NDLI: The effect of temperature stress on coral–Symbiodinium associations containing distinct symbiont types

Content Provider	Springer Nature Link
Author	Fisher, P. L. Malme, M. K. Dove, S.
Copyright Year	2011
Abstract	Several studies have demonstrated that the temperature tolerance of scleractinian reef-building corals is controlled, in part, by hosting physiologically distinct symbiotic algae. We investigated the thermal tolerance of coral–algal associations within seven common species of reef-building corals hosting distinct Symbiodinium sub-clades collected from Heron Island during experimentally induced bleaching conditions. During experimental heating, photosynthetic fitness was assessed by the dark-adapted yield of PSII (F v/F m), and excitation pressure across PSII (Q m) of each coral–algal association using pulse amplitude modulation fluorometry. The onset of bleaching was determined by the measurement of Symbiodinium cell density. Using the ribosomal internal transcribed spacer 2 (ITS-2) region, we showed that Symbiodinium type–coral host associations were temporally and spatially conserved in a high proportion of the colonies sampled within each species. Generally, the species Acropora millepora, Platygyra daedalea, Acropora aspera and Acropora formosa contained Symbiodinium ITS-2 type C3, whereas the species Montipora digitata, Porites cylindrica and Porites lutea contained Symbiodinium type C15. Bleaching susceptibility showed some association with Symbiodinium type, but further research is required to confirm this. Corals hosting C3 Symbiodinium displayed higher reductions in F v/F m during heating compared to their C15 counterparts, irrespective of host species. However, a corresponding reduction in Symbiodinium density was not observed. Nonetheless, A. aspera and A. formosa showed significant reductions in Symbiodinium density relative to controls. This correlated with large increases in Q m and decreases in F v/F m in heated explants. Our results suggest a range of bleaching susceptibilities for the coral species investigated, with A. aspera and A. formosa showing the greatest susceptibility to bleaching and M. digitata showing the lowest bleaching susceptibility. The data provide strong evidence for distinct differences in temperature tolerance between C3 and C15 Symbiodinium types when in-hospite; however, future studies addressing the confounding effect of host species would help to confirm this.
Starting Page	473
Ending Page	485
Page Count	13
File Format	PDF
ISSN	07224028
Journal	Coral Reefs
Volume Number	31
Issue Number	2
e-ISSN	14320975
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-12-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Symbiodinium Coral bleaching Thermal stress Photosynthesis Light pressure Oceanography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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