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Dry season diet composition of Eligmodontia moreni (Rodentia, Cricetidae, Sigmodontinae) in a hyper-arid region of the Monte desert (Mendoza, Argentina)  [cached]
Cecilia Lanzone,Verónica Chillo,Daniela Rodríguez,María Ana Dacar
Multequina , 2012,
Abstract: Presentamos la dieta de Eligmodontia moreni durante la estación seca en una región hiperárida del desierto del Monte. Encontramos diferencias en el consumo de las diferentes categorías, resultando las hojas y los artrópodos los ítems más utilizados, seguidos por las semillas. A pesar del elevado consumo de hojas, la especie debe considerarse omnívora con tendencia a la herbivoría debido a la elevada variabilidad en su dieta. Los altos porcentajes de artrópodos en la dieta no han sido registrados para otras especies del género. E. moreni muestra una importante flexibilidad en la dieta lo cual puede resultar ventajoso en ambientes donde los recursos tróficos son escasos e impredecibles.
Citotaxonomía y distribución del género Eligmodontia (Rodentia, Cricetidae, Sigmodontinae)  [cached]
Cecilia Lanzone,Ricardo A. Ojeda
Mastozoolog?-a neotropical , 2005,
Abstract:
SISTEMáTICA Y EVOLUCIóN DEL GéNERO Eligmodontia (RODENTIA, CRICETIDAE, SIGMODONTINAE)  [cached]
CECILIA LANZONE
Mastozoolog?-a neotropical , 2009,
Abstract:
Key to the genera of the Tribe Oryzomyini (Rodentia: Cricetidae: Sigmodontinae)
Weksler,Marcelo; Percequillo,Alexandre R.;
Mastozoolog?-a neotropical , 2011,
Abstract: due to recent phylogenetic and revisionary taxonomic work, the systematics of the tribe oryzomyini, the largest group of sigmodontine rodents, underwent profound changes. we present here an artificial key for the genera of this group of rodents, enabling researchers to identify oryzomyines using external, cranial and dental characteristics. we also present the most up-to-date diversity assessment of the tribe, in which we recognize 33 extant and extinct genera (plus three undescribed genus-group taxa) and 130 valid species.
Chromosomal characterization of Irenomys Tarsalis (Rodentia, Cricetidae, Sigmodontinae)
Ojeda,Agustina A.; Ríos,Carolina A.; Gallardo,Milton H.;
Mastozoolog?-a neotropical , 2004,
Abstract: the systematics of i. tarsalis is far from being understood. morphological and molecular analyses have given contradictory results, pointing towards its inclusion or exclusion from the phyllotini. the karyotype of irenomys tarsalis, as well as its c-bands are reported for the first time. the species has 2n = 64 chromosomes (fn = 98) and a c-banding pattern characterized by small amounts of centromeric heterochromatin. although the high diploid number and the c-bands of i. tarsalis support the notion of the species′ ancestral karyotypic condition, its affiliation within the sigmodontines cannot be discerned by the data.
KEY TO THE GENERA OF THE TRIBE ORYZOMYINI (RODENTIA: CRICETIDAE: SIGMODONTINAE)  [cached]
Marcelo Weksler,Alexandre R. Percequillo
Mastozoolog?-a neotropical , 2011,
Abstract: Due to recent phylogenetic and revisionary taxonomic work, the systematics of the Tribe Oryzomyini, the largest group of sigmodontine rodents, underwent profound changes. We present here an artificial key for the genera of this group of rodents, enabling researchers to identify oryzomyines using external, cranial and dental characteristics. We also present the most up-to-date diversity assessment of the tribe, in which we recognize 33 extant and extinct genera (plus three undescribed genus-group taxa) and 130 valid species.
A predictive distribution model for Andinomys edax (Rodentia: Cricetidae) in Argentina
Jayat,Pablo; Pacheco,Silvia; Ortiz,E.;
Mastozoolog?-a neotropical , 2009,
Abstract: we studied the distribution of andinomys edax (rodentia, cricetidae, sigmodontinae) in northwestern argentina. presence data obtained from field records, museum specimens and literature were used to model the potential distribution of this species. andinomys edax was known in argentina from only 41 occurrence localities, most of them restricted to jujuy province. here we add new localities from catamarca, jujuy, salta and tucumán provinces. we used the maximum entropy method (maxent) and seven environmental variables to produce a potential distribution map of the species. the 7.015 cumulative threshold (corresponding to the equal test of sensitivity and specificity) was the most efficient hypothetical distribution according to the omission rate. the area under the curve (auc) was of 0.987 for training data. the model indicates that a. edax is mainly distributed on the more humid eastern montane ranges in the region, associated to high altitude grasslands and ecotonal zones between 1500 and 4000 m in yungas, prepuna, puna and high andean environments. these results, as well as the known fossil record for the species in argentina, indicate the ecological plasticity of a. edax, present in the region at least since middle-upper pleistocene times.
A PREDICTIVE DISTRIBUTION MODEL FOR Andinomys edax (RODENTIA: CRICETIDAE) IN ARGENTINA  [cached]
Pablo Jayat,Silvia Pacheco,Pablo E. Ortiz
Mastozoolog?-a neotropical , 2009,
Abstract: Se estudió la distribución de Andinomys edax (Rodentia, Cricetidae, Sigmodontinae) en el noroeste de Argentina. Para modelar la distribución potencial de la especie se usaron datos de presencia obtenidos a partir de registros de campo, de especímenes depositados en colecciones y de la literatura. Andinomys edax se conocía en Argentina por sólo 41 localidades, la mayoría de ellas en la provincia de Jujuy. En este trabajo se adicionan nuevas localidades para las provincias de Catamarca, Jujuy, Salta y Tucumán. El mapa de distribución potencial de la especie fue modelado utilizando el método de máxima entropía (Maxent) y siete variables ambientales. De acuerdo con la tasa de omisión, el umbral acumulativo de 7.015 (correspondiente al test de igualdad de sensitividad y especificidad) determinó la distribución hipotética más eficiente. El área bajo la curva (AUC) para el test ROC fue de 0.987 para los datos de entrenamiento. De acuerdo con el modelo, A. edax se distribuye principalmente sobre las laderas orientales húmedas de los cordones monta osos de la región, asociada a pastizales de altura y sus ecotonos entre 1500 y 4000 m, en ambientes de Yungas, Prepuna, Puna y Altos Andes. Estos resultados, así como el registro fósil de la especie en Argentina, indican una gran plasticidad ecológica de A. edax, presente en la región al menos desde el Pleistoceno medio-superior.
The adjustment of Calomys callosus (Rodentia, Cricetidae) to food deprivation
Ades, César;Kolde, Renate Edla;
Revista Brasileira de Zoologia , 1989, DOI: 10.1590/S0101-81751989000200005
Abstract: the adjustment of calomys callosus (rodentia, cricetidae) to intermittent food deprivation was investigated. animals subjected either to 24-hr or to 48-hr repeated periods of deprivation successfully compensated, showing (1) increases in post-fast intake relatively to the intake by control animals; (2) rapid recovery of the baseline levels of body wieght. the regulatory ability of c. callosus is comparable, in such respects, to the ability of the common rat and some other rodents but it is remarkably different from the hamster's.
Karyotypic characterization and new geographical record of Salinomys delicatus (Rodentia, Cricetidae, Sigmodontinae)  [cached]
Cecilia Lanzone,Ricardo A. Ojeda,Soledad Albanese,Daniela Rodríguez
Mastozoolog?-a neotropical , 2005,
Abstract:
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