The Role of Sexual Selection in the Loss of a Sexually Selected Male Trait

性选择在性选择男性特征丧失中的作用

• 批准号: 0316687
• 负责人: Molly Morris
• 金额: $ 45万
• 依托单位: Ohio University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0316687&HistoricalAwards=false
• 关键词: Role; Sexual; Selection; Loss; Sexually

The role of sexual selection in the loss of a sexually selected male traitMolly R. Morris The role of sexual selection (female mating preferences and male-male competition for mates) in producing exaggerated or conspicuous male traits has been well documented, and yet recent comparisons of closely related species have suggested that loss of these male traits may be more common than gains. This project examines the roles of both male-male competition and female choice in the loss of the pigment pattern "vertical bars" found across several species of Xiphophorus fishes. By comparing the responses of males and female to the bars in closely related species it will be possible to determine when the bars were lost in relation to the loss of female preference and male response. The reliability of comparative studies ultimately depends on the reliability of the information about the relationships among the species. Therefore, this project will resolve the relationships within this group of fishes by comparing extensive DNA sequence data for all 22 species of this model system of fishes. This project will provide training for one postdoctoral fellow, two graduate students and one undergraduate student at Ohio University, as well as invitations to students at the Instituto de Biologia in Mexico City to go on field trips.

性选择在性选择雄性性状丧失中的作用莫利·R·莫里斯性选择(雌性交配偏好和雄性对配偶的竞争)在产生夸张或明显的男性特征方面的作用已经被很好地记录下来，然而最近对近亲物种的比较表明，这些男性特征的丧失可能比获得更常见。这个项目研究了雄-雄竞争和雌性选择在剑尾鱼几种鱼类中发现的色素图案“垂直条”的丧失中所起的作用。通过比较雄性和雌性在密切相关物种中对条带的反应，可以确定条带何时丢失与雌性偏好和雄性反应的丧失有关。比较研究的可靠性最终取决于有关物种间关系的信息的可靠性。因此，这个项目将通过比较这一模式系统中所有22种鱼的广泛DNA序列数据来解决这一组鱼之间的关系。该项目将为俄亥俄大学的一名博士后研究员、两名研究生和一名本科生提供培训，并邀请墨西哥城生物学院的学生进行实地考察。