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The Effects Of Parental Species On Aberrant Playback

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While parental species responded more to conspecific songs than heterospecific songs, we found no difference in the responses of parental species to aberrant playback. A previously mentioned study of two closely related species of African doves found that birds showed more response to conspecific vocalizations than to heterospecific playback, and found that response to hybrid vocalizations was intermediate (den Hartog et al. 2007). While our results aren’t statistically significant for intermediate response, the trends do suggest that parental species respond with more vocalizations, and approach the speaker closer to conspecific vocalizations. With a marginally significant result for BCCH responding with more vocalizations to BCCH song…show more content…
He found that responses of allopatric birds were determined by syllabic cues and not by the temporal pattern of the song (Baker 1991). As these aberrant chickadee vocalizations may contain characteristics of both parental song types (Enstrom and Bollinger 2009), we would expect some type of response from, for example, a BCCH if an aberrant vocalization contained BCCH-like elements (e.g. slower song frequency, lower pitch interval, lower number of notes per song, etc.). It is possible that response from parental species to these aberrant vocalizations also varies based on the structure of the song being presented. The majority of the aberrant song types recorded in Illinois contain introductory phrases that are similar to typical BCCH song. Perhaps most notably, the Greenville dialect starts with a two-note phrase that is similar in frequency to a typical BCCH song (Enstrom and Bollinger 2009). However, the phrase duration is shorter and more similar to a typical CACH song. With aberrant vocalizations containing elements of both parental song types, a parental bird could be responding to a particular phrase or other element within the song which elicits a response similar to a true conspecific song. Further investigation would be necessary to compare responses from partial songs or from playbacks that have been manipulated to express different song characteristics.
As expected, our results indicate that
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