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Holocene Isochrone Maps and Patterns of Tree-Spreading in the British Isles

H. J. B. Birks
Journal of Biogeography
Vol. 16, No. 6 (Nov., 1989), pp. 503-540
Published by: Wiley
DOI: 10.2307/2845208
Stable URL: http://www.jstor.org/stable/2845208
Page Count: 38
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Holocene Isochrone Maps and Patterns of Tree-Spreading in the British Isles
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Abstract

Isochrone maps for Betula L., Corylus avellana L., Ulmus L., Quercus L., Pinus sylvestris L., Alnus glutinosa (L.) Gaertn., Tilia L., Fraxinus excelsior L. and Fagus sylvatica L. in the Holocene of the British Isles, constructed from 135 radiocarbon-dated pollen diagrams, provide a basis for studying the patterns of tree spread. They highlight the strongly individualistic behaviour of each taxon in its arrival areas, directions, timings, rates of spread, and attainment of broad-scale range limits. The biological processes that enable forest trees to spread at rates of 500 m yr-1 or more have implications for palaeoecological and palaeoclimatic reconstructions. Numerical results from models of Holocene biological invasions provide a background against which rates of recent invasion can be assessed.

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