1 23 Biodiversity and Conservation ISSN 0960-3115 Volume 20 Number 12 Biodivers Conserv (2011) 20:2831-2843 DOI 10.1007/s10531-011-0112-2 Grazing effects on plant functional group diversity in Mediterranean shrublands Alexandra D. Papanikolaou, Nikolaos M. Fyllas, Antonios D. Mazaris, Panayiotis G. Dimitrakopoulos, Athanasios S. Kallimanis, et al.