1. Department of Geography; College of Science; Swansea University; Singleton Park Swansea SA2 8PP UK
2. School of Forest Resources and Environmental Science; Michigan Technological University; 1400 Townsend Drive Houghton MI 49931 USA
3. Departments of Earth Science, BioSciences, and Chemistry; MS 126, Rice University; 6100 Main St Houghton TX 77005 USA
4. Departments of Ecology and Natural Resource Management; Norwegian University of Life Sciences; PO Box 5003, NO-1432 Ås Norway
5. Institute of Natural Resources and Agrobiology of Seville (IRNAS); CSIC; Reina Mercedes Av. 10 41012 Seville Spain
6. Pacific Forestry Centre of Natural Resources Canada; 506 W. Burnside Rd. Victoria BC V8Z 1M5 Canada
7. Institute for Chemistry and Biology of the Marine Environment (ICBM); University of Oldenburg; Carl-von-Ossietzky-Str. 9-11 26129 Oldenburg Germany