| besnoitia sp. (protozoa:toxoplasmatinae) from akodon montensis (rodentia:cricetidae) in santa catarina state, brazil. | tissue cysts of besnoitia sp. were found in muscles and several organs from a naturally infected akodon montensis captured in the rural area of the municipality of timbó, santa catarina state, in southern brazil. indirect fluorescence and enzyme-linked immunosorbent assays carried out with sera from mice chronically infected with toxoplasma gondii and besnoitia sp. showed, as expected, a stronger reaction against homologous than heterologous antigens. no cross-protection was observed in mice imm ... | 1997 | 9105318 |
| x;y translocation revealed by chromosome microdissection and fish in fertile xy females in the brazilian rodent akodon montensis. | in a brazilian population of the neotropical rodent akodon montensis we found five sex-reversed xy females. these animals were cytogenetically analyzed by chromosome painting using species-specific dna probes from the y chromosome, generated by chromosomal microdissection and subsequent use of the degenerate oligonucleotide-primed polymerase chain reaction (dop-pcr). the results showed a chromosome complement with an apparently normal y chromosome and an x chromosome carrying a translocation tha ... | 2000 | 10773685 |
| biological and molecular characterization of besnoitia akodoni n.sp. (protozoa: apicomplexa) from the rodent akodon montensis in brazil. | the diversity among coccidian parasites of the genus besnoitia is incompletely known. of the eight currently described members of the genus, only b. jellisoni is known to parasitize a rodent host. here, we propose a new name, besnoitia akodoni, for the species initially isolated form the rodent akodon montensis in brazil. the tissue cysts of b. akodoni were up to 442 microm in diameter and bradyzoites were 8.4 x 1.4 microm in size. the bradyzoites contained enigmatic bodies, micronemes and rhopt ... | 2003 | 15266998 |
| b chromosomes in brazilian rodents. | b chromosomes are now known in eight brazilian rodent species: akodon montensis, holochilus brasiliensis, nectomys rattus, n. squamipes, oligoryzomys flavescens, oryzomys angouya, proechimys sp. 2 and trinomys iheringi. typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of nors, and presence/absence of interstitial telomeric signals after fish. in most cases, bs are heterochromatic and late replicating. active nors were detected in two ... | 2004 | 15292600 |
| phylogenetic and geographical relationships of hantavirus strains in eastern and western paraguay. | recently, we reported the discovery of several potential rodent reservoirs of hantaviruses in western (holochilus chacarius) and eastern paraguay (akodon montensis, oligoryzomys chacoensis, and o. nigripes). comparisons of the hantavirus s- and m-segments amplified from these four rodents revealed significant differences from each another and from other south american hantaviruses. the alp strain from the semiarid chaco ecoregion clustered with leguna negra and rio mamore (ln/rm), whereas the bm ... | 2006 | 17172380 |
| small mammal populations of an agroecosystem in the atlantic forest domain, southeastern brazil. | this study reports 2 years of the population dynamics and reproduction of a small mammal community using the removal method. the study was conducted in a rural area of the atlantic forest, in sumidouro, rio de janeiro state, brazil. the population sizes, age structure and reproduction were studied for the four most common species in the study area. the overall diversity was 1.67 and ranged between 0.8 to 1.67. the species richness was 13 considering the whole study. the most abundant species wer ... | 2007 | 17505767 |
| phylogenetic characterization of hantaviruses from wild rodents and hantavirus pulmonary syndrome cases in the state of parana (southern brazil). | over 1,100 cases of hantavirus pulmonary syndrome (hps) have occurred in brazil since 1993, but little is known about brazilian hantaviruses, and many of their rodent hosts remain unknown. the araucaria hantavirus (arauv) was described recently from hps patients from paraná, in southern brazil, but its host could not be identified. in this study, rodents were captured from regions with high hps prevalence to address this issue. arauv rna was detected in three distantly related rodent species: ol ... | 2009 | 19439554 |
| a new metastrongilid species (nematoda: metastrongylidae): a lungworm from akodon montensis (rodentia: sigmodontinae) in brazil. | angiostrongylus lenzii n. sp. (nematoda: metastrongyloidea) is described and illustrated from the pulmonary artery of the wild rodent akodon montensis thomas, 1913, collected in the municipality of teresopólis, rio de janeiro state, brazil. it represents the 17th species of the genus and the 2nd in south america as parasites in rodents. this new species is the most similar morphologically to angiostrongylus vasorum, angiostrongylus gubernaculatus, angiostrongylus schmidti, and angiostrongylus mo ... | 2009 | 19566346 |
