Maclean, I.M.D., Austin, G.E., Rehfisch, M.M., Blew, J., Crowe, O., Delany, S., Devos, K., Deceuninck, B., G. 2008. Climate change causes rapid changes in the distribution and site abundance of birds in winter. Global Change Biology 14: 2500. doi:10.1111/j.1365-2486.2008.01666.x