Resolving the interactions of ocean acidification and temperature on coral calcification media pH
Resolving the interactions of ocean acidification and temperature on coral calcification media pH
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DOI：
10.1007/s00338-021-02170-2
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发表时间：
2021-08-18
期刊：
影响因子：
3.5
通讯作者：
Finch, Adrian
中科院分区：
文献类型：
--
作者：
Allison, Nicola;Cole, Catherine;Finch, Adrian
海洋酸化通常会降低大量孔隙珊瑚的钙化率，但提高海水温度（低于压力和漂白阈值）可以抵消这种影响。在这里，我们使用delta B-11重建了用于沉淀多孔珊瑚骨架的钙化介质（pH(ECM)）的pH值，这些介质在海水pCO(2)和25℃和28℃的范围内培养。在高pCO(2)下，温度升高对pH（ECM）没有显著影响，尽管珊瑚的钙化率增加了。虽然钙化率保持不变，但在28℃时的pH值（ECM）比在25℃时的低海水pCO(2)要低。钙化率的增加可能反映了温度对文石沉淀率的积极影响，钙化介质饱和状态的增加或骨骼有机基质浓度/行为的变化。本研究中使用的两种温度在珊瑚收集点的季节范围内，并不代表热应激情景。海水温度升高可能会在未来促进某些珊瑚的钙化，但不太可能对大多数珊瑚有利，因为它们的生活已经接近其最高耐热极限。
Ocean acidification typically reduces the calcification rates of massive Porites spp. corals, but increasing seawater temperatures (below the stress and bleaching threshold) can offset this effect. Here, we use delta B-11 to reconstruct the pH of the calcification media (pH(ECM)) used to precipitate the skeleton in poritid corals cultured over a range of seawater pCO(2) and at 25 degrees C and 28 degrees C. Increasing temperature had no significant effect on pH(ECM) at high pCO(2) although corals increased their calcification rates. pH(ECM) was reduced at 28 degrees C compared to 25 degrees C at low seawater pCO(2), although calcification rates remained constant. Increasing calcification rates could reflect the positive influence of temperature on aragonite precipitation rate, an increase in calcification media saturation state or a change in the concentration/behaviour of the skeletal organic matrix. The two temperatures utilized in this study were within the seasonal range at the coral collection site and do not represent a heat stress scenario. Increasing seawater temperatures may promote calcification in some corals in the future but are unlikely to benefit the majority of corals, which are already living close to their maximum thermal tolerance limits.