Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces
For decades, the conversion of organic nitrogen to dinitrogen gas by heterotrophic bacteria, termed heterotrophic denitrification, was assumed to be the main pathway of nitrogen loss in natural ecosystems. Recently, however, autotrophic bacteria have been shown to oxidize ammonium in the absence of...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
Nature Publishing Group, Macmillan Publishers Ltd
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/52584 |
| _version_ | 1848758962621513728 |
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| author | Zhu, G. Wang, S. Wang, W. Wang, Y. Zhou, L. Jiang, B. Op Den Camp, H. Risgaard-Petersen, N. Schwark, Lorenz Peng, Y. Hefting, M. Jetten, M. Yin, C. |
| author_facet | Zhu, G. Wang, S. Wang, W. Wang, Y. Zhou, L. Jiang, B. Op Den Camp, H. Risgaard-Petersen, N. Schwark, Lorenz Peng, Y. Hefting, M. Jetten, M. Yin, C. |
| author_sort | Zhu, G. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | For decades, the conversion of organic nitrogen to dinitrogen gas by heterotrophic bacteria, termed heterotrophic denitrification, was assumed to be the main pathway of nitrogen loss in natural ecosystems. Recently, however, autotrophic bacteria have been shown to oxidize ammonium in the absence of oxygen, yielding dinitrogen gas. This process, termed anammox, accounts for over 50% of nitrogen loss in marine ecosystems. However, the significance of anammox in freshwater ecosystems has remained uncertain. Here, we report the occurrence of anammox hotspots at land-freshwater interfaces of lake riparian zones in North China, using molecular and isotopic tracing technologies. Laboratory incubations measuring anammox activity at substrate concentrations no more than 10% of those observed in situ yielded some of the highest potential activities reported for natural environments to date. Potential rates of anammox peaked in sediments sampled from the interface between land and water, as did the abundance of annamox bacteria. Scaling our findings up to the entire lake system, we estimate that interfacial anammox hotspots account for the loss of 103 g Nm-2 yr-1 from this lake region, and around one fifth of the nitrogen lost from the land-water interface. © 2013 Macmillan Publishers Limited. All rights reserved. |
| first_indexed | 2025-11-14T09:52:19Z |
| format | Journal Article |
| id | curtin-20.500.11937-52584 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:52:19Z |
| publishDate | 2013 |
| publisher | Nature Publishing Group, Macmillan Publishers Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-525842017-09-13T15:40:02Z Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces Zhu, G. Wang, S. Wang, W. Wang, Y. Zhou, L. Jiang, B. Op Den Camp, H. Risgaard-Petersen, N. Schwark, Lorenz Peng, Y. Hefting, M. Jetten, M. Yin, C. For decades, the conversion of organic nitrogen to dinitrogen gas by heterotrophic bacteria, termed heterotrophic denitrification, was assumed to be the main pathway of nitrogen loss in natural ecosystems. Recently, however, autotrophic bacteria have been shown to oxidize ammonium in the absence of oxygen, yielding dinitrogen gas. This process, termed anammox, accounts for over 50% of nitrogen loss in marine ecosystems. However, the significance of anammox in freshwater ecosystems has remained uncertain. Here, we report the occurrence of anammox hotspots at land-freshwater interfaces of lake riparian zones in North China, using molecular and isotopic tracing technologies. Laboratory incubations measuring anammox activity at substrate concentrations no more than 10% of those observed in situ yielded some of the highest potential activities reported for natural environments to date. Potential rates of anammox peaked in sediments sampled from the interface between land and water, as did the abundance of annamox bacteria. Scaling our findings up to the entire lake system, we estimate that interfacial anammox hotspots account for the loss of 103 g Nm-2 yr-1 from this lake region, and around one fifth of the nitrogen lost from the land-water interface. © 2013 Macmillan Publishers Limited. All rights reserved. 2013 Journal Article http://hdl.handle.net/20.500.11937/52584 10.1038/ngeo1683 Nature Publishing Group, Macmillan Publishers Ltd restricted |
| spellingShingle | Zhu, G. Wang, S. Wang, W. Wang, Y. Zhou, L. Jiang, B. Op Den Camp, H. Risgaard-Petersen, N. Schwark, Lorenz Peng, Y. Hefting, M. Jetten, M. Yin, C. Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces |
| title | Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces |
| title_full | Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces |
| title_fullStr | Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces |
| title_full_unstemmed | Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces |
| title_short | Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces |
| title_sort | hotspots of anaerobic ammonium oxidation at land-freshwater interfaces |
| url | http://hdl.handle.net/20.500.11937/52584 |