1. School of Natural Resources and the Environment, 325 Biological Sciences EastUniversity of ArizonaTucsonArizona85721USA
2. Department of ZoologyOregon State UniversityCordley Hall 3029CorvallisOregon97331USA
3. New Mexico Fish and Wildlife Conservation Office3800 Commons Avenue NEAlbuquerqueNew Mexico87109USA
4. U.S. Geological Survey, Arizona Cooperative Fish and Wildlife Research Unit, 104 Biological Sciences EastUniversity of ArizonaTucsonArizona85721USA