Dependence of calcification on light and carbonate ion concentration for the hermatypic coral Porites compressa

Francesca Marubini, H. Barnett, C. Langdon, M. J. Atkinson

    Research output: Contribution to journalArticle

    154 Citations (Scopus)

    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 m(2) Biosphere 2 ocean itself, The laboratory experiment consisted of 3 light treatments (PAR = 698, 150, 81 mu mol photons m(-2) s(-1)) and 2 chemical treatments (pCO(2) = 199 mu atm, Omega = 5.05, CO32- = 355 mu mol kg(-1); and pCO(2) = 448 mu atm, Omega = 2.48, CO32- = 183 mu mol 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 (Omega = 5.05, pCO(2) = 186) to those of the future (Omega = 2.25, pCO(2) = 641), calcification dropped by 30%; from present day conditions (Omega = 3.64, pCO(2) = 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.

    Original languageEnglish
    Pages (from-to)153-162
    Number of pages9
    JournalMarine Ecology Progress Series
    Volume220
    Publication statusPublished - 2001

    Keywords

    • coral
    • calcification
    • photosynthesis
    • light
    • [CO32-]
    • pCO(2)
    • aragonite saturation state
    • SHADE-ADAPTED COLONIES
    • STYLOPHORA-PISTILLATA
    • GROWTH-RATES
    • SYMBIOTIC CORAL
    • ENERGY BUDGET
    • RED-SEA
    • REEF
    • PHOTOSYNTHESIS
    • SEAWATER
    • TEMPERATURE

    Cite this

    Dependence of calcification on light and carbonate ion concentration for the hermatypic coral Porites compressa. / Marubini, Francesca; Barnett, H.; Langdon, C.; Atkinson, M. J.

    In: Marine Ecology Progress Series, Vol. 220, 2001, p. 153-162.

    Research output: Contribution to journalArticle

    Marubini, Francesca ; Barnett, H. ; Langdon, C. ; Atkinson, M. J. / Dependence of calcification on light and carbonate ion concentration for the hermatypic coral Porites compressa. In: Marine Ecology Progress Series. 2001 ; Vol. 220. pp. 153-162.
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    T1 - Dependence of calcification on light and carbonate ion concentration for the hermatypic coral Porites compressa

    AU - Marubini, Francesca

    AU - Barnett, H.

    AU - Langdon, C.

    AU - Atkinson, M. J.

    PY - 2001

    Y1 - 2001

    N2 - 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 m(2) Biosphere 2 ocean itself, The laboratory experiment consisted of 3 light treatments (PAR = 698, 150, 81 mu mol photons m(-2) s(-1)) and 2 chemical treatments (pCO(2) = 199 mu atm, Omega = 5.05, CO32- = 355 mu mol kg(-1); and pCO(2) = 448 mu atm, Omega = 2.48, CO32- = 183 mu mol 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 (Omega = 5.05, pCO(2) = 186) to those of the future (Omega = 2.25, pCO(2) = 641), calcification dropped by 30%; from present day conditions (Omega = 3.64, pCO(2) = 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.

    AB - 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 m(2) Biosphere 2 ocean itself, The laboratory experiment consisted of 3 light treatments (PAR = 698, 150, 81 mu mol photons m(-2) s(-1)) and 2 chemical treatments (pCO(2) = 199 mu atm, Omega = 5.05, CO32- = 355 mu mol kg(-1); and pCO(2) = 448 mu atm, Omega = 2.48, CO32- = 183 mu mol 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 (Omega = 5.05, pCO(2) = 186) to those of the future (Omega = 2.25, pCO(2) = 641), calcification dropped by 30%; from present day conditions (Omega = 3.64, pCO(2) = 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.

    KW - coral

    KW - calcification

    KW - photosynthesis

    KW - light

    KW - [CO32-]

    KW - pCO(2)

    KW - aragonite saturation state

    KW - SHADE-ADAPTED COLONIES

    KW - STYLOPHORA-PISTILLATA

    KW - GROWTH-RATES

    KW - SYMBIOTIC CORAL

    KW - ENERGY BUDGET

    KW - RED-SEA

    KW - REEF

    KW - PHOTOSYNTHESIS

    KW - SEAWATER

    KW - TEMPERATURE

    M3 - Article

    VL - 220

    SP - 153

    EP - 162

    JO - Marine Ecology Progress Series

    JF - Marine Ecology Progress Series

    SN - 0171-8630

    ER -