Predator-Induced Dispersal and the Evolution of Conditional Dispersal in Correlated Environments
Predator-Induced Dispersal and the Evolution of Conditional Dispersal in Correlated Environments
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DOI：
10.1086/651595
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发表时间：
2010-05-01
影响因子：
2.9
通讯作者：
Hovestadt, Thomas
中科院分区：
文献类型：
--
作者：
Poethke, Hans Joachim;Weisser, Wolfgang W.;Hovestadt, Thomas
人们普遍认为，生物会根据当地人口密度调整它们的扩散倾向，但没有分析它们应该如何应对减少当地人口密度的环境条件的变化。我们以蚜虫的延迟捕食者诱导扩散（PID）为例，探索当前环境条件如何被用作扩散决策的适当信号。在蚜虫中，捕食者的存在会引发有翅膀的后代的产生，这些后代可能会在以后离开植物，并永久地转移它们的活动中心。使用基于个体的模拟和分析近似，我们探索在哪些条件下PID可能进化。我们证明，这需要在捕食风险和猎物之间的弱竞争中存在实质性的时间相关性；这些条件可以在蚜虫系统中得到满足。我们讨论了PID的具体情况与面对时空相关的繁殖或生存恶化的条件迁移的演变之间的类比。
It is widely accepted that organisms adjust their dispersal propensity to local population density, but there has been no analysis of how they should react to changes in environmental conditions that reduce local density. We take the case of delayed predator-induced dispersal (PID) in aphids to explore in which way current environmental conditions may be utilized as an appropriate signal for dispersal decisions. In aphids, the presence of predators triggers the production of winged offspring that may later leave the plant and shift their center of activity permanently. Using individual-based simulations as well as analytical approximations, we explore under which conditions PID is likely to evolve. We demonstrate that this requires substantial temporal correlation in predation risk and weak competition among prey; these conditions may be fulfilled in the aphid system. We discuss the analogy between the specific case of PID and the evolution of conditional emigration in the face of spatiotemporally correlated deterioration in reproduction or survival.