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首页> 外文期刊>Parasitology >The relative importance of host characteristics and co-infection in generating variation in Heligmosomoides polygyrus fecundity.
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The relative importance of host characteristics and co-infection in generating variation in Heligmosomoides polygyrus fecundity.

机译：宿主特征和共感染在多生螺旋藻繁殖力中产生变异的相对重要性。

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摘要

We examined the relative importance of intrinsic host factors and microparasite co-infection in generating variation in Heligmosomoides polygyrus fecundity, a parameter that serves as a proxy for infectiousness. We undertook extensive trapping of Apodemus flavicollis, the yellow-necked mouse in the woodlands of the Italian Alps and recorded eggs in utero from the dominant nematode species H. polygyrus, and tested for the presence of five microparasite infections. The results showed that sex and breeding status interact, such that males in breeding condition harboured more fecund nematodes than other hosts; in particular, worms from breeding males had, on average, 52% more eggs in utero than worms from non-breeding males. In contrast, we found a weak relationship between intensity and body mass, and no relationship between intensity and sex or intensity and breeding condition. We did not find any evidence to support the hypothesis that co-infection with microparasites contributed to variation in worm fecundity in this system. The age-intensity profiles for mice singly-infected with H. polygyrus and those co-infected with the nematode and at least one microparasite were both convex and not statistically different from each other. We concluded that intrinsic differences between hosts, specifically with regard to sex and breeding condition, contribute relatively more to the variation in worm fecundity than parasite co-infection status.
机译：我们检查了内源性宿主因子和微寄生虫共感染在产生Heligmosomoides polygyrus繁殖力（该参数可作为传染性指标）中产生变异的相对重要性。我们对意大利阿尔卑斯山林地的黄颈小鼠姬鼠Apodemus flavicollis进行了广泛诱捕，并在子宫内记录了来自主要线虫物种H. polygyrus的卵，并测试了五种微寄生虫感染的存在。结果表明，性别和繁殖状态相互影响，处于繁殖状态的雄性比其他寄主具有更多的繁殖力线虫。特别是，育种雄虫的子宫内卵平均比非育种雄虫的卵高52％。相反，我们发现强度与体重之间的关系较弱，强度与性别或强度与繁殖条件之间没有关系。我们没有找到任何证据支持这一假说，即与微寄生虫共感染会导致该系统中蠕虫繁殖力的变化。单感染多回嗜血杆菌以及与线虫和至少一种微寄生虫共感染的小鼠的年龄强度分布曲线均为凸形，且在统计学上无差异。我们得出的结论是，宿主之间的内在差异，特别是在性别和繁殖条件方面，比寄生虫共感染状态对蠕虫繁殖力的变化影响更大。

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