Agustina A. Ojeda

Agustina A. Ojeda
National Scientific and Technical Research Council | conicet · IADIZA - Instituto Argentino de Investigaciones de las Zonas Aridas

Ph.D

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64
Publications
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354
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Publications

Publications (64)
Article
Establishing the availability of the recently erected binomen Phyllotis pehuenche (Rodentia, Cricetidae, Sigmodontinae) Estableciendo la disponibilidad del binomio recientemente erigido Phyllotis pehuenche (Rodetia, Cricetidae, Sigmodontinae) In 2021, Jayat et al. propose a new species of sigmodontine rodent, named Phyllotis pehuenche, for the popu...
Article
The Ctenomys population from Anillaco, La Rioja Province, Argentina has been the subject of detailed studies of circadian rhythms, vocalization, ecology and spatial dynamics. However, the taxonomy and systematics of this population as well as populations of Ctenomys inhabiting Andean areas of this province is unknown. In this study, we present the...
Article
Full-text available
Comparative studies of closely related species provide a powerful means of identifying the ecological and demographic factors associated with variation in mammalian social systems. Although most members of the subterranean rodent genus Ctenomys are thought to be solitary, the highland tuco-tuco (C. opimus) is group living, meaning that multiple adu...
Article
Based on previously published molecular (mitochondrial) and herein provided morphological (qualitative and quantitative data) evidence, we describe a new species of leaf-eared mouse of the genus Phyllotis. The new species is morphometrically distinct when compared with other phylogenetically or geographically close species of Phyllotis, showing sev...
Article
Full-text available
Aim: Comprehensive, global information on species' occurrences is an essential biodiversity variable and central to a range of applications in ecology, evolution, biogeography and conservation. Expert range maps often represent a species' only available distributional information and play an increasing role in conservation assessments and macroeco...
Article
Rodents are an important component of South America fauna. Their high diversity has motivated researchers to continually review their taxonomy, genetic diversity, species limits, and phylogenetic relationships. We apply DNA‐barcodes for assessing the taxonomic and genetic diversity in the two major lineages of South American rodents: caviomorphs an...
Article
Phyllotis Waterhouse 1837 is one of the most studied genera of South American cricetid rodents. As currently understood, it includes 20 small to medium-sized species of predominantly rocky habitats. Among them, populations of the yellow-rumped leaf-eared mouse, traditionally referred to P. xanthopygus (Waterhouse 1837), are the most widely distribu...
Chapter
Molecular genetic data are increasingly used to assist in species identification and delimitation, and provide a powerful tool to detect conservation units (population/s of an organism considered to be different for conservation purposes). In combination with distributional and ecological information, molecular genetic data can contribute to establ...
Article
The genus Euneomys is mostly distributed in the open environments of the central and southern Andes, adjacent Patagonian steppes of Argentina and Chile, and in several islands of the Tierra del Fuego Archipelago. This genus includes three living species: Euneomys chinchilloides, Euneomys fossor, and Euneomys mordax. Euneomys fossor is a poorly know...
Article
The leaf-eared mouse, Phyllotis xanthopygus (Waterhouse 1837) is a widely distributed sigmodontine rodent in South America, with populations ranging from central Peru to southern Argentina and Chile. Previous morphological and molecular contributions have suggested that P. xanthopygus represents a species complex. In order to characterize and discl...
Article
Viscacha rats (genus Tympanoctomys Yepes, 1942) are ecologically, physiologically, and behaviorally unusual octodontid rodents endemic to the Monte and Patagonian desert biomes of Argentina. The geographic ranges of the different species of Tympanoctomys have been described in general terms but have not been associated with spatial and climate data...
Article
Full-text available
Background Leptospirosis is a zoonotic disease that can be transmitted by contact with the urine of infected mammals. Rodents play a mayor role in the transmission of leptospires to humans. The province of Santa Fe reports the greatest number of cases in Argentina. Yet, in this region, there are still knowledge gaps regarding the diversity of roden...
Article
Rodents are a very diverse group with large chromosome variability. One of the most species rich linage in the Neotropics is the Sigmodontinae. Among them, the tribe Abrotrichini was recently defined and its taxonomy and phylogeny were mostly elucidated through molecular and morphological evidence. Meanwhile, chromosome data were only secondarily u...
Technical Report
Tympanoctomys barrerae. Rata vizcacha colorada. Cita sugerida: Ojeda, Agustina A.; Tarquino-Carbonell, Andrea del Pilar (2019). Tympanoctomys barrerae. Categorización 2019 de los mamíferos de Argentina según su riesgo de extinción. Lista Roja de los mamíferos de Argentina. Versión digital: http://cma.sarem.org.ar
Article
