Author Contributions:
HF Cooper collected trait data, performed genetic and statistical analyses, and wrote much of the manuscript. RJ Best contributed to the development of the QST plasticity calculation and helped with the theoretical development of the paper and writing. She, JPM Corbin, and IJ Garthwaite also assisted with some field collections and sample processing. LV Andrews helped with RADseq processing. GJ Allan, CA Gehring, KR Hultine, KR Grady, and TG Whitham, designed the common garden experiment. All authors provided critical edits to the manuscript and figures.