1. Treeline Ecology Research Unit, Department TeSAF, University of Padova, viale dell'Università 16, 35020 Legnaro (PD), Italy;
2. Department of Fundamental Sciences, Quebec University in Chicoutimi, 55 University Boul, Québec, Canada;
3. Department of Arboriculture, Botany and Plant Pathology, University of Napoli ‘Federico II’, via Università 100, 80055 Portici (NA), Italy;
4. Department AGROSELVITER, University of Torino, via Leonardo da Vinci 44, 10095 Gruglisasco (TO), Italy;
5. Department of Crop Systems, Forestry and Environmental Sciences, University of Bailicata, via dell’Ateneo Lucano 10, 85100 Potenza, Italy