1. Division of Environmental and Evolutionary Biology, University of Glasgow, Glasgow G12 8QQ, UK
2. Institut für Botanik, Universität Innsbruck, Sternwartestrasse 15, A-4020 Innsbruck, Austria
3. Headland Archaeology Ltd, 78 Albion Road, Edinburgh EH7 5QZ, UK
4. Scottish Crop Research Institute, Invergowrie DD2 5DQ, UK
5. Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford OX1 3QJ, UK
6. Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, Glasgow G75 0QF, UK