Journal
ESTUARIES AND COASTS
Volume 32, Issue 2, Pages 238-245Publisher
SPRINGER
DOI: 10.1007/s12237-008-9131-y
Keywords
Anammox; Denitrification; Salt marsh; Nitrogen cycling
Funding
- National Science Foundation [NSF-OCE-9726921, NSF-OCE-0423565, NSF DEB 0213767]
- NOAA
- Department of Commerce [NA16RG2273]
- Woods Hole Oceanographic Institutions [R/M-50, R/M-53]
- Division Of Ocean Sciences
- Directorate For Geosciences [1058747, GRANTS:13970837] Funding Source: National Science Foundation
- Div Of Biological Infrastructure
- Direct For Biological Sciences [0816963, GRANTS:13760165] Funding Source: National Science Foundation
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Anammox bacteria are widespread in the marine environment, but studies of anammox in marshes and other wetlands are still scarce. In this study, the role of anammox in nitrogen removal from marsh sediments was surveyed in four vegetation types characteristic of New England marshes and in unvegetated tidal creeks. The sites spanned a salinity gradient from 0 to 20 psu. The impact of nitrogen loading on the role of anammox in marsh sediments was studied in a marsh fertilization experiment and in marshes with high nitrogen loading entering through ground water. In all locations, nitrogen removal through anammox was low compared to denitrification, with anammox accounting for less than 3% of the total N-2 production. The highest relative importance of anammox was found in the sediments of freshwater-dominated marshes, where anammox approached 3%, whereas anammox was of lesser importance in saline marsh sediments. Increased nitrogen loading, in the form of nitrate from natural or artificial sources, did not impact the relative importance of anammox, which remained low in all the nitrogen enriched locations (< 1%).
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