Precipitation drives global variation in natural selection by Siepielski, A, Morrissey, M, Buoro, M, Carlson, S, Caruso, C, Clegg, S, Coulson, T, DiBattista, J, Gotanda, K, Francis, C, Hereford, J, Kingsolver, J, Augustine, K, Kruuk, L, Martin, R, Sheldon, B, Sletvold, N, Svensson, E, Wade, M, MacColl, A