Dissertation Research: Ecological Causes of the Evolution of Self-Pollination in Clarkia xantiana: The Role of Geographic Variation in Biotic Interactions

论文研究：Clarkia xantiana 自花授粉进化的生态原因：地理变异在生物相互作用中的作用

• 批准号: 0104582
• 负责人: Monica Geber
• 金额: $ 1.3万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-05-15 至 2004-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0104582&HistoricalAwards=false
• 关键词: Dissertation; Research; Ecological; Causes; Evolution

The proposed work tests hypotheses on the causes of the evolution of self-pollination in Clarkia xantiana, a native annual plant composed of an outcrossing and a self-pollinating subspecies. Previous work shows that the two subspecies differ in geographic range, plant community associations, and population size. This project examines the role of plant population size and plant community interactions in determining the abundance of pollinating bees and whether an outcrossing versus self-pollinating mating system is advantageous. The proposed work investigates (1) the distribution and abundance of specialist bee pollinators with respect to the mating system and population attributes of C. xantiana, (2) the factors affecting whether reproductive output is limited by the abundance of pollinators, and (3) the effects of population size and the plant community on the relative success of C. xantiana individuals that vary in mating system. A combination of field observations, field experiments, and molecular genetic analyses will be employed to address these problems.The evolution of self-pollination is among the most common events in the evolutionary history of flowering plants. While the biological consequences of self-pollination (e.g. inbreeding) are well known, the ecological causes of this evolutionary transition have rarely been considered. This project will also provide new information on the importance of native bee communities and plant communities in the viability of plant populations.

拟开展的工作测试的原因，在Clarkia xantiana，一个本地的一年生植物组成的异交和自花授粉的亚种自花授粉的进化假说。 以前的工作表明，这两个亚种在地理范围，植物群落协会和人口规模方面有所不同。 本项目研究植物种群大小和植物群落相互作用在确定授粉蜜蜂的丰度以及异交与自花授粉交配系统是否有利方面的作用。 本论文主要研究了：（1）蜜蜂传粉者的分布和丰度与蜜蜂的交配系统和种群特性的关系;（2）传粉昆虫的数量是否限制了生殖产量的因素;（3）种群大小和植物群落对黄毛菊相对成功的影响。在交配系统中变化的xantiana个体。 这些问题将通过田间观察、田间实验和分子遗传学分析相结合的方法来解决。自花授粉的进化是有花植物进化史上最常见的事件之一。 虽然自花授粉的生物学后果（例如近亲繁殖）是众所周知的，但这种进化转变的生态原因很少被考虑。 该项目还将提供关于本地蜜蜂群落和植物群落在植物种群生存能力方面的重要性的新信息。