Akodon oenos, a nominal form with type locality in northern Mendoza province, Argentina, has an intricate taxonomic history. Recently, it was considered a junior synonym of Akodon spegazzinii on the basis of morphological similarities of one individual captured in southern Mendoza with specimens belonging to the type series of A. oenos, plus the ge...
Article
The leaf-eared mice of the genus Phyllotis (Cricetidae, Phyllotini) encompasses at least 20 species of medium-sized Neo-tropical rodents mostly distributed throughout the Andean region. Its limits and contents were reviewed by several au-thors, based both on morphological and molecular data. However, no integrative approaches were conducted based o...
Conference Paper
Full-text available
La organización espacial y utilización de hábitats por las especies son temas centrales en ecología. En esta revisión se analiza la distribución espacial a diferentes resoluciones de áreas de estudio (multiescala) en 6 familias de roedores subterráneos y semifosoriales de biomas de desierto del continente americano, africano y australiano. Se reali...
Article
Full-text available
This contribution is a tribute to José Yepes on the 75th anniversary of his description of the genus Tympanoctomys, and the 90th anniversary of his admission to the Argentine Museum of Natural Sciences “Bernardino Rivadavia”. Viscacha rats are the epitome of South American rodents adapted to desert habitats, and are a true model, not only to presen...
Article
Full-text available
The genome of the red vizcacha rat (Rodentia, Octodontidae, Tympanoctomys barrerae) is the largest of all mammals, and about double the size of their close relative, the mountain vizcacha rat Octomys mimax, even though the lineages that gave rise to these species diverged from each other only about 5 Ma. The mechanism for this rapid genome expansio...
Conference Paper
Full-text available
Arid ecosystems represent heterogeneous scenarios, mainly determining the distribution of resources and species. Its heterogeneity reflects different scales for variations in topography, climate, precipitation and vegetation. Faced with habitat fragmentation, is necessary inferring which factors affect small mammals dynamics. Red Viscacha Rat is en...
Article
Habitat partitioning is considered one of the main mechanisms of coexistence among small mammals. This is especially evident in arid environments where resources are particularly scarce. Habitat characteristics such as vegetation heterogeneity and complexity are expected to increase species coexistence, increasing the number of microhabitats that c...
Article
Under the DNA Barcode initiative, we used the mitochondrial locus cytochrome c oxidase I to test if this molecular marker would reliably distinguish among lizard species of the patagonicus clade of Phymaturus. Using 18 described species and two populations of unidentified species, we calculated intra- and interpopulation genetic distances for all o...
Conference Paper
Los modelos predictivos de distribución de roedores en paisajes áridos heterogéneos de Argentina es un tema de incipiente desarrollo. Dentro de los octodóntidos, Tympanoctomys es un especialista del desierto, presenta adaptaciones a los ambientes xéricos y distribución restringida y en parches. El objetivo del estudio fue identificar la distribució...
Chapter
Caviomorph rodents were one of the earliest colonizers of the Neotropics and are now conspicuous inhabitants there. The aim of this chapter is to provide a global synthesis of the caviomorphs, their phylogeny, and biogeographical and ecological diversification. We provide a general introduction to the radiation of major clades and phylogenetic rela...
Chapter
Full-text available
Hystricognath rodents probably arrived from Africa and diversified rapidly into major clades during the Eocene-Early Oligocene. Caviomorph rodents radiated in different directions involving body size, ecomorphological, physiological and behavioral traits which make them convergent to several groups of mammals. The aim of this chapter is to analyze...
Article
Full-text available
Euneomys is a genus of sigmodontine rodent endemic to South America, distributed along the Andes of Argentina and Chile and in adjoining Patagonian steppe. Here, we studied specimens of Euneomys from different localities in the Central Andes, Mendoza Province, Argentina. Karyotypic analyses confirm the presence of a new karyomorph of Euneomys chinc...
Chapter
Full-text available
Hystricognath rodents probably arrived from Africa and diversified rapidly into major clades during the Eocene-Early Oligocene. Caviomorph rodents radiated in different directions involving body size, ecomorphological, physiological and behavioral traits which make them convergent to several groups of mammals. The aim of this chapter is to analyze...
Article
Full-text available
Phyllotis xanthopygus (Waterhouse, 1837) is an Andean rodent endemic to South America. Despite its wide geographical distribution in Argentina, few individuals have been studied on the cytogenetic level and only through conventional staining. In this work, chromosome characterization of Argentine samples of this species was performed using solid st...
Article
Full-text available
Genetic variability in rodents is extremely wide and a fruitful field of research. Graomys griseoflavus is a phyllotine rodent, endemic to South America, polymorphic for Rb rearrangements. However, few individuals and populations were studied cytogenetically to date, considering its wide distribution. We present and compare chromosomal data from Me...
