In the following we briefly analyze and compare voice of both races of Barred Fruiteater (Pipreola arcuata). 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).
Barred Fuiteater has two 'song-type vocalisations': a commonly heard fairly short overslurred high-pitched whistle, and a less common remarkably long whistle steadily increasing in pitch (the latter only documented for birds from S Ecuador to further south, I assume thus for both races).
arcuata (n=3) viridicauda (n=5)
start freq. 5500-6200Hz 5500-6000Hz
end freq. 8900-10100Hz 9000-9500Hz
length 5-5.5s 4-4.5s
There seems to be a small difference in length of the whistle (although a larger sample size would be needed to prove this is not a pure coincidence).
arcuata (n=5) viridicauda (n=5)
min. freq. 6000-8000Hz 6000-7000Hz
max. freq. 7500-10000Hz 8000-8500Hz
length 1.8-2.2s 2.0-2.5s
freq. range 1200-2000Hz 1900-2000Hz
There is considerable overlap in all basic parameters. Note shape is also quite variable for both races, without clear pattern. Apparently no diagnostic differences.
This note was finalized on 10th June 2015, using sound recordings available on-line at that moment. We would like to thank in particular the sound recordists who placed their recordings for this species on XC: Nick Athanas, Peter Boesman, Meena Haribal, Bennett Hennessey, Sebastian Herzog, Olaf Jahn, Niels Krabbe, Frank Lambert, Dan Lane, Mitch Leisinger, Sjoerd Mayer, John V Moore, Bob Planqué, Andrew Spencer, Joseph Tobias and Herman Van Oosten.
Tobias, J.A., Seddon, N., Spottiswoode, C.N., Pilgrim, J.D., Fishpool, L.D.C. & Collar, N.J. (2010). Quantitative criteria for species delimitation. Ibis 152(4): 724–746.
More Information: on110_barred_fruiteater.pdf