Molekulare Phylogenie und Biogeographie der Chamäleons

变色龙的分子系统发育和生物地理学

• 批准号: 108380142
• 负责人: Professor Dr. Miguel Vences
• 金额: --
• 依托单位: Zoologisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/108380142?language=en
• 关键词: Molekulare; Phylogenie; und; Biogeographie; der

Chameleons are a group of lizards characterized by various unique and spectacular morphological features. They also are an appropriate model with which to decipher biogeographic questions such as the relative importance of dispersal or vicariance in the origin of the biota on landmasses in the Indian Ocean. Due to their presumed (and partly demonstrated) low vagility, chameleons can also serve to analyse biogeographic patterns and processes on small scales. For such analyses, a wellresolved and taxon-rich phylogenetic hypothesis is a basic requirement. Yet, so far the published phylogenetic studies for these organisms suffer from low resolution, especially among basal branches, and from incomplete taxon coverage. The project proposed here will carry out a multilocus molecular phylogenetic analysis of chameleons, based on DNA sequences from multiple nuclear and mitochondrial genes, with a dense taxon sampling of at least 80% of all chameleon species. The phylogeny obtained will be dated using Bayesian molecular clock methods and will be used to test competing biogeographic scenarios. In concert with available georeferenced databases of chameleon distribution, we will identify geographic hotspots of chameleon species richness, endemism, and phylogenetic diversity. These patterns will be used to reconstruct historical diversification processes of chameleons, and to infer geographic priorities for nature conservation.

变色龙是一群蜥蜴，具有各种独特而壮观的形态特征。它们也是解释生物地理学问题的合适模型，例如印度洋陆地生物群起源中扩散或变异的相对重要性。由于变色龙被认为（并且部分被证明）的灵活性较低，因此它们还可以用于分析小规模的生物地理模式和过程。对于此类分析，一个基本要求是解决良好且富含分类单元的系统发育假说。然而，到目前为止，已发表的这些生物的系统发育研究分辨率低，特别是在基部分支中，并且分类单元覆盖不完整。这里提出的项目将基于多个核和线粒体基因的 DNA 序列，对变色龙进行多位点分子系统发育分析，并对至少 80% 的变色龙物种进行密集的分类采样。获得的系统发育将使用贝叶斯分子钟方法进行测定，并将用于测试竞争的生物地理场景。与现有的变色龙分布地理参考数据库相结合，我们将确定变色龙物种丰富度、特有性和系统发育多样性的地理热点。这些模式将用于重建变色龙的历史多样化过程，并推断自然保护的地理优先顺序。