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ORIGINAL ARTICLE Long-term influence of simulated territorial intrusions on dawn

Long-term influence of simulated territorial intrusions on dawn
and dusk singing in the Winter Wren: spring versus autumn
Nathaline Erne ∆ Valentin Amrhein
Received: 9 November 2007 / Accepted: 29 January 2008 / Published online: 4 March 2008
” Dt. Ornithologen-Gesellschaft e.V. 2008
Abstract Males of many songbird species have peaks of
singing activity at dawn and dusk. Singing during those
twilight periods can function in territory proclamation, and
males are suggested to adjust song output to the level of
intruder pressure. We used song playback during the
breeding season to simulate intrusions into territories of
male Winter Wrens (Troglodytes troglodytes) shortly after
dawn. We then compared male singing behaviour during
the dawn and dusk chorus before and 1 day after the sim-
ulated intrusion. One day after the playback, male Wrens
increased their song output before sunrise, which confirms
our results from a previous study on dawn singing in
autumn territories. At dusk, on the evening following the
playback, males slightly increased song output after sunset,


Source: Amrhein, Valentin - Zoologisches Institut, Universitšt Basel


Collections: Environmental Sciences and Ecology