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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Influences of coral genotype and seawater pCO(2) on skeletal Ba/Ca and Mg/Ca in cultured massive Porites spp. corals
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Influences of coral genotype and seawater pCO(2) on skeletal Ba/Ca and Mg/Ca in cultured massive Porites spp. corals

机译：珊瑚基因型和海水PCO（2）对培养型Porites SPP骨骼BA / Ca和Mg / Ca的影响。 珊瑚

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摘要

Coral skeletal Ba/Ca is a proxy for seawater Ba/Ca, used to infer oceanic upwelling and terrigenous runoff while [Mg2+] is implicated in the control of coral biomineralisation. We cultured large individuals (12 cm diameter) of 3 genotypes of massive adult Porites spp. corals over a range of seawater pCO(2) to test how atmospheric CO2 variations affect skeletal Ba/Ca and Mg/Ca. We identified the skeleton deposited after a 5 month acclimation period and analysed the skeletal Ba/Ca and Mg/Ca by secondary ion mass spectrometry. Skeletal Mg/Ca varies significantly between some duplicate colonies of the same coral genotype hampering identification of genotype and seawater pCO(2) effects. Coral aragonite:seawater Ba/Ca partition coefficients (K-D Ba/Ca) do not vary significantly between duplicate colonies of the same coral genotype. We observe large variations in K-D Ba/Ca between different massive Porites spp. coral genotypes irrespective of seawater pCO(2). These variations do not correlate with coral calcification, photosynthesis or respiration rates or with skeletal K-D Mg/Ca or K-D Sr/Ca. Seawater pCO(2) does not significantly affect K-D Ba/Ca in 2 genotypes but K-D Ba/Ca is significantly higher at 750 atm seawater pCO(2) than at 180 mu atm in 1 P. lutea genotype. Genotype specific variations in K-D Ba/Ca between different Porites spp. could yield large errors (similar to 250%) in reconstructions of seawater Ba when comparing Ba/Ca between corals. Analysis of fossil coral specimens deposited at low seawater pCO(2), may underestimate past seawater Ba/Ca and ocean upwelling/freshwater inputs when compared with modern specimens but the effect is small in comparison with the observed difference between coral genotypes.
机译：珊瑚骨架Ba/Ca是海水Ba/Ca的替代物，用于推断海洋上升流和陆源径流，而[Mg2+]与珊瑚生物矿化的控制有关。我们在一系列海水pCO（2）中培养了3种基因型的大型成年多孔珊瑚个体（直径>12 cm），以测试大气CO2变化如何影响骨骼Ba/Ca和Mg/Ca。我们鉴定了5个月驯化期后沉积的骨骼，并通过二次离子质谱分析了骨骼Ba/Ca和Mg/Ca。同一珊瑚基因型的一些重复菌落之间的骨骼镁/钙显著不同，阻碍了基因型和海水pCO（2）效应的识别。珊瑚文石：海水Ba/Ca分配系数（K-D Ba/Ca）在相同珊瑚基因型的重复群体之间没有显著差异。我们观察到，无论海水pCO（2）如何，不同的大孔雀石珊瑚基因型之间的K-D Ba/Ca存在较大差异。这些变化与珊瑚钙化、光合作用或呼吸速率或骨骼K-D Mg/Ca或K-D Sr/Ca无关。海水pCO（2）对两种基因型的K-D Ba/Ca没有显著影响，但在750 atm海水pCO（2）下，K-D Ba/Ca显著高于180 mu atm下的1 P.lutea基因型。当比较珊瑚之间的Ba/Ca时，不同多孔菌属之间K-D Ba/Ca的基因型特异性差异可能会在海水Ba的重建中产生较大的误差（类似于250%）。与现代标本相比，在低海水pCO（2）下沉积的化石珊瑚标本的分析可能低估了过去的海水Ba/Ca和海洋上升流/淡水输入，但与观察到的珊瑚基因型差异相比，影响很小。

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