1. International Forestry Resources and Institutions Research Network, School of Natural Resources and Environment; The University of Michigan; Ann Arbor MI 48109 U.S.A.
2. School of Biology; Newcastle University; Newcastle-upon-Tyne NE1 7RU United Kingdom
3. School of Earth and Environment; University of Leeds; Leeds LS2 9JT United Kingdom
4. School of Science and Environment; Manchester Metropolitan University; Manchester M1 5GD United Kingdom
5. Department of Animal and Plant Sciences; The University of Sheffield; Sheffield S3 7HF United Kingdom