RADseq数据揭示了四种熟悉的北美歌鸟的广泛历史侵入
Linda A Lait1, Juan Enciso-Romero1, Thilini T M Lekamlage1
1Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, Canada.
Evolution; international journal of organic evolution
|January 27, 2024
概括
今天,北美的基因侵入是有限的,但在历史上是广泛的,特别是在落基山脉以西. 研究多个物种揭示了与基因流动模式的复杂分歧.
科学领域:
- 人口遗传学 人口遗传学
- 进化生物学是进化的生物学.
- 鸟类学 鸟类学是一门学科.
背景情况:
- 人口的遗传结构是由历史和当代因素塑造的,包括基因流动.
- 杂交和内进化在相关物种中很常见,但推断历史事件可能具有挑战性.
研究的目的:
- 调查四种北美种当代和历史内入侵的程度和模式.
- 区分物种对杂交事件的特定贡献,并了解复杂的分歧模式.
主要方法:
- 使用限制部位相关的DNA测序 (RADseq) 进行高通量基因型定型.
- 利用贝叶斯聚类和主要成分分析 (PCA) 来评估当代的基因流.
- 应用f4统计和混合图模型来推断历史的内进事件.
主要成果:
- 贝叶斯聚类和PCA表明,在四种种中,在同情型和全情型种群中,基因流动有限.
- f4统计和混合图显示了显著的历史内进,主要是在落基山脉以西的人口中.
- 落基山以西的大多数种群 (不包括沿海/岛屿) 显示出历史混合的证据,突出显示了与基因流动的复杂分歧.
结论:
- 当代杂交是有限的,但历史上的内入行为在塑造种群的遗传结构方面发挥了重要作用.
- 地理结构,特别是落基山脉以西的地理结构,是历史混合事件的关键因素.
- 分析多个密切相关的物种对于准确推断进化动态和进化史至关重要.
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