Dissertation Research: The Consequence of Early Selection on Life History Evolution

论文研究：早期选择对生命史进化的影响

• 批准号: 0608422
• 负责人: Deborah Roach
• 金额: $ 1.19万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-01 至 2008-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0608422&HistoricalAwards=false
• 关键词: Dissertation; Research; Consequence; Early; Selection

Selection operating at different points in the life cycle may ultimately limit or accelerate the pace of evolution, depending on how traits are linked across life stages. The research proposed here will examine the strength and direction of selection within and across life stages, focusing particularly on the delayed effects of selection early in the life cycle of an annual invasive plant, Agrostemma githago [Caryophyllaceae]. This will be addressed in a large-scale field experiment, in which the selective regime early in the life cycle is manipulated through the use of serial transplants. The experimental design is unique in facilitating a comparison of different selective regimes across the early life stages, while keeping late life environments constant across treatments. This research thus represents a novel way to assess how life histories are shaped and constrained through selective events taking place across the life cycle of a species. It will explore life history evolution in a natural population, and will account for temporal variation in selection. The results from this experiment will respond to longstanding questions in the fields of life history evolution and biodemography. By addressing which life stage is most critical to the success of an invading species, the results from this work will also be relevant to conservation efforts. The broader impacts of this research include an undergraduate research component for two undergraduate women currently working on projects related to this research.

在生命周期的不同阶段进行的选择最终可能会限制或加速进化的速度，这取决于特征在生命阶段之间的联系方式。 这里提出的研究将检查的强度和方向的选择内和跨生命阶段，特别是在一年生入侵植物，Agrostemma githago [嘉禾科]的生命周期早期选择的延迟效应。这将在一个大规模的田间实验中解决，在生命周期的早期选择性制度是通过使用系列移植操纵。 实验设计是独特的，在促进不同的选择性制度的比较，在整个生命早期阶段，同时保持生命后期的环境恒定的治疗。 因此，这项研究代表了一种新的方式来评估生命史是如何通过一个物种生命周期中发生的选择性事件来塑造和约束的。它将探索自然种群的生活史进化，并解释选择的时间变化。这项实验的结果将回答生命史、进化和生物人口学领域长期存在的问题。 通过解决哪个生命阶段对入侵物种的成功最关键，这项工作的结果也将与保护工作有关。 这项研究的更广泛的影响包括一个本科生的研究组成部分，两名本科生妇女目前正在从事与这项研究有关的项目。