Houlbrèque Fanny auteur aut IRD Reynaud S. auteur aut IRD Godinot C. auteur aut IRD Oberhansli F. auteur aut IRD Rodolfo-Metalpa Riccardo auteur aut IRD Ferrier-Pages C. auteur aut IRD text journalArticle eng text/pdf born digital access A general decline in coral calcification has been observed in response to ocean acidification. It has recently been shown that heterotrophic feeding (the acquisition of organic nutrients) enables one massive coral species to maintain its calcification rates while exposed to ocean acidification but the consequences of higher seawater partial pressure of CO2 (P-CO2) on coral feeding capacities themselves have never been investigated. Exposing long-term acclimated starved and fed colonies of the major reef builder Stylophora pistillata to either ambient pH(T) (8.06 +/- 0.05; 417 Pa P-CO2) or low pH(T) (7.51 +/- 0.06; 1697 Pa P-CO2) showed that higher feeding rates can counterbalance the negative effects of seawater acidification on coral calcification. Indeed, relative to unfed corals under ambient pH(T) conditions, calcification rates in unfed corals decreased by 53.6% but remained constant in fed corals under high P-CO2 conditions. Results also clearly show that acidification affects the feeding capacity and feeding effort of the branching coral S. pistillata. Organic nutrient acquisition was severely reduced under high P-CO2, with a simultaneous decrease in the dissolved free amino acid uptake rates, the alkaline phosphatase activities, and the feeding rates on Artemia salina nauplii. Considering that all these processes are needed to fulfill the nutrient needs of the symbiotic association, on a long-term basis, lower feeding rates will likely aggravate the already fragile physiological state of many corals under warmer, more acidic conditions. specialized 036 60 1 89-99 2015 0024-3590 https://www.documentation.ird.fr/hor/fdi:010063918 10.1002/lno.10003 0024-3590 [F B010063918] https://www.documentation.ird.fr/hor/fdi:010063918 https://www.documentation.ird.fr/intranet/publi/2015/03/010063918.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-04-07 2017-08-23 fdi:010063918 fre