Oligoryzomys flavescens. En: SAyDS�SAREM (eds.) Categorizaci�n 2019 de los mam�feros de Argentina seg�n su riesgo de extinci�n.�

2019 ◽  
Author(s):  
Isabel G�mezVillafa�e ◽  
Carolina Massa ◽  
Ra�l E. Gonz�lez-Ittig ◽  
Jimena Fraschina ◽  
Mar�a Victoria Vadell ◽  
...  
Keyword(s):  
Oligoryzomys Flavescens

scholarly journals Non-volant small mammals (Rodentia and Didelphimorphia) diversity in an isolated area of the Serra da Mantiqueira, Minas Gerais state, Brazil

2020 ◽  
Vol 15 (3) ◽  
pp. 643-662
Author(s):  
Michel Barros Faria ◽  
Rayque De Oliveira Lanes ◽  
Cibele Rodrigues Bonvicino
Keyword(s):  
Small Mammals ◽  
Minas Gerais ◽  
Mammal Species ◽  
Minas Gerais State ◽  
Extreme North ◽  
Oligoryzomys Flavescens ◽  
First Time ◽  
Excellent Tool ◽  
High Diversity ◽  
Southeastern Atlantic

The southeastern Atlantic Forest of the Zona da Mata Mineira is located in the extreme north of Minas Gerais state, Brazil. The Serra da Mantiqueira, is a mountainous region with a high diversity of small non-volant mammal species, several of which are rare species or endemic lineages. The presence of cryptic species in small mammals makes the karyotype an excellent tool for identification and detection of new lineages. We analyzed the karyotype of 14 species: 11 rodents – Abrawayaomys ruschii, Akodon cursor, Blarinomys breviceps, Delomys sublineatus, Juliomys ossitenuis, Oligoryzomys nigripes, Oligoryzomys flavescens, Oxymycterus dasytrichus, Rhipidomys tribei, Sooretamys angouya, and Thaptomys nigrita; and three marsupials – Monodelphis scalops, Philander quica, and Marmosops incanus. We described for the first time the fundamental autosomal number and the morphology of sex chromosomes of Abrawayaomys ruschii, a rare sigmodontine species, and described a new karyotype for Blarinomys. The revision of published karyotypes of the species herein studied enabled the expansion of the geographic distribution of Oligoryzomys nigripes and Delomys sublineatus.

scholarly journals Ticks infesting wild small rodents in three areas of the state of São Paulo, Brazil

2016 ◽  
Vol 46 (5) ◽  
pp. 871-875 ◽  
Author(s):  
Thiago Fernandes Martins ◽  
Marina Gea Peres ◽  
Francisco Borges Costa ◽  
Thais Silva Bacchiega ◽  
Camila Michele Appolinario ◽  
...  
Keyword(s):  
Sao Paulo ◽  
Species Level ◽  
São Paulo ◽  
Small Rodents ◽  
Wild Rodents ◽  
Morphological Examination ◽  
Paulo State ◽  
The Mean ◽  
Oligoryzomys Flavescens ◽  
Mitochondrial Rdna

ABSTRACT: From May to September 2011, a total of 138 wild rodents of the Cricetidae family were collected in the cities of Anhembi, Bofete and Torre de Pedra, in São Paulo State. All animals were examined for the presence of ticks, which were collected and identified at species level in the laboratory by morphological examination (for adults, nymphs and larvae) and molecular biology, by sequencing of a fragment of the 16S mitochondrial rDNA (for larvae). A total of 47 ticks (21 larvae and 26 nymphs) were collected from rodents, identified as 21 larvae and 23 nymphs of Amblyomma ovale (collected on Oligoryzomys nigripes , Oligoryzomys flavescens , Sooretamys agouya and Nectomys squamipes ), two nymphs of Ixodes schulzei (O. nigripes and O. flavescens ) and an Amblyomma sculptum nymph in S. agouya . The overall prevalence of parasitism by A. ovale was 4.3% for larvae, and 10.1% for nymphs. The mean intensity of parasitism was 3.5 larvae/parasitized animal, and 1.6 nymphs/parasitized animal. One O. nigripes was found parasitized by both larva and nymph of A. ovale , and another O. nigripes was parasitized simultaneously by an I. schulzei nymph and five A. ovale nymphs. This research reports the following unpublished records: A. ovale on O. flavescens , O. nigripes and S. agouya ; A. sculptum on S. agouya ; and I. schulzei on O. flavescens and O. nigripes .

