ACKNOWLEDGEMENTS
We are grateful to a very large number of ambitious students and colleagues who helped at various stages of this long-term experiment. The field experiment was part of the GLOWA Jordan River project, funded by the German Ministry of Education and Research (BMBF) and further supported by the DFG SPP 1529 (Adaptomics) of the German Research Foundation (TI338/11-1 and TI338/11-2 to KT, ME 2742/6-1 to JdM and INST 211/575-1 to WWU Münster).