491 resultados para Pujol


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Calcareous microfossils are widely used by paleoceanographers to investigate past sea-surface hydrology. Among these microfossils, planktonic foraminifera are probably the most extensively used tool (e.g. [1] for a review), as they are easy to extract from the sediment and can also be used for coupled geochemical (e.g; d18O, d13C, Mg/Ca) and paleo-ecological investigations. Planktonic foraminifera are marine protists, which build a calcareous shell made of several chambers which reflect in their chemistry the properties of the ambient water-masses. Planktonic foraminifera are known to thrive in various habitats, distributed not only along a latitudinal gradient, but also along different water-depth intervals within surface waters (0-1000 m). Regarding their biogeographical distribution, planktonic foraminifera assemblages therefore mirror different water-masses properties, such as temperature, salinity and nutrient content of the surface water in which they live. The investigation of the specific composition of a fossil assemblage (relative abundances) is therefore a way to empirically obtain (paleo)information on past variations of sea-surface hydrological parameters. This paper focuses on the planktonic foraminifera record from the Arctic domain. This polar region records peculiar sea-surface conditions, with the influence of nearly perennial sea-ice cover development. This has strong impact on living foraminifera populations and on the preservation of their shells in the underlying sediments.

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The prefaces, biographical introductions, analytical notes and bibliographies are in Spanish and French.

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Vol. 10 includes discourses and tributes to the memory of Pujol, with biographical data.

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Primera série.

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From the ballet "El amor brujo."

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Otros pies de imp.: Imp. de Manuel A. Caloto, Imp. de Soto Freire.

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Mode of access: Internet.

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Tesis de la Universidad Central (Madrid), Facultad de Derecho, leída el 19-06-1860.

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Tesis de la Universidad Central (Madrid), Facultad de Derecho, leída el 23-05-1855.