Presentation given at the GSA annual meeting in Houston TX October 5-9 2008

1. Equilibrium precipitation of  18 O and  13 C in unionid freshwater mussels Emma Versteegh Hubert Vonhof, Simon Troelstra, Dick Kroon Paleoclimatology & Geomorphology

3. Rivers Meuse and Rhine

5. δ 18 O rivers Snow melt High discharge Flood Dry summer

7. Monitoring experiment: collecting and tagging Unionids

8. Monitoring experiment: cages in fish ladders

9. Monitoring locations

12. Predicted shell δ 18 O Meuse Lek (Rhine distributary)

13. Typical shell δ 18 O record

14. Monitoring: Shell records (Lek)

15. δ 13 C of HCO 3 -

16. Predicted and measured shell δ 18 O Onset of growth: 9.5 °C Growth stop: 14.6 °C

17. δ 13 C of HCO 3 - and shells

18. δ 13 C of HCO 3 - and shells

20. Thank you!