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首页> 外文期刊>Parasitology >Local environmental factors characterizing Ixodes ricinus nymph abundance in grazed permanent pastures for cattle.
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Local environmental factors characterizing Ixodes ricinus nymph abundance in grazed permanent pastures for cattle.

机译：当地的环境因素是牛永久放牧牧场中蓖麻I若虫数量丰富的特征。

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摘要

Although Ixodes ricinus ticks are mainly associated with woodland, they are also present in open habitat such as pastures. The distribution of nymphal I. ricinus was monitored by drag sampling the vegetation in May-June 2003 on 61 grazed permanent pastures for cattle located in central France. After selecting explanatory variables from among a set of 155, tick abundance was modelled on the perimeter of the pasture using a negative binomial model that took into account data overdispersion. An abundant tree layer at the perimeter of the pasture associated with a high humidity before sampling greatly enhanced the average number of captured I. ricinus nymphs. The presence of apple or cherry trees around the pasture perimeter, the presence of trees or bushes at the pasture edge, woodland around the pasture and a high number of I. ricinus nymphs in the nearest woodland to the pasture were also favourable to nymph abundance in the pasture. The study highlighted that woodland vegetation associated with humidity and the presence of attractive foraging areas for tick hosts around the pasture played a key role in the abundance of I. ricinus. Finally, the results raised the question of whether and how transfer of ticks between woodland and grazed pastures occurs.
机译：尽管蓖麻I（Ixodes ricinus tick）主要与林地有关，但它们也存在于牧场等露天栖息地中。通过对2003年5月至6月位于法国中部的61个放牧永久性牧场的牛进行植被采样，监测了若虫I. ricinus的分布。从155个集合中选择解释性变量后，使用负二项式模型在牧场的周长上模拟tick的丰度，该模型考虑了数据的过度分散。采样之前，牧场周边的树木层丰富，湿度高，极大地提高了被捕获的蓖麻蓖麻若虫的平均数量。牧场周围有苹果树或樱桃树，牧场边缘有乔木或灌木丛，牧场周围有林地，离牧场最近的林地中有大量蓖麻若虫，也有利于该地区若虫的丰度。牧场。该研究强调，与湿度相关的林地植被以及牧场周围tick虫寄主的诱人觅食区的存在对蓖麻毒素的丰富性起着关键作用。最后，结果提出了一个问题，即林地和草场之间tick的转移是否发生以及如何发生。

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