20 results on '"Wen Yu"'
Search Results
2. Infestation and distribution of chiggers on the Anderson's white‐bellied rats in southwest China.
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Guo, Yu, Guo, Xian‐Guo, Peng, Pei‐Ying, Lv, Yan, Xiang, Rong, Song, Wen‐Yu, and Huang, Xiao‐Bin
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TSUTSUGAMUSHI disease ,MITES ,RATS ,MURIDAE ,FIELD research ,RODENTS - Abstract
As a group of ectoparasites, chiggers (larvae of chigger mites) are the exclusive vector of scrub typhus (tsutsugamushi disease). Rodents are the most important hosts of chiggers. The Anderson's niviventer rat, Niviventer andersoni, is an endemic species of rodent in China. However, few studies have involved this endemic rodent species and its ectoparasites including chiggers. According to the field investigation in five provincial regions of southwest China between 2001 and 2019, this paper retrospectively analysed the infestation and distribution of chiggers on the body surface of N. andersoni in southwest China for the first time. From 77 Anderson's niviventer rats captured, a total of 527 chiggers were collected and they were identified as 39 species and nine genera in two subfamilies of family Trombiculidae. Of 39 chigger species identified, Leptotrombidium deliense and L. scutellare are the most important vectors of scrub typhus in China. The overall infestation indexes were PM = 29.87%, MA = 6.84 and MI = 22.91, and the indexes of chigger mite community were Mf = 39, H' = 2.60, E = 0.71 and D = 0.12. The dominant chigger species are L. wenense, L. xiaguanense and L. fujianense with a total Cr = 51.04%, among which L. wenense is one of the six main vectors of scrub typhus in China. The dominant chigger species are of aggregated distribution among different individuals of the rats. [ABSTRACT FROM AUTHOR]
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- 2023
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3. Comparison of Chiggers (Acari: Trombiculidae, Leeuwenhoekiidae) on Two Sibling Mouse Species, Apodemus draco and A. ilex (Rodentia: Muridae), in Southwest China
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Yu Guo, Xian-Guo Guo, Wen-Yu Song, Yan Lv, Peng-Wu Yin, and Dao-Chao Jin
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General Veterinary ,chigger mites ,ectoparasite ,South China field mouse ,Lantsang field mouse ,rodent ,southwest China ,Animal Science and Zoology - Abstract
Chigger mites (Acari) are common ectoparasites on rodents, and they are the exclusive vector of scrub typhus. South China field mouse (Apodemus draco) and Lantsang field mouse (A. ilex) are two sibling rodent species. Based on field investigations in southwest China (2001–2015), this paper compared the infestation of these two mouse species with chiggers. Of 42 chigger species identified from two mouse species, 36 were found on A. draco, 11 on A. ilex and 5 common species on both mice. Jaccard similarity index (J = 0.12, J < 0.25) showed a very different species composition of chiggers on two mouse species, and some parameters of the chigger community were also different. The overall mean intensity of chiggers on A. draco (MI = 4.26) was higher than that on A. ilex (MI = 3.91, p < 0.05). The dominant chigger species on A. draco were Trombiculindus yunnanus, Leptotrombidium scutellare (a major vector species in China) and L. sinicum with a total constituent ratio Cr = 42.9% (106/247). Leptorombidium sinicum and L. scutellare independently occurred on A. draco with an association coefficient V = 0.09 (V ≈ 0). The dominant chigger species on A. ilex were L. rusticum, L. densipunctatum and L. gongshanense, with a total Cr = 58.14% (25/43). Leptorombidium rusticum and L. densipunctatum on A. ilex had a slight positive association (V = 0.49, 0.5 < V < 1). All dominant chigger species were unevenly distributed among different individuals of two mouse species. Chigger infestation showed sex bias on different sexes of two mouse species. The species abundance of the chigger community on A. draco was revealed as a log-normal distribution pattern.
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- 2023
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4. Disease vector occurrence and ecological characteristics of chiggers on the chestnut white-bellied rat Niviventer fulvescens in Southwest China between 2001 and 2019.
