| pterygodermatites (paucipectines) jägerskiöldi (nematoda: rictulariidae) from gracilinanus agilis and g. microtarsus (marsupialia: didelphidae) in brazilian pantanal and atlantic forest by light and scanning electron microscopy. | pterygodermatites (paucipectines) jägerskiöldi lent and freitas, 1935, a parasitic nematode of the small intestine of the marsupial gracilinanus agilis (mammalia: didelphidae) from the pantanal of mato grosso do sul state, and g. microtarsus from atlantic forest of rio de janeiro state, brazil, were analyzed by light and scanning electron microscopy. details of the surface topography such as the oral aperture, cephalic papillae, 2 papillae in posterior end, and longitudinal cuticular elements re ... | 2007 | 17539409 |
| 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 |
| barn owl (tyto alba) predation on small mammals and its role in the control of hantavirus natural reservoirs in a periurban area in southeastern brazil. | the aim of this study was to inventory the species of small mammals in uberlândia, minas gerais, brazil, based on regurgitated pellets of the barn owl and to compare the frequency of rodent species in the diet and in the environment. since in the region there is a high incidence of hantavirus infection, we also evaluate the importance of the barn owl in the control of rodents that transmit the hantavirus. data on richness and relative abundance of rodents in the municipality were provided by the ... | 2008 | 19197490 |
| availability of food resources and habitat structure shape the individual-resource network of a neotropical marsupial. | spatial and temporal variation in networks has been reported in different studies. however, the many effects of habitat structure and food resource availability variation on network structures have remained poorly investigated, especially in individual-based networks. this approach can shed light on individual specialization of resource use and how habitat variations shape trophic interactions.to test hypotheses related to habitat variability on trophic interactions, we investigated seasonal and ... | 2019 | 31015979 |
| the impact of botfly parasitism on the health of the gracile mouse opossum (gracilinanus agilis). | fragmented habitats generally harbour small populations that are potentially more prone to local extinctions caused by biotic factors such as parasites. we evaluated the effects of botflies (cuterebra apicalis) on naturally fragmented populations of the gracile mouse opossum (gracilinanus agilis). we examined how sex, food supplementation experiment, season and daily climatic variables affected body condition and haemoglobin concentration in animals that were parasitized or not by botflies. alth ... | 2019 | 30915931 |
| seasonal changes of faecal cortisol metabolite levels in gracilinanus agilis (didelphimorphia: didelphidae) and its association to life histories variables and parasite loads. | the aim of this study was to evaluate the role of environmental (dry versus wet season) and individual (sex, body mass and reproductive status) factors in the levels of faecal cortisol metabolites (fgcs) in gracilinanus agilis faecal samples as an index of stress levels in this species; as well as its association with abundance of eimeria spp, as an indicator of immunocompetence against parasites. our study found that fgcfgcs are a reliable indicator of adrenal activity in g. agilis. we found th ... | 2018 | 30151195 |
| tick-borne pathogens in dogs, wild small mammals and their ectoparasites in the semi-arid caatinga biome, northeastern brazil. | caatinga is a biome exclusive to the semiarid zone of brazil, where studies on ticks and tick-borne diseases are scarce. herein, we investigated the occurrence of rickettsia, ehrlichia, and coxiella in wild mammals, domestic dogs and their ectoparasites using molecular and serological techniques. during 2014-2016, blood samples and ectoparasites were collected from 70 small mammals (51 rodents, 18 marsupials, 1 wild canid) and 147 domestic dogs in three areas of the caatinga. through serological ... | 2020 | 32111546 |
| composition and characteristics of a diverse didelphid community (mammalia: didelphimorphia) in sub-tropical south america. | few studies have reported didelphid communities of ≥10 species, and all of these have been from within the tropics sensu stricto of south america. herein a community of 12 species of didelphids is described from a sub-tropical site in south-central south america. the reserva natural del bosque mbaracayú, in northeastern paraguay, lies at the western margin of the interior atlantic forest and the southwestern limit of the cerrado, two important south american ecoregions. the rich didelphid commun ... | 2018 | 32905478 |
