SUBPROJECT - B2

 

Photoautotrophic responses to changes in nutrient stoichiometry

 

Nitrogen loss in OMZs through denitrification and anammox shifts nutrient stoichiometry to lower than Redfield proportions (N:P<16:1). The response of the autotrophic community to non-Redfield stoichiometry in terms of (1) N-replenishment through N₂-fixation, (2) primary production with lower than Redfield N:P, and (3) diversion of P into dissolved organic phosphoru are investigated in bioassay experiments and field surveys. Modelling studies build on these observations to examine links among nutrient stoichiometry, plankton production, N₂-fixation, and DOM dynamics with 0-dimensional models and their implementation into local (1D) and global (3D) frameworks.

 

 

Contact:
Prof. Ulf Riebesell                           Dr. Markus Pahlow
Tel.: +49 431 600 4444                   Tel.: +49 431 600 4027
uriebesell(a)geomar.de                   mpahlow(a)geomar.de