| Model effects | Estimates | Standard errors | t-values |
| Intercept | 7.286 | 1.292 | 5.641*** |
| Natural wetland | −2.790 | 1.827 | −0.195 |
| Constructed wetland | −0.356 | 1.827 | −0.195 |
| B. bauchiensis vs Treatment site | 6.121 | 2.583 | 2.369* |