We acknowledge with thanks many people who assisted with the preparation of this review. First and foremost Chris Livesey, Ministry for the Environment, who initiated the project and provided helpful and cheerful advice throughout. We also received helpful logistical assistance from Lisa Johnston, Sarah Davies and Mike Barton (Information Centre) from the Ministry for the Environment. Finally we would like to thank the following for very useful advice, information and review comments: Peter Stephens, Stephen Swabey and Trecia Smith (Ministry for the Environment), Avinash Shrivastava and Peter Lough (Ministry of Agriculture and Forestry), Joseph Arand (Department of Conservation), John Dymond, Richard Gibb and Kevin Tate (Landcare Research), Mike Page and Noel Trustrum (GNS Science), Peter Clough (NZIER), Bruce Peploe (Environment Waikato), Bob Cathcart and Nigel Mark-Brown (Northland Regional Council) and Andrew Burton (Tasman District Council).