Relationship between environmental factors and the spatial distribution of Spermophilus dauricus during 2000–2015 in China

Tian, Lide

doi:10.1007/s00484-018-1580-9

Cited by 9 publications

(5 citation statements)

References 24 publications

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“…Rodents are the main hosts of many human pathogens and can indirectly transmit vector-borne intracellular bacteria to humans, such as Rickettsiales and Bartonella ( Han et al, 2015 ). The Daurian ground squirrel is a wild rodent species mainly distributed in northern China, Mongolia, and Russia and is a host of Yersinia pestis ( Zhou et al, 2004a , b ; Tian, 2018 ). Daurian ground squirrels frequently come into contact with herders, which can increase the risk of plague transmission in humans.…”

Section: Discussionmentioning

confidence: 99%

Anaplasma, Bartonella, and Rickettsia infections in Daurian ground squirrels (Spermophilus dauricus), Hebei, China

Xue,

Chen,

et al. 2024

Front. Microbiol.

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Rodents have been confirmed as hosts of various vector-borne zoonotic pathogens and are important for the maintenance of these microbes in nature. However, surveillance for zoonotic pathogens is limited for many wild rodent species in China, so our knowledge of pathogen ecology, genetic diversity, and the risk of cross-species transmission to humans is limited. In this study, 165 spleen samples of Daurian ground squirrels (Spermophilus dauricus) were collected from Weichang Manchu and the Mongolian Autonomous County of Hebei Province, China, and Rickettsia, Bartonella, and Anaplasma were identified by DNA detection using polymerase chain reaction (PCR). Sequence analysis identified eight bacterial pathogens: R. raoultii, R. sibirica, Candidatus R. longicornii, B. washoensis, B. grahamii, B. jaculi, A. capra, and Candidatus Anaplasma cinensis. Co-infection of B. grahamii and R. raoultii in one sample was observed. Our results demonstrated the genetic diversity of bacteria in Daurian ground squirrels and contributed to the distribution of these pathogens. Six species, A. capra, R. raoultii, R. sibirica, Candidatus R. longicornii, B. washoensis, and B. grahamii, are known to be pathogenic to humans, indicating a potential public health risk to the local human population, especially to herders who frequently have close contact with Daurian ground squirrels and are thus exposed to their ectoparasites.

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Section: Discussionmentioning

confidence: 99%

Anaplasma, Bartonella, and Rickettsia infections in Daurian ground squirrels (Spermophilus dauricus), Hebei, China

Xue,

Chen,

et al. 2024

Front. Microbiol.

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“…S. dauricus is a medium-sized, diurnal rodent widely distributed in grasslands of northeastern Asia [32]. As a well-known host of fleas and ticks, S. dauricus often acts as an important transmitter of plague [13,33]. In a previous study, we found that fleas and ticks possessed distinct distribution patterns on S. dauricus, suggesting that the underlying mechanisms of parasitism may also differ between these two types of ectoparasites [13].…”

Section: Introductionmentioning

confidence: 93%

Complex effects of testosterone level on ectoparasite load in a ground squirrel: an experimental test for the immunocompetence handicap hypothesis

Wang,

Liu,

Wang

et al. 2024

Parasites Vectors

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Background The immunocompetence handicap hypothesis suggests that males with a higher testosterone level should be better at developing male secondary traits, but at a cost of suppressed immune performance. As a result, we should expect that males with an increased testosterone level also possess a higher parasite load. However, previous empirical studies aimed to test this prediction have generated mixed results. Meanwhile, the effect of testosterone level on parasite load in female hosts remains poorly known. Methods In this study, we tested this prediction by manipulating testosterone level in Daurian ground squirrels (Spermophilus dauricus), a medium-sized rodent widely distributed in northeast Asia. S. dauricus is an important host of ticks and fleas and often viewed as a considerable reservoir of plague. Live-trapped S. dauricus were injected with either tea oil (control group) or testosterone (treatment group) and then released. A total of 10 days later, the rodents were recaptured and checked for ectoparasites. Fecal samples were also collected to measure testosterone level of each individual. Results We found that testosterone manipulation and sex of hosts interacted to affect tick load. At the end of the experiment, male squirrels subjected to testosterone implantation had an averagely higher tick load than males from the control group. However, this pattern was not found in females. Moreover, testosterone manipulation did not significantly affect flea load in S. dauricus. Conclusions Our results only lent limited support for the immunocompetence handicap hypothesis, suggesting that the role of testosterone on regulating parasite load is relatively complex, and may largely depend on parasite type and gender of hosts. Graphical Abstract

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“…Moreover, because their diet is similar to that of livestock, it further reduces agricultural economic benefits (Guiming et al, 1992). Furthermore, BV plays a crucial role as a significant repository and means of spreading Yersinia pestis, the pathogen responsible for the plague (Khan and Young, 2001;Addink et al, 2010;Tian, 2018). The most renowned plague is the Black Death, a cataclysmic epidemic that inflicted unparalleled destruction during the mid-14th century (Addink et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Detection and classification of Brandt’s vole burrow clusters utilizing GF-2 satellite imagery and faster R-CNN model

Sun,

Bao,

Bao

et al. 2024

Front. Ecol. Evol.

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Most small rodent populations worldwide exhibit fascinating population dynamics, capturing the attention of numerous scholars due to their multiyear cyclic fluctuations in population size and the astonishing amplitude of these fluctuations. Hulunbuir steppe stands as a crucial global hub for livestock production, yet in recent decades, the area has faced recurring challenges from steppes rodent invasions, with Brandt’s vole (Lasiopodomys brandtii, BV) being particularly rampant among them. They not only exhibit seasonal reproduction but also strong social behavior, and are generally considered pests, especially during population outbreak years. Prior studies suggest that BV population outbreaks tend to occur across a wider geographic area, and a strong indicator for identifying rodent outbreaks is recognizing their burrow clusters (burrow systems). Hence, this paper conducts target object detection of BV burrow clusters in the typical steppes of Hulunbuir using two GF-2 satellite images from 2021 (the year of the BV outbreak). This task is accomplished by incorporating the Faster R-CNN model in combination with three detection approaches: object-based image classification (OBIC), based on vegetation index classification (BVIC), and based on texture classification (BTC). The results indicate that OBIC demonstrated the highest robustness in BV burrow cluster detection, achieving an average AP of 63.80% and an F1 score of 0.722 across the two images. BTC exhibited the second-highest level of accuracy, achieving an average AP of 55.95% and an F1 score of 0.6660. Moreover, this approach displayed a strong performance in BV burrow clusters localization. In contrast, BVIC achieved the lowest level of accuracy among the three methods, with an average AP of only 29.45% and an F1 score of 0.4370. Overall, this study demonstrates the crucial role of utilizing high-resolution satellite imagery combined with DL-based object detection techniques in effectively monitoring and managing the potential outbreaks of steppe rodent pests across larger spatial extents.

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Relationship between environmental factors and the spatial distribution of Spermophilus dauricus during 2000–2015 in China

Cited by 9 publications

References 24 publications

Anaplasma, Bartonella, and Rickettsia infections in Daurian ground squirrels (Spermophilus dauricus), Hebei, China

Anaplasma, Bartonella, and Rickettsia infections in Daurian ground squirrels (Spermophilus dauricus), Hebei, China

Complex effects of testosterone level on ectoparasite load in a ground squirrel: an experimental test for the immunocompetence handicap hypothesis

Detection and classification of Brandt’s vole burrow clusters utilizing GF-2 satellite imagery and faster R-CNN model

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