1. Dept of Environmental Sciences, Policy and Management; Univ. of California; Berkeley CA 94720 USA
2. Center for Integrated Spatial Research, Environmental Studies Dept; Univ. of California; Santa Cruz, Santa Cruz CA USA
3. Washington Dept of Fish and Wildlife; Olympia WA USA
4. Dept of Fisheries and Wildlife; Oregon State Univ.; Corvallis OR USA
5. San Francisco Bay Bird Observatory; Milpitas CA USA