Stable and clumped isotopes in shell carbonates of land snails Cathaica sp. and Bradybaena sp. in north China and implications for ecophysiological characteristics and paleoclimate studies
Stable and clumped isotopes in shell carbonates of land snails Cathaica sp. and Bradybaena sp. in north China and implications for ecophysiological characteristics and paleoclimate studies
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DOI：
10.1002/2015gc006182
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发表时间：
2016-01
期刊：
影响因子：
3.7
通讯作者：
Xu Wang;L. Cui;Jixuan Zhai;Z. Ding
中科院分区：
文献类型：
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作者：
Xu Wang;L. Cui;Jixuan Zhai;Z. Ding
了解不同陆地蜗牛物种的生态生理特征对于确定蜗牛动物群落的气候意义至关重要。然而，这方面的工作很少，阻碍了我们利用这些代理指标获得明确的古气候信息。在这里，我们首次记录了 Cathaica sp. 的不同生态生理特征。和布雷迪巴纳 sp。使用贝壳碳酸盐的稳定同位素和聚集同位素 (Δ47) 来研究陆地蜗牛。两个物种的 Δ47 衍生温度显示与环境温度之间存在很强的相关性。此外，Cathaica sp的温度。比 Bradybaena sp. 的温度高 3–5°C。陆地蜗牛，表明这两个物种具有不同的生态生理适应或生长季节。具体来说，Cathaica sp。蜗牛喜欢生活在温暖潮湿的夏季，而布雷迪巴纳 sp。蜗牛在相对凉爽干旱的春季和/或秋季活跃。结果证明了蜗牛壳碳酸盐中的 Δ47 作为季风地区有前途的古温度计，并为这些陆地蜗牛物种的古气候解释提供了新的见解。这一发现凸显了气候季节性在陆地蜗牛动物群落变化中的重要性。
Knowledge of ecophysiological characteristics of different land snail species is crucial for defining climatic significance of snail faunal assemblages. However, little work has been done in this aspect, hindering our obtaining unambiguous paleoclimatic information using these proxy indicators. Here we document for the first time the different ecophysiological characteristics of Cathaica sp. and Bradybaena sp. land snails using the stable isotopes and clumped isotope (Δ47) of the shell carbonates. The Δ47‐derived temperatures for both species revealed a robust correlation with environmental temperatures. Moreover, the temperatures for Cathaica sp. are 3–5°C higher than those for Bradybaena sp. land snails, indicating different ecophysiological adaptations or growing seasons of the two species. Specifically, Cathaica sp. snails prefer living in a warm‐humid summer, whereas Bradybaena sp. snails are active in the relatively cool‐arid spring and/or autumn. The result testifies to the Δ47 in snail shell carbonates as a promising paleothermometer in monsoonal region and presents new insight into paleoclimatic explanation of these land snail species. This finding highlights the importance of climatic seasonality in the changes of the faunal assemblages of land snails.