Occurrence of mammalia relicts at site Nörre-Lyngby

Investigations at a Late Weichselian freshwater basin in northwestern Jutland, Denmark, yielded a fairly rich assemblage of vertebrate remains, mostly bones and teeth of small mammals. The remains are primarily allochthonous and the bones have been subjected to different taphonomic pathways and agents. AMS 14C-dates on terrestrial organic remains provided ages of Middle to Late Allerød time. Identifications revealed the first fossil record in Scandinavia of Rana arvalis, Sorex minutus, Ochotona cf. pusilla, Microtus gregalis, Microtus oeconomus, and Sicista cf. betulinu. Spermophilus cf. major and Desmana moschata, previously found only once and twice respectively, were retrieved, and Sorex araneus and Arvicola terrestris were recovered for the first time beyond the Atlantic chronozone. Ecologically, the Nørre Lyngby small mammal fauna can be characterized by its very high and almost equal proportions of boreal forest and steppe elements followed by a relatively high proportion of tundra elements. The fossil species share a modern area of sympatry north of the Caspian Sea from the river Volga in the west to the southern and western slopes of the Urals. If, however, the large Allerød mammals are added, the fauna is without modern analogues. The Nørre Lyngby fauna can be seen as a last expansion of the North European glacial fauna. Provided that an absolute chronology and a differentiated sea-level curve for the area can be established, the Nørre Lyngby fauna could become important for studies in mammalian dispersal and migration rates.

对丹麦日德兰半岛西北部一处晚玉木冰期（Late Weichselian）淡水盆地的调查，获得了种类较为丰富的脊椎动物遗体组合，主体为小型哺乳动物的骨骼与牙齿。该批遗体多为异地埋藏（allochthonous），骨骼经历了不同的埋藏学路径与作用营力。对陆生有机质遗体开展的加速器质谱碳14测年（AMS 14C-dates）结果表明，其年代归属阿勒罗德冰阶（Allerød）中晚期。物种鉴定显示，本次调查为北欧（Scandinavia）地区首次记录到沼泽蛙（Rana arvalis）、小鼩鼱（Sorex minutus）、相似鼠兔（Ochotona cf. pusilla）、狭颅田鼠（Microtus gregalis）、根田鼠（Microtus oeconomus）以及相似桦树蹶鼠（Sicista cf. betulinu）。此前仅分别被报道过1次和2次的大型相似黄鼠（Spermophilus cf. major）与麝鼹（Desmana moschata）也被本次采集到；欧洲鼩鼱（Sorex araneus）和欧洲水䶄（Arvicola terrestris）则是首次在大西洋气候带（Atlantic chronozone）以外被发现。从生态学特征来看，诺尔林比（Nørre Lyngby）小型哺乳动物群以占比极高且近乎均等的寒温带针叶林（boreal forest）与草原（steppe）类群为主要特征，其次苔原（tundra）类群占比也相对较高。该化石组合的现生近缘类群的同域分布（sympatry）区域北至里海（Caspian Sea），西抵伏尔加河（Volga），南至乌拉尔山脉（Urals）中西段山坡。但若将大型阿勒罗德冰期哺乳动物纳入该动物群范畴，则其无现生对应类群。诺尔林比动物群可被视作北欧冰川动物群的最后一次扩张。若能为该区域建立绝对年代学框架与高精度海平面变化曲线，诺尔林比动物群将有望成为研究哺乳动物扩散与迁移速率的重要研究材料。