Program and Agenda

Abstract

BIOGEOCHEMICAL CONTROLS ON THE MARINE NITROGEN CYCLE IN THE OXYGEN MINIMUM ZONE OFF PERU

Oxygen minimum zone (OMZ) waters play a crucial role in regulating the availability of nitrogen (N) containing nutrients and are a main site of nitrous oxide (N2O) formation in the Ocean. However, there are still many open questions regarding the effects of oxygen (O2) concentrations on nutrient regeneration, N loss, N2O production and N2 fixation processes in oxygen deficient waters. Here, we present rates of N2 fixation, nutrient regeneration and N2O production at in situ O2 concentrations. Key microorganisms involved were identified and quantified using a metagenomic approach. We could identify specific microbial habitats within and connected to OMZ waters. Those habitats are largely defined by nitrite and ammonia and sustain specific niches for different N-cycle processes and the corresponding key organisms. Thus, our study provides insights into spatial coupling of N-loss and N2 fixation and identifies hotspots of N2O production in OMZ waters. Our results enhance the understanding of the impact of low-oxygen conditions on the nitrogen cycle and its potential future changes.

Authors

Löscher, C. R., Kiel Uninversity, Germany, cloescher@geomar.de

Schunck, H., Kiel University, Germany, hschunck@geomar.de

Neulinger, S. C., Kiel University, Germany, sneulinger@ifam.uni-kiel.de

Bange, H. W., GEOMAR, Germany, hbange@geomar.de

Schmitz, R. A., Kiel University, Germany, rschmitz@ifam.uni-kiel.de

Details

Oral presentation

Session #:111
Date: 2/25/2014
Time: 14:15
Location: 313 A

Presentation is given by student: No