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High summer temperatures amplify functional differences between coral- and algae-dominated reef communities

High summer temperatures amplify functional differences between coral- and algae-dominated reef communities

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ROTH, Florian, Nils RÄDECKER, Susana CARVALHO, Carlos M DUARTE, Vincent SADERNE, Andrea ANTON, Luis SILVA, Maria Ll CALLEJA, Xosé Anxelu G MORÁN, Christian VOOLSTRA, Benjamin KÜRTEN, Burton H JONES, Christian WILD, 2020. High summer temperatures amplify functional differences between coral- and algae-dominated reef communities. In: Ecology. Wiley. ISSN 0012-9658. eISSN 1939-9170. Available under: doi: 10.1002/ecy.3226

@article{Roth2020-10-17summe-51467, title={High summer temperatures amplify functional differences between coral- and algae-dominated reef communities}, year={2020}, doi={10.1002/ecy.3226}, issn={0012-9658}, journal={Ecology}, author={Roth, Florian and Rädecker, Nils and Carvalho, Susana and Duarte, Carlos M and Saderne, Vincent and Anton, Andrea and Silva, Luis and Calleja, Maria Ll and Morán, Xosé Anxelu G and Voolstra, Christian and Kürten, Benjamin and Jones, Burton H and Wild, Christian} }

Duarte, Carlos M Carvalho, Susana Rädecker, Nils Voolstra, Christian 2020-10-17 Anton, Andrea Silva, Luis terms-of-use Anton, Andrea 2020-10-26T12:04:06Z Wild, Christian Duarte, Carlos M 2020-10-26T12:04:06Z Roth, Florian Roth, Florian Kürten, Benjamin Kürten, Benjamin Calleja, Maria Ll Jones, Burton H High summer temperatures amplify functional differences between coral- and algae-dominated reef communities Silva, Luis Shifts from coral to algal dominance are expected to increase in tropical coral reefs as a result of anthropogenic disturbances. The consequences for key ecosystem functions such as primary productivity, calcification, and nutrient recycling are poorly understood, particularly under changing environmental conditions. We used a novel in situ incubation approach to compare functions of coral- and algae-dominated communities in the central Red Sea bi-monthly over an entire year. In situ gross and net community primary productivity, calcification, dissolved organic carbon fluxes, dissolved inorganic nitrogen fluxes, and their respective activation energies were quantified to describe the effects of seasonal changes. Overall, coral-dominated communities exhibited 30% lower net productivity and 10 times higher calcification than algae-dominated communities. Estimated activation energies indicated a higher thermal sensitivity of coral-dominated communities. In these communities, net productivity and calcification were negatively correlated with temperature (>40% and >65% reduction, respectively, with +5°C increase from winter to summer), while carbon losses via respiration and dissolved organic carbon release were more than doubled at higher temperatures. In contrast, algae-dominated communities doubled net productivity in summer, while calcification and dissolved organic carbon fluxes were unaffected. These results suggest pronounced changes in community functioning associated with phase shifts. Algae-dominated communities may outcompete coral-dominated communities due to their higher productivity and carbon retention to support fast biomass accumulation while compromising the formation of important reef framework structures. Higher temperatures likely amplify these functional differences, indicating a high vulnerability of ecosystem functions of coral-dominated communities to temperatures even below coral bleaching thresholds. Our results suggest that ocean warming may not only cause but also amplify coral-algal phase shifts in coral reefs. Rädecker, Nils Morán, Xosé Anxelu G Wild, Christian Voolstra, Christian Morán, Xosé Anxelu G Jones, Burton H Calleja, Maria Ll Saderne, Vincent Saderne, Vincent eng Carvalho, Susana

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