Suppression of skeletal growth in scleractinian corals by decreasing ambient carbonate-ion concentration: a cross-family comparison
Suppression of skeletal growth in scleractinian corals by decreasing ambient carbonate-ion concentration: a cross-family comparison
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通过降低环境碳酸根离子浓度抑制石珊瑚骨骼生长：跨科比较
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发表时间：
2003
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通讯作者：
J. Cuif
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作者：
F. Marubini;C. Ferrier‐Pagès;J. Cuif
生物钙化受可用碳酸根离子浓度的影响。近期对造礁珊瑚的这一情况的确认引发了人们对珊瑚礁未来的担忧，因为[CO32−]是大气中pCO2升高的递减函数。由于珊瑚礁最重要的特征之一是其多样性，了解不同物种在应对[CO32−]变化能力上的差异程度是当务之急。我们在“正常”（280微摩尔/千克）和“低”（140微摩尔/千克）碳酸根离子浓度下培养了四种系统发育和生理上不同的造礁珊瑚物种（鹿角珊瑚属的Acropora verweyi、丛生盔形珊瑚Galaxea fascicularis、仙人掌珊瑚Pavona cactus和肾形陀螺珊瑚Turbinaria reniformis）。通过定量（钙化率）和定性（利用扫描电子显微镜（SEM）观察生长的晶体纤维的微观结构外观）研究了对骨骼形成的影响。“低碳酸盐”处理导致钙化率显著降低，并且纤维远端尖端的结晶有减弱的趋势。然而，尽管钙化率在不同物种间受到的影响相同（降低13 - 18%），微观结构反应的程度却具有高度的物种特异性：结晶在Acropora verweyi中受影响最显著，在Turbinaria reniformis中受影响最小。这些结果结合海洋中碳酸盐变化的过去记录和未来预测进行了讨论。
Biogenic calcification is influenced by the concentration of available carbonate ions. The recent confirmation of this for hermatypic corals has raised concern over the future of coral reefs because [CO32−] is a decreasing function of increasing pCO2 in the atmosphere. As one of the overriding features of coral reefs is their diversity, understanding the degree of variability between species in their ability to cope with a change in [CO32−] is a priority. We cultured four phylogenetically and physiologically different species of hermatypic coral (Acropora verweyi, Galaxea fascicularis, Pavona cactus and Turbinaria reniformis) under ‘normal’ (280 mu;mol kg−1) and ‘low’ (140 μmol kg−1) carbonate–ion concentrations. The effect on skeletogenesis was investigated quantitatively (by calcification rate) and qualitatively (by microstructural appearance of growing crystalline fibres using scanning electron microscopy (SEM)). The ‘low carbonate’ treatment resulted in a significant suppression of calcification rate and a tendency for weaker crystallization at the distal tips of fibres. However, while the calcification rate was affected uniformly across species (13–18%reduction), the magnitude of the microstructural response was highly species specific: crystallization was most markedly affected in A. verweyi and least in T. reniformis. These results are discussed in relation to past records and future predictions of carbonate variability in the oceans.