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首页> 外文期刊>Geochemistry, geophysics, geosystems >Thermal dependency of shell growth, microstructure, and stable isotopes in laboratory-reared Scapharca broughtonii (Mollusca: Bivalvia)
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Thermal dependency of shell growth, microstructure, and stable isotopes in laboratory-reared Scapharca broughtonii (Mollusca: Bivalvia)

机译：实验室饲养的Scapharcabondonii（软体动物：双壳纲）中壳的生长，微观结构和稳定同位素的热依赖性

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摘要

We experimentally examined the growth, microstructure, and chemistry of shells of the bloody clam, Scapharca broughtonii (Mollusca: Bivalvia), reared at five temperatures (13, 17, 21, 25, and 29 degrees C) with a constant pCO(2) condition (approximate to 450 atm). In this species, the exterior side of the shell is characterized by a composite prismatic structure; on the interior side, it has a crossed lamellar structure on the interior surface. We previously found a negative correlation between temperature and the relative thickness of the composite prismatic structure in field-collected specimens. In the reared specimens, the relationship curve between temperature and the growth increment of the composite prismatic structure was humped shaped, with a maximum at 17 degrees C, which was compatible with the results obtained in the field-collected specimens. In contrast, the thickness of the crossed lamellar structure was constant over the temperature range tested. These results suggest that the composite prismatic structure principally accounts for the thermal dependency of shell growth, and this inference was supported by the finding that shell growth rates were significantly correlated with the thickness of the composite prismatic structure. We also found a negative relationship between the rearing temperature and O-18 of the shell margin, in close quantitative agreement with previous reports. The findings presented here will contribute to the improved age determination of fossil and recent clams based on seasonal microstructural records.
机译：我们通过实验检查了血c蛤S的生长，微观结构和化学性质，该five蛤在五个温度下（13、17、21、25和29摄氏度）于恒定pCO（2）下饲养（2）条件（约450 atm）。在该物种中，壳的外侧具有复合棱柱结构的特征;在内部，它在内部表面上具有交叉的层状结构。我们先前在野外采集的样本中发现温度与复合棱柱结构的相对厚度之间存在负相关关系。在饲养的标本中，温度与复合棱柱形结构的生长增量之间的关系曲线呈驼峰状，最大值在17摄氏度时与实地采集的标本相符。相反，交叉层状结构的厚度在测试的温度范围内是恒定的。这些结果表明，复合棱柱结构主要考虑了壳生长的热依赖性，并且这一发现得到了以下结论的支持：壳生长速率与复合棱柱结构的厚度显着相关。我们还发现饲养温度与壳缘的O-18之间存在负相关关系，与先前的报道在数量上有着密切的一致性。根据季节性的微结构记录，这里提出的发现将有助于改善化石和新近蛤的年龄确定。

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