1. School of Biological Sciences; Victoria University of Wellington; PO Box 600 Wellington New Zealand
2. Botany Department; University of Otago; P. O. Box 56 Dunedin 9054 New Zealand
3. Department of Biology; High Point University; University Station 3591 High Point NC 27262 USA
4. Department of Chemistry; The New Zealand Institute for Plant & Food Research Limited; University of Otago; PO Box 56 Dunedin New Zealand
5. Department of Animal Ecology and Evolutionary Biology; Faculty of Biology; University of Freiburg; Hauptstrasse 1 D-79104 Freiburg Germany