CRB: Collaborative: The Importance of Hybridization in the Evolution and Ecology of Carpobrotus Species in California

CRB：协作：杂交在加州 Carpobrotus 物种进化和生态学中的重要性

• 批准号: 9322795
• 负责人: Carla D'Antonio
• 金额: $ 4.98万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-01 至 1996-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9322795&HistoricalAwards=false
• 关键词: CRB; Collaborative; Importance; Hybridization; Evolution

9322795 D'Antonio The widespread occurrence of biological invasions offers the opportunity to study changes in the dynamics and genetics of populations and the ecological effects of those changes. Such changes are important in light of the increasing mixing and homogenization of the world's species and habitats. This study will address the evolutionary and ecological importance of genetic changes resulting from hybridization between two closely related plant species which have recently come into contact as a result of human activity. Carpobrotus edulis is an aggressive South African perennial introduced into California in the early 1900's where it invades coastal dune, grassland and scrub habitats. Carpobrotus chilensis is a less aggressive species that was common throughout California before the introduction of C. edulis. It exhibits little competitive pressure on native dune species. In this study, the investigators will combine genetic techniques and field experiments to establish the extent to which hybridization is occurring between these species and examine the effect of hybridization and introgression on morphological, ecological and fitness characteristics important to successful establishment and invasion. Also, some of the community-level consequences of hybridization will be identified. %%% The historical separation of these species provides the ideal system in which to measure gene flow and corresponding changes in fitness and ecological adaptation. The results of this study will contribute to understanding the impact of hybridization on the genetic integrity of native species and the conservation of native ecosystems.

9322795 D'Antonio生物入侵的广泛发生提供了研究人口动态和遗传学的变化以及这些变化的生态影响的机会。鉴于世界物种和栖息地的混合和均匀化的增加和同质化，这种变化很重要。这项研究将解决由于人类活动最近接触的两个密切相关的植物物种之间杂交引起的遗传变化的进化和生态重要性。 Carpobrotus Edulis是1900年代初期引入加利福尼亚州的南非多年生多年生多年生，它入侵了沿海沙丘，草原和磨砂栖息地。 Carpobrotus Chilensis是一种不那么侵略性的物种，在引入C. edulis之前，在整个加利福尼亚州都是常见的。它对本地沙丘物种几乎没有竞争压力。在这项研究中，研究人员将结合遗传技术和现场实验，以确定这些物种之间发生杂交的程度，并检查杂交和渗入对成功建立和入侵至关重要的形态，生态和适应性特征的影响。此外，还将确定一些社区级别的杂交后果。 这些物种的历史分离提供了一种理想的系统，可以在其中测量基因流以及适应性和生态适应的相应变化。这项研究的结果将有助于理解杂交对天然物种遗传完整性和天然生态系统的保护的影响。