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Fig. 7 Box-whisker diagrams showing reconstructed d18Ow records per season for three shells from the Meuse. Colours of the boxes indicate if discharge was very high (dark blue), high (light blue), normal (white), low (light yellow) or very low (dark yellow) (see Fig. 4). In the background, dark to light grey areas indicate 2, 5, 25, 75, 95 and 98% percentiles of d18Ow values during the growing season (April–October) of the 1997–2007 record. a Bergen 1918 (Unio crassus), b Vierlingsbeek 1977 (U. pictorum), c Waalwijk 1977 (U. pictorum) From: Versteegh, E.A.A., Vonhof, H.B., Troelstra, S.R., Kroon, D., 2011. Can shells of freshwater mussels (Unionidae) be used to estimate low summer discharge of rivers and associated droughts? International Journal of Earth Sciences 100(6): 1423-1432.