掠食风险通过特征介导的间接影响增加了对寄生虫的易感性
Colin D MacLeod1, Lien T Luong2
1Department of Biological Sciences, University of Alberta, CW405 Biological Sciences Building, Edmonton, AB, T6G 2E9, Canada.
Oecologia
|May 6, 2025
概括
面临多种威胁的生物可能会优先避免捕食者,从而导致寄生虫感染率更高. 这项研究表明,Drosophila nigrospiracula在避免蜘蛛时增加了寄生虫的风险,影响了生态动态.
科学领域:
- 生态生态学 生态生态学
- 行为生态学 行为生态学
- 进化生物学 进化生物学
背景情况:
- 生物在对自然敌人的反应中改变行为,可能会影响其他健康特征.
- 多种捕食者和寄生虫为猎物物种创造了复杂的风险评估场景.
- 通过特征介导的间接效应发生在一种威胁的防御行为增加了对另一个威胁的脆弱性时.
研究的目的:
- 研究Drosophila nigrospiracula如何应对掠食者和寄生虫的同时威胁.
- 为了确定在面临多种风险时是否优先考虑反捕食者或反寄生虫行为.
- 检查这些权衡对感染和掠食率的影响.
主要方法:
- 对捕食者 (跳跳蜘蛛) 和寄生虫 (虫) 进行实验性操纵.
- 观察的行为 (活动水平) 并评估感染的流行率和强度.
- 在不同威胁场景下比较感染和掠食率.
主要成果:
- 暴露于捕食者线索和寄生虫线索的的感染率明显更高 (80%的流行率,180%的强度).
- 寄生虫线索的存在没有影响蜘蛛的掠食率.
- 优先考虑避免掠食风险,接受增加的寄生虫感染.
结论:
- 多重威胁可能导致防御策略的权衡,并产生重大健康后果.
- 青虫 (Drosophila nigrospiracula) 优先考虑避开掠食者而不是对寄生虫的防御,从而增加感染风险.
- 研究结果强调了特征介导的间接影响在宿主-寄生虫和食物网相互作用中的作用,有助于恐惧的生态.
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