Anaerobic ammonium oxidation in deep-sea sediments off the Washington margin

Pia Engström, Christopher Penton, Allan H. Devol

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

The significance of anaerobic ammonium oxidation (anammox) for nitrogen removal in deep continental margin sediments was studied with 15N amendments to suboxic sediments collected from 2800-3100-m water depth at eight sites in the Cascadia Basin (eastern North Pacific Ocean). Consistent with earlier data from deep continental margin sediments, pore-water distributions of inorganic N indicated NH 4 4 removal from suboxic zone sediments, likely due to reaction with nitrate. Anammox rates estimated from suboxic sediment incubations with 15N-labled substrates ranged between 0.065 and 1.7 nmol N mL -1 h -1 (wet sediment), which suggested that anammox was responsible for the observed NH + 4 removal. Anammox and denitrification rates derived from NH + 4 and NO - 4 pore-water profiles were 32-82 μmol N m -2 d -1 and 50-110 μmol N m -2 d -1, respectively. The average contribution of anammox to total N 2 production was 40% ( 15N-amended sediment incubations) to 42% (flux from pore-water inorganic N), which does not support earlier reports that suggested that the relative importance of anammox increased with water depth and thereby should dominate over denitrification at depths greater than 1000 m.

Original languageEnglish (US)
Pages (from-to)1643-1652
Number of pages10
JournalLimnology and Oceanography
Volume54
Issue number5
StatePublished - Sep 2009
Externally publishedYes

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deep-sea sediment
ammonium
oxidation
sediments
sediment
porewater
denitrification
continental margin
water depth
water
incubation
water distribution
anaerobic ammonium oxidation
Pacific Ocean
nitrates
basins
nitrate
substrate
nitrogen
basin

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Cite this

Anaerobic ammonium oxidation in deep-sea sediments off the Washington margin. / Engström, Pia; Penton, Christopher; Devol, Allan H.

In: Limnology and Oceanography, Vol. 54, No. 5, 09.2009, p. 1643-1652.

Research output: Contribution to journalArticle

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