | −0.298 | 0.365 | ||
| Elevation of native range | 0.207 | 0.058 | ||
| Native canopy cover | −0.350 | −0.131 | −0.195 | |
| Life span | 0.243 | |||
| Vegetative reproduction | 0.458 | |||
| Self-pollination capable | 0.424 | |||
| Corolla length | 0.051 | 0.140 | 0.618 | |
| Seed size | 0.369 | |||
| Long-distance dispersal | −0.352 | −0.043 | 0.134 | |
| Seed shape like T. repens | 0.137 | 0.125 | ||
| Polyploidy | −0.104 | 0.124 | ||
| Reduced chromosome number | 0.070 | |||
| Maximum height | 0.328 | |||
| Habit | 0.286 | 0.032 | ||
| Flowering time (native) | ||||
| Flowering length (native) | 0.251 | −0.149 | −0.025 | |
| Flowering time (NZ) | −0.057 | −0.028 | ||
| Flowering length (NZ) | −0.172 | −0.161 | ||
| PC relative importance, % (effect direction) | 39.9 (−) | 26.2 (+) | 17.8 (−) | 16.1 (−) |
PC loadings ≥∣0.200∣ are (arbitrarily) bolded for emphasis. Blank cells indicate loadings ≈0. PC analysis details are in Table S7, graphs of the relationship between PCs and the response variable are in Fig. S4, and prediction errors of ABT models are given in Results. The Table 1 legend describes how relative importance values were calculated.