选择性掠食对感染流行率和宿主敏感性的影响
Stephanie O Gutierrez1,2, Ximena E Bernal1,3, Catherine L Searle1
1Department of Biological Sciences Purdue University West Lafayette Indiana USA.
Ecology and evolution
|January 22, 2025
概括
选择性掠食影响宿主-寄生虫的动态. 食用未感染宿主的捕食者可以增加感染流行率并推动宿主进化,挑战关于疾病控制的典型假设.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 寄生虫学的寄生虫学
背景情况:
- 捕食对生态过程产生重大影响,包括宿主-寄生虫相互作用.
- 选择性掠食,捕食者准特定的猎物,可以改变猎物种群和进化压力.
- 虽然许多研究重点关注食用感染猎物的捕食者,但有些捕食者更喜欢食用未感染的个体,从而对宿主-寄生虫动态产生不同的影响.
研究的目的:
- 研究不同类型的选择性掠食 (感染,未感染或随机猎物) 如何影响宿主-寄生虫感染动态和宿主进化.
- 了解捕食者猎物选择性策略对宿主健康和寄生虫传播的影响.
主要方法:
- 使用了实验室模型系统:Daphnia dentifera感染了Metschnikowia bicuspidata真菌.
- 人工操纵的选择性掠食通过移除感染,未感染或随机选择的猎物超过8-9代.
- 每周和实验后监测人口人口统计,感染流行率和宿主易感性.
主要成果:
- 在6周后,在掠食治疗中没有观察到宿主丰度或整体感染患病率的显著差异.
- 与直觉相反,对受感染个体进行选择性掠食的种群显示出更高的感染宿主数量.
- 在对未感染个体进行选择性掠食的种群中,在标准化寄生虫暴露后,宿主对感染的敏感性增加.
结论:
- 选择性掠食策略可以意外地改变感染宿主的丰富性,并影响宿主进化.
- 掠食者优先食用未感染的猎物,可能无意中增加疾病的流行率,并推动宿主群体的适应性进化.
- 了解捕食者选择性对于预测宿主-寄生虫动态和进化轨迹至关重要.
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