Fig. 4. Detection of E. coli (100 g1) in samples of blue mussels (Mytilus edulis) from Hvaler (Station 5., Fig. 1, during 2009 and 2010) and Vemmelsvik (Station 3., Fig. 1, during 2008
and 2009), and daily rainfall in millimetre (sliding average over 30 days). Red horizontal line shows the limit for an A area of 230 E. coli 100 g1. (For interpretation of the references
to colour in this figure legend, the reader is referred to the web version of this article.)