Anammox in Tidal Marsh Sediments: The Role of Salinity,Nitrogen Loading,and Marsh Vegetation |
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| Authors: | Ketil Koop-Jakobsen Anne E Giblin |
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| Institution: | (1) Boston University Marine Program, 675 Commonwealth Avenue, Room 141A, Boston, MA 02215, USA;(2) The Ecosystems Center, Marine Biological Laboratory, 7 MBL-street, Woods Hole, 02543, MA, USA |
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| Abstract: | 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 N2 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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