Theory predicts that herbivore pressure should be weaker on islands than on the mainland, owing to lower herbivore abundance and diversity because of dispersal constraints and environmental filtering. As a result, plants on islands should invest less in defences against herbivory. Although early empirical studies supported these predictions, recent systematic island–mainland comparisons have questioned this paradigm, with some studies reporting either no difference between islands and mainland or higher herbivory and plant defences on islands. Current data therefore appear to be unsupportive of predictions on insularity effects on plant–herbivore interactions, calling for more research to reassess predictions and to test underlying mechanisms for observed patterns.

中文翻译：

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未来研究岛屿对植物-草食动物相互作用的影响的路线图

理论预测，由于散布限制和环境过滤，草食动物的丰度和多样性较低，因此岛屿上的食草动物压力应该比大陆要弱。因此，岛上的植物应该减少对食草动物的防御投资。尽管早期的实证研究支持了这些预测，但最近系统的岛屿 - 大陆比较对这种范式提出了质疑，一些研究报告要么岛屿和大陆之间没有差异，要么岛屿上的草食和植物防御更高。因此，目前的数据似乎不支持关于植物-草食动物相互作用的岛屿效应的预测，需要更多的研究来重新评估预测并测试观察到的模式的潜在机制。