Table 2.
Soil type, tree cover and their interaction as predictors of (a) topographic change (= change in ordination axis 1 scores), (b) biogeographical change (= change in percentage northerly-origin species); no other physical variables considered in similar models had significant main or interactive effects as predictors of community change (see text)
| SS | d.f. | MS | F | P | |
|---|---|---|---|---|---|
| (a) Change in ordination Axis 1 score (R2 = 0·070, n = 97) | |||||
| Soil | 1264 | 1 | 1264 | 1·896 | 0·172 |
| Tree cover | 883 | 1 | 0883 | 1·324 | 0·263 |
| Interaction | 3051 | 1 | 3051 | 4·574 | 0·035 |
| Error | 62031 | 93 | 667 | ||
| (b) Change in percentage northerly-origin species (R2 = 0·065, n = 108) | |||||
| Soil | <0·001 | 1 | <0·001 | 0·001 | 0·975 |
| Tree cover | 0·504 | 1 | 0·504 | 5·057 | 0·027 |
| Interaction | 0·017 | 1 | 0·017 | 0·168 | 0·682 |
| Error | 10·365 | 104 | 0·100 | ||