Table 1. Pearson correlation coefficient (r) for wastewater physico-chemical factors and number of OTUs observed (after 3% cutoff) on stone (ST) and tyre derived rubber (TDR) media a .
| Biofilms |
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| Stone (ST) |
Tyre-derived rubber (TDR) |
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| OTUs | Invisimpson | BOD | DO | OTUs | Invisimpson | BOD | DO | |
| BOD5 | 0.277 (NS) | 0.817 (NS) | –0.651 (NS) | –0.988 (NS) | ||||
| DO | 0.382 (NS) | 0.302 (NS) | 0.058 (NS) | –0.017 (NS) | –0.0321 (NS) | 0.012 (NS) | ||
| pH | 0.724 (NS) | –0.021 (NS) | –0.594 (NS) | 0.947 (NS) | –0.632 (NS) | –0.993 (NS) | 0.999* | 0.207 (NS) |
| Temp (°C) | 0.852** | 0.961 (NS) | 0.685* | 0.362 (NS) | –0.044 (NS) | –0.0867 (NS) | 0.669* | 0.241 (NS) |
aKey: n = 9, p < 0.01**, p < 0.05*, NS = p > 0.05; a two tail test was used.