1. National Institute for Agriculture and Food Research and Technology (INIA); Forest Research Centre (CIFOR); 28040 Madrid Spain
2. Sustainable Forest Management Research Institute; University of Valladolid & INIA; 34004 Palencia Spain
3. Department of Biogeography and Global Change; Museo Nacional de Ciencias Naturales (BGC-MNCN-CSIC); E-28006 Madrid Spain