J. Carib. Ornithol. 23:4–18, 2010 GEOGRAPHIC VARIATION IN THE FLIGHT CALL OF THE CUBAN PARROT ( AMAZONA LEUCOCEPHALA ) AND ITS TAXONOMIC RELEVANCE M. B RYANT J. R EYNOLDS 1,2 , WILLIAM K. H AYES 1,3 , AND JAMES W. W ILEY 4 1Department of Earth and Biological Sciences, Loma Linda University, Loma Linda, CA 92350 USA; 2Current address: 4927 Calle del Cajon, Las Vegas, NV 89120, USA; e-mail:
[email protected]; 3e-mail:
[email protected]; 4Western Foundation of Vertebrate Zoology, PO Box 64, Marion Station, MD 21838 USA; e-mail:
[email protected] Abstract: Because bird vocalizations often reflect population differentiation and can create barriers to gene flow, ornithologists frequently rely on vocalizations for defining species limits. Our previous work on morphology and plumage variation within the Cuban Parrot ( Amazona leucocephala ) suggested greater diversity than previously recognized. Because some island populations are highly endangered, additional characters are needed to help define taxonomic units within this group. Here, we tested two hypotheses: that the flight call (a form of contact call) of parrots from each of the six extant island populations is diagnosably distinct, and that the structure of the call, as assessed by discriminant function analysis, corresponds to variation in molecular, morphological, and plumage char- acters (i.e., character concordance). To test these hypotheses, we spectrographically examined both qualitative and quantitative characters of the flight call of 23 individuals recorded from the six extant island populations on Abaco and Inagua (the Bahamas), Cuba, Isla de la Juventud, Cayman Brac, and Grand Cayman. As anticipated, we found the flight call of each population to be diagnosably distinct.