Suppression of skeletal growth in scleractinian corals by decreasing ambient carbonate-ion concentration: a cross-family comparison

Francesca Marubini, C. Ferrier-Pages, J. P. Cuif

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    Abstract

    Biogenic calcification is influenced by the concentration of available carbonate ions. The recent confirmation of this for hermatypic corals has raised concern over the future of coral reefs because [CO32-] is a decreasing function of increasing pCO(2) in the atmosphere. As one of the overriding features of coral reefs is their diversity, understanding the degree of variability between species in their ability to cope with a change in [CO32-] is a priority. We cultured four phylogenetically and physiologically different species of hermatypic coral (Acropora verweyi, Galaxea fascicularis, Pavona cactus, and Turbinaria reniformis) under 'normal' (280 mumol kg(-1)) and 'low' (140 mumol kg(-1)) carbonate-ion concentrations. The effect on skeletogenesis was investigated quantitatively (by calcification rate) and qualitatively (by microstructural appearance of growing crystalline fibres using scanning electron microscopy (SEM)). The 'low carbonate' treatment resulted in a significant suppression of calcification rate and a tendency for weaker crystallization at the distal tips of fibres. However, while the calcification rate was affected uniformly across species (13-18% reduction), the magnitude of the microstructural response was highly species specific: crystallization was most markedly affected in A. verweyi and least in T. reniformis. These results are discussed in relation to past records and future predictions of carbonate variability in the oceans.

    Original languageEnglish
    Pages (from-to)179-184
    Number of pages5
    JournalProceedings of the Royal Society of London. B, Biological Sciences
    Volume270
    Issue number1511
    DOIs
    Publication statusPublished - 2003

    Keywords

    • calcification
    • carbonate-ion concentration
    • carbon dioxide
    • hermatypic corals
    • fibre microstructure
    • GLOBAL CHANGE
    • CALCIFICATION
    • DIOXIDE
    • REEF
    • SEAWATER
    • PHOTOSYNTHESIS
    • CONSEQUENCES
    • SATURATION
    • PRESSURE
    • CO2

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