Description: Das Projekt "Iron toxicity in Chlamydomonas in relation to P limitation" wird vom Umweltbundesamt gefördert und von Universität Potsdam, Institut für Biochemie und Biologie, Arbeitsgebiet Ökologie, Ökosystemmodellierung durchgeführt. The green flagellate algal species Chlamydomonas acidophila faces co-limiting conditions in a multi-stress environment. In this proposal, co-limiting conditions for inorganic P (Pi) and inorganic carbon (CO2) as well as survival in lakes with high iron concentrations (multi-stress) are the central topics.In the very acidic lakes, growth of C. acidophila is potentially limited by Pi and/or CO2. In ongoing laboratory experiments, a trade-off in the acquisition of either Pi or CO2 was revealed, that was more strongly related to the cellular P quota (Qp) than to the external nutrient concentration. This correlation enhanced our understanding of the dynamics of natural phytoplankton populations possibly co-limited for Pi and CO2. First data show a high tolerance for high iron concentrations on the growth and photosynthetic yield of C. acidophila, but also negative effects. For example, high extemal Fe concentrations resulted in a cellular Pi-limitation. Other results showed a negative correlation between enhanced cellular Fe accumulations and the chlorophyll content. In a 3rd year of the project GA401/12, I want to finalise the experimental work on a co-limitation, and study the physiological response (e.g. Fe accumulation and location, C, P and Fe cell quotas and photosynthesis) of C acidophila to different ambient P:Fe ratios with the aim to unravel mechanisms of iron tolerance and the impact of Fe accumulation on the ecophysiology of our model algal species.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Potsdam ? Ökophysiologie ? Seen ? Eisen ? Geißeltierchen ? Kohlenstoff ? Nährstoff ? Ökologie ? Phytoplankton ? Chlorophyll ? Hydrogeologie ? Photosynthese ? Stress ? Gelöster organischer Kohlenstoff ? Beschaffung ? Daten ? Hydrochemie ? Limnologie ? Ökosystemmodell ? Siedlungswasserwirtschaft ? Studie ? Toxizität ? Zelle ? Laborversuch ? Wirkungsmodell ? Anreicherung ? Arbeit ? Hydrologie ? Art [Spezies] ? Integrierte Wasser-Ressourcen Bewirtschaftung ? Konzentrat ?
Region: Brandenburg
Bounding box: 13.01582° .. 13.01582° x 52.45905° .. 52.45905°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2007-01-01 - 2011-12-31
Webseite zum Förderprojekt
https://gepris.dfg.de/gepris/projekt/50458766 (Webseite)Accessed 1 times.