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The impact of plant chemical diversity on plant-herbivore interactions at the community level

机译：植物化学多样性对社区一级植物-草食动物相互作用的影响

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摘要

Understanding the role of diversity in ecosystem processes and species interactions is a central goal of ecology. For plant-herbivore interactions, it has been hypothesized that when plant species diversity is reduced, loss of plant biomass to herbivores increases. Although long-standing, this hypothesis has received mixed support. Increasing plant chemical diversity with increasing plant taxonomic diversity is likely to be important for plant-herbivore interactions at the community level, but the role of chemical diversity is unexplored. Here we assess the effect of volatile chemical diversity on patterns of herbivore damage in naturally occurring patches of Piper (Piperaceae) shrubs in a Costa Rican lowland wet forest. Volatile chemical diversity negatively affected total, specialist, and generalist herbivore damage. Furthermore, there were differences between the effects of high-volatility and low-volatility chemical diversity on herbivore damage. High-volatility diversity reduced specialist herbivory, while low-volatility diversity reduced generalist herbivory. Our data suggest that, although increased plant diversity is expected to reduce average herbivore damage, this pattern is likely mediated by the diversity of defensive compounds and general classes of anti-herbivore traits, as well as the degree of specialization of the herbivores attacking those plants.
机译：了解多样性在生态系统过程和物种相互作用中的作用是生态学的中心目标。对于植物-草食动物的相互作用，已经假设当植物物种多样性减少时，植物生物量向草食动物的损失增加。尽管长期存在，但这一假设得到了不同的支持。随着植物分类学多样性的增加，植物化学多样性的增加对于社区一级植物-草食动物的相互作用可能很重要，但是化学多样性的作用尚待探索。在这里，我们评估了挥发性化学多样性对哥斯达黎加低地湿润森林中天然存在的吹笛（Piperaceae）灌木斑块中草食动物损害模式的影响。易挥发的化学多样性对食草动物的总危害，专科危害和通才危害。此外，高挥发性和低挥发性化学多样性对草食动物损害的影响之间也存在差异。高挥发性的多样性减少了专门的食草，而低挥发性的多样性减少了一般的食草。我们的数据表明，尽管预计增加植物多样性将减少平均食草动物损害，但这种模式可能是由防御性化合物的多样性和抗草食动物性状的一般类别以及攻击这些植物的食草动物的专业化程度所介导的。

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