The Ricker Competition Model of Two Species: Dynamic Modes and Phase Multistability

The model of two species competing for a resource proposed by R. May and A.P. Shapiro has not yet been fully explored. We study its dynamic modes. The model reveals complex dynamics: multistable in-phase and out-of-phase cycles, and their bifurcations occur. The multistable out-of-phase dynamic modes can bifurcate via the Neimark-Sacker scenario. A value variation of interspecific competition coefficients changes the number of in-phase and out-of-phase modes. We have suggested an approach to identify the bifurcation (period-doubling, pitchfork, or saddle-node bifurcations) due to which in-phase and out-of-phase periodic points appear. With strong interspecific competition, the population's survival depends on its growth rate. However, with a specific initial condition, a species with a lower birth rate can displace its competitor with a higher one. With weak interspecific competition and sufficiently high population growth rates, the species coexist. At the same time, the observed dynamic mode or the oscillation phase can change due to altering of the initial condition values. The influence of external factors can be considered as an initial condition modification, leading to dynamics shift due to the coexistence of several stable attractors.

Automated summary

This study examines the dynamic modes of a model proposed by May and Shapiro, which involves two species competing for a resource. The model exhibits complex dynamics, such as multistable in-phase and out-of-phase cycles, along with their bifurcations. The number of in-phase and out-of-phase modes can be altered by varying the interspecific competition coefficients. The study also proposes an approach to identify the bifurcation types responsible for the appearance of in-phase and out-of-phase periodic points.