Consulta: subjectFacets:"Rodents"
Registros recuperados: 39
Data/hora: 07/06/2024 10:23:05

Nine karyomorphs for spiny rats of the genus Proechimys (Echimyidae, Rodentia) from North and Central Brazil
Provedor de dados: 74
Autores: Machado,Taís; Silva,Maria José de J.; Leal-Mesquita,Emygdia Rosa; Carmignotto,Ana Paula; Yonenaga-Yassuda,Yatiyo.
Spiny rats of the genus Proechimys are morphologically diverse, widely distributed and have diploid numbers ranging from 2n = 14-16 to 2n = 62. In this paper we present cytogenetical data and brief comments on morphological and biogeographical issues related to spiny rats. In our sample of 42 spiny rats collected from 12 Brazilian Amazonian tropical rainforest and the Cerrado (Brazilian savanna) sites we detected nine karyological entities: four different karyomorphs with 2n = 30, three with 2n = 28, one with 2n = 15 and one with 2n = 44. Based on qualitative morphological characters these karyomorphs can be allocated to five species within the goeldii, guyannensis and longicaudatus species groups.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proechimys; Rodents; Cytogenetics; Karyomorph; Morphology.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500007

Diversity and habitat preference of medium and large-sized mammals in an urban forest fragment of southwestern Amazon
Provedor de dados: 76
Autores: Borges,Luiz H. M.; Calouro,Armando. M.; Botelho,André L. M.; Silveira,Marcos.
We assessed the species composition and abundance of medium and large-sized mammals in an urban forest fragment in the Brazilian Amazon, and recorded the preference of some species for particular phytophysiognomies. We placed nine transects with 20 sand plots each in three phytophysiognomies: open rainforest with a dominance of bamboos (OFB), open rainforest with palm trees (OFP), and dense rainforest (DF). We calculated species abundance as the number of records/plot.day, in a total of 2,700 plots.day. We recorded twelve mammal species; Sylvilagus brasiliensis (Linnaeus, 1758) and Dasyprocta fuliginosa (Wagler, 1831) were the most abundant. The results differed among phytophysiognomies: DF presented the highest mammal diversity, whereas the species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acre; Sand plot; Rodents; 'tapiti'; Palm tree.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212014000200006

Alguns aspectos sobre roedores domésticos e seu controle em construções rurais.
Provedor de dados: 14
Autores: CAJUEIRO, I. V. de M.
bitstream/item/87587/1/CT04.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Roedor; Rato; Construção rural; Controle biológico; Controle físico; Controle químico; Rodents; Mice; Biological control; Physical control; Chemical control.
Ano: 1989
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/10073

ENVIRONMENTAL ENRICHMENT DURING EARLY POSTNATAL DEVELOPMENT DECREASES PARVALBUMIN EXPRESSION IN THE RAT SOMATOSENSORY CORTEX
Provedor de dados: 77
Autores: Inzunza,Oscar; Bravo,Hermes; Fernández,Víctor.
In the rat brain, parvalbumin (PV) expression starts on postnatal day 8 and comprises a heterogeneous population of nonpyramidal GABAergic neurons. In the present work, an immunohistochemical study was done on control and experimental rats submitted to enriched environmental conditions between postnatal days 3 to 18 or 3 to 24. Counts of PV+ neurons were made in the dorsomedial and in the ventrolateral regions of the somatosensory cortex. In control animals, PV+ neurons reached a peak on day 24 declining towards day 120. In these rats a peculiar distribution pattern was detected in which immunoreactive neurons are more numerous in the dorsomedial than ventrolateral regions as well in infragranular than supragranular layers and in posterior regions than...
Tipo: Journal article
Palavras-chave: Neuropeptide PV; Cerebral cortex; Polysensorial stimulation; Rodents; Immunohistochemistry.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000300001

Efficacy of anticoagulant drugs as rodenticides and genetic variation on Vkorc1 of Mus musculus from Buenos Aires province (Argentina)
Provedor de dados: 46
Autores: Espinosa,M.B.
The relationship between anticoagulant rodenticides and the gene for vitamin K epoxide reductase has been extensively studied The significance of mutations in Vkorc1 on the degree of response to anticoagulants is controversial. The implication of the VKORC1 function in pest control drives the attention to a wide range of factors that may be influencing the resistance to rodenticides, an issue that will be discussed in this article. Anticoagulants are used as rodenticides as well as to improve human health. The interactions between VKORC1 and CYP4F18 (cytochrome P450) are complex. It is likely that the coagulation response may be due to a diverse expression of the Vkorc1 gene and its interaction with the expression of Cyp4f18, and to the polymorphisms...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitamin K epoxide reductase; Rodenticides; Rodents.
Ano: 2013
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332013000100004

