Juveniles of the Atlantic coral, Favia fragum (Esper, 1797) do not invest energy to maintain calcification under ocean acidification

TitleJuveniles of the Atlantic coral, Favia fragum (Esper, 1797) do not invest energy to maintain calcification under ocean acidification
Publication TypeJournal Article
Year of Publication2018
AuthorsDrenkard E.J, Cohen A.L, McCorkle D.C, de Putron S.J, Starczak V.R, Repeta D.J
JournalJournal of Experimental Marine Biology and Ecology
Volume507
Pagination61-69
Date Published2018/10
Type of ArticleArticle
ISBN Number0022-0981
Accession NumberWOS:000442704000008
Keywordsastrangia; calcium-carbonate saturation; Environmental Sciences & Ecology; hermatypic coral; ion concentration; light availability; Marine & Freshwater Biology; poculata; population-density; reef-building corals; seawater; stylophora-pistillata; symbiotic coral
Abstract

Ocean acidification (OA) threatens coral reef ecosystems by slowing calcification and enhancing dissolution of calcifying organisms and sediments. Nevertheless, multiple factors have been shown to modulate OA's impact on calcification, including the nutritional status of the coral host. In three separate experiments, we exposed juveniles of the Atlantic golf ball coral, Favia fragum, to elevated CO2 and varied nutritional (light or feeding) conditions. Juveniles reared from planulae larvae were significantly larger and produced more CaCO3 when fed, regardless of CO2 level. However, corals subjected to elevated CO2 produced less CaCO3 per mm(2) regardless of feeding condition. Additionally, unfed corals reared under elevated light levels exhibited lower chlorophyll a and higher total lipid content, but light had no significant effect on coral calcification. Conversely, elevated CO2 had a significant, negative affect on calcification, regardless of light condition but no detectable effect on physiological tissue parameters. Our results indicate that the sensitivity of juvenile F. fragum calcification to OA was neither modulated by light nor by feeding, despite physiological indications of enhanced nutritional status. This suggests that corals do not necessarily divert energy to maintain calcification under high CO2, even when they have the energetic resources to do so.

DOI10.1016/j.jembe.20180.07.007
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