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Mean E. coli concentrations over time in the natural treatments (△ and ▲) and in the disinfected controls (□ and ■) in freshwater (water column [A] and sediments [B]) and seawater (water column [C] and sediments [D]) mesocosms. Data are means of values from five individual replicate mesocosms; error bars represent standard deviations. Shown are results from the March and April experiments.