Hantaviruses as emergent zoonoses
Provedor de dados: 80
Autores: Ullmann,LS; Souza,LC; Langoni,H.
Hantaviruses belong to the Bunyaviridae family, which consists of vector-borne viruses. These viruses can provoke two infection types: hemorrhagic fever with renal syndrome (HFRS) - which occurs in the Old World - and hantavirus cardiopulmonary syndrome (HCPS) - an emergent zoonosis that can be found in many countries of the western hemisphere. Rodents are hantavirus reservoirs and each species seems to host a different virus type. Humans acquire the infection by inhaling contaminated aerosol particles eliminated by infected animals. The factors involved in the emergence of hantavirus infections in the human population include ecological modifications and changes in human activities. The most important risk factor is contact between man and rodents, as a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hantaviruses; Rodents; Control; Public health.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992008000400002

The agouti Dasyprocta leporina (Rodentia: Dasyproctidae) as seed disperser of the palm Astrocaryum aculeatissimum
Provedor de dados: 81
Autores: Pires,Alexandra S; Galetti,Mauro.
Some large-seeded plants depend heavily on agoutis for seedling recruitment. The importance of Dasyprocta leporina as seed disperser of the Atlantic Forest palm Astrocaryum aculeatissimum was evaluated using camera-traps and seed removal experiments. Agoutis were registered at 67% of the records obtained through the monitoring of mature fruits; palms were visited from 07:00 to 18:45 h. Dispersal distances ranged from 0.5 to 48.7 m (mean ± sd = 6.8 ± 9.1 m) and most of the removed seeds were buried (57.8%). These results corroborate the importance of agoutis for the seed dispersal of Astrocaryum palms.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Activity patterns; Atlantic Forest; Rodents; Seed dispersal; Seed predation.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832012000100013

Arthropods and helminths assemblage in sigmodontine rodents from wetlands of the Río de la Plata, Argentina
Provedor de dados: 81
Autores: Navone,Graciela T.; Notarnicola,Juliana; Nava,Santiago; Robles,M. del Rosario; Galliari,Carlos; Lareschi,Marcela.
The assemblage of arthropods and helminths, present in sigmodontine rodents (Cricetidae) from a broad wetland area of the Río de la Plata, Argentina, was studied. A total of 250 sigmodontines were captured during a two-year sampling period: Scapteromys aquaticus and Oxymycterus rufus were the most abundant hosts, followed by Oligoryzomys nigripes, Akodon azarae, Oligoryzomys flavescens, and Deltamys kempi. There were 33102 parasites collected, corresponding with Rhopalopsyllidae fleas (Siphonaptera), Hoplopleuridae lice (Phtiraptera), Laelapidae and Macronyssidae mites, Ixodidae ticks, and Trombiculidae chiggers (Acari), the trematodes Echinostomidae, Microphallidae, and Dicrocoelidae, the flatworm Ciclophyllidea, the nematods Trichuridae, Spiruridae,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ectoparasites; Endoparasites; Río de La Plata; Rodents; Wetlands.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832009000100011

A comparison of three methods to estimate variations in the relative abundance of moutain vizcachas (Lagidium viscacia) in the High Andes ecosystems
Provedor de dados: 81
Autores: Lucherini,Mauro; Reppucci,Juan I.; Luengos Vidal,Estela.
Mountain vizcachas are large rodents that constitute the main prey of the High Andes meso-carnivores. We compared the line transect pellet count, observation rate and photographic rate methods to estimate the relative abundance of Mountain vizcachas in the High Andes ecosystems. Although a more formal validation based on the comparison with true abundances is desirable, our results suggested that these simple and affordable indices are promising methods, especially if protocols and sampling efforts are carefully standardized. We recommend the use of photographic rates, which are likely to provide the most reliable estimates, especially where Mountain vizcachas are active at night.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Andean cat; Camera trapping; Direct counts; Fecal pellet counts; Rodents.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832009000100020

Cytogenetics and redescription of Graomys (Rodentia, Sigmodontinae) from Chumbicha, Catamarca, Argentina
Provedor de dados: 81
Autores: Lanzone,Cecilia; Novillo,Agustina; Suárez,Natalia S.; Ojeda,Ricardo A.
The taxonomy, phylogenetic relationships and distribution of the genus Graomys are confusing. In this note we report karyotypic data for specimens of Graomys collected in Chumbicha, Catamarca Province, Argentina. Their karyotypes agree with G. centralis with 2n = 42. The individuals from Chumbicha are similar in morphology to G. griseoflavus but smaller. Our results suggest that Chumbicha's specimens are conspecific with G. medius. Moreover, we propose to synonymize G. medius with G. centralis. Other data of the genus suggest that the name G. chacoensis should be applied to specimens with 2n = 42.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Chromosomes; Morphometry; Phyllotine; Rodents; Taxonomy.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832007000200009

