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Vocalizations and associated behaviors of the sombre hummingbird (Aphantochroa cirrhochloris) and the rufous-breasted hermit (Glaucis hirsutus)

Lookup NU author(s): Dr Tom Smulders

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Abstract

Vocal behavior in tropical hummingbirds is a new area of study. Here, we present findings on the vocalizations and associated behaviors of two species: Sombre Hummingbird (Aphantochroa cirrhochloris) and Rufous-breasted Hermit (Glaucis hirsutus). These are the only hummingbirds in which the brain areas activated by singing have been demonstrated. They are also among the basal species of their respective subfamilies, Trochilinae and Phaethornithinae and, thus, represent early stages in the evolution of hummingbird vocal communication. We found that the two species exhibit distinctive vocalizations and behaviors. Sombre Hummingbird calls had more modulation and were often used during agonistic interactions, whereas Rufous-breasted Hermit calls had higher pitch and purer tones and were produced in less aggressive interactions. Sombre Hummingbird song was highly stereotyped in syllable structure and syntax, whereas Rufous-breasted Hermit song was highly variable. Comparative analysis points to consistent similarities in use of vocalizations by the Sombre Hummingbird and other trochilines, and by the Rufous-breasted Hermit and other phaethornithines. We hypothesize that differences in vocal behavior between hummingbird lineages arise as adaptations to their foraging strategies. © The American Ornithologists' Union, 2006.


Publication metadata

Author(s): Ferreira ARJ, Smulders TV, Sameshima K, Mello CV, Jarvis ED

Publication type: Article

Publication status: Published

Journal: Auk

Year: 2006

Volume: 123

Issue: 4

Pages: 1129-1148

ISSN (print): 0004-8038

ISSN (electronic): 1938-4254

Publisher: University of California Press

URL: http://dx.doi.org/10.1642/0004-8038(2006)123[1129:VAABOT]2.0.CO;2

DOI: 10.1642/0004-8038(2006)123[1129:VAABOT]2.0.CO;2


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