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Yan-Ling Chen, Xian-Guo Guo, Wen-Yu Song, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Wen-Ge Dong, Xiao-Bin Huang, and Dao-Chao Jin
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TSUTSUGAMUSHI disease ,CHESTNUT ,MICROSCOPES ,LEPTOTROMBIDIUM - Abstract
Chigger mites are the vector of scrub typhus. This study estimates the infestation status and ecological characteristics of chiggers on the chestnut white-bellied rat Niviventer fulvescens in Southwest China between 2001 and 2019. Chiggers were identified under the microscope, and infestation indices were calculated. The Preston’s log-normal model was used to fit the curve of species abundance distribution. A total of 6,557 chiggers were collected in 136 of 342 N. fulvescens rats, showing high overall infestation indices (prevalence=39.8%, mean abundance=19.2, mean intensity=48.2) and high species diversity (S=100, H’=3.0). Leptotrombidium cangjiangense, Neotrombicula japonica, and Ascoschoengastia sifanga were the three dominant chigger species (constituent ratio=42.9%; 2,736/6,384) and exhibited an aggregated distribution among different rat individuals. We identified 100 chigger species, with 3 of them (Leptotrombidium scutellare, Leptotrombidium wenense, and Leptotrombidium deliense) as the main vectors of scrub typhus in China and nine species as potential vectors of this disease. Disease vector occurrence on N. fulvescens may increase the risk of spreading scrub typhus from rats to humans. Chigger infestation on N. fulvescens varied significantly in different environments. The species abundance distribution showed a log-normal distribution pattern. The estimated number of chigger species on N. fulvescens was 126 species. [ABSTRACT FROM AUTHOR]
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- 2023
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5. Comparison of Chiggers (Acari: Trombiculidae, Leeuwenhoekiidae) on Two Sibling Mouse Species, Apodemus draco and A. ilex (Rodentia: Muridae), in Southwest China.
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Guo, Yu, Guo, Xian-Guo, Song, Wen-Yu, Lv, Yan, Yin, Peng-Wu, and Jin, Dao-Chao
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MURIDAE ,APODEMUS ,RODENTS ,TSUTSUGAMUSHI disease ,MITES ,MICE - Abstract
Simple Summary: Chigger mites (Acari) are common ectoparasites and the exclusive vector of scrub typhus. South China field mouse (Apodemus draco) and Lantsang field mouse (A. ilex) are two sibling rodent species. The investigation in southwest China (2001–2015) showed that chigger infestations on two mouse species were quite different, including different species composition, overall infestation, community parameters and dominant chigger species. There were 36 chigger species found on A. draco and 11 on A. ilex, and the overall mean intensity of chiggers on A. draco (MI = 4.26) was higher than that on A. ilex (MI = 3.91, p < 0.05). Dominant chiggers were unevenly distributed among different individuals of mouse hosts, and chigger infestation showed sex bias on different mouse sexes. The species abundance of the chigger community on A. draco was revealed as a log-normal distribution pattern. Chigger mites (Acari) are common ectoparasites on rodents, and they are the exclusive vector of scrub typhus. South China field mouse (Apodemus draco) and Lantsang field mouse (A. ilex) are two sibling rodent species. Based on field investigations in southwest China (2001–2015), this paper compared the infestation of these two mouse species with chiggers. Of 42 chigger species identified from two mouse species, 36 were found on A. draco, 11 on A. ilex and 5 common species on both mice. Jaccard similarity index (J = 0.12, J < 0.25) showed a very different species composition of chiggers on two mouse species, and some parameters of the chigger community were also different. The overall mean intensity of chiggers on A. draco (MI = 4.26) was higher than that on A. ilex (MI = 3.91, p < 0.05). The dominant chigger species on A. draco were Trombiculindus yunnanus, Leptotrombidium scutellare (a major vector species in China) and L. sinicum with a total constituent ratio C
r = 42.9% (106/247). Leptorombidium sinicum and L. scutellare independently occurred on A. draco with an association coefficient V = 0.09 (V ≈ 0). The dominant chigger species on A. ilex were L. rusticum, L. densipunctatum and L. gongshanense, with a total Cr = 58.14% (25/43). Leptorombidium rusticum and L. densipunctatum on A. ilex had a slight positive association (V = 0.49, 0.5 < V < 1). All dominant chigger species were unevenly distributed among different individuals of two mouse species. Chigger infestation showed sex bias on different sexes of two mouse species. The species abundance of the chigger community on A. draco was revealed as a log-normal distribution pattern. [ABSTRACT FROM AUTHOR]- Published
- 2023
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- View/download PDF
6. Infestation and distribution of chigger mites on Brown rat (Rattus norvegicus) in Yunnan Province, Southwest China
