Lecture_15-1-1 - alarm calls! (TREE SWALLOW AND BARN OWL...

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Lecture 15 – Notes Avian Vocal Communication – 1 Communication – defined as the production of a signal by a sender that is received by a receiver and evokes a behavioral response. All of these aspects must be included for successful communication. Sometimes there are also encoding and decoding steps. What are the benefits of using sound for communication? (particularly in birds) Avian vocalizations grouped into two categories: Calls – brief sounds of simple acoustical structure made year-round and by both sexes Songs – complex sounds generally composed of 5 or more notes separated by pauses. Usually in the breeding season and by males only (although there are exceptions). A bird produces vocalizations in many situations: Before hatch – embryos make alarm calls, brooding vocalizations, contentment vocalizations, and hatching synchronization calls. (BOBWHITE EXAMPLE) Nestling stage – offspring make begging calls and negogiation calls. Usually no
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Unformatted text preview: alarm calls! (TREE SWALLOW AND BARN OWL EXAMPLES) Adult stage alarm calls, social context/maintaining contact/individual recognition vocalizations, dominance vocalizations, and song for attracting mates. (WHITE-BROWED SCRUBWREN & CHAFFINCH examples) How are vocalizations produced? Sound = alternating pressure of the medium (in this case, air) Sound is a wave function. Wavelength determined pitch. Pitch is often measured as frequency. Sound is produced by the syrinx. Human equivalent to the human larynx (avian voice box) Songbirds and Non-songbirds produce songs in different ways: 1.) Non-songbirds sound produced by vibrations of the tympaniform membranes and forcing air through passageways 2.) Songbirds Sound produced by induction of connective tissue into each end of the bronchus causing vibrations. Can produce song without tympaniform membrane....
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This note was uploaded on 04/08/2011 for the course POUL 3123 taught by Professor Navara during the Spring '09 term at University of Georgia Athens.

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Lecture_15-1-1 - alarm calls! (TREE SWALLOW AND BARN OWL...

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