Efficiency of four trap types in sampling small mammals in forest fragments, Mato Grosso, Brazil
Provedor de dados: 81
Autores: Santos-Filho,Manoel; da Silva,Dionei J.; Sanaiotti,Tânia M.
We sampled the small mammal community inhabiting semi-deciduous forest fragments in Mato Grosso, Brazil, using 4 different types of traps, Tomahawk, Sherman, snap, and pitfall, in order to evaluate the efficiency of different trap types in sampling efforts. During our study, we captured a total of 984 individuals of 27 species over 33 800 trap/nights. Sherman traps captured a significantly greater abundance of individuals and higher species richness than the other 3 types of traps. The Tomahawk and snap traps exhibited similar capture rates, in both the number of individuals and species captured. Pitfall traps captured the fewest numbers of individuals and species and were the only trap type to have different, although not significant, capture rates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marsupials; Mato Grosso; Rodents; Semi-deciduous forest fragments; Traps.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832006000200005

Small mammal commnities in the Sierra de los cuchumatanes, Huehuetenago, Guatemala
Provedor de dados: 81
Autores: Matson,John O; Ordóñez-Garza,Nicté; Bulmer,Walter; Eckerlin,Ralph P.
Very little is known concerning small mammal ecology and their distribution in the highlands of Guatemala. Small mammals were trapped from five different cloud forests in the Sierra de los Cuchumatanes, Huehuetenango, Guatemala. Cloud forest elevations ranged from 2600 m to 3350 m. Most sites had evidence of human disturbance with only Cerro Bobí having a relatively pristine forest. A total of 13 species was recorded with the species density at sites ranging from six to ten. Accounts of each species are given. The most common species present was Reithrodontomys sumichrasti, except at Cerro Bobí where Peromyscus guatemalensis was most abundant. Differences between years and between seasons (wet versus dry) were minor. Only the site at Cerro Bobí, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cloud forests; Ecology; Mesoamerica; Rodents; Shrews.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832012000100007

The Middle Aragonian (Middle Miocene) Micromammals from La Retama (Intermediate Depression, Tagus Basin) Province of Cuenca, Spain
Provedor de dados: 16
Autores: Álvarez Sierra, M.A.; García Paredes, I.; Hoek Ostende, L.W. van den; Meulen, A.J. van der; Peláez-Campomanes, P.; Sevilla, P.
The micromammal fauna from the Middle Miocene (Middle Aragonian) of La Retama, eastern central Spain, is described. It is a relatively poor rodent fauna composed by ten species only, associated to a highly diverse bat fauna, which includes five genera. The insectivores are represented by two species. This fossil assemblage has been correlated to zone Db (MN 5). The palaeoenvironmental reconstruction based on micromammals indicates open and dry conditions for this locality.    Se describen los micromamíferos del Mioceno medio (Aragoniense medio) de La Retama, sector centro-oriental español. La fauna de roedores es relativamente pobre y está compuesta únicamente por diez especies. Sin embargo, cabe destacar la elevada diversidad de los quirópteros,...
Tipo: Article / Letter to the editor
Palavras-chave: Rodents; Insectivores; Bats; Systematic; Biochronology; Paleoecology; 38.22; 42.84.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/327712

Preventing injuries caused by radiotelemetry collars in reintroduced red-rumped agoutis, Dasyprocta leporina (Rodentia: Dasyproctidae), in Atlantic Forest, southeastern Brazil
Provedor de dados: 103
Autores: Cid,Bruno; Costa,Rodrigo de C. da; Balthazar,Daniel de A.; Augusto,Anderson M.; Pires,Alexandra S.; Fernandez,Fernando A. S.
Reintroduction has been recognized as a powerful conservation tool, but in order to ensure its success, animal monitoring is highly recommended. One way to monitor released animals is to put radiotelemetry collars on them. These devices, however, can harm the subjects, causing serious wounds. Our objectives in this work were to describe the injuries caused by a radiotelemetry collar model on reintroduced agoutis and to propose modifications to it. We equipped agoutis with TXE-311C radio collars (Telenax Wildlife Telemetry) before releasing them in the wild. They acquired serious wounds and one animal died. We then modified the collar structure to reduce its width and retention of water. After these modifications, the injuries did not occur again. As...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Animal welfare; Marking effects; Radiocollars; Rainforest; Rodents; Telemetry.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000100015

Community structure and population dynamics of small mammals in an urban-sylvatic interface area in Rio de Janeiro, Brazil
Provedor de dados: 103
Autores: Gentile,Rosana; Cardoso,Thiago S.; Costa-Neto,Sócrates F.; Teixeira,Bernardo R.; D’Andrea,Paulo S.
ABSTRACT The Atlantic Forest is one of the most disturbed Brazilian biomes, with 183 out of 298 species of mammals occurring in the state of Rio de Janeiro. In this study, we aimed to characterize the diversity, community structure, and habitat use of small mammals in the FIOCRUZ Atlantic Forest Campus (CFMA), including areas of Pedra Branca State Park (PBSP, subunit Pau da Fome), state of Rio de Janeiro. We also compared species diversity and composition between two moments 15 years apart (2001 and 2012-2015) and analyzed the population dynamics of the marsupial Didelphis aurita (Wied-Neuwied, 1826). Small mammal captures were made in different habitats: sylvatic-urban interface areas near human dwellings, disturbed forest, and preserved forest areas....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Diversity; Habitat disturbance; Marsupials; Rodents.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100323

