Acknowledgments
We thank Prof. Walter Lämmler for his efforts maintaining the Landolt
duckweed collection and for providing us with the strains used in this
experiment. Thanks to Owen Petchey and the whole Petchey group for
advice and Yves Choffat for technical support in the lab. Sofia Vamos
provided helpful feedback on the manuscript. This study was funded by
the University of Zurich (Forschungskredit 31259 awarded to S.J.V.M.)