Table 2.
Relationship between feedback strength and the individual and higher order effects of treatment (conspecific versus heterospecific feedbacks), origin (native versus exotic) and relative abundance in the savannah community (based on 160 field plots, area 1 m2 per plot).
| source | d.f. | F ratio | probability > F |
|---|---|---|---|
| treatment | 1 | 69.36 | <0.0001 |
| origin | 1 | 21.54 | <0.0001 |
| treatment × origin | 1 | 16.13 | <0.0001 |
| abundance × treatment | 1 | 6.51 | 0.0110 |
| abundance × treatment × origin | 1 | 4.74 | 0.0300 |
| abundance × origin | 1 | 2.21 | 0.14 |
| abundance | 1 | 0.96 | 0.33 |