1. Department of Biology Western University 1151 Richmond Street London ON N6A 3K7 Canada
2. Long Point Waterfowl and Wetlands Research Program, Birds Canada PO Box 160 (Courier: 115 Front Road) Port Rowan ON N0E 1M0 Canada
3. Delta Waterfowl Foundation 1412 Basin Avenue Bismarck ND 58504 USA
4. University of Nebraska, School of Natural Resources 3310 Holdrege Street Lincoln NE 68583 USA