Canaania obesa (Platyhelminthes: Dicrocoeliidae): redescription and new hosts records
Provedor de dados: 103
Autores: Maldonado Junior,Arnaldo; Pinheiro,Jairo; Simões,Raquel de O.; Lanfredi,Reinalda M.
The digenetic trematode Canaania obesa Travassos, 1944 (Dicrocoeliidae) was described as a parasite of the bile ducts of the rodent Akodon cursor Winge, 1887 (Cricetidae) collected in Santa Teresa, state of Espírito Santo, Brazil. In the present study, we report the occurrence of C. obesa infecting three additional sigmodontinae rodent species: Akodon montensis Thomas, 1913; Oligoryzomys nigripes Olfers, 1818 and Nectomys squamipes Brants, 1827, from three municipalities situated at Serra dos Órgãos, Rio de Janeiro, Brazil. Scanning electron microscopy showed that this helminth has a leaf-like shape with conical extremities and the ventral mid body protrudes at the acetabulum level. The microtopography of the tegument shows a heterogeneous surface with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bile ducts; Digenetic; Rodents; Sigmodontine; Trematode.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500015

Water economy in rodents: evaporative water loss and metabolic water production
Provedor de dados: 97
Autores: Cortés,Arturo; Rosenmann,Mario; Bozinovic,Francisco.
Studies on water balance in desert-dwelling granivorous rodents use evaporative water loss (EWL) and metabolic water production (MWP) to evaluate the efficiency of water regulation, expressed by the model Ta @ MWP = EWL, defined by an ambient temperature (Ta) value at (@) which MWP/EWL = 1. Here we evaluate and apply this model (1 - r²) determining water regulation efficiency, based on the energetic cost (MR) to maintain water balance (WB), that is MR-WB. To test the model, EWL was measured and MWP estimated in nine species of rodents from different localities of northern and north-central Chile (II and IV Regions): Octodon degus (Od) and O. lunatus (Olu) (Octodontidae), Abrothrix olivaceus (Ao), A. longipilis (Al), A. andinus (Ad), Phyllotis darwini (Pd),...
Tipo: Journal article
Palavras-chave: Rodents; Water economy; Arid habitats; Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200006

Gut size flexibility in rodents: what we know, and don't know, after a century of research
Provedor de dados: 97
Autores: NAYA,DANIEL E.
Phenotypic plasticity comprises a central concept in the understanding of how organisms interact with their environment, and thus, is a central topic in ecology and evolution. A particular case of phenotypic plasticity is phenotypic flexibility, which refers to reversible change in organism traits due to changes in internal or external environmental conditions. Flexibility of digestive features has been analyzed for more than a century in a myriad of different species and contexts. Studies in rodents on gut size flexibility have been developed mainly from two different áreas of the biological sciences, physiology and ecology. However, as for several other topics related with physiological ecology, both kinds of studies largely developed along sepárate...
Tipo: Journal article
Palavras-chave: Digestive physiology; Phenotypic plasticity; Physiological flexibility; Rodents.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400012

Dustbathing and intra-sexual communication of social degus, Octodon degus (Rodentia:Octodontidae)
Provedor de dados: 97
Autores: EBENSPERGER,LUIS A.
I observed the behavior of captive male and female Octodon degus to assess if dustbathing behavior plays a role in social communication among unfamiliar, same-sex conspecifics. Degus of a first group (control responders) were individually exposed during 10-min tests to an arena containing loose, clean soil. I compared the latency to first dustbathing as well as the overall frequency of dustbathing events recorded to control responders with the corresponding figures recorded to a second group of degus (experimental responders) after they were individually introduced into the same arena but with soil previously used for dustbathing by a same-sex conspecific (depositor). I also compared the location of dustbathing events by experimental responders with that...
Tipo: Journal article
Palavras-chave: Sandbathing; Scent communication; Rodents.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200011

Population density and reproduction of two Peruvian leaf-eared mice (Phyllotis spp.)
Provedor de dados: 97
Autores: ARANA,MARGARITA; RAMÍREZ,OSWALDO; SANTA MARÍA,SERGIO; KUNIMOTO,CESAR; VELARDE,RODRIGO; DE LA CRUZ,CECILIA; RUÍZ,MARíA LUISA.
Population density and reproduction were studied in two leaf-eared mice (Phyllotis spp.) in the Peruvian locality known as Lomas de Lachay. Density varied between 0-3 individuals ha-1 in P. andium, and between 0-12 individuals ha-1 in P. amicus. An annual cycle of population abundance was observed in both species. Phyllotis amicus showed no seasonal reproductive activity, but P. andium had seasonal reproduction with pregnant females principally observed between July and September. Differences in juvenile weight were related to litter size. It is likely that two young was the optimal litter size in the harsh and seasonal xeric environment of Lomas de Lachay. Our results suggest that P. amicus maintains low, highly dispersed populations in a harsh...
Tipo: Journal article
Palavras-chave: Ecology; Phyllotis; Rodents; Population; Desert.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400010

