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A in identifying the functions of a particular bird species' song is to examine
 

Summary: A in identifying the functions
of a particular bird species' song is to examine
the relationship between time of day or season
and amount of singing (Hutchinson et al. 1993,
Catchpole and Slater 1995). Numerous studies
have correlated singing activity with the peri-
ods of the females' breeding cycle (reviewed in
Møller 1991 and Gil et al. 1999). In recent years,
much a ention has been focused on male song
when females are fertile. An elevated sing-
ing activity during that period is commonly
interpreted to function in sperm competition
(Møller 1991), to a ract additional social mates
(Hasselquist and Bensch 1991), or to stimulate
or encourage the mate (Pinxten and Eens 1998,
Amrhein et al. 2002). Several authors did not
find a peak of song during the fertile period
(Pärt 1991, Gil et al. 1999) and questioned in
particular the sperm competition hypothesis.
However, the results of the different studies

  

Source: Amrhein, Valentin - Zoologisches Institut, Universität Basel

 

Collections: Environmental Sciences and Ecology