Topic
Vesper mouse
About: Vesper mouse is a research topic. Over the lifetime, 14 publications have been published within this topic receiving 201 citations. The topic is also known as: Calomys.
Papers
TL;DR: Chickens (the only avian host used in the present study) showed to be moderately suitable hosts for subadult A. ovale ticks, indicating that wild birds might have a secondary role in the life history of A. Ovale.
Abstract: This study evaluated for the first time the life cycle of Amblyomma ovale in the laboratory. For this purpose, larvae and nymphs were exposed to Gallus gallus (chickens), Cavia porcellus (guinea pigs), Rattus norvegicus (wistar rats), Oryctolagus cuniculus (domestic rabbits), Calomys callosus (vesper mouse), and Didelphis albiventris (white-eared opossum). Nymphs were also exposed to Nectomys squamipes (South American water rat). Adult ticks were fed on dogs. The life-cycle of A. ovale in laboratory could be completed in an average period of ca. 190 days, considering prefeeding periods of 30 days for each of the parasitic stages. Vesper mice were the most suitable host for A. ovale larvae, whereas water rats were the most suitable host for A. ovale nymphs. Our results, coupled with literature data, strongly indicate that small rodents have an important role in the life history of A. ovale. Chickens (the only avian host used in the present study) showed to be moderately suitable hosts for subadult A. ovale ticks, indicating that wild birds might have a secondary role in the life history of A. ovale. Domestic dogs showed to be highly suitable for the adult stage of A. ovale, in agreement with literature data that indicate that the domestic dog is currently one of the most important hosts of A. ovale adult ticks in Latin America.
40 citations
TL;DR: Spatial analysis using a clustering method and the Monmonier's algorithm suggested that the Rio São Francisco is a biogeographic barrier to gene flow and indicated that this river may play a role in the incipient speciation process of these subpopulations.
Abstract: Riverine barriers have been associated to genetic diversification and speciation of several taxa. The Rio Sao Francisco is one of the largest rivers in South America, representing the third largest river basin in Brazil and operating as a geographic barrier to gene flow of different taxa. To evaluate the influence of the Rio Sao Francisco in the speciation of small rodents, we investigated the genetic structure of Calomys expulsus with phylogenetic and network analyses of cytochrome b DNA. Our results suggested that C. expulsus can be divided into 3 subpopulations, 2 on the left and another one on the right bank of this river. The time of divergence of these subpopulations, using a Bayesian framework, suggested colonization from the south to the north/northeast. Spatial analysis using a clustering method and the Monmonier's algorithm suggested that the Rio Sao Francisco is a biogeographic barrier to gene flow and indicated that this river may play a role in the incipient speciation process of these subpopulations.
34 citations
Journal Article•
TL;DR: It can be concluded that the laboratory rats were the source of this human infection and the presence of Hantavirus infection is reported for the first time in wild C. musculinus and in laboratory R. norvegicus in Argentina.
Abstract: Serum samples from urban and laboratory rats, laboratory mice and wild and laboratory cricetids in Argentina were tested by immunofluorescence and plaque reduction neutralization tests to investigate prevalence of anti-Hantavirus antibodies. A total of 102 sera were obtained from laboratory rodents in 4 different animal-rooms, 31 from harbor rats and 30 from wild cricetids in 1985-1987. Anti-Hantavirus antibodies were detected in 22.5% of Rattus norvegicus in 3 of the animal-rooms but harbor rats were found to be free of Hantavirus infection. Previously, the presence of anti-Hantavirus antibodies had been demonstrated in the sera obtained from laboratory workers in these same 3 animal-rooms; it can be concluded that the laboratory rats were the source of this human infection. On the contrary, laboratory mice and cricetids failed to show Hantavirus infection while the wild vesper mouse Calomys musculinus (the main Junin virus reservoir) showed a prevalence of 23.5%. The presence of Hantavirus infection is hereby reported for the first time in wild C. musculinus and in laboratory R. norvegicus in Argentina.
26 citations
1 Jan 1972
17 citations
TL;DR: To answer the question if the nominal species C. laucha constitutes a single genetic unit or if it presents genetic discontinuities that may relate to hosting LNV, the cytochrome b (cyt b) gene of specimens from throughout the range of the distribution of the species was sequenced.
Abstract: The small vesper mouse (Calomys laucha (Fischer, 1814)) (Cricetidae: Sigmodontinae) ranges widely in Brazil, Uruguay, Paraguay, Argentina, and Bolivia. The species is the reservoir of the Laguna Negra hantavirus (LNV) in Paraguay but not in Argentina, where it is one of the most abundant rodents in agro-pastoral ecosystems. To answer the question if the nominal species C. laucha constitutes a single genetic unit or if it presents genetic discontinuities that may relate to hosting LNV, we sequenced the cytochrome b (cyt b) gene of specimens from throughout the range of the distribution of the species. Phylogenetic analyses revealed two well-supported clades. Twenty-two sequences from Argentina, Paraguay, and Bolivia grouped in clade A, but three sequences from Uruguay and Brazil clustered in a quite divergent clade B. The genetic distance between the two groups is 5.75%. No significant differences between Argentinean, Paraguayan, and Bolivian specimens assigned to C. laucha were detected. The restricted di...
15 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
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| 2021 | 1 |
| 2018 | 1 |
| 2014 | 1 |
| 2013 | 1 |
| 2012 | 1 |
| 2011 | 1 |