云南省小型哺乳动物寄生恙螨群落种多度分布

目的了解云南省小型哺乳动物寄生恙螨种类和数量分布情况。方法选取云南省16个县（市）为调查点，现场用鼠笼加食饵诱捕小型哺乳动物（小兽），收集其耳廓和外耳道全部恙螨，用Hoyer’s液封片，制成玻片标本后，常规分类、鉴定。种多度分布采用Preston对数正态分布拟合。结果共捕获小兽6888只，其双耳部检获恙螨87416只，属3亚科21属192种。小板纤恙螨（Leptotrombidium scutellare）和中华纤恙螨（Leptotrombidium sinicum）为主要优势螨种。种多度分布趋势用Preston对数正态分布模型拟合较好，拟合优度为0．7975。结论云南省小型哺乳动物寄生恙螨群落的种多度关系呈对数正态分布，中等个体数量的恙螨种类占多数，个体数量很少的稀有种次之，个体数量很大的优势种类在群落内只是少数。

The species abundance distribution of chigger communities associated with small mammals in Yunnan, China

Objective To understand the species distribution of ectoparasitic chigger communities on small mammals in Yunnan province. Methods Mammals （the host of chiggers） were captured with mouse cage traps and bait in 16 counties （or cities） of Yunnan province. All the chiggers on two auricles of the hosts were made into specimens with Hoyer＇ s medium and all the specimens were identified under microscope. Preston＇s lognormal distribution model was used to fit the species abundance. Results 6888 small mammal hosts were captured and 192 chigger species were collected, which belong to 21 genera, 3 subfamily of Trombiculidae. Leptotrombidium scutellare and L. sinicum were dominant chigger species. The species abundance distribution of chigger mites is successfully fitted to Preston＇s lognormal distribution model with the goodness of fit of 0. 7975. Conclusion The species abundance distribution of chiggers on small mammals conforms to the lognormal distribution. Most chiggers species are the common species with middle levels of individuals, rare species take second place, while few species are dominant quantitatively.