Skip to Main content Skip to Navigation
Journal articles

Nitrogen-limited mangrove ecosystems conserve N through dissimilatory nitrate reduction to ammonium

Abstract : Earlier observations in mangrove sediments of Goa, India have shown denitrification to be a major pathway for N loss(1). However, percentage of total nitrate transformed through complete denitrification accounted for <0-72% of the pore water nitrate reduced. Here, we show that up to 99% of nitrate removal in mangrove sediments is routed through dissimilatory nitrate reduction to ammonium (DNRA). The DNRA process was 2x higher at the relatively pristine site Tuvem compared to the anthropogenically-influenced Divar mangrove ecosystem. In systems receiving low extraneous nutrient inputs, this mechanism effectively conserves and re-circulates N minimizing nutrient loss that would otherwise occur through denitrification. In a global context, the occurrence of DNRA in mangroves has important implications for maintaining N levels and sustaining ecosystem productivity. For the first time, this study also highlights the significance of DNRA in buffering the climate by modulating the production of the greenhouse gas nitrous oxide.
Document type :
Journal articles
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-00714213
Contributor : Thierry Pin <>
Submitted on : Friday, November 20, 2020 - 4:29:34 PM
Last modification on : Friday, January 15, 2021 - 3:29:47 AM

File

srep00419-1.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution - NoDerivatives 4.0 International License

Identifiers

Citation

Sheryl Fernandes, Patricia Bonin, Valerie Michotey, Nicole Garcia, P. A. Lokabharathi. Nitrogen-limited mangrove ecosystems conserve N through dissimilatory nitrate reduction to ammonium. Scientific Reports, Nature Publishing Group, 2012, 2, pp.419. ⟨10.1038/srep00419⟩. ⟨hal-00714213⟩

Share

Metrics

Record views

336

Files downloads

66