Benthic marine calcifiers coexist with CaCO3-undersaturated seawater worldwide
Benthic marine calcifiers coexist with CaCO3-undersaturated seawater worldwide
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DOI：
10.1002/2015gb005260
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发表时间：
2016-07-01
影响因子：
5.2
通讯作者：
McClintock, J. B.
中科院分区：
文献类型：
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作者：
Lebrato, M.;Andersson, A. J.;McClintock, J. B.
海洋酸化和碳酸钙 (CaCO3) 矿物质的海水饱和度下降引起了人们对建造 CaCO3 结构的海洋生物的后果的担忧。大部分底栖海洋钙化物将 Mg2+ 纳入其骨架（镁方解石）中，这通常会降低矿物稳定性。一些海洋钙化剂对海洋酸化的相对脆弱性似乎与其壳或骨骼矿物学的相对溶解度有关，尽管一些生物体具有构建和维持其 CaCO3 结构的复杂机制，导致偏离这种依赖性。然而，在评估海洋酸化对该物种的影响时，很少有研究考虑该物种的实际镁方解石矿物学（（Mg-x））的海水饱和状态。这里，汇集了底栖钙化物的骨骼摩尔百分比 MgCO3 和原位环境条件的全球数据集，跨越 0 米（潮下/浅海）到 5600 米（深海）的深度范围，以进行原位计算 (Mg-x)。该分析表明，所研究的海底钙化物中有 24% 目前经历了海水矿物质不饱和度 ((Mg-x)
Ocean acidification and decreasing seawater saturation state with respect to calcium carbonate (CaCO3) minerals have raised concerns about the consequences to marine organisms that build CaCO3 structures. A large proportion of benthic marine calcifiers incorporate Mg2+ into their skeletons (Mg-calcite), which, in general, reduces mineral stability. The relative vulnerability of some marine calcifiers to ocean acidification appears linked to the relative solubility of their shell or skeletal mineralogy, although some organisms have sophisticated mechanisms for constructing and maintaining their CaCO3 structures causing deviation from this dependence. Nevertheless, few studies consider seawater saturation state with respect to the actual Mg-calcite mineralogy ((Mg-x)) of a species when evaluating the effect of ocean acidification on that species. Here, a global dataset of skeletal mole % MgCO3 of benthic calcifiers and in situ environmental conditions spanning a depth range of 0m (subtidal/neritic) to 5600m (abyssal) was assembled to calculate in situ (Mg-x). This analysis shows that 24% of the studied benthic calcifiers currently experience seawater mineral undersaturation ((Mg-x)