Table 3.
Results of permutational multivariate analysis of variance (PERMANOVA) analysis of dissimilarities for bacterial OTU community structure in relation to cabbage age, fertilizer treatment, and their interaction using UniFrac and Bray–Curtis distances.
| Diversity metric | Statistic | Cabbage age (9 vs. 12 weeks no aphids) | Fertilizer | Cabbage Age∗Fertilizer Interaction |
|---|---|---|---|---|
| Unweighted | Df | 1, 15 | 3, 15 | 3, 15 |
| UniFrac | SS | 0.1112 | 0.3446 | 0.2851 |
| MS | 0.1112 | 0.1149 | 0.0950 | |
| F-value | 1.2374 | 1.2779 | 1.0574 | |
| R2 | 0.0762 | 0.2360 | 0.1953 | |
| p-value | 0.026∗ | 0.001∗∗∗ | 0.17 | |
| Weighted | Df | 1, 15 | 3, 15 | 3, 15 |
| UniFrac | SS | 0.0603 | 0.0687 | 0.0682 |
| MS | 0.0603 | 0.0229 | 0.0227 | |
| F-value | 5.8009 | 2.2007 | 2.1841 | |
| R2 | 0.2152 | 0.2449 | 0.2431 | |
| p-Value | 0.001∗∗∗ | 0.016∗ | 0.011∗ | |
| Bray–Curtis | Df | 1, 15 | 3, 15 | 3, 15 |
| SS | 0.08361 | 0.1602 | 0.1311 | |
| MS | 0.08361 | 0.0534 | 0.0437 | |
| F-value | 2.5576 | 1.6331 | 1.3365 | |
| R2 | 0.13139 | 0.2517 | 0.2060 | |
| p-value | 0.001∗∗∗ | 0.001∗∗∗ | 0.033∗ | |
Df, degrees of freedom; SS, sum of squares; MS, mean sum of squares; R2, % variation explained; F-value, F value by permutation. Bold face indicates statistical significance (p < 0.05) and asterisks indicate the degree of the significance. p-values are based on 999 permutations (i.e., the lowest possible p-value is 0.001).