| eimeria spp. (apicomplexa: eimeriidae) of marsupials (mammalia: didelphimorphia) in southern bahia, brazil. | the occurrence of eimeria schneider, 1875 in mammals of the order didelphimorphia indicates the infection-predisposition of these animals, which in turn is mainly determined for their eating habits. the objective of this work was to evaluate the parasitism of eimeria spp. in marsupials of the atlantic forest of the southern region of bahia. fecal samples were collected from marsupials captured in the regions of ilhéus, una, belmonte and mascote, with traps of the sherman model (23 × 8 × 9 cm), t ... | 2019 | 30427519 |
| 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 |
| trypanosomatids in small mammals of an agroecosystem in central brazil: another piece in the puzzle of parasite transmission in an anthropogenic landscape. | we surveyed infection by trypanosoma spp. and leishmania spp. in small wild mammals from cumari, goiás state aiming to investigate the diversity of trypanosomatid in a modified landscape of the brazilian cerrado (and possible infection overlapping with canids from the same area). blood, skin, spleen, and liver samples were collected for parasitological, serological, and molecular assays. gracilinanusagilis was the most abundant species (n = 70; 48.6%) and it was the only one with patent parasite ... | 2019 | 31615153 |
| a comparative study of lymph node mast cell populations in five marsupial species. | in order to determine whether different subpopulations of mast cells exist, mast cells of mandibular and axillary lymph nodes from five species (didelphis aurita, metachirus nudicaudatus, philander opossum, marmosops incanus and gracilinanus agilis) of south american marsupials were studied. our results showed that mast cells present in the connective tissue of the capsule and septa (ctmc) were similar to those described for eutherian mammals. however, a population of mast cells that was present ... | 1999 | 10481303 |
| molecular detection of hepatozoon spp. in domestic dogs and wild mammals in southern pantanal, brazil with implications in the transmission route. | hepatozoon parasites comprise intracellular apicomplexan parasites transmitted to vertebrate animals by ingestion of arthropods definitive hosts. the present work aimed to investigate the occurrence of hepatozoon spp. in wild animals, domestic dogs and their respective ectoparasites, in southern pantanal region, central-western brazil, by molecular techniques. between august 2013 and march 2015, 31 coatis (nasua nasua), 78 crab-eating foxes (cerdocyon thous), seven ocelots (leopardus pardalis), ... | 2017 | 28291601 |
| expanding the knowledge about leishmania species in wild mammals and dogs in the brazilian savannah. | wild, synanthropic and domestic mammals act as hosts and/or reservoirs of several leishmania spp. studies on possible reservoirs of leishmania in different areas are fundamental to understand host-parasite interactions and develop strategies for the surveillance and control of leishmaniasis. in the present study, we evaluated the leishmania spp. occurrence in mammals in two conservation units and their surroundings in brasília, federal district (fd), brazil. | 2015 | 25889365 |
| spirurids from gracilinanus agilis (marsupialia: didelphidae) in brazilian pantanal wetlands with a new species of physaloptera (nematoda: spirurida). | gastrointestinal nematodes were recovered from thirty four gracilinanus agilis from forty four collected in pantanal, mato grosso do sul state, brazil. two hundred seventy four spirurids were recovered from the esophagus, stomach and intestines, comprising three species from three different genera. these were identified as pterygodermatites (paucipectines) jägerskiöldi, spirura guianensis and physaloptera herthameyerae n. sp. is first described. this is the first record of nematodes of the gener ... | 2009 | 19406578 |
| metabolic, ventilatory, and hygric physiology of the gracile mouse opossum (gracilinanus agilis). | we present the first complete study of basic laboratory-measured physiological variables (metabolism, thermoregulation, evaporative water loss, and ventilation) for a south american marsupial, the gracile mouse opossum (gracilinanus agilis). body temperature (t(b)) was thermolabile below thermoneutrality (t(b) = 33.5 degrees c), but a substantial gradient between t(b) and ambient temperature (t(a)) was sustained even at t(a) = 12 degrees c (t(b) = 30.6 degrees c). basal metabolic rate of 1.00 ml ... | 2009 | 19199558 |
