权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

CAREER: A COMPARATIVE STUDY OF EXTRINSIC AND INTRINSIC ISOLATION IN KILLIFISH - USING STUDIES OF SPECIATION TO DEVELOP RESOURCES FOR TEACHING SPECIATION

职业生涯：鳉鱼外部和内部隔离的比较研究 - 利用物种研究开发物种教学资源

基本信息

批准号：
0953716
负责人：
Rebecca Fuller
金额：
$ 85.9万
依托单位：
University of Illinois at Urbana-Champaign
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2010
资助国家：
美国
起止时间：
2010-04-15 至 2017-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0953716&HistoricalAwards=false
关键词：
CAREER COMPARATIVE STUDY EXTRINSIC INTRINSIC

项目摘要

Because closely related species often differ in habitat, ecological differences could be important in speciation. The two possible mechanisms of ecological speciation are called extrinsic and intrinsic isolation. Extrinsic isolation occurs when hybrids that are intermediate in form cannot find appropriate habitat. Intrinsic isolation occurs when hybrids have reduced fitness regardless of habitat, that is, the problem has to do with internal factors such as hybrid physiology. The challenge is to determine which kind of isolation arose first and their relative contributions to allowing populations to continue towards being distinct species. For most animals, speciation takes too long to observe directly, but some can be caught in the process of speciation. Such species are ideal for making inferences about the order and magnitude of extrinsic and intrinsic isolation because populations can be studied at various stages of divergence, from recently diverged to completely unable to hybridize. This project focuses on ecological speciation among populations of killifish, which are ideal for studying ecological speciation because populations have diverged across a gradient from freshwater to saltwater multiple times. The PI will measure extrinsic and intrinsic isolation between freshwater and saltwater populations and compare the results with those from populations that are found in similar salinities. Teachers and biology education majors are incorporated into nearly all the proposed activities; they will conduct research and develop curriculum materials. The goal of the PI is to provide a thorough understanding of speciation through participation in research. A yearly seminar event will be held on teaching evolution to create an ongoing discussion between educators and scientists. Finally, a summer workshop will be held to educate local teachers about evolution and disseminate the curriculum materials developed through this project.

由于密切相关的物种往往在栖息地不同，生态差异在物种形成中可能是重要的。生态物种形成的两种可能机制称为外在隔离和内在隔离。当体型中等的杂交种找不到合适的栖息地时，就会发生外部隔离。当杂交种的适合度降低而与栖息地无关时，就会发生内在的隔离，也就是说，问题与杂交生理等内部因素有关。挑战是确定哪种隔离首先出现，以及它们对允许种群继续成为不同物种的相对贡献。对于大多数动物来说，物种形成需要太长的时间来直接观察，但有些动物可以在物种形成过程中被捕捉到。这类物种是推断外在和内在隔离的顺序和大小的理想工具，因为种群可以在不同的分化阶段进行研究，从最近的分化到完全不能杂交。这一项目的重点是千里鱼种群之间的生态物种形成，这是研究生态物种形成的理想选择，因为种群已经多次跨越从淡水到咸水的梯度。PI将测量淡水和咸水种群之间的外在和内在隔离，并将结果与类似盐度种群的结果进行比较。教师和生物教育专业的学生几乎参与了所有拟议的活动；他们将进行研究和开发课程材料。PI的目标是通过参与研究提供对物种形成的透彻了解。每年将举行一次关于教学进化论的研讨会活动，以在教育工作者和科学家之间创造一个持续的讨论。最后，将举办一次暑期讲习班，教育当地教师有关进化的知识，并传播通过该项目编制的课程材料。