title: Too early and too northerly: evidence of temperate trees in northern Central Europe during the Younger Dryas.
abstract: This paper presents highly unexpected paleobotanical data. Eight (14) C-accelerator mass spectrometry (AMS) dates of soil macrocharcoal pieces, identified taxonomically, indicate the presence of oak and beech in the Younger Dryas, and pine in the Allerød, in the northernmost low mountain range of Central Europe, the Harz Mountains, in Germany. If the presence of pine at such latitude and periods is not surprising, the presence of temperate-adapted trees is highly improbable, because they are assumed to have reached the area from a southern location several thousand years later. Two hypotheses are postulated to explain this record. Both are related to the warm periods of the Bølling and Allerød: the classically 'short' duration of this warm period makes the migration of the temperate trees from the identified refuge areas in the southern location implausible, and so the presence of intermediary microrefugia at a medium latitude in Central Europe is postulated; recent data reveal that the warm period of the Late Glacial phase was much longer than considered in the classical view and, thus, would be long enough for a northward migration of temperate-adapted trees. Although our dataset does not permit disentanglement of these hypotheses, it provides significant innovative insights for the biogeography of Central Europe.
authors: Interdisciplinary Laboratory for Continental Environments, University of Lorraine, Campus Bridoux, Bât. IBISE, 8 rue du Général Delestraint, 57070, Metz, France.
authors: Vincent
authors: V
authors: Robin
authors: Department of Archaeometry, Norwegian University of Science and Technology, 7491, Trondheim, Norway.
authors: Marie-Josée
authors: MJ
authors: Nadeau
authors: Institute for Ecosystem Research, University of Kiel, Olshausenstrasse 75, 24118, Kiel, Germany.
authors: Pieter M
authors: PM
authors: Grootes
authors: Institute for Ecosystem Research, University of Kiel, Olshausenstrasse 75, 24118, Kiel, Germany.
authors: Hans-Rudolf
authors: HR
authors: Bork
authors: Baden-Wuerttemberg State Office for Cultural Heritage - Tree-ring Lab, Fischersteig 9, 78343, Hemmenhofen, Germany.
authors: Oliver
authors: O
authors: Nelle
mesh_terms: D002980:Climate; D017753:Ecosystem; D005060:Europe; D019015:Geologic Sediments / Q000737:chemistry; D058974:Phylogeography; D012987:Soil / Q000737:chemistry; D013997:Time Factors; D014197:Trees / Q000033:anatomy & histology / Q000502:physiology*
chemical_list: D012987:Soil
keywords: Europe; early spread; late/postglacial migration; refugia; temperate trees