142. Notes on the vocalizations of Streaked Flycatcher (Myiodynastes maculatus)

Peter F. D. Boesman
2016 Ornithological Notes  
In the following we briefly analyze and compare voice of the different races of xxxx. We also try to quantify the extent of any vocal differences using the criteria proposed by Tobias et al. (2010) , as a support for taxonomic review. We have made use of sound recordings available on-line from Xeno Canto (XC) and Macaulay Library (ML). Dawn song With respect to dawn song, there are two groups which clearly differ. We have examined all available dawn-songs to see which taxa belong to which
more » ... long to which group. Group 1: dawn song with high-pitched rising end note Dawn song is remarkably similar over its entire range: a first upslurred note which starts at fairly high frequency, a high-pitched overslurred note, a low-pitched underslurred note, a high-pitched down-slurred note and a rising note with bend at high pitch. The following races have this dawn song type: M. m. insolens no recordings M. m. difficilis 3 recordings from Panama and W Venezuela M. m. nobilis 1 recording presumably of this taxon from Santander, Colombia. M. m. tobagensis 2 recordings from Bolivar, Venezuela and Guyana M. m. chapmani 5 recordings from W Ecuador and NW Peru M. m. maculatus no recordings Measurements: total length 0.67-0.85s min.freq. first note 1300-2300Hz (typically around 1900Hz) bend freq. last note 3100-3700Hz Group 2: dawn song with low-pitched end note Dawn song over its entire range is a first upslurred note which starts at fairly low frequency, a short low-pitched overslurred note, a long high-pitched overslurred note, a high-pitched down-slurred note and a rising note with bend at low pitch.
doi:10.2173/bow-on.100142 fatcat:3hjbpfedqzh4dcewmpbhimr67u