Response of two temperate scleractinian corals to projected ocean warming and marine heatwaves

Type : ACL
Nature : Production scientifique
Au bénéfice du Laboratoire : Oui
Statut de publication : Publié
Année de publication : 2024
Auteurs (6) : CARBONNE Chloe COMEAU Steeve PLICHON Keyla SCHAUB Sebastien GATTUSO Jean-pierre TEIXIDO Nuria
Revue scientifique : Royal Society open science
Volume : 11
Fascicule : 3
Pages :
DOI : 10.1098/rsos.231683
URL : https://royalsocietypublishing.org/doi/10.1098/rsos.231683
Abstract : The Mediterranean Sea is a hotspot of global change, particularly exposed to ocean warming and the increasing occurrence of marine heatwaves (MHWs). However, experiments based on long-term temperature data from the field are scarce. Here, we investigate the response of the zooxanthellate coral Cladocora caespitosa and the azooxanthellate coral Astroides calycularis to future warming and MHWs based on 8 years of in situ data. Corals were maintained in the laboratory for five months under four temperature conditions: Warming (3.2°C above the in situ mean from 2012 to 2020), Heatwave (temperatures of 2018 with two heatwaves), Ambient (in situ mean) and Cool (deeper water temperatures). Under the Warming treatment, some C. caespitosa colonies severely bleached and A. calycularis colonies presented necrosis. Cladocora caespitosa symbiosis was impaired by temperature with a decrease in the density of endosymbiotic algae and an increase in per cent whiteness in all the treatments except for the coolest. Recovery for both species was observed through different mechanisms such as regrowth of polyps of A. calycularis and recovery of pigmentation for C. caespitosa. These results suggest that A. calycularis and C. caespitosa may be resilient to heat stress and can recover from physiological stresses caused by heatwaves in the laboratory.
Mots-clés : bleaching, coral, marine heatwaves, Mediterranean Sea, ocean warming
Commentaire : Publisher: Royal Society
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Citation :
Carbonne C, Comeau S, Plichon K, Schaub S, Gattuso J-P, Teixido N (2024) Response of two temperate scleractinian corals to projected ocean warming and marine heatwaves. R Soc Open Sci 11 | doi: 10.1098/rsos.231683