Differential stability of photosynthetic membranes and fatty acid composition at elevated temperature in Symbiodinium

E. Díaz-Almeyda, P. E. Thomé, M. El Hafidi, Roberto Iglesias-Prieto

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Coral reefs are threatened by increasing surface seawater temperatures resulting from climate change. Reef-building corals symbiotic with dinoflagellates in the genus Symbiodinium experience dramatic reductions in algal densities when exposed to temperatures above the long-term local summer average, leading to a phenomenon called coral bleaching. Although the temperature-dependent loss in photosynthetic function of the algal symbionts has been widely recognized as one of the early events leading to coral bleaching, there is considerable debate regarding the actual damage site. We have tested the relative thermal stability and composition of membranes in Symbiodinium exposed to high temperature. Our results show that melting curves of photosynthetic membranes from different symbiotic dinoflagellates substantiate a species-specific sensitivity to high temperature, while variations in fatty acid composition under high temperature rather suggest a complex process in which various modifications in lipid composition may be involved. Our results do not support the role of unsaturation of fatty acids of the thylakoid membrane as being mechanistically involved in bleaching nor as being a dependable tool for the diagnosis of thermal susceptibility of symbiotic reef corals.

Original languageEnglish (US)
Pages (from-to)217-225
Number of pages9
JournalCoral Reefs
Volume30
Issue number1
DOIs
StatePublished - Mar 1 2011

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Symbiodinium
coral bleaching
fatty acid
fatty acid composition
membrane
dinoflagellate
coral reef
temperature
bleaching
symbiont
coral reefs
coral
reef
melting
lipid
seawater
damage
climate change
summer
lipid composition

All Science Journal Classification (ASJC) codes

  • Aquatic Science

Cite this

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Differential stability of photosynthetic membranes and fatty acid composition at elevated temperature in Symbiodinium. / Díaz-Almeyda, E.; Thomé, P. E.; Hafidi, M. El; Iglesias-Prieto, Roberto.

In: Coral Reefs, Vol. 30, No. 1, 01.03.2011, p. 217-225.

Research output: Contribution to journalArticle

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