| microhabitat characteristics of akodon montensis, a reservoir for hantavirus, and hantaviral seroprevalence in an atlantic forest site in eastern paraguay. | hantaviruses may cause serious disease when transmitted to humans by their rodent hosts. since their emergence in the americas in 1993, there have been extensive efforts to understand the role of environmental factors on the presence of these viruses in their host rodent populations. hps outbreaks have been linked to precipitation, but climatic factors alone have not been sufficient to predict the spatial-temporal dynamics of the environment-reservoir-virus system. using a series of mark-recaptu ... | 2009 | 20836810 |
| 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 |
| detection of hantaviruses in brazilian rodents by sybr-green-based real-time rt-pcr. | current knowledge of the pathogenic hantavirus indicates that wild rodents are its primary natural reservoir. specific primers to detect the presence of viral genomes were developed using an sybr-green-based real-time rt-pcr protocol. one hundred sixty-four rodents native to the atlantic forest biome were captured in são paulo state, brazil, and their tissues were tested. the presence of hantavirus rna was detected in sixteen rodents: three specimens of akodon montensis, three of akodon cursor, ... | 2011 | 21442233 |
| new species of trichuris (nematoda: trichuridae) from akodon montensis thomas, 1913, of the paranaense forest in argentina. | abstract species of trichuris (nematoda: trichuridae) parasitize a broad range of mammalian hosts. to date, 21 trichuris species infecting nine families of rodents have been found in north and south america. trichuris navonae n. sp. is described on the basis of specimens recovered from a species of forest-dwelling mice, akodon montensis (cricetidae: sigmodontinae), from nine localities of misiones province, argentina. a comparison with all the species of trichuris from north and south american r ... | 2011 | 21506781 |
| phylogenetic exploration of hantaviruses in paraguay reveals reassortment and host switching in south america. | abstract: | 2011 | 21838900 |
| 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 |
| new host, geographic records, and histopathologic studies of angiostrongylus spp (nematoda: angiostrongylidae) in rodents from argentina with updated summary of records from rodent hosts and host specificity assessment. | to date, 21 species of the genus angiostrongylus (nematoda: angiostrongylidae) have been reported around the world, 15 of which are parasites of rodents. in this study, new host, geographic records, and histopathologic studies of angiostrongylus spp in sigmodontine rodents from argentina, with an updated summary of records from rodent hosts and host specificity assessment, are provided. records of angiostrongylus costaricensis from akodon montensis and angiostrongylus morerai from six new hosts ... | 2016 | 26982178 |
| 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 |
| 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 |
| 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 |
| the role of sigmodontine rodents as sylvatic hosts of trypanosoma cruzi in the argentinean chaco. | the role of rodents in the sylvatic transmission of trypanosoma cruzi has seldom been investigated using parasitological and molecular methods. we assessed the occurrence of t. cruzi in wild small rodents from pampa del indio, in the argentinean chaco, and identified the taxonomic status of positive rodents by sequencing a fragment of cytochrome b gene (cytb) and performing blast searches and phylogenetic analyses. a total of 176 sigmodontinae rodents was captured in six surveys using 5425 trap- ... | 2014 | 24394448 |
| trypanosoma cruzi tci and tcii transmission among wild carnivores, small mammals and dogs in a conservation unit and surrounding areas, brazil. | aiming to better understand the ecological aspects of trypanosoma cruzi transmission cycles, wild carnivores, small mammals and dogs were examined for t. cruzi infection in the serra da canastra national park region, brazil. isolates were genotyped using mini-exon gene and pcr-rflp (1f8 and h3) genomic targets. trypanosoma cruzi transmission was well established in the area and occurred in both wild and peridomestic environments. dog seroprevalence was 29·4% (63/214) and tci and tcii genotypes, ... | 2013 | 23062278 |
| clues on syntenic relationship among some species of oryzomyini and akodontini tribes (rodentia: sigmodontinae). | sigmodontinae rodents represent one of the most diverse and complex components of the mammalian fauna of south america. among them most species belongs to oryzomyini and akodontini tribes. the highly specific diversification observed in both tribes is characterized by diploid complements, which vary from 2n = 10 to 86. given this diversity, a consistent hypothesis about the origin and evolution of chromosomes depends on the correct establishment of synteny analyzed in a suitable phylogenetic fra ... | 2015 | 26642204 |
