Table 4.
The effects of habitat characteristics of the population of origin and its size on mean trait values of plants of Saxifraga sponhemica grown in a common garden
| Dependent variable | r2 | d.f. | F | Explanatory variable | β | t-value |
|---|---|---|---|---|---|---|
| Vegetative traits | ||||||
| PC LEAFSIZE | 0·44 | 18 | 4·68* | PC SUMMWARM | 0·52 | 2·84* |
| PC CONTIN | −0·36 | −2·04 | ||||
| Log Popsize | 0·33 | 1·83 | ||||
| Leaf narrowness | 0·66 | 18 | 11·75*** | PC CONTIN | 0·68 | 5·00*** |
| PC PRECIP | −0·33 | −2·43* | ||||
| PC SUMMWARM | −0·29 | −2·09 | ||||
| SLA (sqrt) | 0·26 | 20 | 6·94* | PC CONTIN | −0·51 | −2·63* |
| Reproductive traits | ||||||
| PC PETALSIZE | 0·35 | 20 | 10·67** | PC CONTIN | −0·59 | −3·27** |
| PC REPRO | 0·57 | 19 | 12·49*** | PC CONTIN | −0·62 | −4·10*** |
| PC PRECIP | −0·43 | −2·86** | ||||
| Start of flowering | 0·51 | 19 | 10·06** | PC CONTIN | −0·65 | −4·06*** |
| PC PRECIP | −0·31 | −1·91 | ||||
The models for which the Bayesian information criterion is minimal are presented. Possible explanatory variables were the principal components PC SUMMWARM, PC CONTIN, PC PRECIP and rock habitat (rock faces = 1, walls and screes = 0), orientation (absolute deviation from north) and population size. No significant relationship to any of the variables was found for PC PLANTSIZE.
Only PCs and dependent variables not strongly correlated with the PCs (see Table 2) were studied.
*P < 0·05; **P < 0·01; ***P < 0·001.