1. Terrestrial Ecology Group; Department of Ecology; Faculty of Sciences; University of Granada; Avd. Fuentenueva s/n 18071 Granada Spain
2. School of Forestry; Northern Arizona University; Flagstaff AZ 86011 USA
3. Department of Plant Biology and Ecology; Faculty of Science and Technology; University of Basque Country; Barrio Sarriena s/n 48940 Leioa Basque Country
4. Área de Botánica; Departamento de Biología; Centro Andaluz Superior de Estudios Marinos (CASEM); Universidad de Cádiz; Campus Río San Pedro 11510 Puerto Real Cádiz, Spain