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Fig. 6 Correlation of discharge (Q) and d18Ow values for the Meuse during the years 1997 to 2007 for all months (circles) with a logarithmic fit (light grey line) with equation: d18Ow ¼ 0:315 lnQ 5:592 (R2 = 0.60; p\0.0005) and for the growing season of the shells (squares) with a logarithmic fit (dark grey line) with equation d18Ow ¼ 0:291 lnQ 5:659 (R2 = 0.44; p\0.0005). 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.