A comparison of nocturnal call counts of migrating birds and reflectivity measurements on Doppler radar

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FLIGHT CALLS AND THEIR VALUE FOR FUTURE ORNITHOLOGICAL STUDIES AND CONSERVATION RESEARCH (2005, background): “…et al. 2002, Farnsworth et al. 2004), though extensive variation in calling rates (within and among species) poses a major challenge for measuring bird density from fl ight calls alone (Libby 1899, Graber 1968, Dierschke 1989, Evans and Mellinger 1999, Farnsworth 2001, Farnsworth et al. 2004).”
Detecting bird sounds in a complex acoustic environment and application to bioacoustic monitoring (2010, methodology): “Acoustic pattern recognition algorithms have been successfully applied to the study of nocturnal migrations of birds (Evan and Mellinger, 1999; Farnsworth et al., 2004; Farnsworth, 2005; Farnsworth 0167-8655/$ -see front matter Ó 2009 Elsevier B.V.”
Remote techniques for counting and estimating the number of bird–wind turbine collisions at sea: a review (2006, background): “The relative volume (detection rate) at the species level can be obtained (Farnsworth et al. 2004), but such data will always be biased towards species using contact calls during nocturnal migration and towards birds migrating at lower altitudes.”