Table 4.
Parameter estimates and fit of single- and multiple-rate models of BM to the major axes of climate tolerance. Analyses were performed on phylogenies with branch lengths in units of substitutions per site (rates multiplied by 10−4 to allow for easier comparison). Bold indicates the favoured model based on the sample-size-corrected AICc. Positive ΔAICc denotes significant contribution of the multiple-rate BM. σ2, estimated single-rate BM parameter; σ2HERB, rate parameter for herbaceous lineages; σ2WOODY, rate parameter for woody lineages.
| clade | single-rate BM, σ2 | multiple-rate BM |
||
|---|---|---|---|---|
| ΔAICc | σ2HERB | σ2WOODY | ||
| Dipsacales | ||||
| PC1 | 110.84 | 155.90 | 189.93 | 18.21 |
| PC2 | 3.61 | 1.00 | 32.98 | 39.91 |
| Apiales | ||||
| PC1 | 98.94 | 8.50 | 105.36 | 83.49 |
| PC2 | 1.09 | 93.00 | 40.14 | 148.35 |
| Moraceae + Urticaceae | ||||
| PC1 | 52.99 | 6.50 | 82.94 | 38.99 |
| PC2 | 42.67 | 1.90 | 442.45 | 42.01 |
| Primulales | ||||
| PC1 | 41.81 | 77.50 | 45.69 | 0.86 |
| PC2 | 21.35 | 80.20 | 23.38 | 0.39 |
| commelinidsa | ||||
| PC1 | 6.79 | 185.60 | 7.64 | 0.23 |
| PC2 | 3.92 | 260.70 | 4.46 | 0.26 |
aOne of five randomly sampled subsets of 1200 commelinid species.