[1] Inst Environm Sci & Res Ltd, Christchurch, New Zealand
[2] Natl Inst Water & Atmospher Res Ltd, Christchurch, New Zealand
[3] SRUC, Land Econ Environm & Soc, Edinburgh, Midlothian, Scotland
[4] Univ Otago, Dept Management, Dunedin, New Zealand
[5] Manaaki Whenua Landcare Res Ltd, Lincoln, New Zealand
[6] Natl Inst Water & Atmospher Res Ltd, Hamilton, New Zealand