云南省16个县(市)黄胸鼠体表恙螨种类调查

目的了解云南省黄胸鼠（Rattus flavipectus）体表恙螨的寄生、种类组成、优势种及其空间分布型.方法选取云南省16个县（市）作为调查点,在现场用鼠笼加食饵诱捕黄胸鼠,收集耳壳及耳窝全部恙螨,用Hoyer＇s液封片后在显微镜下分类、鉴定.恙螨种群的空间分布格局用分布型指数中的聚块指数（m＊/m）测定.结果在所调查的16个县（市）中,从13个县（市）捕获黄胸鼠725只,共采集恙螨2 710只,经鉴定隶属3亚科10属42种.印度囊棒恙螨（Ascoschoengastia indica）、微板无前恙螨（Walchia micropelta）、李氏囊棒恙螨（A.leechi）、蒙大微恙螨（Microtrombicula munda）为优势螨种,其带螨率和螨指数较高,依次分别为6.8%、5.5%、3.9%、4.3%和1.65、0.64、0 43、0 42.结论黄胸鼠体表恙螨种类复杂,数量丰富,呈聚集型分布.

Species Investigation of Chigger Mites on the Rat, Rattus flavipectus in 16 Counties (or Towns) of Yunnan, China

Objective To understand the species composition,species distribution,the dominant species and their spatial pattern of ectoparasitic chigger mites on Rattus flavipectus(a dominant species of rats in Yunnan,China).Methods(R.flavipectus)(the host of mite) was captured with cage trap method in 16 counties(or towns) of Yunnan.All the mites on the two auricles surface of the hosts were completely collected,made into specimens and then identified under a microscope.The patch index((m~*/m)) was adopted to judge the spatial distribution patterns of the dominant chigger mite species among the different individuals on their rat hosts((R.flavipectus)). Results 725 individuals of R.flavipectus were captured only in 13 ones of those 16 counties(towns).(2 710) chigger mites(belonging to 3 subfamily,10 genus,42 species) were collected from the auricles(body surface) of 725 rat hosts(R.flavipectus) with high mite infection rate and mite index.There are four dominant mite species: Ascoschoengastia indica,(A.leechi),Walchia micropelta and Microtrombicula munda.Conclusion(The chigger) mites species on R.flavipectus is very abundant with more individuals.The distribution of the chigger mites among different individuals of(R.flavipectus) is of an aggregation pattern.