Declining Coral Calcification on the Great Barrier Reef
Declining Coral Calcification on the Great Barrier Reef
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DOI：
10.1126/science.1165283
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发表时间：
2009-01-02
期刊：
影响因子：
56.9
通讯作者：
Fabricius, Katharina E.
中科院分区：
文献类型：
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作者：
De'ath, Glenn;Lough, Janice M.;Fabricius, Katharina E.
造礁珊瑚因气候变化以及海洋吸收不断增加的大气二氧化碳而面临日益增大的生理压力。我们对来自澳大利亚大堡礁69个珊瑚礁的328个滨珊瑚群体进行了研究。它们的骨骼记录显示，自1990年以来，整个大堡礁的钙化作用下降了14.2%，主要是因为延伸（线性生长）下降了13.3%。数据表明，这种钙化作用如此严重且突然的下降至少在过去400年里是前所未有的。钙化作用随大规模海面温度升高呈线性增加，但对年度温度异常呈非线性反应。下降的原因尚不清楚；然而，这项研究表明，温度压力的增加以及海水文石饱和度的下降可能正在削弱大堡礁珊瑚沉积碳酸钙的能力。
Reef- building corals are under increasing physiological stress from a changing climate and ocean absorption of increasing atmospheric carbon dioxide. We investigated 328 colonies of massive Porites corals from 69 reefs of the Great Barrier Reef ( GBR) in Australia. Their skeletal records show that throughout the GBR, calcification has declined by 14.2% since 1990, predominantly because extension ( linear growth) has declined by 13.3%. The data suggest that such a severe and sudden decline in calcification is unprecedented in at least the past 400 years. Calcification increases linearly with increasing large- scale sea surface temperature but responds nonlinearly to annual temperature anomalies. The causes of the decline remain unknown; however, this study suggests that increasing temperature stress and a declining saturation state of seawater aragonite may be diminishing the ability of GBR corals to deposit calcium carbonate.