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Search Results: 1 - 10 of 477199 matches for " Ricardo A. Ojeda "
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Citotaxonomía y distribución del género Eligmodontia (Rodentia, Cricetidae, Sigmodontinae)
Cecilia Lanzone,Ricardo A. Ojeda
Mastozoolog?-a neotropical , 2005,
Abstract:
Taxonomía alfa de Chelemys y Euneomys (Rodentia, Cricetidae): el número diploide de ejemplares topotípicos de C. macronyx y E. mordax
Agustina A. Ojeda,Guillermo D' Elía,Ricardo A. Ojeda
Mastozoolog?-a neotropical , 2005,
Abstract:
áreas de acción en un ensamble de roedores del Desierto del Monte (Mendoza, Argentina)
Corbalán,Valeria E.; Ojeda,Ricardo A.;
Mastozoolog?-a neotropical , 2005,
Abstract: in the central portion of the monte desert four small rodent species coexist: graomys griseoflavus, akodon molinae, eligmodontia typus, and calomys musculinus . using the convex polygon method, we assessed the home range of these species at different habitats and made comparisons among species, and between sexes and different seasons of the year. we found that home range did not differ among species, but there is a tendency to increase range size as the species corporal size increases. overlapping of home range was different at different seasons of the year, probably due to different population densities, but home range size was constant along the year. habitat type and sex affect home range only for g. griseoflavus and a. molinae, respectively.
Resumen Taller Los mamíferos de las selvas nubladas de las Yungas y propuestas para su conservación , XVII Jornadas de Mastozoología
Ricardo A. Ojeda,Rubén M. Barquez
Mastozoolog?-a neotropical , 2003,
Abstract:
áreas de acción en un ensamble de roedores del desierto del Monte (Mendoza, Argentina)
Valeria E. Corbalán,Ricardo A. Ojeda
Mastozoolog?-a neotropical , 2005,
Abstract: Home range of a rodent population in the Monte desert (Mendoza, Argentina. In the central portion of the Monte desert four small rodent species coexist: Graomys griseoflavus, Akodon molinae, Eligmodontia typus, and Calomys musculinus. Using the Convex Polygon Method, we assessed the home range of these species at different habitats and made comparisons among species, and between sexes and different seasons of the year. We found that home range did not differ among species, but there is a tendency to increase range size as the species corporal size increases. Overlapping of home range was different at different seasons of the year, probably due to different population densities, but home range size was constant along the year. Habitat type and sex affect home range only for G. griseoflavus and A. molinae, respectively.
School Violence in Contexts of High Social Marginalization and Ethnic Population of Yucatan, Mexico  [PDF]
Yolanda Oliva Pe?a, Andrés Santana Carvajal, Luis Cambranes Puc, Ricardo Ojeda Rodríguez
Psychology (PSYCH) , 2018, DOI: 10.4236/psych.2018.915168
Abstract: The objective of this work was to determine the magnitude and frequency of school violence in the eastern part of the state of Yucatan, Mexico, which is populated primarily by Maya-speakers and also by communities of high social marginalization, factors associated with adolescence, and the condition of gender, by contexts that have been poorly documented in the face of the phenomenon of violence in secondary schools. Quantitative study through a self-applied survey of 1432 high school students is possible to conclude that the conditions of gender, social and ethnic marginalization are elements that come together in vulnerabilities to present violence in social contexts with a strong magnitude. The students show similar proportions of violence in to teachers (93%), a significant difference in women than the recorded by men (p = 0.000), with a greater number of cases in moderate and severe intensity. Peer violence is manifested a statistically significant difference by men and women, in which women reflect a greater intensity, with a higher number of cases in violence of moderate and severe intensity (p = 0.000).
Nuevos registros de Tympanoctomys barrerae (Rodentia, Octodontidae)
Ojeda,Agustina A.; Gallardo,Milton H.; Mondaca,Fredy; Ojeda,Ricardo A.;
Mastozoolog?-a neotropical , 2007,
Abstract: the red vizcacha rat, tympanoctomys barrerae, shows a reduced geographic range and a patchy distribution of its populations associated to salt basins. we report new distributional records for san juan, neuquén and la pampa provinces, with a significant extension of their septentrional (340 km) and meridional (279 km) distribution. these set of data, coupled with the fossil record recently discovered, expand the past and actual distribution for the genera considerably.
Nuevos registros de tympanoctomys barrerae (Rodentia, octodontidae)
Agustina A. Ojeda,Milton H. Gallardo,Fredy Mondaca,Ricardo A. Ojeda
Mastozoolog?-a neotropical , 2007,
Abstract: 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 meridional (279 km) de la especie. Este conjunto de datos, sumado al registro fósil recientemente descubierto, extiende notablemente la distribución pasada y reciente de este género.
Puntos calientes para la conservación de mamíferos en la provincia de Tucumán, Argentina
Solana Tabeni,M.; Benjamín Bender,J.; Ojeda,Ricardo A.;
Mastozoolog?-a neotropical , 2004,
Abstract: the identification of priority areas for the conservation of biodiversity requires the use of methods that represent all the species efficiently. in this work, data of occurrence of mammals in tucumán province were used to identify areas of importance for the conservation of this group using quantitative methods based on diverse approaches - richness, rarity, average value of conservation, complementary areas - and of the application of an index for the selection of species that could act as an umbrella for sympatric species. the overlaps of hotspots evidenced in the combination of approaches (e.g. richness, rarity, threats, or average value of conservation) was in general very low. however, when considering the approaches independently,the forest of yungas was the bioma that concentrated the hotspots of richness, threatened species and rarity, determining its conservation priority. in terms of maximizing the richness of species while minimizing the number of areas needed for their protection, the selection of umbrella species or the selection of complementary cells can be the best methods to optimize the conservation of regional assemblage of species.
Puntos calientes para la conservación de mamíferos en la provincia de Tucumán, Argentina
M. Solana Tabeni,J. Benjamin Bender,Ricardo A. Ojeda
Mastozoolog?-a neotropical , 2004,
Abstract:
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