DISSERTATION RESEARCH: Tests of parallel divergence processes in montane plants: links between population differentiation and species diversity patterns

论文研究：山地植物平行分化过程的测试：种群分化与物种多样性模式之间的联系

• 批准号: 1309072
• 负责人: L. Lacey Knowles
• 金额: $ 2.02万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1309072&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Tests; parallel; divergence

How did the cyclical advance and retreat of glaciers affect biodiversity within mountainous regions? How do environmental gradients and geography influence the current structure of diversity within species across their ranges? Researchers will address these questions by utilizing hundreds of DNA sequences from six closely related plant species native to the mountains of western North America. Analytical modeling techniques will allow them to determine if speciation events occurred uniformly among pairs of sister species or if they occurred under a variety of different scenarios. Subsequently, researchers will determine if glaciations that dramatically altered montane landscapes and suitable habitat during the Pleistocene Epoch (from 2,600,000 to 20,000 years ago) impacted species? distributions randomly or predictably. Finally, researchers will investigate if the current molecular variation within each of the species is distributed along environmental gradients (for example, the change in temperature between a valley floor and a mountaintop), by geography, or from the shifting of habitats during glaciations. Knowledge gained from these analyses will help researchers understand how biodiversity was created in the mountains. It will also help elucidate the relative importance of climatic stability versus specific environmental and geographic conditions in structuring the distribution of molecular diversity within species.Organisms living in montane ecosystems are facing an uncertain future as climate change alters temperature and precipitation regimes. Many montane organisms will be forced to move upslope as lower elevations become warmer and drier, and organisms already restricted to the highest elevations may die off because suitable habitat will no longer exist. Knowing what environmental variables influence the distributions of plants across the landscape will allow land managers and conservationists to counteract declines in species? population sizes. This research will inform professionals about how habitat suitability will change across the landscape, and help them to determine from where to source plant material in order to have the best results for reintroduction or assisted migration efforts. In summary, the results will contribute information relevant to preserving biodiversity across montane landscapes by highlighting how individual species are sensitive to different environmental conditions.

冰川的周期性进步和撤退如何影响山区的生物多样性？环境梯度和地理如何影响其范围内物种内多样性的当前结构？研究人员将通过利用来自北美西部山脉的六种密切相关植物物种的数百种DNA序列来解决这些问题。分析建模技术将使他们能够确定成对物种之间是否统一发生形成事件，还是在各种不同的情况下发生。随后，研究人员将确定在更新世时期（从2,600,000到20，000年前）在更改山地景观和合适栖息地的冰川是否影响物种？随机或可预测的分布。最后，研究人员将研究每个物种内部的当前分子变化沿环境梯度分布（例如，山谷地板和山顶之间的温度变化），地理位置上的温度变化，还是从冰川期间的栖息地转移。从这些分析中获得的知识将有助于研究人员了解如何在山上创造生物多样性。它还将有助于阐明气候稳定性与特定环境和地理条件在构建物种内分子多样性分布方面的相对重要性。随着气候变化的改变，生活在蒙塔尼生态系统中的有机体面临着不确定的未来。随着较低的海拔越温暖和干燥，许多山地生物将被迫向上移动，并且已经仅限于最高海拔的生物可能会消失，因为不再存在合适的栖息地。知道哪些环境变量会影响植物在整个景观中的分布将使土地管理者和保护主义者抵消物种下降的下降？人口规模。这项研究将为专业人员提供有关栖息地如何在整个景观中发生变化的信息，并帮助他们确定从哪里来源的植物材料，以便获得重新引入或辅助移民工作的最佳结果。总而言之，结果将通过强调单个物种对不同环境条件敏感的方式来贡献与保护跨蒙塔尼景观的生物多样性有关的信息。