Table 4
Spearman correlations between biological metrics (BMWP, IBE AQEM, HR-SI, saprobity module) and physicochemical parameters that indicate organic pollution (significant correlation p < 0.05 are shown bold). All metrics were calculated with NIMS included or excluded; saprobity module calculated with NIMS included, excluded and combined (included into IBE AQEM, excluded from HR-SI).
| BMWP | IBE AQEM | HR-SI | Saprobity module | |
|---|---|---|---|---|
| included/ excluded | included / excluded | included / excluded | included / excluded / combined | |
| BOD5 (mgO2 L−1) | −0.42 / -0.39 | −0.26 / −0.27 | 0.21/0.29 | −0.30 / −0.28 / −0.34 |
| Organic N (mgN L−1) | −0.45 / -0.44 | −0.3/−0.32 | 0.37 / 0.37 | −0.37 / −0.30 / −0.38 |
| TOC (mg L−1) | −0.20 / −0.24 | −0,27/−0.28 | 0.08/0.19 | −0.14 / −0.12 / −0.22 |
| NH4 (mgN L−1) | −0.17 / −0.19 | −0.21/−0.20 | 0.34 /0.23 | −0.26/−0.21 /−0.20 |
| P-total (mgP L−1) | −0.20 / −0.20 | −0.22/−0.18 | 0.46/0.37 | −0.36/−0.31 /−0.32 |
| Chlorides (mg L−1) | −0.32 /−0.28 | −0.24/−0.24 | −0.06/−0.02 | −0.10/0.00/−0.12 |
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