Octomys mimax (Rodentia: Octodontidae)

Sobrero, Raúl; Campos, Valeria E.; Giannoni, Stella M.; Ebensperger, Luis A.

doi:10.1644/853.1

Cited by 19 publications

(24 citation statements)

References 42 publications

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“…We performed a Principal Component Analysis [Relative Warps (RW) Analysis] on the resulting Procrustes coordinates in order to summarize and describe the major trends in cranial and mandibular shape variation among genera. For the purpose of interpreting morphological features of Prospaniomys, we made comparisons with living octodontoids that were distributed among three broad habit categories (Nowak 1991;Eisenberg and Redford 1999;Lessa et al 2008;Sobrero et al 2010): epigean (Abrocoma, Echimys, Kannabateomys, Proechimys, Thrichomys), fossorial (Clyomys, Euryzygomatomys, Aconaemys, Octodon, Octodontomys), and subterranean (Ctenomys, Spalacopus). Differences in shape were described in terms of the variation in deformation grids (Bookstein 1991).…”

Section: Analysis Of Skull and Mandible Shapementioning

confidence: 99%

First Approach to the Paleobiology of Extinct Prospaniomys (Rodentia, Hystricognathi, Octodontoidea) Through Head Muscle Reconstruction and the Study of Craniomandibular Shape Variation

Álvarez

Arnal

2015

J Mammal Evol

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†Prospaniomys is a basal octodontoid recorded in the early Miocene in Patagonia (Argentina; Colhuehuapian SALMA). Nearly complete cranial and mandibular remains known for this genus provide a unique opportunity to explore its paleobiology. For this, masticatory muscles were reconstructed and craniomandibular shape variation assessed. While such reconstruction indicates that most masticatory muscles would have presented moderate development, both the masseter lateralis and posterior muscles were poorly developed. In contrast, we found that the temporalis muscle was well developed, while conspicuous postorbital constriction, postorbital processes, and superior temporal lines revealed a substantial orbital portion of this muscle. According to geometric morphometric results, craniomandibular shape was interpreted as generalized. Features such as shortened palate, narrower bizygomatic width, orthodont incisors, enlarged incisive foramina, and a shallow jaw could be linked to epigean habits. The moderate development of auditory bullae in Prospaniomys suggests that it is unlikely that it may have lived in extreme arid environments. Additionally, based on its generalized dental morphology, an omnivorous or generalized herbivorous diet that may have included leaves, fruit, and potentially animal matter was inferred. By the early Miocene, Patagonia experienced the initial expansion stage of arid-adapted vegetation, with grasses present in low amounts and abundant forests. Generalized habits and soft and nonabrasive diet suggest that Prospaniomys was possibly associated with more closed environments. Morphology alone cannot be used as an environmental proxy, but it could undoubtedly contribute to the interpretations based on data provided by paleobotanical and geological frameworks in studies on the evolution of environments.

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Section: Analysis Of Skull and Mandible Shapementioning

confidence: 99%

First Approach to the Paleobiology of Extinct Prospaniomys (Rodentia, Hystricognathi, Octodontoidea) Through Head Muscle Reconstruction and the Study of Craniomandibular Shape Variation

Álvarez

Arnal

2015

J Mammal Evol

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“…It occurs in the temperate Monte Desert and in a transition area between the Monte and Chaco Seco. Information on the ecology of the viscacha rat is scarce; the population from Ischigualasto Provincial Park, the one occur ring in the most arid portion of the Monte Desert, has received the greatest attention so far (see review in Sobrero et al 2010). The viscacha rat was captured in habitats dominated by hard substrates (Traba et al 2010) and was found to typically use rock crevices with relatively low vegetation cover as resting places (Ebensperger et al 2008), suggesting that it would behave as a species associated with coarse-grained selection.…”

Section: Introductionmentioning

confidence: 99%

Microhabitat selection by Octomys mimax (Rodentia: Octodontidae) in the Monte Desert is affected by attributes and thermal properties of crevices

Campos

Andino

Cappa

et al. 2013

Rev. chil. hist. nat.

