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The Holocene spread of Picea abies (L.) Karst. in Fennoscandia and adjacent areas
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
2004 In: Journal of Biogeography, ISSN 0305-0270, Vol. 31, 1523-1548 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2004. Vol. 31, 1523-1548 p.
Identifiers
URN: urn:nbn:se:uu:diva-92262OAI: oai:DiVA.org:uu-92262DiVA: diva2:165272
Available from: 2004-10-07 Created: 2004-10-07Bibliographically 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.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1027
Keyword
Quaternary geology, Picea abies, pollen analyses, tree migration, population dynamics, Kvartärgeologi
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-4623 (URN)91-554-6064-X (ISBN)
Public defence
2004-10-29, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00
Opponent
Supervisors
Available from: 2004-10-07 Created: 2004-10-07Bibliographically approved

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