Fig. 2.

Microbial concentrations from the spatial sampling campaign. Crassphage, HF183, and norovirus are in units of log₁₀ cp/100 ml. E. coli and enterococci are in units of log₁₀ MPN/100 ml. Filled circles represent measured concentrations. Red Xs represent non-detects. Boxplot centerlines are medians, bottoms and tops of boxes are 25^th and 75^th percentiles, and whiskers extend to the furthest data point within a distance of 1.5 × interquartile range from the 25^th and 75^th percentiles, respectively. Individual points are displaced horizontally to aid visualization. N = 4 for each sampling site (S1 through S6). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)