Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| allozymic characterization and evolutionary relationships in the brazilian akodon cursor species group (rodentia-cricetidae). | the present study involved an electrophoretic survey of 22 protein loci in 269 individuals belonging to three species of the genus akodon, a. aff. cursor (2n = 16), a. cursor (2n = 14/15), and a. montensis (2n = 24/25/26), collected in eastern brazil. the joint results of gene diversity, genetic distances, phenetic analyses, and phylogenetic trees suggested that a. aff. cursor has recently separated from a. cursor and that the three species have experienced a recent chromosomal divergence follow ... | 1995 | 8748454 |
| emended description of litomosoides silvai (nematoda:filarioidea) of akodon cursor (rodentia:muridae). | the emendation of the description of litomosoides silvai padilha and faria, 1977 was based on results obtained by light and scanning electron microscopy. the filarioids were obtained from akodon cursor (syn. akodon arviculoides) found at the catimbau grande site in rio bonito, brazil. some features that are added to the original description include the en face view of the cephalic end, the width of the buccal capsule, the nerve ring, and the pattern of cuticular striations for both sexes. also i ... | 1996 | 8973410 |
| litomosoides chagasfilhoi sp. nov. (nematoda:filarioidea) parasitizing the abdominal cavity of akodon cursor (winge, 1887) (rodentia:muridae) from brazil. | litomosoides chagasfilhoi sp. nov., a parasite of the abdominal cavity of the wild rodent akodon cursor (winge. 1887), is described herein according to investigations conducted by light and scanning electron microscopy. the leading morphological characteristics of the new species are as follows: the buccal capsule is higher than it is wide and has walls thinner than the lumen, and the left spicule presents a handle longer than the blade, whose edges from large membranous wings folded longitudina ... | 1997 | 9039695 |
| telomeric sequences localization and g-banding patterns in the identification of a polymorphic chromosomal rearrangement in the rodent akodon cursor (2n=14,15 and 16). | akodon cursor is an exceptional example of high chromosomal variability, displaying diploid numbers from 14 to 16 and fundamental numbers (fn) from 18 to 26 as the result of a complex rearrangement in par 1 and pericentric inversions in three autosomal pairs. the difference in the diploid number is due to the presence of a large metacentric pair 1 in the 2n=14 karyotype, a large metacentric 1 and two different submetacentrics (1a and 1b) in 2n=15 and 1a and 1b submetacentric pairs in homozygosis ... | 1997 | 9244449 |
| prevalence of two species of litomosoides (nematoda: filarioidea) parasites of akodon cursor (rodentia: muridae) from southeastern brazil. | two species of filariids, litomosoides silvai and litomosoides chagasfilhoi, were collected from the thoracic and abdominal cavities, respectively, of akodon cursor, from catimbau grande, rio bonito, rio de janeiro, brazil. fifty-eight rodents were necropsied and 15 (25.9%) were parasitized. four of the 15 infected rodents (26.7%) presented concurrent infections, but each species had separate and specific sites of infection. this is the first report of a rodent species parasitized with naturally ... | 1997 | 9440357 |
| zoo-fish of a microdissection dna library and g-banding patterns reveal the homeology between the brazilian rodents akodon cursor and a. montensis. | the neotropical rodents akodon cursor (2n = 14, 15, and 16) and a. montensis (2n = 24 and 25), two closely related and morphologically indistinguishable species, have been compared by g-banding and chromosome painting. in situ hybridization of a biotinylated dop-pcr product obtained from a microdissected chromosome of a. cursor onto a. montensis chromosomes was performed in combination with localization of telomeric sequences using a (ttaggg)n oligomer as a fish probe. the results provide eviden ... | 1997 | 9465893 |
| extraordinary chromosomal polymorphism with 28 different karyotypes in the neotropical species akodon cursor (muridae, sigmodontinae), one of the smallest diploid number in rodents (2n = 16, 15 and 14). | all available published cytogenetic data show the presence of 28 different karyotypes in 311 specimens of a. cursor as an exceptional example of high karyotype variability in a single species. our present sample of 116 animals collected in the rain forest of the atlantic coast of the states of são paulo and bahia, brazil, show 25 karyotype constitutions. the diploid number (2n) ranged from 16 to 14, and the number of autosomal arms (nf) from 26 to 18, because of centric fusion and pericentric in ... | 1998 | 10319722 |
