DISSERTATION RESEARCH: What maintains species boundaries between interfertile, sympatric congeners? A test of prezygotic/postzygotic isolating mechanisms and cryptic hybridization

论文研究：是什么维持了不能生育的同域同类之间的物种界限？

• 批准号: 0709638
• 负责人: Graham Hatfull
• 金额: --
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-05-01 至 2009-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0709638&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; What; maintains; species

A critical goal of speciation research is to understand how reproductive barriers evolve among diverging lineages. Reproductive isolating barriers are predicted to increase with increasing divergence time among species and to be reinforced via natural selection against the production of unfit hybrid offspring. Thus, species that co-occur in natural communities are expected to have strong reproductive isolating barriers that prevent hybridization. Despite these predictions, many closely related plant species with weak reproductive barriers co-occur in nature. Two such species are Collinsia linearis and C. rattanii, which overlap in much of their range, flower at the same time, share pollinators, and readily hybridize in hand-pollination experiments. Thus, the proposed research uses these species as a model to better understand how such co-occurring species maintain their separate identities in the face of potential gene flow among the species. This work compliments research currently being conducted in the Kalisz lab by testing two prominent hypotheses on the evolution of reproductive barriers and mating system evolution. In addition, this project will benefit the research community using Collinsia as a model system (seven labs in North America), by expanding understanding of the evolution of isolating barriers and providing a broad-scale analysis of cross-species fertility, ecology, and biogeography in Collinsia.

物种研究的关键目标是了解生殖障碍如何在不同的谱系之间发展。 预计生殖隔离障碍会随着物种之间的差异时间的增加而增加，并通过自然选择来加强不合适的杂种后代。 因此，预计在自然社区中同时发生的物种将具有强大的生殖隔离障碍，以防止杂交。 尽管有这些预测，但许多与生殖屏障较弱的密切相关的植物物种本质上同时发生。 有两个这样的物种是collinsia linearis和C. rattanii，它们在其大部分范围内重叠，同时开花，共享授粉媒介，并很容易在手工授粉实验中杂交。 因此，拟议的研究将这些物种用作模型，以更好地了解这种同时发生物种在面对物种之间的潜在基因流中如何保持其独立的身份。 这项工作通过在Kalisz Lab中进行的研究来补充研究，该研究通过对生殖障碍和交配系统演变的进化进行了两个突出的假设。 此外，该项目将通过扩展对隔离障碍的发展并提供对Collinsia的跨物种生育能力，生态学和生物地理学的广泛分析，将使用Collinsia作为模型系统（北美的七个实验室）受益研究界（北美的七个实验室）。