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首页> 外文期刊>Ecological Applications >Multiple plant exploiters on a shared host: Testing for nonadditive effects on plant performance
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Multiple plant exploiters on a shared host: Testing for nonadditive effects on plant performance

机译：共享主机上的多个植物开发者：测试对植物性能的非附加影响

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The combined impact of multiple plant parasites on plant performance can either be additive (the total damage equals the sum of the individual effects) or nonadditive (synergistic or antagonistic damage). Two statistical models are available for testing the independent (=additive) effects of two factors. Here we suggest that the natural history of the plant-parasite system should motivate the choice of a statistical model to test for additivity. Using in-field, manipulative experiments, we examined the interactions between the herbivorous mite Calacarus flagelliseta Fletchmann, De Moraes and Barbosa (Acari: Eriophyidae), the fungal pathogen Oidium caricae F. Noack (a powdery mildew), and their host plant Carica papaya L. in Hawaii. First, we found that herbivorous mites had a moderate negative effect on powdery mildew: when mites were absent, powdery mildew colonies were larger and more numerous. Second, we showed that each plant parasite, when evaluated alone, significantly reduced several measures of plant performance. Third, we found that the combined impact of mites and mildew on plant performance is mostly additive and, for a few variables, less than additive. Finally, we explored compensatory responses and found no evidence for nonlinearities in the relationship between plant performance and cumulative parasite impact. Plants are almost universally subject to attack by multiple herbivores and pathogens; thus a deeper understanding of how multiple plant parasites shape each other's population dynamics and plant performance is essential to understanding plant-parasite interactions.
机译：多种植物寄生虫对植物性能的综合影响既可以是累加的（总损害等于单个效应的总和），也可以是非累加的（协同或拮抗损害）。有两个统计模型可用于测试两个因素的独立（=加和）效应。在这里，我们建议植物寄生虫系统的自然历史应该激发选择统计模型来测试可加性。通过现场操作实验，我们检查了草食螨Calacarus flagelliseta Fletchmann，De Moraes和Barbosa（Acari：Eriophyidae），真菌病原体Oidium caricae F. Noack（白粉病）与其寄主植物番木瓜之间的相互作用。 L.在夏威夷。首先，我们发现草食性螨对白粉病有中等程度的负面影响：当没有螨时，白粉病菌落会更大并且数量更多。其次，我们表明，每种植物寄生虫单独进行评估时，会显着降低几种衡量植物生长性能的指标。第三，我们发现，螨虫和霉菌对植物生长的综合影响主要是累加的，而且在某些变量下，小于累加的。最后，我们探索了补偿性反应，没有发现植物性能与寄生虫累积影响之间存在非线性关系的证据。植物几乎普遍受到多种食草动物和病原体的攻击。因此，深入了解多种植物寄生虫如何塑造彼此的种群动态和植物性能对于理解植物-寄生虫的相互作用至关重要。

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