Table 4.
Results of permutational multivariate analysis of variance (PERMANOVA) analysis of dissimilarities for bacterial OTU community structure of 12 week cabbage rhizospheres in relation to herbivory (±aphids), fertilizer treatment and their interaction using UniFrac and Bray–Curtis distances.
| Diversity metric | Statistic | Herbivory (±aphids) | Fertilizer | Herbivory∗Fertilizer |
|---|---|---|---|---|
| Unweighted | Df | 1, 15 | 3, 15 | 3, 15 |
| UniFrac | SS | 0.0945 | 0.3232 | 0.2755 |
| MS | 0.0945 | 0.1077 | 0.0918 | |
| F-Value | 1.0128 | 1.1541 | 0.9838 | |
| R2 | 0.0657 | 0.2244 | 0.1913 | |
| p-Value | 0.335 | 0.001 | 0.678 | |
| Weighted | Df | 1, 15 | 3, 15 | 3, 15 |
| UniFrac | SS | 0.0095 | 0.0804 | 0.0324 |
| MS | 0.0095 | 0.0268 | 0.0108 | |
| F-Value | 0.7984 | 2.2632 | 0.9134 | |
| R2 | 0.0436 | 0.3705 | 0.1495 | |
| p-Value | 0.609 | 0.005∗∗ | 0.587 | |
| Bray–Curtis | Df | 1, 15 | 3, 15 | 3, 15 |
| SS | 0.0339 | 0.1752 | 0.0986 | |
| MS | 0.0339 | 0.0584 | 0.0329 | |
| F-Value | 0.9365 | 1.6137 | 0.9088 | |
| R2 | 0.0567 | 0.2933 | 0.1652 | |
| p-Value | 0.601 | 0.001∗∗∗ | 0.789 | |
Df, degrees of freedom; SS, sum of squares; MS, mean sum of squares; F-value, F-value by permutation; R2, % variation explained. Bold face indicates statistical significance (p < 0.05) and asterisks indicate degree of significance. p-values are based on 999 permutations (i.e., the lowest possible p-value is 0.001).