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Behavioral Ecology and Sociobiology

, Volume 48, Issue 5, pp 358–363 | Cite as

Song type variants and aggressive context

  • W. A. Searcy
  • S. Nowicki
  • C. Hogan
Original Article

Abstract 

We asked whether switching among song type variants functions as a graded signal of aggression in song sparrows (Melospiza melodia). Song type variants are different versions of a given song type and are defined by much smaller acoustic differences than those defining separate song types. The principal evidence that switching between song types functions as an aggressive signal, in song sparrows and other species, is that song type switching frequencies increase during aggressive contexts, for example during simulated territorial intrusions. We tested whether variant switching frequencies change in the same way, using playback of conspecific song to simulate intrusions. Male song sparrows showed a significant increase in variant switching frequencies during intrusion relative to before intrusion. After intrusions, variant switching frequencies returned to pre-intrusion levels. These results are consistent with the hypothesis that variant switching is a graded aggressive signal, but other interpretations are possible, for example, that variant switching is a signal of submission or represents simple production error.

Keywords Song sparrows Melospiza melodia Song variation 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • W. A. Searcy
    • 1
  • S. Nowicki
    • 2
  • C. Hogan
    • 3
  1. 1.Department of Biology, University of Miami, Coral Gables, FL 33124, USA e-mail: wsearcy@miami.edu Tel.: +1-305-2842065, Fax: +1-305-2843039US
  2. 2.Department of Biology, Duke University, Durham, NC 27708, USAUS
  3. 3.Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USAUS

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