| induction and characterization of hypoxanthine-phosphoribosyltransferase (hprt-) deficient cell lines of akodon cursor (rodentia, sigmodontinae). | hypoxanthine-phosphoribosyltransferase negative (hprt-) cell lines derived from an akodon cursor liposarcoma were obtained by induced mutagenesis. all but one hprt- cell line lacked hprt mrna transcripts while one (ako 3) coded for a truncated protein. cell fusion and karyotypic analyses showed that one cell line (ako 1-15) could be successfully used for constructing hybrid panels and allow for a clear identification of human chromosomes in hybrid cells. | 2001 | 11306816 |
| small rodents fleas from the bubonic plague focus located in the serra dos orgãos mountain range, state of rio de janeiro, brazil. | eleven species of fleas were collected from 601 small rodents, from november 1995 to october 1997, in areas of natural focus of bubonic plague, including the municipalities of nova friburgo, sumidouro and teresópolis, state of rio de janeiro, brazil. among 924 fleas collected, polygenis (polygenis) rimatus (rhopalopsyllidae) was the predominant species regarding the frequency, representing 41.3% (n:382), followed by p. (neopolygenis) pradoi, representing 20% (n:185) and craneopsylla minerva mine ... | 2001 | 11500756 |
| inheritance of litter size at birth in the brazilian grass mouse (akodon cursor, sigmodontinae, rodentia). | by means of complex segregation analysis we studied the inheritance of litter size in two large pedigrees of captive-bred colonies of the brazilian grass mouse akodon cursor. genetic analysis has revealed a highly significant influence of genetic factors on the variation of litter size (heritability, h2, was estimated as 0.44). the inheritance followed the classical polygene model: neither the major-gene model nor the polygene with unequal contribution model described the data significantly bett ... | 2002 | 12448858 |
| nectomys squamipes microsatellites and homologous loci in sigmodontine rodents. | three monomorphic and four highly polymorphic microsatellites of nectomys squamipes were isolated and characterised in a sample of 141 specimens from eight different brazilian localities. these seven microsatellites and four others previously described in this species were tested in seven other nonfocus sigmodontine species. at least three loci were successfully amplified in every species, but none was amplified in all species. all sequenced products in nonfocus species showed (gt)(n) motifs as ... | 2003 | 12721229 |
| enzootic transmission of trypanosoma cruzi and t. rangeli in the federal district of brazil. | the federal district of brazil (df) lies within the cerrado biome, where open shrubland (savannas) is interspersed with riverside gallery forests and permanent swamps (veredas). trypanosoma cruzi-infected native triatomines occur in the area, but the enzootic transmission of trypanosomatids remains poorly characterized. a parasitological survey involving sylvatic triatomines (166 rhodnius neglectus collected from mauritia flexuosa palms) and small mammals (98 marsupials and 70 rodents, totaling ... | 2004 | 15654478 |
| fine structure and cytochemical analysis of the intestinal wall along the body of adult female of litomosoides chagasfilhoi (nematoda: filarioidea). | litomosoides chagasfilhoi is a filariid nematode parasite of the abdominal cavity of the wild rodent akodon cursor (winge, 1887), that has been described and used in brazil as a new model for human filariasis. the fine structure of the intestine of this nematode was analyzed based on observations made by light and transmission electron microscopies of serial sections along the body. cytochemical analysis was carried out to investigate the composition of the intestinal wall. this structure consis ... | 2006 | 16416290 |
| 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 |
| chromosomal phylogeny of four akodontini species (rodentia, cricetidae) from southern brazil established by zoo-fish using mus musculus (muridae) painting probes. | we established chromosome homology maps between mus musculus (mmu) and five species of the akodontini tribe, akodon cursor (2n = 14, 15 and 16), a. montensis (2n = 24), a. paranaensis (2n = 44), a. serrensis (2n = 46) and oligoryzomys flavescens (2n = 66) by zoo-fish (fluorescence in situ hybridization) using mouse chromosome-specific probes. the aims of this study were (1) to detect the chromosomal rearrangements responsible for the karyotype variation in this tribe and (2) to reconstruct the p ... | 2008 | 18293106 |
