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Rainfall as a driver of seasonality in parasitism.
International Journal for Parasitology: Parasites and Wildlife ( IF 2.0 ) Pub Date : 2020-04-17 , DOI: 10.1016/j.ijppaw.2020.04.004 Caroline L Shearer 1 , Vanessa O Ezenwa 1, 2
International Journal for Parasitology: Parasites and Wildlife ( IF 2.0 ) Pub Date : 2020-04-17 , DOI: 10.1016/j.ijppaw.2020.04.004 Caroline L Shearer 1 , Vanessa O Ezenwa 1, 2
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Parasite burdens are known to vary seasonally in wildlife, and rainfall is one key aspect of seasonality that has been linked to parasitism in a range of systems. Rainfall can have immediate effects on parasitism rates by affecting parasite survival and movement in the environment, or it can have delayed effects by affecting host susceptibility to parasites through changes in host body condition or immune function. In this study, we examined how helminth infection in a wild ungulate (Grant's gazelle, Nanger granti) is impacted by seasonal changes in rainfall. We looked at how the burdens of three helminth parasites varied in relation to current (immediate effect) and prior (delayed effect) rainfall by comparing parasite fecal egg and larval counts to rainfall 0, 1, and 2 months prior to parasite sampling. We found burdens of all three parasites to be negatively associated with rainfall, and that delayed effects were stronger than immediate effects. Our findings implicate rainfall as a driver of seasonal variation in infection and suggest one important mechanism may be through delayed effects on host susceptibility.
中文翻译：
降雨是寄生虫的季节性驱动因素。
众所周知，野生生物中的寄生虫负担会随季节变化，降雨是季节性的一个重要方面，与一系列系统中的寄生虫有关。降雨可能通过影响环境中的寄生虫生存和运动而对寄生虫发生率产生直接影响，也可能通过改变宿主的身体状况或免疫功能而影响宿主对寄生虫的敏感性而产生延迟效应。在这项研究中，我们研究了野生有蹄类动物（Grant的瞪羚，Nanger Granti）中的蠕虫感染如何受到降雨季节变化的影响。通过比较寄生虫采样前0、1、2个月的寄生虫粪便卵和幼虫计数与降雨，我们观察了三种蠕虫寄生虫的负担相对于当前（立即作用）和先前（延迟作用）降雨的变化。我们发现这三种寄生虫的负担与降雨负相关，延迟效应要强于即时效应。我们的发现暗示降雨是感染季节性变化的驱动因素，并暗示一个重要的机制可能是对宿主敏感性的延迟影响。
更新日期：2020-04-17
中文翻译：
降雨是寄生虫的季节性驱动因素。
众所周知，野生生物中的寄生虫负担会随季节变化，降雨是季节性的一个重要方面，与一系列系统中的寄生虫有关。降雨可能通过影响环境中的寄生虫生存和运动而对寄生虫发生率产生直接影响，也可能通过改变宿主的身体状况或免疫功能而影响宿主对寄生虫的敏感性而产生延迟效应。在这项研究中，我们研究了野生有蹄类动物（Grant的瞪羚，Nanger Granti）中的蠕虫感染如何受到降雨季节变化的影响。通过比较寄生虫采样前0、1、2个月的寄生虫粪便卵和幼虫计数与降雨，我们观察了三种蠕虫寄生虫的负担相对于当前（立即作用）和先前（延迟作用）降雨的变化。我们发现这三种寄生虫的负担与降雨负相关，延迟效应要强于即时效应。我们的发现暗示降雨是感染季节性变化的驱动因素，并暗示一个重要的机制可能是对宿主敏感性的延迟影响。
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