1. Centre for Resource and Environmental Studies, The Australian National University, Canberra, ACT 0200, Australia
2. Department of Geography, The Australian National University, Canberra, ACT 0200, Australia
3. Department of Land and Water Conservation, 10 Valentine Avenue, Parramatta, NSW 2150, Australia
4. Centre for Conservation Biology, The University of Queensland, St. Lucia, Queensland, 4072, Australia
5. Department of Land and Water Conservation, Armidale, NSW 3251, Australia
6. School of Botany, The University of Melbourne, Parkville, Victoria, 3010, Australia