Grønvold J, Sommer C, Holter P, Nansen P
Department of Veterinary Microbiology, Royal Veterinary and Agricultural University, Frederiksberg, Denmark.
J Parasitol. 1992 Oct;78(5):845-8.
From a thoroughly mixed portion of cattle feces with Cooperia sp. eggs, 1-kg artificial pats were placed in 6 buckets containing 6 kg of soil each. Ten dung beetles, Diastellopalpus quinquedens, were added to each of 3 buckets. The remaining 3 buckets served as controls without beetles. When infective parasite larvae (L3) had developed in the cow pats indoors, the following procedure was followed. During occasions of rainfall each bucket was placed outdoors in the center of a wider and higher container. When the rain stopped all buckets were brought indoors, and infective larvae spread by splash droplets during the rain were collected in the containers and counted. After 33 days, the remaining dung on the soil surface in buckets with dung beetles constituted only 38% of that in the controls. Moreover, the number of L3 in feces left on the soil surface in the buckets with beetles was reduced by 88%, presumably due to beetle activity. This may explain the 70-90% reduction in splash dispersal of L3 of Cooperia sp. from cow pats attacked by beetles. The dung-burying activity of the beetles did not result in increased numbers of L3 in the soil under the cow pats, suggesting that many of the parasites in buried feces were destroyed.
从一份与库珀属虫卵充分混合的牛粪中，取出1千克制成人工粪堆，放入6个桶中，每个桶装有6千克土壤。在3个桶中各放入10只双点粪金龟。其余3个桶作为无甲虫的对照。当室内牛粪中发育出感染性寄生虫幼虫（L3）后，按以下步骤进行。下雨时，每个桶被放置在户外一个更宽更高的容器中央。雨停后，所有桶被带回室内，收集雨中飞溅水滴传播的感染性幼虫并计数。33天后，有粪金龟的桶中土壤表面剩余的粪便仅占对照中粪便的38%。此外，有甲虫的桶中留在土壤表面粪便中的L3数量减少了88%，推测是由于甲虫的活动。这可能解释了受甲虫攻击的牛粪中库珀属L3的飞溅传播减少了70%至90%。甲虫的埋粪活动并未导致牛粪下土壤中L3数量增加，这表明埋入粪便中的许多寄生虫被消灭了。