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Xian-Guo Guo, Cheng-Fu Zhao, Rong Fan, Ti-Jun Qian, F Ding, Hao Lin, Pei-Ying Peng, Zhi-Wei Zhang, Ke-Yu Mao, Wen-Yu Song, Wen-Ge Dong, Zhi-Hua Yang, and Yun-Ji Zou
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Male ,China ,Mite Infestations ,integumentary system ,Rodent ,biology ,Brown rat ,Species diversity ,Zoology ,Trombiculidae ,biology.organism_classification ,medicine.disease_cause ,Rats ,respiratory tract diseases ,Habitat ,Abundance (ecology) ,biology.animal ,parasitic diseases ,Infestation ,Mite ,medicine ,Animals ,Female ,Ecosystem ,Relative abundance distribution - Abstract
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
- Published
- 2021
7. Infestation of Oriental House Rat (Rattus tanezumi) with Chigger Mites Varies along Environmental Gradients across Five Provincial Regions of Southwest China
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Yan-Ling Chen, Xian-Guo Guo, Fan Ding, Yan Lv, Peng-Wu Yin, Wen-Yu Song, Cheng-Fu Zhao, Zhi-Wei Zhang, Rong Fan, Pei-Ying Peng, Bei Li, Ting Chen, and Dao-Chao Jin
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Health, Toxicology and Mutagenesis ,chigger mite ,rodent ,Public Health, Environmental and Occupational Health ,ectoparasite ,environmental heterogeneity ,Rattus tanezumi ,infestation - Abstract
Chigger mites are the exclusive vector of scrub typhus. Based on field investigations of 91 survey sites in 5 provincial regions of Southwest China, this paper reported variations of chigger infestation on the oriental house rat (Rattus tanezumi) along various environmental gradients. A total of 149 chigger species were identified from 2919 R. tanezumi in the 5 provincial regions, and Leptotrombidium deliense (a major vector of scrub typhus in China) was the first dominant chigger species, followed by Ascoschoengastia indica and Walchia ewingi. Rattus tanezumi had a stable overall prevalence (PM = 21.10%), mean abundance (MA = 7.01), and mean intensity (MI = 33.20) of chiggers with the same dominant mites in the whole Southwest China in comparison with a previous report in Yunnan Province, but chigger infestations on R. tanezumi varied along different environmental gradients. Rattus tanezumi in mountainous landscape had a higher infestation load of chiggers with higher species diversity than in flatland landscape. The infestation was higher at lower altitudes and latitudes. A high intensity of vegetation coverage was associated with high infestations. The results reflect the environmental heterogeneity of chiggers on the same host species. Warm climate and high relative humidity are beneficial to chigger infestation on R. tanezumi.
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- 2023
8. Faunal analysis of chigger mites (Acari: Prostigmata) on small mammals in Yunnan province, southwest China
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Peng, Pei-Ying, Guo, Xian-Guo, Ren, Tian-Guang, and Song, Wen-Yu
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- 2015
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9. Communities of gamasid mites on Eothenomys miletus in southwest China
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Peng, Pei-Ying, Guo, Xian-Guo, Song, Wen-Yu, Hou, Peng, Zou, Yun-Ji, Fan, Rong, and He, Xue-Song
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- 2015
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10. Relative Abundance of a Vector of Scrub Typhus, Leptotrombidium sialkotense, in Southern Yunnan Province, China
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Rong Fan, Cheng-Fu Zhao, Dao-Chao Jin, Xian-Guo Guo, Zhi-Hua Yang, Ke-Yu Mao, Yun-Ji Zou, Wen-Yu Song, Zhi-Wei Zhang, and Yan Lv
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China ,Zoology ,Trombiculidae ,Scrub typhus ,Disease Vectors ,medicine.disease_cause ,host selection ,Host-Parasite Interactions ,Abundance (ecology) ,Infestation ,medicine ,Mite ,Animals ,Relative species abundance ,Leptotrombidium sialkotense ,biology ,Host (biology) ,chigger mite ,rodent ,Interspecific competition ,scrub typhu ,medicine.disease ,biology.organism_classification ,Leptotrombidium ,Rats ,Infectious Diseases ,Scrub Typhus ,Original Article ,Parasitology ,vector - Abstract
The chigger mite Leptotrombidium sialkotense is one of the 6 main vectors of scrub typhus in China. Before present study, L. sialkotense was found in some parts of Hunan province, China with a narrow geographical distribution. During field investigation 2016-2017, we found L. sialkotense in Jingha, southern Yunnan, China. Of 15 small mammal host species, L. sialkotense were collected from 6 species of the hosts. Rattus brunneusculus was a dominant host of L. sialkotense, from which 98.3% of the mites were collected. The chigger mite showed a relatively high infestation prevalence (PM=11.7%) and mean abundance (MA=0.5) in comparison with the rest 5 host species. These results reveal a certain host specificity of L. sialkotense to a rat R. brunneusculus. The mite L. sialkotense showed an aggregated distribution on the host (PL. sialkotense and the body length of hosts. There was a positive interspecific association between L. sialkotense and 2 other dominant vectors, L. deliense and L. scutellare.
