Equilibrated clumped isotope signatures of land-snail shells observed from laboratory culturing experiments and its environmental implications
Equilibrated clumped isotope signatures of land-snail shells observed from laboratory culturing experiments and its environmental implications
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DOI：
10.1016/j.chemgeo.2018.05.001
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发表时间：
2018-06
期刊：
影响因子：
3.9
通讯作者：
Naizhong Zhang;Keita Yamada;A. Kano;R. Matsumoto;N. Yoshida
中科院分区：
文献类型：
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作者：
Naizhong Zhang;Keita Yamada;A. Kano;R. Matsumoto;N. Yoshida
本研究报告了在20 °C至30 °C的已知温度范围内沉淀的陆地蜗牛壳的团块同位素值（Δ47）。我们观测到的贝壳Δ47values属于已发表的Δ47-T校准线的不确定度（例如Kelson et al., 2017），说明蜗牛贝壳文石是以块状同位素平衡沉淀的，没有明显的Δ47vital效应。Δ47data与不同的体同位素输入源（δ13C和δ18O）无关，这是由于食物和水供应的差异造成的；它们也与摄入的碳酸盐成分或蜗牛的生长速度无关。此外，我们初步采用Δ47-T校准（Kelson et al., 2017）计算亲本螺的平均生长温度。结果表明，在环境参数最优的条件下，陆地蜗牛壳的团块同位素值可作为重建蜗牛活动季节平均温度的有用工具。未来的研究应关注这种关系在蜗牛自我保存或适应机制更为复杂的自然环境中的适用性。
This study reports on the clumped isotope values (Δ47) of land-snail shells precipitated at known temperatures ranging from 20 °C to 30 °C. Our observed shell Δ47values fall into the uncertainties of published Δ47–T calibration line (e.g. Kelson et al., 2017), indicating the shell aragonite of land snails is precipitated at clumped isotopic equilibrium without an obvious Δ47vital effect. The Δ47data are neither related to the various bulk isotopic input sources (both for δ13C and δ18O) which result from differences in the supplied food and water; nor are they related to the ingested carbonate composition or snail growth rate. Furthermore, we preliminarily applied the Δ47–T calibration (Kelson et al., 2017) to calculate the mean growth temperatures of the parent snails. Results suggest that the clumped isotope values for land-snail shells can be regarded as a useful tool to reconstruct the mean seasonal temperature of snail activity when the environmental parameters are optimum. Future studies should focus on the applicability of this relationship to snails in natural environments where the self-preservation or acclimatization mechanisms are more complex.