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.

在这个气候快速变化的时代，了解促进植物群多样性和分布的进化和生态过程对于有效的保护策略至关重要。利用最先进的DNA测序技术，本研究调查了芦苇（莎草科）中生态重要的湿地物种群)的进化，并利用这一历史背景来预测不同范围的物种如何对气候变化做出不同的反应。在这个进化框架内，本研究确定了两种濒危的、分布狭窄的芦苇，并将它们与它们最接近的广泛分布的亲戚进行了比较，量化了它们种群中存在的遗传多样性，并模拟了它们对预测的气候制度的反应。几十年来，气候变化一直是一个威胁，但有效的缓解战略仍处于萌芽阶段。由于分配给保护的资源有限，必须优先保护那些最危险的物种。利用本研究提供的进化背景，本研究利用灯心草作为案例研究，以确定在未来气候下，范围狭窄的物种是否比分布广泛的物种更容易灭绝。这项研究的结果将决定一个物种的范围是否能有效地代表灭绝风险，从而允许在濒危物种变得罕见之前识别它们，并最终为保护提供预测和预防的方法，而不是被动的方法。