Paleoenvironments of the Last Interglacial–Glacial Transition on the East European Plain: Insights into Climate-Driven Ecosystem Dynamicsстатья
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Аннотация:A multiproxy study of a new Pleistocene locality at Ivantzevo, Moscow Region, wasconducted to reconstruct paleoenvironments from the Middle Pleistocene to the LastPleniglacial. Lacustrine deposits and peat accumulated in a wetland within a fluvioglacialdepression formed during the Dnieper–Moscow glaciation. Silts and clays were depositedduring MIS 7 and the Moscow (Saale) Glaciation (MIS 6), while peat accumulation began inthe Mikulino (Eemian) (MIS 5e). The wetland persisted for approximately fifty millennia,until the Middle Valdai (Weichselian). Interglacial peat deposits contain well-preservedpollen and macrofossils, and the recovered fossil insect assemblage is unique for EuropeanRussia. Chronology was established using multiple OSL and 230Th/U dates, combined withpollen-based correlations to type sections north and west of the region. The reconstructedecosystem dynamics are divided into eleven stages. The transition from the last interglacialto the second stadial of the Valdai involved seven phases: (1) expansion of boreal spruceforest, (2) spread of thermophilic broad-leaved forests with hazel, (3) development of openforest–steppe ecosystems with groves of deciduous trees, (4) re-establishment of forestcover with birch and, later, mixed pine, spruce, and birch forests, (5) emergence of coldsteppe combined with shrub-dominated tundra, (6) return of boreal spruce forest, and(7) abrupt replacement of forest by cold steppe and shrub tundra. Climatic reconstructionsindicate that these ecosystem dynamics closely corresponded to changes in precipitationand aridity.