Cold‐water coral ecosystems under future ocean change: Live coral performance vs. framework dissolution and bioerosion

Cold‐water coral ecosystems under future ocean change: Live coral performance vs. framework dissolution and bioerosion

Physiological sensitivity of cold‐water corals to ocean change is far less understood than of tropical corals and very little is known about the impacts of ocean acidification and warming on degradative processes of dead coral framework. In a 13‐month laboratory experiment, we examined the interacti...

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Veröffentlicht in:Limnology and oceanography 2022-11, Vol.67 (11), p.2497-2515
Hauptverfasser: Büscher, Janina Vanessa, Form, Armin Uwe, Wisshak, Max, Kiko, Rainer, Riebesell, Ulf
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container_end_page 2515
container_issue 11
container_start_page 2497
container_title Limnology and oceanography
container_volume 67
creator Büscher, Janina Vanessa
Form, Armin Uwe
Wisshak, Max
Kiko, Rainer
Riebesell, Ulf
description Physiological sensitivity of cold‐water corals to ocean change is far less understood than of tropical corals and very little is known about the impacts of ocean acidification and warming on degradative processes of dead coral framework. In a 13‐month laboratory experiment, we examined the interactive effects of gradually increasing temperature and pCO2 levels on survival, growth, and respiration of two prominent color morphotypes (colormorphs) of the framework‐forming cold‐water coral Lophelia pertusa, as well as bioerosion and dissolution of dead framework. Calcification rates tended to increase with warming, showing temperature optima at ~ 14°C (white colormorph) and 10–12°C (orange colormorph) and decreased with increasing pCO2. Net dissolution occurred at aragonite undersaturation (ΩAr 
doi_str_mv 10.1002/lno.12217
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Mortality increased considerably at 14–15°C in both colormorphs. Bioerosion/dissolution of dead framework was not affected by warming alone but was significantly enhanced by acidification. While live corals may cope with intermediate levels of elevated pCO2 and temperature, long‐term impacts beyond levels projected for the end of this century will likely lead to skeletal dissolution and increased mortality. 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Mortality increased considerably at 14–15°C in both colormorphs. Bioerosion/dissolution of dead framework was not affected by warming alone but was significantly enhanced by acidification. While live corals may cope with intermediate levels of elevated pCO2 and temperature, long‐term impacts beyond levels projected for the end of this century will likely lead to skeletal dissolution and increased mortality. 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Mortality increased considerably at 14–15°C in both colormorphs. Bioerosion/dissolution of dead framework was not affected by warming alone but was significantly enhanced by acidification. While live corals may cope with intermediate levels of elevated pCO2 and temperature, long‐term impacts beyond levels projected for the end of this century will likely lead to skeletal dissolution and increased mortality. 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title Cold‐water coral ecosystems under future ocean change: Live coral performance vs. framework dissolution and bioerosion
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