1. Department of Fishery and Wildlife SciencesNew Mexico State UniversityBox 30003, MSC 4901Las CrucesNew Mexico88003USA
2. U.S. Geological Survey, New Mexico Cooperative Fish and Wildlife Research Unit, New Mexico State UniversityBox 30003, MSC 4901Las CrucesNew Mexico88003USA
3. University Statistics Center, New Mexico State University, MSC 3QCLas CrucesNew Mexico88003USA