Neogloboquadrina pachyderma LA-ICP-MS spectral files and stable isotope data from: Geochemical differences between alive, uncrusted and dead, crusted shells of Neogloboquadrina pachyderma: Implications for paleoreconstruction

Planktic foraminiferal-based trace element-calcium ratios (TE/Ca) are a cornerstone in paleoceanographic reconstructions. While TE-environment calibrations are often established through culturing experiments, shell growth in culture is not always consistent with growth in a natural setting. For example, many species of planktic foraminifera thicken their shell at the end of their life cycle, producing a distinct ‘gametogenic’ crust. Crust is common in fossil foraminifers, however, shells grown in culture do not often develop a thick crust. Here we investigate potential vital effects associated with the crusting process by comparing the trace element (Mg/Ca, Na/Ca, Ba/Ca, Sr/Ca, Mn/Ca, Zn/Ca) and stable isotope (δ13C, δ18O) composition of alive, fully mature, uncrusted shells to recently deceased, crusted shells of Neogloboquadrina pachyderma collected from the same plankton tows off the Oregon (USA) coast. We find that uncrusted (N = 55) shells yield significantly higher Ba/Ca, Na/Ca, M...

基于浮游有孔虫（planktic foraminifera）的微量元素-钙比值（TE/Ca）是古海洋重建（paleoceanographic reconstructions）的核心研究手段之一。尽管微量元素-环境校准常通过培养实验确立，但实验室培养下的壳体生长与自然环境中的壳体生长往往并不一致。例如，多数浮游有孔虫物种会在生命周期末期增厚壳体，形成独特的‘配子发生型（gametogenic）’壳层。这类壳层在化石有孔虫中十分常见，但实验室培养得到的壳体却很少形成厚实的壳层。本研究通过对比采自美国俄勒冈州（Oregon）外海同一浮游拖网样品中存活、完全成熟且未结壳的壳体，与同期采集的新近死亡、已结壳的厚壳新拟抱球虫（Neogloboquadrina pachyderma）壳体的微量元素（Mg/Ca、Na/Ca、Ba/Ca、Sr/Ca、Mn/Ca、Zn/Ca）及稳定同位素（δ13C、δ18O）组成，探究壳层形成过程中潜在的生命效应（vital effects）。研究发现，未结壳的壳体（样本量N=55）具有显著更高的Ba/Ca、Na/Ca、M……