A Performance Constraint on the Evolution of Trilled Vocalizations in a Songbird Family (passeriformes: Emberizidae).

@article{Podos1997APC,
  title={A Performance Constraint on the Evolution of Trilled Vocalizations in a Songbird Family (passeriformes: Emberizidae).},
  author={Jeffrey Podos},
  journal={Evolution; international journal of organic evolution},
  year={1997},
  volume={51 2},
  pages={537-551}
}
Behavioral evolution can be influenced by constraints, for example, of phylogeny and performance. In this paper I describe a pattern in the evolution of birdsongs that may reflect a constraint on vocal performance. Trilled vocalizations from 34 species of songbirds (Passeriformes: Emberizidae) were analyzed. Two acoustic variables, trill rate and frequency bandwidth, were measured for different trill types. In most species, maximal values of frequency bandwidth were found to decrease with… CONTINUE READING
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