Affiliation: | 1. School of Natural and Rural Systems Management, University of Queensland , Gatton Campus, Queensland, Australia , 4343 E-mail: .hockings@uq.e;2. Hardscrabble Associates , 1061 MountainviewRoad, Waterbury, Vermont, 05676, USA E-mail: ervin@sover.ne;3. Parks Victoria , 535 Burke St., Melbourne, Victoria, Australia , 3000 E-mail: vincent@parks. |