A Field Evaluation of Distance Measurement Error in Auditory Avian Point Count Surveys

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Estimating Population Density of Amazonian Titi Monkeys (Callicebus discolor) via Playback Point Counts (2011, background): “Furthermore, observer–animal distances were rounded during surveys due to the intrinsic uncertainties associated with estimating distances based on auditory detection (Alldredge et al. 2007, Simons et al. 2009).”
Estimating bird abundance: making methods work (2008, methodology): “In dense woodland, accurate distance estimation can be a severe limitation ( Alldredge et al. 2007b ).”
Effects of Vegetation and Background Noise on the Detection Process in Auditory Avian Point-Count Surveys (2008, methodology): “Previous experiments have evaluated the effects of singing rate, number of species, and observer variability (Alldredge et al. 2007b) and assessed current sampling methods, including distance estimation (Alldredge et al. 2007a), multipleobserver methods (Alldredge et al. 2008), and…”
In Defense of Indices: The Case of Bird Surveys (2008, methodology): “In addition, Alldredge et al. (2007a) incorporated covariates, such as distance, in the models.”