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Discrete Variants of Evening Grosbeak Flight Calls

Kendra Sewall, Rodd Kelsey and Thomas P. Hahn
The Condor
Vol. 106, No. 1 (Feb., 2004), pp. 161-165
Stable URL: http://www.jstor.org/stable/1370527
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Discrete Variants of Evening Grosbeak Flight Calls
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Abstract

We describe four discrete variants of the frequency-modulated flight calls of Evening Grosbeaks (Coccothraustes vespertinus) in the United States and southwestern Canada. Each call type is aurally and spectrographically distinct, and individual birds appear to produce only one call type. The observed geographic distributions of these call types are roughly concordant with described subspecies ranges. The long-term geographic distribution patterns of these vocal forms, and of genetic, morphological, and plumage correlates of vocalizations, warrant further study. /// Describimos cuatro variantes discretas de las llamadas de vuelo de frecuencia modulada de Coccothraustes vespertinus en los Estados Unidos y el sudoeste de Canadá. Cada tipo de llamada es auditiva y espectrográficamente distintivo, y un individuo dado parece emitir sólo uno de ellos. La distribución geográfica observada de estos tipos de llamadas concuerda de manera general con las distribuciones de las subespecies. Es necesario hacer más estudios sobre los patrones de distribución geográfica a largo plazo de estas formas vocales, y sobre qué caracteres genéticos, morfológicos y de plumaje se correlacionan con las vocalizaciones.

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