Description: Das Projekt "The influence of Fe on the distribution and kinetic speciation of Zn, Cd, Co and Ni in the Southern Ocean" wird vom Umweltbundesamt gefördert und von Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR), Forschungsbereich 2: Marine Biogeochemie, Forschungseinheit Chemische Ozeanographie durchgeführt. The role of Fe as the key limiting nutrient for the growth of phytoplankton in the high-nitrate-low-chlorophyll (HNLC) waters of the Southern Ocean is now without question after a series of mesoscale Fe enrichment experiments conducted there over the last few years. Through its influence on phytoplankton physiology changes in Fe have an effect on the biological demand and the distribution of other nutrients. Some of the other key bio-elements have the potential to co-limit the growth of plankton species and in turn influence the phytoplankton community structure and the drawdown of macronutrients. In this context the trace metals Zn, Cd, Co and Ni are needed for the uptake and metabolisation of the macronutrients N, Si, C and P (Figure 1) and have been identified as prime candidates for further studies. While Zn, Co and Ni are important cofactors in various enzymes the role of Cd is ambivalent as it is toxic in relatively low concentrations. However recently it could be shown that a variety of marine diatoms have the ability to use Cd as a substitute for Zn in isoforms of the Carbonic Anhydrase. Furthermore a deepened knowledge regarding the biogeochemistry of Zn and Cd is fundamental to establish their use as paleo-tracers for carbon-export (Zn) and primary productivity (Cd).
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Biopharmazeutikum ? Kobalt ? Nickel ? Eisen ? Biogeochemie ? Zink ? Cadmium ? Diatomeen ? Geochemie ? Nährstoff ? Phosphor ? Physiologie ? Phytoplankton ? Silizium ? Stickstoff ? Tracer ? Biochemie ? Chlorophyll ? Enzym ? Meereskunde ? Plankton ? Metall ? Meereschemie ? Gelöster organischer Kohlenstoff ? Nährstoffkreislauf ? Studie ? Toxizität ? Meeresgewässer ? Bewässerung ? Produktivität ? Stoffwechsel ? Gewässer ? Anreicherung ? Südlicher Ozean ? Primärproduktion ? Speziation [Chemie] ? Wachstum [biologisch] ? Art [Spezies] ?
Region: Schleswig-Holstein
Bounding boxes: 9.75° .. 9.75° x 54.2° .. 54.2°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2007-07-01 - 2009-06-30
Webseite zum Förderprojekt
http://www.spp-antarktisforschung.de/ (Webseite)Accessed 1 times.