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- 2020
11. Infestation and Seasonal Fluctuation of Gamasid Mites (Parasitiformes: Gamasida) on Indochinese Forest Rat, Rattus andamanensis (Rodentia: Muridae) in Southern Yunnan of China
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Peng-Wu Yin, Xian-Guo Guo, Dao-Chao Jin, Wen-Yu Song, Lei Zhang, Cheng-Fu Zhao, Rong Fan, Zhi-Wei Zhang, and Ke-Yu Mao
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small mammal ,General Immunology and Microbiology ,QH301-705.5 ,Rattus ,rodent ,ectoparasite ,General Biochemistry, Genetics and Molecular Biology ,Article ,Acari ,mite ,Biology (General) ,General Agricultural and Biological Sciences - Abstract
Simple Summary Gamasid mites are a large group of arthropods and some of them are ectoparasites on the body surface of rodents and some other small mammals. Some species of ectoparasitic gamasid mites are associated with the transmission of some zoonotic diseases such as rickettsialpox and hemorrhagic fever with renal syndrome (HFRS). Based on a 12-month consecutive investigation at Jingha village in southern Yunnan of China from April 2016 to March 2017, the present paper studied the infestation and seasonal fluctuation of gamasid mites on the Indochinese forest rat, Rattus andamanensis, the most dominant species of rodent at the investigated site. The temperature and rainfall are two key factors that influence the seasonal fluctuation of the mites. Abstract A 12-month consecutive investigation was made at Jingha village in southern Yunnan of southwest China from April 2016 to March 2017. A total of 2053 Indochinese forest rats (Rattus andamanensis Blyth, 1860) were captured and examined, which account for 84.69% (2053/2424) of all the animal hosts (rodents and other small mammals) at the investigation site. And 39.82% (13,531/33,980) of gamasid mites were identified from the body surface of R. andamanensis and they belong to 41 species, 10 genera, 3 subfamilies and 2 families. Of the 41 species of gamasid mites identified from R. andamanensis, Laelaps nuttalli Hirst, 1915 and Laelaps echidninus Berlese, 1887 were the most dominant with 70.63% and 20.67% of constituent ratios respectively. In monthly fluctuations of all the gamasid mites on R. andamanensis, the constituent ratio (Cr) and overall infestation mean abundance (MA) of the mites in 12 months showed two obvious peaks in January (winter season) and June (summer season). However, the two dominant mite species, L. nuttalli and L. echidninus, showed different patterns of seasonal fluctuations. Laelaps nuttalli occurred throughout the year, and its Cr and MA showed two prominent peaks in winter season (December and January) and summer season (June), which belongs to the summer-winter type of seasonal fluctuation. Laelaps echidninus also occurred on R. andamanensis throughout the year, but its Cr and MA showed only one peak in winter season (December and January), which belongs to the winter type of seasonal fluctuation. A negative correlation existed between two climatic factors (temperature and rainfall) and the infestations (Cr, prevalence PM and MA) of two dominant mite species (L. nuttalli and L. echidninus) on R. andamanensis (p < 0.05). Temperature and rainfall are considered to be two key factors that influence the seasonal fluctuations of the mites on the studied rat species.
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- 2021
12. Analysis on infestation and related ecology of chigger mites on large Chinese voles (Eothenomys miletus) in five provincial regions of Southwest China.
