1. Point Blue Conservation Science, 3820 Cypress Drive, Suite 11, Petaluma, CA 94954, USA
2. Manaaki Whenua Landcare Research, PO Box 69040, Lincoln 7640, New Zealand
3. US Geological Survey, Oregon Cooperative Fish and Wildlife Research Unit, Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR 97331, USA
4. Oregon Cooperative Fish and Wildlife Research Unit, Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR 97331, USA
5. National Institute for Water and Atmosphere, PO Box 8602, Christchurch 8440, New Zealand
6. Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand