Objectif Recent advances in biogeochemistry (biomarker analyses, compound-specific carbon isotope analyses of lipids) and microbiological techniques (FISH, DNA sequencing) have been very successfully employed in deciphering formation and/or transformation processes of organic material in the ocean. In contrast to the marine environment, the contribution of terrestrial ecosystems to the global carbon budget and the concentration of greenhouse gases (carbon dioxide, methane) in the atmosphere are only scarcely known. Terrestrial aquatic ecosystems participate in biogeochemical cycling of carbon species and act as carbon sinks or sources in response to environmental parameters. In this study, we will analyse particulate organic matter from different levels of the water column and on the underlying sediments from a eutrophic (Lake Lugano) and from an oligotrophic lake (Lake Thun, Switzerland). Lipids as markers specific for phytoplankton groups, land plants, bacteria, and archae will be quantified in the extractable organic matter and analysed for their carbon isotopic composition.The project will also include analyses of water chemistry, isotopic composition of dissolved inorganic carbon species, total organic carbon and sedimentary carbonates. The differences in the net carbon fluxes and isotopic fractionation processes within an oligotrophic lake and a eutrophic limnic environment will be outlined. Information about the environmental parameters affecting the carbon cycles within the water column and their influence o n the net carbon fluxes of the lakes are expected from the proposed research. Champ scientifique sciences naturellessciences de la Terre et sciences connexes de l'environnementgéologiesédimentologiesciences naturellessciences biologiquesmicrobiologiebactériologiesciences naturellessciences biologiquesbiochimiebiomoléculelipidessciences naturellessciences de la Terre et sciences connexes de l'environnementhydrologielimnologiesciences naturellessciences de la Terre et sciences connexes de l'environnementgéochimiebiogéochimie Programme(s) FP6-MOBILITY - Human resources and Mobility in the specific programme for research, technological development and demonstration "Structuring the European Research Area" under the Sixth Framework Programme 2002-2006 Thème(s) MOBILITY-2.1 - Marie Curie Intra-European Fellowships (EIF) Appel à propositions FP6-2005-MOBILITY-5 Voir d’autres projets de cet appel Régime de financement EIF - Marie Curie actions-Intra-European Fellowships Coordinateur EIDGENOSSISCHE ANSTALT FUR WASSERVERSORGUNG,ABWASSERREINIGUNG UND GEWÄSSERSCHUTZ Adresse Ueberlandstrasse 133 Duebendorf Suisse Voir sur la carte Liens Site web Opens in new window Contribution de l’UE Aucune donnée