ANTAGONISM AGAINST VIBRIO CHOLERAE BY BACTERIAL DIFFUSIBLE COMPOUND IN THE FECAL MICROBIOTA OF RODENTS
Provedor de dados: 59
Autores: Silva,Simone Helena da; Vieira,Enio Cardillo; Nicoli,Jacques Robert.
In an ex vivo agar plate assay, we monitored the appearance of an inhibitory halo against Vibrio cholerae from the feces of Wistar and Fischer rats aged 10 to 42 days. The frequency of Wistar rats showing halo increased from 0% (10 days) to a maximum of 80.0% (29 days) and then decreased to 53.3% (42 days). A similar pattern was obtained with Fischer rats but with a lower intensity (maximum frequency of 50.0% by day 36). In a separate experiment, when Wistar rats were fed a low-protein diet for 7 days, the inhibitory halo decreased drastically. Three apparently different colony morphologies were isolated from the dominant fecal microbiota: a facultative anaerobe (FAN) and two strict anaerobes (SAN). The ex vivo inhibitory test showed a halo around the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vibrio cholerae; Escherichia coli; Streptococcus intermedius; Antagonism; Rodents.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141998000300016

Population dynamic study of rodents in maize
Provedor de dados: 106
Autores: Puangtong Boonsong; Korntong Puangprakhon; Yuvaluk Khoprasert; Taksin Archawakom; Chompoonut Chanyapate; Vera Chamkrachang.
4 ill., 4 tables
Palavras-chave: Corn; Maize; Rodents; Population dynamics; ข้าวโพด; หนู; การเปลี่ยนแปลงประชากร.
Ano: 1992
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4509

Trichostrongylina (Nematoda, Heligmosomoidea) coparasites in Dasyprocta fuliginosa Wagler (Rodentia, Dasyproctidae) from Brazil, with the re-establishment of the genus Avellaria Freitas &amp;amp; Lent and the description of two new species
Provedor de dados: 104
Autores: Durette-Desset,Marie C.; Gonçalves,Alessandra Q.; Pinto,Roberto M.
Two new tichostrongylid nematodes of the family Viannaiidae Durette-Desset &amp;amp; Chabaud, 1981 coparasites in Dasyprocta fuliginosa Wagler, 1832 from the State of Amazonas, Brazil, are described: Viannella trichospicula sp. nov. is differentiated from the other species of the genus by the extreme slenderness of its spicules. Avellaria intermedia sp. nov. is distinguished from the single type species Avellaria avellari Freitas &amp;amp; Lent, 1934, by a smaller number of cuticular ridges (17 versus 27), a higher ratio of spicule length/ body length (8% versus 5.6%) and spicules with a single tip. This genus, synonymized with the genus Viannella Travassos, 1918, by Durette-Desset (1968) is re-established, the female being didelphic. It is the first...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avellaria intermedia sp. nov.; Brazil; Caviomorpha; Nematodes; Rodents; Viannaiidae; Viannella trichospicula sp. nov.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000200026

Morphometric identification of small mammal footprints from ink tracking tunnels in the Brazilian Cerrado
Provedor de dados: 104
Autores: Palma,Alexandre R. T.; Gurgel-Gonçalves,Rodrigo.
An alternative method for identifying and inventorying rodents and marsupials inhabiting forests and grasslands of Brazilian Cerrado is presented and discussed. Ink tracking tunnels were designed according to the size of target species and used to build a reference collection of small mammal footprints composed of 1408 footprints belonging to 251 individuals from 30 species (21 rodents and nine marsupials). Sherman traps and ink tracking tunnels were used to conduct inventories in gallery forests. Footprints obtained in ink tracking tunnels were digitalized and compared with those in reference collection using Discriminant Analysis (DFA). DFA allowed good footprint differentiation, even among congeneric species. In DFA analysis, the first two axis were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Discriminant analysis; Marsupials; Rodents; Shape; Size; Tracks.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000200011

Ecology of small mammals in a Brazilian rural area
Provedor de dados: 104
Autores: D'Andrea,Paulo Sergio; Gentile,Rosana; Cerqueira,Rui; Grelle,Carlos Eduardo V; Horta,Claudia; Rey,Luis.
A small mammal study was carried out in Pamparrão valley, Sumidouro, State of Rio de Janeiro, Brazil, from June 1991 to July 1996. The area was characterised by small rural properties with vegetable plantations, pasture lands and small forest fragments. Small mammals were captured in seven line transects along the valley. Eleven small mammal species were captured: the didelphid marsupials Didelphis aurita, Philander frenata and Monodelphis americana, and the rodents Nectomys squamipes, Akodon cursor, Oligoryzomys nigripes, Bolomys lasiurus, Oecomys concolor (Sigmodontinae), Rattus ratlus (Murinae), Proechimys iheringi and Euryzygo-matomys guiara (Echimyidae). The heterogeneous habitat configuration probably allowed the occurrence of marsupials and more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marsupials; Rodents; Cultivated areas; Brazil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000300002

