Gruner L, Mauleon H, Sauve C
Ann Rech Vet. 1982;13(1):51-9.
Experiments were done in natural and laboratory conditions with ovine Trichostrongyle species by depositing infective larvae on the top or inside a tube filled with soil. After different periods, extractions were done from soil samples taken after every 5 cm. Patterns of larval positions in the soil layers were similar for the 4 species in the experiments, though numbers of recovered larvae were not similar. In outdoor conditions at the end of winter, larvae could migrate from the surface to 40 cm depth or more in two weeks even if soil temperature was as low as 6 degrees C. These downward migrations seemed mainly due to water percolation through soil. Active migrations through soil were favoured according to the amount of soil water content but larvae had the ability to actively migrate upwards even in relatively dry conditions.
通过将感染性幼虫放置在装满土壤的管子顶部或内部，在自然和实验室条件下对绵羊毛圆线虫进行了实验。经过不同时间段后，从每隔5厘米采集的土壤样本中进行提取。实验中4种线虫在土壤层中的幼虫分布模式相似，尽管回收的幼虫数量不同。在冬季末的户外条件下，即使土壤温度低至6摄氏度，幼虫也能在两周内从地表迁移到40厘米或更深的深度。这些向下迁移似乎主要是由于水分通过土壤渗透所致。根据土壤含水量，幼虫更倾向于在土壤中进行主动迁移，但即使在相对干燥的条件下，幼虫也有向上主动迁移的能力。
