150公里的开放海上足够吗? 蝙蝠授粉的柱状仙人掌中的基因流和种群差异化
Sebastián Arenas1,2, Alberto Búrquez2, Enriquena Bustamante2
1DIADE, Université de Montpellier, IRD, Montpellier, France.
PloS one
|June 29, 2023
概括
巴哈加利福尼亚半岛的半岛.
科学领域:
- 进化生物学是进化的生物学.
- 人口遗传学 人口遗传学
- 植物地理学 植物地理学
背景情况:
- 基因结构和植物地理模式是由基因流和隔离形成的.
- 加利福尼亚湾是一个重要的海洋屏障,影响了物种进化.
- 柱状仙人掌Stenocereus thurberi (OPC) 是一种长寿物种,在大陆和半岛有种群.
研究的目的:
- 为了调查巴哈加利福尼亚半岛的分离对Stenocereus thurberi进化的影响.
- 为了评估跨越加利福尼亚湾屏障的基因流量的程度.
- 了解大陆和半岛OPC种群中的遗传多样性和结构.
主要方法:
- 来自十二个Stenocereus thurberi种群的叶绿体DNA序列的分析.
- 对遗传多样性 (Hd) 和遗传结构 (GST) 的评估.
- 祖先单双型的重建和利基模型.
主要成果:
- 大陆人口的遗传多样性 (Hd = 0.81) 和遗传结构 (GST = 0.143) 比半岛人口 (Hd = 0.71,GST = 0.358) 更高.
- 半岛群体的隔离程度与大陆群体相比,但在海湾地区有着共同的单元型,这表明了基因流动.
- 利基模型表明,在最后一个冰川最大时期,人口收缩,随后是当前的扩张和分歧,尽管基因流正在持续,可能是由蝙蝠介导的.
结论:
- 巴哈加利福尼亚半岛的分离已经影响了Stenocereus thurberi的进化,但加利福尼亚湾的基因流动仍然存在.
- 虽然可能存在代理性,但半岛群体可能起源于大陆基因流,在两个地区都有独特的单元类型.
- 尽管基因不断流动,但Stenocereus thurberi种群在遗传上有所分歧,大陆种群的结构不如半岛种群那么结构化.
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