The Lodge Sandy Bedfordshire SG19 2DL UK;
Department of Plant and Soil Science Aberdeen University Cruickshank Building Machar Drive Aberdeen AB24 3UU UK;
Department of Plant and Soil Science Aberdeen University Cruickshank Building Machar Drive Aberdeen AB24 3UU UK;
Centrefor Ecology and Hydrology Monks Wood Abbots Ripton Huntingdon Cambridgeshire PE17 2LS UK;
RSPB The Lodge Sandy Bedfordshire SG19 2DL UK;