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The influence of water on the migration of infective trichostrongyloid larvae onto grass

机译：水对感染性毛圆线虫幼虫在草上迁移的影响

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摘要

Detailed knowledge of the effects of water on the migration of infective larvae of economically important trichostrongyloid species is urgently needed to feed into prediction models of future epidemiology. The influence of water on the migration of the parasitic nematodes Nematodirus battus, Haemonchus contortus and Teladorsagia circumcincta from sheep dung onto grass was examined in a series of laboratory experiments. Turf plots were seeded with larvae, which were recovered from grass clippings by serial sampling. Free water was necessary for larvae to escape from dung, but not for vertical migration onto grass. When temperature and relative humidity were held constant, the proportion of a population of live larvae present on herbage reached a plateau of around 2 (1-10)% after 24 h, and then changed little over time. Larvae in soil and dung formed a reservoir, such that a similar proportion of the larval population was maintained on grass after clipping. These findings suggest continuing random movement of free larvae. Implications for the epidemiology of trichostrongyloid species are discussed in the context of trade-offs faced by the parasites.
机译：迫切需要详细了解水对经济上重要的单螺旋线虫物种的感染性幼虫迁移的影响，才能将其用于未来的流行病学预测模型。在一系列的实验室实验中，研究了水对寄生线虫蝙蝠线虫，捻转血矛线虫和圆线虫从羊粪中迁移到草上的影响。草坪上种有幼虫，通过连续取样从草屑中回收。幼虫从粪便中逸出需要游离水，但对于垂直迁移到草上则不需要。当温度和相对湿度保持恒定时，牧草上存在的活幼虫种群的比例在24小时后达到约2（1-10）％的平稳期，然后随时间变化很小。土壤和粪便中的幼虫形成了一个水库，因此修剪后在草地上可以维持相似比例的幼虫种群。这些发现表明游离幼虫的持续随机运动。在寄生虫所面临的权衡取舍的背景下，讨论了单线体类线虫物种的流行病学意义。

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