Spatial variability in sulphur isotope values of archaeological and modern cod (Gadus morhua).
Spatial variability in sulphur isotope values of archaeological and modern cod (Gadus morhua).
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DOI：
10.1002/rcm.6682
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
Olaf Nehlich;J. Barrett;M. Richards
中科院分区：
文献类型：
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作者：
Olaf Nehlich;J. Barrett;M. Richards
这项研究提供了现代和考古鳕鱼(Gadus Morhua)骨胶原的第一个硫同位素数据，旨在确定具有重大意义的大范围空间变异性既是人类饮食研究的基准值，也是基于同位素的鱼类贸易研究的潜在变量。方法用弱盐酸溶液从现代和考古鳕鱼骨中提取胶原蛋白，并用同位素比值质谱仪(IRMS)分析其硫同位素组成。结果考古鳕鱼的硫同位素值为+9.1‰~+18.2‰，而现代样品的硫同位素值为+14.8‰~+18.3‰。现代数据显示，与近海捕捞地点一致，淡水影响较小的数值，但也证实了考古证据所显示的一些区域差异。结论与现代人类相比，考古数据的硫同位素值范围较大，可能表明它们来自广泛的地理位置，包括沿海和近海地点。它们显示了区域差异的广泛趋势，这可能与目标鱼类种群(例如“近岸”与“近岸”)和当地生态系统的基准值(例如来自河流系统的淡水输入程度)有关。
RATIONALE This study presents the first sulphur isotope data of modern and archaeological cod (Gadus morhua) bone collagen, undertaken to identify large-scale spatial variability of significance as both baseline values for studies of human diet and a potential variable in isotope-based studies of fish trading. METHODS Collagen was extracted from modern and archaeological cod bones using a weak HCl solution and analysed for its sulphur isotopic composition by isotope ratio mass spectrometry (IRMS). RESULTS The archaeological cod have sulphur isotope values ranging from +9.1‰ to +18.2‰, whereas values for modern specimens range from +14.8‰ to +18.3‰. The modern data show values implying less freshwater influence, consistent with their offshore catch locations, but also corroborate some of the regional variability evident from the archaeological evidence. CONCLUSIONS The archaeological data have a large range of sulphur isotope values compared with the modern populations, probably indicating they were taken from a wide range of geographic locations, including both coastal and offshore locales. They show broad trends of regional difference that may relate to both the fish populations targeted (e.g. 'inshore' versus 'offshore') and the baseline values of the local ecosystem (e.g. degree of freshwater input from river systems).