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DISSERTATION RESEARCH: Shifting climates and stable niches: Assessing the impact of ancient climate cycles on phylogeographic structure within three Andean marsupials

论文研究：气候变化和稳定的生态位：评估古代气候循环对三种安第斯有袋动物系统发育地理结构的影响

基本信息

批准号：
1110365
负责人：
Sharon Jansa
金额：
$ 1.5万
依托单位：
University of Minnesota-Twin Cities
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2011
资助国家：
美国
起止时间：
2011-06-01 至 2013-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1110365&HistoricalAwards=false
关键词：
DISSERTATION RESEARCH Shifting climates stable

项目摘要

This study investigates how extreme climate fluctuations of the Ice Ages over the past several hundred thousand years might have affected the geographic distributions, genetic structure, and diversity of species. Theory suggests that fluctuating climates may have acted as a force promoting diversification. To better understand the specific effects of ancient climate fluctuations on the diversification of species, this project focuses on a group of marsupials (Thylamys opossums) that live in the Andes Mountains of South America. Genetic data and computational tools will be used to make inferences about events that occurred in the distant past. With this genetic evidence in hand, hypotheses concerning the impact of ancient climate change on species diversity can be tested.Only a handful of studies have examined the evolutionary patterns of Andean mammals in the context of ancient climate fluctuations, and prior to this work, none has considered these factors for Thylamys species. This project is significant and distinct from previous efforts because it will explicitly test alternative evolutionary hypotheses using multiple types of genetic data, ecological models of each population's geographic distribution, and sophisticated computational tools. When complete, this project will illustrate from multiple perspectives the impact of climatic shifts on biodiversity in Thylamys. Finally, the species considered here live in a biodiversity hotspot (the Tropical Andes), and a clear understanding of genetic patterns for this group can be used to guide localized conservation strategies for this unique group of mammals.

这项研究调查了过去数十万年来冰河时代的极端气候波动可能如何影响物种的地理分布、遗传结构和多样性。理论表明，波动的气候可能起到了推动多元化的作用。为了更好地了解古代气候波动对物种多样性的具体影响，该项目重点研究了生活在南美洲安第斯山脉的一群有袋类动物(袋鼠)。基因数据和计算工具将被用来对遥远的过去发生的事件做出推断。有了这些遗传证据，有关古代气候变化对物种多样性影响的假说就可以得到验证。只有少数几项研究考察了古代气候波动背景下安第斯哺乳动物的进化模式，在这项工作之前，没有人考虑过胸肌物种的这些因素。这个项目意义重大，与以前的努力截然不同，因为它将使用多种类型的遗传数据、每个种群地理分布的生态模型和复杂的计算工具来明确测试替代的进化假说。该项目完成后，将从多个角度说明气候变化对Thylamys生物多样性的影响。最后，这里考虑的物种生活在生物多样性热点(热带安第斯山脉)，对这一群体遗传模式的清楚了解可以用来指导这一独特群体的本地化保护战略。