Ecological analysis of gamasid mites on the body surface of Norway rats (Rattus norvegicus) in Yunnan Province, Southwest China

Liu, Zhe; Guo, Xian‐Guo; Fan, Rong; Zhao, Cheng-Fu; Mao, Ke-Yu; Zhang, Zhiwei; Zhao, Yi

doi:10.2478/s11756-019-00383-z

Cited by 16 publications

(42 citation statements)

References 39 publications

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“…The dispersion coefficient (C), patchiness index (m*/m), I-index (I) and Cassie index(C A ) were used to analyze the spatial distribution pattern of chigger mites among different individuals of R. norvegicus (Kuno, 1991;Saburova et al, 1995;Guo et al, 2006): where m, σ 2 and m* represent the mean, variance and mean crowding of chigger mites on the host. The aggregated distribution is determined when calculated indices are beyond their boundary values: C and m*/m>1, and I and C A >0 (Wang et al, 2019;Liu et al, 2020).…”

Section: Analysis Of Spatial Distribution Pattern Of Chigger Mitesmentioning

confidence: 99%

“…The Brown rat or Norway rat, Rattus norvegicus (Berkenhout, 1769), is a very common synanthropic rodent species (Rothenburger et al, 2015;Castillo & Paller, 2018), and it is one of dominant rodent species in Yunnan Province (Peng et al, 2017). Besides being a very harmful pest in agriculture (Feng & Himsworth, 2014;Rothenburger et al, 2015), R. norvegicus is also a very important reservoir host and infectious source of scrub typhus, HFRS and some other zoonoses (Walsh, 2014;Liu et al, 2017;Liu et al, 2020). Rattus norvegicus often harbors lots of ectoparasites including chigger mites (Schoof, 1948;Guo et al, 2016;Alonso et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Based on the abundant original data, the present paper analyzed the infestation and distribution of chigger mites on this species of rodent. Before the present study, our research group made some ecological analyses of gamasid mites, fleas and sucking lice on R. norvegicus (Zuo & Guo, 2011;Liu et al, 2020). Based on 431 Brown rats collected between 2003 and 2004 from a localized area in Yunnan Province of Southwest China, a previous study analyzed the species abundance distribution of ectoparasites on R. norvegicus, which involved four categories of ectoparasites -fleas, sucking lice, gamasid mites and chigger mites.…”

Section: Introductionmentioning

confidence: 99%

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Infestation and distribution of chigger mites on Brown rat (Rattus norvegicus) in Yunnan Province, Southwest China

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Chigger mites is a group of arthropods and some of them are vectors of scrub typhus. As a common synanthropic rodent species, the Brown rat (Rattus norvegicus) often harbors lots of ectoparasites including chigger mites. According to some "data mining" strategies, the present study took the advantage of the abundant original data from a long-term field ecological investigation between 2001 and 2015 to make a detailed analysis of chigger mites on R. norvegicus in Yunnan Province, Southwest of China. From 18 of 33 investigated counties, only 1414 chigger mites were collected from 1113 Brown rats with relatively low infestations. The 1414 individual chigger mites were identified as comprising 61 species, 11 genera and 2 subfamilies of the family Trombiculidae with a high species diversity (S=61, H'=3.13). Of 61 mite species, there were four main species, Walchia ewingi, Ascoschoengastia indica, W. koi and A. rattinorvegici, which accounted for 44.41% of the total mites. All the chigger mites were of aggregated distribution among different individuals of R. norvegicus. The Brown rats in the outdoor habitats harbored much more individuals and species of chigger mites with a higher mean abundance (MA=1.46) and mean intensity (MI=12.53) than in the indoor habitats (P<0.05). The overall infestation of the rats was significantly higher in the mountainous landscapes than in the flatland landscapes (P<0.001). The species similarity (C ss) of the mites on the male and female rats reached 64.44% with sex biased infestations. The male rats harbored more species and individuals of the mites than the female rats. The adult rats harbored more species and individuals of the mites than the juvenile rats. The species abundance distribution of the mites was successfully fitted by Preston's lognormal model with Ŝ(R)=15e-[0.31(R-1)] 2 (α=0.31, R 2 =0.95). On the basis of fitting the theoretical curve by Preston's model, the total mite species on R. norvegicus was estimated to be 86 species, and 25 rare mite species were missed in the sampling field investigation. The curve tendency of the species-plot relationship indicates that R. norvegicus have a great potential to harbor many species of chigger mites, and more species of the mites would be collected if more rats are sampled.

