Cyclic prey evolution with cannibalistic predators

JOURNAL OF THEORETICAL BIOLOGY

卷:479

Article

Lehtinen, Sami O.¹  Geritz, Stefan A. H.¹ 

[1] Univ Helsinki, Dept Math & Stat, FIN-00014 Helsinki, Finland

关键词: Adaptive dynamics;    Ecological bistability;    Fold bifurcation of periodic orbits;    Subcritical Hopf bifurcation;    Supercritical Hopf bifurcation;   

DOI  :  10.1016/j.jtbi.2019.06.025

来源: Elsevier

【 摘 要 】

We investigate the evolution of timidity in a prey species whose predator has cannibalistic tendencies. The ecological model is derived from individual-level processes, in which the prey seeks refuge after detecting a predator, and the predator cannibalises on the conspecific juveniles. Bifurcation analysis of the model reveals ecological bistability between equilibrium and periodic attractors. Using the framework of adaptive dynamics, we classify ten qualitatively different evolutionary scenarios induced by the ecological bistability. These scenarios include ecological attractor switching through catastrophic bifurcations, which can reverse the direction of evolution. We show that such reversals often result in evolutionary cycling of the level of timidity. In the absence of cannibalism, the model never exhibits ecological bistability nor evolutionary cycling. We conclude that cannibalistic predator behaviour can completely change both the ecological dynamics and the evolution of prey. (C) 2019 The Authors. Published by Elsevier Ltd.

【 授权许可】

Free