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Fig. 2 Discharge (Q) of the Meuse for the time interval November 1911 to Dec 2007. Considerable long-term variation in both maxima and minima is visible. Blown-up figures show discharges for the time intervals in which the shells grew. The time interval 1912–1918 has several high discharge summers (e.g. 1916 and 1917), whereas the time interval 1969–1977 generally has very dry summers and exhibits several severe summer droughts (e.g. 1971 and 1976). 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.