| multivariate discrimination among cryptic mites of the genus androlaelaps (acari: mesostigmata: laelapidae) parasitic of sympatric akodontine rodents (cricetidae: sigmodontinae) in northeastern argentina: possible evidence of host switch followed by speciation, with the description of two new species. | laelapids are among the most common ectoparasites of rodents. currently, it is under discussion whether there is a single polixenous species that parasites a variety of hosts, or whether there are cryptic species highly host specific. herein, multivariate morphometric analyses of cryptic sympatric laelapids of the genus androlaelaps allowed us to identify different species. these species are specific of their akodontine hosts, akodon montensis and thaptomys nigrita, in localities situated in nor ... | 2014 | 25039004 |
| variation in the helminth community structure of three sympatric sigmodontine rodents from the coastal atlantic forest of rio de janeiro, brazil. | one hundred and eighty specimens of sigmodontine rodents living in sympatric conditions were collected in the atlantic forest in the state of rio de janeiro, brazil (25 akodon cursor, 98 akodon montensis and 57 oligoryzomys nigripes) to examine whether the helminth structure and component communities can be characterized among these three closely related rodents. the parasite species richness was 9 in a. cursor, 12 in a. montensis and 12 in o. nigripes. five species were common to the three rode ... | 2011 | 20701831 |
| 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 |
| chromosomal variation in argentine populations of akodon montensis thomas, 1913 (rodentia, cricetidae, sigmodontinae). | the genus akodon meyen, 1833 is one of the most species-rich among sigmodontine rodents and has great chromosome variability. akodon montensis has a relatively broad distribution in south america, and argentine populations are located in the southernmost region of its range. brazilian populations have important chromosomal variability, but cytogenetic data from argentina are scarce. we performed a chromosome characterization of natural populations of akodon montensis using conventional staining, ... | 2016 | 27186343 |
| differences in physiological traits associated with water balance among rodents, and their relationship to tolerance of habitat fragmentation. | physiological concepts and tools can help us to understand why organisms and populations respond to habitat fragmentation in the way they do, and allow us to determine the mechanisms or individual characteristics underlying this differential sensitivity. here, we examine food intake, relative medullary thickness and distribution/expression of water channel aquaporin-1 in three species of south american rodents that have been reported to have different levels of tolerance to habitat fragmentation ... | 2015 | 26349625 |
| amblyomma yucumense n. sp. (acari: ixodidae), a parasite of wild mammals in southern brazil. | during 2013-2014, adult ticks were collected on the vegetation and subadult ticks were collected from small mammals [didelphis aurita wied-neuwied, sooretamys angouya (fischer), euryoryzomys russatus (wagner), akodon montensis thomas, oxymycterus judex thomas] in an atlantic rainforest reserve in southern brazil. analyses of the external morphology of the adult ticks revealed that they represent a new species, amblyomma yucumense n. sp. partial 16s rrna sequences generated from males, females, a ... | 2015 | 26336277 |
| high paracellular nutrient absorption in intact bats is associated with high paracellular permeability in perfused intestinal segments. | water-soluble nutrients are absorbed by the small intestine via transcellular and paracellular mechanisms. based on a few previous studies, the capacity for paracellular nutrient absorption seems greater in flying mammals than in nonflying mammals, but there has been little investigation of the mechanisms driving this difference. therefore, we studied three species each of bats (artibeus lituratus, sturnira lilium and carollia perspicillata) and nonflying mammals (akodon montensis, mus musculus ... | 2014 | 25104759 |
| 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 |
| new karyologycal data and cytotaxonomic considerations on small mammals from santa virgínia (parque estadual da serra do mar, atlantic forest, brazil). | atlantic forest, in the eastern coast of brazil, is a hotspot of biodiversity of mammals, and parque estadual da serra do mar (pesm) is the largest continuous area of this biome. here, we characterized the karyotype composition of the small mammals from santa virgínia, a region in the northern part of pesm. specimens were collected from july 2008 to september 2009. we identified 17 species (13 rodents and 4 marsupials) from which 7 exhibited species-specific karyotypes, illustrating the importan ... | 2014 | 24744831 |
