Denitrification by benthic foraminifera and their contribution to N-loss from a fjord environment

Type Article
Date 2021-01
Language English
Author(s) Choquel Constance1, Geslin Emmanuelle1, Metzger Edouard1, Filipsson Helena L.2, Risgaard-Petersen Nils3, Launeau Patrick1, Giraud Manuel1, Jauffrais ThierryORCID1, 4, Jesus Bruno5, 6, Mouret Aurélia1
Affiliation(s) 1 : UMR 6112 LPG BIAF, Univ. Angers, Univ. Nantes, CNRS, France
2 : Department of Geology, Lund University, Sweden
3 : Department of Geosciences, Aarhus University, Denmark
4 : Ifremer, IRD, Univ. Nouvelle‐Calédonie, Univ. La Réunion, CNRS, UMR 9220 ENTROPIE, New Caledonia
5 : Université de Nantes, Mer Molécules Santé, EA 2160, France
6 : BioISI – Biosystems & Integrative Sciences Institute, Campo Grande, University of Lisbon, Faculty of Sciences, Portugal
Source Biogeosciences (1726-4170) (Copernicus GmbH), 2021-01 , Vol. 18 , N. 1 , P. 327-341
DOI 10.5194/bg-18-327-2021
WOS© Times Cited 14

Oxygen availability impacts the marine nitrogen cycle at a range of spatial and temporal scales. Invasive organisms have shown to sustainably affect sediment geochemistry and benthic ecology. Nonionella sp. T1 was recently described as an invasive benthic foraminifer in the North Sea region. Here, we demonstrate the impact of this denitrifying species on the foraminifera fauna and the nitrogen cycle of the Gullmar Fjord (Sweden). The foraminifera contribution to benthic denitrification was estimated by coupling living foraminifera micro-distribution, denitrification rate measurement and sedimentary nitrate 2D distribution. Nonionella sp. T1 dominated the foraminifera fauna and could denitrify up to 50–100 % of nitrate porewater in oxygenated bottom waters of the fjord. Contrastingly, at the deepest hypoxic low-nitrate station, denitrifying foraminifera species were scarce and did not contribute to nitrogen removal (~ 5 %). Our study showed that benthic foraminifera can be a major contributor of nitrogen mitigation in oxic coastal ecosystems and should be included in ecological and diagenetic models aiming at understanding biogeochemical cycles coupled to nitrogen.

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Choquel Constance, Geslin Emmanuelle, Metzger Edouard, Filipsson Helena L., Risgaard-Petersen Nils, Launeau Patrick, Giraud Manuel, Jauffrais Thierry, Jesus Bruno, Mouret Aurélia (2021). Denitrification by benthic foraminifera and their contribution to N-loss from a fjord environment. Biogeosciences, 18(1), 327-341. Publisher's official version : , Open Access version :