Courtial L. auteur aut IRD Roberty S. auteur aut IRD Shick J. M. auteur aut IRD Houlbrèque Fanny auteur aut IRD Ferrier-Pages C. auteur aut IRD text journalArticle eng text/pdf born digital access In shallow tropical waters, ultraviolet radiation (UVR) occurs at high intensity simultaneously with high water temperatures, and both stressors are predicted to increase in the future and to have a major impact on reef coral survival. The poor knowledge of the interactive effects of those two factors, however, prevents a good estimation of the coral resistance to climate change pressure. The results obtained in this study on two genetically distant scleractinian coral species, Pocillopora damicornis and Turbinaria reniformis, highlight an interaction of temperature and UVR on the corals' physiology as well as a species-specific response. Overall, increase in UVR level exacerbated the negative impact of thermal stress. Whereas stressors did not reduce the autotrophic capacity (symbiont density, net photosynthetic rates) of T. reniformis, they significantly lowered it in P. damicornis, which initially contained twice more symbionts in its tissue. Only grazing rates (heterotrophy) were significantly decreased in T. reniformis under thermal stress. For both corals, calcification was slowed by the combination of thermal and UVR stress. Calcification was impaired likely due to a decrease in autotrophic energy supply in P. damicornis, and in heterotrophic energy supply in T. reniformis. This study confirms that the response of corals to global change needs to be studied using multifactorial approaches and a combination of different environmental factors. specialized 036 62 3 1000-1013 2017 0024-3590 https://www.documentation.ird.fr/hor/fdi:010070243 10.1002/lno.10481 0024-3590 [F B010070243] https://www.documentation.ird.fr/hor/fdi:010070243 https://www.documentation.ird.fr/intranet/publi/2017/07/010070243.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2017-07-26 2018-01-02 fdi:010070243 fre