1. United Nations Environment Programme World Conservation Monitoring Centre; 219 Huntingdon Road Cambridge CB3 0DL UK
2. Centre for Biodiversity and Environment Research, Dept of Genetics, Evolution and Environment; Univ. College London; Gower Street London WC1E 6BT UK
3. Dept of Life Sciences, Natural History Museum; Cromwell Road London SW7 5BD UK
4. School of Life Sciences, Univ. of Sussex; Brighton BN1 9QG UK
5. Dept of Biosciences, College of Science; Swansea Univ.; Singleton Park Swansea SA2 8PP UK
6. Dept of Life Sciences, Imperial College London; Silwood Park London SL5 7PY UK
7. Dept of Ecology and Natural Resource Management; Norwegian Univ. of Life Sciences; PO Box 5003 NO-1432 Ås Norway