Facultative Altitudinal Movements by Mountain White-Crowned Sparrows ( Zonotrichia leucophrys oriantha ) in the Sierra Nevada Author ( s ) :

@inproceedings{Hahn2016FacultativeAM,
  title={Facultative Altitudinal Movements by Mountain White-Crowned Sparrows ( Zonotrichia leucophrys oriantha ) in the Sierra Nevada Author ( s ) :},
  author={Thomas P. Hahn and Keith W. Sockman and Creagh W. Breuner and Martin L. Morton},
  year={2016}
}
-Mountain White-crowned Sparrows (Zonotrichia leucophrys oriantha) winter in Mexico and often arrive in the vicinity of their breeding grounds in the Sierra Nevada well before nesting is possible. Arrival at Tioga Pass, Califomia (elevation 3,030 m), usually occurs in early May, but residual winter snow and adverse weather can delay nesting for weeks. We used radiotelemetry to determine whether prebreeding Mountain White-crowned Sparrows engaged in weather-related altitudinal movements during… CONTINUE READING
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