Description: Das Projekt "Novel technologies to reveal the impacts of nutrient limitation in aquatic systems: from biodiversity to biogeochemical cycles" wird vom Umweltbundesamt gefördert und von Universite de Geneve, Institut F.-A. Forel durchgeführt. Both lakes and oceans are important for the global carbon cycle and thus the regulation of climate processes. Due to climate change and human activities, aquatic systems are subject to increasing pressure with changes already observed at multiple levels affecting their functioning. It is therefore urgent to understand the dynamic of aquatic systems, if one wants to predict their response to changing conditions. Phytoplankton, act as engineers, initiating the incorporation of terrestrial and atmospheric compounds into the food chain and driving their biogeochemical cycling. They not only respond rapidly to their environment, they also profoundly alter aquatic chemistry, affecting the reactivity, recycling, remineralisation and therefore fate of many elements. As such, phytoplankton affect the dynamics of aquatic systems with effects at both local and global scales. Phytoplankton can thus be used as sentinel to assess the dynamics and changes in aquatic systems. One of the most prominent reported controls of phytoplankton biomass, biodiversity and productivity is nutrient limitation, reported in most of the ocean and numerous lakes. Iron (Fe), nitrogen (N) and phosphorous (P) are the main limiting nutrients in aquatic systems. Nutrient limitation affects the functioning of aquatic systems and their contribution to the global carbon cycle. Despite numerous studies, the parameters controlling nutrient limitation and their accessibility to phytoplankton (viz. bioavailability) remain largely unknown. The aim of this project is to identify nutrient (Fe, N, P) limitation in different aquatic systems, and to improve our understanding of aquatic biogeochemistry - from gene expression, chemistry and bioavailability through to the impact on biodiversity under current and future conditions. The study regions include the largest lake in Western Europe, Lake Geneva; the Southern Ocean, a pivotal region for the global carbon cycle; and the Tasman Sea, one of the most sensitive regions to predicted climate change. All these regions are associated with significant socio-economical value. Here, a rigorous multi-disciplinary laboratory and field approach will be used to provide complementary data sets to shed light on how nutrients affect the biodiversity, the biogeochemical cycles of key elements and the functioning of natural systems. The laboratory approach (1) explore the mechanisms controlling nutrient biological accessibility using relevant axenic phytoplankton cultures and (2) allows the calibration and validation of biological and chemical sensors to rapidly monitor nutrient limitation in aquatic systems. In addition, field work will (1) explore the link and the seasonality between important physical, biological and chemical parameters and (2) use perturbation experiments to investigate the complexity of the link between nutrients and natural planktonic assemblages. (...)
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Recycling ? Biopharmazeutikum ? Phosphat ? Nitrat ? Seen ? Eisen ? Biogeochemie ? Genf ? Genf ? Biosensor ? Beleuchtung ? Kalibrierung ? Nährstoff ? Phosphor ? Phytoplankton ? Sensor ? Skigebiet ? Stickstoff ? Main ? Licht ? Regulierung ? Wirkung ? Westeuropa ? Kohlenstoffkreislauf ? Marine Biodiversität ? Ackerland ? Bioverfügbarkeit ? Chemikalien ? Kontrollmaßnahme ? Kreislaufsystem ? Mensch ? Studie ? Technik ? Meeresgewässer ? Wirkung ? Arbeit ? Ballungsraum ? Forschungseinrichtung ? Kenngröße ? Klima ? Klimawandel ? Lebensmittel ? Nahrungskette ? Produktivität ? Umwelt ? Verfahrensvorschrift ? Gebiet ? Globale Aspekte ? Biodiversität ? Südlicher Ozean ? EIN ? VERBINDUNG ? BEITRAG ? EINGESCHRAENKT ? EINSATZ ? Betriebsvorschrift ? EXPERIMENT ? FUNKTION ? GEBRAUCHT ? Genexpression ? INGENIEURWESEN ? limitation ? VERBLEIB ? VERHAELTNIS ? Aquatische Biomasse ? Inkorporation ? KONTROLLE ? MECHANISMEN ? Muskelarbeit ? Vermehrung ? BEWERTEN ? WERT ? DATENSATZ ? WICHTIG ? NEU ? PROJEKT ? RATIFIKATION ? See [Binnengewässer] ? THEMA ? UNTER ? DRUCK ? biogeochemical cycle ? VERANTWORTUNG ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2013-01-01 - 2016-12-31
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