RUI: Interactions of Natural Enemy Impact and Host Plan Genotype on Herbivore Survival

昆虫植食性植物研究中的一个中心问题 相互作用的问题是：造成变异的因素是什么？ 在同种寄主间植食性密度和存活率 植物在人口？ 虽然有很多可能 机制、寄主植物抗性变异和天敌 以前工作强烈建议影响是重要的。 理论和经验证据表明， 植物抗性和植物之间的可变敌人影响可能是 在植物-食草动物系统中常见且重要。 的概念 三个拓扑层次的相互作用和敌人影响假说 提出了植物抗性之间相互作用的三个主要途径 敌人的影响。 这项研究的主要目的是确定 这些相互作用途径的相对重要性， 寄主植物基因型和天敌影响。 这些问题的答案对发展 植物-食草动物-天敌相互作用理论 了解影响人口的过程， 同种间植食性昆虫群落变异 植物 实验方案将确定：1） 对三种植食性害虫抗性遗传力及相关分析 在杨柳上，2）敌人影响的变化存在于 植物基因型及其与植物抗性的相关性; 植物基因型或其他基因型 草食性物种直接或间接影响敌人的影响， 4)几种直接和间接机制的相对重要性， 食草动物之间的间接竞争。 其他 实验将检查特定途径的细节， 植物基因型、其他草食动物物种和 天敌的影响。

A central question in the study of insect herbivore-plant interactions is: What are the factors responsible for variation in herbivore density and surviorship among conspecific host plants in a population? Although there are many possible mechanisms, variation in host plant resistance and in enemy impact are strongly suggested as important by previous work. Theory and empirical evidence suggests that interactions between plant resistance and variable enemy impact among plants may be common and important in plant-herbivore systems. The concept of three tophic level interactions and the enemy impact hypothesis pose three main pathways of interactions between plant resistance and enemy impact. The main goal of this research is to determine the relative importance of these pathways of interaction between host plant genotype and natural enemy impact in this system. Answers to these questions are important to the development of theory of plant-herbivore-natural enemy interactions and to understanding the processes that influence population and community variation of herbivorous insects among conspecific plants. The experimental program will determine: 1) the heritability and correlation of resistances to three herbivores on willow, 2) the presence of variation in enemy impact among plant genotypes and its correlation with plant resistance, 3) the relative importance of pathways by which plant genotype or other herbivore species directly or indirectly affect enemy impact, and 4) the relative importance of several mechanisms of direct and indirect competitive interactions between herbivores. Other experiments will examine details of specific pathways of interaction between plant genotype, other herbivore species, and natural enemy impact.