利用养殖的和欧洲自然种群的 Clausilia pumila、Succinella oblonga 和 Trochulus hispidus 进行陆地蜗牛 Δ47 测温

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2024-10-26 DOI:10.1016/j.chemgeo.2024.122461

Gábor Újvári , László Rinyu , Anna Sulikowska-Drozd , Barna Páll-Gergely , Stefano M. Bernasconi

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引用次数: 0

摘要

陆生软体动物霰石壳的团块同位素组成（Δ47）可以从过去 250 万年的黄土-古溶胶记录中定量重建大陆古温度，但这种方法需要在受控实验室条件下并利用自然种群进行测试。在这项研究中，德布勒森（ATOMKI）和苏黎世联邦理工学院实验室测量了广泛分布于欧洲第四纪黄土沉积中的三个物种（Clausilia pumila、Succinella oblonga 和 Trochulus hispidus）的养殖个体和野外采集标本的稳定碳、氧和团块状同位素组成。我们对养殖蜗牛的数据表明，与安德森等人（2021 年）的统一校准相比，这三个物种的蜗牛壳记录的 Δ47 信号接近平衡条件，大部分为正（C. pumila），正/负（T. hispidus），大部分为负（S. oblonga），偏移量约为 0.0158 ± 0.0105 ‰（平均偏移量±1 SD）。从 C. pumila 贝壳得出的钙化温度（TΔ47）与 12、18 和 24 ℃ 的室温非常一致，特别是在 ATOMKI 实验室（平均 T 偏移：2.1 ± 2.2 ℃，1 SD），而其他两个物种的差异较大，约为 5-8 ℃（平均偏移）。野外采集的软体动物的单壳平均 TΔ47 值表明，其生长温度从无霜期到夏季都有，甚至高于夏季最高值。不同气候条件下的自然种群地点可以用干旱指数（AI）进行分组，0.96-1.06 的数值代表无霜期的平均温度（TFFP），0.85-0.91 或 1.14-1.51 的干旱指数反映了夏季或七月的平均温度（TJJA/TJ）。多壳 TΔ47 是通过均质 3-5 个 C. pumila 和 T. hispidus 贝壳材料得到的，在大多数情况下反映了 TJJA。我们观察到这三个物种的贝壳氧同位素组成与海洋性/大陆性有关，大陆性/海洋性较强的地点的氧同位素组成的负值/正值较多，这可能是由于水汽来源距离较远以及大陆内部的降雨导致 18O 消耗所致。此外，体液 δ18O 值（由 δ18Oshell 和 Δ47shell 得出）与季节性降水 δ18O 值的偏差还受额外的温度效应控制，与采集地点的气候区无关，但与单壳 TΔ47 和 TJJA 的具体地点差异共同变化。

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Land snail Δ47 thermometry using cultured and European natural populations of Clausilia pumila, Succinella oblonga and Trochulus hispidus

Clumped isotope composition (Δ₄₇) of aragonitic shells of terrestrial molluscs allow the quantitative reconstructions of continental paleotemperatures from loess-paleosol records of the last 2.5 million years, but it needs testing the method under controlled laboratory conditions and using natural populations. In this study the stable carbon, oxygen and clumped isotope compositions of cultured individuals and field-collected specimens of three species (Clausilia pumila, Succinella oblonga and Trochulus hispidus), widespread in Quaternary loess deposits in Europe, were measured in the Debrecen (ATOMKI) and ETH Zürich laboratories. Our data of cultured snails demonstrate that shells of the three species record Δ₄₇ signatures close to equilibrium conditions with mostly positive (C. pumila), both positive/negative (T. hispidus), and mostly negative (S. oblonga) offsets on the order of 0.0158 ± 0.0105 ‰ (mean offset±1 SD) compared to the Anderson et al. (2021) unified calibration. Calcification temperatures (T_Δ47) derived from C. pumila shells were found to be in excellent agreement with chamber temperatures of 12, 18 and 24 °C, especially in the ATOMKI laboratory (mean T offset: 2.1 ± 2.2 °C, 1 SD), while the other two species exhibited larger discrepancies on the order of 5–8 °C (mean offset). Single shell-based mean T_Δ47 values of field-collected molluscs indicated growth temperatures spanning values from the frost-free period to summer season, or even above summer maxima. The sites of natural populations, characterized by different climate conditions, could be grouped using the aridity index (AI) with values of 0.96–1.06 representing mean temperature of the frost-free period (T_FFP), and AI ranging either from 0.85 to 0.91 or 1.14 to 1.51 reflecting mean summer season or July temperatures (T_JJA/T_J). Multi-shell T_Δ47, obtained by homogenizing the material of 3–5 shells of C. pumila and T. hispidus, reflect T_JJA in most cases. We observed a dependence of the shell oxygen isotope compositions of the three species on oceanity/continentality with more negative/positive values characteristic for more continental/oceanic sites, likely due to moisture source distance and depletion of rainfall in ¹⁸O towards the continental interior. In addition, deviation of body fluid δ¹⁸O values (derived from δ¹⁸O_shell and Δ_47shell) from seasonal precipitation δ¹⁸O is also controlled by an additional temperature effect, being independent of the climate zone of the collection site, but co-varying with the site-specific difference between single shell T_Δ47 and T_JJA.

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.