| a new oxyurid genus and species from gracilinanus agilis (marsupialia: didelphidae) in brazil. | a description is provided for gracilioxyuris agilisis n. g., n. sp. found in the cecum of gracilinanus agilis burmeister, 1854 (gardner, 2005) (didelphidae) in brazilian pantanal. the new species can be distinguished from didelphoxyuris thylamisis by a dome-shaped anterior end, a weakly developed cephalic vesicle, males with no postcloacal ornamentation, and operculate eggs with 3 longitudinal ridges. gracilioxyuris n. g. is characterized by a small and apical oral opening and double-crested lat ... | 2008 | 18837574 |
| geographic variation in daily temporal activity patterns of a neotropical marsupial (gracilinanus agilis). | the temporal activity of animals is an outcome of both biotic and abiotic factors, which may vary along the geographic range of the species. therefore, studies conducted with a species in different localities with distinct features could elucidate how animals deal with such factors. in this study, we used live traps equipped with timing devices to investigate the temporal activity patterns of the didelphid gracilinanus agilis in two dry-woodland areas of the brazilian savanna (cerrado). these ar ... | 2017 | 28052077 |
| didelphidae marsupials (mammalia, didelphimorphia) from the late pleistocene deposit of the gruta dos moura cave, northern brazil. | the present study acknowledges the diversity of fossil marsupials from the gruta dos moura cave, as well as environmental and climatic aspects during the quaternary. the results show that this is the largest diversity of pleistocene marsupials recorded in a single cave: didelphis albiventris, d. aurita, gracilinanus agilis, g. microtarsus, marmosa murina, monodelphis brevicaudata, m. domestica and sairadelphys tocantinensis. furthermore, the described specimens are also part of the only fossil a ... | 2015 | 25806985 |
| the araguaia river as an important biogeographical divide for didelphid marsupials in central brazil. | the riverine barrier model suggests that rivers play a significant role in separating widespread organisms into isolated populations. in this study, we used a comparative approach to investigate the phylogeography of 6 didelphid marsupial species in central brazil. specifically, we evaluate the role of the mid-araguaia river in differentiating populations and estimate divergence time among lineages to assess the timing of differentiation of these species, using mitochondrial dna sequence data. t ... | 2015 | 26249652 |
| 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 |
| marmosa paraguayana (marsupialia: didelphidae) as a new host for gracilioxyuris agilisis (nematoda: oxyuridae) in brazil. | didelphids (didelphimorphia: didelphidae) are a large and well-studied group of neotropical marsupials. although knowledge of the parasitic fauna of didelphids is still scarce, recent work has suggested that neotropical marsupials are often hosts of pinworms. here, we isolated oxyurid nematodes from fecal samples of marmosa paraguayana (marsupialia: didelphidae) and provide a general description and measurements for male and female specimens. we concluded these specimens can be assigned to graci ... | 2012 | 21954857 |
| redescription of spirura guianensis (nematoda: spiruridae) from a rare south american gracile opossum. | spirura genus blanchard, 1849 comprise of nematode parasites that infect primate and marsupial species. although several taxonomical studies have shown that the infection by this species occurs primarily in the esophagus of primates, evidence for the occurrence of these parasites in other hosts (marsupials, rodents and bats) has become the subject of investigation by several groups. in this work, we describe the presence of spirura guianensis ortlepp, 1924 in the marsupial gracilinanus agilis (m ... | 2015 | 26187357 |
| reproductive effort and seasonality associated with male-biased parasitism in gracilinanus agilis (didelphimorphia: didelphidae) infected by eimeria spp. (apicomplexa: eimeriidae) in the brazilian cerrado. | the aggregation of parasites among hosts is associated with differential host exposure and susceptibility to parasites, which varies according to host gender, body size, reproductive status and environmental factors. we evaluated the role of these factors on infestation by eimeria spp. (eimeriidae) in the agile gracile mouse opossum (gracilinanus agilis), a semelparous didelphid inhabiting neotropical savannahs. eimeria spp. abundance and prevalence among g. agilis were associated with the breed ... | 2015 | 25877479 |