Protected areas facilitate species' range expansions. por Thomas, C, Gillingham, P, Bradbury, R, Roy, D, Anderson, B, Baxter, J, Bourn, N, Crick, H, Findon, R, Fox, R, Hodgson, J, Holt, A, Morecroft, MD, O'Hanlon, N, Oliver, T, Pearce-Higgins, J, Procter, D, Thomas, J, Walker, K, Walmsley, C, Wilson, R, Hill, J