| noteworthy records of ixodes schulzei (acari: ixodidae) on rodents from the state of parana, southern brazil. | ixodes schulzei aragão & fonseca is an endemic tick to brazil and has already been reported in the northern (state of rondonia), southeastern (states of minas gerais, rio de janeiro and sao paulo) and southern (state of santa catarina) regions, always found in association with the water rat nectomys squamipes (brandt). this communication records the first occurrence of this tick species in the state of parana, southern region of brazil, and it constitutes its first report on akodon montensis (th ... | 2013 | 24252964 |
| additional data on the synlophe of stilestrongylus aculeata (travassos, 1918) and stilestrongylus eta (travassos, 1937) (heligmonellidae) parasitic in akodon montensis (sigmodontinae) from the atlantic forest. | additional data on the synlophe and morphological measurements are provided for the heligmonellids stilestrongylus aculeata (travassos, 1918) and stilestrongylus eta (travassos, 1937), collected from akodon montensis thomas, 1913, of the atlantic forest, rio de janeiro, brazil. the synlophe of s. aculeata is characterized by 19 cuticular middle body ridges in males and 24 cuticular middle body ridges in females, whereas s. eta presents 17 middle body ridges in males and 20 middle body ridges in ... | 2014 | 24224841 |
| microhabitat of small mammals at ground and understorey levels in a deciduous, southern atlantic forest. | each animal species selects specific microhabitats for protection, foraging, or micro-climate. to understand the distribution patterns of small mammals on the ground and in the understorey, we investigated the use of microhabitats by small mammals in a deciduous forest of southern brazil. ten trap stations with seven capture points were used to sample the following microhabitats: liana, fallen log, ground litter, terrestrial ferns, simple-trunk tree, forked tree, and piper sp. shrubs. seven fiel ... | 2013 | 23828340 |
| fur mites of the family listrophoridae (acariformes: sarcoptoidea) associated with south american sigmodontine rodents (cricetidae: sigmodontinae). | six species of 3 genera belonging to the fur mite family listrophoridae were recorded on skins of south american rodents of the cricetid subfamily sigmodontinae housed in the bavarian state collection of zoology (munich, germany). among them, amlistrophorus geoxus sp. nov. from geoxus valdivianus from chile is described as a new for science, and males of prolistrophorus amazonicus amazonicus fain, 1971 are recorded for the first time. the full generic status for the subgenus amlistrophorus of th ... | 2012 | 23129199 |
| differences in richness and composition of gastrointestinal parasites of small rodents (cricetidae, rodentia) in a continental and insular area of the atlantic forest in santa catarina state, brazil. | the first and only study on gastrointestinal parasites of wild rodents in the island of santa catarina was done in 1987. the aim of this study was to identify intestinal parasites from wild rodents in santo amaro da imperatriz and santa catariana island, and to compare the richness and composition of the gastrointestinal parasite community of both areas. rodents were captured with live traps, and feces were screened using the sedimentation method and optical microscopy. the following species of ... | 2012 | 22990827 |
| a small mammal community in a forest fragment, vegetation corridor and coffee matrix system in the brazilian atlantic forest. | the objective of our work was to verify the value of the vegetation corridor in the conservation of small mammals in fragmented tropical landscapes, using a model system in the southeastern minas gerais. we evaluated and compared the composition and structure of small mammals in a vegetation corridor, forest fragments and a coffee matrix. a total of 15 species were recorded, and the highest species richness was observed in the vegetation corridor (13 species), followed by the forest fragments (1 ... | 2011 | 21912591 |
| a new species of androlaelaps berlese, 1903 (acari: parasitiformes) parasitising an akodontine rodent (cricetidae: sigmodontinae) in northeastern argentina. | androlaelaps misionalis, a new species of laelapine mite, is described on the basis of specimens collected from the pelage of the akodontine rodent akodon montensis thomas at salto el paraíso, misiones province, in northeastern argentina. the formal taxonomic description, illustrations and sem photographs are derived from female specimens; the male and nymph are unknown. androlaelaps misionalis n. sp. resembles a. maurii lareschi & gettinger, 2009 in general appearance, and both species are clos ... | 2010 | 20532851 |
