A Comparison between Nocturnal Aural Counts of Passerines and Radar Reflectivity from a Canadian Weather Surveillance Radar

@inproceedings{Gagnon2010ACB,
  title={A Comparison between Nocturnal Aural Counts of Passerines and Radar Reflectivity from a Canadian Weather Surveillance Radar},
  author={François Gagnon and Marc B{\'e}lisle and Jacques Ibarzabal and Pierre Vaillancourt and Jean-Pierre L. Savard},
  year={2010}
}
ABSTRACT. Using a Canadian weather surveillance radar (CWSR), we assessed the relationship between aural passerine counts and radar reflectivity during autumn migration on 16 nights. Reflectivity was positively correlated on all but 1 night with the number of birds detected aurally, but the correlation strength varied between -0.58 and 0.93 among nights (mean ± SD = 0.69 ± 0.42). Using linear mixed-effects models with aural counts nested within nights, we found that the number of birds… 

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References

SHOWING 1-10 OF 32 REFERENCES

Nocturnal Migration in Illinois: Different Points of View

S INCE 1957, with other colleagues of the Illinois Natural History Survey, I have attempted by various means to observe and describe night migration of birds in central Illinois. Our accumulation of

A Radar Study of the Altitude of Nocturnal Passerine Migration

On long-range radar, the diffuse, grainy echo pattern produced by passerinc nocturnal migrants frequently causes saturation of the radar scopes (PPI, RHI) up to 25 nautical miles. The development of

Evolution of the Canadian Operational Radar Network

The Meteorological Service of Canada began to revitalize its weather radar network in April 1997 with work scheduled to be completed in 2004. The three main components of this work include: the

Using a Network of WSR-88D Weather Surveillance Radars to Define Patterns of Bird Migration at Large Spatial Scales

Only one study has examined nocturnal bird migration at a continent-wide scale in North America, and it was limited to four nights in October (Lowery and Newman 1966). Most radar studies of bird

Atmospheric Structure and Avian Migration

Why do some birds migrate during daytime and others at night? Why do some fly at high altitudes and others at lower altitudes? Whereas no comprehensive explanation of the diel schedule and altitude

Displays of Bird Movements on the WSR-88D: Patterns and Quantification*

Abstract The WSR-88D can readily detect birds in the atmosphere in both clear air and precipitation mode, and echo reflectivities of 30–35 dBZ may be realized during heavy migration events or when

Effect of Nonuniform Beam Filling on the Propagation of the Radar Signal at X-Band Frequencies. Part I: Changes in the k(Z) Relationship

Abstract Most attenuation correction algorithms are based on the assumption of an average, range-independent power-law relationship, k = aZb, between attenuation k and reflectivity Z. This paper

Comments on ''Display of Bird Movements on the WSR-88D: Patterns and Quantification''

It is our belief that weather radars are a powerful tool for monitoring the migration of birds in North America. We therefore read with interest the article by Gauthreaux and Belser (1998) dealing

Conditional Akaike information for mixed-effects models

This paper focuses on the Akaike information criterion, AIC, for linear mixed-effects models in the analysis of clustered data. We make the distinction between questions regarding the population and