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Partial Mantel tests to compare relative impacts of spatial distance (Spa) and environmental distance (Env) on bacterial community (Spa is the geographic distance matrix and Env is the environmental heterogeneity matrix calculated with Euclidean).
| Groups | Factors | r (correlation) | p (significance) |
|---|---|---|---|
| All control sites | Spa | 0.60 | 0.001 |
| Env | 0.44 | 0.001 | |
| Dam-control sites | Spa | 0.64 | 0.001 |
| Env | 0.20 | 0.015 | |
| Dam-affected sites | Spa | 0.39 | 0.002 |
| Env | 0.55 | 0.001 | |