Conference Paper
Full-text available
The New World hystricognath rodents (Caviomorpha) probably came from Africa and diversified into major clades during the Eocene-Oligocene. In this presentation we address the biogeographical and ecological diversification of caviomorphs within a recent phylogenetic framework. Our main results show that: a) The Amazonia and the Atlantic forest are t...
Article
Full-text available
Caviomorph rodents represent one of the most distinctive groups of mammals in southern South America drylands; they colonized South America from Africa via trans-oceanic dispersions in the Eocene (40–50 Ma) and underwent an extraordinary ecological radiation after their arrival, thus making this group of great interest for biogeographic and evoluti...
Article
Caviomorph rodents represent one of the most distinctive groups of mammals in southern South America drylands; they colonized South America from Africa via trans-oceanic dispersions in the Eocene (40–50 Ma) and underwent an extraordinary ecological radiation after their arrival, thus making this group of great interest for biogeographic and evoluti...
Article
Full-text available
Subterranean tuco-tucos of the genus Ctenomys are caviomorph rodents comprising a complex of over 50 nominal species found in the southern half of South America. The validity of several nominal forms awaits a proper assessment. The population of Ctenomys from Ñacuñán Biosphere Reserve (Mendoza, Argentina) has been classically considered to represen...
Article
Full-text available
The delicate mouse (Salinomys delicatus) is a small rodent endemic of Argentina. It has been considered vulnerable to extinction because of its restricted and patchy distribution, small population size and specialization on salty habitats. Besides its morphological and physiological adaptations to survive in arid and salty habitats, there is still...
Article
Full-text available
The delicate mouse (Salinomys delicatus) is a small rodent endemic of Argentina. It has been considered vulnerable to extinction because of its restricted and patchy distribution, small population size and specialization on salty habitats. Besides its morphological and physiological adaptations to survive in arid and salty habitats, there is still...
Article
Full-text available
Salinomys delicatus is considered a rare species due to its restricted and patchy distribution, poor records and low abundances. It is also the phyllotine with the lowest known diploid chromosome number (2n = 18), however its sex chromosome system has never been described. Here, we studied the chromosomes of six females and three males with bands G...
Article
Patterns of evolution and systematics of sigmodontine rodents are matters of continuous revision and debate. The silky mouse, Eligmodontia, is a phyllotine rodent adapted to arid environments. Chromosomal and molecular data have identified six species in this genus. Among these E. puerulus and E. moreni are sister taxa from the high Andean and lowl...
Article
Full-text available
To increase our understanding of the speciation process occurred in the sibling species Graomys griseoflavus and Graomys centralis, a phylogeographic study was conducted based on sequences of a hypervariable segment of the mtDNA D-loop region. The resulting haplotype phylogenetic network showed two well-defined clusters, one for each species. The c...
Article
Full-text available
The red viscacha rat, Tympanoctomys barrerae, is an octodontid rodent endemic to the arid west-central and southern regions of Argentina. It is solitary, lives in complex burrows built in soft soil, and occurs at low population densities in patches associated with salt basins and sand dunes in lowland habitats of the Monte and Patagonia deserts. Th...
Article
Full-text available
The red vizcacha rat (Tympanoctomys barrerae) is an octodontid which has adapted to the aridity of the Monte desert biome of Argentina (Ojeda et al. 1996, 1999, Mares et al. 1997). Known from only 11 disjunct popu-lations, its present distributional range extends from Ischigualasto National Park (La Rioja province, 308059 S, 678569 W) to the Añ elo...
Article
Full-text available
La rata vizcacha colorada, Tympanoctomys barrerae, presenta un rango geográfico reducido y ocurre a modo de parches poblacionales aislados y asociados a salares. En esta nota reportamos nuevos registros de distribución para las provincias de San Juan, Neuquén y La Pampa, y ampliamos considerablemente la distribución septentrional (340 km) y meridio...
Article
The monotypic genus Pearsonomys is one of the least studied sigmodontine genera, so far known only from its holotype. We record four new localities from the Región de Los Lagos (southern Chile) for P. annectens expanding its known distribution by approximately 217 km. Next, we present a phylogenetic analysis based on nuclear DNA sequences aimed to...
Article
Full-text available
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...

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Cited By
    • National Scientific and Technical Research Council
    • INSTITUTO ARGENTINO DE INVESTIGACIONES DE ZONAS ARIDAS (IADIZA), National Scientific and Technical Research Council
    • Universidade Federal do Rio Grande do Sul
    • Instituto Argentino de Investigaciones de las Zonas Aridas (IADIZA) CCT CONICET Mendoza
    • National Scientific and Technical Research Council