Corals concentrate dissolved inorganic carbon to facilitate calcification
Corals concentrate dissolved inorganic carbon to facilitate calcification
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DOI：
10.1038/ncomms6741
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发表时间：
2014-12-01
影响因子：
16.6
通讯作者：
Tudhope, Alexander W.
中科院分区：
文献类型：
--
作者：
Allison, Nicola;Cohen, Itay;Tudhope, Alexander W.
溶解无机碳（DIC）的来源，用于生产石珊瑚骨骼不清楚。然而，这一知识对于了解珊瑚生物矿化和评估海洋酸化对珊瑚礁的潜在影响至关重要。在这里，我们使用骨骼硼地球化学重建DIC化学的液体用于珊瑚钙化。我们发现，珊瑚集中DIC在钙化部位大大高于海水值，碳酸氢盐有助于大量的DIC池用于建立骨架。珊瑚主动增加钙化液的pH值，降低DIC以CO2形式存在的比例，并产生扩散梯度，有利于分子CO2从覆盖的珊瑚组织运输到钙化部位。耦合钙化流体pH和[DIC]的增加产生高钙化流体[CO 32-]，并诱导高文石饱和状态，有利于骨架的沉淀。
The sources of dissolved inorganic carbon (DIC) used to produce scleractinian coral skeletons are not understood. Yet this knowledge is essential for understanding coral biomineralization and assessing the potential impacts of ocean acidification on coral reefs. Here we use skeletal boron geochemistry to reconstruct the DIC chemistry of the fluid used for coral calcification. We show that corals concentrate DIC at the calcification site substantially above seawater values and that bicarbonate contributes a significant amount of the DIC pool used to build the skeleton. Corals actively increase the pH of the calcification fluid, decreasing the proportion of DIC present as CO2 and creating a diffusion gradient favouring the transport of molecular CO2 from the overlying coral tissue into the calcification site. Coupling the increases in calcification fluid pH and [DIC] yields high calcification fluid [CO32-] and induces high aragonite saturation states, favourable to the precipitation of the skeleton.