Articles | Volume 18, issue 1
https://doi.org/10.5194/bg-18-327-2021
https://doi.org/10.5194/bg-18-327-2021
Research article
 | 
15 Jan 2021
Research article |  | 15 Jan 2021

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

Constance Choquel, Emmanuelle Geslin, Edouard Metzger, Helena L. Filipsson, Nils Risgaard-Petersen, Patrick Launeau, Manuel Giraud, Thierry Jauffrais, Bruno Jesus, and Aurélia Mouret

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Cited articles

Aller, R. C.: The Effects of Macrobenthos on Chemical Properties of Marine Sediment and Overlying Water, in: Animal-Sediment Relations, edited by: McCall, P. L. and Tevesz, M. J. S., Springer US, 53–102, 1982. 
Aller, R. C.: The sedimentary Mn cycle in Long Island Sound: Its role as intermediate oxidant and the influence of bioturbation, O2, and Corg flux on diagenetic reaction balances, J. Mar. Res., 52, 259–29, 1994. 
Aller, R. C., Hall, P. O. J., Rude, P. D., and Aller, J. Y.: Biogeochemical heterogeneity and suboxic diagenesis in hemipelagic sediments of the Panama Basin, Deep-Sea Res. Pt. I, 45, 133–165, 1998. 
Alve, E. and Goldstein, S. T.: Propagule transport as a key method of dispersal in benthic foraminifera (Protista), Limnol. Oceanogr., 48, 2163–2170, 2003. 
Andersen, K., Kjær, T., and Revsbech, N. P.: An oxygen insensitive microsensor for nitrous oxide, Sensor. Actuat. B-Chem., 42–48, 2001. 
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Short summary
Marine microorganisms such as foraminifera are able to live temporarily without oxygen in 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. The invasive species respire nitrate until 100 % of the nitrate porewater in the sediment and could be a major contributor to nitrogen balance in oxic coastal ecosystems. But prolonged hypoxia creates unfavorable conditions to survive.
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