Figure 3: View of a North- (a) and a South- (b) facing slope of Wadi Shuayb, Jordan. The North-facing slope corresponds to a core habitat for many annual (low stature) species and the South-facing slope to a mosaic of marginal habitats with patches of mild habitats created by benefactors (Box  1). (c) Facilitation by the benefactor Gymnocarpos decanter of annual vegetation on the South-facing slope.