Efficiency of adaptive cluster sampling for estimating density of wintering waterfowl

'Georgia Cooperative Fish and Wildlife Research Unit, School of Forest Resources, University of Georgia, Athens, Georgia 30602, U.S.A. 2National Biological Service, Georgia Cooperative Fish and Wildlife Research Unit, School of Forest Resources, University of Georgia, Athens, Georgia 30602, U.S.A. 3Waterfowl Management Section, Florida Game and Fresh Water Fish Commission, 8932 Apalachee Parkway, Tallahassee, Florida 32311, U.S.A.