993 resultados para SALUD PUBLICA - COLOMBIA - 2003-2008
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El trabajo se propone indagar acerca de la situación del mercado de trabajo en el Aglomerado Gran La Plata, focalizando la atención en la implementación de Programas de Empleo Transitorios, como herramienta de carácter netamente pasivo, utilizada por el Estado -sobre todo en las últimas décadas- para enfrentar los problemas de empleo de la población. A partir de la situación presentada para la región, se realizará una aproximación a la situación específica que presenta el municipio de Berisso, que forma parte del Aglomerado, con el interés de profundizar el análisis en las estrategias y formas de implementación efectiva de este tipo de políticas en el nivel municipal Para la realización del trabajo se utilizarán la información de la Encuesta Permanente de Hogares (EPH - INDEC), los datos brindados por el Municipio sobre el que profundizará parte del análisis y documentos sobre Políticas y Programas de Empleo.
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Inter-individual variation in diet within generalist animal populations is thought to be a widespread phenomenon but its potential causes are poorly known. Inter-individual variation can be amplified by the availability and use of allochthonous resources, i.e., resources coming from spatially distinct ecosystems. Using a wild population of arctic fox as a study model, we tested hypotheses that could explain variation in both population and individual isotopic niches, used here as proxy for the trophic niche. The arctic fox is an opportunistic forager, dwelling in terrestrial and marine environments characterized by strong spatial (arctic-nesting birds) and temporal (cyclic lemmings) fluctuations in resource abundance. First, we tested the hypothesis that generalist foraging habits, in association with temporal variation in prey accessibility, should induce temporal changes in isotopic niche width and diet. Second, we investigated whether within-population variation in the isotopic niche could be explained by individual characteristics (sex and breeding status) and environmental factors (spatiotemporal variation in prey availability). We addressed these questions using isotopic analysis and Bayesian mixing models in conjunction with linear mixed-effects models. We found that: i) arctic fox populations can simultaneously undergo short-term (i.e., within a few months) reduction in both isotopic niche width and inter-individual variability in isotopic ratios, ii) individual isotopic ratios were higher and more representative of a marine-based diet for non-breeding than breeding foxes early in spring, and iii) lemming population cycles did not appear to directly influence the diet of individual foxes after taking their breeding status into account. However, lemming abundance was correlated to proportion of breeding foxes, and could thus indirectly affect the diet at the population scale.
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Tit. tomado del texto
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Tesis doctoral Univ. Central, 1867?
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Tesis doctoral Univ. Central, 1865.
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Tesis doctoral Univ. Central, 1860.
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Tesis doctoral Univ. Central, 1863.
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Palau 117.406.
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Tesis doctoral Univ. Central, 1856.
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Tesis Universidad Central.