Abstract
We describe a new palaeobotanical site at Bubano quarry on the easternmost Po plain, northern Italy. Pollen and macrofossils from river and marsh sediments demonstrate the occurrence of Picea in a Pinus sylvestris forest growing in a radius of some tens of kilometres south of the sedimentation place, at the beginning of the Late-glacial interstadial. The Late-glacial and Holocene history of Picea in the northern Apennines is reconstructed on the basis of the palaeobotanical record. The sharp climatic continentality increase eastwards across the northern Apennines from the Tyrrhenian to the Adriatic coast is considered significant for the survival of Picea during the Late-glacial. The most critical phase of survival is related to the moisture changes and consequent Abies competition associated with the last glacial-interglacial transition and the early Holocene. The residual spruce populations expanded during the middle Holocene. The history of Picea in the northern Apennines is a case of ineffective interglacial spread of tree populations from pre-existing stands of LGM (Last Glacial Maximum) and Late-glacial age.
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Acknowledgements
We are pleased to dedicate this paper to Brigitta Ammann, who first highlighted situations of delayed conifer expansion in the Balkans, recalling the problems discussed in the present paper. The results of this study have been achieved thanks to her steady support, and within the project SNSF 3100AO-101218 “Long term population dynamics of major forest trees under strongly and weakly changing climates”, which is currently in progress under her coordination. This is also a contribution to the Palaeoclimatology Research Line of the C.N.R. – Istituto per la Dinamica dei Processi Ambientali, Section of Milano.
The core BRUest-B was obtained with the help of the IPS, University of Bern, thanks to the power of W. Tanner and the helpfulness of W. Tinner and D. Colombaroli. We thank the Museo Tridentino di Scienze Naturali for the permission to use the pollen record from the Lavarone lake, a part of the OLOAMBIENT project coordinated by this Museum and funded by Provincia Autonoma di Trento, Servizio Università e Ricerca Scientifica. We are indebted to Federica Quaglia and Laura Lattuada, who skilfully prepared the thin section of fossil needles under the direction of G. Vailati (Department of Biology of the University of Milan). The advice of Pim van der Knaap (University of Bern), as well as the accurate revision by T. Giesecke (University of Uppsala) and an anonymous reviewer, were greatly appreciated.
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Ravazzi, C., Donegana, M., Vescovi, E. et al. A new Late-glacial site with Picea abies in the northern Apennine foothills: an exception to the model of glacial refugia of trees. Veget Hist Archaeobot 15, 357–371 (2006). https://doi.org/10.1007/s00334-006-0055-9
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DOI: https://doi.org/10.1007/s00334-006-0055-9