Pick your trade-offs wisely: Predator-prey eco-evo dynamics are qualitatively different under different trade-offs
Pick your trade-offs wisely: Predator-prey eco-evo dynamics are qualitatively different under different trade-offs
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DOI：
10.1016/j.jtbi.2018.08.013
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发表时间：
2018-11-07
影响因子：
2
通讯作者：
Li, Jing
中科院分区：
文献类型：
--
作者：
Fleischer, Samuel R.;terHorst, Casey P.;Li, Jing
近几十年来，无数的研究探索了捕食者和猎物共同进化的种群动态。在这些模型中有多种选择：在没有捕食者的情况下，猎物呈指数增长或呈逻辑增长，各种形式的捕食者功能反应，以及单向或双向特征轴。此外，为了防止猎物和捕食者特征的逃逸进化，假设了某种形式的权衡。虽然关于各种形式的猎物生长速度和捕食者功能反应有相当多的理论，但只有少数研究探讨了不同类型的权衡如何影响捕食者-猎物动态。在这里，我们比较了两种双营养协同进化模型，通过猎物特征对攻击率和猎物承载能力或内在生长速度的双重影响来考虑不同的权衡。我们采用标准的动力系统方法分析了每个模型的平衡条件，并找到了非平衡振荡共存的条件。各种参数对捕食者-猎物相互作用结果的确切影响取决于权衡是否影响内在增长率或承载能力。特别是，当猎物的生长速度受到进化特征的影响时，共存的可能性更大。此外，在两个模型都存在周期的参数体系中，当猎物生长速度受到进化特征的影响时，振荡通常具有更大的周期和幅度。(C) 2018 Elsevier Ltd.版权所有。
In recent decades, myriad studies have explored the population dynamics of coevolving populations of predator and prey. A variety of choices are made in these models: exponential or logistic prey growth in the absence of a predator, various forms of predator functional response, and uni- or bi-directional trait axes. In addition, some form of trade-offs are assumed in order to prevent run-away evolution of the prey and predator traits. While there is a considerable amount of theory regarding various forms of prey growth rates and predator functional responses, only a few studies have explored how different types of trade-offs affect predator-prey dynamics. Here, we compared two ditrophic coevolution models incorporating different trade-offs via dual effects of the prey trait on attack rate and either prey carrying capacity or intrinsic growth rate. We employed a standard dynamical systems approach to analyze the equilibrium conditions of each model and find conditions for non-equilibrium oscillatory coexistence. The exact effect of various parameters on the outcome of predator-prey interactions depends on whether the trade-offs affect the intrinsic growth rate or carrying capacity. In particular, coexistence is more likely when prey growth rate is affected by the evolving trait. In addition, in parameter regimes where cycles occur in both models, oscillations typically have larger periods and amplitudes when prey growth rate is affected by the evolving trait. (C) 2018 Elsevier Ltd. All rights reserved.