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Search Results: 1 - 10 of 221238 matches for " Jonas;Cáceres "
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Use of camera-traps in natural trails and shelters for the mammalian survey in the Atlantic Forest
Melo, Geruza L.;Sponchiado, Jonas;Cáceres, Nilton C.;
Iheringia. Série Zoologia , 2012, DOI: 10.1590/S0073-47212012000100012
Abstract: in order to evaluate the efficiency of different mammalian survey methods, we compared traditional sampling techniques (use of camera-traps on roads and artificial trails, track censuses, and direct field visualization) with an alternative sampling design (camera-traps positioned in natural areas such as natural trails and shelters). we conducted the study in a deciduous atlantic-forest park in southern brazil, and additionally compared our results with a previous intensive study carried out in the same area. our considerably smaller sampling effort (example: 336 trap.day for our camera-traps versus 2,154 trap.day for the earlier study) registered the presence of 85% of the local known species, with camera-traps being 68% efficient. moreover, shelter camera-traps revealed a different species composition regarding most of other sampling methods. this sampling strategy involving natural forest sites was therefore able to effectively optimize the chances of evaluating species composition in a shorter period, especially with respect to lower-density and cryptic species, as well as to detect species that avoid open, disturbed sites such as roads and man-made forest trails.
First record of the invasive alien species Axis axis (Erxleben, 1777) (Artiodactyla: Cervidae) in Brazil
Sponchiado, Jonas;Melo, Geruza Leal;Cáceres, Nilton Carlos;
Biota Neotropica , 2011, DOI: 10.1590/S1676-06032011000300032
Abstract: the exotic alien species axis axis was introduced in the americas at the beginning of last century and since then has established itself, expanding its distribution. this is the first record of this species in brazil. in the extreme south of the country, an individual of a. axis was recorded with a camera trap in the espinilho state park. the area is close to the border of uruguay and argentina, countries where the species is established and from where this individual presumably originated. the pampas biome is strongly disturbed by human activity in brazil and since many native mammal species such as the pampas deer ozotoceros bezoarticus are threatened regionally. it is alarming that exotic populations can potentially rapidly expand their ranges in the region, as a. axis deer has done in uruguay and argentina. possible consequences for this invasion are discussed.
Occurrence of Conepatus chinga (Molina) (Mammalia, Carnivora, Mustelidae) and other terrestrial mammals in the Serra do Mar, Paraná, Brazil
Cáceres, Nilton C.;
Revista Brasileira de Zoologia , 2004, DOI: 10.1590/S0101-81752004000300020
Abstract: in this paper 19 additional mammalian species are reported in the atlantic forest of the paranean serra do mar, southern brazil, including threatened and rare species. these findings resulted from a one-year field research in the western slope of the serra do mar, piraquara municipality, with additional review of reports about mammal distribution in the region. preliminarily mammal richness in the region is round 54 species, but this number could be higher with more systematic surveys, particularly with regards to bats. the occurrence of the hog-nosed skunk, conepatus chinga (molina, 1782), is reported for the first time in the eastern portion of paraná, a state vastly deforested during the last century in brazil.
Comparative lengths of digestive tracts of seven didelphid marsupials (Mammalia) in relation to diet
Cáceres, Nilton C.;
Revista Brasileira de Zoologia , 2005, DOI: 10.1590/S0101-81752005000100021
Abstract: the relative proportions of the digestive tract were rarely explored to understand the behaviour and the ecology of neotropical marsupials. in this study, proportions of the digestive tract and diet were compared in seven opossum species. the animals studied were didelphis albiventris lund, 1840, d. aurita wied-neuwied, 1826, metachirus nudicaudatus (desmarest, 1817), philander frenatus (olfers, 1818), lutreolina crassicaudata desmarest, 1804, monodelphis sorex (hensel, 1872) and caluromys lanatus (olfers, 1818). segments of digestive tracts of marsupials were measured and differences were statistically tested by analysis of variance and covariance. caecum and hard guts were responsible for the main differences among opossums, although all segments differed significantly. caluromys lanatus was the most specialised species, with a large hard gut and caecum, small stomach and shorter small gut. the large caecum of m. nudicaudatus and the shortest hard gut of m. sorex were also noticed. the arboreal c. lanatus has a well different feeding habit and life style regarding other marsupials studied, such as m. sorex and m. nudicaudatus which are terrestrial, corroborating the results reached.
Juego de intereses en la demolición del Convento y de la Iglesia de Santo Domingo. Bogotá, 1939-1947
Rueda Cáceres Liliana Rueda Cáceres
Anuario Colombiano de Historia Social y de la Cultura , 2012,
Abstract: La demolición del antiguo convento Santo Domingo, en abril de 1939, generó la fragmentación de la manzana urbana que había ocupado por más de trescientos a os. Qué consecuencias adicionales conllevó este fraccionamiento? El artículo se centra en el análisis de los movimientos de finca raíz que se dieron en la “nueva” manzana que apareció con la demolición de la Iglesia de Santo Domingo, siete a os después de haber sido derribado el convento; este hecho urbano evidenció la existencia de unos juegos de intereses. El marco teórico y metodológico para analizar este caso se basa en la historia urbana, la que observa a la ciudad como un producto social y en la que el plano se constituye en una herramienta de reflexión. Se concluye que el antiguo convento, más que un inconveniente para la “modernización” de la ciudad, era realmente un obstáculo para la densificación y rentabilidad de ese sector, que se había desarrollado anárquicamente y sin el debido control y regulación de las entidades a cargo.
