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1 April 2002 GEOGRAPHIC VARIATION AND DIALECTS IN SONGS OF THE BRONZED COWBIRD (MOLOTHRUS AENEUS)
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Abstract

Vocal dialects have presented a puzzle for evolutionary biologists for nearly 50 years. However, there is still a dearth of detailed description of variation in species with dialects, especially regarding acoustic characteristics that discriminate among dialects. In this study, I show that dialects occur in the “flight whistle” song type of the Bronzed Cowbird (Molothrus aeneus). Dialects in this species occur at a very large scale, spanning hundreds of kilometers. A discriminant function analysis revealed that the initial element of the song shows greater differences among dialects than a major element in the final portion of the song. This quantitative analysis of the dialect system provides the basis for understanding how Bronzed Cowbirds recognize songs from different dialects.

Paige S. Warren "GEOGRAPHIC VARIATION AND DIALECTS IN SONGS OF THE BRONZED COWBIRD (MOLOTHRUS AENEUS)," The Auk 119(2), 349-361, (1 April 2002). https://doi.org/10.1642/0004-8038(2002)119[0349:GVADIS]2.0.CO;2
Received: 7 March 2001; Accepted: 12 December 2001; Published: 1 April 2002
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