| a new allopatric lineage of the rodent deltamys (rodentia: sigmodontinae) and the chromosomal evolution in deltamys kempi and deltamys sp. | deltamys thomas 1917 is a poorly studied and rarely collected taxon of akodontini (sigmodontinae). the single described species, deltamys kempi (dke), has a basic karyotype with a diploid number of 2n = 37 in males and 2n = 38 in females, a fundamental number fn = 38 for both sexes, and an x(1)x(1)x(2)x(2)/x(1)x(2)y sex determination system. herein, a new allopatric form, deltamys sp. (dsp), is reported, based on specimens from southern brazil, with 2n = 40, fn = 40 and xx/xy sex chromosomes. we ... | 2011 | 21934291 |
| ecological study of hantavirus infection in wild rodents in an endemic area in brazil. | a 3-year ecological study of small mammals was carried out in an endemic area for hantavirus pulmonary syndrome in the state of santa catarina in southern brazil. a total of 994 rodents of 14 different species corresponding to the subfamilies of sigmodontinae, murinae, eumysopinae, and caviinae were captured during 2004-2006. oligoryzomys nigripes and akodon montensis were the most abundant species and showed a clear seasonal pattern with higher population sizes during the winter. rodent populat ... | 2014 | 24291677 |
| detection of the first incidence of akodon paranaensis naturally infected with the jabora virus strain (hantavirus) in brazil. | we characterised hantaviruses circulating in different akodon rodent species collected in midwestern santa catarina (sc), southern brazil, where the jabora hantavirus (jabv) strain was first identified in akodon montensis. genetic and phylogenetic analyses based on a partial s segment indicated that, in sc, akodon paranaensis and a. montensis carried the same type of hantavirus. additionally, we conducted the first genomic characterisation of the complete s segment from the brazilian jabv strain ... | 2012 | 22510841 |
| genetic characterization of hantaviruses associated with sigmodontine rodents in an endemic area for hantavirus pulmonary syndrome in southern brazil. | an ecological assessment of reservoir species was conducted in a rural area (jaborá) in the mid-west of the state of santa catarina in southern brazil, where hantavirus pulmonary syndrome is endemic, to evaluate the prevalence of hantavirus infection in wild rodents. blood and tissue samples were collected from 507 rodents during seven field trips from march 2004 to april 2006. some of the animals were karyotyped to confirm morphological identification. phylogenetic reconstructions of rodent spe ... | 2010 | 21138380 |
| habitat associations of small mammals in southern brazil and use of regurgitated pellets of birds of prey for inventorying a local fauna. | we inventoried terrestrial small mammals in an agricultural area in southern brazil by using trapping and prey consumed by barn owls (tyto alba) and white-tailed kites (elanus leucurus). small mammals were trapped in three habitat types: corn fields, uncultivated fields ("capoeiras"), and native forest fragments. a total of 1,975 small mammal specimens were trapped, another 2,062 identified from the diet of barn owls, and 2,066 from the diet of white-tailed kites. both trapping and prey in the p ... | 2007 | 18278312 |
| variable patterns of y chromosome homology in akodontini rodents (sigmodontinae): a phylogenetic signal revealed by chromosome painting. | the akodontini is the second most speciose tribe of sigmodontine rodents, one of the most diverse groups of neotropical mammals. molecular phylogenetic analyses are discordant regarding the interrelationships of genera, with low support for some clades. however, two clades are concordant, one (clade a) with akodon sensu strictu (excluding akodon serrensis), "akodon" serrensis, bibimys, deltamys, juscelinomys, necromys, oxymycterus, podoxymys, thalpomys and thaptomys, and another (clade b) with b ... | 2012 | 22711265 |
| hantavirus infection prevalence in wild rodents and human anti-hantavirus serological profiles from different geographic areas of south brazil. | paraná state presents the fourth highest number of accumulated cases of hantavirus pulmonary syndrome in brazil. to map the risk areas for hantavirus transmission we carried out a study based on rodent trapping and determined the anti-hantavirus seroprevalence in these animals and in the inhabitants of these localities. overall seroprevalence in rodents and humans were 2.5% and 2.4%, respectively. eighty-two percent of the seropositive rodents were genetically analyzed. phylogenetic analyses rev ... | 2012 | 22855773 |
| characterization of juquitiba virus in oligoryzomys fornesi from brazilian cerrado. | the juquitiba virus, an agent of hantavirus cardiopulmonary syndrome, is one of the most widely distributed hantavirus found in south america. it has been detected in oligoryzomys nigripes, akodon montensis, oxymycterus judex, akodon paranaensis in brazil and in o. nigripes, oryzomys sp. and oligoryzomys fornesi rodents in argentine, paraguay and uruguay. here, we report the genomic characterization of the complete s segment from the juquitiba strain, isolated from the lung tissues of o. fornesi ... | 2014 | 24674957 |
| chromosome homologies of the highly rearranged karyotypes of four akodon species (rodentia, cricetidae) resolved by reciprocal chromosome painting: the evolution of the lowest diploid number in rodents. | traditionally comparative cytogenetic studies are based mainly on banding patterns. nevertheless, when dealing with species with highly rearranged genomes, as in akodon species, or with other highly divergent species, cytogenetic comparisons of banding patterns prove inadequate. hence, comparative chromosome painting has become the method of choice for genome comparisons at the cytogenetic level since it allows complete chromosome probes of a species to be hybridized in situ onto chromosomes of ... | 2009 | 19936950 |
| population ecology of hantavirus rodent hosts in southern brazil. | in this study we analyze population dynamics of hantavirus rodent hosts and prevalence of infection over a 2-year period in southern brazil, a region with a high incidence of hantavirus pulmonary syndrome. the 14 small mammal species captured were composed of 10 rodents and four marsupials, the six most abundant species being akodon serrensis, oxymycterus judex, akodon montensis, akodon paranaensis, oligoryzomys nigripes, and thaptomys nigrita. these species displayed a similar pattern with incr ... | 2014 | 24935954 |