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首页> 外文期刊>Parasitology >Epidemiology of parasitic protozoan infections in Soay sheep (Ovis aries L.) on St Kilda.
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Epidemiology of parasitic protozoan infections in Soay sheep (Ovis aries L.) on St Kilda.

机译：圣基尔达州Sooy羊（Ovis aries L.）的寄生虫原生动物感染的流行病学。

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摘要

The feral Soay sheep (Ovis aries L.) population on Hirta, St Kilda, is host to a diverse component parasite community, but previous parasitological studies of the population have only focussed on the metazoan species. This paper reports the first epidemiological study of the protozoan species comprising Cryptosporidium parvum, Giardia duodenalis and 11 species of Eimeria in Soay sheep across 3 years of varying host population density. Prevalence and intensity of almost all species of protozoa significantly decreased with host age, with the exception of E. granulosa, which increased in prevalence with host age. The prevalence of C. parvum appeared to vary positively with host population density but that of G. duodenalis did not vary significantly with density. Most species of Eimeria showed a distinct lag in infection level following the host population crash of 2002, taking up to 2 years to decrease. Mixed Eimeria species intensity and diversity were highest in 2002, a year of low host density. Parasite diversity decreased with host age and was higher in males. There were 5 positive pair-wise associations between protozoa species in terms of prevalence. The results of this study highlight the potential for protozoal infection to shape the evolution of parasite resistance in wild host populations harbouring diverse parasite species.
机译：圣基尔达（Hilta）州圣基尔达（Hirta）的野生Soay绵羊（Ovis aries L.）种群拥有多种多样的寄生虫群落，但先前对该种群的寄生虫学研究仅集中于后生动物物种。本文报道了在3年间不同宿主种群密度下对Soay羊的原生动物物种的首次流行病学研究，该物种包括小隐孢子虫，贾第鞭毛虫和11种艾美球虫。随宿主年龄的增长，几乎所有原生动物物种的患病率和强度均显着下降，但粒状大肠杆菌除外，随宿主年龄的患病率增加。细小衣原体的患病率似乎随寄主种群密度呈正相关，而十二指肠菌的流行率随密度没有显着变化。在2002年寄主种群崩溃之后，大多数艾美叶菊属物种在感染水平上表现出明显的滞后性，最多需要2年的时间才能减少。在2002年，即寄主密度较低的一年，混合艾美球虫的物种强度和多样性最高。寄生虫多样性随着寄主年龄的增长而降低，而男性则更高。就患病率而言，原生动物之间存在5个成对的正向关联。这项研究的结果突显了原生动物感染潜在影响携带多种寄生虫物种的野生寄主种群中寄生虫抗性的演变。

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