Molecular phylogenetic analyses of crustaceans

甲壳类动物的分子系统发育分析

• 批准号: 5453336
• 负责人: Professor Dr. Johann Wolfgang Wägele
• 金额: --
• 依托单位: Leibniz-Institut zur Analyse des Biodiversitätswandels (LIB)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5453336?language=en
• 关键词: Molecular; phylogenetic; analyses; crustaceans

This project will contribute sequence data of crustacean taxa that are required for the metazoan phylogeny that is being inferred in the Priority Programme 1174. After four years of data acquisition the main goal is to understand alignment patterns and assumptions implied in data analyses methods that produce errors in phylogenetic trees. We want to evaluate available evidence to support clades in the Curstacea part of the arthropod tree. The current reconstructions of phylogenetic relationships of and within the Crustacea are still very competing and diverging. Within the project we want to test the monophyly of Entomostraca, the Maxillopoda concept, the monophyly of Thecostraca, the position of Mystacocarida, Remipedia, Cephalocarida and Malacostraca, the Thoracopoda concept, the Palliata hypothesis. In cooperation with other groups we want to infer the exact position of the Insecta or Tracheata considering data from insects, myriapods, crustaceans and chelicerate taxa. We are responsible for the crustacean data. Therefore there are two levels of analyses: Within the single project (phylogeny within Crustacea) and within the Priority Programme (arthropod phylogeny). In the last funding period we want especially add data for the still missing Remipedia, Mystacocarida, Cephalocarida, and Pentastomida, using the 454 sequence technology. Applications of complex substitution models (especially allowing for time-heterogeneity) improved our analyses, but nevertheless artefacts still appear. The most difficult task is to discover false clade support and effects of hidden long branches. In close cooperation with the coordination project we will use new tools for analyses of alignment patterns to contribute to a better understanding of animal phylogeny.

该项目将提供优先计划 1174 中推断的后生动物系统发育所需的甲壳动物类群的序列数据。经过四年的数据采集，主要目标是了解数据分析方法中隐含的对齐模式和假设，这些方法会产生错误在系统发育树中。我们想要评估现有的证据来支持节肢动物树的甲壳科部分的进化枝。目前对甲壳类及其内部系统发育关系的重建仍然非常有竞争力和分歧。在该项目中，我们想要测试昆虫纲的单系性、颌足纲的概念、顶足纲的单系性、Mystacocarida、Remipedia、Cephalocarida 和 Malacostraca 的位置、胸足纲概念、Palliata 假说。与其他小组合作，我们希望根据昆虫、多足类、甲壳类和螯类类群的数据来推断昆虫纲或气管纲的确切位置。我们负责甲壳类数据。因此，有两个层次的分析：在单一项目内（甲壳动物内的系统发育）和在优先计划内（节肢动物系统发育）。在上一个资助期间，我们特别希望使用 454 序列技术添加仍然缺失的 Remipedia、Mystacocarida、Cephalocarida 和 Pentastomida 的数据。复杂替代模型（特别是考虑到时间异质性）的应用改进了我们的分析，但仍然出现了伪影。最困难的任务是发现错误的进化枝支持和隐藏的长分支的影响。通过与协调项目的密切合作，我们将使用新工具来分析比对模式，以有助于更好地了解动物系统发育。