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<title lang=en>Evidence for water-mediated mechanisms in coral–algal interactions</title>
<creator>Jorissen, Hendrikje</creator>
<creator>Skinner, Christina</creator>
<creator>Osinga, Ronald</creator>
<creator>Beer, Dirk de</creator>
<creator>Nugues, Maggy M.</creator>
<contributor>Aquaculture and Fisheries Group ; Wageningen Institute of Animal Science</contributor>
<contributor>Centre de recherches insulaires et observatoire de l'environnement (CRIOBE) ; Université de Perpignan Via Domitia (UPVD) - École pratique des hautes études (EPHE) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>School of Marine Science & Technology ; Newcastle University [Newcastle]</contributor>
<contributor>Oxford Medical School ; Oxford University</contributor>
<contributor>Marine Animal Ecology Group ; Wageningen University and Research Centre [Wageningen] (WUR)</contributor>
<contributor>Max Planck Institute for Marine Microbiology</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>
<description>International audience</description>
<source>ISSN: 0962-8452</source>
<source>Proceedings of the Royal Society B: Biological Sciences</source>
<publisher>Royal Society, The</publisher>
<identifier>hal-01359387</identifier>
<identifier>https://hal-univ-perp.archives-ouvertes.fr/hal-01359387</identifier>
<source>https://hal-univ-perp.archives-ouvertes.fr/hal-01359387</source>
<source>Proceedings of the Royal Society B: Biological Sciences, Royal Society, The, 2016, 〈10.1098/rspb.2016.1137 〉</source>
<identifier>DOI : 10.1098/rspb.2016.1137 </identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1098/rspb.2016.1137 </relation>
<language>en</language>
<subject lang=en>coral reef</subject>
<subject lang=en>coral–algal interactions</subject>
<subject lang=en>turf algae</subject>
<subject lang=en>water flow</subject>
<subject lang=en>oxygen concentrations</subject>
<subject>[SDV.EE] Life Sciences [q-bio]/Ecology, environment</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Although many coral reefs have shifted from coral-to-algal dominance, the consequence of such a transition for coral–algal interactions and their underlying mechanisms remain poorly understood. At the microscale, it is unclear how diffusive boundary layers (DBLs) and surface oxygen concentrations at the coral–algal interface vary with algal competitors and competitiveness. Using field observations and microsensor measurements in a flow chamber, we show that coral (massive Porites) interfaces with thick turf algae, macroalgae, and cyanobacteria, which are successful competitors against coral in the field, are characterized by a thick DBL and hypoxia at night. In contrast, coral interfaces with crustose coralline algae, conspecifics, and thin turf algae, which are poorer competitors, have a thin DBL and low hypoxia at night. Furthermore, DBL thickness and hypoxia at the interface with turf decreased with increasing flow speed, but not when thick turf was upstream. Our results support the importance of water-mediated transport mechanisms in coral–algal interactions. Shifts towards algal dominance, particularly dense assemblages, may lead to thicker DBLs, higher hypoxia, and higher concentrations of harmful metabolites and pathogens along coral borders, which in turn may facilitate algal overgrowth of live corals. These effects may be mediated by flow speed and orientation.</description>
<date>2016</date>
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