Carbon and nitrogen acquisition in shallow and deep holobionts of the scleractinian coral S. pistillata

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

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 clade A in shallow reefs and the other one associated with clade C in mesophotic reefs. The main findings are that: (1) clade C-symbionts have a competitive advantage for the acquisition of carbon at low irradiance compared to clade 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 clade 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 clade C, as this symbiont type is more efficient to fix carbon at low light.

Original languageAmerican English
Article number102
JournalFrontiers in Marine Science
Volume4
Issue numberAPR
DOIs
StatePublished - 13 Apr 2017

Bibliographical note

Publisher Copyright:
© 2017 Ezzat, Fine, Maguer, Grover and Ferrier-Pagès.

Keywords

  • Ammonium
  • Carbon isotopes
  • Clades
  • Light acclimation
  • Mesophotic coral
  • Nitrate
  • Nitrogen isotopes
  • Scleractinian coral

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