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首页> 外文期刊>The American Naturalist: Devoted to the Conceptual Unification of the Biological Sciences >Should models of disease dynamics in herbivorous insects include the effects of variability in host-plant foliage quality?
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Should models of disease dynamics in herbivorous insects include the effects of variability in host-plant foliage quality?

机译：草食性昆虫的疾病动力学模型是否应包括寄主植物叶片质量变化的影响？

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摘要

Interactions between insects and their baculovirus pathogens are often described using simple disease models. Baculoviruses, however, are transmitted when insects consume virus-contaminated foliage, and foliage variability, whether within or between host-plant species, can affect viral infectiousness. Insect-baculovirus interactions may thus be embedded in a tritrophic interaction with the insect's host plant, but disease models include only the host and the pathogen. We tested these models by measuring the transmission of a baculovirus of gypsy moths (Lymantria dispar) on red oak (Quercus rubra) and white oak (Quercus alba) in the field in six experiments over four years. In all experiments, there were only weak effects of host-tree species, and in only one did the best-fitting model include tree species effects. These weak effects of foliage variability on transmission were not due to a lack of foliage variability on viral infectiousness, because when larvae were force-fed virus-contaminated foliage, infection rates were higher on white oak. Our results suggest that feeding behavior plays an important role in baculovirus transmission and that models can usefully describe baculovirus dynamics even without including foliage variability. Our work provides a clear example of how two-species models are sometimes sufficient to describe what appear to be tritrophic interactions.
机译：通常使用简单的疾病模型来描述昆虫及其杆状病毒病原体之间的相互作用。但是，杆状病毒是在昆虫食用受病毒污染的叶子时传播的，无论是在寄主植物物种内部还是之间，叶子的变异性都可能影响病毒的传染性。因此，昆虫杆状病毒相互作用可以嵌入与昆虫宿主植物的三营养相互作用中，但是疾病模型仅包括宿主和病原体。我们在四年中的六个实验中，通过测量吉普赛蛾杆状病毒（Lymantria dispar）在红橡树（Quercus rubra）和白橡树（Quercus alba）上的传播来测试这些模型。在所有实验中，寄主树种的影响都很微弱，只有一种最适合的模型包括树种的影响。叶面变异对传播的这些弱影响并不是由于缺乏叶面变异对病毒感染性的缘故，因为当幼虫被强行喂食病毒污染的叶时，白橡树的感染率更高。我们的结果表明，进食行为在杆状病毒传播中起着重要作用，并且该模型可以有效地描述杆状病毒的动态，甚至不包括叶面变异性。我们的工作提供了一个清晰的例子，说明有时两种物种模型如何足以描述看似三养的相互作用。

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