Acknowledgements
We gratefully acknowledge funding from the National Science Foundation
(DEB1354224 to E.C. and DEB1354022 to N.M.W.) and the Swedish Research
Council (grant 330-2014-6439 to M.R.). We thank Katie Burns, Arvid
Lindh, Clara Stuligross, John Mola, Jessica Drost, Charley Nye, Kimiora
Ward, and Staci Cibotti for their assistance in the field and
laboratory. We are also grateful to the landowners and managers of Yolo,
Colusa and Solano counties who permitted us to use their properties as
field sites.