DISSERTATION RESEARCH: Phylogeny, biogeography, and population genetics of Scirpus (Cyperaceae)

论文研究：三棱属植物（莎草科）的系统发育、生物地理学和群体遗传学

• 批准号: 1311153
• 负责人: Kenneth Sytsma
• 金额: $ 1.96万
• 依托单位: University of Wisconsin-Madison
• 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 2015-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1311153&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Phylogeny; biogeography; population

An understanding of the evolutionary and ecological processes that have contributed to the diversity and distribution of our flora is critical for effective conservation strategies in this era of rapid climate change. Utilizing state-of-the-art DNA sequencing technologies, this research investigates the evolution of the bulrushes, an ecologically important group of wetland species in the sedge family (Cyperaceae), and utilizes this historical context to predict how species with disparate ranges may differentially respond to climate change. Within this evolutionary framework, this study identifies two endangered, narrowly distributed bulrushes and compares them to their most closely related widespread relatives, quantifying the genetic diversity present within their populations and modeling their responses to predicted climatic regimes.Climate change has been a threat for decades, yet effective mitigation strategies are still nascent. As resources allocated to conservation are limited, it is essential to prioritize by protecting those species most at risk. Using the evolutionary context afforded by this study, this research utilizes the bulrushes as a case study in order to determine if species with narrow ranges are inherently more at risk of extinction under future climates than widespread species. The results of this study will determine whether the range of a species is a useful proxy for extinction risk, thereby allowing for the identification of at-risk species before they become rare and ultimately informing a predictive and preventative, rather than reactive, approach to conservation.

了解进化和生态过程，有助于我们的植物群的多样性和分布是至关重要的有效保护战略，在这个时代的快速气候变化。利用国家的最先进的DNA测序技术，这项研究调查的芦苇，在莎草科（莎草科）的湿地物种的生态重要的一组的演变，并利用这一历史背景下，预测不同的范围内的物种如何可能差异应对气候变化。在这个进化的框架内，这项研究确定了两种濒危的，分布狭窄的芦苇，并将它们与其最密切相关的广泛的亲戚进行比较，量化其种群内存在的遗传多样性，并模拟其对预测气候制度的反应。气候变化几十年来一直是一个威胁，但有效的缓解策略仍然是新生的。由于分配给保护的资源有限，必须优先保护那些风险最大的物种。使用本研究提供的进化背景，本研究利用芦苇作为案例研究，以确定是否具有狭窄范围的物种在未来的气候下比广泛的物种更容易灭绝。本研究的结果将确定物种的范围是否是灭绝风险的有用代表，从而允许在高危物种变得稀有之前识别它们，并最终为预测性和预防性而不是反应性的保护方法提供信息。