A 200-year archaeozoological record of Pacific cod ( Gadus macrocephalus ) life history as revealed through ion microprobe oxygen isotope ratios in otoliths
A 200-year archaeozoological record of Pacific cod ( Gadus macrocephalus ) life history as revealed through ion microprobe oxygen isotope ratios in otoliths
复制标题
通过离子微探针耳石中的氧同位素比率揭示了太平洋鳕鱼 (Gadus macrocephalus) 200 年生活史的考古动物学记录
DOI：
10.1016/j.jasrep.2017.06.037
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Valley, John W.
中科院分区：
文献类型：
--
作者：
Helser, Thomas;Kastelle, Craig;Crowell, Aron;Ushikubo, Takayuki;Orland, Ian J.;Kozdon, Reinhard;Valley, John W.
利用高精度离子微探针对美国阿拉斯加州基奈半岛太平洋沿岸Aialik湾现代和考古太平洋鳕鱼耳石中的δ 18 O值进行了测量。从耳石核心到耳石边缘沿2-3 mm的断面，在沿着60个10 μm的点上测定了δ 18 O值，具有较高的逐点分析精度（δ 18 O ± 0.3‰）。我们获得的样品密度沿着的线性横断面，至少2至3倍以上的微磨/传统的质谱技术。利用电子档案中的温度数据，对现代太平洋鳕鱼耳石中文石δ 18 O与海水温度的经验分馏方程（r2= 0.75，p < 0.001，δ 18 OA = 2.13- 0.25 T °C）进行了校正，并据此预测了阿拉斯加湾（果阿）鱼类生活史和历史近岸水温的温度场。δ 18 O值沿沿着核心边缘断面的弯曲变化可能反映了季节性温度变化，并建议现代和考古鳕鱼之间的寿命相似。从耳石核心区域到边缘的δ 18 O值普遍增加，表明在生命的第一年从温暖的近岸栖息地到较冷的较深沃茨的个体发育迁移，这种行为在过去200年中没有改变。从考古（~ 200 +，~ 100 +年前，YBP）到现代耳石的平均δ 18 O下降表明从小冰期晚期到现在的海面温度上升。根据文石中的δ 18 O计算的温度表明，在过去200年里，果阿沿海海洋表面温度上升了2-3 °C。土著生计资源的使用和定居模式的影响进行了讨论，根据果阿水温和生物制度的重大转变。
We measuredδ18O values in modern and archaeological Pacific cod (Gadus macrocephalus) otoliths recovered from Aialik Bay on the Pacific coast of the Kenai Peninsula, Alaska, using a high precision ion microprobe. Values ofδ18O were measured in as many as sixty 10-μm spots along 2–3 mm transects from the otolith core to its margin with high spot-to-spot analytical precision (δ18O ± 0.3‰). We obtained sample densities along a linear transect that were at least 2 to 3 times greater than micromilling/conventional mass spectrometry techniques. From modern Pacific cod otoliths (usingin situtemperatures from electronic archive tags) we calibrated an empirical fractionation equation of aragoniteδ18O to sea water temperature (r2= 0.75,p< 0.001,δ18OA= 2.13–0.25T°C) and from which we predicted the thermography of fish life history and historic nearshore water temperature in the Gulf of Alaska (GOA). Sinuous variability ofδ18O values along core-to-margin transects likely reflect seasonal temperature changes and suggest similar longevity between modern and archaeological cod. Generally increasingδ18O values from the otolith core region to the margin revealed an ontogenetic migration from warmer nearshore habitat during the first year of life to cooler deeper waters at later ages, a behavior that has not changed over the past 200 years. A decline in the averageδ18O of otolith cores from archaeological (~ 200 +, ~ 100 + years before present, YBP) to modern otoliths suggest increasing sea surface temperatures from the late Little Ice Age to present. Temperatures calculated from theδ18O in aragonite suggest a 2–3 °C rise in coastal marine sea surface temperatures in the GOA over the last 200 years. Implications of indigenous subsistence resource use and settlement patterns are discussed in light of major shifts in GOA water temperatures and biological regimes.