Bird use of Delaware wetlands during fall migration based on weather radar observations Jeffrey J. Buler 1 , Tim D. Schreckengost 1 , Jaclyn Smolinsky 1 , James McLaren 1 , Deanna K. Dawson 2 , Eric L. Walters 3 1 Dept. of Entomology and Wildlife Ecology 2 Patuxent Wildlife Research Center 3 Dept. of Biological Sciences
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Bird use of Delaware wetlands during fall migration based on weather radar observations
Jeffrey J. Buler1, Tim D. Schreckengost1, Jaclyn Smolinsky1, James McLaren1, Deanna K. Dawson2, Eric L. Walters3
1 Dept. of Entomology and Wildlife Ecology
2 Patuxent Wildlife Research Center
3 Dept. of Biological Sciences
WSR-88D Weather Surveillance Radar – 1988 Doppler
(a.k.a. NEXRAD)
Initiation of nocturnal migration
Onset of migration
From Diehl and Larkin 2005
Reflectivity (Z or cm2/km3) (relative bird density)
Radial Velocity (m/s)
Sample volume Tilt = 0.5°
360° rotation
WSR-88D operation and data products
Temporal sampling rate 5 – 10 minutes
Volume scan
Low High
Bird layer
Range from radar (km)
2 – Height distribution of birds (Where are the birds?)