School of Earth Sciences, The University of Western Australia, Crawley, Western Australia, Australia.
Oceans Institute, The University of Western Australia, Crawley, Western Australia, Australia.
Glob Chang Biol. 2019 Feb;25(2):431-447. doi: 10.1111/gcb.14488. Epub 2018 Nov 19.
The processes that occur at the micro-scale site of calcification are fundamental to understanding the response of coral growth in a changing world. However, our mechanistic understanding of chemical processes driving calcification is still evolving. Here, we report the results of a long-term in situ study of coral calcification rates, photo-physiology, and calcifying fluid (cf) carbonate chemistry (using boron isotopes, elemental systematics, and Raman spectroscopy) for seven species (four genera) of symbiotic corals growing in their natural environments at tropical, subtropical, and temperate locations in Western Australia (latitudinal range of ~11°). We find that changes in net coral calcification rates are primarily driven by pH and carbonate ion concentration [ ] in conjunction with temperature and DIC . Coral pH varies with latitudinal and seasonal changes in temperature and works together with the seasonally varying DIC to optimize [ ] at species-dependent levels. Our results indicate that corals shift their pH to adapt and/or acclimatize to their localized thermal regimes. This biological response is likely to have critical implications for predicting the future of coral reefs under CO -driven warming and acidification.
钙化微观位置发生的过程对于理解变化世界中珊瑚生长的反应至关重要。然而，我们对推动钙化的化学过程的机械理解仍在不断发展。在这里，我们报告了对七种共生珊瑚（四个属）在澳大利亚西部热带、亚热带和温带自然环境中生长的钙化率、光生理和钙化液（cf）碳酸盐化学（使用硼同位素、元素系统学和拉曼光谱）的长期原位研究结果（纬度范围约为 11°）。我们发现，净珊瑚钙化率的变化主要是由 pH 值和碳酸盐离子浓度 [ ]与温度和 DIC 共同驱动的。珊瑚 pH 值随温度的纬度和季节性变化而变化，并与季节性变化的 DIC 一起作用，在物种依赖的水平上优化 [ ]。我们的结果表明，珊瑚会改变其 pH 值以适应和/或适应其局部热区。这种生物反应可能对预测在 CO 驱动的变暖酸化下珊瑚礁的未来具有关键意义。