| environmental genotoxicity evaluation using cytogenetic end points in wild rodents. | we analyzed cytogenetic end points in three populations of two species of wild rodents--akodon montensis and oryzomys nigripes--living in an industrial, an agricultural, and a preservation area at the itajaí valley, state of santa catarina, brazil. our purpose was to evaluate the performance of the following end points in the establishment of a genotoxic profile of each area: the polychromatic/normochromatic cell ratio; the mitotic index; the frequency of micronucleated cells both in the bone ma ... | 2000 | 11133397 |
| evolutionary conservation of whole homeologous chromosome arms in the akodont rodents bolomys and akodon (muridae, sigmodontinae): maintenance of interstitial telomeric segments (itbs) in recent event of centric fusion. | we have identified the almost complete correspondence of whole chromosome arms between the karyotypes of bolomys lasiurus (2n = 33, 34) and akodon montensis (2n = 24, 25) using comparative analysis of the gtg-banding patterns. to explain the karyotypic differentiation of the species, tandem and centric fusions, pericentric inversions, loss of telomeres and centromeres are required. localization of telomere sequences using an (ttaggg)n oligomere as a fluorescence in situ hybridization probe provi ... | 1998 | 10099878 |
| description of the helminth communities of sympatric rodents (muroidea: cricetidae) from the atlantic forest in northeastern argentina. | taxonomic and ecological aspects of the helminths found in the assemblage of sigmodontine rodents (cricetidae-muroidea) of the atlantic forest in argentina are studied in this paper. the following species akodon montensis, brucepattersonius sp. and thaptomys nigrita (tribe akodontini), as well as, euryoryzomys russatus, nectomys squamipes, oligoryzomys nigripes, and sooretamys angouya (tribe oryzomyini) are analyzed. a complete taxonomic list with a total of 25 species of helminths, including di ... | 2017 | 29242441 |
| a new species of eimeria schneider, 1875 from the serra dos órgãos national park, rio de janeiro, brazil, with notes on its endogenous development in the montane grass mouse, akodon montensis thomas, 1913 (rodentia: sigmodontinae). | a total of 53 specimens of the montane grass mouse, akodon montensis thomas, 1913 were collected in the serra dos órgãos national park (sonp) in november 2014 and july 2015. the fecal material was analyzed, and a prevalence of 7.5% was recorded for a new coccidian species of the genus eimeria schneider, 1875, with part of its endogenous development recorded in the small intestine. the oocysts of a new coccidian species of genus eimeria are ellipsoidal to subspherical. the wall is bi-layered, c. ... | 2018 | 29230581 |
| litomosoides silvai (nematoda: onchocercidae) parasitizing akodon montensis (rodentia: cricetidae) in the southern region of brazil. | in the present study, litomosoides silvai parasitizing akodon montensis in the southern region of brazil is reported for the first time. new morphological information is provided for some structures of this nematode species, such as a flattened cephalic extremity, presence of two dorsal cephalic papillae, female tail with a constriction at its tip, "s" shaped vagina, spicules characteristic of the carinii species group and microfilaria tail constricted at the tip. this nematode was found parasit ... | 2017 | 29069160 |
| helminth metacommunity structure of wild rodents in a preserved area of the atlantic forest, southeast brazil. | the helminth fauna and metacommunity structure of eight sympatric sigmodontine rodents were investigated at the serra dos órgãos national park, an atlantic forest reserve located in the state of rio de janeiro, southeast brazil. rodents of the species abrawayaomys ruschii, akodon montensis, blarinomys breviceps , delomys dorsalis, oligoryzomys flavescens, oligoryzomys nigripes, oxymycterus quaestor and thaptomys nigrita were found infected with helminths. akodon montensis presented the highest t ... | 2019 | 30427522 |
| a novel hepacivirus in wild rodents from south america. | the hepacivirus genus comprises single-stranded positive-sense rna viruses within the family flaviviridae. several hepaciviruses have been identified in different mammals, including multiple rodent species in africa, asia, europe, and north america. to date, no rodent hepacivirus has been identified in the south american continent. here, we describe an unknown hepacivirus discovered during a metagenomic screen in akodon montensis, calomys tener, oligoryzomys nigripes, necromys lasiurus, and mus ... | 2019 | 30909631 |