The spiny rat Proechimys guyannensis (Rodentia: Echimydae) fails to respond to intradermal inoculation with Leishmania (Viannia) braziliensis
Provedor de dados: 36
Autores: PASSOS,Stela Rechinelli; MADUREIRA,Ana Paula; ALMEIDA,Sayanne Luns Hatum de; ZANINI,Marcos Santos.
Leishmaniasis a disease of worldwide occurrence is caused by protozoa of the Leishmania genus. In Brazil, Leishmania (Viannia) braziliensis is the main parasite responsible for the American cutaneous leishmaniasis. Main hosts of this protozoa are small wild mammals particularly marsupials and rodents. The aim of this study was to evaluate if spiny rat Proechimys guyannensis (Rodentia: Echimydae) has role in the cycle of the American cutaneous leishmaniasis caused by L. (V.) braziliensis. Thus, promastigotes (the flagellate stage) of Leishmania (Viannia) braziliensis were used to inoculate seven spiny rats (Proechimys guyannensis). After inoculated intradermal at the ear pinna, nose and plantar pad, the rats were monitored for 180 days. Tissue samples...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Leishmaniasis; American cutaneous leishmaniasis; Rodents; Reservoirs.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000200239

Environmental and dam effects on cannibalism in Wistar rat litters
Provedor de dados: 3
Autores: Tarôco, Graziela; Gaya, Leila de Genova; Resende, Daniela Regina; Santos, Ivan Carlos dos; Madureira, Ana Paula.
The factors related to cannibalistic behavior of dams in a Wistar rat colony are identified and analyzed. The maternal genetic effects were tested as a random effect by the method of generalized linear models. The season at parturition, the dam´s age at parturition and the density of the room at parturition were tested as fixed effects, whereas the litter size at birth was tested as a co-variable. The genetic effect of the dam was significant for the number of cannibalized pups. Although the season at parturition, the dam´s age and room density on the day of parturition were not individually significant (p &gt; 0.05), most of the interactions between the variation sources were significant (p &lt; 0.05). Cannibalism occurred mostly in dams aged over 241...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laboratory animals; Maternal behavior; Infanticide; Rodents laboratory animals; Maternal behavior; Infanticide; Rodents.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/23015

Stratigraphic framework of early Pliocene fossil localities along the north bank of the Cimarron River, Meade County, Kansas
Provedor de dados: 41
Autores: Honey,James G.; Peláez-Campomanes,Pablo; Martin,Robert A.
The stratigraphy of early Pliocene (early Blancan) fossiliferous sediments exposed in canyons along the north bank of the Cimarron River in Meade County, Kansas is described as part of a larger, ongoing project to create a refined biostratigraphic model for late Neogene and Pleistocene mammalian fossil localities from the Meade Basin. Because the utility of previously named formation and member names is questionable, we introduce a set of informal names for stratigraphic units in our study area. Sediments in the region are up to 34 m thick, and include a basal sand and gravel ("Bishop gravel") at least 9 m thick, overlain by up to 17 m of lightto pinkish-gray, fine-grained sand and silt, with interbedded calcium carbonate layers. These fine-grained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mammals; Rodents; Pliocene; Blancan; Stratigraphy.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200015

Taxonomic revision of the flea genus AgastopsyllaJordan &amp;amp; Rothschild 1923 (Siphonaptera: Ctenophthalmidae)
Provedor de dados: 42
Autores: LÓPEZ-BERRIZBEITIA,MARIA FERNANDA; SANCHEZ,JULIANA; BARQUEZ,RUBEN MARCOS; DÍAZ,MÓNICA.
Abstract  Fleas of Argentina are receiving renewed systematic interest, but the identification of many species associated with small mammals can be problematic. We review the taxonomy of the flea genus Agastopsylla including the re-description of two species and one subspecies, and designate neotype and neallotype for Agastopsylla hirsutior, neotype for Agastopsylla nylota nylota from the “Colección Mamíferos Lillo Anexos” (CMLA), Universidad Nacional de Tucumán, Argentina, and neotype and neallotype for Agastopsylla pearsoni from the Natural History Museum (London, U.K.). Additionally, a key to identification of the species of Agastopsylla and a distribution map of the species of the genus are included.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fleas; Systematic; Type specimens; Rodents; Key identification.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100719

Mammal tooth traces in a ferruginous cave in southeastern Brazil and their relevance to cave legal protection
Provedor de dados: 42
Autores: VASCONCELOS,ANDRÉ G.; BITTENCOURT,JONATHAS S.; AULER,AUGUSTO S.
Abstract: We ﻿describe the first occurrence of biogenic traces made by mammals within an iron formation cave located in the Serra da Ferrugem Ridge, in ﻿Southeastern Brazil. These bioerosions are tooth traces produced in boulders, walls and floor within the cave. The traces occur as sets of two or more grooves, which are highly variable in size. ﻿The grooves were compared to tooth traces artificially produced by imprinting the incisors of different mammal species collected in the cave region on soft clay. ﻿Among those, the following taxa are potential tracemakers: Akodon sp., Oligoryzomys sp., Necromys lasiurus, Rhipidomys mastacalis, Oecomys gr. concolor, Trinomys moojeni, and Hydrochoerus hydrochaeris. The age of the traces is unknown; therefore, any...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioerosion; Geophagy; Gnawing traces; Rodents; Ichnology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400511

