DISSERTATION RESEARCH: Testing Fundamental Constraints on Species Ranges in the Endemic Plant Mimulus bicolor

论文研究：测试特有植物双色酸浆物种范围的基本限制

• 批准号: 1310958
• 负责人: Jeremiah Busch
• 金额: $ 1.96万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-05-01 至 2015-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1310958&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Testing; Fundamental; Constraints

The distribution of a species is thought to be limited by physiological tolerances to the environment, interactions with other organisms, or genetic constraints on adaptation. In this project the importance of these factors on adaptation will be studied using populations sampled across the range of a naturally endemic flowering plant (Mimulus bicolor). Plant populations will be grown in growth chambers with varying precipitation and temperature regimes to determine whether plant fitness is limited by physiological tolerances to environments expected at the range edge. The role of genetic constraints on adaptation will be inferred by studying patterns of population genetic diversity to determine whether populations at range edges are effectively small, inherently isolated, or experience maladaptive gene flow from populations at the center of the species range. Understanding the mechanisms that limit the distribution of species will increase our ability to predict how the distribution of species will shift in the face of climate change. In addition to answering this broad question, the research will train a graduate student and undergraduate students to conduct experiments in controlled environments and to use genetic markers to determine population structure and patterns of gene flow. Each of these approaches will provide critical information on species range limits and can be used for future management decisions regarding species range shifts. Students will present their work at research meetings, which will disseminate their findings to other scientists and researchers.

物种的分布被认为受到对环境的生理耐受性、与其他生物的相互作用或适应的遗传限制的限制。在这个项目中，将使用自然特有的开花植物(双色含羞草)范围内的种群样本来研究这些因素对适应的重要性。植物种群将在不同降水和温度制度的生长室中生长，以确定植物适合性是否受到对范围边缘预期环境的生理耐受性的限制。遗传约束对适应的作用将通过研究种群遗传多样性的模式来推断，以确定范围边缘的种群是有效的小种群、固有的孤立种群，还是经历了来自物种范围中心的种群的不适应基因流。了解限制物种分布的机制将提高我们预测面对气候变化时物种分布将如何变化的能力。除了回答这个广泛的问题，这项研究还将培训一名研究生和本科生在受控环境中进行实验，并使用遗传标记来确定种群结构和基因流动模式。这些方法中的每一种都将提供有关物种范围限制的关键信息，并可用于未来关于物种范围转移的管理决策。学生将在研究会议上展示他们的工作，并将他们的发现传播给其他科学家和研究人员。