Effects of Mesolithic hunter-gatherers on local vegetation in a non-uniform glacio-isostatic land uplift area, northern Sweden |
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Authors: | Greger Hörnberg Elisabeth Bohlin Erik Hellberg Ingela Bergman Olle Zackrisson Anders Olofsson Jan-Erik Wallin Tore Påsse |
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Institution: | 1. Department of Forest Vegetation Ecology, Swedish University of Agricultural Sciences, SE-901 83, Ume?, Sweden 2. The Silvermuseum of Arjeplog, Storgatan 20, SE-930 90, Arjeplog, Sweden 3. Department of Archaeology and Sami Studies, Ume? University, SE-901 87, Ume?, Sweden 4. Department of Ecology and Environmental Science, Ume? University, SE-901 87, Ume?, Sweden 5. Geological Survey of Sweden, Earth Sciences Centre, SE-413 20, Gothenburg, Sweden
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Abstract: | The oldest early Mesolithic settlements found so far (i.e. 8600 b.p.) in the interior of northern Sweden, in the province of Norrbotten, have been discovered through the application of a model simulating glacio-isostatic land uplift. The objective of this study was to investigate, through pollen and charred particle analyses, vegetation composition and the influence of man on vegetation and fire pattern in the vicinity of two of these early settlements. Early Holocene vegetation was characterised by Betula, Hippophaë and Salix-species, but no initial impact by hunter-gatherers on vegetation was detected. Subsequently Betula and Pinus became dominant but abrupt changes in the tree layer followed, Poaceae, Hippophaë and Salix-species increased, and Humulus occurred. These changes, which were synchronous with dates of archaeological findings at the settlements, indicated local vegetation changes caused by man. The relationship between these changes and fire was, however, subtle. Eventually Pinus forests became dominant and human impact on vegetation became less apparent. It is concluded that the impact of early Mesolithic hunter-gatherers on vegetation was detectable, but that their effect on fire pattern was difficult to evaluate. Further, we show that the glacio-isostatic land uplift must be considered in the search for Mesolithic settlements in areas previously covered by the Weichselian Ice, and that the process has influenced the biological archives through re-deposition of material. |
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Keywords: | Early Holocene Fire pattern Human impact Pollen |
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