Statistical Analysis of Eco-Toxicologic Data of Mammals from a Polluted Area

Several eco-toxicological studies have shown that insectivorous mammals, due to their feeding 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°uence on 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 greater white-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 give misleading results. Therefore, to improve the interpretation of the data obtained, we used statistical techniques for compositional data analysis to define groups of metals and to evaluate the relationships between them, from an inter-population viewpoint. Hypothesis testing on the adequate balance-coordinates allow us to confirm intuition based hypothesis and some previous results. The main statistical goal was to test equal means 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

Patronat: Entrevista al Sr. Manel Xifra, president del Patronat de l'EPS

El 17 de novembre de 2006 el Ple del Patronat de l’Escola Politècnica Superior va elegir el Sr. Manel Xifra president, en substitució del Sr. David Marca, que havia presidit el Patronat els últims dos mandats. Hem volgut, doncs, en aquest primer número de la revista de l’EPS, iniciar aquest apartat amb una entrevista al Sr. Manel Xifra, perquè ens doni una visió de la realitat actual del Patronat de l’Escola Politècnica Superior i del seu futur