Dynamical Models of Interactions between Herds Forage and Water Resources in Sahelian Region
Figure 1
Phase portrait of the herd’s animals and forage resources when r < 0. This illustrates the global stability of equilibrium for System (1). This is a new situation, which happens during migration of pastoralists with their herds, calling transhumance; the pastoralists leave the area because of scarcity of forage resources. The parameters in this case are given in Table 1.