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Objective: In Yunnan 19 counties (cities) of the basic structure of chigger communities, based on the depth and diversity of Yunnan chiggers regularity in the host selection, focusing on a small plate and ground Leptotrombidium Leptotrombidium Both media chiggers in Yunnan Province, different regions, different host distribution. Methods: (1) According to Yunnan different geographical position, topography, climate and ecology and many other features, in 2001-2009, selected 19 counties (city) for the field survey points, with cage (folder) plus trapping small prey beast. Scraped with a scalpel blade ear, ear canal (fixed collection site) all the chiggers, placed in advance of the EP with 70% ethanol, a small tube temporarily stored, and then Hoyer's solution were mounted, identified under the microscope after mite species; ( 2) Chiggers community structure with richness (S), Shannon-Wiener diversity index (F), evenness (E) and the advantage index (J) This four parameters observed indicators, describing the surface of different small mammals Chiggers community structure; (3) selection of Levins niche breadth index (Bi) and niche overlap index (Cih) to describe each chiggers niche. Then SPSS16.0 software for cluster analysis, according to the clustering results into different mite species niche overlap between the groups. Results: (1) 2001-2009 19 counties in Yunnan province (city) 10 222 small mammals were captured, belonging to 5 orders, 11 families and 34 genera and 62 kinds. Small mammals in the 10222 bilateral ear, ear canal were collected from 92,990 chiggers, identified as three subfamilies 22 genera and 224 kinds. Yunnan chiggers complex community structure, species diversity is high, both higher than other domestic provinces (area) of chiggers number of species, also higher than the surface on small mammals in Yunnan parasitic sucking lice, fleas and mites leather number of species. 224 kinds of chiggers, there are 21 kinds of chiggers (a total of 76,389) of the constituent ratio of greater than 1% of the total chiggers (92990) of 82.15%, is defined as the main chigger species in Yunnan Province. One small plate Leptotrombidium and China's Yunnan Province Leptotrombidium dominant chigger species. (2) small animal body surface generally parasitic mite, mite infection rate was 28.17% of total, total mite index was 9.10 / mouse. Most of the body surface can be a variety of small mammals chigger mite species while most parasites can also be parasitic on a variety of small mammals surface. 62 kinds of small mammals, 18 species of small animals constituent ratio of greater than 1%, mainly small mammal species in Yunnan Province. Of which there are 17 species of small animal body surface is more than 10 species parasitic chigger 4 conceal. Miletus most parasitized of 111 kinds of chiggers. (3) community similarity studies show: Different small mammals surface parasitic mite community similarity not only with the small mammal hosts in animal taxonomy and relatives of the taxonomic status of the relationship, but also with small mammal hosts habitat and habitat activities , chiggers their physiological characteristics, the local environment of temperature, humidity and light and other factors. (4) Niche research shows: 21 kinds of major mite species, the micro board without prior chiggers widest niche breadth, host specificity minimum; deputy shall narrowest niche Leptotrombidium, host specificity. (5) niche overlap cluster analysis showed that 21 kinds of major chiggers divided into five groups of niche overlap, which Leptotrombidium Eothenomys, Yunnan leaves chiggers, West Union co-wheel chigger mites, chiggers Qiangbang reptiles , tongue back exhibition chiggers, small plates Leptotrombidium clustered into one group, mainly parasitic overlap miletus, Qi's Apodemus surface. China Leptotrombidium, Yongsheng Leptotrombidium in s Leptotrombidium, tree shrews Leptotrombidium, deputy shall Leptotrombidium, India sac sticks chiggers clustered together, their common host is Rattus norvegicus, Steinmann home mouse, etc.: Leptotrombidium winter, countryside Leptotrombidium, dense point Leptotrombidium, ground Leptotrombidium, Shimonoseki Leptotrombidium as a class, they are mainly parasitic overlap and short-tailed shrew smelly Diao murinus; Yau's No pre chigger mites, chiggers microplate without front of a class, jointly hosted mainly China and Karnofsky Apodemus mice, etc.; Leptotrombidium Wang, Xu co-wheel chiggers as a class, the main overlap in large parasitic velvet rats and mice and other Dazu. Visible different subfamilies, different genera, different species of chiggers can have a common small mammal hosts, the presence of cross and overlap parasitic parasitic phenomenon. (6) small plates Leptotrombidium widely distributed in Yunnan Province, quantity, mainly concentrated in the high altitude (2000m above), low rainfall area (average annual rainfall is less than 1100mm), the main host for the miletus, Qi's Ji Mouse; ground Leptotrombidium mainly distributed in Yunnan Province in low altitude (1300m less), abundant rainfall areas, the main host for the flavipectus. Conclusions: (1) the complexity of Yunnan chiggers community structure, species diversity richness. Small plates Leptotrombidium and China Yunnan Province Leptotrombidium dominant chigger species. In addition to the ground outside Leptotrombidium, Yunnan many infectious diseases may coexist media chiggers. (2) surface generally small mammals chigger, the same host can have a variety of parasitic mite, chigger same kind of parasites on multiple hosts simultaneously surface. (3) Most chigger species niche breadth broad host specificity is low. Different mite species in the small animal body surface cross-parasitic and parasitic overlap. (4) small plates Leptotrombidium mainly in southern Yunnan, northwest Yunnan high altitude, low rainfall areas; main reservoirs are miletus and Qi's Apodemus. Ground Leptotrombidium mainly in Yunnan, southern Yunnan, low altitude, abundant rainfall volume region, mainly the host is flavipectus.
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