1. School of Life and Environmental Sciences, Faculty of Science, Charles Perkins Centre, University of Sydney, Sydney, Australia
2. Department of Forest and Resource Management, Toi Ohomai Institute of Technology, Rotorua, New Zealand
3. Waste Management NZ Ltd, Auckland, New Zealand
4. Landcare Research, Christchurch, New Zealand
5. Institute of Natural and Mathematical Sciences, Massey University, Auckland, New Zealand