Grazing dampens the positive effects of shrub encroachment on ecosystem functions in a semiarid woodland

encroachment on ecosystem functions in a semi-arid woodland David J. Eldridge*, Santiago Soliveres, Matthew A. Bowker and James Val Office of Environment and Heritage, c/o Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Departamento de Biolog ıa y Geolog ıa, Escuela Superior de Ciencias Experimentales y Tecnolog ıa, Universidad Rey Juan Carlos, c/Tulip an s/n, 28933 M ostoles, Spain; School of Forestry, Northern Arizona University, 200 East Pine Knoll Drive, PO Box 15018, Flagstaff, AZ 86011, USA; and Office of Environment and Heritage, P.O. Box 363, Buronga, NSW 2739, Australia