Presentation Details
| What's it all for? Lessons about complex vocal repertoires from 10 years studying Bachman's sparrow Rindy Anderson1, Heather Wolverton1, Hans Gonzembach1, Jill Soha2. 1Florida Atlantic University, Davie, FL, USA.2Duke University, Durham, NC, USA |
Abstract
Understanding the evolution of complexity in animal communication remains a central challenge in behavioral ecology. We are addressing this question in Bachman’s sparrow, a new world sparrow with an unusually large repertoire. Males produce ~48 broadcast “primary” song types, quieter “whisper” versions, and a distinct, highly variable “complex song.” Our field data show extensive repertoire sharing (49% overlap between males in our population) and shared preferred song transitions, with both types of sharing independent of territory distance. Playback experiments demonstrate that complex songs function in male–male aggression and elicit the strongest territorial responses. Although complex songs vary across renditions, they are more similar within than among individuals, suggesting a role in individual identification. Complex song performance and diversity also correlate with male quality. In our laboratory rearing experiment, preferred transitions were not learned from tutors and complex songs were not produced. Together, these findings provide a foundation for testing how selection shapes the structure, function, and development of a complex communication system.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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