1. Department of Fisheries and Wildlife and Department of Forestry, Michigan State University, East Lansing, MI, USA.
2. Department of Biology, Bryn Mawr College, Bryn Mawr, PA, USA.
3. Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA.
4. Bosque Ecosystem Monitoring Program, University of New Mexico, Albuquerque, NM, USA.
5. Department of Biometry and Environmental Systems Analysis, University of Freiburg, Freiburg im Breisgau, Germany.
6. Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada.
7. UN Environment Programme World Conservation Monitoring Centre, Cambridge, UK.
8. Department of Biology, University of New Mexico, Albuquerque, NM, USA.
9. Department of Geography, State University of New York, Buffalo, NY, USA.
10. National Great Rivers Research and Education Center, East Alton, IL, USA.
11. Department of Biology, Washington University, St. Louis, MO, USA.
12. Department of Mathematics and Statistics, University of New Mexico, Albuquerque, NM, USA.