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Dissertation Research: A Molecular Phylogenetic Study of Geographic Genetic Variation and Speciation in Salamanders of the Eurycea bislineata species complex

论文研究：Eurycea bislineata 物种复合体蝾螈地理遗传变异和物种形成的分子系统发育研究

基本信息

批准号：
0206739
负责人：
Allan Larson
金额：
$ 1.06万
依托单位：
Washington 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：
2002-06-01 至 2005-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206739&HistoricalAwards=false
关键词：
Dissertation Research Molecular Phylogenetic Study

项目摘要

For stream-associated organisms with limited dispersal abilities, the historical connections among streams generate predictions about genetic interactions among populations and routes of dispersal between drainage systems. We use the temporal and spatial variation present in mitochondrial gene lineages to investigate the relationship between the geological history of stream drainages and geographic genetic fragmentation in plethodontid salamanders of the Eurycea bislineata species complex. Plethodontid salamanders of the Eurycea bislineata species complex are common in streams throughout the Interior Lowland, Appalachian Highland, Piedmont and Coastal Plain physiographic provinces of eastern North America. Intensive research on the plethodontid salamander fauna of eastern North America has uncovered high levels of genetic structuring among populations and numerous cryptic species in this group, whose endemism and species diversity are greater in the southern Appalachian Mountains than any other region in the United States. Our research provides insight into the historical factors affecting diversification in this species-rich group of vertebrates. At a broader level, this research has implications for understanding factors that generate and maintain biodiversity in stream-associated organisms of eastern North America.

对于扩散能力有限的溪流相关生物，溪流之间的历史联系产生了关于种群之间的遗传相互作用和排水系统之间的扩散路线的预测。我们利用线粒体基因谱系中存在的时间和空间变异来研究溪流排泄的地质历史与双线甲属物种复合体中多齿类火蜥蜴地理遗传片段化之间的关系。在北美东部的内陆低地省、阿巴拉契亚高地省、山前省和沿海平原省的溪流中，常见的是双线眼线亚目物种复合体中的Plethodontids火蜥蜴。对北美东部的多齿火蜥蜴动物群的深入研究发现，这一群体中的种群和许多神秘物种之间存在高度的遗传结构，其特有特性和物种多样性在阿巴拉契亚山脉南部比美国任何其他地区都要大。我们的研究为影响这一物种丰富的脊椎动物群体多样化的历史因素提供了洞察力。在更广泛的层面上，这项研究对理解在北美东部与河流相关的生物中产生和维持生物多样性的因素具有意义。