In response to modern global warming and climate emergency, large oxygen-depleted oceanic areas, known as Oxygen Minimum Zones (OMZs) have been expanding for the past decades, with negative ecological and economic consequences on food chains, marine ecosystems and resources, biodiversity, and fisheries. The future evolution of these areas and their expansion for the next decades and centuries remain uncertain, and information on their past behaviour during intervals of abrupt climate change (e.g. the last Glacial / Interglacial cycles) is needed to understand the biological and physical mechanisms involved.

In this study, a new approach to quantitatively reconstruct past bottom water oxygenation (BWO) was developed, based on the relative abundance of a single benthic foraminiferal species: Eubuliminella exilis (Cushman 1927). A taxonomic review as well as a systematic revision of this taxa, previously assigned to the genus Buliminella Cushman 1911, and synonymised with Eubuliminella exilis (Brady 1884), was also carried out.

The method was calibrated using 25 core tops recovered from the Western North Pacific (WNP), the Eastern North Pacific (ENP), the Eastern Equatorial Pacific (EEP), Eastern South Pacific (ESP) and the Arabian Sea (AS) OMZs. It was then applied to five cores from the WNP, and ENP OMZs. Data show a similar and consistent relationship with past [O₂] values estimated by using the assemblages method developed in previous studies. We thus propose that the relative abundance of Eubuliminella tenuata (Cushman 1927) could be used as a global proxy for estimating past dissolved oxygenation.

为应对现代全球变暖和气候紧急情况，在过去几十年中，被称为最低氧气区 (OMZ) 的大片缺氧海洋区域一直在扩大，对食物链、海洋生态系统和资源、生物多样性、和渔业。这些地区的未来演变及其在未来几十年和几个世纪的扩张仍然不确定，需要了解它们在突然气候变化间隔（例如最后一次冰期/间冰期循环）期间的过去行为信息，以了解所涉及的生物和物理机制。

在这项研究中，基于单一底栖有孔虫物种的相对丰度，开发了一种定量重建过去底水氧合 (BWO) 的新方法：Eubiliminella exilis (Cushman 1927)。还对该分类群进行了分类学审查和系统修订，该分类群先前被归入 Buliminella Cushman 1911属，并与Eubiliminella exilis (Brady 1884)同义。

该方法使用从西北太平洋 (WNP)、东北太平洋 (ENP)、东赤道太平洋 (EEP)、东南太平洋 (ESP) 和阿拉伯海 (AS) OMZ 回收的 25 个岩芯顶部进行校准。然后将其应用于 WNP 和 ENP OMZ 的五个核心。数据显示了与过去 [O ₂ ] 值的类似和一致关系，这些值是使用先前研究中开发的组合方法估计的。因此，我们建议Eubuliminella tenuata (Cushman 1927)的相对丰度可用作估算过去溶解氧的全球代理。