DISSERTATION RESEARCH: Phylogenomics and biogeography of Vochysia, unraveling its tempo and mode of evolution

论文研究：Vochysia 的系统基因组学和生物地理学，揭示其进化速度和模式

• 批准号: 1601533
• 负责人: Robert Jansen
• 金额: $ 2.01万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1601533&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Phylogenomics; biogeography; Vochysia

One of the most intriguing questions in modern biogeography relates to Neotropical plant diversity. The high number of species in this region was once thought to be due to the antiquity of rainforest habitats; however, recent studies suggest that many Neotropical flowering plant groups have been diversifying in the last 10-20 my. Recent episodes of plant diversification in the neotropics raise questions such as why have there been so many recent speciation events and what were the contributing biotic and abiotic factors. This study aims to investigate the biogeography and origin of Vochysia, a strictly Neotropical group that is hyper-diverse, widely distributed and relatively young. By contributing to a better understanding about the drivers of recent diversification in a group of plants, it will lead to an improvement in general conservation strategies since it will improve knowledge about species distribution and diversification. This research will be valuable for the academic progress of a graduate student and an undergraduate student that is gaining experience in bioinformatics, data analysis, laboratory, and herbarium protocols. This project seeks to improve the knowledge of the historical biogeography of plants of the neotropics by investigating the tempo and mode of Vochysia diversification. A phylogenetic reconstruction of the group will be done using next generation sequencing and computational analytical tools to provide a phylogenetic tree for investigating the evolutionary history of Vochysia. The analysis of the mode of evolution will be done using software for phylogenetic tree dating calibration, biogeographical reconstruction, and niche modeling. Results from these analyses will allow inferences to be made about the relative importance of vicariance versus dispersal and niche conservatism versus divergence with an emphasis on endemic and rare species of Vochysia. The tempo of Vochysia diversification will involve comparing the net diversification rates within the genus and between sub-clades from different biomes using a modern Bayesian-based software that models the complex dynamics of species diversification.

现代生物地理学中最有趣的问题之一与新热带植物多样性有关。这个地区的物种数量之多曾经被认为是由于热带雨林栖息地的古老；然而，最近的研究表明，许多新热带开花植物群在过去的10-20年中已经多样化。最近在新热带地区发生的植物多样化事件提出了一些问题，比如为什么会有这么多最近的物种形成事件，以及什么是促成生物和非生物因素。摘要本研究的目的是探讨一个高度多样化、广泛分布和相对年轻的严格的新热带类群——伏奇亚的生物地理学和起源。通过有助于更好地理解一组植物最近多样化的驱动因素，它将导致一般保护策略的改进，因为它将提高对物种分布和多样化的认识。这项研究将有助于研究生和本科生在生物信息学、数据分析、实验室和植物标本室协议方面的学术进步。本项目旨在通过研究植物多样性的速度和模式，提高对新热带植物历史生物地理学的认识。利用下一代测序和计算分析工具对该群体进行系统发育重建，为研究volchysia的进化史提供系统发育树。进化模式的分析将使用软件进行系统发育树定年校准、生物地理重建和生态位建模。从这些分析的结果将允许推断相对重要性的迁移与分散和生态位保守性与分化的沃奇亚特有和稀有物种的重点。Vochysia多样化的速度将涉及使用基于现代贝叶斯的软件来比较属内和不同生物群系亚枝之间的净多样化率，该软件模拟了物种多样化的复杂动态。

项目成果

Under the rug: Abandoning persistent misconceptions that obfuscate organelle evolution

• DOI: 10.1016/j.ympev.2020.106903
• 发表时间: 2020-10-01
• 期刊: MOLECULAR PHYLOGENETICS AND EVOLUTION
• 影响因子: 4.1
• 作者: Goncalves, Deise J. P.;Jansen, Robert K.;Mandel, Jennifer R.
• 通讯作者: Mandel, Jennifer R.