期刊
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷 17, 期 1, 页码 219-231出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GC006182
关键词
stable isotopes; clumped isotopes; land snails; geothermometer; climate seasonality; north China
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB03020500]
- National Basic Research Program of China (973 Program) [2012CB821905]
- National Science Foundation of China [41572163]
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 ((47)) of the shell carbonates. The (47)-derived temperatures for both species revealed a robust correlation with environmental temperatures. Moreover, the temperatures for Cathaica sp. are 3-5 degrees 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 (47) 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.
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