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Li, Bei, Guo, Xian-Guo, Ren, Tian-Guang, Peng, Pei-Ying, Song, Wen-Yu, Lv, Yan, Yin, Peng-Wu, Liu, Zhe, Liu, Xin-Hang, and Qian, Ti-Jun
- Abstract
Based on a long-term field investigation in the five provincial regions of Southwest China between 2001 and 2019, the present paper studied the infestation and related ecology of chigger mites (chiggers) on the large Chinese vole (Eothenomys miletus), an endemic and dominant rodent species in the regions. A total of 52331 chiggers were collected from 2661 voles, and 52261 mites were identified as 185 species and 13 genera in the family Trombiculidae with very high species diversity. The identified 185 chigger species on E. miletus (a single rodent species) even exceeded those recorded in some countries. The overall infestation prevalence (P m = 53.96%), mean abundance (MA = 19.64) and mean intensity (MI = 36.39) on E. miletus were much higher than those on some other rodent species in the same regions. Although the species composition showed a moderate similarity (J = 0.63) between male and female hosts (E. miletus), the infestation indices (P m = 56.25%, MA = 21.67) of chiggers on male hosts were higher than those on the females (P m = 51.23%, MA = 17.09) (P < 0.05). Two dominant chigger species, Leptotrombidium scutellare (C r = 19.17%) and L. sinicum (C r = 11.06%), showed an aggregated distribution pattern among different individuals of their host E. miletus , and a relatively high degree of positive association existed between the two dominant chigger species with PCC = 0.57, DI = 0.60 and OI = 0.62 (x
2 = 857.46, P < 0.001). Leptotrombidium d ensipunctatum , Walchia koi , Helenicula hsui , L. scutellare and W. ewingi showed a high degree of environmental adaptability to their environments with high niche breadths. The theoretical curve of the species abundance distribution of chigger community on E. miletus was successfully fitted with Preston's lognormal distribution model. Based on the theoretical curve fitting, the expected total number of chigger species on E. miletus was roughly estimated to be 223 species, and 38 chigger species were probably missed in the sampling investigation. [Display omitted] • Chiggers are the common ectoparasites of rodents and vector of scrub typhus, Eothenomys miletus is the reservoir host and infectious source of zoonoses. • The dominant chigger specie, Leptotrombidium scutellare , is one of the main and powerful vectors of scrub typhus in China. • To study the chigger mites of E. miletus voles in such a wide geographical region. [ABSTRACT FROM AUTHOR]- Published
- 2022
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13. Acute restraint stress alters food-foraging behavior in rats: Taking the easier Way while suffered
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Jing-Zhi Su, Fang Li, Bo-Xuan Tu, Guang-Jing Zou, Wen-Juan Zhang, Yan-Hui Cui, Xiao-Lin Zhong, Xiao-Xin Yan, Chang-Qi Li, Song-Ji Li, Wen-Yu Cao, Zhao-Lan Hu, Shi-Fen Zhou, Lai-Fa Wang, and Yu Liu
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0301 basic medicine ,Male ,Restraint, Physical ,medicine.medical_specialty ,Rodent ,Epinephrine ,Foraging ,Decision Making ,Biology ,Anxiety ,Gyrus Cinguli ,Open field ,Rats, Sprague-Dawley ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,biology.animal ,medicine ,Agonistic behaviour ,Animals ,Anterior cingulate cortex ,Behavior, Animal ,General Neuroscience ,Feeding Behavior ,Social relation ,Rats ,030104 developmental biology ,Endocrinology ,medicine.anatomical_structure ,Food ,Restraint stress ,Corticosterone ,030217 neurology & neurosurgery ,Stress, Psychological ,medicine.drug - Abstract
Stress can influence decision-making in humans from many cognitive perspectives, while the underlying neurobiological mechanism remains incompletely understood. Food-foraging is a rodent behavior involving strategic possessing of nutritional supply in social context; experimental model of this behavior could help explore the effect of stress on decision-making and the brain mechanism thereof. In the present study, the influence of stress on food-foraging behavior was assessed in rats using an open field choosing paradigm wherein food collection (standard food or sweet food) were associated with social competition (with or without a rat in the cage). Acute restraint stress (ARS) was induced by placing the rat in a plastic restrainer for 2 h before food-foraging behavioral tests, with the effect of stress also determined biochemically and immunohistochemically. Restraint stressed rats showed anxiety-like behavior and elevation of serum corticosterone (CORT) and epinephrine (EPI) relative to controls. Both restraint and control animals preferred sugared food. However, the former group tended to forage food from a cage not occupied by a conspecific rat, whereas the control rats preferred to obtain food from the cage with a social competitor. Thus, the total amount of food foraged and eaten are reduced in the restrained rats than in controls. While the restraint animals had normal social interaction with other rats, they displayed enhanced social agonistic behavior. In brain examination, ARS attenuated the increase in immunolabeling and protein levels of c-fos, p-CREB, p-ERK1/2 in the anterior cingulate cortex (ACC) observed in control animals in association with food-foraging. These results indicate that restraint stressed rats tend to forage food by taking the advantage of a less competitive opportunity. Mechanistically, this decision-making alternative appears to be mediated through a neuronal deactivation in the ACC. The current findings provide novel insights into neuronal processing of decision-making behavior under the influence of stress.
