Using Theoretical Flight Speeds to Discriminate Birds from Insects in Radar Studies

摘要: Abstract. Marine radar is a tool widely used in the study of bird migration, but most cases it cannot identify detected objects to species. For this reason airspeed as one main criteria separate birdlike from insectlike targets, criterion has not been tested outside temperate regions where was developed. We theoretical approach for calculating minimum-power speeds (Vmp) and maximum-range (Vmr) birds insects estimate an interval airspeeds which appropriate value can be selected propose based on flight speed Isthmus Tehuantepec southern Mexico. This approach, with data 36 species 60 passerines either known occur or similar occurring Mexico, found that although Vmp overlaps at 5.5 m sec-1, generally fly faster than insects. After combining our results literature, we conclude best airspe...