Carbon and Nitrogen Acquisition in Shallow and Deep Holobionts of the Scleractinian Coral S. pistillata

Type Article
Date 2017
Language English
Author(s) Ezzat Leila1, Fine MaozORCID2, 3, Maguer Jean-Francois4, Grover Renaud1, Ferrier-Pages Christine1
Affiliation(s) 1 : Marine Department, Scientific Centre of Monaco, Monaco, Monaco
2 : The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel
3 : The Interuniversity Institute for Marine Sciences, Eilat, Israel
4 : Laboratoire de l'Environnement Marin, UMR 6539, UBO/Centre Nationnal de la Recherche Scientifique/IRD/IFREMER, Institut Universitaire Européen de la Mer, Plouzané, France
Source Frontiers In Marine Science (2296-7745), 2017 , Vol. 4 , N. 102 , P. 12p.
DOI 10.3389/fmars.2017.00102
WOS© Times Cited 36
Keyword(s) light acclimation, carbon isotopes, nitrogen isotopes, clades, nitrate, ammonium, scleractinian coral, mesophotic coral

Reef building corals can host different symbiont genotypes (clades), and form distinct holobionts in response to environmental changes. Studies on the functional significance of genetically different symbionts have focused on the thermal tolerance rather than on the nutritional significance. Here, we characterized the nitrogen and carbon assimilation rates, the allocation patterns of these nutrients within the symbiosis, and the trophic condition of two distinct holobionts of Stylophora pistillata: one associated with Symbiodinium Glade A in shallow reefs and the other one associated with Glade C in mesophotic reefs. The main findings are that: (1) Glade C-symbionts have a competitive advantage for the acquisition of carbon at low irradiance compared to Glade A-symbionts: (2) light is however the primary factor that determines the positive relationship between the amount of carbon fixed in photosynthesis by the symbionts and the amount of carbon translocated to the host; and (3) by contrast, the dominant Symbiodinium type preferentially determines a negative relationship between rates of coral feeding and nitrogen assimilation, although light still plays a relevant role in this relationship. Clade C-holobionts had indeed higher heterotrophic capacities, but lower inorganic nitrogen assimilation rates than clade A-holobionts, at all light levels. Broadly, our results show that the assimilation and translocation rates of inorganic carbon and nitrogen are Glade and light -dependent. In addition, the capacity of S. pistillata to form mesophotic reefs in the Red Sea relies on its ability to select Symbiodinium Glade C, as this symbiont type is more efficient to fix carbon at low light.

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