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- 2018
14. Distribution and host selection of the chigger mite vector of scrub typhus, Leptotrombidium deliense, in southwest China.
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Lv, Yan, Guo, Xian-Guo, Jin, Dao-Chao, Fan, Rong, Zhao, Cheng-Fu, Zhang, Zhang-Wei, Mao, Ke-Yu, Song, Wen-Yu, Dong, Wen-Ge, Qian, Ti-Jun, and Yang, Zhi-Hua
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TSUTSUGAMUSHI disease ,RATTUS rattus ,MURIDAE ,ALTITUDES ,ZOOGEOGRAPHY ,RATS ,MITES ,RODENTS - Abstract
Leptotrombidium deliense (Walch) is believed to be the most important vector of scrub typhus in China. From 2001–2019, a long-term investigation was made in 82 counties of southwestern China, covering five provincial divisions: Yunnan, Guizhou, Sichuan, Tibet and Chongqing. The results showed that L. deliense was not the most dominant chigger species in southwestern China. A total of 8,385 L. deliense were collected from 13 counties, which accounted for only 5.42% of all the identified chiggers (299 species with 154,665 individuals). Leptotrombidium deliense was mainly distributed in the low latitude (21–22°N: 48.16%), low elevation (<1000 m: 81.75%), flat landscape (70.14%) and outdoor habitat (90.66%). Although 73.98% of L. deliense were collected from the Asian house rat (Rattus tanezumi), the mite had low host specificity, being collected from 22 species of rodents and other small mammals across different species, genera, families and orders. Leptotrombidium deliense was of an aggregated distribution among its animal hosts. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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15. A Dormouse (Gliridae, Rodentia) from Yushe Basin
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Wen-Yu Wu
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Geography ,Taxon ,Pleistocene ,Rodent ,biology ,Ecology ,biology.animal ,North china ,Dryomys ,Structural basin ,Dormouse ,China ,biology.organism_classification - Abstract
This work documents the first dormouse known as a component of the Pliocene small mammal assemblages of Yushe Basin, Shanxi Province. It is the youngest dormouse in the Chinese fossil record. Due to their small body size and tiny teeth, dormice are generally underrepresented in fossil assemblages, and were previously unknown in Yushe Basin. The technique of screen-washing allowed the Sino-American field team to recover a single specimen in 1988. It represents a species of dormouse that may be identical with the taxon recorded to the north at the older sites of Ertemte and Bilike in Inner Mongolia. It is currently unknown whether more than one lineage of dormouse characterized the paleocommunities of Shanxi Province, and whether they were present throughout the Miocene of China. The occurrence of this group is consistent with a stable ecology promoting high rodent diversity during the Pliocene of Yushe Basin. Dormice are not yet known from Pleistocene deposits of North China, and in China today, the only known representatives are Dryomys in Xinjiang and Chaetocauda in Sichuan Province.
