滚下那座山:在欧洲木中沿着的环境梯度快速扩张的人口期间微地理适应分歧
Andrea Modica1, Hadrien Lalagüe2, Sylvie Muratorio3
1INRAE, URFM, 228, Route de l'Aérodrome, 84914, Avignon, France.
Heredity
|June 18, 2024
概括
最近的人口扩张并没有妨碍欧洲的当地适应. 持久的遗传变异支持微地理差异,在整个景观中保持森林遗传多样性.
科学领域:
- 森林遗传学 森林遗传学
- 进化生物学是进化的生物学.
- 人口基因组学是人口的基因组学.
背景情况:
- 森林树种群表现出高度的遗传多样性,使其能够适应当地环境.
- 历史上的人口变化,如人口收缩和扩张,可能会影响适应潜力.
- 了解最近的人口变化如何影响当地适应对于森林保护至关重要.
研究的目的:
- 调查最近的人口收缩和扩张事件对欧洲的当地适应的干扰.
- 研究密切相关的群体之间适应性分歧的模式,与对比的环境条件和最近的人口历史.
主要方法:
- 在欧洲种群中对全基因组单核酸多态 (SNP) 的分析.
- 在四个树木群中对对差异化分析,使用来自约9000个基因组区域的约35,000个SNP.
- 应用三个差异异异常值方法,考虑人口规模变化和人口历史.
主要成果:
- 在19个目标基因组区域中确定了27个选择性特征信号,表明了假定适应性分歧.
- 在所有对种群之间观察到适应性分歧,包括在旧生长区和最近殖民区之间的比较,以及在旧生长区内进行比较.
- 在短时间和生态梯度之间发现了适应信号,即使在长期稳定的种群中也是如此.
结论:
- 像扩张这样的最近的人口变化并不一定会阻碍森林树木的本地适应.
- 持久的遗传变异在促进局部微地理差异方面发挥着重要作用.
- 这些微地理差异过程有助于森林生态系统在景观层面维持遗传多样性.
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