1. Biological Sciences; University of Canterbury; Private Bag 4800; Christchurch; 8140; New Zealand
2. Biomathematics Research Centre; University of Canterbury; Private Bag 4800; Christchurch; 8140; New Zealand
3. Landcare Research; PO Box 40; Lincoln; 7640; New Zealand
4. 6 Cobb Place; Otaki; 5512; New Zealand
5. Department of Conservation; PO Box 55, St Arnaud; Nelson; 7053; New Zealand
6. Botany Department; University of Otago; Dunedin; 9054; New Zealand
7. 10527a Skyline Drive; Corning; New York; 14830; USA