Stark contrast in denitrification and anammox across the deep Norwegian trench in the Skagerrak.

ABSTRACT: Environmental anaerobic ammonium oxidation (anammox) was demonstrated for the first time in 2002, using (15)N labeling, in homogenized sediment from the Skagerrak, where it accounted for up to 67% of N2 production. We returned to some of these original sites in 2010 to make measurements of nitrogen and carbon cycling under conditions more representative of those in situ, quantifying anammox and denitrification, together with oxygen penetration and consumption, in intact sediment cores. Overall, oxygen consumption and N2 production decayed with water depth, as expected, but the drop in N2 production was relatively more pronounced. Whereas we confirmed the dominance of N2 production by anammox (72% and 77%) at the two deepest sites (∼700 m of water), anammox was conspicuously absent from two

SUBMITTER: Trimmer M 

PROVIDER: S-EPMC3837768 | biostudies-literature | 2013 Dec

REPOSITORIES: biostudies-literature