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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-287
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-287
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  05 Aug 2020

05 Aug 2020

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A revised version of this preprint is currently under review for the journal BG.

Total nitrate uptake by an invasive benthic foraminifer in marine sediments

Constance Choquel1, Emmanuelle Geslin1, Edouard Metzger1, Helena L. Filipsson2, Nils Risgaard-Petersen3, Patrick Launeau1, Manuel Giraud1, Thierry Jauffrais4,1, Bruno Jesus5,6, and Aurélia Mouret1 Constance Choquel et al.
  • 1UMR 6112 LPG BIAF, Univ. Angers, Univ. Nantes, CNRS, France
  • 2Department of Geology, Lund University, Sweden
  • 3Department of Geosciences, Aarhus University, Denmark
  • 4Ifremer, IRD, Univ. Nouvelle‐Calédonie, Univ. La Réunion, CNRS, UMR 9220 ENTROPIE, New Caledonia
  • 5Université de Nantes, Mer Molécules Santé, EA 2160, France
  • 6BioISI – Biosystems & Integrative Sciences Institute, Campo Grande, University of Lisbon, Faculty of Sciences, Portugal

Abstract. 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.

Constance Choquel et al.

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Constance Choquel et al.

Constance Choquel et al.

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Latest update: 26 Nov 2020
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Short summary
Marine microorganisms as foraminifera are able to live temporarily without oxygen in the sediments. In a Swedish fjord subjected to seasonal oxygen scarcity, a change in fauna linked to the decrease in oxygen and the increase in an invasive species was shown. This invasive species respire nitrate until 100 % of the nitrate porewater in the sediment and could be a major contributor of nitrogen balance in oxic coastal ecosystems. Whereas prolonged hypoxia creates unfavorable conditions to survive.
Marine microorganisms as foraminifera are able to live temporarily without oxygen in the...
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