Effects of seawater pCO2 on the skeletal morphology of massive Porites spp. corals
Effects of seawater pCO2 on the skeletal morphology of massive Porites spp. corals
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DOI：
10.1007/s00227-022-04060-9
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发表时间：
2022-06-01
期刊：
影响因子：
2.4
通讯作者：
Finch, Adrian
中科院分区：
文献类型：
--
作者：
Allison, Nicola;Ross, Phoebe;Finch, Adrian
海洋酸化改变了海水中溶解的无机碳的化学性质，并可能降低热带珊瑚的钙化率。在这里，我们探讨了改变海水pCO（2）对4种基因型的大型滨珊瑚骨骼形态的影响。其显示出非常不同的钙化率。海水pCO（2）的增加会导致所有滨珊瑚骨骼形态的显著变化。无论钙化是否受到海水pCO的显著影响（2）。无论是中位花萼的大小和比例的骨骼表面所占的杯显着下降，在750亩大气压相比，400亩大气压表明，水螅的大小收缩，在这一属在响应海洋酸化。连接花萼的共骨扩大，占据了珊瑚表面的较大比例，以弥补花萼面积的减少。在高海水pCO（2）条件下，4种基因型中有2种沉积在骨骼表面的棘变得更多，骨小梁（垂直骨柱）变得明显变薄。高海水pCO（2）的影响在生长最快的珊瑚中最为明显，并且在这种基因型中，小梁和突触的规则放置受到干扰，导致骨骼组织更加随机。该研究表明，海洋酸化会减小珊瑚虫的大小，并从根本上改变这种来自印度-太平洋的主要珊瑚礁建筑物种的骨架结构。
Ocean acidification alters the dissolved inorganic carbon chemistry of seawater and can reduce the calcification rates of tropical corals. Here we explore the effect of altering seawater pCO(2) on the skeletal morphology of 4 genotypes of massive Porites spp. which display widely different calcification rates. Increasing seawater pCO(2) causes significant changes in in the skeletal morphology of all Porites spp. studied regardless of whether or not calcification was significantly affected by seawater pCO(2). Both the median calyx size and the proportion of skeletal surface occupied by the calices decreased significantly at 750 mu atm compared to 400 mu atm indicating that polyp size shrinks in this genus in response to ocean acidification. The coenosteum, connecting calices, expands to occupy a larger proportion of the coral surface to compensate for this decrease in calyx area. At high seawater pCO(2) the spines deposited at the skeletal surface became more numerous and the trabeculae (vertical skeletal pillars) became significantly thinner in 2 of the 4 genotypes. The effect of high seawater pCO(2) is most pronounced in the fastest growing coral and the regular placement of trabeculae and synapticulae is disturbed in this genotype resulting in a skeleton that is more randomly organised. The study demonstrates that ocean acidification decreases the polyp size and fundamentally alters the architecture of the skeleton in this major reef building species from the Indo-Pacific Ocean.