Multiscale mechanical consequences of ocean acidification for cold-water corals.
Multiscale mechanical consequences of ocean acidification for cold-water corals.
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DOI：
10.1038/s41598-022-11266-w
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发表时间：
2022-05-16
影响因子：
4.6
通讯作者：
Hennige, Sebastian J.
中科院分区：
文献类型：
--
作者：
Wolfram, Uwe;Fernandez, Marta Pena;McPhee, Samuel;Smith, Ewan;Beck, Rainer J.;Shephard, Jonathan D.;Ozel, Ali;Erskine, Craig S.;Buscher, Janina;Titschack, Jurgen;Roberts, J. Murray;Hennige, Sebastian J.
海洋酸化对深海珊瑚构成威胁，并可能导致它们所建立的珊瑚礁框架栖息地急剧而迅速地丧失。珊瑚礁框架结构关键部分的削弱可能导致生态系统范围内的物理栖息地崩溃，从而降低支持生物多样性的潜力。珊瑚崩溃和崩溃的机制可以通过实验室规模的实验以及数学和计算模型的结合来描述。我们综合了来自电子背散射衍射、微型计算机断层扫描和微观机械实验的数据，并辅以分子动力学和连续微观力学模拟，以预测珊瑚结构在孔隙度和溶解度增加的情况下的失效。结果表明，冷水珊瑚骨架建筑材料具有 462 MPa 的抗压强度和 45–67 GPa 的刚度，具有卓越的机械性能。它的强度是混凝土的 10 倍，是超高性能纤维增强混凝土或珍珠质的两倍。与预期相反，即使在未来的海洋条件下合成，CWC 仍保留其骨骼建筑材料的强度，尽管其刚度有所损失。由于这是在材料长度尺度上，因此它与因暴露于腐蚀性水或生物侵蚀而增加的孔隙率无关。然后，我们的模型说明了孔隙度的微小增加如何导致珊瑚栖息地崩溃的风险显着增加。这一新的认识，加上对未来几十年海水化学变化的预测，将通过确定哪些生态系统面临风险以及何时面临风险，从而评估对相关生物多样性的影响，从而有助于支持这些脆弱海洋生态系统未来的保护和管理工作。
Ocean acidification is a threat to deep-sea corals and could lead to dramatic and rapid loss of the reef framework habitat they build. Weakening of structurally critical parts of the coral reef framework can lead to physical habitat collapse on an ecosystem scale, reducing the potential for biodiversity support. The mechanism underpinning crumbling and collapse of corals can be described via a combination of laboratory-scale experiments and mathematical and computational models. We synthesise data from electron back-scatter diffraction, micro-computed tomography, and micromechanical experiments, supplemented by molecular dynamics and continuum micromechanics simulations to predict failure of coral structures under increasing porosity and dissolution. Results reveal remarkable mechanical properties of the building material of cold-water coral skeletons of 462 MPa compressive strength and 45–67 GPa stiffness. This is 10 times stronger than concrete, twice as strong as ultrahigh performance fibre reinforced concrete, or nacre. Contrary to what would be expected, CWCs retain the strength of their skeletal building material despite a loss of its stiffness even when synthesised under future oceanic conditions. As this is on the material length-scale, it is independent of increasing porosity from exposure to corrosive water or bioerosion. Our models then illustrate how small increases in porosity lead to significantly increased risk of crumbling coral habitat. This new understanding, combined with projections of how seawater chemistry will change over the coming decades, will help support future conservation and management efforts of these vulnerable marine ecosystems by identifying which ecosystems are at risk and when they will be at risk, allowing assessment of the impact upon associated biodiversity.
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影响因子：
5.2
作者：
Altay, E.;Shahwan, T.;Tanoglu, M.
通讯作者：
Tanoglu, M.
影响因子：
3.9
作者：
BENVENISTE, Y
通讯作者：
BENVENISTE, Y
影响因子：
3.1
作者：
Fisler, DK;Gale, JD;Cygan, RT
通讯作者：
Cygan, RT
DOI：
10.1098/rsta.2010.0005
发表时间：
2010-04-28
影响因子：
5
作者：
Fritsch, Andreas;Hellmich, Christian;Dormieux, Luc
通讯作者：
Dormieux, Luc
影响因子：
2
作者：
Fritsch, Andreas;Hellmich, Christian;Dormieux, Luc
通讯作者：
Dormieux, Luc