| sigmodontine community and species responses to el niño and precipitation in different levels of forest degradation. | few studies have focused on rodent communities at the margins of an ecoregion or the limits of species' distributions, where the community may be more sensitive to extrinsic variables, both biotic and abiotic. this study evaluates sigmodontine rodent species diversity and overall abundance, and variation associated with climatic variables, in three locations with differing levels of habitat degradation. the study was conducted in northeastern paraguay, near the western limit of the upper paraná ... | 2019 | 32905550 |
| habitat, species richness and hantaviruses of sigmodontine rodents within the interior atlantic forest, paraguay. | four of the nine sigmodontine tribes have species that serve as reservoirs of rodent-borne hantaviruses (rbo-hv), few have been studied in any depth. several viruses have been associated with human cases of hantavirus pulmonary syndrome often through peridomestic exposure. jabora (jabv) and juquitiba (juqv), harbored by akodon montensis and oligoryzomys nigripes, respectively, are endemic and sympatric in the reserva natural de bosque mbaracayú (rnbm), paraguay, a protected area of the interior ... | 2018 | 30067840 |
| ticks parasitizing wild mammals in atlantic forest areas in the state of rio de janeiro, brazil. | mammals captured in the serra dos órgãos national park (parnaso) and the pedra branca state park (pbsp) between 2012 and 2015 were examined for the presence of ticks. in total, 140 mammals were examined, and 34 specimens were found to be parasitized by ticks. didelphis aurita, akodon montensis and oligoryzomys nigripes were the species most parasitized. from these specimens, 146 ticks were collected, including 10 larvae. the ticks belonged to eight species: one in the genus ixodes and seven in t ... | 2019 | 29846459 |
| patterns of arboreal and terrestrial space use by non-volant small mammals in an araucaria forest of southern brazil. | despite the advances in the techniques for researching arboreal small mammals, detailed ecological data, such as habitat use patterns, are practically nonexistent for many species. using 150 live-traps installed on the ground, understory (1.0-5.0m) and canopy (>5.0m) we investigated patterns of arboreal and terrestrial space use by small mammals in an araucaria forest in southern brazil (29°29'08″s; 50°12'26″w). we also measured 19 microhabitat variables that could potentially influence the abun ... | 2014 | 30514009 |
| three new species of eimeria schneider 1875 in the montane grass mouse, akodon montensis (rodentia: cricetidae: sigmodontinae), and redescription of eimeria zygodontomyis lainson and shaw 1990 from southeastern brazil. | we describe three new coccidian species of the genus eimeria schneider 1875 (apicomplexa: eimeriidae) and redescribe and report eimeria zygodontomyis lainson and shaw, 1990 in the montane grass mouse, akodon montensis thomas, 1913 from the serra dos órgãos national park in southeastern brazil. sporulated oocysts of eimeria zygodontomyis are ellipsoidal to cylindrical with a 0.6 (0.5-0.8) μm thick very delicate bi-layered wall; length × width (n = 49) 18.3 × 12.5 (16-20 × 11-13) μm; length/width ... | 2020 | 31820167 |
| hepatozoon milleri sp. nov. (adeleorina: hepatozoidae) in akodon montensis (rodentia: cricetidae: sigmodontinae) from southeastern brazil. | members of the genus hepatozoon (miller, 1908) are blood parasites found in a wide range of host species, including wild rodents; however, information about the life cycle, distribution and hepatozoon species diversity infecting these mammals are lacking. we studied the parasite stages and dna sequences of hepatozoon sp. of 11 naturally infected akodon montensis. thin blood smears, tissue samples and whole blood were obtained for morphology, morphometry and molecular analyses. seven of the 11 ro ... | 2019 | 30486906 |
| a novel polyomavirus in sigmodontine rodents from são paulo state, brazil. | the nearly complete genome sequence of a novel polyomavirus from blood samples of akodon montensis and calomys tener collected in brazil was determined by high-throughput sequencing. this virus showed a typical polyomaviruses genome organization, and it was classified as a member of the genus betapolyomavirus. our results expand the host range and viral diversity of the family polyomaviridae. | 2018 | 29931397 |
| b chromosome diversity and repetitive sequence distribution in an isolated population of akodon montensis (rodentia, sigmodontinae). | b chromosomes are supernumerary chromosomes found in the karyotypes of approximately 15% of all eukaryotic species. they present parasitic behavior and do not follow the standard mendelian pattern of inheritance, resulting in an imbalance in gametogenesis. the evolutionary dynamics of b chromosomes is still unknown for many species, but studies indicate that the accumulation of repetitive sequences plays an important role in the differentiation of these elements. we analyzed morphology, frequenc ... | 2018 | 29544219 |