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.

在这个迅速的气候变化时代，对有效的菌群多样性和分布的进化和生态过程的理解对于有效的保护策略至关重要。利用最先进的DNA测序技术，这项研究调查了Bulrushes的演变，Bulrushes是Sedge家族（Cyperaceae）中重要的湿地物种（Cyperaceae），并利用这一历史背景来预测不同范围的物种如何不同地反应气候变化。在这个进化框架内，本研究确定了两个濒临灭绝的，狭义的扁砂，并将它们与它们最密切相关的广泛亲戚进行了比较，量化了人口中存在的遗传多样性，并模拟了他们对预测的气候变化的反应。几十年来，它们一直是一种威胁，但有效的减轻策略仍然是零星的。由于分配给保护的资源是有限的，因此必须通过保护最有风险的物种来确定优先级。利用本研究提供的进化环境，本研究利用Bulrushes作为案例研究，以确定具有狭窄范围的物种在未来气候下是否本质上比广泛的物种更容易受到灭绝的风险。这项研究的结果将确定物种的范围是否是灭绝风险的有用代理，从而允许在处于危险中的稀有物种变得稀有并最终为预测性和预防性提供信息，而不是反应性的保护方法。