1. School of Biological Sciences University of Canterbury Christchurch 8140 New Zealand
2. las Zonas Áridas CONICET CC 507 5500 Mendoza Argentina
3. Department of Forest Ecology and Management Swedish University of Agricultural Sciences Skogsmarksgränd Umeå Sweden
4. School of Animal Biology The University of Western Australia Crawley Western Australia 6009 Australia
5. CSIRO Land & Water, Centre for Environment and Life Sciences Floreat Western Australia 6014 Australia
6. USDA‐ARS Northern Plains Agricultural Research Laboratory Sidney Montana 59270 USA
7. Department of Life Sciences Imperial College London Silwood Park Campus Ascot Berkshire SL5 7PY UK