Domingo Alcaraz-Segura University of Granada Department of Botany Facultad de Ciencias, Planta 6 Sección de Biología. Campus Universitario de Fuentenueva. Universidad de Granada. 18071. Granada. Spain Phone: +34 958249944 Fax:     +34 958243254 e-mail: dalcarazugr.es Former positions University of Almería Department of Ecology and Plant Biology Edificio Politécnica Nueva 2.52 Crta. Sacramento s/n. 04120 La Cañada de San Urbano, Almería Spain Phone: +34 950015958 Fax:     +34 950015069 University of Buenos Aires and CONICET Laboratory of Regional Analysis and Remote Sensing Av. San Martín 4453 1417 Buenos Aires Argentina Phone: +54 11 4524-8070 (Ext. 8109) Fax:     +54 11 4514-8730