Evaluating tooth strontium and barium as indicators of weaning age in Pacific walruses

A dataset of calcium-normalized 88Sr and 137Ba concentrations from laser ablation transects across the cementum layer of 107 (female: n = 84, male: n = 23) Pacific walrus (Odobenus rosmarus divergens) teeth. Dataset includes spreadsheets containing elapsed time of laser ablation transect in seconds (ElapsedTime_s; laser transect speed = 5μm/s), calcium-normalized strontium concentrations (Sr_ppm_m88; values below limit of detection replaced with 1/2*limit of detection, see methods), and calcium-normalized barium concentrations (Ba_ppm_m137; values below limit of detection replaced with 0.5*limit of detection). Photos (in .tif format) of tooth cementum used to estimate the positions of cementum growth layer groups are included for each animal. For teeth where more than one laser ablation scar is visible in the photo, an arrow is included to indicate the laser ablation scar that corresponds with the included trace element data. Finally, a Word document containing metadata (Catalog Number/...

本数据集涵盖通过激光剥蚀断面穿过107头（雌性n=84，雄性n=23）太平洋海象（Odobenus rosmarus divergens）牙骨质层所获得的经钙标准化处理的88锶（88Sr）与137钡（137Ba）浓度数据。数据集包含三类电子表格：其一为激光剥蚀断面耗时（单位：秒，字段名：ElapsedTime_s；激光断面移动速度为5μm/s）；其二为钙标准化锶浓度（Sr_ppm_m88；检出限以下的数值替换为1/2倍检出限，详见方法部分）；其三为钙标准化钡浓度（Ba_ppm_m137；检出限以下的数值替换为0.5倍检出限）。所有个体均附带用于估算牙骨质生长层组位置的牙骨质照片（格式为.tif）。若单颗牙齿的照片中可见多处激光剥蚀痕迹，则会通过箭头标注与所附微量元素数据对应的激光剥蚀痕迹。最后，本数据集附带一份包含元数据的Word文档（目录编号/……