Widespread oxyregulation in tropical corals under hypoxia

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HUGHES, David J., James ALEXANDER, Gary COBBS, Michael KÜHL, Chris COONEY, Mathieu PERNICE, Deepa VARKEY, Christian R. VOOLSTRA, David J. SUGGETT, 2022. Widespread oxyregulation in tropical corals under hypoxia. In: Marine Pollution Bulletin. Elsevier. 179, 113722. ISSN 0025-326X. eISSN 1879-3363. Available under: doi: 10.1016/j.marpolbul.2022.113722

@article{Hughes2022Wides-57509, title={Widespread oxyregulation in tropical corals under hypoxia}, year={2022}, doi={10.1016/j.marpolbul.2022.113722}, volume={179}, issn={0025-326X}, journal={Marine Pollution Bulletin}, author={Hughes, David J. and Alexander, James and Cobbs, Gary and Kühl, Michael and Cooney, Chris and Pernice, Mathieu and Varkey, Deepa and Voolstra, Christian R. and Suggett, David J.}, note={Article Number: 113722} }

Widespread oxyregulation in tropical corals under hypoxia Hypoxia (low oxygen stress) is increasingly reported on coral reefs, caused by ocean deoxygenation linked to coastal nutrient pollution and ocean warming. While the ability to regulate respiration is a key driver of hypoxia tolerance in many other aquatic taxa, corals' oxyregulatory capabilities remain virtually unexplored. Here, we examine O2-consumption patterns across 17 coral species under declining O2 partial pressure (pO2). All corals showed ability to oxyregulate, but total positive regulation (Tpos) varied between species, ranging from 0.41 (Pocillopora damicornis) to 2.42 (P. acuta). On average, corals performed maximum regulation effort (Pcmax) at low pO2 (30% air saturation, corresponding to lower O2 levels measured on natural reef systems), and exhibited detectable regulation down to as low as <10% air saturation. Our study shows that corals are not oxyconformers as previously thought, suggesting oxyregulation is likely important for survival in dynamic O2 environments of shallow coral reefs subjected to hypoxic events. Pernice, Mathieu Pernice, Mathieu Cooney, Chris Cobbs, Gary 2022 Alexander, James 2022-05-12T09:25:29Z Suggett, David J. eng Varkey, Deepa 2022-05-12T09:25:29Z Voolstra, Christian R. Hughes, David J. Hughes, David J. Alexander, James Cooney, Chris terms-of-use Suggett, David J. Kühl, Michael Cobbs, Gary Voolstra, Christian R. Varkey, Deepa Kühl, Michael

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