Table 4.
Test statistics for beta diversity as a function of physiochemical variables and other operational factors
| Method: Relate | |||
| Variable | Significance (%) | Rho. | |
| Physiochemical data | 0.2% | 0.677 | |
| Method: Best | |||
| Variable | Physiochemical correlation (R) | ||
| pH | 0.725 | ||
| CH4%, Total VFAs, formic, and isobutyric | 0.724 | ||
| Method: DistLM | |||
| Variable | p value | Cumulative variance explained (%) | |
| Marginal | |||
| mL Biogas/g VS/day | 0.012 | – | |
| CH4% | 0.039 | – | |
| mL CH4/g VS/day | 0.006 | – | |
| g VS/L | 0.004 | – | |
| % VSR | 0.021 | – | |
| pH | 0.003 | – | |
| Total VFA | 0.005 | – | |
| Sequential | |||
| + pH | 0.002 | 49.4% | |
| Method: ANOSIM | |||
| Factor | Global R | Significance level (%) | |
| Physiochemical | RS:DM | 1.0 | 0.3 |
| HRT | 0.75 | 4.7 | |
| Beta-diversity | RS:DM | 0.81 | 2.2 |
| HRT | 0.667 | 7.3 | |
| Method: Permanova | |||
| Factor | p value | Sq.root of estimates of component of variation | |
| Physiochemical | RS:DM | 0.002 | 1.49 |
| HRT | 0.004 | 0.57 | |
| Beta-diversity | RS:DM | 0.018 | 2.62 |
| HRT | 0.276 | 7.26 | |
Tests–RELATE, giving correlation of comparisons (Rho); BEST, trend correlation; DistLM, distance based linear model; ANOSIM, analysis of similarities; PERMANOVA, permutational multivariate analysis of variance
aItalic indicates statistically significant results