Abstract Benthic foraminifera assemblages from a sedimentary core (PP10-12; 701 mwd) from the SE Bay of Biscay allow us to trace palaeoceanographic and palaeoclimatic changes occurred in this region during mid MIS 3 (Marine Isotope Stage 3) and MIS 1 interval (37–2.4 ka BP). Results are based on 176 benthic foraminifera species considering their ecology, the difference between autochthonous/allochthonous, preservation and oxygen rates, thus evidencing climatic and oceanographic events. MIS 3 is characterised by waters with a dominance of Cassidulina laevigata and Uvigerina peregrina. By the end of this interval, waters became colder and less oxygenated indicated by the occurrence of Melonis affinis. These conditions persisted at the beginning of MIS 2. The Heinrich Event 1 (H1) is well registered in this core with three intervals (H1a, H1s.s., H1b) where Hyalinea balthica dominates. During H1s.s. the coldest waters are registered, and the environment was unstable. These conditions continued during H1b when the occurrence of Globobulimina affinis evidences some intervals with anoxia. During Bolling-Allerod (B/A) waters were warmer and low-ventilated indicated by Bulimina gibba. Cassidulina laevigata dominates the Younger Dryas (YD) and the beginning of Lower Holocene, evidencing the occurrence of cool waters with low-oxygen and high organic matter content. The Lower to Middle Holocene transition is registered as a cold interval: Holocene Cooling Event (HCE-5). From the Middle Holocene onward water temperature were milder based on the dominance of Uvigerina peregrina.

中文翻译：

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基于底栖有孔虫在比斯开东南湾发现的过去 37,000 年的古海洋学和古气候变化

摘要 来自比斯开东南湾沉积岩心 (PP10-12; 701 mwd) 的底栖有孔虫组合使我们能够追踪在 MIS 3 中期（海洋同位素阶段 3）和 MIS 1 区间（37 –2.4 ka BP）。结果基于 176 种底栖有孔虫物种，考虑了它们的生态、本地/外地之间的差异、保存和氧气率，从而证明了气候和海洋事件。MIS 3 的特点是水域以 Cassiulina laevigata 和 Uvigerina peregrina 为主。到这段时间结束时，Melonis affinis 的出现表明水变得更冷，含氧量减少。这些条件在 MIS 2 开始时持续存在。 Heinrich Event 1 (H1) 在这个核心中很好地记录了三个间隔 (H1a, H1s.s., H1b) 其中 Hyalinea balthica 占主导地位。在 H1s.s. 记录了最冷的水域，环境不稳定。这些条件在 H1b 期间继续存在，当时 Globobulimina affinis 的出现证明了与缺氧的某些间隔。在 Bolling-Allerod (B/A) 期间，Bulimina gibba 表明水温较高且通风不良。Cassidulina laevigata 主导着新仙女木 (YD) 和下全新世的开始，证明存在低氧和高有机质含量的冷水。下至中全新世的转变被记录为冷区间：全新世冷却事件 (HCE-5)。基于 Uvigerina peregrina 的优势，从中全新世开始，水温较温和。这些条件在 H1b 期间继续存在，当时 Globobulimina affinis 的出现证明了与缺氧的某些间隔。在 Bolling-Allerod (B/A) 期间，Bulimina gibba 表明水温较高且通风不良。Cassidulina laevigata 主导着新仙女木 (YD) 和下全新世的开始，证明存在低氧和高有机质含量的冷水。下至中全新世的转变被记录为冷区间：全新世冷却事件 (HCE-5)。基于 Uvigerina peregrina 的优势，从中全新世开始，水温较温和。这些条件在 H1b 期间继续存在，当时 Globobulimina affinis 的出现证明了与缺氧的某些间隔。在 Bolling-Allerod (B/A) 期间，Bulimina gibba 表明水温较高且通风不良。Cassidulina laevigata 主导着新仙女木 (YD) 和下全新世的开始，证明存在低氧和高有机质含量的冷水。下至中全新世的转变被记录为冷区间：全新世冷却事件 (HCE-5)。基于 Uvigerina peregrina 的优势，从中全新世开始，水温较温和。Cassidulina laevigata 主导着新仙女木 (YD) 和下全新世的开始，证明存在低氧和高有机质含量的冷水。下至中全新世的转变被记录为冷区间：全新世冷却事件 (HCE-5)。基于 Uvigerina peregrina 的优势，从中全新世开始，水温较为温和。Cassidulina laevigata 主导着新仙女木 (YD) 和下全新世的开始，证明存在低氧和高有机质含量的冷水。下至中全新世的转变被记录为冷区间：全新世冷却事件 (HCE-5)。基于 Uvigerina peregrina 的优势，从中全新世开始，水温较温和。