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城市化是否改变了净化选择? 挖洞猫头的一个案例研究
Aude E Caizergues1,2,3
1Centre for Urban Environments, University of Toronto Mississauga, Mississauga, ON L5L 1C6, Canada.
Integrative and comparative biology
|June 5, 2025
概括
城市化影响了野生动物的进化,尽管保持了遗传多样性,但城市挖掘猫头的净化选择减少了. 这表明城市化可能会削弱城市环境中的自然选择.
科学领域:
- 进化生物学是进化的生物学.
- 城市生态学 城市生态学
- 基因组学就是基因组学.
背景情况:
- 城市化是一个主要的人为干扰,改变生态系统和进化过程.
- 城市环境面临着独特的挑战,可能会影响自然选择和遗传漂移.
- 城市化对选择强度和遗传漂移的影响仍然不清楚,特别是在遗传多样性维护方面.
研究的目的:
- 调查城市化对遗传漂移的影响以及挖洞猫头 (Athene cunicularia) 净化选择力.
- 为了确定城市人口是否由于增加漂移或减少选择而积累有害突变.
- 为了比较城市和农村挖洞猫头种群之间的净化选择的强度.
主要方法:
- 利用阿根廷复制的城市和农村挖洞猫头种群发表的基因组数据集.
- 评估了有害多样性与中性多样性的全基因组比例,以检测突变积累.
- 计算了分离突变的适应性影响的分布,以测量净化选择强度.
主要成果:
- 城市挖洞猫头保持了与农村人口相比的核酸多样性,尽管有效人口规模较小.
- 在城市人口中没有发现有害突变积累的证据,这表明遗传漂移的影响有限.
- 与农村人口相比,城市人口的净化选择强度显著降低 (超过50%较弱).
结论:
- 城市化似乎并没有大大增加遗传漂移,也没有在挖洞猫头中引起突变积累.
- 在城市环境中,净化选择的强度明显减少,可能是由于缓冲条件或遗传漂移.
- 城市化显著塑造了进化过程,导致了城市自然选择的潜在削弱.
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