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Science 25 August 2000:
Vol. 289. no. 5483, pp. 1343 - 1346
DOI: 10.1126/science.289.5483.1343
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Reports
Molecular Analysis of Plant Migration and Refugia in the Arctic
Richard J. Abbott,1*
Lisa C. Smith,1
Richard I. Milne,1
Robert M. M. Crawford,1
Kirsten Wolff,12
Jean Balfour1
The arctic flora is thought to have originated during the late
Tertiary, approximately 3 million years ago. Plant migration routes
during colonization of the Arctic are currently unknown, and
uncertainty remains over where arctic plants survived Pleistocene glaciations. A phylogenetic analysis of chloroplast DNA variation in
the purple saxifrage (Saxifraga oppositifolia) indicates
that this plant first occurred in the Arctic in western Beringia before it migrated east and west to achieve a circumpolar distribution. The
geographical distribution of chloroplast DNA variation in the species
supports the hypothesis that, during Pleistocene glaciations, some
plant refugia were located in the Arctic as well as at more southern
latitudes.
1 Division of Environmental and Evolutionary
Biology, Harold Mitchell Building, School of Biology, University of St.
Andrews, St. Andrews, Fife KY16 9TH, UK.
2 Department of Agricultural and Environmental
Sciences, Ridley Building, University of Newcastle, Newcastle-upon-Tyne
NE1 7RU, UK.
*
To whom correspondence should be addressed. E-mail:
rja{at}st-and.ac.uk
Read the Full Text
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