- Published
- 2017
16. Relative Abundance of a Vector of Scrub Typhus, Leptotrombidium sialkotense, in Southern Yunnan Province, China.
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Yan Lv, Xian-Guo Guo, Dao-Chao Jin, Wen-Yu Song, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Yun-Ji Zou, and Zhi-Hua Yang
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TSUTSUGAMUSHI disease ,MITES ,RATS ,PROVINCES - Abstract
The chigger mite Leptotrombidium sialkotense is one of the 6 main vectors of scrub typhus in China. Before present study, L. sialkotense was found in some parts of Hunan province, China with a narrow geographical distribution. During field investigation 2016-2017, we found L. sialkotense in Jingha, southern Yunnan, China. Of 15 small mammal host species, L. sialkotense were collected from 6 species of the hosts. Rattus brunneusculus was a dominant host of L. sialkotense, from which 98.3% of the mites were collected. The chigger mite showed a relatively high infestation prevalence (PM=11.7%) and mean abundance (MA=0.5) in comparison with the rest 5 host species. These results reveal a certain host specificity of L. sialkotense to a rat R. brunneusculus. The mite L. sialkotense showed an aggregated distribution on the host (P<0.05). A positive correlation observed between L. sialkotense and the body length of hosts. There was a positive interspecific association between L. sialkotense and 2 other dominant vectors, L. deliense and L. scutellare. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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17. Ectoparasitic insects and mites on Yunnan red-backed voles (Eothenomys miletus) from a localized area in southwest China
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Xian Guo Guo, Dian Wu, Wen-Ge Dong, Wen-Yu Song, Feng Qin, Ti-Jun Qian, Xing-Yuan Men, and John R. Speakman
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Male ,China ,Rodent ,Population ,Zoology ,Ectoparasitic Infestations ,Abundance (ecology) ,biology.animal ,parasitic diseases ,Phthiraptera ,Parasite hosting ,Animals ,education ,Relative abundance distribution ,education.field_of_study ,Mites ,General Veterinary ,biology ,Ecology ,Host (biology) ,Arvicolinae ,General Medicine ,biology.organism_classification ,Infectious Diseases ,Insect Science ,Siphonaptera ,Parasitology ,Vole ,Female - Abstract
Ectoparasitic insects and mites on Yunnan red-backed voles (Eothenomys miletus) in Dali prefecture, Yunnan Province, southwest China, were studied between 2003 and 2004. In total, 34,389 individuals of 86 species of ectoparasitic insects (seven species of fleas and five species of sucking lice) and mites (23 species of gamasid mites and 51 species of chigger mites) were collected from 916 individual hosts. The diversity of ectoparasites on this single rodent species in such a small area was much higher than in previous reports, which concerned more host species and greater geographical areas. The majority of the ectoparasites were chigger mites, which accounted for 59.3% of the parasite species and 87.4% of the individual parasites. Most voles harbored parasites with an overall prevalence (P) of 82.5% and mean abundance (MA) of 37.5 parasites per host. The dispersion coefficient (C) and patchiness index (m*/m) were used to study the spatial patterns of the seven dominant parasite species, and all seven had aggregated distributions. The species abundance distribution of the ectoparasites on the vole was fitted by Preston's lognormal distribution (R (2) = 0.82), and the total expected parasite species was estimated from this plot as 167 species. Yunnan red-backed voles harbor many ectoparasites as revealed by examination of a large host population. Future field investigations should sample large numbers of host individuals to assess ectoparasite populations.
- Published
- 2013
18. Infestation and Seasonal Fluctuation of Gamasid Mites (Parasitiformes: Gamasida) on Indochinese Forest Rat, Rattus andamanensis (Rodentia: Muridae) in Southern Yunnan of China.
- Author
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Yin, Peng-Wu, Guo, Xian-Guo, Jin, Dao-Chao, Song, Wen-Yu, Zhang, Lei, Zhao, Cheng-Fu, Fan, Rong, Zhang, Zhi-Wei, and Mao, Ke-Yu
- Subjects
MURIDAE ,HEMORRHAGIC fever with renal syndrome ,PARASITIFORMES ,RATS ,MITES ,RODENTS - Abstract
Simple Summary: Gamasid mites are a large group of arthropods and some of them are ectoparasites on the body surface of rodents and some other small mammals. Some species of ectoparasitic gamasid mites are associated with the transmission of some zoonotic diseases such as rickettsialpox and hemorrhagic fever with renal syndrome (HFRS). Based on a 12-month consecutive investigation at Jingha village in southern Yunnan of China from April 2016 to March 2017, the present paper studied the infestation and seasonal fluctuation of gamasid mites on the Indochinese forest rat, Rattus andamanensis, the most dominant species of rodent at the investigated site. The temperature and rainfall are two key factors that influence the seasonal fluctuation of the mites. A 12-month consecutive investigation was made at Jingha village in southern Yunnan of southwest China from April 2016 to March 2017. A total of 2053 Indochinese forest rats (Rattus andamanensis Blyth, 1860) were captured and examined, which account for 84.69% (2053/2424) of all the animal hosts (rodents and other small mammals) at the investigation site. And 39.82% (13,531/33,980) of gamasid mites were identified from the body surface of R. andamanensis and they belong to 41 species, 10 genera, 3 subfamilies and 2 families. Of the 41 species of gamasid mites identified from R. andamanensis, Laelaps nuttalli Hirst, 1915 and Laelaps echidninus Berlese, 1887 were the most dominant with 70.63% and 20.67% of constituent ratios respectively. In monthly fluctuations of all the gamasid mites on R. andamanensis, the constituent ratio (C
