Multiparametric monitoring of microbial faecal pollution reveals the dominance of human contamination along the whole Danube River

Longitudinal development of E. coli and Enterococci concentrations along the increasing discharge (grey shaded area) of the Danube in the midstream, at the left (upper line) and the right river-side (lower line) and in the tributaries sampled during JDS 2013. Not-sampled tribtaries are also indiacted on the x-axes. Symbol size varies according to log-transformed E. coli and Enterococci concentrations. Colours depict the faecal pollution levels: blue - little, green - moderate, yellow - crtitical, orange - strong and red excessive pollution. Grey-shaded triangles indicate discharge contributions from the main tributaries.277