Table 3.
Comparison of the effects of treatment and matrix on E. coli decrease in freshwater mesocosmsa
| Source of variation | % of total variation | P value |
|---|---|---|
| Water vs sediment | 55.4 | <0.0001 |
| Treatmentb | 35.7 | <0.0001 |
| Interaction | 1.48 | 0.11 |
| Post hoc tests | ||
| Natural vs disinfected | ||
| Water | <0.0001 | |
| Sediment | <0.0001 | |
| Natural vs antimicrobial treated | ||
| Water | <0.05 | |
| Sediment | >0.05 |
a
Shown are the effects of treatment (natural, antimicrobial treated, or disinfected) and matrix on E. coli decrease in freshwater mesocosms (n = 5) for the September experiment. Statistical significance was determined by two-way ANOVA.
b
Natural (all indigenous microbiota present), antimicrobial treated (cycloheximide addition), and disinfected.