High-resolution records of growth temperature and life history of two Nacella limpet species, Tierra del Fuego, Argentina

High-resolution records of growth temperature and life history of two Nacella limpet species, Tierra del Fuego, Argentina
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阿根廷火地岛两种 Nacella 帽贝物种的生长温度和生活史的高分辨率记录

DOI:
10.1016/j.palaeo.2019.109526
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发表时间:
2020
期刊:
Palaeoecology
影响因子:
--
通讯作者:
Bas, Maria
Bas, Maria
中科院分区:
--
文献类型:
--
作者:
Nicastro, Adam;Surge, Donna;Briz i Godino, Ivan;Álvarez, Myrian;Schöne, Bernd R.;Bas, Maria

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髌骨帽贝的稳定同位素比率已被确立为北大西洋东部和地中海沿岸亚月分辨率的沿海环境变化的代表。Nacella deaurata (Gmelin 1791) 和 N.magellanica (Gmelin 1791) 是栖息在 Tierra del 海岸的常见髌骨帽贝潮间带物种 阿根廷/智利富埃戈,常见于全新世考古矿床中。在这里,我们检查了现代 N.deaurata 和 N.magellanicato 样本的氧和碳同位素比率(分别为 δ18O 壳层和 δ13C 壳层),并测试以下假设:1)它们在与环境水同位素平衡的情况下形成壳; 2) 每年都会形成显着的生长线。根据 δ18O 壳值的生长裕度分析,我们确定了与预期平衡的 1.3 ± 0.4 ‰ (N. deaurata) 和 1.3 ± 0.3 ‰ (N. magellanica) 的正偏移,与其他髌状帽贝类似。由于观测值和预期值之间的偏移相对一致,因此可以考虑它来可靠地重建生长温度。根据氧同位素时间序列数据估计的海水温度落在观测范围内。因此,N. deaurata 和 N. magellenica 贝壳可以作为沿海海水温度季节性变化的可靠代理档案。所有壳层中 δ13C 壳层值的时间序列均不随季节变化;因此,对其变异的影响需要进一步研究。 δ18Oshelltime 系列背景下的显着生长线的时间每年形成两次,因此不能用于估计寿命。未来对考古舱壳的同位素分析可能会提供南美高纬度地区关于全新世气候变化的急需信息,并有助于我们了解人类行为和人类与气候相互作用。
Stable isotope ratios in patelloid limpets of the genusPatellahave been established as proxies for coastal environmental change at sub-monthly resolution along the eastern North Atlantic and Mediterranean Sea.Nacella deaurata(Gmelin 1791) andN.magellanica(Gmelin 1791) are common intertidal species of patelloid limpets inhabiting the coast of Tierra del Fuego, Argentina/Chile and are commonly found in Holocene archaeological deposits. Here, we examine oxygen and carbon isotope ratios (δ18Oshelland δ13Cshell, respectively) of modern specimens ofN.deaurataandN.magellanicato test the hypotheses that: 1) they form their shells in isotopic equilibrium with ambient water; and 2) prominent growth lines form annually. Based on growth margin analysis of δ18Oshellvalues, we identified a positive offset of 1.3 ± 0.4‰ (N.deaurata) and 1.3 ± 0.3‰ (N.magellanica) from expected equilibrium, similar to other patelloid limpets. Because the offset is relatively consistent between observed and expected values, it can be taken into account to reliably reconstruct growth temperature. Seawater temperature estimated from oxygen isotope time series data falls within the observed range. Thus,N.deaurataandN.magellenicashells serve as reliable proxy archives of seasonal variation in coastal seawater temperature. Time series of δ13Cshellvalues do not vary seasonally in all shells; hence, the influence on its variation requires further study. The timing of prominent growth lines contextualized by the δ18Oshelltime series form twice a year and therefore cannot be used to estimate lifespan. Future isotopic analysis of archaeologicalNacellashells can potentially provide much needed information about Holocene climate change at sub-monthly resolution from high-latitude South American locations, and contribute to our understanding of human behavior and human-climate interactions.
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