1. IGA Research Group, High Polytechnic School of Avila, University of Salamanca, Av. de los Hornos Caleros, 50, 05003 Ávila, Spain
2. Forest, Water & Soil Research Group, Catholic University of Ávila, C/Canteros s/n, 05005 Ávila, Spain
3. Department of Geology, High Polytechnic School of Zamora, University of Salamanca, Av. de Requejo, 33, 49022 Zamora, Spain
4. IGA Research Group, Department of Statistics, University of Salamanca, Campus Miguel de Unamuno, C/Alfonso X El Sabio s/n, 37007 Salamanca, Spain
5. Department of Animal Biology and Ecology, Faculty of Biology, University of Salamanca, Campus Miguel de Unamuno, C/Donantes de Sangre s/n, 37007 Salamanca, Spain