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Section: Analysis Of Spatial Distribution Pattern Of Chigger Mitesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Infestation and distribution of chigger mites on Brown rat (Rattus norvegicus) in Yunnan Province, Southwest China

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“…It is a very common rodent species in residential areas (especially the indoor habitats) in Central and Southern Yunnan [ 54 , 55 ]. Rattus norvegicus is widely distributed in the whole China, and it is also a very common rodent species in residential areas (especially the indoor habitats) in Yunnan, often co-occurring in the same areas with R. tanezumi [ 35 , 56 , 57 , 58 ]. The previous studies revealed that the main hosts of O. bacoti included some synanthropic rats and mice with humans (especially R. norvegicus ) and experimental rats and mice [ 3 , 7 , 18 ].…”

Section: Discussionmentioning

confidence: 99%

“…The indoor habitats covered houses, barns, stables, etc., and the outdoor habitats covered paddy fields, cornfields, bush habitats, woodlands, etc. [ 35 ]. Each trapped host was euthanized through anesthesia with ether (cotton balls soaked with ether), within a closed container.…”

Section: Methodsmentioning

confidence: 99%

Distribution and Host Selection of Tropical Rat Mite, Ornithonyssus bacoti, in Yunnan Province of Southwest China

Yin

Guo

Jin

et al. 2021

Animals

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(1) Background: As a species of gamasid mite, the tropical rat mite (Ornithonyssus bacoti) is a common ectoparasite on rodents and some other small mammals. Besides stinging humans to cause dermatitis, O. bacoti can be a vector of rickettsia pox and a potential vector of hemorrhagic fever with renal syndrome (HFRS). (2) Objective: The present study was conducted to understand the host selection of O. bacoti on different animal hosts and the distribution in different environmental gradients in Yunnan Province of Southwest China. (3) Methods: The original data came from the investigations in 39 counties of Yunnan, between 1990 and 2015. The animal hosts, rodents and some other small mammals were mainly trapped with mouse traps. The O. bacoti mites on the body surface of animal hosts were collected and identified in a conventional way. The constituent ratio (Cr), prevalence (PM), mean abundance (MA) and mean intensity (MI) were used to reflect infestations of animal hosts with O. bacoti mites. The patchiness index and Taylor’s power law were used to measure the spatial distribution pattern of O. bacoti mites on their hosts. (4) Results: A total of 4121 tropical rat mites (O. bacoti) were identified from 15 species and 14,739 individuals of hosts, and 99.20% of them were found on rodents. More than half of O. bacoti mites (51.78%) were identified from the Asian house rat (Rattus tanezumi), and 40.09% of the mites from the Norway rat (R. norvegicus) (p < 0.05). The infestations of R. tanezumi (PM = 7.61%, MA = 0.40 and MI = 5.31) and R. norvegicus (PM = 10.98, MA = 1.14 and MI = 10.39) with O. bacoti mites were significantly higher than those of other host species (p < 0.05). The infestations of two dominant rat hosts (R. tanezumi and R. norvegicus) with O. bacoti mites varied in different environmental gradients (latitudes, longitudes, altitudes, landscapes and habitats) and on different sexes and ages of the hosts. The prevalence of juvenile R. norvegicus rats with O. bacoti mites (PM = 12.90%) was significantly higher than that of adult rats (PM = 9.62%) (p < 0.05). The prevalence (PM = 38.46%) and mean abundance (MA = 2.28 mites/host) of R. tanezumi rats with O. bacoti mites in the high latitude were higher than those in the low latitudes (p < 0.05). The majority of the total collected 4121 O. bacoti mites was found in the flatland landscape (91.28%) and indoor habitat (73.48%) (p < 0.05). The PM (10.66%) and MA (0.49 mites/host) of R. tanezumi rats with O. bacoti mites were significantly higher in the indoor habitat than in the outdoor habitat (p < 0.05). The tropical rat mites showed an aggregated distribution pattern on their first dominant host, R. tanezumi. Conclusion: The tropical rat mite (O. bacoti) is a widely distributed species of gamasid mite in Yunnan Province, Southwest China, and its dominant hosts are two synanthropic species of rats, R. tanezumi and R. norvegicus. It is mainly distributed in the flatland landscape and indoor habitat. It has some host-specificity, with a preference to rodents, especially R. tanezumi and R. norvegicus. The O. bacoti mites are of aggregated distribution on R. tanezumi rats.

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Infestation and distribution of mites on the Yunnan red-backed vole (Eothenomys miletus) in Yunnan Province of southwest China between 2001 and 2015

et al. 2021

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Ecological analysis of gamasid mites on the body surface of Norway rats (Rattus norvegicus) in Yunnan Province, Southwest China

Cited by 16 publications

References 39 publications

Infestation and distribution of chigger mites on Brown rat (Rattus norvegicus) in Yunnan Province, Southwest China

Infestation and distribution of chigger mites on Brown rat (Rattus norvegicus) in Yunnan Province, Southwest China

Distribution and Host Selection of Tropical Rat Mite, Ornithonyssus bacoti, in Yunnan Province of Southwest China

Infestation and distribution of mites on the Yunnan red-backed vole (Eothenomys miletus) in Yunnan Province of southwest China between 2001 and 2015

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