Gulf of Maine bulk and amino acid nitrogen isotope data from 1783-2010 measured from Arctica islandica shells

The data presented here are bulk and amino acid nitrogen isotopes and amino acid concentrations measured in Arctica islandica shells collected from the Gulf of Maine between 2009 and 2014. The samples are dated between 1783 and 2010 C.E. using cross-dating techniques. Three different tissue types were analyzed: periostracum, calcium carbonate shell, and adductor muscle. Carbon isotopes of periostracum are also presented. Isotope data were analyzed using an isotope ratio mass spectrometer coupled with a Gas Chromatograph and an Elemental Analyzer for amino acid and bulk analyses, respectively. Amino acid concentration data were analyzed using a Flame Ionization Detector and concentration curves. Trophic position of Arctica islandica through time was determined using a trophic position equation gleaned from the literature.

本数据集收录了2009至2014年间于缅因湾（Gulf of Maine）采集的冰岛北极蛤（Arctica islandica）壳体样品的块体氮同位素、氨基酸氮同位素及氨基酸浓度数据。所有样品通过交叉定年技术确定其年代范围为公元1783年至2010年。本次分析涵盖三类组织样品：壳质层（periostracum）、碳酸钙壳体与闭壳肌，同时附带壳质层的碳同位素数据。同位素数据分别采用同位素比值质谱仪（isotope ratio mass spectrometer）联用气相色谱仪（Gas Chromatograph，用于氨基酸分析）与元素分析仪（Elemental Analyzer，用于块体分析）完成检测；氨基酸浓度数据则通过火焰离子化检测器（Flame Ionization Detector）结合浓度校准曲线进行分析。本研究借助文献中提取的营养级计算公式，重建了冰岛北极蛤随时间变化的营养级动态。