1. British Trust for Ornithology Scotland, Stirling, FK9 4NF, UK
2. RSPB Scotland Headquarters, Edinburgh, EH12 9DH, UK
3. Marine Scotland Science, Aberdeen, AB11 9DB, UK
4. British Trust for Ornithology, Thetford, Norfolk, IP24 2PU, UK
5. Conservation Science Group, Department of Zoology, University of Cambridge, Cambridge, CB2 3EJ, UK
6. School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK