Nonchaos-Mediated Mixed-Mode Oscillations in a Prey-Predator Model with Predator Dormancy

Chaos-mediated mixed-mode oscillations were recently detected among complex oscillations supported by a prey-predator model including dormancy, a strategy to avoid extinction. Here we show that, as the carrying capacity grows, there are surprisingly wide phases of nonchaos-mediated mixed-mode oscillations that occur before the onset of chaos in the system. Nonchaos-mediated cascades display spike-adding sequences while chaos-mediated cascades show spike-doubling. In addition, we find a host of exotic periodic phases embedded in a region of control parameters dominated by chaotic oscillations of the prey-predator populations. We describe these complicated phases, show how they are interconnected, and how their complexity unfolds as control parameters change. The new nonchaos-mediated phases are stable and large, even at low carrying capacity.

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