Summary
The structure of Hoopoe (Upupa epops) song is analysed in a colour ringed population in southern Spain. The song of males in this species is very simple, with a repertoire size of one. The strophes of a male only differ in the number of elements that they include (strophe length), and strophe length is the main song feature differing between males. During the prelaying period each individual used mainly strophes of only two lengths, between 2 and 6 elements per strophe, and mean strophe length of males during this period was highly repeatable. However, some males changed the range of strophe types produced and decreased their mean strophe length after unsuccessful breeding or spending long periods of time singing (unpaired males). These changes show that strophe length is phenotypically plastic, and suggest that singing long strophes is energetically more costly than singing short ones. The significant relationship between strophe length and body condition, and the fact that long strophes were associated with longer previous pauses than short strophes, also suggest that increasing strophe length is costly. All these findings are in accordance with the hypothesis that strophe length reflects male condition in the Hoopoe, although it is not clear what the actual cost of singing long strophes is.
Zusammenfassung
Die Struktur des Gesangs des Wiedehopfs wurde in einer farbberingten südspanischen Population untersucht. Der Gesang des Männchens ist sehr einfach und umfaßt nur ein Repertoire. Die Strophen eines Männchens differieren nur in der Anzahl Elemente (Strophenlänge), und die Männchen unterscheiden sich vor allem in der Strophenlänge voneinander. In der Vorbrutphase verwendeten die Männchen meist nur zwei verschieden lange Strophen, bestehend aus 2 und 6 Elementen je Strophe, und die durchschnittliche Strophenlänge war in dieser Phase sehr konstant. Nach Brutverlust oder bei kontinuierlich singenden, ledigen Männchen kam es zu einer Verkürzung der mittleren Strophenlänge. Die Strophenlänge ist phänotypisch plastisch, und lange Strophen zu singen scheint energetisch aufwendiger als kurze Strophen. Der enge Zusammenhang zwischen Strophenlänge und männlicher Konstitution einerseits und die Beobachtung, daß lange Strophen mit langen Pausen korrelieren andererseits, zeigen ebenfalls, daß längere Strophen energetisch aufwendiger sind. Die wirklichen Kosten dafür sind jedoch noch nicht bekannt.
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Martín-Vivaldi, M., Palomino, J.J. & Soler, M. Song structure in the Hoopoe (Upupa epops) — Strophe length reflects male condition. J Ornithol 139, 287–296 (1998). https://doi.org/10.1007/BF01653339
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DOI: https://doi.org/10.1007/BF01653339