1000 resultados para RESTREPO RIVERA, JOSÉ ALEJANDRO, 1886-1958
Resumo:
Donateur : Pouchet, H. Ch. Georges (1833-1894)
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Donateur : Fouqué, Ferdinand (1828-1904)
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Donateur : Clermont, Raoul de (18..-19..?)
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Donateur : Reclus, Élisée (1830-1905)
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Donateur : Reclus, Élisée (1830-1905)
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Donateur : Reclus, Élisée (1830-1905)
Resumo:
Donateur : Clermont, Raoul de (18..-19..?)
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Several eco-toxicological studies have shown that insectivorous mammals, due to theirfeeding habits, easily accumulate high amounts of pollutants in relation to other mammal species. To assess the bio-accumulation levels of toxic metals and their in°uenceon essential metals, we quantified the concentration of 19 elements (Ca, K, Fe, B, P,S, Na, Al, Zn, Ba, Rb, Sr, Cu, Mn, Hg, Cd, Mo, Cr and Pb) in bones of 105 greaterwhite-toothed shrews (Crocidura russula) from a polluted (Ebro Delta) and a control(Medas Islands) area. Since chemical contents of a bio-indicator are mainly compositional data, conventional statistical analyses currently used in eco-toxicology can givemisleading results. Therefore, to improve the interpretation of the data obtained, weused statistical techniques for compositional data analysis to define groups of metalsand to evaluate the relationships between them, from an inter-population viewpoint.Hypothesis testing on the adequate balance-coordinates allow us to confirm intuitionbased hypothesis and some previous results. The main statistical goal was to test equalmeans of balance-coordinates for the two defined populations. After checking normality,one-way ANOVA or Mann-Whitney tests were carried out for the inter-group balances