scholarly journals Ontogenetic allometry in the foot size of Oligoryzomys flavescens (Waterhouse, 1837) (Rodentia, Sigmodontinae)

2015 ◽  
Vol 75 (2) ◽  
pp. 435-441 ◽  
Author(s):  
R. Maestri ◽  
R. Fornel ◽  
TRO. Freitas ◽  
JR. Marinho
Keyword(s):  
Sexual Selection ◽  
Natural Selection ◽  
Sexual Dimorphism ◽  
Encounter Rate ◽  
Allometric Growth ◽  
Positive Allometry ◽  
Rate Of Growth ◽  
Ontogenetic Allometry ◽  
Males And Females ◽  
Oligoryzomys Flavescens

Ontogenetic allometry is the study of how the size or shape of certain structures changes over the course of an animal’s development. In this study, using Huxley's formula of allometric growth (1932), we assessed the changes in the rate of growth of the feet size of the sigmodontine rodent Oligoryzomys flavescens during its ontogeny and compared differences between males and females. We find evidence of a change of polarity during the ontogenetic development of the species, with the presence of positive allometry during pregnancy and negative allometry in adulthood. Moreover, we note the presence of sexual dimorphism in the size of the feet, in which males of the species have a higher rate of growth than females. This growth pattern is positively related to escape from predators in childhood in both sexes and, in adulthood, provides a higher encounter rate of females by males, due to the larger displacement of the latter. We suggest that both the forces of natural selection and sexual selection have acted to shape the evolution of foot size in this species.

scholarly journals Pequenos mamíferos não-voadores (Didelphimorphia, Rodentia) em campos litorâneos do extremo sul do Brasil

2013 ◽  
Vol 13 (4) ◽  
pp. 284-289 ◽  
Author(s):  
Fernando Marques Quintela ◽  
Bruno Igure Gonçalves ◽  
Gabriel Eberts Trindade ◽  
Maurício Beux dos Santos ◽  
Alexandro Marques Tozetti
Keyword(s):  
Small Mammals ◽  
Coastal Plain ◽  
Sand Dunes ◽  
Food Resource ◽  
Natural Environments ◽  
Habitat Occupancy ◽  
Representative Species ◽  
Oligoryzomys Flavescens ◽  
Cavia Aperea ◽  
Calomys Laucha

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 and C. flamarioni were captured only in dunes while C. aperea and O. nasutus were recorded only in arbustive Restinga habitats. Calomys laucha, D. kempi, O. flavescens and O. nasutus were captured in both habitats. Oligoryzomys flavescens and C. laucha were the most representative species in both habitats, comprising respectively 40.7 and 38.9% of captures in dunes and 56.3 and 34.9% of captures in Restinga habitats. The species richness recorded in the sampled coastal grasslands area was lower than those previously recorded in subtropical forest coastal systems.

scholarly journals Evidence of hantavirus infection in wild rodents captured in a rural area of the state of São Paulo, Brazil

2004 ◽  
Vol 24 (2) ◽  
pp. 71-73 ◽  
Author(s):  
Elba Regina S. de Lemos ◽  
Paulo S. D'Andrea ◽  
Cibele R. Bonvicino ◽  
Kátia M. Famadas ◽  
Paula Padula ◽  
...  
Keyword(s):  
Sao Paulo ◽  
Hantavirus Infection ◽  
São Paulo ◽  
Wild Rodents ◽  
Myocastor Coypus ◽  
Suburban Areas ◽  
Andes Virus ◽  
Etiological Agents ◽  
Antigen Antibody ◽  
Oligoryzomys Flavescens

