Abstract In north-western Europe, continental records of Pleistocene interglacials are well preserved in fluvial sequences and particularly within calcareous tufas that formed at the top of the series. They are the sole deposits recording the full optima. Tufas contain rich malacological communities that allow the detailed palaeoenvironmental history of past interglacials to be reconstructed. Several tufas have been investigated in the study area, which have led to the recognition of the « Lyrodiscus fauna » as a characteristic biostratigraphical signature of tufa sequences of MIS 11 age in north-western Europe. Among these, the site at La Celle in the Seine valley (France) is the only one where tufa has accumulated a substantial thickness (almost 9 m) in which the complete development of the Lyrodiscus fauna is represented, yielding a detailed record of the forest expansion during the MIS 11 interglacial. The La Celle succession therefore provides a regional framework into which other sequences can be set, shedding lights on various aspects of palaeoenvironmental dynamics, biostratigraphy, palaeogeography and palaeobiodiversity. Combined malacological and isotopic records from La Celle demonstrate a close correlation between increasing temperatures and the development of forest land snail communities. The palaeoecological framework of forest extension inferred from the malacological succession of La Celle allows the shorter successions from northern France and south-eastern England to be located within the maximum development of the humid forest biotope during MIS 11c. The order of occurrence of forest snails indicates that Atlantic and Central European refugia are the original sources of recolonizations for north-western European sites. Strict Mediterranean species reach the area only at the MIS 11c climatic optimum. Many species present during MIS 11c no longer live in this part of Europe, indicating a northward shift in the location of the modern alpine biodiversity hotspot.

中文翻译：

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基于 La Celle（法国塞纳河谷）的malacological 演替的西北欧 MIS 11 间冰期的古环境动力学：与冰川避难所和古生物多样性的关系

摘要 在西北欧，更新世间冰期的大陆记录保存在河流序列中，特别是在该系列顶部形成的钙质凝灰岩中。它们是唯一记录完全最佳状态的矿床。Tufas 包含丰富的 Malacological 群落，可以重建过去间冰期的详细古环境历史。在研究区域对几种凝灰岩进行了调查，这导致人们认识到“Lyrodiscus 动物群”是西北欧 MIS 11 年龄的凝灰岩序列的特征生物地层特征。其中，位于塞纳河谷（法国）的 La Celle 是唯一一处凝灰岩积累了相当大的厚度（近 9 m），其中体现了 Lyrodiscus 动物群的完整发展，产生了 MIS 11 间冰期森林扩张的详细记录。因此，La Celle 序列提供了一个区域框架，可以在其中设置其他序列，揭示古环境动力学、生物地层学、古地理和古生物多样性的各个方面。La Celle 的联合苹果糖学和同位素记录表明温度升高与林地蜗牛群落的发展之间存在密切相关性。从 La Celle 的malacological 演替推断的森林扩展的古生态框架允许来自法国北部和英格兰东南部的较短的演替位于 MIS 11c 期间潮湿森林生物群落的最大发展范围内。森林蜗牛的出现顺序表明大西洋和中欧的避难所是西北欧遗址重新殖民的原始来源。严格的地中海物种仅在 MIS 11c 气候最佳时到达该地区。MIS 11c 期间出现的许多物种不再生活在欧洲的这一部分，这表明现代高山生物多样性热点的位置向北移动。