FIG. 2.

Seasonal shifts in the population densities of E. coli and potential pathogenic bacteria in lake- and ditchside Cladophora samples determined by MPN-PCR (A) and QPCR (B). Solid bars, E. coli; striped bars, Campylobacter; open bars, Salmonella. Samples were obtained in 2005, and the bars and error bars indicate means and standard errors, respectively.