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  • 1.
    Kuosmanen, Niina
    et al.
    Czech Univ Life Sci Prague, Czech Republic;Univ Helsinki, Finland.
    Marquer, Laurent
    Lund University;Univ Toulouse Jean Jaures, France.
    Tallavaara, Miikka
    Univ Helsinki, Finland.
    Molinari, Chiara
    Lund University.
    Zhang, Yurui
    Univ Helsinki, Finland;Vrije Univ Amsterdam, Netherlands.
    Alenius, Teija
    Univ Helsinki, Finland.
    Edinborough, Kevan
    UCL, UK.
    Pesonen, Petro
    Natl Board Antiqu, Finland.
    Reitalu, Triin
    Tallinn Univ Technol, Estonia.
    Renssen, Hans
    Vrije Univ Amsterdam, Netherlands;Univ Coll Southeast Norway, Norway.
    Trondman, Anna-Kari
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Seppa, Heikki
    Univ Helsinki, Finland.
    The role of climate, forest fires and human population size in Holocene vegetation dynamics in Fennoscandia2018In: Journal of Vegetation Science, ISSN 1100-9233, E-ISSN 1654-1103, Vol. 29, no 3, p. 382-392Article in journal (Refereed)
    Abstract [en]

    QuestionsWe investigated the changing role of climate, forest fires and human population size in the broad-scale compositional changes in Holocene vegetation dynamics before and after the onset of farming in Sweden (at 6,000cal yr BP) and in Finland (at 4,000calyr BP). LocationSouthern and central Sweden, SW and SE Finland. MethodsHolocene regional plant abundances were reconstructed using the REVEALS model on selected fossil pollen records from lakes. The relative importance of climate, fires and human population size on changes in vegetation composition was assessed using variation partitioning. Past climate variable was derived from the LOVECLIM climate model. Fire variable was reconstructed from sedimentary charcoal records. Estimated trend in human population size was based on the temporal distribution of archaeological radiocarbon dates. ResultsClimate explains the highest proportion of variation in vegetation composition during the whole study period in Sweden (10,000-4,000cal yr BP) and in Finland (10,000-1,000cal yr BP), and during the pre-agricultural period. In general, fires explain a relatively low proportion of variation. Human population size has significant effect on vegetation dynamics after the onset of farming and explains the highest variation in vegetation in S Sweden and SW Finland. ConclusionsMesolithic hunter-gatherer populations did not significantly affect vegetation composition in Fennoscandia, and climate was the main driver of changes at that time. Agricultural communities, however, had greater effect on vegetation dynamics, and the role of human population size became a more important factor during the late Holocene. Our results demonstrate that climate can be considered the main driver of long-term vegetation dynamics in Fennoscandia. However, in some regions the influence of human population size on Holocene vegetation changes exceeded that of climate and has a longevity dating to the early Neolithic.

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