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Comparative phylogeography of three woody species to infer vegetation history of the Patagonian steppe

三种木本植物的比较系统发育地理学推断巴塔哥尼亚草原的植被历史

基本信息

批准号：
212090009
负责人：
Dr. Frank R. Blattner
金额：
--
依托单位：
Leibniz-Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/212090009?language=en
关键词：
Comparative phylogeography three woody species

项目摘要

Patagonia, the southern-most part of South America, is an area where up to now very few phylogeographic studies of plants have been conducted. Thus, knowledge of vegetation history and hotspots of biodiversity is scarce. Two earlier studies found very similar phylogeographic patterns in four herbaceous species of the Patagonian steppe, the dominant vegetation unit of Patagonia east of the Andes. Within this project the phylogeography of three characteristic woody species of this vegetation unit will be analyzed. We will use sequences of the chloroplast genome and nuclear microsatellite loci as molecular markers to detect geo¬graphic patterns of genetic diversity. In addition we will use environmental niche modeling to characterize niche parameters and infer past species distribution. The main objective of this study is to infer if similar phylogeographic patterns indicate a common Pleistocene history of these species despite their ecological differences, or if the species reacted differently to past changing climate. By integrating the results of this study with that of the few earlier analyses of Patagonian steppe taxa it will be possible to reach a general understanding of the vege¬tation history of this plant community, particularly if steppe vegetation shifted its distribution as a unit or if the composition of the steppe changed repeatedly with Pleistocene climate changes.

巴塔哥尼亚位于南美洲的最南端，是一个迄今为止很少进行植物系统地理学研究的地区。因此，关于植被史和生物多样性热点的知识是稀缺的。早期的两项研究发现，巴塔哥尼亚草原（安第斯山脉以东巴塔哥尼亚的主要植被单元）的四种草本物种的系统地理模式非常相似。在本项目中，将分析该植被单元的三个特征木本物种的系统地理学。我们将利用叶绿体基因组序列和核微卫星位点作为分子标记来检测遗传多样性的地理格局。此外，我们将使用环境生态位模型来表征生态位参数并推断过去的物种分布。本研究的主要目的是推断相似的系统地理模式是否表明这些物种具有共同的更新世历史，尽管它们的生态差异，或者物种是否对过去变化的气候做出不同的反应。通过将本研究结果与早先对巴塔哥尼亚草原分类群的少量分析结果相结合，将有可能对该植物群落的植被历史有一个总体的了解，特别是如果草原植被作为一个整体改变了其分布，或者如果草原的组成随着更新世气候变化而反复变化。