Paired Li/Ca and δ18O peaks in bivalve shells from the Gulf of Panama mark seasonal coastal upwelling
Paired Li/Ca and δ18O peaks in bivalve shells from the Gulf of Panama mark seasonal coastal upwelling
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巴拿马湾双壳类贝壳中的成对 Li/Ca 和 δ18O 峰标志着季节性沿海上升流
DOI：
10.1016/j.chemgeo.2019.119295
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Schäfer
中科院分区：
文献类型：
--
作者：
Sadatzki;Alberti;Garbe-Schönberg;Andersen;Fortunato;Andersson;Schäfer
本文测定了热带东太平洋4个文石型Megapitaria aurantiacabibalve贝壳的锂钙（Li/Cashell）和氧同位素（δ 18 Oshell）比值，并评价了它们与季节性海岸上升流的关系。来自上升流主导的巴拿马湾的两个样品的Li/Cashelland δ 18 O壳层具有正相关性，并始终显示出较大的季节变化，分别高达~300 μmol/mol和~3‰。来自邻近的Chiriquí湾非上升流的两个贝壳的Li/Cashelland δ 18 O壳不相关，并且显示出减少的季节变化，很少分别超过20 μmol/mol和~1.0‰。在某些桔小实蝇中，Li/Cashell与生长宽度呈弱正相关，表明生理生长速率效应可能部分控制了“背景”Li/Cashell。非纳米比亚季节性δ 18 Oshell信号，用于精确的年代学从巴拿马湾活采集标本，意味着在Li/Cashelland δ 18 Oshell明显的平行峰标志着寒冷和高产的沿海上升流季节在2月至4月。与环境数据的比较显示，锂/卡谢兰水温之间的负相关性，和强的正相关性之间的锂/卡谢兰叶绿素巴拿马湾。虽然Li/Cashelland温度之间的因果关系仍然不确定，我们认为，Li/Cashellpeaks inM.aurantiacaare与沿海上升流期间以浮游植物为主的浮游植物水华提供的额外Li的概念相一致。我们的研究结果表明，Li/CashellinM.aurantiacamay作为一个新的代理季节性沿海上升流，其潜力应测试其他软体动物物种和上升流地区。
Paired lithium-to-calcium (Li/Cashell) and oxygen isotope (δ18Oshell) ratios were measured in four aragoniticMegapitaria aurantiacabivalve shells from the tropical Eastern Pacific and evaluated with respect to their linkage to seasonal coastal upwelling. The Li/Cashelland δ18Oshellof two specimens from the upwelling-dominated Gulf of Panama are positively correlated and consistently reveal large seasonal variations of up to ~300 μmol/mol and ~3‰, respectively. The Li/Cashelland δ18Oshellof two shells from the adjacent non-upwelling Gulf of Chiriquí are not correlated and show a reduced seasonal variability rarely exceeding 20 μmol/mol and ~1.0‰, respectively. In someM.aurantiacaspecimens the Li/Cashellshows a weak positive correlation with growth increment width, indicating that physiological growth rate effects might in part control the ‘background’ Li/Cashell. Unambiguous seasonal δ18Oshellsignals, used for a precise chronology for a live-collected specimen from the Gulf of Panama, imply that distinct parallel peaks in Li/Cashelland δ18Oshellmark the cold and highly productive coastal upwelling season during February to April. A comparison with environmental data reveals a negative correlation between Li/Cashelland water temperature, and a strong positive correlation between Li/Cashelland chlorophyllain the Gulf of Panama. While a causal link between Li/Cashelland temperature remains uncertain, we argue that Li/Cashellpeaks inM.aurantiacaare consistent with the concept of an incorporation of additional Li provided by diatom-dominated phytoplankton blooms during coastal upwelling. Our findings suggest that Li/CashellinM.aurantiacamay serve as a new proxy for seasonal coastal upwelling, the potential of which should be tested for other mollusk species and upwelling regions.
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