Hantaviruses are the etiological agents of the Hantavirus Cardio-Pulmonary Syndrome, a serious rodent-borne disease in Brazil. In order to investigate the occurrence of hantavirus infection in wild rodents, a survey was conducted in three different suburban areas of the municipality of Pedreira, State of São Paulo, Brazil. Of the 145 wild animals captured belonging to 12 different species identified by morphology and karyological analysis, 107 were rodents of the following species: Akodon montensis, Bolomys lasiurus, Calomys tener, Oligoryzomys nigripes, Oligoryzomys flavescens, and Myocastor coypus. Blood samples from these rodents were assayed for the presence of antibodies against hantavirus by IgG ELISA using Andes recombinant nucleocapsid antigen. Antibody reactive to Andes virus was found in two different species, O. nigripes and O. flavescens. These results indicate a potential risk for hantavirus transmission to humans in this area, where reservoir rodents are present in peridomestic settings.

scholarly journals Molecular phylogenetics and environmental niche modeling reveal a cryptic species in the Oligoryzomys flavescens complex (Rodentia, Cricetidae)

2018 ◽  
Vol 99 (2) ◽  
pp. 363-376 ◽  
Author(s):  
Paula C Rivera ◽  
Raúl E González-Ittig ◽  
Aymée Robainas Barcia ◽  
Laura Inés Trimarchi ◽  
Silvana Levis ◽  
...  
Keyword(s):  
Cryptic Species ◽  
Molecular Phylogenetics ◽  
Niche Modeling ◽  
Environmental Niche ◽  
Environmental Niche Modeling ◽  
Oligoryzomys Flavescens

Interspecific Social Relationships in Three Murid Rodent Species of Central Argentina, After Fasting and Unlimited Food

Behaviour ◽  
1995 ◽  
Vol 132 (11-12) ◽  
pp. 811-820 ◽  
Author(s):  
David N. Bilenca ◽  
Fernando O. Kravetz ◽  
Gerardo R. Cueto
Keyword(s):  
The Other ◽  
Food Sources ◽  
Feeding Time ◽  
Murid Rodent ◽  
Food Treatment ◽  
Aggressive Interactions ◽  
The Social ◽  
Akodon Azarae ◽  
Access To Food ◽  
Oligoryzomys Flavescens

AbstractWe studied the social interactions between Akodon azarae and Calomys laucha, and between A. azarae and Oligoryzomys flavescens, by means of experimental confrontations under laboratory conditions. Trials were carried out after two treatments: in the first one ('food' treatment), the animals were offered food ad libitum permanently, whereas in the other ('fast' treatment), the animals were previously submitted to fasting for 30 hours. The largest species- A. azarae - dominated the other two species, being dominant in 69.6% of the aggressive interactions in which a clear dominant/subordinate relationship was detected (N = 79). During the 'fast' treatment, A. azarae fed longer than C. laucha and O. flavescens, and it was the only species which significantly increased its feeding time with respect to 'food' treatment. There were higher frequencies of aggressive interactions in A. azarae - C. laucha trials than in A. azarae - O. flavescens trials. Comparisons of the behavioural variables between C. laucha and O. flavescens during their respective confrontations with A. azarae showed that C. laucha had significantly higher median values of freezing and walking behaviours, whereas O. flavescens showed a higher frequency of alertness. Species differences found in the laboratory support the interpretation that A. azarae is usually dominant over C. laucha and O. flavescens, and that A. azarae has the priority of access to food sources in situations of food shortage (winter) by means of its social dominance over the other two species. We suggest that the differences in the behavioural reactions of the subordinate species when meeting the dominant one may help to explain the different scales of spatial segregation that C. laucha and O. flavescens maintain with A. azarae in the field.

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