Nitrogen fixation in the mucus of Red Sea corals

Renaud Grover*, Christine Ferrier-Pagès, Jean François Maguer, Leila Ezzat, Maoz Fine

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Scleractinian corals are essential constituents of tropical reef ecological diversity. They live in close association with diazotrophs [dinitrogen (N2)-fixing microbes], which can fix high rates of N2. Whether corals benefit from this extrinsic nitrogen source is still under debate. Until now, N2 fixation rates have been indirectly estimated using the acetylene reduction assay, which does not permit assessment of the amount of nitrogen incorporated into the different compartments of the coral holobiont. In the present study, the 15N2 technique was applied for the first time on three Red Sea coral species. Significant 15N enrichment was measured in particles released by corals to the surrounding seawater. N2 fixation rates were species specific and as high as 1.6-2 ng N day-1 l-1. However, no significant enrichment was measured in the symbiotic dinoflagellates or the coral host tissues, suggesting that corals do not benefit from diazotrophic N2 fixation.

Original languageAmerican English
Pages (from-to)3962-3963
Number of pages2
JournalJournal of Experimental Biology
Issue number22
StatePublished - 1 Nov 2014

Bibliographical note

Publisher Copyright:
© 2014. Published by The Company of Biologists Ltd.


  • Diazotrophy
  • Scleractinia
  • Stable isotopes
  • Symbiosis


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