Abstract
Coral thermal tolerance is strongly influenced by the identity of obligate photosymbionts, which encompass numerous types belonging to the dinoflagellate genus Symbiodinium1. Physiological advantages achieved by partnering with functionally diverse symbionts2,3,4 have been assumed to be available only to corals that can form associations with multiple Symbiodinium types. Functional variation among populations of the same type of Symbiodinium has been overlooked, despite local adaptation being feasible because of large population sizes5,6, genetic isolation7,8 and short asexual generation times9. Here we demonstrate divergent thermal tolerance in a generalist Symbiodinium type from two different thermal environments. Symbiodinium from the warmer reef maintained greater photo-chemical performance and survivorship when exposed to an elevated temperature of 32 °C, both in symbiosis and in culture. Juvenile corals associated with Symbiodinium from the warmer reef grew rapidly when exposed to 32 °C, yet underwent bleaching and tissue death when associated with Symbiodinium from the cooler reef. These results demonstrate that Symbiodinium types can adapt to local differences in thermal climate and that this adaptation shapes the fitness of coral hosts. If Symbiodinium populations are able to further adapt to increases in temperature at the pace at which ocean climates warm, they may assist corals to increase their thermal tolerance and persist into the future.
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Acknowledgements
The Centre for Marine Microbiology and Genetics at the Australian Institute of Marine Science provided aquarium facilities and M. Salmon, J. Hochen, R. Berkelmans, D. Bourne and E. Puill-Stephan assisted with set-up or materials. R. Berkelmans and L. Tonk provided information on the distribution of Symbiodinium types on the Great Barrier Reef. J. White, J. Tan, S. Gardner, P. Warner, M. Condy, A. Moya and A. Baird assisted with fieldwork. J. Doyle, A. Negri, V. Cumbo and S. Uthicke provided technical advice on pigment analysis, coral larval rearing, Symbiodinium inoculation and chlorophyll fluorescence. The study was funded by an Australian Research Council grant to B.L.W. and M.J.H.v.O., an AIMS@JCU grant to E.J.H., and a Marine and Tropical Sciences Research Facility grant to B.L.W., M.J.H.v.O. and L.K.B.
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E.J.H. designed the study, collected and analysed data, and wrote the manuscript. L.K.B., B.L.W. and M.J.H.v.O. contributed to study design and manuscript writing. V.H.B. originated and maintained Symbiodinium cultures. N.W.L. assisted with field and laboratory work. All authors discussed the results and commented on the manuscript.
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Howells, E., Beltran, V., Larsen, N. et al. Coral thermal tolerance shaped by local adaptation of photosymbionts. Nature Clim Change 2, 116–120 (2012). https://doi.org/10.1038/nclimate1330
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DOI: https://doi.org/10.1038/nclimate1330
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