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Effects of an asynchronous alien host on a native host-parasitoid system

机译：异步外来主机对本机主机-寄生寄生系统的影响

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摘要

We present a discrete-generation model to study the effect of a seasonally asynchronous alien host on the population dynamics of a native host/parasitoid system. We assume that i) the native host and parasitoid are seasonally synchronous; ii) there is no direct competition for resources between the two host species (one native, one alien); and iii) the introduced alien host population (the alternative host) is in an invasive stage and, consequently, it is not subject to any density-dependent regulation. In our model, variations in the annual number of generations (voltinism) of the alien host greatly alter the dynamics of the native host/parasitoid interaction. When the alien host is synchronous with the native host, the parasitoid is favoured, and the native host population decreases until reaching a new, lower equilibrium or becoming extinct. By contrast, when alien and native hosts are asynchronous with each other, there are population oscillations of the native community members compatible with the pulsating availability of the alien host and, under specific conditions, the parasitoid may rapidly become extinct. (C) 2018 Elsevier B.V. All rights reserved.
机译：我们提出了一个离散世代模型来研究季节性异步外星人宿主对原生宿主/类寄生虫系统种群动态的影响。我们假设：i）原生寄主和寄生虫是季节性同步的； ii）两种寄主物种（一种本土物种，一种外来物种）之间没有资源的直接竞争； iii）引入的外来宿主种群（替代宿主）处于入侵阶段，因此不受任何依赖密度的调节。在我们的模型中，外星宿主的年世代数（伏特论）的变化极大地改变了原生宿主/寄生虫相互作用的动力学。当外来宿主与原生宿主同步时，拟寄生虫会受到青睐，原生宿主数量会减少，直到达到新的，较低的平衡或灭绝为止。相比之下，当外来宿主与本地宿主彼此异步时，本地社区成员的种群振荡与外来宿主的脉动可用性相适应，并且在特定条件下，拟寄生虫可能会迅速灭绝。 （C）2018 Elsevier B.V.保留所有权利。

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