| 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 |
| 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 |
| 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 |
| testing the rio doce as a riverine barrier in shaping the atlantic rainforest population divergence in the rodent akodon cursor. | akodon cursor occurs in dense rainforest from northern (8° s) to southern (26° s) states along the atlantic coast of brazil. previous karyological and molecular data revealed two major clades, one including northern (8-15° s) and the other southern (19-26° s) populations. the center of geographic distribution (15-20° s), which included the state of espírito santo, was identified as a potential vicariance region. since river barriers are among the most discussed models in the study of neotropical ... | 2010 | 21637592 |
| Detection of two morphologically cryptic species from the cursor complex (Akodon spp; Rodentia, Cricetidae) through the use of RAPD markers. | The cursor complex is a group within the Akodon genus of South American rodents, formed by Akodon cursor and A. montensis. Correct distinction between these two species is of great importance since they can harbor different Hantavirus strains. These species are only distinguishable by means of karyotypic or internal anatomic features, requiring dissection; recently, some other genetic methods have become available. We developed RAPD markers capable of distinguishing between A. cursor and A ... | 2011 | 22179960 |
| phylogeographic structure and karyotypic diversity of the brazilian shrew mouse ( blarinomys breviceps, sigmodontinae) in the atlantic forest. | blarinomys breviceps possesses cryptic and burrowing habits with poorly documented genetics and life history traits. due to its rarity, only a few specimens and dna sequences have been deposited in collections worldwide. here, we present the most comprehensive cytogenetic and molecular characterization of this rare genus. phylogenetic analyses based on partial cytochrome b sequences were performed, attempting to establish the relationships among individuals with distinct karyotypes along the geo ... | 2012 | 22907314 |
| helminth communities in three sympatric rodents from the brazilian atlantic forest: contrasting biomass and numerical abundance. | the study of parasite body size is an important approach to understand the different patterns of helminth community structure, once it is usually analysed using only numerical descriptors which do not capture size heterogeneity among parasite species. in the present study, we compared the pattern in the helminth community of three sympatric wild rodent species akodon cursor, a. montensis and oligoryzomys nigripes using numerical abundance and biomass approaches. the cestode rodentolepis akodonti ... | 2012 | 23295521 |
| 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 |
| niche suitability affects development: skull asymmetry increases in less suitable areas. | for conservation purposes, it is important to take into account the suitability of a species to particular habitats; this information may predict the long-term survival of a species. in this sense, morphological measures of developmental stress, such as fluctuating asymmetry, can be proxies for an individual's performance in different regions. in this study, we conducted tests to determine whether areas with different levels of suitability for a species (generated by ecological niche models) wer ... | 2015 | 25874364 |
| the influence of habitat fragmentation on helminth communities in rodent populations from a brazilian mountain atlantic forest. | the influence of habitat structure on helminth communities of three sigomdontinae rodent species (akodon cursor, a. montensis and oligoryzomys nigripes) was investigated in forest fragments within an agricultural landscape in south-eastern brazil. this is a pionner study correlating the occurrence of helminth species of rodent hosts with microhabitat characteristics. rodents were collected from 12 fragments and in a continuous conserved area. up to 13 nematode, three cestode and two trematode sp ... | 2016 | 26206199 |
| 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 |
