Fig. 2

Typical flow cytometric density and histogram plots from the five investigated natural and engineered freshwater ecosystems (groundwater a, c, river water b. d, lake water e, h, tap water f, i, wastewater g, j) stained with SYBR Green I. Dotted black lines indicate electronic gates separating bacteria from background. Blue and red gates/dotted lines indicate electronic gates separating LNA and HNA content bacteria. FL1-A indicates green fluorescence intensity, FL3-A indicates red fluorescence intensity