Abstract
Cooperation in a population system can result in the occurrence of a coexistence (win–win) equilibrium. When diffusion is incorporated, individual species possibly invade into far ends with different spreading speeds (co-speed or fast–slow speed). Predicting or determining them becomes challenging. This paper is devoted to the complete understanding of propagation dynamics to a cooperative Lotka–Volterra system, in addition of the determinacy of these speeds. The first major contribution of this paper is to establish a necessary and sufficient condition for the existence of a single spreading speed. In the existence of a single spreading speed (i.e., the two species share a common invasion speed), nonnegative traveling wave profiles, connecting the extinction equilibrium, exist, if the wave speed is not less than the common speed. We find that predicting or determining the invasion speed can be linked to the linearized system at the extinction state, and linear/nonlinear selections are established. The existence of multiple spreading speeds indicates new connections of traveling wave profiles into certain intermediate states. Due to this, the determinacy of multiple spreading speeds focuses not only on the extinction state but also on the corresponding intermediate states. Based on our constructions of upper–lower solutions, we also establish analytic criteria that can determine the fast–slow invasive speeds. Our speed selection mechanism can also help scientists greatly understand the movement of stacked fronts in cooperative systems with multiple species.
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Huang, Z., Ou, C. Spreading speeds determinacy for a cooperative Lotka–Volterra system with stacked fronts. Z. Angew. Math. Phys. 74, 73 (2023). https://doi.org/10.1007/s00033-023-01965-3
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DOI: https://doi.org/10.1007/s00033-023-01965-3