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Applied and Environmental Microbiology, October 2005, p. 6142-6149, Vol. 71, No. 10
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.10.6142-6149.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Correlation between Anammox Activity and Microscale Distribution of Nitrite in a Subtropical Mangrove Sediment

Rikke Louise Meyer,1* Nils Risgaard-Petersen,2 and Diane Elizabeth Allen3

Advanced Wastewater Management Centre,1 Department of Botany, The University of Queensland, St. Lucia, Queensland 4072, Australia,3 National Environmental Research Institute, Department of Marine Ecology, Vejlsøvej 25, DK-8600 Silkeborg, Denmark2

Received 22 January 2005/ Accepted 10 May 2005

The distribution of anaerobic ammonium oxidation (anammox) in nature has been addressed by only a few environmental studies, and our understanding of how anammox bacteria compete for substrates in natural environments is therefore limited. In this study, we measure the potential anammox rates in sediment from four locations in a subtropical tidal river system. Porewater profiles of NOx– (NO2– plus NO3–) and NO2– were measured with microscale biosensors, and the availability of NO2– was compared with the potential for anammox activity. The potential rate of anammox increased with increasing distance from the mouth of the river and correlated strongly with the production of nitrite in the sediment and with the average concentration or total pool of nitrite in the suboxic sediment layer. Nitrite accumulated both from nitrification and from NOx– reduction, though NOx– reduction was shown to have the greatest impact on the availability of nitrite in the suboxic sediment layer. This finding suggests that denitrification, though using NO2– as a substrate, also provides a substrate for the anammox process, which has been suggested in previous studies where microscale NO2– profiles were not measured.

* Corresponding author. Mailing address: Advanced Wastewater Management Centre, The University of Queensland, St. Lucia, QLD 4072, Australia. Phone: 61 7 3346 9021. Fax: 61 7 3365 4726. E-mail: rikke.meyer{at}awmc.uq.edu.au.

Applied and Environmental Microbiology, October 2005, p. 6142-6149, Vol. 71, No. 10
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.10.6142-6149.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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