权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The role of tectonics and environment on the distribution of dinosaur diversity

构造和环境对恐龙多样性分布的作用

基本信息

批准号：
2547175
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2547175
关键词：
role tectonics environment distribution dinosaur

项目摘要

Dinosaurs first appeared approximately 230 million years ago and rapidly became globally distributed. However, it is currently unknown where on Earth they first appeared, and what effect the breakup of the super-continent Pangaea had on their diversity and distribution. Determining the impact of Pangaean fragmentation on the distribution of life is one of the central goals of biogeography, but fierce debate and uncertainty plagues this field. To quantitatively evaluate dinosaurian evolutionary and biogeographic history, I will infer a timecalibrated supertree of the group's evolutionary relationships and use this alongside an existing dataset of dinosaur fossil occurrences. I will then apply a series of state-of-the-art analytical methods, including sampling standardisation, network analysis, and Likelihood (BioGeoBEARS) and Bayesian (PyRate) approaches. Information on sampling biases (e.g. areas that lack suitable sedimentary rocks for preserving dinosaurs) and palaeogeographic/environmental barriers and filters to dispersal (e.g. published data from past continental configurations and palaeoclimatic models) will also be incorporated into analyses, factors that have largely been ignored in previous studies. These analyses will enable me to evaluate the relative roles of vicariance and dispersal on the distribution of dinosaurs through time, including testing whether some clades likely underwent transoceanic dispersal.

恐龙最早出现在大约2.3亿年前，并迅速分布在全球各地。然而，目前尚不清楚它们最早出现在地球的什么地方，也不知道超级大陆盘古大陆的解体对它们的多样性和分布产生了什么影响。确定盘古岛碎片化对生命分布的影响是生物地理学的中心目标之一，但激烈的辩论和不确定性困扰着这一领域。为了定量评估恐龙的进化和生物地理历史，我将推断出该群体进化关系的时间校准超树，并将其与现有的恐龙化石发生数据集一起使用。然后，我将应用一系列最先进的分析方法，包括抽样标准化、网络分析、似然(BioGeoBEARS)和贝叶斯(Pyrate)方法。有关取样偏差(例如，缺乏适合保存恐龙的沉积岩的地区)和扩散的古地理/环境障碍和过滤器(例如，来自过去大陆配置和古气候模型的已公布数据)的信息也将纳入分析，这些因素在以前的研究中基本上被忽视。这些分析将使我能够评估进化和扩散对恐龙随时间分布的相对作用，包括测试一些支系是否可能经历了跨洋扩散。