“…Most underlying research, however, has focused on ecosystems dominated by herbaceous vegetation, such as those in Africa, Australia and the United States, while only little work has so far been done to address the applicability of these concepts to shrubland ecosystems of the highlands in the Middle East and Northern Africa, such as the Atlas mountains in Morocco, the Asir and Hijaz mountains in Saudi Arabia, the southern Zagros mountains in Iran as well as the highlands of Ethiopia, Oman and Yemen. Agricultural production in these countries is largely constrained by scarce and variable rainfall, and due to rapid population growth and increasing meat consumption, they increasingly rely on the import of staple foods, meat and meat products as well as animal feed (Amid, 2007;Sarris, 2000). In the context of raising import prices for all these commodities, the improvement of livestock production in traditional systems, which is commonly criticized for its low productivity (Hamadeh et al, 2001;Thomas et al, 2002;Zaibet et al, 2004) and strongly relies on the natural shrublands as fodder resources, has consequently become an important task.…”