Corals concentrate dissolved inorganic carbon to facilitate calcification

被引:85
作者
Allison, Nicola [1 ]
Cohen, Itay [2 ]
Finch, Adrian A. [1 ]
Erez, Jonathan [3 ]
Tudhope, Alexander W. [4 ]
机构
[1] Univ St Andrews, Dept Earth Sci, St Andrews KY16 9AL, Fife, Scotland
[2] Interuniv Inst Eilat, IL-88103 Elat, Israel
[3] Hebrew Univ Jerusalem, Inst Earth Sci, IL-91904 Jerusalem, Israel
[4] Univ Edinburgh, Grant Inst, Sch Geosci, Edinburgh EH9 3JW, Midlothian, Scotland
[5] Univ Edinburgh, Grant Inst, Edinburgh Ion Microprobe Facil, Edinburgh EH9 3JW, Midlothian, Scotland
来源
NATURE COMMUNICATIONS | 2014年 / 5卷
基金
以色列科学基金会; 英国自然环境研究理事会;
关键词
ISOTOPE FRACTIONATION; SCLERACTINIAN CORALS; PHOTOSYNTHESIS; MECHANISM; ARAGONITE; CALCITE; PERMEABILITY; TEMPERATURE; TRANSPORT; SEAWATER;
D O I
10.1038/ncomms6741
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
引用
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页数:6
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