Affiliation: | 1. Laboratory of Plant Ecology, P.O. Box 14, NL-9750 AA, Haren, The Netherlands 2. Directorate of Policy and Science, Countryside Council for Wales, Plas Penrhos, Ffordd Penrhos, LL57 2LQ, Gwynedd, Wales, UK 3. Landscape and Environmental Research Group, University of Amsterdam, Nieuwe Prinsengracht 130, NL-1018, VZ Amsterdam, The Netherlands 4. University of Lyon 2, P.O. Box 11, 69676, Bron Cedex, France
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