Table 1. Results of permutation tests applied to explanatory variables and the axes obtained from RDA models for the whole OTU matrix and for Melissococcus plutonius (OTU4) alone (1,000 replications used).
Initial models contained all possible explanatory variables. Partial models were constructed only for EFB and EFB/PCR variables, while factoring out the coordinates and Julian days. The number of RDA axes generally depends on the number of variables (or their levels) and, therefore, there were no possible results for some instances (indicated by “—”).
| Initial | Partial | |||||||
|---|---|---|---|---|---|---|---|---|
| Variable | P-value | Axis | P-value | Variable | P-value | Axis | P-value | |
| RDA with all OTUs | EFB | 0.678 | 1 | 0.004 | EFB | 0.711 | 1 | 0.301 |
| EFB/PCR | 0.652 | 2 | 0.376 | EFB/PCR | 0.684 | 2 | 0.744 | |
| Julian days | 0.377 | 3 | 0.444 | – | – | 3 | 0.965 | |
| Latitude | 0.925 | 4 | 0.792 | – | – | – | – | |
| Longitude | 0.005 | 5 | 0.973 | – | – | – | – | |
| – | – | 6 | 0.994 | – | – | – | – | |
| RDA with OTU4 only | EFB | 0.203 | 1 | 0.002 | EFB | 0.186 | 1 | 0.335 |
| EFB/PCR | 0.958 | – | – | EFB/PCR | 0.928 | – | – | |
| Julian days | 0.314 | – | – | – | – | – | – | |
| Latitude | 0.768 | – | – | – | – | – | – | |
| Longitude | 0.002 | – | – | – | – | – | – | |