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<title lang=en>Effects of temperature and UVR on organic matter fluxes and the metabolic activity of acropora muricata</title>
<creator>Courtial, Lucile</creator>
<creator>Ferrier-Pagès, Christine</creator>
<creator>Jacquet, Stéphan</creator>
<creator>Rodolfo-Metalpa, Riccardo</creator>
<creator>Reynaud, Stéphanie</creator>
<creator>Rottier, Cécile</creator>
<creator>Houlbrèque, Fanny</creator>
<contributor>Centre Scientifique de Monaco (CSM) ; Musee oceanographique de Monaco</contributor>
<contributor>Ecologie marine tropicale des océans Pacifique et Indien (ENTROPIE [Nouvelle-Calédonie]) ; Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])</contributor>
<contributor>Laboratoire d'Excellence CORAIL (LabEX CORAIL) ; Institut de Recherche pour le Développement (IRD) - Université des Antilles et de la Guyane (UAG) - École des hautes études en sciences sociales (EHESS) - École pratique des hautes études (EPHE) - Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) - Université de la Réunion (UR) - Université de la Polynésie Française (UPF) - Université de Nouvelle Calédonie - Institut d'écologie et environnement</contributor>
<contributor>Université Pierre et Marie Curie - Paris 6 (UPMC)</contributor>
<contributor>Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) ; Institut National de la Recherche Agronomique (INRA) - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])</contributor>
<contributor>Centre Scientifique de Monaco; Universite Pierre et Marie Curie (Paris VI University); Institut National de la Recherche Agronomique; Departement Soutien et Formation, Institut de Recherche pour le Developpement (Noumea, New Caledonia) </contributor>
<source>ISSN: 2046-6390</source>
<source>Biology Open</source>
<publisher>Royal Society</publisher>
<identifier>hal-01606454</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01606454</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01606454</source>
<source>Biology Open, Royal Society, 2017, 6 (8), pp.1190-1199. 〈10.1242/bio.026757〉</source>
<identifier>DOI : 10.1242/bio.026757</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1242/bio.026757</relation>
<identifier>PRODINRA : 406580</identifier>
<identifier>PUBMED : 28811302</identifier>
<relation>info:eu-repo/semantics/altIdentifier/pmid/28811302</relation>
<language>en</language>
<subject lang=en>Acropora muricata</subject>
<subject lang=en>Climate change</subject>
<subject lang=en>Microbial loop</subject>
<subject lang=en>Organic matter fluxes</subject>
<subject lang=en>Thermal stress</subject>
<subject lang=en>UV radiation</subject>
<subject lang=en>organic matter</subject>
<subject lang=en>global change</subject>
<subject lang=en>coral</subject>
<subject lang=fr>corail</subject>
<subject lang=fr>matière organique</subject>
<subject lang=fr>température</subject>
<subject lang=fr>activité métabolique</subject>
<subject lang=fr>changement climatique</subject>
<subject>[SDV] Life Sciences [q-bio]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Coral bleaching events are predicted to occur more frequently in the coming decades with global warming. The susceptibility of corals to bleaching during thermal stress episodes depends on many factors, including the magnitude of thermal stress and irradiance. The interactions among these two factors, and in particular with ultra-violet radiation (UVR), the most harmful component of light, are more complex than assumed, and are not yet well understood. This paper explores the individual and combined effects of temperature and UVR on the metabolism of Acropora muricata, one of the most abundant coral species worldwide. Particulate and dissolved organic matter (POM/DOM) fluxes and organic matter (OM) degradation by the mucus-associated bacteria were also monitored in all conditions. The results show that UVR exposure exacerbated the temperature-induced bleaching, but did not affect OM fluxes, which were only altered by seawater warming. Temperature increase induced a shift from POM release and DOM uptake in healthy corals to POM uptake and DOM release in stressed ones. POM uptake was linked to a significant grazing of pico- and nanoplankton particles during the incubation, to fulfil the energetic requirements of A. muricata in the absence of autotrophy. Finally, OM degradation by mucus-associated bacterial activity was unaffected by UVR exposure, but significantly increased under high temperature. Altogether, our results demonstrate that seawater warming and UVR not only affect coral physiology, but also the way corals interact with the surrounding seawater, with potential consequences for coral reef biogeochemical cycles and food webs.</description>
<date>2017</date>
</dc>
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