Violencia en relaciones íntimas en dos etapas evolutivas
Adriana Cáceres,José Cáceres
International Journal of Clinical and Health Psychology , 2006,
Abstract: En este estudio descriptivo mediante encuestas se analiza la frecuencia y la intensidad de violencia física, psicológica y sexual de la que manifiestan haber sido objeto hombres y mujeres (n = 60) en el contexto de una relación íntima. Se estudiaron las respuestas de dos tipos de parejas, los que inician su relación ( novios , n = 30) y aquellos que llevan varios a os en el contexto de una relación conflictiva ( matrimonios , n = 30) a la Escala de Ajuste Diádico de Spanier y al índice de Violencia en Pareja de Hudson y McIntosh. Un 3,3% de los novios supera el punto cutt-off del cuestionario en violencia física y psicológica, mientras que el 43% de los matrimonios lo hace en el caso de la violencia física y un 50% en violencia psicológica. Ningún sujeto denunció haber sido forzado/a a realizar actos sexuales no deseados, mientras que un 6,7% de los hombres y un 3,3% de las mujeres denuncian ser requeridos/as sexualmente, aún estando cansados. No existen diferencias entre ambos géneros en ninguna de las puntuaciones. La correlación entre el índice de violencia y la Escala de Ajuste Diádico es de -0,72 (p <0,01). Se concluye que, además de otras medidas, se han de potenciar habilidades de relación democráticas para erradicar este problema.
La sustentabilidad de los sistemas campesinos analizada desde dos enfoques: Estados vs. Procesos
Cáceres,Daniel M;
Interciencia , 2008,
Abstract: currently, the debate on sustainability issues permeates almost every corner of the social field. however, researches aiming at making the concept more operational are not widespread, and most of the times their contributions stay within theoretical grounds. from a conceptual point of view, this paper discusses the convenience of approaching the concept of sustainability from two perspectives: "states" versus "processes". drawing upon an ad-hoc framework, three environmental and three socioeconomic indicators were created which were integrated in a farm sustainability index (fsi). the indicators were evaluated systematically during five consecutive years, aiming at assessing the sustainability of 14 peasant farms, located in central argentina. results show that in 57% of the farms there is a reduction on the fsi. these findings are analyzed in the light of the two perspectives mentioned above. it is argued that the "processes" approach may be more appropriate than the "states" approach to measure the sustainability of farming systems.
Agrobiodiversity and technology in resource-poor farms
Cáceres,Daniel M;
Interciencia , 2006,
Abstract: farms managed by peasants are traditionally considered as containing a high level of agrobiodiversity. however, the internal heterogeneity of their farming systems and the links between agrobiodiversity, technology and peasant livelihood strategies have been much less explored. in order to explore these relationships, a comparison was carried out between two groups of resource-poor farmers in northeastern argentina: agroecological farmers and tobacco growers. the results suggest that the high agrobiodiversity observed in these farms rests on four main diversification strategies: genetic, spatial, temporal, and management diversification. agrobiodiversity is also the result of the type of technologies used within these farms and the conditions in which the productive processes take place. despite the fact that both groups of farmers have a very similar farm structure, a shared technological matrix and the same fine-grain logic underlying their approach to farming, their farms showed markedly different levels of agrobiodiversity. agroecological farmers managed more than three times as many species as did tobacco growers. they also devoted significantly more species to self-consumption and self-input. the findings described here have implications for rural development and policymaking, since the embracement of different approaches to farming can produce largely different impacts on both peasant livelihoods and the environment.
EL DESPIDO NULO POR DEUDA PREVISIONAL: UN ESPERPENTO JURíDICO
Palavecino Cáceres,Claudio;
Ius et Praxis , 2002, DOI: 10.4067/S0718-00122002000200017
Abstract: this monograph states a critical analysis of the law no. 19.631 (of 1999), also called "ley bustos" in honor of its author the deceased representative and syndicate director d. manuel bustos huerta; the law, which established the null layoff because of social security debt. it is necessary to point out that these criticisms are presented in a judicial technical perspective and therefore, exclude the legislative political objective of said law 19.631, tending to create a judicial instrument that would prevent or difficult not paying the social security debts.
SURFACE FEATURES OF THE CIRCULATION IN FJORDS OF SOUTHERN CHILE OBSERVED IN ERS AND LANDSAT IMAGES
Cáceres,Mario;
Gayana (Concepción) , 2004, DOI: 10.4067/S0717-65382004000200014
Abstract: surface features of the hydrodynamics at the mouth of aysen fjord, in the chilean inland sea, were described using landsat and ers-sar images in combination with field data. a set of seventeen radar images from ers, along with one landsat (etm) were analyzed to study the surface features observed in this region, where fresh water input is an important contributor to the dynamics of the estuarine system. field data were provided by current measurements obtained with an acoustic doppler current profiler (adcp) mounted in a catamaran looking downward, which was towed from a boat during two semidiurnal cycles to obtain repetitions over two transverse transects. there were also density measurements obtained from ctd (conductivity, temperature and depth) vertical profiles in the water column and from a surface termosalinograph (conductivity, temperature) mounted onboard of a research vessel. the results of this campaign in aysen fjord were associated to the surface features observed in satellite images. the results show the main features of the circulation at the mouth of this fjord and other phenomena of interest for physical oceanography. noteworthy is a frontal structure suggested on both types of images. this feature is partially supported by adcp measurements and strongly suggested by density measurements. packages of internal waves in costa channel are also suggested in radar images, while the distribution of the fresh water plume is supported by the landsat image. satellite images provided valuable guidance to focus the research in a selected area and phenomena
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