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广泛分布的北美歌鸟的神秘物种之间的基因组分歧和内进
Kenneth K Askelson1, Garth M Spellman2, Darren Irwin1
1Biodiversity Research Centre and Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada.
Molecular ecology
|November 2, 2023
概括
基因组分析显示,尽管外表相似,但白胸 (Sitta carolinensis) 至少有三种不同的物种. 幽灵血统的入侵影响了洛基山区的人口分歧,突出了神秘的物种化.
科学领域:
- 进化生物学 进化生物学
- 基因组学就是基因组学.
- 鸟类学 鸟类学是一门学科.
背景情况:
- 隐秘的物种化可以发生在具有相似形态的广泛分布的物种中.
- 怀疑白胸 (Sitta carolinensis) 是一种神秘物种化的案例.
- 之前的遗传研究表明不同的群体,但生殖隔离仍然不清楚.
研究的目的:
- 通过使用基因组数据,调查白胸是否包括多个物种.
- 为了确定不同种群之间的生殖隔离和侵入程度.
- 了解基因组变异在白胸的物种化中的作用.
主要方法:
- 广泛的基因组采样超过350个白胸在北美.
- 利用一种新的染色体水平参考基因组进行分析.
- 分析了超过30万个位置的基因组变异.
主要成果:
- 确定了四个高度差异化的种群:太平洋,东部,落基山脉北部和落基山脉南部.
- 观察到落基山群体之间的中度混合,以及与东部群体的有限杂交.
- 发现了一种幽灵血统侵入落基山脉南部人口的证据.
结论:
- 白胸应该被认为是至少三种不同的物种.
- 幽灵血统的内入行为在区分洛基山区人口方面发挥了作用.
- 不同的繁殖隔离水平说明了在形态上相似的物种中特种连续性的例子.
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