Hematological and biochemical parameters in Spotted Paca (Cuniculus paca) undergoing pharmacological restraint and general anesthesia
Provedor de dados: 45
Autores: Uscategui,R.A.R.; Santos,V.J.C.; Almeida,V.T.; Barros,F.F.P.C.; Kawanami,A.E.; Cruz,N.R.N.; Feliciano,M.A.R.; Vicente,W.R.R.
ABSTRACT The aim of this study was to assess the effects of chemical restraint, general anesthesia and opioid treatment on hematological components in Cuniculus paca. Eight healthy, adult, captivity female animals , underwent three laparoscopic procedures with a 15-day interval were evaluated. After physical restraint, an association of ketamine (25mg/kg) and midazolam (0.5mg/kg) was administered intramuscularly for chemical restraint. Posteriorly, anesthesia was induced and maintained with isoflurane; and randomly administered methadone (0.5mg/kg), tramadol (5mg/kg) or saline-placebo (0,1mL/kg) intramuscularly. After pharmacological restraint and in the final laparoscopy stage, venous blood samples were obtained for complete blood count, total plasma...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isoflurane; Ketamine; Methadone; Midazolam; Rodents.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000501558

Cardiovascular assessment in Female Spotted Paca ( Cuniculus paca )
Provedor de dados: 45
Autores: Almeida,V.T.; Uscategui,R.A.R.; Restan,W.A.Z.; Feliciano,M.A.R.; Ortiz,E.M.; Kawanami,A.E.; Barros,F.F.P.C.; Santos,V.J.C.; Vicente,W.R.R.
ABSTRACT Aiming to provide cardiovascular morphophysiology information on the Cuniculus paca, an important neotropical rodent, eight healthy adult females of this species were evaluated three times by echocardiography under general anesthesia with isoflurane every 15 days. The exams were performed by a single experienced evaluator with the animals positioned in right and left decubitus. Posteriorly, two expert evaluators measured the cardiac chambers, walls and flow patterns, by B-mode, M-mode, and Doppler ultrasonography. The resulting values were compared among evaluators and periods by the Bland-Altman agreement test and several descriptive statistics were presented for each parameter. Echocardiographic images were obtained between the second and fifth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Echocardiography; Rodents; Neotropical; Wildlife.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000100061

The ovary of Lagostomus maximus (Mammalia, Rodentia): an analysis by confocal microscopy
Provedor de dados: 47
Autores: Espinosa,María B.; Fraunhoffer,Nicolás A.; Leopardo,Noelia P.; Vitullo,Alfredo D.; Willis,Miguel A.
Lagostomus maximus is a notable mammalian model for reproductive studies. Females have an extremely high ovulation rate, which is due to down-regulation of the follicular apoptosis pathway, which ensures a large pool of developing follicles. This large pool is supported by the convoluted anatomy of the mature ovary, whose germinal tissue is found in irregularly curved ridges throughout the cortex. Medullary tissue is restricted to a minimum. Lyso Tracker Red reconstruction under confocal laser scanning microscopy was used to recognize and measure all follicular stages from primordial to antral. Unlike most mammals in which early primordial follicles are just found in fetal life, the adult ovary shows regions packed with early primordial follicles. Follicle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rodents; Germ cells; Three-dimensional analysis.
Ano: 2011
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452011000200001

A radiographic method to estimate lung volume and its use in small mammals
Provedor de dados: 48
Autores: CANALS,MAURICIO; OLIVARES,RICARDO; ROSENMANN,Mario.
In this paper we develop a method to estimate lung volume using chest x-rays of small mammals. We applied this method to assess the lung volume of several rodents. We showed that a good estimator of the lung volume is: V*L = 0.496 · V RX &amp;#8776; 1/2·V RX , where V RX is a measurement obtained from the x-ray that represents the volume of a rectangular box containing the lungs and mediastinum organs. The proposed formula may be interpreted as the volume of an ellipsoid formed by both lungs joined at their bases. When that relationship was used to estimate lung volume, values similar to those expected from allometric relationship were found in four rodents. In two others, M. musculus and R. norvegicus, lung volume was similar to reported data, although...
Tipo: Journal article
Palavras-chave: Lung volume; X-ray; Method; Rodents.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000100006

