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    Differential response of corals to regional mass-warming events as evident from skeletal Sr/Ca and Mg/Ca ratios

    Access Status
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    Authors
    Clarke, H.
    D'Olivo, J.
    Falter, J.
    Zinke, Jens
    Lowe, R.
    McCulloch, M.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Clarke, H. and D'Olivo, J. and Falter, J. and Zinke, J. and Lowe, R. and McCulloch, M. 2017. Differential response of corals to regional mass-warming events as evident from skeletal Sr/Ca and Mg/Ca ratios. Geochemistry, Geophysics, Geosystems. 18 (5): pp. 1794-1809.
    Source Title
    Geochemistry, Geophysics, Geosystems
    DOI
    10.1002/2016GC006788
    ISSN
    1525-2027
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/53343
    Collection
    • Curtin Research Publications
    Abstract

    During the summer of 2010/2011, a regional marine heat wave resulted in coral bleaching of variable severity along much of the western coastline of Australia. At Ningaloo Reef, a 300 km long fringing reef system and World Heritage site, highly contrasting coral bleaching was observed between two morphologically distinct nearshore reef communities located on either side of the Ningaloo Peninsula: Tantabiddi (~20% bleaching) and Bundegi (~90% bleaching). For this study, we collected coral cores (Porites sp.) from Tantabiddi and Bundegi reef sites to assess the response of the Sr/Ca temperature proxy and Mg/Ca ratios to the variable levels of thermal stress imposed at these two sites during the 2010/2011 warming event. We found that there was an anomalous increase in Sr/Ca and decrease in Mg/Ca ratios in the Bundegi record that was coincident with the timing of severe coral bleaching at the site, while no significant changes were observed in the Tantabiddi record. We show that the change in the relationship of Sr/Ca and Mg/Ca ratios with temperature at Bundegi during the 2010/2011 event reflects changes in related coral "vital" processes during periods of environmental stress. These changes were found to be consistent with a reduction in active transport of Ca2+ to the site of calcification leading to a reduction in calcification rates and reduced Rayleigh fractionation of incorporated trace elements.

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