| new species and records of mites of the superfamily sarcoptoidea (acariformes: psoroptidia) from mammals in brazil. | sixteen species of the superfamily sarcoptoidea (acariformes: psoroptidia) belonging to 10 genera of the families atopomelidae, listrophoridae, chirodiscidae, and listropsoralgidae are recorded in brazil. among them, three species, prolistrophorus hylaeamys sp. nov. from hylaeamys laticeps (lund, 1840) (cricetidae: sigmodontinae) from minas gerais, lynxacarus serrafreirei sp. nov. from galictis cuja (molina, 1782) (carnivora: mustelidae) from rio de janeiro (listrophoridae), and didelphoecius mi ... | 2016 | 26751869 |
| new morphological data of litomosoides chagasfilhoi (nematoda: filarioidea) parasitizing nectomys squamipes in rio de janeiro, brazil. | litomosoides chagasfilhoi, originally described by moraes neto, lanfredi & de souza (1997) parasitizing the abdominal cavity of the wild rodent, akodon cursor (winge, 1887), was found in the abdominal cavity of nectomys squamipes (brants, 1827), from the municipality of rio bonito, rio de janeiro state, brazil. this study led to addition of new morphological data and a new geographical distribution for this filarioid in brazil. several characters were detailed and emended to previous records of ... | 2016 | 27925058 |
| a fatal hantavirus pulmonary syndrome misdiagnosed as dengue: an investigation into the first reported case in rio de janeiro state, brazil. | we report the results of an investigation into a fatal case of hantavirus pulmonary syndrome (hps) in rio de janeiro state, brazil, where the disease had not been reported previous to 2015. following the notification of an hps case, serum samples were collected from the household members and work contacts of the hps patient and tested for antibody to hantaviruses. seroprevalence of 22% (10/45) was indicated for hantavirus out of 45 human samples tested. blood and tissue samples were collected fr ... | 2017 | 28719302 |
| comparative genomic in situ hybridization and the possible role of retroelements in the karyotypic evolution of three akodontini species. | south american akodontini rodents are characterized by a large number of chromosome rearrangements. among them, the genus akodon has been extensively analyzed with classical and molecular cytogenetics, which allowed the identification of a large number of intra- and interspecific chromosomal variation due to robertsonian rearrangements, pericentric inversions, and heterochromatin additions/deletions. in order to shed some light on the cause of these rearrangements, we comparatively analyzed the ... | 2017 | 28900618 |
| leishmania (viannia) braziliensis infection in wild small mammals in ecotourism area of brazil. | leishmaniases are parasitic diseases transmitted to mammalian hosts by sand fly vectors (diptera: psychodidae). despite the increasing occurrence of visceral and cutaneous leishmaniasis cases in urban centers, their transmission still occur primarily in wild environments and may be associated with professional activities and recreation, such as ecotourism. the reserva particular do patrimônio natural santuário do caraça (rppnsc) is one of the largest ecotourism attractions in the state of minas ... | 2017 | 29284049 |
| helminth communities of sigmonontine rodents in cocoa agroforestry systems in brazil. | agroforestry is an alternative kind of land use where the native vegetation is surrounded or intercalated by crops of economic interest. this system may maintain species richness by promoting the habitat heterogeneity or serving as ecological corridors. the aim of this study was to describe the gastrointestinal helminth fauna and to analyse the parasitological parameters of the helminth communities of six sigmodontine rodents in a cocoa agroforestry system in the municipality of ilhéus, state of ... | 2020 | 32274328 |
| investigation of bartonella spp. in brazilian mammals with emphasis on rodents and bats from the atlantic forest. | the bartonella species are zoonotic agents that infect mammals and are transmitted by arthropod vectors. approximately 18 distinct genotypes cause diseases in humans, and may be spread by both domestic and wild animals. in brazil, bartonella genotypes have been identified in several species of wild mammals, and in the present study, we analyzed samples from non-human primates (marmosets), marsupials, rodents, and bats, and compared them with the genotypes described in mammals from brazil, to exa ... | 2020 | 32904298 |