Hemoglobin affinity in Andean rodents
Provedor de dados: 48
Autores: OSTOJIC,HRVOJ; CIFUENTES,VERONICA; MONGE,CARLOS.
Blood hemoglobin oxygen affinity (P50) was measured in three Andean species and in the laboratory rat (control), all raised near sea level. Chinchilla lanigera (Molina, 1792) has an altitudinal habitat range from low Andean slopes up to 3000 m., while Chinchilla brevicaudata (Waterhouse, 1848) has an altitudinal range from 3000 to 5000 m. The laboratory type guinea pig, wild type guinea pig (Cavia porcellus), (Waterhouse, 1748), and laboratory rat (Rattus norvegicus) were also raised at sea level. The Andean species had high hemoglobin oxygen affinities (low P50) compared with the rat. Chinchilla brevicaudata had a higher affinity than Chinchilla lanigera. The wild type guinea pig had a higher affinity than the laboratory type. As has been shown in other...
Tipo: Journal article
Palavras-chave: Hemoglobin affinity; Rodents; High altitude adaptation.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000100005

Pequenos mamíferos não-voadores (Didelphimorphia, Rodentia) em campos litorâneos do extremo sul do Brasil
Provedor de dados: 49
Autores: Quintela,Fernando Marques; Gonçalves,Bruno Igure; Trindade,Gabriel Eberts; Santos,Maurício Beux dos; Tozetti,Alexandro Marques.
Non-volant small mammals are key elements in natural environments due its importance as food resource. This study aimed to investigate the species composition and habitat occupancy by non-volant small mammals (Didelphimorphia, Rodentia) in a coastal grassland area in southern Rio Grande do Sul coastal plain. Between April 2009 and March 2010 pitffal traps were used to capture small mammals in coastal grasslands associated to sand dunes and arbustive Restinga. We sampled 180 individuals including two marsupials (Cryptonanus guahybae and Didelphis albiventris) and seven rodent species (Calomys laucha, Cavia aperea, Ctenomys flamarioni, Deltamys kempi, Oligoryzomys flavescens, Oxymycterus nasutus and Scapteromys tumidus). Cryptonanus guahybae, D. albiventris...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal environments; Marsupials; Rodents; Calomys laucha; Oligoryzomys flavescens; Assemblage.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000400284

Reproduction and growth in a Neotropical arboreal mouse: Oecomys rutilus (Sigmodontinae: Cricetidae) in French Guiana
Provedor de dados: 49
Autores: Catzeflis,François.
Abstract: Postnatal growth and development of the small Neotropical mouse Oecomys rutilus (Sigmodontinae: Cricetidae) were investigated from birth to day 143, in the laboratory. Morphometric measurements at age of 3 days, of both sexes combined, revealed body weight to be 3.4 ± 0.3 g, mean tail length as 27.4 ± 1.1 mm, and mean hind foot length as 9.3 ± 0.7 mm. Body weight was found to increase steadily until at least 69 days, whereas the instantaneous growth rates of other measurements declined earlier: the daily growth of hind foot length declined to a minimum at age of 24 days, and the growth of tail and of ear declined by the age of 33 days. Average litter size for 12 captive births was 2.5, ranging from 2 to 3. The preserved eye crystalline lens was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Gompertz model; Rodents; Eye-lens weight; Life history.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200207

Rodentborne fungal pathogens in wetland agroecosystem
Provedor de dados: 58
Autores: Thomas,Manuel; Samuel K,Abraham; Kurian,Punnen.
The past few decades have witnessed an overwhelming increase in the incidence of fungal infections, particularly in immunocompromised individuals. Consequently, zoonotic diseases, especially through rodents constitute a prominent group among the emerging diseases. Rodents are commensal to man and related health risks are common. Water rats (Rattus norvegicus) are typical to Vembanadu-Kol wetland agroecosystems, where they can act as a good carrier nexus for pathogens. The present study evaluates the carrier status of water rats with respect to fungal pathogens. A total of fifty two fungi covering eighteen families were isolated. Among the isolates, eight were dermaptophytes and Chrysosporium sp. (89.18%) was the frequent isolate. The source-wise analyses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rodents; Vembanadu-Kol wetland; Fungi; Agroecosystem.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100028

Oral infection of neonate gerbils by Neospora caninum tachyzoites
Provedor de dados: 65
Autores: Ferreira,Maiara Sanitá Tafner; Vogel,Fernanda Silveira Flores; Sangioni,Luis Antonio; Weber,Augusto; Bräunig,Patricia; Vaz,Marcos André Braz; Cezar,Alfredo Skrebsky.
ABSTRACT: Neosporosis is a parasitic disease caused by the protozoan Neospora caninum which results in major economic losses for cattle breeding due to abortion and other reproductive disorders. Gerbils (Meriones unguiculatus) are commonly used as experimental models for neosporosis due to their high susceptibility to N. caninum infection, both by oocysts ingestion as by tachyzoites/bradyzoites parenteral inoculation. However, the risk of transmission by tachyzoites ingestion is not fully elucidated. In this study, infection of neonate gerbils by N. caninum (NC-1 strain) tachyzoites inoculated by the oral route and the parasite distribution in gerbils' tissues were evaluated by protozoan DNA detection. Seventeen neonate gerbils, aged 4-5 days, were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molecular diagnosis; Experimental model; Bovine neosporosis; Rodents.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000400654