Evolution of specialization under non-equilibrium population dynamics

JOURNAL OF THEORETICAL BIOLOGY

卷:321

Article

Nurmi, Tuomas¹  Parvinen, Kalle^1,2 

[1] Univ Turku, Dept Math, FIN-20014 Turku, Finland

[2] Int Inst Appl Syst Anal, Evolut & Ecol Program, A-2361 Laxenburg, Austria

关键词: Adaptive dynamics;    Resource utilization;    Trade-off;    Specialist;    Generalist;   

DOI  :  10.1016/j.jtbi.2012.12.018

来源: Elsevier

【 摘 要 】

We analyze the evolution of specialization in resource utilization in a mechanistically underpinned discrete-time model using the adaptive dynamics approach. We assume two nutritionally equivalent resources that in the absence of consumers grow sigmoidally towards a resource-specific carrying capacity. The consumers use resources according to the law of mass-action with rates involving trade-off. The resulting discrete-time model for the consumer population has over-compensatory dynamics. We illuminate the way non-equilibrium population dynamics affect the evolutionary dynamics of the resource consumption rates, and show that evolution to the trimorphic coexistence of a generalist and two specialists is possible due to asynchronous non-equilibrium population dynamics of the specialists. In addition, various forms of cyclic evolutionary dynamics are possible. Furthermore, evolutionary suicide may occur even without Allee effects and demographic stochasticity. (C) 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

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