Coral Reefs

, 28:405

Juvenile corals can acquire more carbon from high-performance algal symbionts

  • N. E. Cantin
  • M. J. H. van Oppen
  • B. L. Willis
  • J. C. Mieog
  • A. P. Negri
Report

DOI: 10.1007/s00338-009-0478-8

Cite this article as:
Cantin, N.E., van Oppen, M.J.H., Willis, B.L. et al. Coral Reefs (2009) 28: 405. doi:10.1007/s00338-009-0478-8

Abstract

Algal endosymbionts of the genus Symbiodinium play a key role in the nutrition of reef building corals and strongly affect the thermal tolerance and growth rate of the animal host. This study reports that 14C photosynthate incorporation into juvenile coral tissues was doubled in Acropora millepora harbouring Symbiodinium C1 compared with juveniles from common parentage harbouring Symbiodinium D in a laboratory experiment. Rapid light curves performed on the same corals revealed that the relative electron transport rate of photosystem II (rETRMAX) was 87% greater in Symbiodinium C1 than in Symbiodinium D in hospite. The greater relative electron transport through photosystem II of Symbiodinium C1 is positively correlated with increased carbon delivery to the host under the applied experimental conditions (r2 = 0.91). This may translate into a competitive advantage for juveniles harbouring Symbiodinium C1 under certain field conditions, since rapid early growth typically limits mortality. Both symbiont types exhibited severe reductions in 14C incorporation during a 10-h exposure to the electron transport blocking herbicide diuron (DCMU), confirming the link between electron transport through PSII and photosynthate incorporation within the host tissue. These findings advance the current understanding of symbiotic relationships between corals and their symbionts, providing evidence that enhanced growth rates of juvenile corals may result from greater translocation of photosynthates from Symbiodinium C1.

Keywords

SymbiodiniumCoralSymbiosisPigmentDCMUDiuron

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • N. E. Cantin
    • 1
  • M. J. H. van Oppen
    • 2
  • B. L. Willis
    • 1
  • J. C. Mieog
    • 2
    • 3
  • A. P. Negri
    • 2
  1. 1.AIMS@JCU and ARC Centre of Excellence for Coral Reef Studies, School of Marine and Tropical BiologyJames Cook UniversityTownsvilleAustralia
  2. 2.Australian Institute of Marine Science PMB 3 TownsvilleTownsvilleAustralia
  3. 3.Department of Marine Benthic Ecology and Evolution, Centre for Ecological and Evolutionary Studies, Biological CentreUniversity of GroningenAA HarenThe Netherlands