SEASONALLY CHANGING BIRD CALL - THE TRILL CALL OF MALE SHELDUCKS (TADORNA-TADORNA)

Autor(en): TIMCKE, A
BERGMANN, HH
Stichwörter: Ornithology; Zoology
Erscheinungsdatum: 1994
Herausgeber: DEUTSCHE ORNITHOLOGIE-GESELL
Journal: JOURNAL FUR ORNITHOLOGIE
Volumen: 135
Ausgabe: 1
Startseite: 95
Seitenende: 100
Zusammenfassung: 
Both syntactic and phonetic features of the trill call accompanying whistle-shake in adult male Shelducks are subject to cyclic annual changes. In the course of spring, the duration of the whole call increases gradually. This is caused by a prolongation of the first call element and insertion of additive elements in the final phrase. In contrast the second element is shortened by about 10 ms. At the same time, the pitch of all measured elements is raised. These findings are discussed in the framework of hormonal regulation and communicative function.
ISSN: 00218375
DOI: 10.1007/BF01640278

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