Figure 4. Conceptual model of the relationship between climate warming and the occurrence of E. coli, intestinal enterococci and cyanobacteria

Blue arrows indicate that a certain cause-phenomenon (e.g. droughts) increase a certain effect-phenomenon (e.g. low water).
Yellow arrows indicate that a certain cause-phenomenon (e.g. water temperature) decreases a certain effect-phenomenon (e.g. E. coli concentration).
Grey dashed arrows indicate that the link between a certain cause and effect is either unclear or there is contradictory evidence in existing literature.