RUI: Three-Trophic Level Interactions in an Aquatic Macrophyte Hybrid Zone

RUI：水生植物杂交区的三营养级相互作用

• 批准号: 9307012
• 负责人: Jamin Eisenbach
• 金额: $ 18.07万
• 依托单位: Eastern Michigan University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-06-01 至 1996-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9307012&HistoricalAwards=false
• 关键词: RUI; Three; Trophic; Level; Interactions

This research will investigate a three trophic level interaction in a hybrid zone of cattails. The three levels of interactions include: the cattails and the hybrid, herbivores that eat the seeds of the cattails, and parasites that infect the seed-eating herbivores. To study how herbivory varies among the three types of cattails, field experiments will examine the herbivore loads sustained by these cattails over a broad geographic range. The role that hybridization and introgression play in influencing rates of herbivory and parasitoidism will be addressed with a transplant study using potted plants of various crosses. Herbivore exclusion and addition experiments will examine 1) whether the pattern of reduced herbivory on the hybrid cattails can be attributed to plant properties or parasites, 2) the degree of dependence that one species of seed eating herbivore has on the presence of another. %%% ALthough hybridization of plants has been responsible for 30-70% of the genetic variation in and among plant species, little is known about the three-way interactions that occur in zones of hybridization. By focussing on the patterns of herbivory and the herbivore-natural enemy interactions, the dynamic nature of plant hybrid zones will be elucidated. This research will make an important contribution to understanding the role of hybridization and control of natural enemies in plant populations.

这项研究将调查香蒲混合区的三个营养级相互作用。相互作用的三个层面包括：香蒲和杂种、吃香蒲种子的食草动物以及感染吃种子的食草动物的寄生虫。为了研究这三种香蒲的食草性如何变化，田间实验将检查这些香蒲在广泛的地理范围内承受的食草动物负荷。杂交和基因渗入在影响食草和寄生率中所起的作用将通过使用各种杂交的盆栽植物进行移植研究来解决。 草食动物排除和添加实验将检查 1) 杂交香蒲食草减少的模式是否可归因于植物特性或寄生虫，2) 一种以种子为食的草食动物对另一种食草动物存在的依赖程度。 %%% 尽管植物杂交造成了植物物种内部和植物物种之间 30-70% 的遗传变异，但人们对杂交区域中发生的三向相互作用知之甚少。通过关注草食动物的模式和草食动物与天敌的相互作用，植物杂交区的动态性质将得到阐明。这项研究将为了解杂交和控制植物种群中天敌的作用做出重要贡献。