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Estimating wintering Bald Eagle densities in the Mississippi Alluvial Valley

December 31, 1991

Surveys on the winter distribution of Bald Eagles have been concentrated in the northern USA (Hastings 1988, Mattson 1988), where Bald Eagles are most common. Few density estimates for wintering Bald Eagles exist. In the past, different survey techniques with little standardization have been used. Statistical analyses and error measurements of existing winter survey data usually are not possible. The National Wildlife Federation's "midwinter Bald Eagle survey," the largest operational winter survey, is
not systematic. Observers concentrate on areas where large numbers of Bald Eagles winter. We collected Bald Eagle density and distribution data in the Mississippi alluvial valley (MAV) while conducting four regional aerial surveys for Mallards (Anas platyrhynchos) during the winters of 1988-89 and 1989-90. Our objectives were to determine if the relatively large sample size and experimental design used in our Mallard surveys would provide accurate population estimates and additional distribution data not provided by current Bald Eagle surveys

Publication Year 1991
Title Estimating wintering Bald Eagle densities in the Mississippi Alluvial Valley
Authors Mike Brown, J.R. Nassar
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Raptor Research
Index ID 70204269
Record Source USGS Publications Warehouse
USGS Organization National Wetlands Research Center; Wetland and Aquatic Research Center