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• W1996325707 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 220:153-162 (2001) - doi:10.3354/meps220153 Dependence of calcification on light and carbonate ion concentration for the hermatypic coral Porites compressa F. Marubini1,*, H. Barnett1, C. Langdon2, M. J. Atkinson3 1Columbia University Biosphere 2 Center, Oracle, Arizona, USA 2Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA 3HIMB, PO Box 1346, 46-007 Lilipuna Road, Kanehoe, Hawaii 96744, USA *Present address: Observatoire Océanologique Européen, Centre Scientifique de Monaco, Avenue Saint-Martin, MC-98000 Monaco. E-mail: fmarubini@yahoo.com ABSTRACT: Temperature, light and aragonite saturation state of seawater are important determinants of the global distribution of coral reefs. Saturation state of surface seawater is decreasing in response to increases in atmospheric pCO2, causing concern for a global reduction in the rates of reef accretion. In this study we address the influences of light and saturation state on skeletal growth of the hermatypic coral Porites compressa. We conducted 2 experiments using coral nubbins; one in a controlled laboratory with Biosphere 2 ocean water and the other in the 711 m2 Biosphere 2 ocean itself. The laboratory experiment consisted of 3 light treatments (PAR = 698, 150, 81 µmol photons m-2 s-1) and 2 chemical treatments (pCO2 = 199 µatm, Ω = 5.05, CO32- = 355 µmol kg-1; and pCO2 = 448 µatm, Ω = 2.48, CO32- = 183 µmol kg-1). In the Biosphere 2 ocean, coral nubbins were deployed at 4 depths (6, 4, 2 and 0.5 m) which corresponded to different light conditions (PAR from 2.7 to 29.5 mol photons m-2 d-1) during 3 different chemical states, mimicking the conditions of the Last Glacial Maximum (LGM), the present day and the year 2100 (Y2100). Calcification rate changed with light following the typical hyperbolic tangent function. Calcification rate was positively correlated with saturation state, which ranged from 5 (LGM) to 2.4 (Y2100). From the glacial experimental conditions (Ω= 5.05, pCO2 = 186) to those of the future (Ω = 2.25, pCO2 = 641), calcification dropped by 30%; from present day conditions (Ω = 3.64, pCO2 = 336) to those of the future, calcification dropped by 11%. This decrease in calcification rate occurred at all light levels, indicating that rising CO2 will impact corals living at all depths. KEY WORDS: Coral · Calcification · Photosynthesis · Light · [CO32-] · pCO2 · Aragonite saturation state Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 220. Online publication date: September 27, 2001 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2001 Inter-Research." @default.
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• W1996325707 date "2001-01-01" @default.
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• W1996325707 title "Dependence of calcification on light and carbonate ion concentration for the hermatypic coral Porites compressa" @default.
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• W1996325707 doi "https://doi.org/10.3354/meps220153" @default.
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