Meeting Abstract

67-3   11:00 - 11:15  To sing in two ways: a ‘tail’ of converging forms of acoustic mating displays in the Anna’s hummingbird Calypte anna Berger, A*; Campbell, P; Clark, C; University of California, Riverside; University of California, Riverside; University of California, Riverside aberg009@ucr.edu

Male Anna's hummingbirds (Calypte anna) produce acoustic courtship signals mechanically with wing and tail feathers during a dive, and vocally with their syrinx. Anna’s hummingbird song is multi-syllabic and consists of three phrases whereas the dive-sounds are multisyllabic and consist of one phrase. Despite having an entirely different mechanism of production, part of the song (“dive-like song”) seems to acoustically resemble sounds of the dive displays. Both the dive-like song and the dive-sounds are complex and comprised of four syllables, consisting of trills, polyphonic sounds, and pure tones. We investigate to what degree there is a match between an individual’s dive-sounds and an individual’s dive-like songs. We elicited and audio-recorded dive-sounds and songs from twenty male Anna’s hummingbirds from one population (Riverside, CA). For each individual, we recorded twenty dive-sounds and twenty songs. Both dive-sounds and songs were elicited with a mount and a microphone was placed near the mount such that the bird’s position in relation to the microphone was standardized. We measured acoustic features of both signals, including peak frequency, trill-rate, and duration of syllables, and quantified the degree of temporal and frequency correspondence between dive-like songs and dive-sounds within an individual as compared to the population. Results from this study will provide insight into signal evolution and the development of complex displays.