不同生命阶段的变暖对宿主抵抗生态和进化有着不同的影响
Jingdi Li1,2, Cameron A Smith1, Jinlin Chen1
1Department of Biology, University of Oxford, Oxford, UK.
Ecology letters
|February 21, 2025
概括
气候变化带来的气温上升会影响宿主-病原体的动态. 在变暖下的宿主适应感染影响物种的生存,变暖诱导防御,但可能削弱遗传耐药性的进化.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 气候变化生物学 气候变化生物学
背景情况:
- 气候变化加剧了极端高温事件和疾病爆发.
- 宿主适应温度上升对于预测物种持久性至关重要.
- 了解热应激下的宿主-病原体相互作用至关重要.
研究的目的:
- 为了研究在不同宿主生命阶段应用的变暖如何影响Caenorhabditis elegans中耐药性的生态和进化动态.
- 为了确定在不同温度状态下的宿主-病原体系统中对抗性的选择性压力.
主要方法:
- 在受控条件下,在10个通道中竞争耐药和敏感的Caenorhabditis elegans基因型.
- 追踪了暴露于不同变暖情景的宿主群体内的耐药性的传播和维持.
- 评估了宿主发育阶段和温度压力对防御机制和抵抗进化的作用.
主要成果:
- 长时间的变暖和感染强烈选择了耐药宿主基因型.
- 宿主发育期间的变暖诱导了塑料防御,减少了昂贵的遗传抵抗的选择.
- 在环境和周期性变暖条件下,阻力会丧失.
- 稀释效应,即耐药宿主减少了病原体的传播,削弱了在环境温度下耐药性的选择.
结论:
- 主体耐药性的进化动态是由病原体毒性,遗传耐药性成本,稀释效应和温度诱导的塑料防御的复杂相互作用形成的.
- 宿主适应气候变化涉及遗传抵抗和环境诱导的塑料反应.
- 在气候变化下物种的持久性取决于这些因素在宿主-病原体系统中的平衡.
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