| (t2ag3)n telomeric sequence hybridization suggestive of centric fusion in karyotype marsupials evolution. | it has been suggested that the karyotype of the marsupials derived from a low diploid number (2n = 14) which originated, through fissions of biarmed chromosomes, the karyotypes with a higher 2n. the telomeric sequence (t2ag3)n was in situ hybridized to the chromosomes of gracilinanus microtarsus and g. emiliae, micoureus demerarae and marmosa murina, species with 2n = 14, in monodelphis sp., m. domestica, m. kunsi and m. brevicaudata with 2n = 18, and in lutreolina crassicaudata, didelphis albiv ... | 2000 | 11294606 |
| karyotype composition of some rodents and marsupials from chapada diamantina (bahia, brasil). | the chapada diamantina (cd) is located in bahia state, between 11-14 degrees s and 41-43 degrees w, being part of the serra do espinhaço. the occurrence of different habitats and transition areas permits an interesting mammal fauna composition, with species from different biomes living in sympatry. species of didelphimorphia and rodentia are important members of mammal communities in almost all different habitats, and morphological and cytogenetic characters are important for a correct identific ... | 2007 | 18094834 |
| selection, diversity and evolutionary patterns of the mhc class ii dab in free-ranging neotropical marsupials. | research on the genetic architecture and diversity of the mhc has focused mainly on eutherian mammals, birds and fish. so far, studies on model marsupials used in laboratory investigations indicated very little or even no variation in mhc class ii genes. however, natural levels of diversity and selection are unknown in marsupials as studies on wild populations are virtually absent. we used two endemic south american mouse opossums, gracilinanus microtarsus and marmosops incanus, to investigate c ... | 2008 | 18534008 |
| permanent genetic resources added to molecular ecology resources database 1 may 2009-31 july 2009. | this article documents the addition of 512 microsatellite marker loci and nine pairs of single nucleotide polymorphism (snp) sequencing primers to the molecular ecology resources database. loci were developed for the following species: alcippe morrisonia morrisonia, bashania fangiana, bashania fargesii, chaetodon vagabundus, colletes floralis, coluber constrictor flaviventris, coptotermes gestroi, crotophaga major, cyprinella lutrensis, danaus plexippus, fagus grandifolia, falco tinnunculus, fle ... | 2009 | 21564933 |
| 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 |
| 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 |
| first evidence of gregarious denning in opossums (didelphimorphia, didelphidae), with notes on their social behaviour. | the didelphidae are considered solitary opossums with few social interactions, usually limited to mating-related or mother-pouch young interactions. anecdotal reports suggest that additional interactions occur, including den sharing by a few individuals, usually siblings. here, we report novel observations that indicate opossums are more social than previously thought. these include nest sharing by males and females of marmosa paraguayana, gracilinanus microtarsus and marmosops incanus prior to ... | 2015 | 26085500 |
| increased susceptibility of gracilinanus microtarsus liver mitochondria to ca²⁺-induced permeability transition is associated with a more oxidized state of nad(p). | in addition to be the cell's powerhouse, mitochondria also contain a cell death machinery that includes highly regulated processes such as the membrane permeability transition pore (ptp) and reactive oxygen species (ros) production. in this context, the results presented here provide evidence that liver mitochondria isolated from gracilinanus microtarsus, a small and short life span (one year) marsupial, when compared to mice, are much more susceptible to ptp opening in association with a poor n ... | 2015 | 26583063 |
| biogeographic determinants of genetic diversification in the mouse opossum gracilinanus agilis (didelphimorphia: didelphidae). | the genetic variation of brazilian populations of the mouse opossum gracilinanus agilis was analyzed on the basis of the mitochondrial cytochrome b gene (mt-cytb) and the exon 28 of the nuclear von willenbrand factor (e28-vwf). the radiation of gracilinanus was dated at 4.80 ma, with the appearance of g. agilis around 1.93 ma. gracilinanus aceramarcae appeared as the first offshoot of the genus, followed by gracilinanus emiliae and gracilinanus microtarsus, which composed a sister clade of g. ag ... | 2013 | 23861549 |
| survey of anti-toxoplasma gondii antibodies in wild mammals captured from atlantic forest fragments in bahia, northeastern brazil. | the objective of this study was to investigate the frequency of antibodies to toxoplasma gondii present in wild mammals that were trap captured in forest fragments in the state of bahia, northeastern brazil. a total of 368 individuals (246 rodents, 104 marsupials and 18 bats) were captured using live catch traps. serum samples were tested using the modified agglutination test, with a cut-off point at 1:25 dilution. the total occurrence of antibodies to t. gondii was 10.6% (39/368), being 16.3% ( ... | 2020 | 33111842 |
| 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 |