Edward Gregorich, Agriculture and Agri-Food Canada, Ottawa, ON, Canada, Ashley Sparrow, CSIRO, Alice Springs, Australia, David Hopkins, Heriot-Watt University, Edinburgh, Scotland, Bo Elberling, University of Copenhagen, DK-1350, COPENHAGEN, DENMARK, Phil Novis, Landcare Research, Christchurch, New Zealand and Laurence Greenfield, Schoool of Biology, University Of Canterbury, Christchurch, New Zealand