Table 5.
Discrimination capacity of SFB, coliforms and C. perfringens spores (CP) for habitats differing in presumptive faecal pollution levels (7 tested pairs)*
| Fecal indicators | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| TC | FC | E. coli | CP | SFB | |||||||
| Compared category |
Compared Pairs | +/−† | log10 BCRM‡ | +/− | log10 BCRM | +/− | log10 BCRM | +/− | log10 BCRM | +/− | log10 BCRM |
| I | BL–BH | − | 0.7 | − | 0.4 | − | 0.6 | − | 0.4 | − | np |
| BL–OP | + | 3.7 | − | 2.8 | + | 3.1 | + | 2.7 | (+) | np | |
| BH–OP | + | 3.0 | + | 2.4 | + | 2.5 | + | 2.4 | (+) | np | |
| II | BL–S | + | 5.6 | + | 4.9 | + | 5.1 | + | 4.4 | (+) | np |
| BH–S | + | 4.9 | + | 4.4 | + | 4.5 | + | 4.0 | (+) | np | |
| OP–S | + | 1.9 | + | 2.0 | + | 2.0 | + | 1.7 | + | 1.8 | |
| III | US–DS | − | 0.3 | − | 0.5 | − | 0.7 | + | 0.6 | + | 1.4 |
Abbreviations: For BL, BH, OP, US, DS, TC, FC, CP, SFB see Tables 2 and 3; S, pooled stream data set including US and DS.
Mann–Whitney test for pairwise difference, + indicates p < 0.05 while—indicates p > 0.05 and corrected for multiple tests using Bonferroni correction.
log10 BCRM = log10 of the bacteriological concentration ratio of the medians; np = calculation was not possible as SFB were not detectable in BL and BH and thus no algorithm could be applied. However, from a practical point of view a significant difference between not detectable and detected concentrations exists (+). n = 6 pooled sites × 18 to 36 samples per pooled site.