| Model effects | Estimates | Standard errors | t-values |
| Intercept | 0.469 | 0.135 | 3.484** |
| Natural Wetland | 0.295 | 0.190 | 1.550 |
| Constructed Wetland | 0.019 | 0.190 | 0.100 |
| B. bauchiensis vs Constructed Wetland | 0.894 | 0.269 | 3.321** |