Long-term decreasing trend in faecal pollution levels Over the whole Danube River including the most important tributaries, a clear trend towards lower faecal pollution levels from the year 2001 (JDS1, dark green symbols) to 2019 (JDS 4, dark blue symbols) was observed (Fig. 1 ).
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Long-term impact of basin-wide wastewater management on faecal pollution levels along the entire Danube River.
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The high correspondence between the patterns of faecal pollution of the four JDS is reflected by the highly significant positive correlations between the E. coli concentrations of all four surveys (Fig. 2 ).