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性遗传约束的限制。 在该项目中，将使用在自然流行开花植物（Mimulus bicolor）范围内采样的种群来研究这些因素对适应的重要性。植物种群将在具有不同降水和温度状态的生长室中种植，以确定植物适应性是否受到预期在边缘预期环境的生理公差的限制。 通过研究种群遗传多样性的模式来确定遗传约束对适应性的作用，以确定范围边缘的种群是否有效地很小，固有地孤立或经历了来自物种范围中心种群的不良适应性基因流量。 了解限制物种分布的机制将提高我们预测物种分布在面对气候变化时将如何变化的能力。 除了回答这个广泛的问题外，该研究还将培训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基因流量的种群结构和模式。 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，并可用于有关物种范围变化的未来管理决策。学生将在研究会议上介绍他们的工作，该会议将向其他科学家和研究人员传播他们的发现。