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“…Estos últimos frutos son leñosos y duros, y la rata vizcacha los perfora para extraer las semillas. También remueve semillas de Prosopis a partir de los excrementos de burro y mara (Sobrero et al 2010). Los resultados del presente trabajo mostraron que la dieta de la rata vizcacha incluyó los arbustos P. torquata y C. atamisquea.…”

Section: Discussionunclassified

Relaciones tróficas entre mamíferos herbívoros nativos y exóticos del Parque Provincial Ischigualasto (San Juan, Argentina)

et al. 2017

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RESUMEN.Cada vez es más frecuente que las comunidades de herbívoros estén compuestas por especies nativas y exóticas. Las especies exóticas, con una historia reciente de coexistencia entre ellas y con las especies nativas, presentarían menos estrategias de reparto de recursos que las especies nativas, que co-evolucionaron juntas y establecieron relaciones entre sí y su ambiente. Con el fin de evaluar las relaciones tróficas en una comunidad de herbívoros que coexisten en el Parque Provincial Ischigualasto se analizaron las composiciones estacionales de las dietas, las amplitudes de los nichos tróficos y los solapamientos dietarios, y se realizaron asociaciones en base a la condición (nativo o exótico) y a los tamaños corporales (grandes o pequeños). En la región hiperárida del Monte, donde se desarrolló el estudio, los arbustos tuvieron la cobertura más representativa a lo largo del año. Las dietas de los herbívoros nativos y exóticos estuvieron basadas en este grupo funcional de plantas. En particular, las especies nativas mantuvieron un uso intenso y sostenido de los arbustos durante las estaciones húmeda y seca. Las especies exóticas presentaron mayor similitud entre sus dietas y amplitudes de nicho trófico constantes a lo largo del año (y más amplias que las amplitudes de nicho de las especies nativas). Las dietas de las especies nativas presentaron menor similitud entre ellas y los nichos tróficos fueron más estrechos, especialmente en la estación seca. La superposición de dieta entre nativos y exóticos no varió entre las estaciones ni siquiera considerando especies de tamaños corporales similares. Es probable que no se hayan detectado superposiciones importantes en el uso de los recursos tróficos debido a las densidades bajas de especies exóticas presentes en la actualidad en el Parque Provincial Ischigualasto. De todas maneras, se recomienda un monitoreo permanente que permita evaluar potencial competencia entre especies nativas y exóticas.[Palabras clave: burro, Desierto del Monte, dietas, guanaco, liebre europea, mara, rata vizcacha, vaca] ABSTRACT. Trophic interactions among native and exotic herbivorous mammals in the Ischigualasto ProvincialPark (San Juan, Argentina). The communities of herbivores are more frequently composed of native and exotic species. Exotic species, with a recent history of co-occurrence among them and with native species, would exhibit less resource distribution strategies than native species, which co-evolved together establishing relationships between them and their environment. Aiming to assess trophic relationships in a community of herbivores that co-occur in Ischigualasto Provincial Park, we analyzed seasonal diet compositions, trophic niche breadth and diet overlap, and made associations based on condition (native or exotic) and body size (large or small). In the hyper-arid Monte region, where the study was conducted, shrub cover was the most representative cover throughout the year. The diets of native and exotic herbivores were based on this functional group of plants....

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Octomys mimax (Rodentia: Octodontidae)

Cited by 19 publications

References 42 publications

First Approach to the Paleobiology of Extinct Prospaniomys (Rodentia, Hystricognathi, Octodontoidea) Through Head Muscle Reconstruction and the Study of Craniomandibular Shape Variation

First Approach to the Paleobiology of Extinct Prospaniomys (Rodentia, Hystricognathi, Octodontoidea) Through Head Muscle Reconstruction and the Study of Craniomandibular Shape Variation

Microhabitat selection by Octomys mimax (Rodentia: Octodontidae) in the Monte Desert is affected by attributes and thermal properties of crevices

Relaciones tróficas entre mamíferos herbívoros nativos y exóticos del Parque Provincial Ischigualasto (San Juan, Argentina)

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