Affiliation: | 1. BTO, The Nunnery, Thetford, Norfolk IP24 2PU, UK;2. RSPB, The Lodge, Sandy, Bedfordshire SG19 2DL, UK;3. Dipartimento di Biologia Animale e dell’Uomo, Universita di Torino, Via Accademia Albertina 13, 10123 Turin, Italy;4. English Nature, Northminster House, Peterborough PE1 1UA, UK;5. Institute of Ecosystem Science, School of Biological Sciences, University of Durham, South Road, Durham DH1 3LE, UK |