Biologically driven isotope fractionation in ultrastructurally different shell portions of freshwater pearl mussels (Margaritifera margaritifera): Implications for stream water δ18O reconstructions

IF 5.1 2区地球科学 Q1 LIMNOLOGY

Limnology and Oceanography Letters Pub Date : 2024-08-01 DOI:10.1002/lol2.10426

Christoph J. Gey, Laurent Pfister, Guilhem Türk, Frankie Thielen, Loic Leonard, Katharina E. Schmitt, Bernd R. Schöne

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引用次数: 0

Abstract

Oxygen isotopes in stream water can serve as natural tracers of watershed dynamics. Freshwater pearl mussels provide δ18Owater estimates that overcome temporal and spatial limitations of instrumental records. The reliability of shell‐based δ18Owater reconstructions depends on understanding which shell layer biomineralizes closer to oxygen isotopic equilibrium with ambient water. To determine this, both the (outer) prismatic and (inner) nacreous sublayers of the outer shell layer were sampled. Over 2500 isotope values were obtained from shells collected from the Our River (Luxembourg) and from mussels cultured in tanks at constant temperature and monitored δ18Owater. Calculated δ18Owater from the prismatic portion was in excellent agreement with monitored δ18Owater, while δ18Oshell of the nacreous portion was systematically offset by +0.43‰, overestimating δ18Owater by +0.53‰. Although shell portions were formed simultaneously from the same extrapallial fluid, they underwent different fractionation mechanisms, presumably due to differences in carbonic anhydrase activity catalyzing mineralization processes.

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淡水珍珠贻贝（Margaritifera margaritifera）超微结构不同贝壳部分的生物驱动同位素分馏：对溪水δ18O 重建的影响

溪水中的氧同位素可以作为流域动态的天然示踪剂。淡水珍珠贝提供的δ18O 水估计值克服了仪器记录在时间和空间上的局限性。基于贝壳的δ18O 水重建的可靠性取决于了解哪一层贝壳的生物矿化更接近与环境水的氧同位素平衡。为了确定这一点，对外壳层的（外）棱柱状亚层和（内）珍珠质亚层都进行了取样。从渭河（卢森堡）采集的贝壳和在恒温池中养殖的贻贝中获得了 2500 多个同位素值，并对 δ18O 水进行了监测。棱柱部分的δ18O水计算值与监测到的δ18O水非常一致，而珍珠质部分的δ18Oshell则系统地偏移了+0.43‰，高估了δ18O水+0.53‰。虽然贝壳部分是由相同的藻外液同时形成的，但它们经历了不同的分馏机制，这可能是由于催化矿化过程的碳酸酐酶活性不同造成的。

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来源期刊

Limnology and Oceanography Letters Multiple-

CiteScore

10.00

自引率

3.80%

发文量

审稿时长

25 weeks

期刊介绍： Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.