For each stream, we used paired T-test analysis on log-transformed data from the two reaches to examine the effect of theWWTPinput on physical, chemical, biological and nutrient uptake parameters. Independent samples T-test on log-transformed data from the upstream reaches of the two streams was used to compare chemical, biological and nutrient uptake parameters between the two streams. All data were log-transformed to stabilize variances and normalize the
data sets. The effect of the point-source on the nutrient uptake metrics was also examined using regression analysis between the change in nutrient uptake metrics downstream of the WWTP relative to upstream (i.e., (downstream valu −upstream value) / upstream value) and the relative contribution of the point-source to downstream nutrient loads (i.e., (downstream loads−upstream loads)/ upstream loads).
For each stream, we used paired T-test analysis on log-transformed data from the two reaches to examine the effect of theWWTPinput on physical, chemical, biological and nutrient uptake parameters. Independent samples T-test on log-transformed data from the upstream reaches of the two streams was used to compare chemical, biological and nutrient uptake parameters between the two streams. All data were log-transformed to stabilize variances and normalize thedata sets. The effect of the point-source on the nutrient uptake metrics was also examined using regression analysis between the change in nutrient uptake metrics downstream of the WWTP relative to upstream (i.e., (downstream valu −upstream value) / upstream value) and the relative contribution of the point-source to downstream nutrient loads (i.e., (downstream loads−upstream loads)/ upstream loads).
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