Table 2. PERMANOVA main tests of bacterial community composition based on Jaccard dissimilarities of ARISA profiles.
| Sources of variation | d.f. | SS | pseudo F | p (perm) 1 | Sq. root |
| Season | 3 | 104240 | 24.066 | 0.001 | 27.297 |
| Dilution | 2 | 99744 | 34.543 | 0.001 | 28.508 |
| pH | 2 | 8222.3 | 2.8475 | 0.001 | 6.6905 |
| Season×Dilution | 6 | 162610 | 18.772 | 0.001 | 41.498 |
| Season×pH | 6 | 20929 | 2.416 | 0.001 | 11.713 |
| Dilution×pH | 4 | 15976 | 2.7663 | 0.001 | 11.33 |
| Season×Dilution×pH | 12 | 48537 | 2.8015 | 0.001 | 22.881 |
| Residuals | 143 | 206460 | 37.997 | ||
| Total | 178 | 667400 |
1
Significant results (p (perm)<0.05) are highlighted in bold.
Displayed are tests for the factors ‘season’, ‘dilution’, ‘pH’ and their interactions and the partitioning of multivariate variation. p-values were obtained using type III sums of squares and 999 permutations under the full model. d.f.: degrees of freedom, SS: sums of squares, Sq. root: square root of the component of variation attributable to that factor in the model, in units of Jaccard dissimilarities.