Dissertation Research: An Analysis of the Speciation Process in Cave Spiders of the Genus Nesticus

论文研究：巢蛛属洞穴蜘蛛的物种形成过程分析

• 批准号: 9213184
• 负责人: Alan Templeton
• 金额: $ 1万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-12-15 至 1995-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9213184&HistoricalAwards=false
• 关键词: Dissertation; Research; Analysis; Speciation; Process

This research utilizes complementary phylogenetic and population genetic information to infer modes of speciation in the cave spider Nesticus. The nesticid spiders of the Appalachian region are a recently diverged, species-rich lineage that provides an excellent system for studying both the geographic and populational contexts of speciation. The sister-species relationships of Nesticus will be estimated, and in combination with biogeographic evidence from other cavernicolous clades, will define how historical geology and geomorphology have influenced patterns of taxonomic diversity. To complete the analysis, research efforts will be directed at assessing how the population genetic attributes of the species under study might have influenced the speciational process. To this end, the ancestral population structure of phylogenetically defined parental species will be characterized, along with the type of sampling event which gives rise to daughter species. This historical inference will be derived from a comparative analysis of the amount, the rate of change, and the geographic pattern of genetic variation for mtDNA and nuclear DNA genetic systems.

这项研究利用互补的系统发育和种群遗传信息来推断洞穴蜘蛛Nesticus的物种形成模式。阿巴拉契亚地区的筑巢蜘蛛是一个最近分化的物种丰富的谱系，为研究物种形成的地理和种群背景提供了一个极好的系统。Nesticus的姐妹种关系将被估计，并与来自其他洞穴分支的生物地理证据相结合，将定义历史地质学和地貌如何影响分类多样性的模式。为了完成分析，研究工作将针对评估被研究物种的种群遗传属性可能如何影响物种形成过程。为此，将描述亲本物种的祖先种群结构，以及产生子代物种的抽样事件的类型。这一历史推论将通过对线粒体DNA和核DNA遗传系统的遗传变异的数量、变化率和地理模式的比较分析而得出。