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Long term changes of song within individual passerine populations
Žabková, Michaela ; Petrusková, Tereza (advisor) ; Turčoková, Lucia (referee)
Song is a very important means of communication among passerines - it is species- specific, and they use it to communicate with other members of the same species, but also in interspecific recognition. However, the song differs not only between species but also between conspecifics or conspecific populations, both in space and time. In contrast to groups with congenital vocalisation, i.e. all other bird taxa with exception of hummingbirds and parrots, passerines learn their song during the life. In some species, i.e. open-ended learners, song can change throughout the life. Nevertheless, learning is not the only cause of the origin of spatiotemporal variability. This review is about changes in the song of the individuals as well as within the population of various species of passerines. Song variability can be caused by the changing environment in the surrounding area of the observed populations or ongoing social interaction among the individuals. The individual song stability is more common among species, that are closed-ended learners. Within populations song stability is rather rare.
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