云南省锡金小鼠体表革螨感染分析

Analysis of Gamasid Mites(Acari:Mesostigmata)on Mus pahari in Yunnan Province

为了解云南省锡金小鼠(Mus pahari)体表革螨的感染情况及分布规律,本研究基于1990至2015年云南省39个县(市)的调查数据,统计分析锡金小鼠体表革螨的基本感染情况和感染差异。使用聚块指数测定革螨空间分布型,用Jaccard指数计算革螨物种相似性。从捕获的720只锡金小鼠体表共采集到革螨14098只,鉴定为2科12属37种。贵州厉螨(Laelaps guizhouensis)、贫毛厉螨(L.paucisetosa)和兴义厉螨(L.xingyiensis)是优势革螨,其在不同个体的锡金小鼠体表均呈聚集分布。不同地理景观中采集的锡金小鼠体表革螨的种类和数量相差大,山区景观中采集的锡金小鼠体表革螨的感染率Pm、平均多度MA和感染度MI均明显高于坝区景观中采集的个体(P<0.05)。不同性别的锡金小鼠体表革螨物种中度相似,雄鼠的平均多度和感染度高于雌鼠(P<0.05)。种-样方关系图显示革螨物种数随宿主抽样量的增加而增加。结果表明,锡金小鼠体表革螨感染普遍,三个优势螨种在不同个体的宿主体表呈聚集分布,采自不同地理景观的锡金小鼠体表革螨构成差异较大。

We investigate the infestation and distribution of gamasid mites on Mus pahari based on the field collections in 39 counties of Yunnan Province from 1990 to 2015 as well as the infestations of gamasid mites on M.pahar.We employed patchiness index to analyzed the spatial distribution pattern of gamasid mites and species similarity was analyzed by Jaccard Index.Totally,we collected 14098 individuals of gamasid mites from the 720 M.pahari mice and identified of 37 species belonging to 12 genera of 2 families.Of them 3 species(Laelaps guizhouensis,L.paucisetosa,L.xingyiensis)were dominant and showed aggregated distributions in each individual of M.pahari.The species and numbers of gamasid mites varied greatly in different landscapes,the infestations(prevalence Pm,mean abundance MA,mean intensity MI)of gamasid mites in mountainous landscape were higher than those in flatland landscape(P<0.05).The species of gamasid mites found on male and female mice were moderately similar,but males had higher mean abundance and intensity of mites than the female mice did(P<0.05).The species-plot showed that the gamasid mite species increased as host increase.In conclusion,the infestations of gamasid mites on the body surface of M.pahari were common,and the three dominant mite species were distributed aggregatedly,the composition of gamasid mites on the body surface of M.pahari was different in different landscapes.