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.

该项目将贡献甲壳类分类单元的序列数据，这些数据是在优先计划1174中推断出的后生系统发育所必需的。经过四年的数据获取后，主要目标是了解数据分析方法中暗示的对齐方式和假设，这些方法在数据分析方法中产生错误树中错误的方法。我们想评估可用的证据，以支持节肢动物树的Curstacea部分中的进化枝。当前甲壳类和内部系统发育关系的重建仍然非常竞争和分歧。在该项目中，我们希望测试昆虫杂质的单一，上颌骨概念，thecostraca的单性概念，Mystacocarida，Remipedia，Remipedia，Cephalocarida和Malacostraca的位置，Thoracopoda概念，Palliata假设。在与其他群体合作的情况下，我们想推断昆虫或气管的确切位置，考虑来自昆虫，myriapods，甲壳类动物和螯合物分类单元的数据。我们负责甲壳类数据。因此，分析有两个级别：在单个项目中（甲壳酸酯内的系统发育）和优先级程序（节肢动物系统发育）。在最后的资金期间，我们希望使用454序列技术添加仍然缺少Remipedia，Mystacocarida，Cephalocarida和Pentastomida的数据。复杂的替代模型的应用（尤其是允许时间杂种性）改善了我们的分析，但仍出现人工制品。最困难的任务是发现隐藏长分支的虚假进化枝支持和影响。在与协调项目的密切合作中，我们将使用新工具来分析对齐方式，以更好地理解动物系统发育。