CARBON AND OXYGEN ISOTOPE COMPOSITION OF SHELL CARBONATE OF DESERT LAND SNAILS
CARBON AND OXYGEN ISOTOPE COMPOSITION OF SHELL CARBONATE OF DESERT LAND SNAILS
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DOI：
10.1016/0012-821x(87)90234-2
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发表时间：
1987-12-01
影响因子：
5.3
通讯作者：
MAGARITZ, M
中科院分区：
文献类型：
--
作者：
GOODFRIEND, GA;MAGARITZ, M
沿着气候梯度在半干旱到干旱地区在地中海南部的几种陆地蜗牛壳碳酸盐中的13 C/12 C和18 O/16 O比值的变化进行了研究。13 C被发现是丰富的蜗牛从社区有植物与C4光合途径。在年平均降雨量高的地区，δ 13 C值明显减少，这显然是由于蜗牛活动增加导致代谢CO2的输入增加。贝壳碳酸盐δ 18 O值与雨水δ 18 O值的相关性较弱。相对于与环境沃茨的同位素平衡，贝壳δ 18 O值富集2-8‰。富集被认为是由于代谢对身体水分的影响（较低的活动产生更大的富集），但蒸发也可能是一个因素。13 C和18 O在物种间存在一致的差异，这可能与贝壳沉积发生的时间有关。与大多数古环境指标一样，贝壳同位素的应用由于同位素组成的多重控制而变得复杂。
Variation in13C/12C and18O/16O ratios in the shell carbonate of several species of land snails was studied along a climatic gradient in semi-arid to arid areas in the southern Levant.13C was found to be enriched in snails from communities having plants with a C4photosynthetic pathway. Depleted δ13C values were found in areas with high mean annual rainfall, apparently due to higher input of metabolic CO2as a result of greater snail activity. Shell carbonate δ18O values show a weak relation to the δ18O values of rainwater. The shell δ18O values are enriched by 2–8‰ relative to isotopic equilibrium with environmental waters. Enrichment is suggested to result from metabolic effects on body water (with lower activity producing greater enrichment) but evaporation could also be a factor. Consistent differences in both13C and18O were found among species and may relate to the time when shell deposition occurs. As with most paleoenvironmental indicators, the application of shell isotopes is complicated by the multiplicity of controls of isotopic composition.