CORAL SKELETAL CHEMISTRY - PHYSIOLOGICAL AND ENVIRONMENTAL REGULATION OF STABLE ISOTOPES AND TRACE-METALS IN MONTASTREA-ANNULARIS
CORAL SKELETAL CHEMISTRY - PHYSIOLOGICAL AND ENVIRONMENTAL REGULATION OF STABLE ISOTOPES AND TRACE-METALS IN MONTASTREA-ANNULARIS
复制标题
DOI：
10.1098/rspb.1977.0042
复制
发表时间：
1977-01-01
期刊：
影响因子：
--
通讯作者：
GOREAU, TJ
中科院分区：
文献类型：
--
作者：
GOREAU, TJ
本文研究了两年来有环境资料的珊瑚骨骼中~(13)C、~(18)O、Ca、Mg、St和Fe的含量。~(13)C和~(13)Mg含量有较强的季节变化。这些似乎与增长率的变化有关，应在今后的工作中加以考虑。~(18)O含量未表现出平衡的物理化学温度效应，与~(13)C缺乏相关性，表明代谢同位素分馏复杂。锶含量变化不大。这种与镁的差异是基于生化离子传输的基础上预测的。铁的成因是碎屑。珊瑚骨骼中痕量组分的季节记录与前人预测的不同，表明在碳酸盐骨骼化学的古环境解释中，代谢效应不能被忽视。稳定同位素是了解光合作用钙化生物整体碳代谢的有用工具。建立了碳同位素分馏模型，并对光合作用和钙化作用中使用的碳源进行了界定。C Supply.apprx的。40%来自海水重碳酸盐，60%来自回收的呼吸二氧化碳。
The 13C, 18O, Ca, Mg, St and Fe contens of a coral skeleton deposited during a 2-yr period for which environmental data were available, were studied. Strong seasonal variations in 13C and Mg contents were found. These appear to be linked to changes in growth rate, and should be considered in future work. 18O content did not show equilibrium physicochemical temperature effects, and its lack of correlation with 13C indicated complex metabolic isotope fractionation. Sr content showed little variation. This difference from Mg was predicted on grounds of biochemical ion transport. Fe was detrital in origin. Seasonal records of trace constituents in coral skeleton differed from those predicted by previous investigators, indicating that metabolic effects cannot be ignored in paleoenvironmental interpretation of carbonate skeletal chemistry. Stable isotopes were useful tools in understanding overall carbon metabolism of photosynthetic calcifying organisms. A model of C isotope fractionation was developed, and used to place bounds on the sources of C used in photosynthesis and calcification. Of the C supply .apprx. 40% was from seawater bicarbonate and 60% from recycled respiratory CO2.