在人口和环境随机性下的进化救援
Kuangyi Xu1, Todd J Vision1, Maria R Servedio1
1Department of Biology, University of North Carolina, Chapel Hill, North Carolina, USA.
Journal of evolutionary biology
|September 30, 2023
概括
人口和环境的随机性对人口的生存有不同的影响. 了解这些独特的影响对于预测和管理在不断变化的环境中进化救援至关重要.
科学领域:
- 进化生物学是进化的生物学.
- 生态生态学 生态生态学
- 人口遗传学 人口遗传学
背景情况:
- 种群面临随机变化的两个主要来源:人口随机性 (个人生存和繁殖的随机性) 和环境随机性 (环境条件的随机波动影响人口增长).
- 这些随机过程可以影响人口适应和持久的能力,特别是在环境变化期间.
研究的目的:
- 模拟和比较人口和环境随机性对环境变化后人口生存和进化的影响.
- 研究遗传变异和稳定选择的强度如何与不同类型的随机性相互作用.
- 确定对进化救援策略的影响.
主要方法:
- 现型选择建模用于模拟对环境突然变化的进化反应.
- 该研究分析了不同程度的人口和环境随机性的基因和人口动态.
- 人口生存概率在基因变异和选择强度的关系下进行了评估.
主要成果:
- 在人口随机性下,人口生存概率随着更强的稳定选择而急剧下降,而在环境随机性下,它下降的速度更为缓慢.
- 人口生存的最佳遗传差异显示了人口和环境随机性之间的最小差异.
- 人口随机性的影响在较小的种群中被放大,需要缓慢的初始遗传变异下降才能持续存在.
- 环境随机性的人口规模独立的影响优先考虑更高的生存初始适应性.
结论:
- 明确区分和测量人口与环境随机性对于准确预测进化救援至关重要.
- 这些随机性类型之间的相互作用可能是协同作用的,进一步减少了人口的生存率.
- 危种群的管理策略必须考虑影响其持久性的特定类型的随机性.
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