Instability of oscillations in the Rosenzweig-MacArthur model of one consumer and two resources

The system of two resources R-1 and R(2 )and one consumer C is investigated within the Rosenzweig-MacArthur model with a Holing type II functional response. The rates of consumption of particular resources are normalized as to keep their sum constant. Dynamic switching is introduced as to increase the variable C in a process of finite speed. The space of parameters where both resources coexist is explored numerically. The results indicate that oscillations of C and mutually synchronized R-i, which appear equal for the rates of consumption, are destabilized when these rates are modified. Then, the system is driven to one of fixed points or to a limit cycle with a much smaller amplitude. As a consequence of symmetry between the resources, the consumer cannot change the preferred resource once it is chosen. Published under an exclusive license by AIP Publishing.