Abstract.
Unmated male songbirds usually change their vocal behaviour when females enter their territories. Either the males court the females by changing the rate or pattern with which their normal long-ranging full songs are emitted, or they shift to special displays and long- or short-ranging vocalisations. In this study we quantified how female presence and behaviour affect the singing behaviour of male whitethroats. In the presence of a female the male frequently performed song flights, maybe to locate the female before it was courted, with sequences of diving-song displays. The courtship was interrupted by periods of perch songs. Female dscharp calls and short movements made the males initiate or resume courtship, whereas short horizontal jumps made the males intensify their courtship. Overall, the males changed their dual-function song activity in females' presence by emitting fewer perch songs and more flight songs. The quiet diving songs were only emitted during direct courtship of a female. The song types emitted immediately before, during, and after courtship are all highly variable, thus allowing for a quick assessment of the male's song repertoire. The courtship was also interrupted by periods of male woid calling, a call that is known to have a deterring effect on rival males. Bouts of woid calls were usually followed by song flights, again probably to locate the female that might have moved out of sight, or maybe to locate potential rival intruders. The latter was supported by an increased intrusion rate during female presence.
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Acknowledgements.
We thank Mols laboratoriet and Fussingø Statsskovsdistrikt skovpart Mols for permitting us to work in the area. The Danish Ringing Centre, Zoological Museum, Copenhagen administered the ringing license to TJSB. Centre for Sound Communication and Poul Hansen at the Natural History Museum Århus assisted us with equipment. Peter McGregor, Marc Naguib, Stephen Nowicki, Bill Searcy and an anonymous referee gave valuable comments on earlier versions of the manuscript. TJSB was funded by a Ph.D. scholarship from Copenhagen University. This study complies with the laws in Denmark.
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Balsby, T.J.S., Dabelsteen, T. Male singing behaviour and female presence in the territory in whitethroats Sylvia communis. acta ethol 5, 81–88 (2003). https://doi.org/10.1007/s10211-002-0068-z
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DOI: https://doi.org/10.1007/s10211-002-0068-z