Dissertation Research: A Phylogenetic Analysis of the Major Lineages of Fishes Utilizing Direct Sequencing of Ribosomal RNA

论文研究：利用核糖体 RNA 直接测序对鱼类主要谱系进行系统发育分析

• 批准号: 8815362
• 负责人: Gregory Whitt
• 金额: $ 1.22万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-11-15 至 1991-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8815362&HistoricalAwards=false
• 关键词: Dissertation; Research; Phylogenetic; Analysis; Major

This study will determine the times of origin and evolutionary relatedness of the major groups of primitive fishes (lampreys, hagfishes, sharks, rays, lungfishes, coelacanth, sturgeons, paddlefish, gars, and bowfins as well as selected species of advanced fishes, whose distinctive morphologies and habitats have arisen relatively recently. Insights into the evolution of fish groups whose ancestors gave rise to all land vertebrates is crucial to our understanding of the evolutionary mechanisms and adaptations leading to the highly diversified and complex vertebrates existing today. The evolutionary tree for these fishes will be constructed on the basis of comparing the sequences of their genes inferred from the sequence of a gene product, RNA. Once the evolutionary tree for fishes is constructed from these molecular data, it will be compared with trees constructed form other kinds of traits, for example morphological differences, in order to determine what combination of traits is most effective in resolving evolutionary relationships. Once the most likely evolutionary tree for the fishes is established, it will be possible to investigate the kinds and rates of evolution that have led to the diversity of fish species that exist today. Once the "history" of fish evolution is established, it will provide insight about the kinds of constraints and opportunities that exist for a species when it faces altered environments (natural or human influenced).

本研究将确定主要原始鱼类群体（七鳃鳗、盲鳗、鲨鱼、鳐鱼、肺鱼、腔棘鱼、鲟鱼、白鲟、鱼和弓鳍）的起源时间和进化关系，以及精选的高级鱼类物种，它们独特的形态和栖息地是最近才出现的。鱼类的祖先是所有陆地脊椎动物的祖先，深入了解鱼类群体的进化对我们理解导致今天存在的高度多样化和复杂的脊椎动物的进化机制和适应至关重要。这些鱼类的进化树将在比较从基因产物RNA序列推断出的基因序列的基础上构建。一旦根据这些分子数据构建了鱼类的进化树，就可以将其与其他特征（例如形态差异）构建的进化树进行比较，以确定哪种特征组合在解决进化关系方面最有效。一旦鱼类最可能的进化树建立起来，就有可能研究导致今天存在的鱼类物种多样性的进化种类和速度。一旦确立了鱼类进化的“历史”，它将提供关于当一个物种面临改变的环境（自然或人类影响）时存在的各种限制和机会的见解。