r ) and overall infestation mean abundance (MA) of the mites in 12 months showed two obvious peaks in January (winter season) and June (summer season). However, the two dominant mite species, L. nuttalli and L. echidninus, showed different patterns of seasonal fluctuations. Laelaps nuttalli occurred throughout the year, and its Cr and MA showed two prominent peaks in winter season (December and January) and summer season (June), which belongs to the summer-winter type of seasonal fluctuation. Laelaps echidninus also occurred on R. andamanensis throughout the year, but its Cr and MA showed only one peak in winter season (December and January), which belongs to the winter type of seasonal fluctuation. A negative correlation existed between two climatic factors (temperature and rainfall) and the infestations (Cr , prevalence PM and MA) of two dominant mite species (L. nuttalli and L. echidninus) on R. andamanensis (p < 0.05). Temperature and rainfall are considered to be two key factors that influence the seasonal fluctuations of the mites on the studied rat species. [ABSTRACT FROM AUTHOR]- Published
- 2021
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19. Infestation and distribution of chiggers on the Anderson's white‐bellied rats in southwest China
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Yu Guo, Xian‐Guo Guo, Pei‐Ying Peng, Yan Lv, Rong Xiang, Wen‐Yu Song, and Xiao‐Bin Huang
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acari ,chigger mites ,ectoparasite ,Niviventer andersoni ,rodent ,southwest China ,Veterinary medicine ,SF600-1100 - Abstract
Abstract As a group of ectoparasites, chiggers (larvae of chigger mites) are the exclusive vector of scrub typhus (tsutsugamushi disease). Rodents are the most important hosts of chiggers. The Anderson's niviventer rat, Niviventer andersoni, is an endemic species of rodent in China. However, few studies have involved this endemic rodent species and its ectoparasites including chiggers. According to the field investigation in five provincial regions of southwest China between 2001 and 2019, this paper retrospectively analysed the infestation and distribution of chiggers on the body surface of N. andersoni in southwest China for the first time. From 77 Anderson's niviventer rats captured, a total of 527 chiggers were collected and they were identified as 39 species and nine genera in two subfamilies of family Trombiculidae. Of 39 chigger species identified, Leptotrombidium deliense and L. scutellare are the most important vectors of scrub typhus in China. The overall infestation indexes were PM = 29.87%, MA = 6.84 and MI = 22.91, and the indexes of chigger mite community were Mf = 39, H' = 2.60, E = 0.71 and D = 0.12. The dominant chigger species are L. wenense, L. xiaguanense and L. fujianense with a total Cr = 51.04%, among which L. wenense is one of the six main vectors of scrub typhus in China. The dominant chigger species are of aggregated distribution among different individuals of the rats.
- Published
- 2023
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20. Analysis on infestation and related ecology of chigger mites on large Chinese voles (Eothenomys miletus) in five provincial regions of Southwest China
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Bei Li, Xian-Guo Guo, Tian-Guang Ren, Pei-Ying Peng, Wen-Yu Song, Yan Lv, Peng-Wu Yin, Zhe Liu, Xin-Hang Liu, and Ti-Jun Qian
- Subjects
Acari ,Chigger mite ,Trombiculidae ,Ectoparasite ,Rodent ,Eothenomys miletus ,Zoology ,QL1-991 - Abstract
Based on a long-term field investigation in the five provincial regions of Southwest China between 2001 and 2019, the present paper studied the infestation and related ecology of chigger mites (chiggers) on the large Chinese vole (Eothenomys miletus), an endemic and dominant rodent species in the regions. A total of 52331 chiggers were collected from 2661 voles, and 52261 mites were identified as 185 species and 13 genera in the family Trombiculidae with very high species diversity. The identified 185 chigger species on E. miletus (a single rodent species) even exceeded those recorded in some countries. The overall infestation prevalence (Pm = 53.96%), mean abundance (MA = 19.64) and mean intensity (MI = 36.39) on E. miletus were much higher than those on some other rodent species in the same regions. Although the species composition showed a moderate similarity (J = 0.63) between male and female hosts (E. miletus), the infestation indices (Pm = 56.25%, MA = 21.67) of chiggers on male hosts were higher than those on the females (Pm = 51.23%, MA = 17.09) (P
- Published
- 2022
- Full Text
- View/download PDF
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