DOUBLE SAMPLING TO ESTIMATE DENSITY AND POPULATION TRENDS IN BIRDS

By J. Bart, S. Earnst. 2002

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Density estimation in wildlife surveys (2004, background): “Reducing bias due to closure, surplus birds, and detection rates Double-sampling (Cochran 1977, Anderson 2001, Bart and Earnst 2002) provides a general approach for reducing sources of bias other than incomplete coverage.”
Inferences About Landbird Abundance from Count Data: Recent Advances and Future Directions (2009, methodology): “The general term “double sampling” from general sample survey statistics (e.g., Cochran 1977; Thompson 2002a) has recently been used to refer to a specific approach to estimation of avian density from count data (Bart and Earnst 2002).”
When can we ignore the problem of imperfect detection in comparative studies? (2012, methodology): “This approach relies on estimating the mean detectability and its standard deviation by replicating counts over a representative part of the study plots only (Bart & Earnst 2002; Pollock et al. 2002) and has been successfully used with patch occupancy models (Kéry et al. 2010b).”
EXPERIMENTAL ANALYSIS OF THE AUDITORY DETECTION PROCESS ON AVIAN POINT COUNTS (2007, methodology): “…sampling (Buckland et al. 2001), multipleobserver methods (Nichols et al. 2000, Alldredge et al. in press a), time-ofdetection methods (Farnsworth et al. 2002, Alldredge et al. in press b), double sampling (Bart and Earnst 2002) and repeated count methods (Royle and Nichols 2003, Kery et al. 2005).”