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Holocene forest development in the central Scandes Mountains, Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2005 (English)In: Vegetation History and Archaeobotany, ISSN 0939-6314, E-ISSN 1617-6278, Vol. 14, no 2, 133-147 p.Article in journal (Refereed) Published
Abstract [en]

Pollen analyses of sediment cores from two small lakes within the boreal forest in the central Scandes Mountains help to elucidate the Holocene forest dynamics of the region. Analyses of pore/pollen grain diameter ratios of Alnus grains indicate the early Holocene presence of Alnus glutinosa in the study area. The results are discussed in conjunction with available pollen records to evaluate the importance of thermophilous trees during the early Holocene and to deduce the regional spread of Picea abies. Corylus avellana, Alnus glutinosa and Ulmus glabra were probably common constituents of the early Holocene forest. Tilia cordata may have occurred there as a rare tree. Pollen stratigraphies from the region do not indicate the occurrence of Quercus robur. The regional spread of Picea abies can be separated into two phases: a mid-Holocene establishment or first expansion of small outpost populations and a late-Holocene population expansion. The mid-Holocene shift in vegetation composition may have been caused by changes in the westerly airflow.

Place, publisher, year, edition, pages
2005. Vol. 14, no 2, 133-147 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-92261DOI: 10.1007/s00334-005-0070-2OAI: oai:DiVA.org:uu-92261DiVA: diva2:165271
Available from: 2004-10-07 Created: 2004-10-07 Last updated: 2013-05-21Bibliographically approved
In thesis
1. The Holocene Spread of Spruce in Scandinavia
Open this publication in new window or tab >>The Holocene Spread of Spruce in Scandinavia
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Holocene spread of Picea abies in Scandinavia provides an excellent opportunity for detailed study of the dynamics of tree spread and population expansion. Early- and mid-Holocene macrofossil evidence for the presence of Picea abies in Scandinavia has questioned traditional interpretations of the timing and direction of its spread. This study aims to determine the pattern of the spread of Picea abies in Scandinavia from pollen and other data, to evaluate the significance of possible early outpost populations and to deduce possible factors that influenced the spread and population expansion of Picea abies in Scandinavia.

Palaeoecological investigations were carried out on the sediments of four small lakes in central Sweden to gain detailed insight into the dynamics of the spread. Holocene pollen diagrams with independent dating control were collected from Fennoscandia and adjacent areas to compare the timing of selected features of the Picea abies pollen curve. Computer models were used to test possible scenarios for the spread and Picea abies population expansion.

Picea abies entered the Scandinavian peninsula from the east at different times and by different pathways. Early-Holocene outposts can be discerned in pollen records from northwest Russia, eastern and northeastern Finland for the time before 9000 cal. BP. Pollen records from Sweden and Norway indicate small Picea abies populations after 8000 cal. BP. The mid to late-Holocene spread, which superficially resembles a front-like pattern, may in fact represent a wave of expanding populations. Disturbance through fire and human activity did not significantly influence the pattern of the spread. Changing climate parameters, slow adaptation and gene flow through seeds and pollen have to be considered as possible explanations for the late spread of the tree. Population dynamics and propagule pressure are likely to be important factors that shaped the spread of Picea abies.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 46 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1027
Quaternary geology, Picea abies, pollen analyses, tree migration, population dynamics, Kvartärgeologi
National Category
urn:nbn:se:uu:diva-4623 (URN)91-554-6064-X (ISBN)
Public defence
2004-10-29, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00
Available from: 2004-10-07 Created: 2004-10-07Bibliographically approved

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