The S. Mamede Natural Park includes a mountain area, distributed along S. Salvador de Aramenha (Marvão municipality) and S. Julião (Portalegre municipality) regions. Contrasting with the population evolution in Portugal for the last 20 years (+4%) the population decreased 27% in Marvão and 6% in Portalegre. The number of people in farming business in both municipalities decreased around 34% (1989-1999). In S. S...