DISSERTATION RESEARCH: Trajectories of Genetic Change in Populations With Different Founding Sizes: Time Transects of Daphnia Populations in Two Upstate New York Lakes

论文研究：不同创始规模种群的遗传变化轨迹：纽约州北部两个湖泊水蚤种群的时间横断面

• 批准号: 0205828
• 负责人: Nelson Hairston
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0205828&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Trajectories; Genetic; Change

Long-term effects of population reductions on genetic diversity are well understood, but few studies have examined short-term changes in genetic diversity in populations immediately after they have been founded. The goal of this project is to compare changes in genetic diversity in three species of the grazing zooplankter Daphnia that recolonized a lake from a small number of founding individuals with a fourth population that was founded by a large number of individuals. Long-lived dormant Daphnia eggs in sediments record annual changes in populations that can be reconstructed from sediment cores. Genetic diversity of each of the four "populations" at several time points following recolonization will be measured to assess changes as the populations recovered in size.Daphnia species are a key component of aquatic ecosystems, serving as a control on algae and a food source for fish. The ability of a population to respond to environmental changes depends on the level of genetic diversity present. This study will thus provide important insights into how Daphnia respond to environmental change and influence community and ecosystem processes. It will also provide empirical tests of theoretical models and contribute to our knowledge about how genetic diversity is maintained in natural populations, which in turn will foster more appropriate management or conservation plans.

种群减少对遗传多样性的长期影响已广为人知，但很少有研究在种群形成后立即研究种群遗传多样性的短期变化。 该项目的目标是比较三种食草浮游动物水蚤的遗传多样性变化，这些水蚤由少数创始个体重新定居在一个湖泊中，而第四个种群则由大量个体建立。 沉积物中长期休眠的水蚤卵记录了种群的年度变化，这些变化可以从沉积物岩心重建。 将测量重新定殖后几个时间点的四个“种群”中每一个的遗传多样性，以评估种群规模恢复时的变化。水蚤物种是水生生态系统的关键组成部分，作为藻类的控制者和水蚤的食物来源。鱼。 种群对环境变化做出反应的能力取决于遗传多样性的水平。 因此，这项研究将为水蚤如何响应环境变化并影响群落和生态系统过程提供重要见解。 它还将为理论模型提供实证检验，并有助于我们了解如何在自然种群中维持遗传多样性，这反过来又将促进更适当的管理或保护计划。