The Genetic Consequences of Long Generation Times

长世代的遗传后果

• 批准号: 9727161
• 负责人: H. Bradley Shaffer
• 金额: $ 15万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9727161&HistoricalAwards=false
• 关键词: Genetic; Consequences; Long; Generation; Times

Shaffer 9727161 This research program uses the analysis of DNA sequence variation to quantify levels of population differentiation in freshwater and terrestrial turtles from three continental regions: the central United States, the western and northern Amazon basin, and eastern Australia. In each of these regions, there have been severe climate changes during the past 15,000 years, and these changes have had impacts on the past and current distribution of all plants and animals, including turtles. For example, about 17,000 years ago most of North Dakota and Minnesota were under glacial ice, whereas today they are fully inhabited by species that have migrated north from warmer areas. DNA sequence data from at least two genes will be used to quantify the extent of these post-glacial migration patterns, focussing on turtles because they have very long generation times, and should show the maximal impacts of these past events in their current populations. More generally, these data will provide information on how one can use molecular genetic data from long-lived species to understand levels of migration, population fluctuations, and population stability. Such data are frequently utilized in disciplines ranging from conservation and managment to basic ecology and evolution, and they hinge on the assumption that past climatic fluctuations have has a negligable impact on current populations. These data will inform us on whether such assumptions are valid, or are in need of revision.

谢弗9727161 这项研究计划使用的DNA序列变异的分析，以量化的淡水和陆地龟从三个大陆地区的人口分化水平：美国中部，西部和北方亚马逊盆地，和澳大利亚东部。 在过去的15,000年里，这些地区都发生了严重的气候变化，这些变化对过去和现在所有动植物的分布产生了影响，包括海龟。 例如，大约17,000年前，北达科他州和明尼苏达州的大部分地区都在冰川之下，而今天，它们完全由从温暖地区向北迁移的物种居住。 来自至少两个基因的DNA序列数据将用于量化这些冰川后迁移模式的程度，重点是海龟，因为它们的世代时间很长，并且应该显示这些过去事件对其当前种群的最大影响。 更一般地说，这些数据将提供如何使用长寿物种的分子遗传数据来了解迁移水平，种群波动和种群稳定性的信息。 这些数据经常用于从保护和管理到基本生态学和进化的学科，它们取决于过去的气候波动对当前人口产生不可否认的影响的假设。 这些数据将告诉我们这些假设是否有效，或者是否需要修改。