TABLE 2.
Correlation parameter | Correlation coefficient |
||||
---|---|---|---|---|---|
E. coli (MPN/100 ml) | Enterococcus spp. (MPN/100 ml) | PMMoV by qPCR (GC/100 ml) | PMMoV _contig1 | PMMoV_ reads mapped to reference genome | |
Microbial indicators | |||||
E. coli (MPN/100 ml) | 0.554 | 0.599 | |||
Enterococcus spp. (MPN/100 ml) | 0.859 | 0.588 | 0.541 | ||
PMMoV (GC/100 ml) | 0.612 | 0.549 | 0.788 | 0.888 | |
Environmental parametersb | |||||
Temp (°C) | −0.344 | −0.426 | −0.209 | ||
pH | 0.432 | 0.394 | |||
EC | 0.521 | 0.588 | 0.394 | 0.565 | 0.543 |
TDS (ppm) | 0.507 | 0.585 | 0.358 | 0.516 | 0.495 |
Salinity (PSU) | 0.515 | 0.595 | 0.371 | 0.525 | 0.518 |
DO (ppm) | −0.345 | −0.333 | −0.440 | −0.356 | |
Turbidity (PFU) | 0.503 | 0.572 | 0.379 | ||
Chemical tracers | |||||
ACE (ng/liter) | 0.590 | 0.638 | 0.658 | 0.721 | 0.549 |
ACT (ng/liter) | 0.631 | 0.727 | 0.473 | 0.638 | 0.642 |
CBZ (ng/liter) | 0.530 | 0.717 | 0.712 | ||
CYC (ng/liter) | 0.564 | 0.590 | 0.609 | 0.811 | 0.792 |
Land use categories | |||||
Residentialb | 0.421 | 0.412 | 0.678 | 0.728 | 0.608 |
Urban | 0.497 | 0.503 | 0.473 | ||
Green | −0.588 | −0.585 | −0.702 | −0.757 | −0.705 |
Weightage | 0.583 | 0.583 | 0.728 | 0.766 | 0.713 |
Only significant correlations are shown (with Bonferroni correction, 2-tailed t test). All correlations were significant at P values of <0.01, except for values in boldface, for which P values were <0.05. Abbreviations: TDS, total dissolved solids; DO, dissolved oxygen; PSU, practical salinity units; ACE, acesulfame; ACT, acetaminophen; CYC, cyclamate; CBZ, carbamazepine.
For environmental parameters oxidation-reduction potential [ORP] (in millivolts), 24-h rainfall and 5-day rainfall (in millimeters), and antecedent dry period (in days) and for land use category “Agriculture,” no significant correlation was found; therefore, these parameters are not included in the table.